CN107266052B - Alumina-titanium calcium aluminate-silicon carbide complex phase refractory material and preparation method thereof - Google Patents

Alumina-titanium calcium aluminate-silicon carbide complex phase refractory material and preparation method thereof Download PDF

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CN107266052B
CN107266052B CN201710557753.6A CN201710557753A CN107266052B CN 107266052 B CN107266052 B CN 107266052B CN 201710557753 A CN201710557753 A CN 201710557753A CN 107266052 B CN107266052 B CN 107266052B
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silicon carbide
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alumina
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赵惠忠
陈建威
张寒
余俊
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Wuhan University of Science and Engineering WUSE
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Abstract

The invention relates to alumina-calcium titanium aluminate-silicon carbideThe technical scheme includes that the composite refractory material comprises 40-45 wt% of special-grade alumina particles, 20-30 wt% of special-grade alumina fine powder, 10-20 wt% of calcium titanium aluminate particles, 4-9 wt% of silicon carbide fine powder, 1-2 wt% of simple substance silicon and 2-5 wt% of active α -Al2O3Fine powder, 2-6 wt% Guangxi white mud fine powder and 0.5-1.5 wt% Y2O3And taking the fine powder as a raw material, adding a binding agent accounting for 3-4 wt% of the raw material, and mixing and rolling to obtain a mixture. Ageing the mixture, performing mechanical pressing, demolding, standing, drying, preserving the heat for 180-240 minutes in a muffle furnace under the air atmosphere and at the temperature of 1400-1530 ℃, and cooling along with the furnace to obtain the bauxite-calcium titanium aluminate-silicon carbide complex phase refractory material. The invention has low cost, simple process and high yield; the prepared product has large volume density, high breaking and compression strength, small heat conductivity coefficient and excellent thermal shock stability.

Description

Alumina-titanium calcium aluminate-silicon carbide complex phase refractory material and preparation method thereof
Technical Field
The present invention belongs to the field of alumina-silicon carbide complex phase refractory material technology. In particular to a bauxite-calcium titanium aluminate-silicon carbide complex phase refractory material and a preparation method thereof.
Background
Along with the consumption of natural ore raw materials and the accumulation of a large amount of waste residues generated in various smelting industries, the preparation of the refractory material by replacing special-grade alumina with calcium titanium aluminate has great significance. At present, the transition zone of the rotary cement kiln mainly uses various products such as high bauxite combined silicon carbide, mullite combined silicon carbide, sialon combined silicon carbide and the like; for example, in the patent technology of 'a mullite silicon carbide complex phase refractory material and a preparation method thereof' (CN 201610637867.7), mullite, silicon carbide, alumina, andalusite and the like are used as raw materials to prepare the mullite silicon carbide complex phase refractory material, although the heat conductivity coefficient of the material is reduced, the energy-saving and heat-preservation of a cement rotary kiln are facilitated, more light mullite aggregates are introduced, the cost of the material is greatly improved, and the thermal shock resistance of the material is not excellent; in another example of the technology of the "phosphate-bonded low-alumina mullite brick and the preparation method thereof" (CN 201410444238.3), the preparation cost is reduced by replacing the currently scarce special-grade or first-grade alumina with three-grade high-alumina, but the prepared phosphate-bonded low-alumina mullite brick has too high apparent porosity and low strength.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of the alumina-titanium calcium aluminate-silicon carbide complex phase refractory material with simple process, low cost and high yield.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following specific steps:
the first step is to use 40-45 wt% of special grade alumina particles, 20-30 wt% of special grade alumina fine powder, 10-20 wt% of calcium titanium aluminate particles, 4-9 wt% of silicon carbide fine powder, 1-2 wt% of simple substance silicon, and 2-5 wt% of active α -Al2O3Fine powder, 2-6 wt% Guangxi white mud fine powder and 0.5-1.5 wt% Y2O3And taking the fine powder as a raw material, adding a binding agent accounting for 3-4 wt% of the raw material, and mixing and rolling for 8-10 min to obtain a mixture.
Secondly, ageing the mixture for 4-5 hours at room temperature, performing mechanical pressing under the condition of 160-180 MPa, demolding, standing for 12-20 hours at room temperature, and drying for 24-30 hours at the temperature of 90-110 ℃; and then placing the mixture into a muffle furnace, preserving the heat for 180-240 minutes under the conditions of air atmosphere and 1400-1530 ℃, and cooling the mixture along with the furnace to obtain the alumina-titanium calcium aluminate-silicon carbide complex phase refractory material.
