ALUMINUM-BASED ULTRA-THIN LAUNDER

Abstract

The present invention relates to the field of alloy-smelting facilities, and provides an aluminum-based ultra-thin launder. The launder has a body with a wall thickness of 12 mm to 25 mm. The body has a segmented structure, including a part of alloy in, a first launder, a second launder and a part of alloy out that are connected in sequence. The body of the launder provided in the present invention is lighter and thinner. The cost of production and use is reduced due to the significantly-decreased wall thickness and weight. The connection mode for components of the body is changed, which is beneficial to the replacement, and fundamentally lowers the risk of a repair material contaminating melted alloy.

Claims

1. An aluminum-based ultra-thin launder, wherein, the launder has a body with a wall thickness of 12 mm to 25 mm; and the body has a segmented structure, comprising a part of alloy in, a first launder, a second launder and a part of alloy out that are connected in sequence.

2. The aluminum-based ultra-thin launder according to claim 1, wherein the part of alloy in, the first launder, the second launder and the part of alloy out are connected via splicing or snapping connection.

3. The aluminum-based ultra-thin launder according to claim 1, wherein, the part of alloy in comprises a buffer zone and a direct-flow zone; and the buffer zone and the direct-flow zone are connected via a ramp.

4. The aluminum-based ultra-thin launder according to claim 3, wherein, an engaging groove is disposed in the direct-flow zone, and a filter plate is disposed in the engaging groove.

5. The aluminum-based ultra-thin launder according to claim 4, wherein a slag-blocking device is disposed on one side of the bottom of the engaging groove.

6. The aluminum-based ultra-thin launder according to claim 1, wherein, one end of the part of alloy out is closed, and the closed-end of the part of alloy out has an inclined surface.

7. The aluminum-based ultra-thin launder according to claim 2, wherein, one end of the part of alloy out is closed, and the closed-end of the part of alloy out has an inclined surface.

8. The aluminum-based ultra-thin launder according to claim 1, wherein the body of the launder has a bottom with an arc-shaped structure.

9. The aluminum-based ultra-thin launder according to claim 2, wherein the body of the launder has a bottom with an arc-shaped structure.

10. The aluminum-based ultra-thin launder according to claim 1, wherein, the body of the launder has a layered structure disposed with a refractory layer, a transition layer, a reinforcement layer and a protective layer in sequence from the inside to the outside; and the layered structure is prepared by coating.

11. The aluminum-based ultra-thin launder according to claim 10, wherein, the refractory layer has a thickness of 3 mm to 5 mm; the transition layer has a thickness of 2 mm; the reinforcement layer has a thickness of 5 mm to 15 mm; and the protective layer has a thickness of 2 mm to 3 mm.

12. The aluminum-based ultra-thin launder according to claim 10, wherein the refractory layer is made of white corundum, and the white corundum has a spherical or laminated structure.

13. The aluminum-based ultra-thin launder according to claim 11, wherein the refractory layer is made of white corundum, and the white corundum has a spherical or laminated structure.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0026] FIG. 1 is a schematic diagram of the planar structure of the aluminum-based ultra-thin launder of the present invention, where, 1 represents part of alloy in, 2 represents a first launder, 3 represents a second launder, and 4 represents a part of alloy out;

[0027] FIG. 2 is a three-dimensional structure diagram of the part of alloy in, where, 11 represents a buffer zone, 12 represents a direct-flow zone, 13 represents a closed end surface of the part of alloy in, 14 represents an engaging groove, and 15 represents a slag-blocking device;

[0028] FIG. 3 is a three-dimensional structure diagram of the first launder;

[0029] FIG. 4 is a three-dimensional structure diagram of the second launder, where, 31 represents an engaging groove;

[0030] FIG. 5 is a three-dimensional structure diagram of the part of alloy out, where, 41 represents a steel-discharging port, 42 represents an engaging groove, and 43 represents a closed end surface of the part of alloy out;

[0031] FIG. 6 is a schematic diagram of the snapping connection for the aluminum-based ultra-thin launder of the present invention;

[0032] FIG. 7 is a left view of the direct-flow zone 12 in FIG. 2, where, 14 represents an engaging groove, 15 represents a slag-blocking device, and 16 represents a filter plate; and

[0033] FIG. 8 is an enlarged partial view of part a of the side wall of the launder body in FIG. 7.

