REFRACTORY MATERIAL WITH FUNCTION OF CLEANING MOLTEN STEEL, PREPARATION METHOD THEREFOR AND USE THEREOF

Abstract

The present application discloses a refractory material with the function of cleaning molten steel, a preparation method therefor and the use thereof. The material phase of the refractory material of the present application comprises one or more of CA6, CMA, corundum and ZrO.sub.2. The refractory material prepared by the present application has a high purity, good erosion resistance, good slag permeability resistance and high thermal shock stability, reduces the amount of refractory material eroded into molten steel, reduces the pollution of the molten steel, and can also give full play to the performance advantages of high-purity raw materials.

Claims

1. A refractory material with the function of cleaning molten steel, wherein the phase of the refractory material comprises one or two or more selected from the group consisting of: CA6, CMA, corundum and ZrO.sub.2.

2. The refractory material according to claim 1, wherein based on the percentage of the total mass of the refractory material, the total phase content of CA6, CMA, corundum and ZrO in the refractory material is ?90%; wherein the phase content of CA6 is 0-100%; the phase content of CMA is 0-100%; the phase content of ZrO.sub.2 is 0-35%, preferably 0-15%; the phase content of corundum is 0-70%, preferably 0-30%; preferably based on the percentage of the total mass of the refractory material, the total phase content of CA6 and CMA in the refractory material is 30-100%, preferably 55-100%, or 52.5-100%; more preferably based on the percentage of the total mass of the refractory material, the phase content of CA6 in the refractory material is 30-100%, preferably 52.5-100%, or 55-100%.

3. The refractory material according to claim 1, wherein based on the percentage of the total mass of the refractory material, the content of the sintering-promoting component in the refractory material is ?1.5%, preferably 0%.

4. The refractory material according to claim 1, wherein based on the percentage of the total mass of the refractory material, the chemical composition of the refractory material comprises: 53.20-97.13% or 55.72-97.48% of Al.sub.2O.sub.3, preferably 71.06-94.10% or 72.86-94.12% of Al.sub.2O.sub.3, more preferably 75.58-94.10% of Al.sub.2O.sub.3; 1.60-8.40% or 1.76-8.4% of CaO, preferably 3.05-8.40% or 3.2-8.4% of CaO, more preferably 4.16-8.40% of CaO; 0-8.4% of MgO, preferably 0-6.72% of MgO; and 0-35% of ZrO.sub.2, preferably 0-15% of ZrO.sub.2; preferably the bulk density of the refractory material is 2.90-3.65 g/cm.sup.3, preferably 2.95-3.35 g/cm.sup.3.

5. (canceled)

6. The refractory material according to claim 1, wherein the phase of the matrix part of the refractory material comprises one or two or more of corundum, CA6, CMA and ZrO.sub.2; based on the percentage of the total mass of the matrix part of the refractory material, in the matrix part the phase content of the corundum is 0-100%, preferably 0-50%; the phase content of CA6 is 0-100%; the phase content of CMA is 0-100%; the phase content of ZrO.sub.2 is 0-50%, preferably 0-25%; preferably based on the percentage of the total mass of the matrix part of the refractory material, the total phase content of CA6 and CMA in the matrix part is 25-100%; more preferably based on the percentage of the total mass of the matrix part of the refractory material, the phase content of CA6 in the matrix part is 25-100%.

7. The refractory material according to claim 1, wherein based on the percentage of the total mass of the matrix part of the refractory material, the chemical composition of the matrix part of the refractory material comprises: 41.2-99.5% or 42.5-100% of Al.sub.2O.sub.3, preferably 63.15-95.80% or 64.29-95.8% of Al.sub.2O.sub.3; more preferably 67.46-95.80% of Al.sub.2O.sub.3; 0-8.4% of CaO, preferably 1.35-8.40% or 1.47-8.4% of CaO, more preferably 2.0-8.40% of CaO; 0-8.4% of MgO, preferably 0-6.72% of MgO; and 0-50% of ZrO.sub.2, preferably 0-25% of ZrO.sub.2.

8. The refractory material according to claim 1, wherein it is prepared by a method comprising the following steps: mixing a granular material and a fine powder to obtain a mixed material, then subjecting the mixed material to hot-pressed sintering to obtain the refractory material; preferably the mass ratio of the granular material to the fine powder is 30-65:35-70; preferably 40-65:35-60; preferably the granular material is one or two selected from CA6 granular material and CMA granular material.

9. (canceled)

10. (canceled)

11. The refractory material according to claim 8, wherein the fine powder comprises Al.sub.2O.sub.3CaOMgO system fine powder; preferably the fine powder further comprises ZrO.sub.2-containing fine powder; preferably based on the percentage of the total mass of the fine powder, the fine powder comprises: 50-100% of Al.sub.2O.sub.3CaOMgO system fine powder, and 0-50% of ZrO.sub.2-containing fine powder; preferably the fine powder comprises: 75-100% of Al.sub.2O.sub.3CaOMgO system fine powder, and 0-25% of ZrO.sub.2-containing fine powder; preferably the Al.sub.2O.sub.3CaOMgO system fine powder is one or two or more selected from the group consisting of: CA6 fine powder, CMA fine powder, Al.sub.2O.sub.3-containing fine powder, a mixed powder of Al.sub.2O.sub.3-containing fine powder and CaO-containing fine powder, and a mixed powder of Al.sub.2O.sub.3-containing fine powder, CaO-containing fine powder and MgO-containing fine powder; preferably the Al.sub.2O.sub.3-containing fine powder is one or two or more selected from the group consisting of: active ?-Al.sub.2O.sub.3 fine powder, ?-Al.sub.2O.sub.3 fine powder, ?-Al.sub.2O.sub.3 fine powder, aluminum hydroxide fine powder, industrial alumina fine powder, white corundum fine powder, sintered corundum fine powder, and tabular corundum fine powder; preferably the MgO-containing fine powder is one or two or more selected from the group consisting of: magnesium carbonate fine powder, light-calcined magnesia fine powder, brucite fine powder, magnesium hydroxide fine powder, magnesium chloride fine powder, sintered magnesia fine powder, and fused magnesia fine powder; preferably the CaO-containing fine powder is one or two or more selected from the group consisting of: quicklime fine powder, limestone fine powder, calcium hydroxide fine powder, CaO.Math.Al.sub.2O.sub.3 fine powder, CaO.Math.2Al.sub.2O.sub.3 fine powder, and 12CaO.Math.7Al.sub.2O.sub.3 fine powder; preferably the ZrO.sub.2-containing fine powder is one or two or more selected from the group consisting of: monoclinic zirconia fine powder, tetragonal zirconia fine powder, desiliconized zirconium fine powder, and fused zirconia fine powder.

12. The refractory material according to claim 8, wherein the particle size of the fine powder is less than 0.088 mm, and the particle size of the granular material is 0.088-10 mm.

13. The refractory material according to claim 8, wherein the hot-pressed sintering is performed by putting the mixed material into a mold of a high temperature device for hot-pressed sintering; or molding the mixed material at normal temperature, and then putting it into a mold of a high temperature device for hot-pressed sintering; or molding the mixed material at normal temperature, and sintering it at low temperature, and then putting it into a mold of a high temperature device for hot-pressed sintering; preferably the temperature of the hot-pressed sintering is 1550-1800? C.; preferably the pressure of the hot-pressed sintering is 0.5-30 MPa.

14. (canceled)

15. The refractory material according to claim 8, wherein based on the percentage of the total mass of the granular material, the total content of CaO, Al.sub.2O.sub.3 and MgO in the chemical composition of the granular material is ?97.5%, and the bulk density of the granular material is ?2.90 g/cm.sup.3.

16. A preparation method for refractory material, comprising the following steps: mixing a granular material and a fine powder to obtain a mixed material, then subjecting the mixed material to hot-pressed sintering to obtain the refractory material.

17. The preparation method according to claim 16, wherein the mass ratio of the granular material to the fine powder is 30-65:35-70, preferably 40-65:35-60.

18. The preparation method according to claim 16, wherein the granular material is one or two selected from CA6 granular material and CMA granular material.

19. The preparation method according to claim 16, wherein the fine powder comprises Al.sub.2O.sub.3CaOMgO system fine powder; preferably the fine powder further comprises ZrO.sub.2-containing fine powder; preferably based on the percentage of the total mass of the fine powder, the fine powder comprises: 50-100% of Al.sub.2O.sub.3CaOMgO system fine powder, and 0-50% of ZrO.sub.2-containing fine powder; preferably the fine powder comprises: 75-100% of Al.sub.2O.sub.3CaOMgO system fine powder, and 0-25% of ZrO.sub.2-containing fine powder; preferably the Al.sub.2O.sub.3CaOMgO system fine powder is one or two or more selected from the group consisting of: CA6 fine powder, CMA fine powder, Al.sub.2O.sub.3-containing fine powder, a mixed powder of Al.sub.2O.sub.3-containing fine powder and CaO-containing fine powder, and a mixed powder of Al.sub.2O.sub.3-containing fine powder, CaO-containing fine powder and MgO-containing fine powder; preferably the Al.sub.2O.sub.3-containing fine powder is one or two or more selected from the group consisting of: active ?-Al.sub.2O.sub.3 fine powder, ?-Al.sub.2O.sub.3 fine powder, ?-Al.sub.2O.sub.3 fine powder, aluminum hydroxide fine powder, industrial alumina fine powder, white corundum fine powder, sintered corundum fine powder, and tabular corundum fine powder; preferably the MgO-containing fine powder is one or two or more selected from the group consisting of: magnesium carbonate fine powder, light-calcined magnesia fine powder, brucite fine powder, magnesium hydroxide fine powder, magnesium chloride fine powder, sintered magnesia fine powder, and fused magnesia fine powder; preferably the CaO-containing fine powder is one or two or more selected from the group consisting of: quicklime fine powder, limestone fine powder, calcium hydroxide fine powder, CaO.Math.Al.sub.2O.sub.3 fine powder, CaO.Math.2Al.sub.2O.sub.3 fine powder, and 12CaO.Math.7Al.sub.2O.sub.3 fine powder; preferably the ZrO.sub.2-containing fine powder is one or two or more selected from the group consisting of: monoclinic zirconia fine powder, tetragonal zirconia fine powder, desiliconized zirconium fine powder, and fused zirconia fine powder.

20. The preparation method according to claim 16, wherein the particle size of the fine powder is less than 0.088 mm, and the particle size of the granular material is 0.088-10 mm.

21. The preparation method according to claim 16, wherein the hot-pressed sintering is performed by putting the mixed material into a mold of a high temperature device for hot-pressed sintering; or molding the mixed material at normal temperature, and then putting it into a mold of a high temperature device for hot-pressed sintering; or molding the mixed material at normal temperature, and sintering it at low temperature, and then putting it into a mold of a high temperature device for hot-pressed sintering.

22. The preparation method according to claim 16, wherein the temperature of the hot-pressed sintering is 1550-1800? C.; preferably the pressure of the hot-pressed sintering is 0.5-30 MPa.

23. The preparation method according to claim 16, wherein based on the percentage of the total mass of the granular material, the total content of CaO, Al.sub.2O.sub.3 and MgO in the chemical composition of the granular material is ?97.5%, and the bulk density of the granular material is ?2.90 g/cm.sup.3.

24. A working lining of a ladle for molten steel smelting, or working lining for molten aluminum smelting and transporting ladles or refractory lining for industrial furnaces, wherein it comprises the refractory material according to claim 1, or t a refractory material prepared by a preparation method comprising mixing a granular material and a fine powder to obtain a mixed material, then subjecting the mixed material to hot-pressed sintering to obtain the refractory material.

25. (canceled)

26. (canceled)

Description

BRIEF DESCRIPTION OF DRAWINGS

[0099] FIG. 1 is a schematic diagram of molten steel smelting in a crucible prepared in Example 1 of the present application.

[0100] FIG. 2 shows the structure of the interface formed between the Example of the application and the slag.