The main chemical components of the special-grade alumina are as follows: al (Al)2O3The content is more than or equal to 85.5wt percent, and SiO is2The content is more than or equal to 8.61wt%, TiO2Content is more than or equal to 3.33wt%, Fe2O3The content is more than or equal to 1.25wt percent, and the CaO content is less than or equal to 0.27wt percent;
the density of the special-grade alumina particles is 3.46g/cm3The apparent porosity is 14.5 percent, and the granularity is less than or equal to 3 mm; the granularity of the special-grade alumina fine powder is less than or equal to 0.088 mm.
The main chemical components of the calcium titanium aluminate particles are as follows: al (Al)2O3The content is more than or equal to 74.18 weight percent, the CaO content is more than or equal to 11.69 weight percent, and TiO2The content is more than or equal to 11.08wt percent, and Fe2O3The content is more than or equal to 1.03wt percent, the MgO is less than or equal to 1.51wt percent, and the SiO2 content is less than or equal to 0.42wt percent; the density of the calcium titanoaluminate particles was 3.28g/cm3The granularity is less than or equal to 3 mm.
The SiC content of the silicon carbide is more than or equal to 98.78 wt%;
the granularity of the silicon carbide particles is less than or equal to 3 mm; the granularity of the silicon carbide fine powder is less than or equal to 0.088 mm.
The Si content of the simple substance silicon is more than or equal to 95.9 wt%; the granularity of the silicon powder is less than or equal to 0.088 mm.
The activity α -Al2O3The granularity of the fine powder is less than or equal to 0.088mm, α -Al2O3Fine powder of Al2O3The content is more than or equal to 99.6wt percent.
The Guangxi white mud fine powder mainly comprises the following chemical components: SiO22The content is more than or equal to 49.25wt%, and Al2O3Content not less than 33.03wt%, Fe2O3The content is less than or equal to 1.24 wt%; the granularity of the Guangxi white mud fine powder is less than or equal to 0.088 mm.
Said Y is2O3The main chemical components of the fine powder are as follows: y is2O3The content is more than or equal to 99.8 wt%; y is2O3The granularity is less than or equal to 0.075 mm.
The binding agent is one of sulfite pulp waste liquid and aluminum dihydrogen phosphate solution; the concentration of the aluminum dihydrogen phosphate solution is more than or equal to 50 wt%.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the raw material of the calcium titanium aluminate selected by the invention has rich sources and low cost, and the process flow for preparing the raw material is simple, and special treatment technology and equipment are not needed, so the process for preparing the bauxite-calcium titanium aluminate-silicon carbide complex phase refractory material is simple and low in cost.
2. The invention utilizes the excellent characteristics of the calcium titanium aluminate raw material, such as high refractoriness and good wear resistance (abrasion loss A = 1.46)<The abrasion loss of alumina), low thermal conductivity coefficient, lower thermal expansion coefficient and excellent thermal shock resistance, and the thermal conductivity coefficient and the thermal expansion coefficient of the alumina-titanium calcium aluminate-silicon carbide complex phase refractory material are reduced; and the main phase of the titanium calcium aluminate raw material is CA6The flaky crystal form is beneficial to improving the strength, and the strength of the bauxite-calcium titanium aluminate-silicon carbide complex phase refractory material is improved.
The alumina-titanium calcium aluminate-silicon carbide complex phase refractory material prepared by the invention is detected as follows: the yield is 99.0-99.5%; the bulk density is 2.76 to 2.86 g-cm-3(ii) a The apparent porosity is 14-18%; the breaking strength is 18-26 MPa; the compressive strength is 80-135 MPa; the thermal conductivity coefficient is 1.8-2.4 W.m-1·K-1(1000 ℃ C.); coefficient of thermal expansion of 4.95X 10-6~5.5×10-6℃-1(1400 ℃ C.); the retention rate of the strength after thermal shock (Δ T =1100 ℃ C., air cooling for 3 times) is 78-83%.
