CN112279657B - Lightweight bauxite-based refractory brick and preparation method thereof - Google Patents
Lightweight bauxite-based refractory brick and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a lightweight bauxite-based refractory brick and a preparation method thereof. The technical scheme is as follows: using 50-65 wt% of light-weight alumina clinker particles as aggregate, 4-10 wt% of fused magnesia fine powder, 12-18 wt% of light-weight alumina clinker fine powder and 8-14 wt% of magnesium-aluminum spinelFine stone powder and 6-12 wt% of alpha-Al2O3The micro powder is used as a base material; firstly, uniformly mixing the matrix material, then adding the uniformly mixed matrix material into the aggregate, and uniformly mixing; then adding a binding agent accounting for 2-6 wt% of the sum of the aggregate and the matrix material, mixing and grinding, pressing and forming, drying for 20-36 hours at the temperature of 110-200 ℃, and preserving heat for 1-8 hours at the temperature of 1400-1600 ℃ to prepare the lightweight bauxite-based refractory brick. The lightweight bauxite-based refractory brick prepared by the method has the characteristics of high strength, good thermal shock resistance, strong slag erosion resistance and long service life.
Description
Technical Field
The invention belongs to the technical field of alumina-based refractory bricks. In particular to a light-weight alumina-based refractory brick and a preparation method thereof.
Background
The refractory material is directly applied to the high-temperature kiln in the high-temperature industrial production process in various fields of steel, non-ferrous metal, cement, glass, ceramics, chemical industry, machinery, electric power and the like, the technical progress of the refractory material and the technical progress of the high-temperature kiln are mutually influenced and promoted, only the continuous research and application of high-quality refractory material can be realized, the superiority of high efficiency, energy conservation and low pollution of the high-temperature kiln, and the new technological process has practical use value.
The lightweight refractory material is one of important development directions of the refractory material, and the closer the refractory material is to the high-temperature working surface of an industrial furnace, the more remarkable the heat insulation and preservation effect is, so that the development of the lightweight refractory material which can be directly used in the working layer, especially the lightweight bauxite-based refractory material, has great significance for energy conservation and emission reduction of the whole high-temperature industry.
At present, certain research is carried out at home and abroad aiming at the light weight of the alumina refractory material. For example, in the patent of "corrosion-resistant microporous bauxite lightweight refractory brick and process for producing the same" (CN 107954740 a), the process comprises preparing a refractory brick substrate from bauxite chamotte, metakaolin ultrafine powder, hollow glass beads, expanded graphite, fly ash and paper slurry water, and coating the substrate with a high-temperature coating to obtain the corrosion-resistant microporous bauxite lightweight refractory brick, but when the working layer is used, the strength of the material is low, and the slag invasion resistance is highThe etching performance is not good. In addition, for example, the patent technology of 'micropore bauxite chamotte light-weight refractory brick and preparation method thereof' (CN 107954739A) adopts bauxite chamotte large particles, calcium aluminate fine powder, kaolin ultrafine powder and Al2O3The micro-powder, the silicon micro-powder, the pore-forming agent, the micro-fine silica aerogel and the pore-forming agent are used as raw materials, and although the microporous bauxite clinker light-weight refractory brick is prepared, when the material is used in a working layer, the mechanical strength and the slag corrosion resistance of the material are poor, and the service life is short. Also, for example, the influence of different lightweight aggregates on the performance of high-alumina casting materials [ J]The refractory material 2012,46(006): 446-449) is prepared from lightweight high-strength microporous alumina aggregate, and the alumina-based high-alumina castable material has poor thermal shock resistance and slag corrosion resistance and short service life.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a light-weight bauxite-based refractory brick with high strength, good thermal shock resistance, strong slag erosion resistance and long service life and a preparation method thereof.