DETAILED DESCRIPTION OF THE INVENTION

[0101] The present application is described in detail below in connection with the embodiments described in the accompanying drawings, wherein the same numbers in all the drawings indicate the same features. Although specific embodiments of the present application are shown in the drawings, it should be understood that it can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for thoroughly understanding of the present application and fully conveying the scope of the present application to those skilled in the field.

[0102] It should be noted that certain terms are used in the specification and claims to refer to particular components. It should be understood by those skilled in the art that they may use different terms to refer to the same element. The specification and claims do not use differences in nouns as a way of distinguishing components, but use differences in the function of components as a criterion for distinguishing. As mentioned throughout the specification and claims, comprises or includes are open-ended terms and should therefore be interpreted as including but not limited to. The specification subsequently is preferred embodiments for implementing the application. However, the description is intended as a general specification principle of the specification and is not intended to limit the scope of the application. The scope of protection of this application should be defined by the appended claims.

[0103] The present application provides a refractory material with the function of cleaning molten steel, the phase of the refractory material comprises one or two or more selected from the group consisting of: CA6, CMA, corundum, and ZrO.sub.2.

[0104] In one specific embodiment, the phase of said refractory material consists of one or two or more of CA6, CMA, corundum, and ZrO.sub.2.

[0105] In a specific embodiment, the phase of the refractory material further comprises MA.

[0106] In this application, CA6 is the abbreviation of calcium hexaaluminate, its structural formula is CaO.Math.6Al.sub.2O.sub.3, its melting point is 1875? C., and the theoretical density is 3.79 g/cm.sup.3. The characteristics of this material are: good stability at low oxygen partial pressure; lamellar stacking structure, crystal growth anisotropy, the slow growth rate in the C-axis and difficult to sinter. When reacting with slag, CA2 (abbreviation of CaO.Math.2Al.sub.2O.sub.3) and CA (abbreviation of CaO.Math.Al.sub.2O.sub.3) are generated. CA2 is a solid phase, and CA is a liquid phase at steelmaking temperature. The solid-liquid mixed phase blocks the pores and inhibits slag penetration.

[0107] In this application, MA is the abbreviation of MgO.Math.Al.sub.2O.sub.3; in this application, C2M2A14 is the abbreviation of 2CaO.Math.2MgO.Math.14Al.sub.2O.sub.3; in this application, CM2A8 is the abbreviation of CaO.Math.2MgO.Math.8Al.sub.2O.sub.3; in this application, CMA is the collective name of C2M2A14 and CM2A8. Both C2M2A14 and CM2A8 are based on stacking CA6 structural units with MA in the C-axis, which is similar to CA6.

[0108] In this application, a phase is a phase of a substance that has specific physicochemical properties.

[0109] The phases of the refractory material are determined by XRD, for example, by grinding the material to below 325 mesh and then scanning it using an X-ray diffractometer. The diffraction data are analyzed and matched to a standard PDF card to obtain the relevant phases, which are then fitted to the diffraction data to obtain the content of the relevant phases.

[0110] Regarding the ZrO.sub.2 phase, since H.sub.fO.sub.2 is symbiotic with ZrO.sub.2, it is difficult to separate, and the crystal forms are similar. Therefore, the following explanation is made. [0111] 1) The H.sub.fO.sub.2 phase is included in ZrO.sub.2; [0112] 2) Due to different temperatures and processes, and uneven distribution of the composition (it is impossible to achieve absolute uniformity), phases such as ZrO.sub.2CaO solid solution, ZrO.sub.2MgO solid solution, CaO.Math.ZrO.sub.2, MgO.Math.ZrO.sub.2, etc. may appear in the final product. In the case of the appearance of ZrO.sub.2CaO solid solution, ZrO.sub.2MgO solid solution, CaO.Math.ZrO.sub.2, MgO.Math.ZrO.sub.2, etc., the ZrO.sub.2 content is firstly corrected by combining the XRF results, and then this ZrO.sub.2 content is converted to a zirconia phase, converting CaO, MgO, etc. that have been solidly soluble or bound in the form of CaO.Math.ZrO.sub.2, MgO.Math.ZrO.sub.2, etc. into CA6 and CMA (this CaO and MgO content is first converted into CA6 and MA, and then into CA6 and CMA according to temperature or CaOMgOAl.sub.2O.sub.3 system composition, etc.), then normalizing all these phases to 100%, and calculating the percentage of each phase.

[0113] Regarding the content of ZrO.sub.2 in the chemical composition, the H.sub.fO.sub.2 content is counted in the ZrO.sub.2 content in the XRF of this application because H.sub.fO.sub.2 is symbiotic with ZrO.sub.2 and is difficult to separate.

[0114] In a specific embodiment, the refractory material of this application, wherein based on the percentage of the total mass of the refractory material, the total phase content of CA6, CMA, corundum and ZrO in the refractory material is ?90%; for example, it may be 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, etc.

[0115] In a preferred embodiment, the refractory material of this application, based on the percentage of the total mass of the refractory material [0116] the phase content of CA6 is 0-100%; [0117] the phase content of CMA is 0-100%; [0118] the phase content of ZrO.sub.2 is 0-35%, preferably 0-15%; [0119] the phase content of corundum is 0-70%, preferably 0-30%; [0120] for example, the phase content of CA6 can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc; [0121] the phase content of CMA can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 40%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100% etc; [0122] the phase content of ZrO.sub.2 can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, etc; [0123] the phase content of corundum can be 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, etc.

[0124] In a preferred embodiment, based on the percentage of the total mass of the refractory material, the total phase content of CA6 and CMA in said refractory material is 30-100%, for example, it may be 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc., preferably 55-100%.

[0125] In a more preferred embodiment, based on the percentage of the total mass of the refractory material, the material phase content of CA6 in said refractory material is 30-100%, for example, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc., preferably 55-100%.

[0126] In a more preferred embodiment, based on the percentage of the total mass of the refractory material, the material phase content of CA6 in the refractory material is 30-100%, preferably 55-100%. In addition to the CA6 phase, the other phases are preferred in the order ZrO.sub.2>CMA>corundum. That is, the inclusion of ZrO.sub.2 is preferred over the inclusion of CMA, and the inclusion of CMA is preferred over the inclusion of corundum.

[0127] In one specific embodiment, based on the percentage of the total mass of the refractory material, in said refractory material, the material phase content of CA6 is 0-100%, the material phase content of CMA is 0-100%, the material phase content of corundum is 0-70%, and the material phase content of ZrO.sub.2 is 0-35%.

[0128] In a preferred embodiment, based on the percentage of the total mass of the refractory material, in said refractory material, the material phase content of CA6 is 0-100%, the material phase content of CMA is 0-100%, the material phase content of corundum is 0-30%, the material phase content of ZrO.sub.2 is 0-15%, and the total phase content of CA6 and CMA is 52.5%-100%.

[0129] In a more preferred embodiment, based on the percentage of the total mass of the refractory material, in said refractory material, the material phase content of CA6 is 52.5-100%, the material phase content of corundum is 0-30%, and the material phase content of ZrO.sub.2 is 0-15%.

[0130] In a specific embodiment, the refractory material of the present application, based on the percentage of the total mass of the refractory material, the content of the sintering-promoting component in the refractory material is ?1.5%, preferably 0.

[0131] For example, based on the percentage of the total mass of the refractory material, the content of the sintering-promoting component in said refractory maybe 1.5%, 1.4%, 1.3%, 1.2%, 1.1%, 1.0%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2%, 0.1%, 0 or any range in between.

[0132] The said sintering-promoting components are SiO.sub.2, TiO.sub.2, Fe.sub.2O.sub.3, and R.sub.2O, due to the low content of the sintering-promoting components, the purity of chemical composition in the material system is high, whereas R.sub.2O refers to oxides of alkali metals.

[0133] In a specific embodiment, the refractory material of the present application, the chemical composition of said refractory material in terms of the percentage content of the total mass of said refractory material comprising

[0134] In a specific embodiment, the refractory material of the present application, based on the percentage of the total mass of the refractory material, the chemical composition of said refractory material comprises: [0135] 55.72%-97.48% of Al.sub.2O.sub.3, preferably 72.86%-94.12% of Al.sub.2O.sub.3, e.g. it may be 55.72%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 97.48% or any range in between of Al.sub.2O.sub.3; [0136] 1.76%-8.38% of CaO, preferably 3.20%-8.40% of CaO, e.g., it may be 1.76%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.38% or any range in between of CaO; [0137] 0-8.4% of MgO, preferably 0%-6.72% of MgO, which may be, for example, 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.4% or any range in between of MgO; and [0138] 0-35% of ZrO.sub.2, preferably 0-15% of ZrO.sub.2, e.g., it may be 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35% or any range in between of ZrO.sub.2.

[0139] In a specific embodiment, the refractory material of the present application, based on the percentage of the total mass of the refractory material, the chemical composition of said refractory material comprises: 53.20%?97.13% of Al.sub.2O.sub.3, 0-8.40% of MgO, 1.60%?8.40% of CaO, and 0-35% of ZrO.sub.2.

[0140] In a preferred embodiment, the refractory material of the present application, based on the percentage of the total mass of the refractory material, the chemical composition of said refractory material comprises: 71.06%-94.10% of Al.sub.2O.sub.3, 0-8.40% of MgO, 3.05%-8.40% of CaO, and 0-15% of ZrO.sub.2.

[0141] In a more preferred embodiment, the refractory material of the present application, based on the percentage of the total mass of the refractory material, the chemical composition of said refractory material comprises: 75.58%-94.10% of Al.sub.2O.sub.3, 4.16%-8.40% of CaO, and 0-15% of ZrO.sub.2.

[0142] The chemical composition of the said refractory is determined by fluorescence analysis, that is, XRF, following GB/T21114-2007.

[0143] In a specific embodiment, the bulk density of the refractory material is 2.90?3.65 g/cm.sup.3, preferably 2.95 g/cm.sup.3?3.35 g/cm.sup.3, for example, 2.90 g/cm.sup.3, 2.91 g/cm.sup.3, 2.92 g/cm.sup.3, 2.93 g/cm.sup.3, 2.95 g/cm.sup.3, 2.96 g/cm.sup.3, 2.97 g/cm.sup.3, 2.98 g/cm.sup.3, 2.99 g/cm.sup.3, 3.00 g/cm.sup.3, 3.05 g/cm.sup.3, 3.10 g/cm.sup.3, 3.15 g/cm.sup.3, 3.25 g/cm.sup.3, 3.35 g/cm.sup.3, 3.40 g/cm.sup.3, 3.45 g/cm.sup.3, 3.50 g/cm.sup.3, 3.55 g/cm.sup.3, 3.60 g/cm.sup.3, 3.65 g/cm or any range in between.

[0144] The bulk density of the refractory material is determined according to GB/T2997-2000.

[0145] In one specific embodiment, the phase of the matrix part of said refractory comprises one or two or more of corundum, CA6, CMA, and ZrO.sub.2.

[0146] In one specific embodiment, the phase of the matrix part of said refractory comprises corundum, CA6, and CMA.

[0147] In a specific embodiment, based on the percentage of the total mass of the matrix part of said refractory material, in said matrix part,

[0148] The phase content of corundum is 0-100%, preferably 0-50%.

[0149] The phase content of CA6 is 0-100%;

[0150] The phase content of CMA is 0-100%;

[0151] The phase content of ZrO.sub.2 is 0-50%, preferably 0-25%.

[0152] For example, based on the percentage of the total mass of the matrix part of said refractory material, in the matrix part, the phase content of the corundum can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.; [0153] The phase content of CA6 can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100% etc; [0154] The phase content of CMA can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 40%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.; [0155] The phase content of ZrO.sub.2 can be 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc.

[0156] In a preferred embodiment, based on the percentage of the total mass of the matrix part of the refractory material, the total phase content of CA6 and CMA in the matrix part is 25%-100%, such as 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.