Therefore, the invention has the characteristics of low cost, simple process and high yield; the prepared alumina-titanium calcium aluminate-silicon carbide complex phase refractory material has large volume density, large breaking and compression strength, small heat conductivity coefficient and excellent thermal shock stability.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
In order to avoid repetition, the raw materials related to this specific embodiment are uniformly described as follows, and are not described in detail in the embodiments:
the main chemical components of the special-grade alumina are as follows: al (Al)2O3The content is more than or equal to 85.5wt percent, and SiO is2The content is more than or equal to 8.61wt%, TiO2Content is more than or equal to 3.33wt%, Fe2O3The content is more than or equal to 1.25wt percent, and the CaO content is less than or equal to 0.27wt percent;
the density of the special-grade alumina particles is 3.46g/cm3The apparent porosity is 14.5 percent, and the granularity is less than or equal to 3 mm; the granularity of the special-grade alumina fine powder is less than or equal to 0.088 mm.
The main chemical components of the calcium titanium aluminate particles are as follows: al (Al)2O3The content is more than or equal to 74.18 weight percent, the CaO content is more than or equal to 11.69 weight percent, and TiO2The content is more than or equal to 11.08wt percent, and Fe2O3The content is more than or equal to 1.03wt percent, the MgO is less than or equal to 1.51wt percent, and the SiO2 content is less than or equal to 0.42wt percent; the density of the calcium titanoaluminate particles was 3.28g/cm3The granularity is less than or equal to 3 mm.
The SiC content of the silicon carbide is more than or equal to 98.78 wt%; the granularity of the silicon carbide particles is less than or equal to 3mm, and the granularity of the silicon carbide fine powder is less than or equal to 0.088 mm.
The Si content of the simple substance silicon is more than or equal to 95.9 wt%; the granularity of the silicon powder is less than or equal to 0.088 mm.
The activity α -Al2O3The granularity of the fine powder is less than or equal to 0.088mm, α -Al2O3Fine powder of Al2O3The content is more than or equal to 99.6wt percent.
The Guangxi white mud fine powder mainly comprises the following chemical components: SiO22The content is more than or equal to 49.25wt%, and Al2O3Content not less than 33.03wt%, Fe2O3The content is less than or equal to 1.24 wt%; the granularity of the Guangxi white mud fine powder is less than or equal to 0.088 mm.
Said Y is2O3The main chemical components of the fine powder are as follows: y is2O3The content is more than or equal to 99.8 wt%; y is2O3The granularity is less than or equal to 0.075 mm.
Example 1
An alumina-titanium calcium aluminate-silicon carbide complex phase refractory material and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
the first step is to use 40-42 wt% of special grade alumina particles, 20-24 wt% of special grade alumina fine powder, 16-20 wt% of calcium titanium aluminate particles, 4-6 wt% of silicon carbide particles, 7-9 wt% of silicon carbide fine powder, 1-2 wt% of simple substance silicon, and 3.5-5 wt% of active α -Al2O3Fine powder, 3.5-6 wt% Guangxi white mud fine powder and 0.5-1.5 wt% Y2O3And taking the fine powder as a raw material, adding a binding agent accounting for 3-4 wt% of the raw material, and mixing and rolling for 8-10 min to obtain a mixture.
Secondly, ageing the mixture for 4-5 hours at room temperature, performing mechanical pressing under the condition of 160-180 MPa, demolding, standing for 12-20 hours at room temperature, and drying for 24-30 hours at the temperature of 90-110 ℃; and then placing the mixture into a muffle furnace, preserving the heat for 180-240 minutes under the conditions of air atmosphere and 1400-1450 ℃, and cooling the mixture along with the furnace to obtain the alumina-titanium calcium aluminate-silicon carbide complex phase refractory material.
The binding agent is sulfite pulp waste liquid.
The alumina-titanium calcium aluminate-silicon carbide complex phase refractory material prepared by the invention is detected as follows: the yield is 99.0-99.5%; the bulk density is 2.81-2.84 g-cm-3(ii) a The apparent porosity is 14.5-16%; flexural strength of 21 DEG to24 MPa; the compressive strength is 110-125 MPa; the thermal conductivity coefficient is 2.2-2.4 W.m-1·K-1(1000 ℃ C.); coefficient of thermal expansion of 4.95X 10-6~5.15×10-6℃-1(1400 ℃ C.); the retention rate of the strength after thermal shock (Δ T =1100 ℃ C., air cooling for 3 times) is 81-83%.