In order to realize the task, the technical scheme adopted by the invention is as follows: taking 50-65 wt% of light-weight alumina clinker particles as aggregate, 4-10 wt% of fused magnesia fine powder, 12-18 wt% of light-weight alumina clinker fine powder, 8-14 wt% of magnesia-alumina spinel fine powder and 6-12 wt% of alpha-Al2O3The micro powder is used as a base material; firstly, uniformly mixing the matrix material, then adding the uniformly mixed matrix material into the aggregate, and uniformly mixing; then adding a binding agent accounting for 2-6 wt% of the sum of the aggregate and the matrix material, mixing and grinding, pressing and forming, drying for 20-36 hours at the temperature of 110-200 ℃, and preserving heat for 1-8 hours at the temperature of 1400-1600 ℃ to prepare the lightweight bauxite-based refractory brick.
The preparation method of the light-weight alumina clinker particles and the light-weight alumina clinker fine powder comprises the following steps: putting 89-97 wt% of bauxite raw material micro powder, 1-9 wt% of carbon black and 0.1-4 wt% of plant ash into a planetary ball mill, uniformly mixing, performing mechanical compression molding under the condition of 100-200 MPa, drying for 12-36 hours at the temperature of 110-200 ℃, and then preserving heat for 3-8 hours at the temperature of 1550-1750 ℃ under the condition of carbon embedding to obtain the lightweight bauxite clinker. And finally crushing and screening the light-weight alumina clinker to obtain light-weight alumina clinker particles and light-weight alumina clinker fine powder.
The volume density of the light-weight alumina clinker is 2.7-3.2 g/cm3The average pore diameter is 100 to 500 nm.
The particle size of the light-weight alumina clinker particles is 0.088-8 mm, and the particle size of the light-weight alumina clinker fine powder is less than 0.088 mm.
The MgO content of the fused magnesia fine powder is more than 97 wt%; the grain diameter of the fused magnesia fine powder is less than 74 mu m.
Al of the magnesia-alumina spinel micropowder2O3Content (wt.)>72 wt%; particle size D of magnesia-alumina spinel micropowder50Less than 6 μm.
The alpha-Al2O3Micronized Al2O3Content (wt.)>99wt％；α-Al2O3Particle diameter D of the micropowder50Less than 3.5 μm.
The binding agent is one of aluminum dihydrogen phosphate, phenolic resin and binding clay.
Al of the alumina raw material micro powder2O3The content is more than or equal to 60 wt%; particle diameter D of alumina raw material micropowder501 to 10 μm.
The C content of the carbon black is more than or equal to 99 wt%; the grain diameter of the carbon black is less than or equal to 100 nm.
The grain size of the plant ash is less than or equal to 10 mu m.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
(1) in the preparation process of the light-weight alumina clinker introduced by the invention, the potassium oxide formed by decomposing the plant ash through heat treatment can rapidly form a liquid phase with silicon dioxide and other impurities in the alumina at high temperature, and small-particle iron and silicon can be separated out in a carbon-buried reducing atmosphere. Under the catalytic action of the small-particle iron, the small-particle silicon reacts with the carbon black to generate the silicon carbide crystal whisker in situ; in addition, the existence of the silicon carbide whiskers in the light-weight alumina clinker particles and the fine powder introduced by the invention can improve the mechanical strength and the thermal shock resistance of the light-weight alumina-based refractory brick.
(2) The fused magnesia fine powder and the alpha-Al are introduced into the matrix material2O3The micro powder can react in situ to form spinel, and forms a multi-stage spinel structure with the spinel micro powder in the matrix material, so that Fe and Mn elements can be captured during the reaction with the slag, and the viscosity of the slag is increased; meanwhile, the silicon carbide whiskers in the light-weight alumina clinker particles and the fine powder introduced by the invention can also delay the erosion and penetration of slag to materials; therefore, the slag erosion resistance of the lightweight alumina-based refractory brick can be improved.
(3) The lightweight bauxite-based refractory brick prepared by the method has high mechanical strength, excellent thermal shock resistance and strong slag erosion resistance, so that the service life of the lightweight bauxite-based refractory brick in service of a working layer of a high-temperature industrial furnace can be obviously prolonged.