[0157] In a more preferred embodiment, based on the percentage of the total mass of the matrix part of the refractory material, the phase content of CA6 in the matrix part is 25%-100%, such as 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.

[0158] In a more preferred embodiment, a multi-phase composite is preferred in the matrix part of said refractory material. For example, a three-phase composite of ZrO.sub.2, CMA, and corundum is preferred over a two-phase composite of CMA and corundum.

[0159] In a specific embodiment, based on the percentage of the total mass of the matrix part of said refractory material, in said matrix part, the phase content of CA6 is 0-100%, the phase content of CMA is 0-100%, the phase content of corundum is 0-100% and the phase content of ZrO.sub.2 is 0-50%.

[0160] In a preferred embodiment, based on the percentage of the total mass of the matrix part of said refractory material, in said matrix part, the phase content of CA6 is 0-100%, the phase content of CMA is 0-100%, the phase content of corundum is 0-50% and the phase content of ZrO.sub.2 is 0-25%.

[0161] In a more preferred embodiment, based on the percentage of the total mass of said matrix part of the refractory material, in said matrix part, the phase content of CA6 is 0-100%, the phase content of corundum is 0-50%, and the phase content of ZrO.sub.2 is 0-25%.

[0162] In a specific embodiment, based on the percentage of the total mass of said matrix portion of the refractory material, the chemical composition of said matrix part of the refractory material comprises: [0163] 42.5%-100% of Al.sub.2O.sub.3, preferably 64.29%-95.8% of Al.sub.2O.sub.3; [0164] 0-8.4% of CaO, preferably 1.47%-8.4% of CaO; [0165] 0-8.4% of MgO, preferably 0-6.72% of MgO; and [0166] 0-50% of ZrO.sub.2, preferably 0-25% of ZrO.sub.2; [0167] For example, based on the percentage of the total mass of the matrix part of said refractory material, the content of Al.sub.2O.sub.3 may be 42.5%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.; [0168] The content of CaO may be 0, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.4%, etc; [0169] The content of MgO may be 0, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.4%, etc; [0170] The content of ZrO.sub.2 is 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc.

[0171] In one specific embodiment, based on the percentage of the total mass of said matrix part of the refractory material, the chemical composition of said matrix part of the refractory material comprises 41.2%-99.5% of Al.sub.2O.sub.3, 0-8.40% of MgO, 0-8.40% of CaO and 0-50% of ZrO.sub.2.

[0172] In a preferred embodiment, based on the percentage of the total mass of said matrix part of the refractory material, the chemical composition of said matrix part of the refractory material comprises 63.15%-95.80% of Al.sub.2O.sub.3, 0-8.40% of MgO, 1.35%-8.40% of CaO and 0-25% of ZrO.sub.2.

[0173] In a more preferred embodiment, based on the percentage of the total mass of said matrix part of the refractory material, the chemical composition of said matrix part of the refractory material comprises 67.46%-95.80% of Al.sub.2O.sub.3, 2.0%-8.40% of CaO and 0-25% of ZrO.sub.2.

[0174] The said matrix part of the refractory material refers to the part that does not include granular material.

[0175] The phase of matrix part of the refractory material is determined by micro-area diffraction using XRD.

[0176] For example, the micro-area diffraction determination can be performed by selecting seven different samples from which seven specimens are cut out. The matrix part of each specimen is subjected to micro-area diffraction, and the pattern is fitted to the full spectrum to determine the content of each phase. The two data with large deviations are removed, and the remaining five specimens were averaged to obtain the phase content of the refractory material matrix. The selected matrix area should be maximized when making the sample and scanning to ensure accurate analysis and low deviation.

[0177] In a specific embodiment, the refractory material of the present application is prepared by a method comprising the following steps: [0178] mixing a granular material and a fine powder to obtain a mixed material, then subjecting the mixed material to hot-pressed sintering to obtain said refractory material.

[0179] The granular material refers to the part that cannot be sieved through a 180-mesh square-hole sieve (e.g., the square-hole sieve produced by Xinxiang Zhongtuo Machinery Co. mm), i.e. the part located on the 180-mesh square hole sieve with a particle size of above 0.088 mm, for example, the particle size of the granular material can be 0.20 mm, 0.25 mm, 0.30 mm, 0.35 mm, 0.40 mm, 0.45 mm, 0.50 mm, 0.55 mm, 0.60 mm, 0.65 mm, 0.70 mm, 0.75 mm, 0.80 mm, 0.85 mm, 0.90 mm, 0.95 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 12 mm, 14 mm, 15 mm, 17 mm, 19 mm, 20 mm, 22 mm, 24 mm, 25 mm or any range in between, preferably 0.088-10 mm.

[0180] The fine powder refers to the part passing through the 180-mesh square hole sieve, that is, the part located at the bottom of the 180-mesh square hole sieve with a particle size of less than 0.088 mm.

[0181] The hot-pressed sintering of this application refers to a method of achieving sintering and preparing materials under the combined action of applied pressure and temperature.

[0182] In a specific embodiment, the refractory material of the present application, the total mass of said granular material to the total mass of said fine powder is 30-65:35-70, preferably 40-65:35-60. For example it may be 30:70, 31:69, 32:68, 33:67, 34:66, 35:65, 36:64, 37:63, 38:62, 39:61 40:60.41:59, 42:58, 43:57, 44:56, 45:55, 46:54, 47:53, 48:52, 49:51, 50:50.51:49, 52:48, 53:47, 54:46, 55:45, 56:44, 57:43, 58:42, 59:41, 60:40.61.39, 62:38, 63:37, 64:36, 65:35, or any range in between

[0183] In a specific embodiment, the refractory material of the present application, said granular material is one or two or three selected from CA6 granular material, C2M2A14 granular material, and CM2A8 granular material. Based on the percentage of the total mass of the fine powder, the fine powder comprises 50%-100% of Al.sub.2O.sub.3CaOMgO system fine powder, preferably 75%-100% of Al.sub.2O.sub.3CaOMgO system fine powder (for example comprising 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100% or any range in between of Al.sub.2O.sub.3CaOMgO system fine powder) and 0-50% of ZrO.sub.2-containing fine powder, preferably 0-25% of ZrO.sub.2-containing fine powder, e.g., comprising 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% or any range in between of ZrO.sub.2-containing fine powder.

[0184] In a specific embodiment, the refractory material of the present application, the Al.sub.2O.sub.3CaOMgO fine powder system is one or two or more selected from the group consisting of: CA6 fine powder, C2M2A14 fine powder, CM2A8 fine powder, Al.sub.2O.sub.3-containing fine powder, a mixed powder of Al.sub.2O.sub.3-containing fine powder and CaO-containing fine powder, a mixed powder of Al.sub.2O.sub.3-containing fine powder, CaO-containing fine powder and MgO-containing fine powder; [0185] the Al.sub.2O.sub.3-containing fine powder is one or two or more selected from the group consisting of: active ?-Al.sub.2O.sub.3 fine powder, ?-Al.sub.2O.sub.3 fine powder, ?-Al.sub.2O.sub.3 fine powder, aluminum hydroxide fine powder, industrial alumina fine powder, white corundum fine powder, sintered corundum fine powder, and tabular corundum fine powder; [0186] the MgO-containing fine powder is one or two or more selected from the group consisting of: magnesium carbonate fine powder, light-calcined magnesia fine powder, brucite fine powder, magnesium hydroxide fine powder, magnesium chloride fine powder, sintered magnesia fine powder and fused magnesia fine powder; [0187] the CaO-containing fine powder is one or two or more selected from the group consisting of: quicklime fine powder, limestone fine powder, calcium hydroxide fine powder, CaO.Math.Al.sub.2O.sub.3 fine powder (CA fine powder), CaO.Math.2Al.sub.2O.sub.3 fine powder (CA2 fine powder), and 12CaO.Math.7Al.sub.2O.sub.3 fine powder (C.sub.12A.sub.7 fine powder); and [0188] the ZrO.sub.2-containing fine powder is one or two or more selected from the group consisting of: monoclinic zirconia fine powder, tetragonal zirconia fine powder, desiliconized zirconium fine powder, and fused zirconia fine powder.

[0189] The term Al.sub.2O.sub.3-containing fine powder in this application refers to a fine powder of alumina system whose chemical composition is mainly Al.sub.2O.sub.3.

[0190] The term MgO-containing fine powder in this application refers to a fine powder whose chemical composition is mainly MgO.

[0191] The term CaO-containing fine powder in this application refers to a fine powder whose chemical composition comprises CaO components, a fine powder including CaO, and Al.sub.2O.sub.3, or a fine powder including CaO, MgO, and Al.sub.2O.sub.3.

[0192] The term ZrO.sub.2-containing fine powder in this application refers to a fine powder whose chemical composition is mainly ZrO.sub.2.

[0193] The active ?-Al.sub.2O.sub.3 fine powder of this application is an alumina powder with high activity (which is mainly ?-Al.sub.2O.sub.3), obtained by treating industrial alumina or aluminum hydroxide as a raw material at 1250-1450? C.;

[0194] The ?-Al.sub.2O.sub.3 fine powder of this application is an alumina powder with a high specific surface area and good adsorption properties, obtained by treating aluminum hydroxide as a raw material.

[0195] The ?-Al.sub.2O.sub.3 fine powder of this application is an alumina powder with a certain degree of hydration bonding obtained by rapid treatment of aluminum hydroxide at 600-900? C.

[0196] The industrial alumina fine powder of this application is a mineral whose main component is ?-Al.sub.2O.sub.3, which is prepared by calcining aluminum hydroxide as raw material at 900-1250? C.

[0197] The white corundum fine powder of this application is an alumina raw material with an alumina trioxide (Al.sub.2O.sub.3) content of 97.5% or more, prepared by electric melting of industrial alumina as raw material, and comprises a small amount of iron oxide, silicon oxide, and other components, and is white in color.

[0198] The sintered corundum fine powder in this application refers to refractory clinker made from alumina as raw material, finely ground into pellets or billets, and sintered at 1750-1900? C. It has a high bulk density, low porosity, and excellent resistance to thermal shock and slag erosion at high temperatures.

[0199] The tabular corundum fine powder in this application has a coarsely crystallized and well-developed ?-Al.sub.2O.sub.3 crystal structure with an Al.sub.2O.sub.3 content of 97.0% or more and it has a tabular crystal structure with small pores and a high number of closed pores.

[0200] The light-calcined magnesia fine powder in this application is a magnesia powder raw material with a high activity and magnesite phase, prepared by calcining magnesite at a temperature of 800-1000? C., with magnesium carbonate as the main component.

[0201] The brucite fine powder in this application is a raw material with Mg(OH).sub.2 as the main component.

[0202] The sintered magnesia fine powder in this application is a dense magnesia raw material with a MgO content of ?94.5%, produced by light-calcined magnesia at high temperatures.

[0203] The fused magnesa fine powder in this application is a dense magnesium oxide raw material with a MgO content of ?96.5% prepared by arc melting from light-calcined magnesia or magnesite.

[0204] The main component of the quicklime fine powder in this application is calcium oxide, which is usually prepared by calcining a natural rock whose main component is calcium carbonate at a high temperature to decompose and produce carbon dioxide and calcium oxide with the chemical formula: CaO, i.e., quicklime, also known as marble.

[0205] The monoclinic zirconia fine powder in this application refers to zirconia fine powder with a monoclinic crystal system.

[0206] The tetragonal zirconia fine powder in this application refers to zirconia fine powders with a tetragonal crystal system.

[0207] The desiliconized zirconium fine powder in this application refers to zirconia fine powder obtained by debilitating zircon sand.

[0208] The fused zirconia fine powder in this application refers to the raw material of zirconia prepared by the fusion method.