Example 2
An alumina-titanium calcium aluminate-silicon carbide complex phase refractory material and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
in the first step, 41-43 wt% of special grade alumina particles, 22-26 wt% of special grade alumina fine powder, 14-18 wt% of calcium titanium aluminate particles, 5-7 wt% of silicon carbide particles, 6-8 wt% of silicon carbide fine powder, 1-2 wt% of simple substance silicon, and 3-4.5 wt% of active α -Al2O3Fine powder, 3-5.5 wt% Guangxi white mud fine powder and 0.5-1.5 wt% Y2O3And taking the fine powder as a raw material, adding a binding agent accounting for 3-4 wt% of the raw material, and mixing and rolling for 8-10 min to obtain a mixture.
Secondly, ageing the mixture for 4-5 hours at room temperature, performing mechanical pressing under the condition of 160-180 MPa, demolding, standing for 12-20 hours at room temperature, and drying for 24-30 hours at the temperature of 90-110 ℃; and then placing the mixture in a muffle furnace, preserving the heat for 180-240 minutes under the conditions of air atmosphere and 1430-1480 ℃, and cooling the mixture along with the furnace to obtain the bauxite-titanium calcium aluminate-silicon carbide complex phase refractory material.
The binding agent is aluminum dihydrogen phosphate solution; the concentration of the aluminum dihydrogen phosphate solution is more than or equal to 50 wt%.
The alumina-titanium calcium aluminate-silicon carbide complex phase refractory material prepared by the invention is detected as follows: the yield is 99.0-99.5%; the bulk density is 2.82-2.86 g-cm-3(ii) a The apparent porosity is 14-15%; the breaking strength is 23-26 MPa; the compressive strength is 120-135 MPa; the thermal conductivity coefficient is 2.1-2.3 W.m-1·K-1(1000 ℃ C.); coefficient of thermal expansion of 5.05X 10-6~5.25×10-6℃-1(1400 ℃ C.); the retention rate of the strength after thermal shock (Δ T =1100 ℃ C., air cooling for 3 times) is 80-82%.
Example 3
An alumina-titanium calcium aluminate-silicon carbide complex phase refractory material and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
in the first step, 42-44 wt% of special grade alumina particles, 24-28 wt% of special grade alumina fine powder, 12-16 wt% of calcium titanium aluminate particles, 6-8 wt% of silicon carbide particles, 5-7 wt% of silicon carbide fine powder, 1-2 wt% of simple substance silicon, 2.5-4 wt% of active α -Al2O3Fine powder, 2.5-5 wt% Guangxi white mud fine powder and 0.5-1.5 wt% Y2O3And taking the fine powder as a raw material, adding a binding agent accounting for 3-4 wt% of the raw material, and mixing and rolling for 8-10 min to obtain a mixture.
Secondly, ageing the mixture for 4-5 hours at room temperature, performing mechanical pressing under the condition of 160-180 MPa, demolding, standing for 12-20 hours at room temperature, and drying for 24-30 hours at the temperature of 90-110 ℃; and then placing the mixture into a muffle furnace, preserving the heat for 180-240 minutes under the conditions of air atmosphere and 1450-1500 ℃, and cooling the mixture along with the furnace to obtain the alumina-titanium calcium aluminate-silicon carbide complex phase refractory material.
The binding agent is sulfite pulp waste liquid.
The alumina-titanium calcium aluminate-silicon carbide complex phase refractory material prepared by the invention is detected as follows: the yield is 99.0-99.5%; the bulk density is 2.76 to 2.79 g-cm-3(ii) a The apparent porosity is 16-18%; the breaking strength is 18-21 MPa; the compressive strength is 80-95 MPa; the thermal conductivity coefficient is 1.8-2.0 W.m-1·K-1(1000 ℃ C.); coefficient of thermal expansion of 5.15X 10-6~5.35×10-6℃-1(1400 ℃ C.); the retention rate of the strength after thermal shock (Δ T =1100 ℃ C., air cooling for 3 times) is 79-81%.