The light-weight alumina-based refractory brick prepared by the invention is detected as follows: the breaking strength is 25-40 MPa; the breaking strength retention rate after water cooling at 1100 ℃ for five times is 28-38%; the corrosion index of a slag resistance experiment of a 1600 ℃ static crucible method is 6-17%, and the permeability index is 25-50%; the service life of the steel ladle is 170-220 times when the steel ladle is applied to 200t refining.
Therefore, the lightweight bauxite-based refractory brick prepared by the method has the characteristics of high strength, good thermal shock resistance, strong slag erosion resistance and long service life.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting the scope of protection.
A light-weight alumina-based refractory brick and a preparation method thereof. Using 50-65 wt% of light-weight alumina clinker particles as aggregate, 4-10 wt% of fused magnesia fine powder, 12-18 wt% of light-weight alumina clinker fine powder, 8-14 wt% of spinel fine powder and 6-12 wt% of alpha-Al2O3The micro powder is used as a base material; firstly, uniformly mixing the matrix material, then adding the uniformly mixed matrix material into the aggregate, and uniformly mixing; then adding a bonding agent accounting for 2-6 wt% of the aggregate and the matrix material, mixing and grinding, pressing and forming, drying for 20-36 hours at the temperature of 110-200 ℃, and drying at the temperature of 1400-1600 DEG CAnd preserving heat for 1-8 hours to obtain the lightweight bauxite-based refractory brick.
The preparation method of the light-weight alumina clinker particles and the light-weight alumina clinker fine powder comprises the following steps: putting 89-97 wt% of bauxite raw material micro powder, 1-9 wt% of carbon black and 0.1-4 wt% of plant ash into a planetary ball mill, uniformly mixing, performing mechanical compression molding under the condition of 100-200 MPa, drying for 12-36 hours at the temperature of 110-200 ℃, and then preserving heat for 3-8 hours at the temperature of 1550-1750 ℃ under the condition of carbon embedding to obtain the lightweight bauxite clinker. And finally crushing and screening the light-weight alumina clinker to obtain light-weight alumina clinker particles and light-weight alumina clinker fine powder.
In this embodiment:
the volume density of the light-weight alumina clinker is 2.7-3.2 g/cm3The average pore diameter is 100 to 500 nm.
The particle size of the light-weight alumina clinker particles is 0.088-8 mm, and the particle size of the light-weight alumina clinker fine powder is less than 0.088 mm.
The MgO content of the fused magnesia fine powder is more than 97 wt%; the grain diameter of the fused magnesia fine powder is less than 74 mu m.
Al of the magnesia-alumina spinel micropowder2O3Content (wt.)>72 wt%; particle size D of magnesia-alumina spinel micropowder50Less than 6 μm.
The alpha-Al2O3Micronized Al2O3Content (wt.)>99wt％；α-Al2O3Particle diameter D of the micropowder50Less than 3.5 μm.
Al of the alumina raw material micro powder2O3The content is more than or equal to 60 wt%; particle diameter D of alumina raw material micropowder501 to 10 μm.
The C content of the carbon black is more than or equal to 99 wt%; the grain diameter of the carbon black is less than or equal to 100 nm.
The grain size of the plant ash is less than or equal to 10 mu m.
The detailed description is omitted in the embodiments.
Example 1
A light-weight alumina-based refractory brick and a preparation method thereof. 50 wt% of light-weight alumina clinker particles are used as aggregate, 10 wt% of fused magnesia fine powder and 18 wt% of fused magnesia fine powder are used as aggregateFine powder of light-weight alumina clinker, 10 wt% of spinel fine powder and 12 wt% of alpha-Al2O3The micro powder is used as a base material; firstly, uniformly mixing the matrix material, then adding the uniformly mixed matrix material into the aggregate, and uniformly mixing; then adding a binding agent accounting for 4 wt% of the total weight of the aggregate and the matrix material, mixing and grinding, pressing and forming, drying for 36 hours at the temperature of 110 ℃, and preserving heat for 8 hours at the temperature of 1400 ℃ to obtain the lightweight bauxite-based refractory brick.