[0209] In a specific embodiment, the refractory material of the present application, said hot-pressed sintering is putting the mixed material into a mold of a high temperature device for hot-pressed sintering or molding the mixed material at normal temperature, and then putting it into a mold of a high temperature device for hot-pressed sintering or molding the mixed material at normal temperature, and sintering it at low temperature, and then putting it into a mold of a high temperature device for hot-pressed sintering.

[0210] Putting said mixed material into a mold of a high-temperature device for hot-pressed sintering means that the mixed material is put into the mold of the high-temperature device to warm up, applying pressure when the temperature rises to the maximum temperature to reach sintering, or continuously holding the temperature and pressure for a certain time to complete the hot-pressed sintering of the material; or putting the mixed material into the mold of the high-temperature device, applying pressure when the temperature is raised to a certain temperature, then gradually increasing the temperature and simultaneously gradually increasing the pressure until the temperature reaches the maximum temperature and the pressure reaches the maximum value, or continuously holding the temperature and pressure for a certain time to complete the hot-pressed sintering of the material; or putting the mixed material into the mold of the high-temperature device and gradually increasing the pressure applied to the mixture while the temperature is increased until the temperature reaches the maximum temperature and the pressure reaches the maximum value, or continuously holding the temperature and pressure for a certain time to complete the hot-pressed sintering of the material.

[0211] Molding the mixed material at normal temperature, and then putting it into a mold of a high temperature device for hot-pressed sintering means that the mixed material is pressed into a billet at normal temperature, drying it and then putting it in the mold of the high temperature device for hot-pressed sintering; or applying pressure when the billet is heated to the maximum temperature to reach sintering, or continuously holding the temperature and pressure for a certain period of time to complete the hot-pressed sintering of the material; or putting the billet into the mold of the high-temperature device, and applying pressure when the temperature is raised to a certain temperature, then gradually raising the temperature and simultaneously increasing the applied pressure until the temperature reaches the maximum temperature and the pressure reaches the maximum value, or continuously holding the temperature and pressure for a certain period of time to complete the hot-pressed sintering of the material; or putting the billet into the mold of the high-temperature device, and gradually increasing the pressure applied to the mixed material while the temperature is increased until the temperature reaches the maximum temperature and the pressure reaches the maximum value, or continuously holding the temperature and pressure for a certain period of time to complete the hot-pressed sintering of the material.

[0212] Molding the mixed material at normal temperature, and sintering it at low temperature, and then putting it into a mold of a high temperature device for hot-pressed sintering means that the mixed material is pressed at normal temperature and pre-sintered at 1350 to 1500? C. before hot-pressed sintering. The hot-pressed sintering operation is the same as above.

[0213] In a specific embodiment, the refractory material of this application, the high temperature device is a kiln that combines high temperature and hot pressing.

[0214] In a specific embodiment, the refractory material of this application, the temperature of the hot-pressed sintering is 1550? C.-1800? C. For example, it may be 1550? C., 1600? C., 1650? C., 1700? C., 1750? C., 1800? C. or any range in between. The pressure of hot-pressed sintering is 0.5?30 MPa, For example, it can be 0.5 MPa, 1 MPa, 1.5 MPa, 2 Mpa, 2.5 MPa, 3 Mpa, 3.5 MPa, 4 Mpa, 4.5 MPa, 5 Mpa, 5.5 MPa, 6 Mpa, 6.5 MPa, 7 Mpa, 7.5 MPa, 8 Mpa, 8.5 MPa, 9 Mpa, 9.5 MPa, 10 MPa, 10.5 MPa, 11 MPa, 11.5 MPa, 12 MPa, 12.5 MPa, 13 MPa, 13.5 MPa, 14 MPa, 14.5 MPa, 15 MPa, 20 MPa, 25 MPa, 30 MPa or any range in between.

[0215] The pressure mentioned refers to the hot-pressed strength, and hot-pressed strength is the pressure per unit area applied to the prepared refractory material at high temperatures.

[0216] In a specific embodiment, the refractory material of this application, the total content of CaO, Al.sub.2O.sub.3 and MgO in the chemical composition of the granular material is ?97.5%. The bulk density of the granular material is ?2.90 g/cm.sup.3, such as 2.90 g/cm.sup.3, 2.91 g/cm.sup.3, 2.92 g/cm.sup.3, 2.93 g/cm.sup.3, 2.94 g/cm.sup.3, 2.95 g/cm.sup.3, 2.96 g/cm.sup.3, 2.97 g/cm.sup.3, 2.98 g/cm.sup.3, 2.99 g/cm.sup.3, 3.00 g/cm.sup.3, 3.05 g/cm.sup.3, 3.10 g/cm.sup.3, 3.15 g/cm.sup.3, 3.25 g/cm.sup.3, 3.30 g/cm.sup.3, 3.35 g/cm.sup.3, 3.40 g/cm.sup.3, 3.45 g/cm.sup.3, 3.50 g/cm.sup.3, 3.55 g/cm.sup.3, 3.60 g/cm.sup.3, 3.65 g/cm.sup.3, etc.

[0217] When the granular material for the preparation of the refractory material is CA6 granular material, the fine powder comprises CA6 fine powder, or Al.sub.2O.sub.3-containing fine powder, or CA6 fine powder and Al.sub.2O.sub.3-containing fine powder, or Al.sub.2O.sub.3-containing powder and CaO-containing fine powder.

[0218] In one specific embodiment, the refractory material of the present application, the physical phase comprises CA6.

[0219] In a specific embodiment, the refractory material of this application, the physical phase comprises corundum and CA6.

[0220] In a specific embodiment, said fine powder further comprises ZrO.sub.2 fine powder, and the phase of the refractory material of the present application further comprises ZrO.sub.2.

[0221] In a specific embodiment, the refractory material of the present application, based on the percentage of the total mass of said refractory material; [0222] The phase content of CA6 is 30%-100%, preferably 55%-100%, for example 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.; [0223] The phase content of corundum is 0-70%, preferably 0-30%, for example 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, etc.; [0224] The phase content of ZrO.sub.2 is 0-35%, preferably 0-15%, for example 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, etc.

[0225] In a specific embodiment, the refractory material of the present application, based on the percentage of the total mass of said refractory material, the chemical composition of said refractory material comprises: [0226] 59.54%-97.48% of Al.sub.2O.sub.3, preferably 77.86%-94.12% of Al.sub.2O.sub.3, for example 59.54%, 62%, 65%, 67%, 70%, 73%, 75%, 77%, 80%, 83%, 85%, 90%, 92%, 95%, 96.64%, 97%, 97.48%, etc; [0227] 2.52%-8.4% of CaO, preferably 4.62%-8.4% of CaO, for example 2.52%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.4%, etc.; and [0228] 0-35% of ZrO.sub.2, preferably 0-15% of ZrO.sub.2, for example 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35% etc.

[0229] In a specific embodiment, the refractory material of the present application, the phase of the matrix part of said refractory material comprises one or two of corundum and CA6.

[0230] In a specific embodiment, the refractory material of the present application, the phase of said matrix part of the refractory material comprises: one or two of corundum and CA6, and ZrO.sub.2.

[0231] In a specific embodiment, the refractory material of the present application, based on the percentage of the total mass of the matrix part of said refractory material, in the matrix part: [0232] The phase content of corundum is 0-100%, preferably 0-50%; for example 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100% etc.; [0233] the phase content of CA6 is 0-100%, preferably 25-100%, e.g., 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100% etc.; and [0234] the phase content of ZrO.sub.2 is 0-50%, preferably 0-25%; for example 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, etc.

[0235] In a specific embodiment, based on the percentage of the total mass of the matrix part of said refractory material, the chemical composition of the matrix part of the refractory material of the present application comprises: [0236] 45.8%-100% of Al.sub.2O.sub.3, preferably 68.7%-95.8% of Al.sub.2O.sub.3; for example 45.8%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.; [0237] 0-8.4 of CaO, preferably 2.1%-8.4% of CaO; for example 0, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.4%, etc.; and [0238] 0-50% of ZrO.sub.2, preferably from 0 to 25% ZrO.sub.2, for example, 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50% etc.

[0239] When the granular material for the preparation of the refractory material is CMA granular material, or CMA granular material and CA6 granular material, the fine powder comprises one or two or three of CA6 fine powder, CMA fine powder, and Al.sub.2O.sub.3-containing fine powder.

[0240] In a specific embodiment, the phase of the refractory material of this application comprises CMA.

[0241] In a specific embodiment, the refractory material of this application comprises one or two of corundum and CA6, and CMA.

[0242] In a specific embodiment, the fine powder further comprises ZrO.sub.2 fine powder, and the phase of the refractory material in the application further comprises ZrO.sub.2.

[0243] In a specific embodiment, the refractory material of the present application, based on the percentage of the total mass of the refractory material, [0244] the phase content of CMA is 30-100%, preferably 55-100%, for example 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100% etc.;

[0245] When CM2A8 is used as aggregate and fine powder, its content is preferably 0-80%. [0246] the phase content of CA6 is 0-70%, preferably 0-60%, for example 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70% etc.; [0247] the phase content of corundum is 0-70%, preferably 0-30%, for example 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70% etc.; and [0248] the phase content of ZrO.sub.2 is 0-35%, preferably 0-15%, for example 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35% etc.

[0249] In a specific embodiment, the refractory material of the present application, based on the percentage of the total mass of the refractory material, the chemical composition of the refractory material comprises: [0250] 55.72%-96.43% of Al.sub.2O.sub.3, preferably 72.86%-92.72% of Al.sub.2O.sub.3, for example 55.72%, 60%, 62%, 65%, 67%, 70%, 73%, 75%, 77%, 80%, 83%, 85%, 90%, 92%, 95.24%, 96.43% etc.; [0251] 1.76%-7.95% of CaO, preferably 3.23%-7.80% of CaO, for example 1.76%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 7.95% etc.; [0252] 1.48%-8.4% of MgO, preferably 1.98%-6.72% of MgO, for example 1.48%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.4% etc.; and [0253] 0-35% of ZrO.sub.2, preferably 0-15% of ZrO.sub.2, for example 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35% etc.

[0254] In a specific embodiment, the refractory material of the present application, the phase of the matrix part of said refractory material comprises one or two or three of corundum, CA6, and CMA.

[0255] In a specific embodiment, the refractory material of the present application, the phase of the matrix part of said refractory material comprises: one or two or three of corundum, CA6 and CMA, and ZrO.sub.2.

[0256] In a specific embodiment, the refractory material of the present application, based on the percentage of the total mass of the matrix part of the refractory material, in the matrix part, [0257] the phase content of corundum is 0-100%, preferably 0-50%, for example 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, etc., 95%, 100%, etc.; [0258] the phase content of CA6 is 0-100%, preferably 25%-100%, for example 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc., 90%, 95%, 100%, etc.; [0259] the phase content of CMA is 0-100%, preferably 25%-100%, for example 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.; and [0260] The phase content of ZrO.sub.2 is 0-50%, preferably 0-25%; for example 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, etc.

[0261] In a specific embodiment, the chemical composition of the matrix part of the refractory material of the present application comprises: [0262] 42.86%-100% of Al.sub.2O.sub.3, preferably 64.29%-95.8% of Al.sub.2O.sub.3, for example 42.86%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.; [0263] 0-8.4% of CaO, preferably 1.47%-8.4% of CaO, for example 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.4%, etc.; [0264] 0-8.4% of MgO, preferably 0-8.4% of MgO, for example 0%, 0.5%, 1%, 1.5%2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.4%, etc.; and [0265] 0-50% of ZrO.sub.2, preferably 0-25% of ZrO.sub.2, for example 0%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 27%, 30%, 32%, 35%, 40%, 45%, 50%, etc.

[0266] The present application also provides a method of preparing a refractory material comprising the steps of: [0267] mixing a granular material and a fine powder to obtain a mixed material, then subjecting the mixed material to hot-pressed sintering to obtain the refractory material.

[0268] In a particular embodiment, the preparation method of the present application, the mass ratio of the granular material to the fine powder is 30-65:35-70, preferably 40-65:35-60.