Example 4
An alumina-titanium calcium aluminate-silicon carbide complex phase refractory material and a preparation method thereof. The preparation method of the embodiment comprises the following specific steps:
the first step is to use 43-45 wt% of special grade alumina particles, 26-30 wt% of special grade alumina fine powder, 10-14 wt% of calcium titanium aluminate particles, 7-9 wt% of silicon carbide particles, 4-6 wt% of silicon carbide fine powder, 1-2 wt% of simple substance silicon, and 2-3.5 wt% of active α -Al2O3Fine powder, 2-4.5 wt% Guangxi white mud fine powder and 0.5-1.5 wt% Y2O3Taking the fine powder as a raw material, and adding knots accounting for 3-4 wt% of the raw materialAnd mixing and rolling the mixture for 8-10 min to obtain a mixture.
Secondly, ageing the mixture for 4-5 hours at room temperature, performing mechanical pressing under the condition of 160-180 MPa, demolding, standing for 12-20 hours at room temperature, and drying for 24-30 hours at the temperature of 90-110 ℃; and then placing the mixture into a muffle furnace, preserving the heat for 180-240 minutes under the conditions of air atmosphere and 1480-1530 ℃, and cooling the mixture along with the furnace to obtain the alumina-titanium calcium aluminate-silicon carbide complex phase refractory material.
The binding agent is aluminum dihydrogen phosphate solution; the concentration of the aluminum dihydrogen phosphate solution is more than or equal to 50 wt%.
The alumina-titanium calcium aluminate-silicon carbide complex phase refractory material prepared by the invention is detected as follows: the yield is 99.0-99.5%; the bulk density is 2.78-2.82 g-cm-3(ii) a The apparent porosity is 15-17%; the breaking strength is 19-22 MPa; the compressive strength is 90-115 MPa; the thermal conductivity coefficient is 1.9-2.1 W.m-1·K-1(1000 ℃ C.); coefficient of thermal expansion of 5.25X 10-6~5.5×10-6℃-1(1400 ℃ C.); the retention rate of the strength after thermal shock (Δ T =1100 ℃ C., air cooling for 3 times) is 78-80%.
The binding agent is more than one of sulfite pulp waste liquid and aluminum dihydrogen phosphate solution; the concentration of the aluminum dihydrogen phosphate solution is more than or equal to 50 wt%.
Compared with the prior art, the invention has the following advantages:
1. the raw material of the calcium titanium aluminate selected by the invention has rich sources and low cost, and the process flow for preparing the raw material is simple, and special treatment technology and equipment are not needed, so the process for preparing the bauxite-calcium titanium aluminate-silicon carbide complex phase refractory material is simple and low in cost.
2. The invention utilizes the excellent characteristics of the calcium titanium aluminate raw material, such as high refractoriness and good wear resistance (abrasion loss A = 1.46)<The abrasion loss of alumina), low thermal conductivity coefficient, lower thermal expansion coefficient and excellent thermal shock resistance, and the thermal conductivity coefficient and the thermal expansion coefficient of the alumina-titanium calcium aluminate-silicon carbide complex phase refractory material are reduced; and the main phase of the titanium calcium aluminate raw material is CA6The flaky crystal form is beneficial to improving the strength, and the bauxite-calcium titanium aluminate-silicon carbide complex phase refractory material is improvedThe strength of the material.
The alumina-titanium calcium aluminate-silicon carbide complex phase refractory material prepared by the invention is detected as follows: the yield is 99.0-99.5%; the bulk density is 2.76 to 2.86 g-cm-3(ii) a The apparent porosity is 14-18%; the breaking strength is 18-26 MPa; the compressive strength is 80-135 MPa; the thermal conductivity coefficient is 1.8-2.4 W.m-1·K-1(1000 ℃ C.); coefficient of thermal expansion of 4.95X 10-6~5.5×10-6℃-1(1400 ℃ C.); the retention rate of the strength after thermal shock (Δ T =1100 ℃ C., air cooling for 3 times) is 78-83%.
Therefore, the invention has the characteristics of low cost, simple process and high yield; the prepared alumina-titanium calcium aluminate-silicon carbide complex phase refractory material has large volume density, large breaking and compression strength, small heat conductivity coefficient and excellent thermal shock stability.