The preparation method of the light-weight alumina clinker particles and the light-weight alumina clinker fine powder comprises the following steps: putting 89 wt% of alumina raw material micro powder, 9 wt% of carbon black and 2 wt% of plant ash into a planetary ball mill, uniformly mixing, performing mechanical compression molding under the condition of 200MPa, drying for 12 hours at the temperature of 200 ℃, and then preserving heat for 8 hours at the temperature of 1550 ℃ and under the condition of carbon embedding to obtain the lightweight alumina clinker. And finally crushing and screening the light-weight alumina clinker to obtain light-weight alumina clinker particles and light-weight alumina clinker fine powder.
The binding agent is aluminum dihydrogen phosphate.
The lightweight bauxite-based refractory brick prepared in the embodiment is detected as follows: the breaking strength is 25-40 MPa; the breaking strength retention rate is 28 percent after water cooling at 1100 ℃ for five times; the corrosion index of a slag resistance experiment of a 1600 ℃ static crucible method is 16 percent, and the permeability index is 48 percent; the service life of the steel ladle applied to 200t refining is 173 times.
Example 2
A light-weight alumina-based refractory brick and a preparation method thereof. 53 wt% of light-weight alumina clinker particles are used as aggregate, 8 wt% of fused magnesia fine powder, 13 wt% of light-weight alumina clinker fine powder, 14 wt% of spinel fine powder and 12 wt% of alpha-Al2O3The micro powder is used as a base material; firstly, uniformly mixing the matrix material, then adding the uniformly mixed matrix material into the aggregate, and uniformly mixing; then adding a binding agent accounting for 3 wt% of the sum of the aggregate and the matrix material, mixing and grinding, pressing and forming, drying for 28 hours at the temperature of 150 ℃, and preserving heat for 3 hours at the temperature of 1600 ℃ to obtain the lightweight bauxite-based refractory brick.
The preparation method of the light-weight alumina clinker particles and the light-weight alumina clinker fine powder comprises the following steps: putting 90 wt% of alumina raw material micro powder, 6 wt% of carbon black and 4 wt% of plant ash into a planetary ball mill, uniformly mixing, performing mechanical compression molding under the condition of 180MPa, drying for 24 hours at 160 ℃, and then preserving heat for 6 hours at 1650 ℃ and under the condition of carbon embedding to obtain the lightweight alumina clinker. And finally crushing and screening the light-weight alumina clinker to obtain light-weight alumina clinker particles and light-weight alumina clinker fine powder.
The binding agent is phenolic resin.
The lightweight bauxite-based refractory brick prepared in the embodiment is detected as follows: the breaking strength is 25-40 MPa; the breaking strength retention rate is 29 percent after water cooling for five times at 1100 ℃; the corrosion index of a slag resistance experiment of a 1600 ℃ static crucible method is 12 percent, and the permeability index is 42 percent; the service life of the steel ladle is 186 times when the steel ladle is applied to 200t refining.
Example 3
A light-weight alumina-based refractory brick and a preparation method thereof. 55 wt% of light-weight alumina clinker particles are used as aggregate, 10 wt% of fused magnesia fine powder, 15 wt% of light-weight alumina clinker fine powder, 14 wt% of spinel fine powder and 6 wt% of alpha-Al2O3The micro powder is used as a base material; firstly, uniformly mixing the matrix material, then adding the uniformly mixed matrix material into the aggregate, and uniformly mixing; then adding a binding agent accounting for 5 wt% of the sum of the aggregate and the matrix material, mixing and grinding, pressing and forming, drying for 30 hours at the temperature of 110 ℃, and preserving heat for 6 hours at the temperature of 1450 ℃ to prepare the lightweight bauxite-based refractory brick.