[0269] In a specific embodiment, the preparation method of the present application, said fine powder has a particle size of less than 0.088 mm, and the said granular material has a particle size of greater than 0.088 mm, preferably 0.088 to 10 mm.

[0270] In a specific embodiment, the preparation method of the present application, said hot-pressed sintering is performed by putting the mixed material into a mold of a high temperature device for hot-pressed sintering or by molding the mixed material at normal temperature, and then putting it into a mold of a high temperature device for hot-pressed sintering or by molding the mixed material at normal temperature, and sintering it at low temperature, and then putting it into a mold of a high temperature device for hot-pressed sintering.

[0271] The present application promotes particle rearrangement and particle diffusion with high temperature and high pressure to obtain a refractory material with a low amount of high-temperature liquid phase, a homogeneous organizational structure, and good thermal shock stability performance.

[0272] The present application provides a working lining of a ladle for molten steel smelting, comprising the refractory material described above or the refractory material obtained by the preparation method described above.

[0273] The present application provides a working lining for molten aluminum smelting and transporting ladles, comprising the refractory material described above or the refractory material obtained by the preparation method described above.

[0274] The present application provides a refractory lining for industrial furnaces, comprising the refractory material described above or the refractory material obtained by the preparation method described above.

[0275] Based on the high purity, low oxygen potential, high erosion resistance, and potential function of cleaning molten steel of CA6 raw material, the refractory material with high purity, erosion resistance, and the function of cleaning molten steel is prepared without adding any sintering additives and relying on liquid phase sintering, which can give full play to the advantages of high purity raw material erosion resistance and the function of cleaning molten steel; the refractory material with a uniform structure is constructed, which not only solves the structural stress of the refractory material as a whole, but also solves the problems of slag penetration resistance and rapid erosion, and achieves the coordination and unity of penetration resistance and thermal shock stability. This not only gives full play to the advantages of high purity raw materials with good corrosion resistance and the function of CA6 material in cleaning the molten steel, but also takes into account the contradiction between thermal shock stability and slag penetration resistance, and also solves the problem that the refractory materials of ladle working lining are damaged too quickly under harsh refining conditions, reducing the problem of introducing refractory inclusions into steel, and achieving remarkable economic and social economic benefits.

EXAMPLES

[0276] In this application, the materials used in the tests and the test methods are described in general and/or specific terms, and in the following examples, unless otherwise specified, % indicates Wt %, which means weight percent. The reagents or instruments used, where no manufacturer is specified, are commercially available conventional reagent products; wherein Table 1 shows the raw materials and sources used in the examples.

TABLE-US-00001 TABLE 1 Main ingredients Raw materials content Manufacturers CA6 fine powder Al.sub.2O.sub.3 90.5~92.5% ZiBo City LuZhong CaO 7.4~9.0% Refractory Co., Ltd CA6 granule Al.sub.2O.sub.3 90.5~92.5% ZiBo City LuZhong material CaO 7.4~9.0% Refractory Co., Ltd ?-Al.sub.2O.sub.3 fine Al.sub.2O.sub.3 ? 96.0% Shandong Aluminium powder Company ?-Al.sub.2O.sub.3 fine Al.sub.2O.sub.3 ? 96.0% Shandong Aluminium powder Company Industrial alumina Al.sub.2O.sub.3 ? 96.0% Shandong Aluminium fine powder Company Tabular corundum Al.sub.2O.sub.3 ? 97.0% Anmai Aluminium fine powder Industry(Qingdao)Co., Ltd. White corundum Al.sub.2O.sub.3 ? 96.0% Zhengzhou Yufa Group fine powder 12CaOAl.sub.2O.sub.3 Al.sub.2O.sub.3 51.0~52.0% ZiBo City LuZhong fine powder CaO 48.0~49.0% Refractory Co., Ltd Desiliconized ZrO.sub.2 + H.sub.fO.sub.2 ? 91% Shandong Jin Taiyang zirconium fine Zirconium Industry powder Co., Ltd C2M2A14 Al.sub.2O.sub.3 ? 96.0%, ZiBo City LuZhong granule material CaO ? 96.0%, Refractory Co., Ltd MgO ? 4.3% Fused zirconia ZrO.sub.2 + H.sub.fO.sub.2 ? 98.5% Shandong Jin Taiyang fine powder Zirconium Industry Co., Ltd CM2A8 granule Al.sub.2O.sub.3 ? 84%, ZiBo City LuZhong material CaO ? 5.0%, Refractory Co., Ltd MgO ? 8.0% High purity MgO ? 96.5% Yingkou Jiamei magnesium sand Refractories Co., Ltd fine powder Quicklime fine CaO ? 91.5% Yingkou Jiamei powder Refractories Co., Ltd Monoclinic ZrO.sub.2 + H.sub.fO.sub.2 ? 98.5% Shandong Jin Taiyang zirconia fine Zirconium Industry powder Co., Ltd

[0277] The XRD method was used to analyze the phases of the refractory materials in each example by grinding them to below 325 mesh and then scanning them with an X-ray diffractometer (Bruker: D8ADVANCE). By analyzing the diffraction data and matching it with the standard PDF card, the relevant phase is obtained, and then the content of the relevant phase is obtained by fitting the diffraction data.

[0278] The XRF method was used to determine the chemical composition of the refractory materials in each example according to GB/T21114-2007.

[0279] The material phase of the matrix part of the refractory material described was analyzed by micro-area diffraction using XRD. In other words, 12 pieces of different refractory material were selected, and 12 specimens were cut out. In each specimen, a region of the matrix with a more homogeneous color and structure is selected for micro-area diffraction. The diffraction pattern is fitted to the full spectrum to determine the content of each phase. 2 data with large deviations are removed, and the phase content of the remaining ten specimens is averaged to give the phase content of the refractory material matrix.

Example 1

[0280] (1) 350 g of CA6 fine powder and 650 g of CA6 granule material were mixed and stirred evenly to obtain a mixed material, wherein the maximum particle size of granule material is 5 mm, and the bulk density is 3.15 g/cm.sup.3.

[0281] (2) The mixed material was put into a mold of a high-temperature device for hot-presses sintering. When the maximum temperature was 1650? C., the hot-pressed strength was 3 MPa for 1 hour, a calcium hexaaluminate-based refractory material with the function of cleaning molten steel was prepared.

[0282] The resulting refractory material was analyzed by XRD, and based on the percentage of the total mass of the refractory material, the phase content of CA6 in the refractory material was 100%.

[0283] The refractory material obtained was analyzed by XRF and said refractory material comprised 91.05% of Al.sub.2O.sub.3 and 8.40% of CaO in terms of the percentage of the total mass of said refractory material.

[0284] The phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD, and the phase of the matrix part of the refractory material comprised 100% of CA6.

[0285] The chemical composition of the matrix part of said refractory material comprised 91.0% of Al.sub.2O.sub.3 and 8.40% of CaO.

[0286] The refractory material obtained was analyzed by the drainage method, and the bulk density of said refractory material was 3.20 g/cm.sup.3.

Example 2

[0287] (1) 300 g of active ?-Al.sub.2O.sub.3 fine powder, 36 g of CaO.Math.Al.sub.2O.sub.3 fine powder, 200 g of white corundum fine powder, 100 g of ?-Al.sub.2O.sub.3 fine powder, and 150 g of monoclinic zirconia fine powder were evenly mixed, and then adding 400 g of CA6 granular material and stirring well to obtain a mixed material, wherein the maximum particle size of the granular material is 5 mmm, and the bulk density is 3.15 g/cm.sup.3.

[0288] (2) Appropriate water was added into the mixed material, stirring evenly, casting, drying, and then putting into a mold of a high-temperature device for hot-pressed sintering. The pressure was applied when the temperature was raised to 1350? C. The pressure was increased while the temperature was increased. When the maximum temperature was 1730? C., the maximum hot-pressed strength was 15 MPa for 20 minutes, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0289] The refractory material was analyzed by XRD, and the obtained phases were mainly CA6, corundum, and zirconium oxide. Based on the percentage of the total mass of the refractory material, in the the refractory material, the phase content of CA6 was 55%, the phase content of corundum was 28.5%, and the phase content of zirconium oxide was 15%.

[0290] The refractory material obtained was analyzed by XRF and based on the percentage of the total mass of the refractory material, the refractory material comprised 79.3% of Al.sub.2O.sub.3, 4.4% of CaO, and 15% of ZrO.sub.2.

[0291] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD, and the physical phase of the matrix part of said refractory material comprised mainly 24.0% of CA6, 47.5% of corundum and 25% of zirconium oxide.

[0292] The chemical composition of the matrix part of said refractory material comprised 71.7% of Al.sub.2O.sub.3, 1.98% of CaO, and 25% of ZrO.sub.2.

[0293] The bulk density of the refractory material was determined to be 3.25 g/cm.sup.3.

Example 3

[0294] (1) 300 g of CA6 fine powder, 200 g of sintered corundum fine powder and 153 g of aluminum hydroxide fine powder were evenly mixed, and then adding 400 g of CA6 granular material and stirring well to obtain a mixed material, wherein the maximum particle size of the granular material is 3 mm, and the bulk density is 2.90 g/cm.sup.3

[0295] (2) The mixed material was put in a mold of a high-temperature device and heated up while applying pressure until the temperature rises to a maximum of 1680? C. and the maximum hot-pressing strength is 2 MPa to produce a calcium hexaaluminate-based refractory material with clean steel.

[0296] The refractory material was analyzed by XRD, and the physical phases were mainly CA6 and corundum. Based on the percentage of the total mass of the refractory material, in said refractory material, the phase content of CA6 was 68.6% and the phase content of corundum was 30%.

[0297] The resulting refractory material was analyzed by XRF, and based on the percentage of the total mass of said refractory material, said refractory material comprised 94.12% of Al.sub.2O.sub.3 and 5.0% of CaO.

[0298] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD, and the physical phase of the matrix part of said refractory material mainly comprised 48.5% of CA6 and 50% of corundum.

[0299] The chemical composition of the matrix part of the refractory material comprised 95.8% of Al.sub.2O.sub.3 and 4.05% of CaO.

[0300] The bulk density of the refractory material was determined to be 2.95 g/cm.sup.3.

Example 4

[0301] (1) 400 g of CM2A8 fine powder and 100 g of desiliconized zirconia fine powder were evenly mixed, and then adding 100 g of CA6 granular material, 300 g of C2M2A14 granular material, and 100 g of CM2A8 granular material and stirring well to obtain a mixed material, wherein the maximum particle size of the granular material is 5 mm, and the bulk density is 2.98 g/cm.sup.3.

[0302] (2) The mixed material was put into a mold of a high-temperature device for hot-pressed sintering. The maximum temperature was 1720? C. and the pressure was applied at this temperature. When the hot-pressed strength was 6 MPa, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0303] The resulting refractory material was analyzed by XRD, and the phases obtained were mainly corundum and CM2A8. Based on the percentage of the total mass of the refractory material, in said refractory material, the phase content of CA6 was 9.71%, the phase content of C2M2A14 was 28.4%, the phase content of CM2A8 was 49.9%, and the phase content of zirconia was 9.46%.

[0304] The resulting refractory material was analyzed by XRF and based on percentage of the total mass of said refractory material, said refractory material comprised 77.5% of Al.sub.2O.sub.3, 5.43% of MgO, 5.68% of CaO, and 9.45% of ZrO.sub.2.

[0305] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD, and the physical phase of the matrix part of said refractory material mainly comprised CM2A8 with a phase content of 80% and zirconium oxide with a phase content of 18.7%.

[0306] The chemical composition of the matrix part of said refractory material comprised 67.9% of Al.sub.2O.sub.3, 6.72% of MgO, 4.05% of CaO, and 18.9% of ZrO.sub.2.

[0307] The bulk density of the refractory material was determined to be 3.20 g/cm.sup.3.