Claims (9)

1. A preparation method of an alumina-titanium calcium aluminate-silicon carbide complex phase refractory material is characterized by comprising the following specific steps:
the first step is to use 40-45 wt% of special grade alumina particles, 20-30 wt% of special grade alumina fine powder, 10-20 wt% of calcium titanium aluminate particles, 4-9 wt% of silicon carbide fine powder, 1-2 wt% of simple substance silicon, and 2-5 wt% of active α -Al2O3Fine powder, 2-6 wt% Guangxi white mud fine powder and 0.5-1.5 wt% Y2O3Taking the fine powder as a raw material, adding a binding agent accounting for 3-4 wt% of the raw material, and mixing and rolling for 8-10 min to obtain a mixture;
secondly, ageing the mixture for 4-5 hours at room temperature, performing machine pressing forming under the condition of 160-180 MPa, demolding, standing for 12-20 hours at room temperature, drying for 24-30 hours at the temperature of 90-110 ℃, then placing in a muffle furnace, preserving heat for 180-240 minutes at the temperature of 1400-1530 ℃ in air atmosphere, and cooling along with the furnace to obtain the alumina-titanium calcium aluminate-silicon carbide complex phase refractory material;
the main chemical components of the special-grade alumina are as follows: al (Al)2O3The content is more than or equal to 85.5wt percent, and SiO is2The content is more than or equal to 8.61wt%, TiO2The content is more than or equal to 3.33wt percent,Fe2O3the content is more than or equal to 1.25wt percent, and the CaO content is less than or equal to 0.27wt percent; the granularity of the special alumina particles is less than or equal to 3mm, and the granularity of the special alumina fine powder is less than or equal to 0.088 mm;
the main chemical components of the calcium titanium aluminate particles are as follows: al (Al)2O3The content is more than or equal to 74.18 weight percent, the CaO content is more than or equal to 11.69 weight percent, and TiO2The content is more than or equal to 11.08wt percent, and Fe2O3The content is more than or equal to 1.03wt percent, the MgO is less than or equal to 1.51wt percent, and the SiO2 content is less than or equal to 0.42wt percent; the granularity of the calcium titanium aluminate particles is less than or equal to 3 mm;
the granularity of the silicon carbide particles is less than or equal to 3 mm; the granularity of the silicon carbide fine powder is less than or equal to 0.088 mm;
the granularity of the simple substance silicon is less than or equal to 0.088 mm.
The activity α -Al2O3The granularity of the fine powder is less than or equal to 0.088 mm;
the Guangxi white mud fine powder mainly comprises the following chemical components: SiO22The content is more than or equal to 49.25wt%, and Al2O3Content not less than 33.03wt%, Fe2O3The content is less than or equal to 1.24 wt%; the granularity of the Guangxi white mud fine powder is less than or equal to 0.088 mm;
said Y is2O3The granularity of the fine powder is less than or equal to 0.075 mm.
2. The method for preparing the bauxite-calcium titanium aluminate-silicon carbide composite refractory material as claimed in claim 1, wherein the density of the special-grade bauxite particles is 3.46g/cm3The apparent porosity was 14.5%.
3. The method for producing the alumina-calcium titanoaluminate-silicon carbide complex phase refractory according to claim 1, wherein the density of the calcium titanoaluminate particles is 3.28g/cm3。
4. The method for preparing the alumina-titanium calcium aluminate-silicon carbide complex phase refractory material according to claim 1, wherein the SiC content of the silicon carbide is more than or equal to 98.78 wt%.
5. The method for preparing the alumina-titanium calcium aluminate-silicon carbide complex phase refractory material according to claim 1, wherein the Si content of the simple substance silicon is more than or equal to 95.9 wt%.
6. The method for preparing the alumina-titanium calcium aluminate-silicon carbide complex phase refractory material as claimed in claim 1, wherein the α -Al is added2O3Fine powder of Al2O3The content is more than or equal to 99.6wt percent.
7. The method for preparing the alumina-titanium calcium aluminate-silicon carbide composite refractory according to claim 1, wherein Y is Y2O3The main chemical components of the fine powder are as follows: y is2O3The content is more than or equal to 99.8 wt%.
8. The method for preparing the alumina-titanium calcium aluminate-silicon carbide complex phase refractory material according to claim 1, wherein the binder is one of a sulfurous acid pulp waste solution and an aluminum dihydrogen phosphate solution; the concentration of the aluminum dihydrogen phosphate solution is more than or equal to 50 wt%.
9. The bauxite-calcium titanium aluminate-silicon carbide complex phase refractory material is characterized in that the bauxite-calcium titanium aluminate-silicon carbide complex phase refractory material is prepared by the preparation method of the bauxite-calcium titanium aluminate-silicon carbide complex phase refractory material according to any one of claims 1 to 8.
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