The preparation method of the light-weight alumina clinker particles and the light-weight alumina clinker fine powder comprises the following steps: putting 93 wt% of alumina raw material micro powder, 5 wt% of carbon black and 2 wt% of plant ash into a planetary ball mill, uniformly mixing, performing mechanical compression molding under the condition of 150MPa, drying for 24 hours at the temperature of 140 ℃, and then preserving heat for 7 hours at the temperature of 1550 ℃ and under the condition of carbon embedding to obtain the lightweight alumina clinker. And finally crushing and screening the light-weight alumina clinker to obtain light-weight alumina clinker particles and light-weight alumina clinker fine powder.
The binder binds the clay.
The lightweight bauxite-based refractory brick prepared in the embodiment is detected as follows: the breaking strength is 25-40 MPa; the breaking strength retention rate is 31 percent after water cooling at 1100 ℃ for five times; the corrosion index of a slag resistance experiment of a 1600 ℃ static crucible method is 11 percent, and the permeability index is 37 percent; the service life of the steel ladle applied to 200t refining is 195 times.
Example 4
A light-weight alumina-based refractory brick and a preparation method thereof. 58 wt% of light-weight alumina clinker particles are used as aggregate, 6 wt% of fused magnesia fine powder, 12 wt% of light-weight alumina clinker fine powder, 12 wt% of spinel fine powder and 12 wt% of alpha-Al2O3The micro powder is used as a base material; firstly, uniformly mixing the matrix material, then adding the uniformly mixed matrix material into the aggregate, and uniformly mixing; then adding a binding agent accounting for 5 wt% of the total weight of the aggregate and the matrix material, mixing and grinding, pressing and forming, drying for 20 hours at the temperature of 200 ℃, and preserving heat for 3 hours at the temperature of 1500 ℃ to prepare the lightweight bauxite-based refractory brick.
The preparation method of the light-weight alumina clinker particles and the light-weight alumina clinker fine powder comprises the following steps: putting 92 wt% of alumina raw material micro powder, 3 wt% of carbon black and 5 wt% of plant ash into a planetary ball mill, uniformly mixing, performing mechanical compression molding under the condition of 130MPa, drying for 30 hours at the temperature of 130 ℃, and then preserving heat for 4 hours at the temperature of 1650 ℃ and under the condition of carbon embedding to obtain the lightweight alumina clinker. And finally crushing and screening the light-weight alumina clinker to obtain light-weight alumina clinker particles and light-weight alumina clinker fine powder.
The binding agent is phenolic resin.
The lightweight bauxite-based refractory brick prepared in the embodiment is detected as follows: the breaking strength is 25-40 MPa; the breaking strength retention rate is 32% after water cooling at 1100 ℃ for five times; the corrosion index of a slag resistance experiment of a 1600 ℃ static crucible method is 11 percent, and the permeability index is 32 percent; the service life of the steel ladle is 206 times when the steel ladle is applied to 200t refining.
Example 5
A light-weight alumina-based refractory brick and a preparation method thereof. 60 wt% of light-weight alumina clinker particles are used as aggregate, 4 wt% of fused magnesia fine powder, 16 wt% of light-weight alumina clinker fine powder, 12 wt% of spinel fine powder and 8 wt% of alpha-Al2O3The micro powder is used as a base material; firstly, uniformly mixing the matrix material, and then uniformly mixingAdding the matrix material into the aggregate, and uniformly mixing; then adding a bonding agent accounting for 2 wt% of the aggregate and the matrix material, mixing and grinding, pressing and forming, drying for 28 hours at 160 ℃, and preserving heat for 5 hours at 1500 ℃ to obtain the lightweight bauxite-based refractory brick.
The preparation method of the light-weight alumina clinker particles and the light-weight alumina clinker fine powder comprises the following steps: putting 95 wt% of alumina raw material micro powder, 1 wt% of carbon black and 4 wt% of plant ash into a planetary ball mill, uniformly mixing, performing mechanical compression molding under the condition of 160MPa, drying for 16 hours at 180 ℃, and then preserving heat for 3 hours at 1700 ℃ under the condition of carbon embedding to obtain the lightweight alumina clinker. And finally crushing and screening the light-weight alumina clinker to obtain light-weight alumina clinker particles and light-weight alumina clinker fine powder.