Example 5

[0308] (1) 200 g of CM2A8 fine powder, 100 g of industrial alumina fine powder, and 100 g of tetragonal zirconia fine powder were evenly mixed, and then adding 600 g of CM2A8 granular material and stirring well to obtain a mixed material, where the maximum particle size of the granular material is 3 mm, and the bulk density is 3.0 g/cm.sup.3.

[0309] (2) The mixed material was put into a mold of a high-temperature device for hot-pressed sintering. The maximum temperature was 1710 and the pressure was applied at this temperature. When the hot-pressed strength was 4 MPa, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0310] The refractory material was analyzed by XRD, and the obtained phases were mainly corundum and CM2A8. Based on the percentage of the total mass of the refractory material, in said refractory material, the phase content of corundum was 9.48%, the phase content of CM2A8 was 80.0% and the phase content of zirconium oxide was 9.72%.

[0311] The refractory material obtained was analyzed by XRF and based on the percentage of the total mass of said refractory material, the refractory material comprised 78.0% of Al.sub.2O.sub.3, 6.72% of MgO, 4.3% of CaO, and 9.6% of ZrO.sub.2.

[0312] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD, and the physical phase of the matrix part of said refractory material mainly comprised 50% of CM2A8, 25% of corundum, and 25% of zirconium oxide.

[0313] The chemical composition of the matrix part of said refractory material comprised 66.3% of Al.sub.2O.sub.3, 4.20% of MgO, 2.84% of CaO, and 25% of ZrO.sub.2.

[0314] The bulk density of the refractory material obtained was determined to be 3.10 g/cm.sup.3.

Example 6

[0315] (1) 450 g of CM2A8 fine powder and 150 g of fused zirconium oxide fine powder were evenly mixed, and then adding 400 g of CM2A8 granular material and stirring well to obtain a mixed material, wherein the maximum particle size of the granular material is 5 mm and the bulk density is 3.0 g/cm.sup.3.

[0316] (2) The mixed material was put in a mold of a high-temperature device for hot-pressed sintering. The maximum temperature was 1740? C. and the pressure was applied at this temperature. When the hot-pressed strength was 1 MPa, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0317] The refractory material was analyzed by XRD, and the obtained phases were mainly CM2A8 and zirconium oxide. Based on the percentage of the total mass of the refractory material, in said refractory material, the phase content of CM2A8 was 83.8% and the phase content of zirconium oxide was 15%.

[0318] The resulting refractory material was analyzed by XRF and, and based on the percentage of the total mass of said refractory material, said refractory material comprised 72.86% of Al.sub.2O.sub.3, 6.89% of MgO, 4.63% of CaO, and 15% of ZrO.sub.2.

[0319] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD, and the physical phase of the matrix part of said refractory material mainly comprised 73.89% of CM2A8 with a phase content of 73.89% and zirconium oxide with a phase content of 25%.

[0320] The chemical composition of the matrix part of the refractory material comprised 64.29% Al.sub.2O.sub.3, 6.0% MgO, 4.05% CaO, and 25% ZrO.sub.2.

[0321] The bulk density of the refractory material was determined to be 3.15 g/cm.sup.3

Example 7

[0322] (1) 150 g of CM2A8 fine powder, 200 g of sintered corundum fine powder, 102 g of ?-Al.sub.2O.sub.3 fine powder, and 150 g of monoclinic zirconia fine powder were evenly mixed, and then adding 400 g of CM2A8 granular material and stirring well to obtain a mixed material, wherein the maximum particle size of the granular material is 5 mm, and the bulk density is 3.25 g/cm.sup.3.

[0323] (2) The mixed material was put into a mold of a high-temperature device hot-pressed sintering. The maximum temperature was 1760? C. and the pressure was applied at this temperature. When the hot-pressed strength was 7 MPa, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0324] The refractory material was analyzed by XRD, and the phases were mainly corundum and CM2A8. Based on the percentage of the total mass of the refractory material, in said refractory material, the phase content of CM2A8 was 55%, the phase content of corundum was 30%, and the phase content of zirconium oxide was 14.3%.

[0325] The resulting refractory material was analyzed by XRF and, based on the percentage of the total mass of said refractory material, said refractory material comprised 76.1% of Al.sub.2O.sub.3, 4.52% of MgO, 3.2% of CaO, and 14.5% of ZrO.sub.2.

[0326] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD, and the physical phase of the matrix part of said refractory material mainly comprised corundum with a phase content of 50%, CM2A8 with a phase content of 28% and zirconium oxide with a phase content of 23.8%.

[0327] The chemical composition of the matrix part of the refractory material comprised 70.2% of Al.sub.2O.sub.3, 1.98% of MgO, 1.47% of CaO, and 24.2% of ZrO.sub.2.

[0328] The bulk density of the refractory material obtained was determined to be 3.28 g/cm.sup.3.

Example 8

[0329] (1) 350 g of CM2A8 fine powder and 350 g of fused zirconium oxide fine powder were evenly mixed, and then adding 300 g of CM2A8 granular material and stirring well to obtain a mixed material, wherein the maximum particle size of the granular material is 10 mm, and the bulk density is 3.56 g/cm.sup.3.

[0330] (2) The mixed material was put into a mold of a high-temperature device for hot-pressed sintering. The maximum temperature was 1550? C. and the pressure was applied at this temperature. When the hot-pressed strength was 30 MPa, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0331] The resulting refractory material was analyzed by XRD, and the phases obtained were mainly corundum and CM2A8. Based on the percentage of the total mass of the refractory material, in said refractory material, the phase content of CM2A8 was 63.7% and the phase content of zirconium oxide was 35%.

[0332] The resulting refractory material was analyzed by XRF and based on the percentage of the total mass of said refractory material, said refractory material comprised 55.72% of Al.sub.2O.sub.3, 5.28% of MgO, 3.63% of CaO, and 35% of ZrO.sub.2.

[0333] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD, and the physical phase of the matrix part of said refractory material mainly comprised CM2A8 with a phase content of 48.6% and zirconium oxide with a phase content of 50%.

[0334] The chemical composition of the matrix part of said refractory material comprised 41.5% of Al.sub.2O.sub.3, 3.98% of MgO, 2.75% of CaO, and 50% of ZrO.sub.2.

[0335] The bulk density of the refractory material was determined to be 3.65 g/cm.sup.3.

Example 9

[0336] (1) 300 g of C2M2A14 fine powder, 178 g of ?-Al.sub.2O.sub.3 fine powder, 14 g of fused magnesium oxide fine powder, 18 g of limestone fine powder, and 500 g of C2M2A14 granular material were mixed and stirred evenly to obtain a mixed material, wherein the maximum particle size of the granular material is 5 mm.

[0337] (2) The mixed material was molded at normal temperature, drying, treating at 1500? C. and then putting into a mold of a high-temperature device for hot-pressed sintering. The pressure was applied from the time the temperature was raised to 1550? C. The pressure was increased while the temperature was increased. When the temperature was heated up to 1800? C. and the maximum hot-pressed strength was 8 MPa, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0338] The resulting refractory material was analyzed by XRD, and the obtained phase was mainly C2M2A14, and based on the percentage of the total mass of the refractory material, the phase content of CM2A14 in the refractory material was 100%.

[0339] The resulting refractory material was analyzed by XRF, and based on the percentage of the total mass of the refractory material, said refractory material comprised 87.7% of Al.sub.2O.sub.3, 4.02% of MgO, and 6.29% of CaO.

[0340] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD, and the physical phase of the matrix part of said refractory material mainly comprised C2M2A14 with a phase content of 100%.

[0341] The chemical composition of the matrix part of the refractory material comprises 87.65% of Al.sub.2O.sub.3, 4.13% of MgO, and 6.37% of CaO.

[0342] The refractory material obtained was analyzed by the drainage method, and the bulk density of said refractory material was 3.55 g/cm.sup.3.

Example 10

[0343] (1) 500 g of CM2A8 fine powder, 264 g of aluminum hydroxide fine powder, 16.5 g of calcium hydroxide fine powder, 25 g of magnesium hydroxide fine powder, and 300 g of CM2A8 granular material were mixed and stirred evenly to obtain a mixed material, wherein the maximum particle size of the granular material is 8 mm.

[0344] (2) The mixed material was molded at normal temperature, then putting into a mold of a high-temperature device for hot-pressed sintering. After the temperature was raised to 1450? C., the pressure was applied. The pressure was increased while the temperature was increased. When the temperature was heated up to 1750? C., and the maximum hot-pressed strength was 10 MPa, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0345] The resulting refractory material was analyzed by XRD and the obtained phase was mainly CM2A8, and based on the percentage of the total mass of the refractory material, the phase content of CM2A8 in the refractory material was 100% in terms of.

[0346] The refractory material obtained was analyzed by XRF and based on the percentage of the total mass of the refractory material, the refractory material comprised 85.24% of Al.sub.2O.sub.3, 8.40% of MgO, and 5.58% of CaO.

[0347] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD to obtain a CM2A8 phase content of 100% in the matrix part of said refractory material.

[0348] The chemical composition of the matrix part of the refractory material comprised 85.12% of Al.sub.2O.sub.3, 8.40% of MgO, and 5.67% of CaO.

[0349] The refractory material obtained was analyzed by the drainage method, and the bulk density of said refractory material was 3.41 g/cm.sup.3.

Example 11

[0350] (1) 700 g of tabular corundum fine powder and 300 g of CA6 granule material were mixed and stirred evenly to obtain a mixed material, wherein the maximum particle size of the granule material is 3 mm, and the bulk density is 2.90 g/cm.sup.3;

[0351] (2) The mixed material was put in a mold of a high-temperature device for hot-pressed sintering. The maximum temperature was 1780? C. and the pressure was applied at this temperature. When the hot-pressed strength was 0.5 MPa, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0352] The refractory material was analyzed by XRD, and the obtained phases were mainly corundum and CA6. Based on the percentage of the total mass of the refractory material, in the refractory material, the phase content of corundum was 70% and the phase content of CA6 was 28.2% CA6.

[0353] The refractory material obtained was analyzed by XRF and based on the percentage of the total mass of the refractory material, the refractory material comprised 97.48% of Al.sub.2O.sub.3 and 2.38% of CaO.

[0354] The physical phase analysis of the matrix part of said refractory material was determined by XRD using micro-area diffraction to obtain a corundum phase content of 100% in the matrix part of said refractory material.

[0355] The chemical composition of the matrix part of the refractory material was 100% of Al.sub.2O.sub.3.

[0356] The bulk density of the refractory was determined to be 3.0 g/cm.sup.3.

Example 12

[0357] (1) 400 g of tabular corundum fine powder, 200 g of industrial alumina fine powder, 100 g of ?-Al.sub.2O.sub.3 fine powder, and 300 g of CM2A8 granule material were mixed and stirred evenly to obtain a mixed material, wherein the maximum particle size of the granule material is 1 mm and the bulk density is 3.04 g/cm.sup.3.

[0358] (2) The mixed material was put in a mold of a high-temperature device for hot-pressed sintering. The maximum temperature was 1600? C. and the pressure was applied at this temperature. When the hot-pressed strength was 20 MPa, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0359] The refractory material was analyzed by XRD, and the obtained phases were mainly corundum and CM2A8. Based on the percentage of the total mass of the refractory material, in the refractory material, the phase content of corundum was 68.35% and the phase content of CM2A8 was 28.9%.

[0360] The resulting refractory material was analyzed by XRF and based on the percentage of the total mass of the refractory material, the refractory material comprised 94.67% of Al.sub.2O.sub.3, 2.41% of MgO, and 1.76% of CaO.

[0361] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD to obtain a corundum phase content of 97.64% in the matrix part of said refractory material.

[0362] The chemical composition of the matrix part of the refractory material comprised 98.85% of Al.sub.2O.sub.3.

[0363] The bulk density of the refractory material was determined to be 2.90 g/cm.sup.3.