DETAILED DESCRIPTION

[0034] The technical solutions in the examples of the present invention are clearly and completely described below with reference to the accompanying drawings in the examples of the present invention. Apparently, the described examples are merely a part rather than all of the examples of the present invention. All other examples obtained by a person of ordinary skill in the art based on the examples of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] The present invention provides an aluminum-based ultra-thin launder, with a structure shown in FIG. 1. The launder has a body with a wall thickness of 12 mm to 25 mm; and the body has a segmented structure, including a part of alloy in 1, a first launder 2, a second launder 3 and a part of alloy out 4 that are connected in sequence. The present invention has no special limitation on the dimensions of the part of alloy in 1, the first launder 2, the second launder 3 and the part of alloy out 4, which can be adjusted to adapt to the industrial production.

[0036] The body of the launder provided in the present invention has a thickness of 12 mm to 25 mm, and preferably of 20 mm to 25 mm. In the present invention, the aluminum-based ultra-thin launder has a wall thickness only about ⅓ of that of an integrally-formed aluminum-based launder. During the industrial production process, it is dedicated to reducing the volume and weight of the launder as much as possible on the basis of no cracking at high temperature, and in addition to changing the material, reducing the wall thickness is the best option. The present invention, by designing the body of the launder as a segmented structure, reduces the wall thickness of the body and eliminates the defect that the body is prone to crack under excessive internal stress, which meets the need for light, thin and portable smelting facilities in industrial production.

[0037] In the present invention, the part of alloy in 1 has a structure shown in FIG. 2, including a buffer zone 11 and a direct-flow zone 12. The buffer zone 11 and the direct-flow zone 12 are connected via a ramp (see FIG. 2), and the buffer zone 11 has an area larger than that of the direct-flow zone 12, so as to alleviate the sputtering occurred when melted alloy is poured. In the present invention, one end of the buffer zone 11 is closed, and the closed end surface 13 is an irregular and smooth inclined surface, which has an angle of inclination with the bottom surface of the launder body, preferably of 100° to 120°. Since the closed end surface 13 of the present invention is an inclined surface, when melted alloy is poured into the launder, the sputtering of the liquid can be effectively avoided due to the angle of inclination. In the present invention, the top cross section of the buffer zone 11 is a trapezoid, and the upper plane of the trapezoid has an included angle preferably of 120° to 150°.

[0038] In the present invention, an engaging groove 14 and a slag-blocking device 15 are disposed in the direct-flow zone 12. In the present invention, the engaging groove 14 includes a left engaging groove and a right engaging groove, which are disposed on two sides of the inner wall of the groove, respectively, and there is a gap at the intersection of the left and right engaging grooves to facilitate the flow of melted alloy at the bottom. A filter plate 16 is disposed in engaging groove 14, and the filter plate 16 has a structure shown in FIG. 7. The filter plate 16 can block the slags in melted alloy when the melted alloy flows through the direct-flow zone, and thus prevents the slags from flowing to the subsequent processes. In the present invention, the slag-blocking device 15 is disposed on one side of the bottom of the engaging groove 14. As there is a gap at the bottom of the engaging groove 14, part of the deposited large-particle slags may flow through the gap. Therefore, the slag-blocking device 15 is disposed to further block the slags.

[0039] In the present invention, the first launder 2 has a structure shown in FIG. 3, and the second launder 3 has a structure shown in FIG. 4. In the present invention, the first launder 2 and the second launder 3 have the same length, width and span. During a specific implementation of the present invention, the first launder and the second launder have a span independently of 120 mm, a height independently of 25 mm, and a wall thickness independently of 25 mm. In the present invention, an engaging groove 31 is disposed in the second launder 3. In an embodiment of the present invention, a filter plate is disposed in the engaging groove 31. In another embodiment of the present invention, a restrictor plate is disposed in the engaging groove 31. The restrictor plate includes an upper blocking plate and a lower filter plate. The restrictor plate is disposed to gather the slags that are not blocked in the previous process in the upper area of the second launder, which enables the unified cleaning, the multi-blocking, and the deep purification of the melted alloy.

[0040] In the present invention, the part of alloy out 4 has a structure shown in FIG. 5, one end of the part of alloy out 4 is closed, and the closed end surface 43 is an inclined surface, with an angle of inclination preferably of 100° to 150°. In the present invention, a steel-runner port 41 and an engaging groove 42 are disposed in sequence on the left side of the closed end surface 43.

[0041] In the present invention, the part of alloy in 1, the first launder 2, the second launder 3 and the part of alloy out 4 are preferably connected via splicing or snapping connection.