The binder is a bound clay.
The lightweight bauxite-based refractory brick prepared in the embodiment is detected as follows: the breaking strength is 25-40 MPa; the breaking strength retention rate is 37 percent after water cooling at 1100 ℃ for five times; the corrosion index of a slag resistance experiment of a 1600 ℃ static crucible method is 10 percent, and the permeability index is 29 percent; the service life of the steel ladle applied to 200t refining is 211 times.
Example 6
A light-weight alumina-based refractory brick and a preparation method thereof. 65 wt% of light-weight alumina clinker particles are used as aggregate, 5 wt% of fused magnesia fine powder, 12 wt% of light-weight alumina clinker fine powder, 8 wt% of spinel fine powder and 10 wt% of alpha-Al2O3The micro powder is used as a base material; firstly, uniformly mixing the matrix material, then adding the uniformly mixed matrix material into the aggregate, and uniformly mixing; then adding a binding agent accounting for 6 wt% of the sum of the aggregate and the matrix material, mixing and grinding, pressing and forming, drying for 20 hours at the temperature of 200 ℃, and preserving heat for 1 hour at the temperature of 1600 ℃ to prepare the lightweight bauxite-based refractory brick.
The preparation method of the light-weight alumina clinker particles and the light-weight alumina clinker fine powder comprises the following steps: putting 97 wt% of alumina raw material micro powder, 2.9 wt% of carbon black and 0.1 wt% of plant ash into a planetary ball mill, uniformly mixing, performing mechanical compression molding under the condition of 100MPa, drying for 36 hours at the temperature of 110 ℃, and then preserving heat for 3 hours at the temperature of 1750 ℃ and under the condition of carbon embedding to obtain the lightweight alumina clinker. And finally crushing and screening the light-weight alumina clinker to obtain light-weight alumina clinker particles and light-weight alumina clinker fine powder.
The binding agent is aluminum dihydrogen phosphate.
The lightweight bauxite-based refractory brick prepared in the embodiment is detected as follows: the breaking strength is 25-40 MPa; the breaking strength retention rate is 36 percent after water cooling at 1100 ℃ for five times; the corrosion index of a slag resistance experiment of a 1600 ℃ static crucible method is 7 percent, and the permeability index is 25 percent; the service life of the steel ladle applied to 200t refining is 219 times.
Compared with the prior art, the specific implementation mode has the following positive effects:
(1) in the preparation process of the lightweight alumina clinker introduced in the embodiment, the potassium oxide formed by the decomposition of the plant ash through heat treatment can rapidly form a liquid phase with silicon dioxide and other impurities in the alumina at high temperature, and small-particle iron and silicon can be precipitated in a carbon-buried reducing atmosphere. Under the catalytic action of the small-particle iron, the small-particle silicon reacts with the carbon black to generate the silicon carbide crystal whisker in situ; in addition, the existence of the silicon carbide whiskers in the lightweight alumina clinker particles and the fine powder introduced in the embodiment can improve the mechanical strength and the thermal shock resistance of the lightweight alumina-based refractory brick.
(2) The fused magnesia fine powder and the alpha-Al are introduced into the base material of the embodiment2O3The micro powder can react in situ to form spinel, and forms a multi-stage spinel structure with the spinel micro powder in the matrix material, so that Fe and Mn elements can be captured during the reaction with the slag, and the viscosity of the slag is increased; meanwhile, the silicon carbide whiskers in the light-weight alumina clinker particles and the fine powder introduced by the embodiment can also delay the erosion and the penetration of the slag on the material; therefore, the slag erosion resistance of the lightweight alumina-based refractory brick can be improved.
(3) The lightweight bauxite-based refractory brick prepared by the specific embodiment has high mechanical strength, excellent thermal shock resistance and strong slag erosion resistance, so that the service life of the high-temperature industrial furnace working layer in service can be obviously prolonged.