Example 13

[0364] (1) 500 g of CM2A8 fine powder, 264 g of aluminum hydroxide fine powder, 16.5 g of calcium hydroxide fine powder, 25 g of magnesium hydroxide fine powder, and 300 g of CM2A8 granular material were mixed and stirred evenly to obtain a mixed material, wherein the maximum particle size of the granular material is 8 mm, and the bulk density is 2.95 g/cm.sup.3.

[0365] (2) The mixed material was molded at normal temperature, drying, treating at 1500? C. and then putting into a mold of a high-temperature device for hot-pressed sintering. And when the temperature was raised to 1650? C., the hot-pressed strength of 2 MPa was applied to prepared a calcium hexaaluminate based refractory with the function of cleaning molten steel.

[0366] The refractory material was analyzed by XRD, and the obtained phases were mainly CM2A8 and CA6. Based on the percentage of the total mass of the refractory material, in the refractory material, the phase content of CM2A8 was 80%, the phase content of CA6 was 3.7%, the phase content of corundum was 6.3%, and the sum of these three phases was 90%. The remaining phases were CA2 and MA, wherein the phase content of CA2 was 3.85%, and the phase content of MA was 5.78%.

[0367] The refractory material obtained was analyzed by XRF and based on percentage of the total mass of the refractory material, the refractory material comprised 85.32% of Al.sub.2O.sub.3, 8.38% of MgO, and 5.53% of CaO.

[0368] The physical phase analysis of the matrix part of said refractory was determined by micro-area diffraction using XRD and in the matrix part of said refractory material, the phase content of CM2A8 was 71.4%, the phase content of CA6 was 5.28%, the phase content of corundum was 9.0%, the phase content of CA2 was 5.5% and the phase content of MA was 8.26%.

[0369] The chemical composition of the matrix part of said refractory material comprised 85.15% of Al.sub.2O.sub.3, 8.37% of MgO, and 5.71% of CaO.

[0370] The refractory material obtained was analyzed by the drainage method, and the bulk density of said refractory material was 2.92 g/cm.sup.3.

Example 14

[0371] (1) 350 g of CA6 fine powder, 94 g of activated alumina powder, 8.75 g of CaO, and 158 g of desiliconized zirconia fine powder were evenly mixed, and then adding 400 g of CA6 granular material and stirring well to obtain a mixed material, wherein the maximum particle size of the granular material is 5 mm.

[0372] (2) The mixed material was put into a mold of a high-temperature device for hot-pressed sintering. When the temperature was raised to 1550? C., the pressure was applied. When the pressure was increased while the temperature was raised to a maximum of 1640? C. and the hot-pressed strength was 12 MPa, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0373] The refractory material was analyzed by XRD, and the obtained phases were mainly CA6 and zirconium oxide. Based on the percentage of the total mass of the refractory material, the phase content of CA6 was 81.2% of CA6 and the phase content of zirconium oxide was 15%.

[0374] The refractory material obtained was analyzed by XRF and based on the percentage of the total mass of the refractory material, the refractory material comprised 75.58% of Al.sub.2O.sub.3, 6.75% of CaO, and 15% of ZrO.sub.2.

[0375] The physical phase analysis of the matrix part of said refractory material was determined by XRD using micro-area diffraction, and the physical phase of the matrix part of said refractory material mainly comprised 73.1% of CA6 phase content and 25% of zirconium oxide phase content.

[0376] The chemical composition of the matrix part of the refractory material comprised 67.46% of Al.sub.2O.sub.3, 6.02% of CaO, and 25% of ZrO.sub.2.

[0377] The bulk density of the refractory material was determined to be 3.20 g/cm.sup.3.

Example 2-1

[0378] (1) 116.5 g of active ?-Al.sub.2O.sub.3 fine powder, 36.7 g of CaO.Math.Al.sub.2O.sub.3 fine powder, 205 g of white corundum fine powder, 105 g of ?-Al.sub.2O.sub.3 fine powder, and 152 g of monoclinic zirconia fine powder were evenly mixed, and then adding 400 g of CA6 granular material and stirring well to obtain a mixed material, wherein the maximum particle size of the granular material is 5 mm.

[0379] (2) Appropriate water was added into the mixed material, stirring evenly, casting, drying, and putting it into a mold of a high-temperature device for hot-pressed sintering. The pressure was applied when the temperature was raised to 1350? C. The pressure was increased while the temperature was increased. When the maximum temperature was 1700? C., and the maximum hot-pressed strength was 15 MPa for 20 minutes, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0380] The refractory material was analyzed by XRD, and the obtained phases were mainly CA6, corundum, and zirconium oxide. Based on the percentage of the total mass of the refractory material, the phase content of CA6 was 52.5%, the phase content of corundum was 29.3%, and the phase content of zirconium oxide was 14.8%.

[0381] The resulting refractory material was analyzed by XRF and based on the percentage of the total mass of the refractory material, the refractory material comprised 79.12% of Al.sub.2O.sub.3, 4.16% of CaO, and 14.2% of ZrO.sub.2.

[0382] The physical phase analysis of the matrix part of said refractory material was determined by XRD using micro-area diffraction, and the physical phase of the matrix part of said refractory material mainly comprised 22.5% of CA6, 48.9% of corundum and 24.67% of zirconium oxide.

[0383] The chemical composition of the matrix part of said refractory material comprised 71.08% of Al.sub.2O.sub.3, 2.0% of CaO, and 23.71% of ZrO.sub.2.

[0384] The bulk density of the refractory material was determined to be 3.20 g/cm.sup.3.

Example 3-1

[0385] (1) 300 g of CA6 fine powder, 205 g of sintered corundum fine powder, and 157.7 g of aluminum hydroxide fine powder were evenly mixed, and then adding 400 g of CA6 granular material and stirring well to obtain a mixed material, wherein the maximum particle size of the granular material is 3 mm.

[0386] (2) The mixed material was put into a mold of a high-temperature device for heating. When the temperature was up to 1550? C. and the maximum hot-pressed strength was 30 MPa, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0387] The refractory material was analyzed by XRD, and the physical phases were mainly CA6 and corundum. Based on the percentage of the total mass of the refractory material, the phase content of CA6 was 68.28% of and the phase content of corundum was 30%.

[0388] The resulting refractory material was analyzed by XRF and based on the percentage of the total mass of the refractory material, the refractory material comprised 94.10% of Al.sub.2O.sub.3 and 5.62% of CaO.

[0389] The physical phase analysis of the matrix part of said refractory material was determined by XRD using micro-area diffraction, and the physical phase of the matrix part of said refractory material mainly comprised 47.6% of CA6 and 50% of corundum.

[0390] The chemical composition of the matrix part of said refractory comprising 95.8% of Al.sub.2O.sub.3 and 4.12% of CaO;

[0391] The bulk density of the refractory material obtained was determined to be 3.20 g/cm.sup.3.

Example 6-1

[0392] (1) 450 g of CM2A8 fine powder and 150 g of fused zirconia fine powder were evenly mixed, then adding 400 g of CM2A8 granular material and stirring well to obtain a mixed material, wherein the maximum particle size of the granular material is 5 mm.

[0393] (2) The mixed material was put into a mold of a high-temperature device for hot-pressed sintering. The pressure was applied when the temperature was risen to 1450? C. Increasing the pressure while the temperature was increased, when the maximum temperature was 1760? C., the hot-pressed strength was 2 MPa, a calcium hexaaluminate refractory material with the function of cleaning molten steel was prepared.

[0394] The refractory material was analyzed by XRD, and the obtained phases were mainly CM2A8 and zirconium oxide. Based on the percentage of the total mass of the refractory material, the phase content of CM2A8 was 82.5% and the phase content of zirconium oxide was 15%.

[0395] The resulting refractory material was analyzed by XRF and based on the percentage of the total mass of the refractory material, the refractory material comprised 71.06% of Al.sub.2O.sub.3, 6.54% of MgO, 4.63% of CaO, and 15% of ZrO.sub.2.

[0396] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD, and the physical phase of the matrix part of said refractory material mainly comprised 73.89% of CM2A8 phase and 25% of zirconium oxide phase.

[0397] The chemical composition of the matrix part of the refractory material comprised 63.15% of Al.sub.2O.sub.3, 6.13% of MgO, 4.25% of CaO, and 25% of ZrO.sub.2.

[0398] The bulk density of the refractory material was determined to be 3.20 g/cm.sup.3.

Example 7-1

[0399] (1) 150 g of CM2A8 fine powder, 205 g of sintered corundum fine powder, 105 g of ?-Al.sub.2O.sub.3 fine powder, and 152 g of monoclinic zirconia fine powder were evenly mixed, and then adding 400 g of CM2A8 granular material and mixing well to obtain a mixed material, wherein the maximum particle size of the granular material is 5 mm.

[0400] (2) The mixed material was put into a mold of a high-temperature device for hot-pressed sintering at a maximum temperature of 1700? C. The pressure is applied at this temperature with a hot-pressed strength of 7 MPa, and a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0401] The refractory material was analyzed by XRD, and the obtained phases were mainly corundum, CM2A8, and zirconium oxide. Based on the percentage of the total mass of the refractory material, the phase content of CM2A8 was 52.5%, the phase content of corundum was 30% and the phase content of zirconium oxide was 14.43%.

[0402] The refractory material obtained was analyzed by XRF and based on percentage of the total mass of the refractory material, the refractory material comprised 75.23% of Al.sub.2O.sub.3, 4.18% of MgO, 3.05% of CaO, and 14.48% of ZrO.sub.2.

[0403] The physical analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD, and the physical phase of the matrix part of said refractory mainly comprised 50% of corundum phase content, 23.5% of CM2A8 phase content and 24.5% of zirconium oxide phase content.

[0404] The chemical composition of the matrix part of the refractory material comprised 69.6% of Al.sub.2O.sub.3, 2.0% of MgO, 1.35% of CaO, and 24.2% of ZrO.sub.2.

[0405] The bulk density of the refractory material was determined to be 3.20 g/cm.sup.3.

Example 8-1

[0406] (1) 350 g of CM2A8 fine powder and 350 g of fused zirconia fine powder were evenly mixed, and then adding 300 g of CM2A8 granular material and stirring well to obtain a mixed material, wherein the maximum particle size of the granular material is 10 mm.

[0407] (2) The mixed material was put into a mold of a high-temperature device for hot-pressed sintering at a maximum temperature of 1700? C. The pressure was applied at this temperature with a hot-pressed strength of 4 MPa, and a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0408] The refractory material was analyzed by XRD, and the obtained phases were mainly corundum and CM2A8. Based on the percentage of the total mass of the refractory material, the phase content of CM2A8 was 62.5% and the phase content of zirconium oxide was 35%.

[0409] The resulting refractory material was analyzed by XRF and based on percentage of the total mass of the refractory material, the refractory material comprised 53.20% of Al.sub.2O.sub.3, 5.09% of MgO, 3.49% of CaO, and 35% of ZrO.sub.2.

[0410] The physical phase analysis of the matrix part of the refractory material was determined by micro-area diffraction using XRD, and the phase of matrix part of the refractory material mainly comprised 48.7% of CM2A8 phase content and 50% of zirconium oxide phase content.

[0411] The chemical composition of the matrix part of the refractory material comprised 41.2% of Al.sub.2O.sub.3, 4.02% of MgO, 2.71% of CaO, and 50% of ZrO.sub.2.

[0412] The bulk density of the refractory material was determined to be 3.20 g/cm.sup.3.

Example 11-1

[0413] (1) 718 g of tabular corundum fine powder and 300 g of CA6 granule material were mixed and stirred evenly to obtain a mixed material, wherein the maximum particle size of the granule material is 3 mm.

[0414] (2) The mixed material was put into a mold of a high temperature device for hot-pressed sintering. The maximum temperature was 1680? C. and the pressure was applied at this temperature. When the hot-pressed strength was 6 MPa, a calcium hexaaluminate based refractory material with the function of cleaning molten steel was prepared.

