An insulating monolithic refractory material having sufficient curing strength and usable time ensured and exhibiting excellent stability at high temperature. The insulating monolithic refractory material comprises a binder and a refractory raw material; a bulk specific gravity thereof is 0.8 to 1.8 when a kneaded mixture of the insulating monolithic refractory material with water is cured at normal temperature for 24 hours and then dried at 110 C. for 24 hours; the binder comprises a calcium aluminate cement including CaO and Al.sub.2O.sub.3 as chemical components and a strontium aluminate cement including SrO and Al.sub.2O.sub.3 as chemical components; and on the basis of 100% by mass as a total mass of the binder and the refractory raw material, a content of the strontium aluminate cement is 2 to 10% by mass, and a content of CaO derived from the calcium aluminate cement is 1 to 12% by mass.

An insulating monolithic refractory material having sufficient curing strength and usable time ensured and exhibiting excellent stability at high temperature. The insulating monolithic refractory material comprises a binder and a refractory raw material; a bulk specific gravity thereof is 0.8 to 1.8 when a kneaded mixture of the insulating monolithic refractory material with water is cured at normal temperature for 24 hours and then dried at 110 C. for 24 hours; the binder comprises a calcium aluminate cement including CaO and Al.sub.2O.sub.3 as chemical components and a strontium aluminate cement including SrO and Al.sub.2O.sub.3 as chemical components; and on the basis of 100% by mass as a total mass of the binder and the refractory raw material, a content of the strontium aluminate cement is 2 to 10% by mass, and a content of CaO derived from the calcium aluminate cement is 1 to 12% by mass.

An insulating monolithic refractory material having sufficient curing strength and usable time ensured and exhibiting excellent stability at high temperature. The insulating monolithic refractory material comprises a binder and a refractory raw material; a bulk specific gravity thereof is 0.8 to 1.8 when a kneaded mixture of the insulating monolithic refractory material with water is cured at normal temperature for 24 hours and then dried at 110 C. for 24 hours; the binder comprises a calcium aluminate cement including CaO and Al.sub.2O.sub.3 as chemical components and a strontium aluminate cement including SrO and Al.sub.2O.sub.3 as chemical components; and on the basis of 100% by mass as a total mass of the binder and the refractory raw material, a content of the strontium aluminate cement is 2 to 10% by mass, and a content of CaO derived from the calcium aluminate cement is 1 to 12% by mass.

A method of producing an additively manufactured casting mould for the production of components using the cold casting process or lamination process, comprising the steps of a) determining a three-dimensional structure of the casting mould, b) providing a mixture, the mixture comprising a binding agent and an aggregate, c) providing a printing fluid comprising an aqueous solution of magnesium chloride or magnesium sulfate, d) applying a layer of the mixture to a support, e) applying the printing fluid only to those parts of the mixture which are supposed to constitute a part of the casting mould, f) applying a further layer of the mixture to the previous layer of the mixture, g) applying the printing fluid only to those parts of the mixture which are supposed to constitute a part of the casting mould, h) repeating steps f) and g) until the desired shape of the casting mould is achieved, i) allowing those parts of the mixture to set which have been mixed with the aqueous solution of magnesium chloride or magnesium sulfate, j) removing the mixture which has not been mixed with an aqueous solution, and coating with a formwork skin at least those parts of the casting mould which come into contact with the material of the cold-casting lamination process.

A method of producing an additively manufactured casting mould for the production of components using the cold casting process or lamination process, comprising the steps of a) determining a three-dimensional structure of the casting mould, b) providing a mixture, the mixture comprising a binding agent and an aggregate, c) providing a printing fluid comprising an aqueous solution of magnesium chloride or magnesium sulfate, d) applying a layer of the mixture to a support, e) applying the printing fluid only to those parts of the mixture which are supposed to constitute a part of the casting mould, f) applying a further layer of the mixture to the previous layer of the mixture, g) applying the printing fluid only to those parts of the mixture which are supposed to constitute a part of the casting mould, h) repeating steps f) and g) until the desired shape of the casting mould is achieved, i) allowing those parts of the mixture to set which have been mixed with the aqueous solution of magnesium chloride or magnesium sulfate, j) removing the mixture which has not been mixed with an aqueous solution, and coating with a formwork skin at least those parts of the casting mould which come into contact with the material of the cold-casting lamination process.

Hydrophobic aggregates for use in refractory castables and gunning mixtures and methods of their preparation. The aggregates here are formed by crushing insulating fire brick and coating the resulting particles with a hydrophobic component. The hydrophobic component may be a polydimethylsiloxane having a terminal silanol group. As a result of the coating process, the coated aggregate has very low levels of alkalis. The aggregates may be used to form refractory castables that do not undergo substantial alkaline hydrolysis due to the reduced levels of alkalis. The castables made from these aggregates display superior physical properties, including lower water content, lower permanent linear change, high strength, and superior thermal conductivity/insulation properties, while at the same time possessing lower density and requiring less water to be used during castable formation. These improved properties also are observed in gunning mixtures formed from these aggregates.

Hydrophobic aggregates for use in refractory castables and gunning mixtures and methods of their preparation. The aggregates here are formed by crushing insulating fire brick and coating the resulting particles with a hydrophobic component. The hydrophobic component may be a polydimethylsiloxane having a terminal silanol group. As a result of the coating process, the coated aggregate has very low levels of alkalis. The aggregates may be used to form refractory castables that do not undergo substantial alkaline hydrolysis due to the reduced levels of alkalis. The castables made from these aggregates display superior physical properties, including lower water content, lower permanent linear change, high strength, and superior thermal conductivity/insulation properties, while at the same time possessing lower density and requiring less water to be used during castable formation. These improved properties also are observed in gunning mixtures formed from these aggregates.

A particulate sound absorption board and its preparation method. The said particulate sound absorption board consists of binding agent and sound absorption particle; the external surface of sound absorption particle is covered with a layer of binding agent, and the angularity coefficient of particle covered with binding agent is less than 1.3; the said sound absorption particle consists of skeleton particle and filling particle, in which the former is used for sound absorption board skeleton, and the latter flows into the pore between skeleton particles to form sound absorption pore, and the average diameter of cross section of sound absorption pore is 0.07 mm. The two-stage manufacturing technology (i.e. coating, curing and then shaping) is adopted for the said preparation method to prevent the pore between particles from being blocked by excess binding agent, and further improve the angularity coefficient of particle.

A particulate sound absorption board and its preparation method. The said particulate sound absorption board consists of binding agent and sound absorption particle; the external surface of sound absorption particle is covered with a layer of binding agent, and the angularity coefficient of particle covered with binding agent is less than 1.3; the said sound absorption particle consists of skeleton particle and filling particle, in which the former is used for sound absorption board skeleton, and the latter flows into the pore between skeleton particles to form sound absorption pore, and the average diameter of cross section of sound absorption pore is 0.07 mm. The two-stage manufacturing technology (i.e. coating, curing and then shaping) is adopted for the said preparation method to prevent the pore between particles from being blocked by excess binding agent, and further improve the angularity coefficient of particle.

Methods and compositions are provided that utilize high-alumina refractory aluminosilicate pozzolans in well cementing. An embodiment discloses a method of cementing comprising: introducing a cement composition into a subterranean formation, wherein the cement composition comprises; a component selected from the group consisting of cement kiln dust, Portland cement and any combination thereof; a high-alumina refractory aluminosilicate pozzolan; and water; and allowing the cement composition to set.