The lightweight bauxite-based refractory brick prepared by the embodiment is detected as follows: the breaking strength is 25-40 MPa; the breaking strength retention rate after water cooling at 1100 ℃ for five times is 28-38%; the corrosion index of a slag resistance experiment of a 1600 ℃ static crucible method is 6-17%, and the permeability index is 25-50%; the service life of the steel ladle is 170-220 times when the steel ladle is applied to 200t refining.
Therefore, the lightweight bauxite-based refractory brick prepared by the embodiment has the characteristics of high strength, good thermal shock resistance, strong slag erosion resistance and long service life.
Claims (9)
1. A preparation method of a lightweight bauxite-based refractory brick is characterized by comprising the following steps: taking 50-65 wt% of light-weight alumina clinker particles as aggregate, 4-10 wt% of fused magnesia fine powder, 12-18 wt% of light-weight alumina clinker fine powder, 8-14 wt% of magnesia-alumina spinel fine powder and 6-12 wt% of alpha-Al2O3The micro powder is used as a base material; firstly, uniformly mixing the matrix material, then adding the uniformly mixed matrix material into the aggregate, and uniformly mixing; then adding a binding agent accounting for 2-6 wt% of the sum of the aggregate and the matrix material, mixing and grinding, pressing and forming, drying for 20-36 hours at the temperature of 110-200 ℃, and preserving heat for 1-8 hours at the temperature of 1400-1600 ℃ to prepare the lightweight bauxite-based refractory brick;
the preparation method of the light-weight alumina clinker particles and the light-weight alumina clinker fine powder comprises the following steps: putting 89-97 wt% of bauxite raw material micro powder, 1-9 wt% of carbon black and 0.1-4 wt% of plant ash into a planetary ball mill, uniformly mixing, performing mechanical compression molding under the condition of 100-200 MPa, drying for 12-36 hours at the temperature of 110-200 ℃, and then preserving heat for 3-8 hours at the temperature of 1550-1750 ℃ under the condition of carbon embedding to obtain light-weight bauxite clinker; finally crushing and screening the light-weight alumina clinker to obtain light-weight alumina clinker particles and light-weight alumina clinker fine powder;
the volume density of the light-weight alumina clinker is 2.7-3.2 g/cm3The average pore diameter is 100-500 nm;
the particle size of the light-weight alumina clinker particles is 0.088-8 mm, and the particle size of the light-weight alumina clinker fine powder is less than 0.088 mm.
2. A method of manufacturing a lightweight bauxite-based refractory brick in accordance with claim 1, characterized in that the MgO content of the fused magnesia fine powder is >97 wt%; the grain diameter of the fused magnesia fine powder is less than 74 mu m.
3. A method for producing a lightweight bauxite-based refractory brick in accordance with claim 1, wherein the fine magnesium aluminate spinel powder contains Al2O3Content (wt.)>72 wt%; particle size D of magnesia-alumina spinel micropowder50Less than 6 μm.
4. The method of manufacturing a lightweight bauxite-based refractory brick in accordance with claim 1, wherein the α -Al is2O3Micronized Al2O3Content (wt.)>99wt％；α-Al2O3Particle diameter D of the micropowder50Less than 3.5 μm.
5. The method of claim 1, wherein the binder is one of aluminum dihydrogen phosphate, phenolic resin, and bound clay.
6. The method of producing a lightweight bauxite-based refractory brick according to claim 1, wherein the alumina raw material fine powder contains Al2O3The content is more than or equal to 60 wt%; particle diameter D of alumina raw material micropowder501 to 10 μm.
7. The method for producing a lightweight bauxite-based refractory brick according to claim 1, wherein the carbon black has a C content of not less than 99 wt%; the grain diameter of the carbon black is less than or equal to 100 nm.
8. The method for producing a lightweight bauxite-based refractory brick according to claim 1, wherein the grain size of the plant ash is 10 μm or less.
9. A lightweight alumina-based refractory brick characterized by being produced by the method for producing a lightweight alumina-based refractory brick according to any one of claims 1 to 8.
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