[0042] In the present invention, when the connection mode is splicing connection, the splicing surface among components 1 to 4 of the launder is a smooth surface, and has an angle preferably of 45°/135°. In an embodiment of the present invention, the spliced launder is preferably used in combination with a supporting thermostable housing. The thermostable housing is wrapped around the launder. The spliced launder is fastened by the housing to compensate for the poor stability of the spliced launder, thereby avoiding the outflow of melted alloy. In another embodiment of the present invention, the spliced launder is preferably sealed from the outside using thermostable mud to improve the stability of the launder. The present invention has no special limitation on the material of the thermostable housing and the thermostable glue, and conventional thermostable materials and thermostable mud (resisting a temperature greater than the melting temperature of melted alloy) in the art may be used.

[0043] In the present invention, when the connection mode is snapping connection, the present invention preferably adopts a snapping structure shown in FIG. 6 for connection. In an embodiment of the present invention, taking the first and second launders as examples, when one end surface of the first launder 2 is convex, the end surface of the second launder 3 connected thereto is concave, and the angle of inclination in the recess is preferably of 10° to 30°. If the angle of inclination in the recess is too large, the protrusion has a longer external extension, and fracturing tends to occur at sharp corners when the launder is assembled. Therefore, the arrangement of small angles can effectively avoid the external extension of the protrusion, and thus reduce the possibility of fracturing at the sharp corners.

[0044] In the present invention, the bottom of the body of the launder preferably has an arc-shaped structure, which is lighter than that disclosed in Chinese patent CN205526168U, and is not prone to break due to no edges and corners. Moreover, the present invention adopts a segmented structure. Compared with a T-shaped structure, the arc-shaped structure exhibits an internal stress that is eliminated to a certain extent, and the launder body will not crack when being used at high temperature.

[0045] In the present invention, as shown in FIG. 8, the body of the launder has a layered structure disposed with a refractory layer 6, a transition layer 5, a reinforcement layer and a protective layer 3 in sequence from the inside to the outside. The reinforcement layer includes a first reinforcement layer 2, a second reinforcement layer 4, and a metal mesh 1 disposed between the first and second reinforcement layers; and the first reinforcement layer 2 and the second reinforcement layer 4 are symmetrical with respect to the metal mesh.

[0046] In the present invention, the layered structure is prepared by coating. In the present invention, the layers are prepared by coating. The material for each layer is made into a slurry in advance, and then added with a thermostable and refractory aluminum oxide material having a smaller particle size to obtain the raw material for each layer. Depending on the requirements for thickness, the refractory layer, the transition layer, the reinforcement layer and the protective layer are continuously and repeatedly coated and dried (that is, the next layer is coated after the last layer is dried). Since the layered structure formed by coating is more compact, and the stress transformation point can be further broken through after the high-temperature sintering is conducted, the stress in each layered structure can be basically compensated and released. Owing to the layer-by-layer bonding method, even if the thickness of the reinforcement layer is reduced, the stratification and fracture does not tend to occur at high temperature.

[0047] In the present invention, the refractory layer has a thickness preferably of 3 mm to 5 mm; the transition layer has a thickness preferably of 2 mm; the reinforcement layer has a thickness preferably of 5 mm to 15 mm; and the protective layer has a thickness preferably of 2 mm to 3 mm. The first reinforcement layer and the second reinforcement layer have the same thickness, preferably of 2 mm to 7 mm independently; the metal mesh 1 has a thickness preferably of 1 mm; and the first reinforcement layer 2 and the second reinforcement layer 4 are preferably bonded to the metal mesh 1 using silica sol.

[0048] In the present invention, the refractory layer 6 preferably adopts white corundum, and the white corundum preferably has a spherical or laminated structure; the transition layer 5 and the protective layer 3 preferably adopt a refractory oxide material independently; the first reinforcement layer 2 and the second reinforcement layer 4 preferably adopt heavy clay independently. The white corundum used for the refractory layer of the present invention can not only improve the refractory performance, but also can withstand the flushing of melted alloy steel due to the excellent thermal shock-resistance of white corundum. Due to the material properties and preparation process, the expansion stress after heat exposure is reduced, which can reduce the partial internal stress in the launder body, and thus can reduce the reinforcement layers. In case where the thickness of the launder body is reduced, cracking will not occur.