[0415] The refractory material was analyzed by XRD, and the obtained phases were mainly corundum and CA6. Based on the percentage of the total mass of the refractory material, in the refractory material, the phase content of corundum was 70% and the phase content of CA6 was 29.4%.

[0416] The refractory material obtained was analyzed by XRF and based on the percentage of the total mass of the refractory material, the refractory material comprised 97.13% of Al.sub.2O.sub.3 and 2.38% of CaO.

[0417] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD to obtain a corundum phase content of 100% in the matrix part of said refractory material.

[0418] The chemical composition of the matrix part of the refractory was 99.5% of Al.sub.2O.sub.3.

[0419] The bulk density of the refractory material was determined to be 3.20 g/cm.sup.3.

Example 12-1

[0420] (1) 710 g of tabular corundum fine powder and 300 g of CM2A8 granular material were mixed and stirred evenly to obtain a mixed material, wherein the maximum particle size of the granular material is 1 mm and the bulk density is 3.04 g/cm.sup.3.

[0421] (2) The mixed material was molded at normal temperature, then putting into a mold of a high-temperature device for hot-pressed sintering, increasing the pressure while the temperature was increased. When the temperature was heated up to 1750? C., and the maximum hot-pressed strength was 3.5 MPa, a calcium hexaaluminate refractory material with the function of cleaning molten steel was prepared.

[0422] The refractory material was analyzed by XRD, and the obtained phases were mainly corundum and CM2A8. Based on the percentage of the total mass of the refractory material, the phase content of corundum was 70%, and the phase content of CM2A8 was 28.1%.

[0423] The refractory material obtained was analyzed by XRF and based on the percentage of the total mass of the refractory material, the refractory material comprised 94.67% of Al.sub.2O.sub.3, 2.36% of MgO, and 1.60% of CaO.

[0424] The physical phase analysis of the matrix part of said refractory material was determined by micro-area diffraction using XRD, and the phase content of corundum in the matrix part of said refractory material was 100%.

[0425] The chemical composition of the matrix part of the refractory material comprised 99.5% of Al.sub.2O.sub.3.

[0426] The bulk density of the refractory material was determined to be 3.35 g/cm.sup.3.

TABLE-US-00002 TABLE 2 Physical phases, chemical composition and bulk density of examples and comparative example Mass ratio of the granule material to Chemical Bulk the fine Phase composition composition density powder and content and content (g/cm.sup.3) Example 1 65:35 CA6: 100% 91.05% Al.sub.2O.sub.3 3.20 8.40% CaO Example 2 40:60 CA6: 55% 79.3% Al.sub.2O.sub.3 3.25 Corundum: 28.5% 4.40% CaO ZrO.sub.2: 15% 15.0% ZrO.sub.2 Example 3 40:60 CA6: 68.6% 94.12% Al.sub.2O.sub.3 2.95 Corundum: 30% 5.0% CaO Example 4 50:50 CA6: 9.71% 77.5% Al.sub.2O.sub.3 3.20 C2M2A14: 28.4% 5.68% CaO CM2A8: 49.9% 5.43% MgO ZrO.sub.2: 9.46% 9.45% ZrO.sub.2 Example 5 60:40 CM2A8: 80% 78.0% Al.sub.2O.sub.3 3.10 Corundum: 9.48% 4.30% CaO ZrO.sub.2: 9.72% 6.72% MgO 9.60% ZrO.sub.2 Example 6 40:60 CM2A8: 83.8% 72.86% Al.sub.2O.sub.3 3.15 ZrO.sub.2: 15% 4.63% CaO 6.89% MgO 15% ZrO.sub.2 Example 7 40:60 CM2A8: 55% 76.1% Al.sub.2O.sub.3 3.28 Corundum: 30% 3.20% CaO ZrO.sub.2: 14.3% 4.52% MgO 14.5% ZrO.sub.2 Example 8 30:70 CM2A8: 63.7% 55.72% Al.sub.2O.sub.3 3.65 ZrO.sub.2: 35% 3.63% CaO 5.28% MgO 35% ZrO.sub.2 Example 9 50:50 C2M2A14: 100% 87.7% Al.sub.2O.sub.3 3.55 6.29% CaO 4.02% MgO Example 10 30:70 CM2A8: 100% 85.24% Al.sub.2O.sub.3 3.41 5.58% CaO 8.40% MgO Example 11 30:70 CA6: 28.2% 97.48% Al.sub.2O.sub.3 3.0 Corundum: 70% 2.38% CaO Example 12 30:70 CM2A8: 28.9% 94.67% Al.sub.2O.sub.3 2.90 Corundum: 68.35% 2.41% MgO 1.76% CaO Example 13 30:70 CM2A8: 80% 85.32% Al.sub.2O.sub.3 2.92 Corundum: 6.3% 8.38% MgO CA6: 3.7% 5.53% CaO CA2: 3.85% MA: 5.78% Example 14 40:60 CA6: 81.2% 75.58% Al.sub.2O.sub.3 3.20 ZrO.sub.2: 15% 6.75% CaO 15% ZrO.sub.2 Example 2-1 40:60 CA6: 52.5% 79.12% Al.sub.2O.sub.3 3.20 Corundum: 29.3% 4.16% CaO ZrO.sub.2: 14.8% 14.2% ZrO.sub.2 Example 3-1 40:60 CA6: 68.28% 94.10% Al.sub.2O.sub.3 3.20 Corundum: 30% 5.62% CaO Example 6-1 40:60 CM2A8: 82.5% 71.06% Al.sub.2O.sub.3 3.20 ZrO.sub.2: 15% 6.54% MgO 4.63% CaO 15% ZrO.sub.2 Example 7-1 40:60 CM2A8 52.5% 75.23% Al.sub.2O.sub.3 3.20 Corundum: 30% 4.18% MgO ZrO.sub.2: 14.43% 3.05% CaO 14.48% ZrO.sub.2 Example 8-1 30:70 CM2A8: 62.5% 53.20% Al.sub.2O.sub.3 3.20 ZrO.sub.2: 35% 5.09% MgO 3.49% CaO 35% ZrO.sub.2 Example 11-1 30:70 Corundum: 70% 97.13% Al.sub.2O.sub.3 3.20 CA6: 29.4% 2.38% CaO Example 12-1 30:70 CM2A8: 28.1% 94.67% Al.sub.2O.sub.3 3.35 Corundum: 70% 2.36% MgO 1.60% CaO Comparative 65:35 Corundum: 68.1% 89.6% Al.sub.2O.sub.3 3.10 Example 1 MA: 23.6% 6.78% MgO CA2 + CA: 4.74% 1.29% CaO Comparative 65:35 CA6: 68.9% 91.04% Al.sub.2O.sub.3 3.05 Example 1 Corundum: 24.3% 7.18% CaO CA2 + CA: 4.82%

Experimental Example

Static Slag Corrosion Test

[0427] The refractory material of Example 1 was prepared into a specimen of ?45 mm?90 mm, and a pit of ?30 mm?40 mm was drilled in the middle of the specimen to form a crucible for the molten steel smelting experiments. The deoxidation method was carried out using metallic aluminum deoxidation at a temperature of 1600? C. and an argon atmosphere, and the slag system was CaOAl.sub.2O.sub.3SiO.sub.2 system.

[0428] FIG. 1 shows a schematic diagram of the molten steel smelting based on the specimen of Example 1. FIG. 2 shows the microstructure of interface between the refractory material and the steel slag. It was confirmed by electron microscopy and XRD analysis that a metamorphic layer was formed at the interface, which can inhibit slag penetration and improve the size and properties of inclusions. The phases of this layer are mainly C12A7, CA2 and CA. In addition, it can be seen that the reaction interface and the transition layer of the material are very thin and the structure is homogeneous, fully indicating that the material has excellent resistance to slag penetration and slag erosion. For normal refractory materials, if the experiment is carried out in this way and with this wall thickness, the slag will completely penetrate into the crucible wall refractory material, which also shows the advantages of the refractory material of the present application over the current conventional refractory materials are very significant.

[0429] Table 3 shows the statistics of the inclusions in the steel over time after the smelting of aluminum-killed steel with the crucible prepared in Example 1. As seen from Table 3, the size distribution of inclusions in the steel gradually decreases over time, and the large-size inclusions, which are very damaging, are significantly reduced, and the effect is very obvious. This also shows that the effect of the refractory material in Example 1 on the cleanliness of the inclusions in the steel is still pronounced.

TABLE-US-00003 TABLE 3 Distribution of inclusions at different times of smelting Smelting Inclusion distribution/% time, min <5 ?m 5-10 ?m 10-15 ?m 15-20 ?m >20 ?m 0 49.26 38.98 10.23 1.53 0 30 24.47 69.35 5.37 0.81 0 30 36.71 63.29 0 0 0

[0430] Table 4 shows the statistics of inclusions in the steel, the total depth of slag erosion and penetration in steel after aluminum killed steel smelting with crucibles made of refractory materials in different examples and comparative examples, and the times of thermal shock stability of the refractory material prepared by different examples and comparative examples. The times of thermal shock stability was determined according to GB/T 30873-2014.

[0431] As seen from Table 4, the average size of the inclusions in the smelting of aluminum-killed steel based on the crucibles prepared from the refractory material of this example is relatively small, and the depths of slag erosion and slag penetration are relatively small, combining with thermal shock performance, etc. Specifically, the performances of the refractory materials of Examples 1, 2, 3, 14, 2-1 and 3-1 is optimal, the performances of the refractory materials of Examples 4, 5, 6, 7, 8, 6-1, 7-1, and 8-1 are better, and the performances of the refractory materials of Examples 9, 10, 11, 12, 13, 11-1, and 12-1 are the next better. Comparative example 1 (based on corundum-spinel castable, the most commonly used ladle working lining material at present), shows that the average size of the inclusions is 2.48 ?m and the area ratio is 7.52%. The average size of the inclusions in the steel is 2.45 ?m and the area ratio is 6.35% based on the refractory material prepared in Comparative Example 2 (CN107500747A). In contrast, the average size of the inclusions in the steel is 1.47 ?m and the area ratio is 5.89% of the steel based on the refractory material prepared in Example 1 of this application, with a significant improvement in the size of the inclusions, especially in the number of large inclusions.

TABLE-US-00004 TABLE 4 Inclusions and refractory material properties of smelted steel grades based on relevant specimens Total depth of slag Average Area corrosion and size proportion penetration Thermal shock Specimen (?m) (%) (mm) stability(times) Example 1 1.47 5.89 3.6 12 Example 2 1.85 5.93 3.4 14 Example 3 1.53 5.90 3.6 12 Example 4 1.92 5.92 4.0 13 Example 5 1.94 5.92 3.9 13 Example 6 1.95 5.89 3.8 12 Example 7 1.89 5.91 3.6 14 Example 8 1.78 5.88 3.1 7 Example 9 2.05 6.05 3.8 2 Example 10 2.11 6.12 4.1 3 Example 11 2.05 6.01 4.7 6 Example 12 2.17 6.18 5.1 8 Example 13 2.19 6.22 5.4 11 Example 14 1.49 5.82 3.63 13 Example 2-1 1.82 5.94 3.42 14 Example 3-1 1.51 5.87 3.48 9 Example 6-1 1.93 5.92 3.72 13 Example 7-1 1.89 5.92 3.69 14 Example 8-1 1.83 6.21 3.92 14 Example 11-1 1.99 6.00 4.78 6 Example 12-1 2.13 5.90 4.32 10 Comparative 2.48 7.52 15.6 2 Example 1 Comparative 2.45 6.35 12.8 9 Example 2

[0432] The above is only a preferred embodiment of the present application and is not intended to limit the application in other forms. Any person skilled in the art may make use of the technical content disclosed above to change or adapt it to equivalent embodiments with equivalent variations. However, any simple modifications, equivalent variations, and adaptations of the above embodiments based on the technical substance of this application, without departing from the content of the technical solution of this application, still fall within the scope of protection of the technical solution of this application.