Example 1

[0049] An aluminum-based ultra-thin launder: The body of the launder has a segmented structure, including a part of alloy in 1, a first launder 2, a second launder 3 and a part of alloy out 4 that are connected in sequence. The components of the launder are connected via 45°/135° smooth surfaces. The launder body has a layered structure from the inner wall to the outside, and specifically, the layered structure shown in FIG. 8. From the inner wall of the launder to the outside, there are a refractory layer 6, a transition layer 5, a second reinforcement layer 4, a metal mesh 1, a first reinforcement layer 2 and a protective layer 3 in sequence. The above-mentioned layered structure is prepared by coating. The refractory layer 6, the transition layer 5, the reinforcement layers and the protective layer 3 are all made of a refractory material. The refractory layer 6 is made of spherical or laminated white corundum; the transition layer 5 and the protective layer 3 are made of a refractory oxide material; the reinforcement layers are made of heavy clay; and the metal mesh is made of copper metal. The refractory layer 6 has a thickness of 5 mm; the transition layer 5 has a thickness of 2 mm, the reinforcement layer has a thickness of 15 mm (the first reinforcement layer has a thickness of 7 mm+the metal mesh has a thickness of 1 mm+the second reinforcement layer has a thickness of 7 mm); and the protective layer 3 has a thickness of 3 mm.

Example 2

[0050] An aluminum-based ultra-thin launder: The body of the launder has a segmented structure, including a part of alloy in 1, a first launder 2, a second launder 3 and a part of alloy out 4 that are connected in sequence. The components of the launder are connected via the snapping manner shown in FIG. 6. The launder body has a layered structure from the inner wall to the outside, and specifically, the layered structure shown in FIG. 8. From the inside to the outside, there are a refractory layer 6, a transition layer 5, a second reinforcement layer 4, a metal mesh 1, a first reinforcement layer 2 and a protective layer 3 in sequence. The above-mentioned layered structure is prepared by coating. The refractory layer 6, the transition layer 5, the reinforcement layers and the protective layer 3 are all made of a refractory material. The refractory layer 6 is made of spherical or laminated white corundum; the transition layer 5 and the protective layer 3 are made of a refractory oxide material; the reinforcement layers are made of heavy clay; and the metal mesh is made of copper metal. The refractory layer 6 has a thickness of 5 mm; the transition layer 6 has a thickness of 2 mm, the reinforcement layer has a thickness of 15 mm (the first reinforcement layer has a thickness of 7 mm+the metal mesh has a thickness of 1 mm+the second reinforcement layer has a thickness of 7 mm); and the protective layer 3 has a thickness of 3 mm.

Comparative Example 1

[0051] This comparative example is different from Example 1 mainly in that the aluminum-based ultra-thin launder was integrally formed instead of a segmented structure.

[0052] The results of the specification and property tests for the launder prepared in Example 1 of the present invention are as follows:

TABLE-US-00001 Thermal conductivity Flexural Compressive at room strength strength temperature Density Properties (MPa) (MPa) (W/m .Math. K) (g/cm.sup.3) Porosity Example 1 7.37 17 0.48873 2.2 17.35%

Example 3

[0053] The casting experiment was conducted with the aluminum-based ultra-thin launder products produced in Example 1 and Comparative Example 1:

[0054] Casting amount: 4,000 kg of melted cobalt-chromium-nickel-based alloy steel at high temperature

[0055] Casting temperature: 1,450° C. to 1,570° C., and Casting time: 20 min

[0056] Casting Process:

[0057] 1) The components of the launder were preheated for 8 h to 10 h at a preheating temperature≥1,000° C., and then the launder was assembled as shown in FIG. 1; and

[0058] 2) More than 4,000 kg of melted cobalt-chromium-nickel-based alloy steel at high temperature was poured into the assembled launder, and then sent to the casting process through the launder.

[0059] Experimental results: It was found from observation that during a one-time process from use to the end, the launder product in Example 1 showed no cracking, peeling, chipping and slagging conditions, and withstood the flushing; and the first launder area exhibited an excellent slag-blocking effect, which could effectively improve the purity of the melted alloy, increase the yield of products downstream, comprehensively improve the physical and chemical parameters of the product, and increase the recovery rate of residual steel.

[0060] Recycling Experiment:

[0061] After being recycled for 3 times, the integrally-formed launder of Comparative Example 1 cracked first, while the launder of Example 1 had no obvious cracks.

[0062] After being recycled for 7 times, the launder in Example 1 cracked, and the launder in Comparative Example 1 was repaired for further use.

[0063] After being recycled for 15 times, the part of alloy in in Example 1 needed to be replaced; and the launder in Comparative Example 1 showed more cracks, and in order to ensure the purity of the melted alloy, the launder was no longer repaired for use.

[0064] Specific examples are used herein for illustration of the principles and implementations of the present invention. The description of the examples is used to help understand the method and its core principles of the present invention. In addition, those skilled in the art can make various modifications to specific implementations and application scope in accordance with the teachings of the present invention. In conclusion, the content of this specification shall not be construed as a limitation to the present invention.