Pyrophyllite-containing anti-erosion Al2O3-SiC-C slag runner castable and preparation method thereof

Abstract

The invention discloses an anti-erosion Al2O3-SiC-C slag runner castable containing pyrophyllite and a preparation method of the anti-erosion Al2O3-SiC-C slag runner castable, and belongs to the technical field of refractory materials. The Al2O3-SiC-C slag trough castable is mainly prepared from the following raw materials in percentage by mass: 30 to 45 percent of high-alumina clinker, 20 to 35 percent of pyrophyllite, 8 to 15 percent of silicon carbide, 5 to 10 percent of kyanite, 5 to 10 percent of graphite electrode powder, 3 to 6 percent of active Al2O3 micro powder, 2 to 4 percent of silicon micro powder, 1.5 to 2.5 percent of antioxidant, 3 to 5 percent of pure calcium aluminate cement and 1.5 to 2.5 percent of asphalt. In addition, explosion-proof fibers accounting for 0.03-0.15% of the total weight of all the raw materials and a water reducing agent accounting for 0.05-0.15% of the total weight of all the raw materials are added. The anti-erosion Al2O3-SiC-C slag runner castable is prepared by mixing the weighed raw materials uniformly and then obtaining the anti-erosion Al2O3-SiC-C slag runner castable. The Al2O3-SiC-C slag runner castable prepared by the method can completely meet the requirements of the use performance of the Al2O3-SiC-C slag runner castable, and the Al2O3-SiC-C slag runner castable can be well applied to a blast furnace casting house; meanwhile, the cost is reduced, and remarkable social benefits and economic benefits are achieved.

Description

I. Technical Field:

[0001] The present invention belongs to the technical field of refractory materials, and particularly relates to an Al2O3 - SiC - C slag runner castable containing pyrophyllite for erosion resistance and a preparation method thereof. II. Background Art:

[0002] The use of Al2O3 - SiC - C tapping runner castables can significantly improve the service life of the tapping runner. With the widespread use of Al2O3 - SiC - C refractory materials in large blast furnaces, the consumption of Al2O3 - SiC - C series tapping runner castables has increased significantly, and at the same time, the consumption of raw materials has increased rapidly.

[0003] For the slag runner in the blast furnace tapping yard, due to its working environment and conditions, it is used intermittently in a cycle. Subject to the mechanical impact of high - temperature iron slag, the impact of high - temperature fluctuations, the erosion and scouring of high - temperature iron slag water, its service life is not satisfactory. Moreover, using some high - grade raw materials such as brown fused alumina, the cost is high, and enterprises are under great competitive pressure.

[0004] Currently, the slag runner materials for the tapping runner generally consist of dense fused alumina or brown fused alumina, some high - alumina clinker, silicon carbide, alumina micro - powder, silica fume, calcium aluminate cement, pitch coke and additives. The cost is high, and dense fused alumina or brown fused alumina is obtained by electric furnace smelting, with relatively poor toughness and weak thermal shock resistance, which easily causes cracking, spalling and chipping of the tapping runner material. At present, due to insufficient carbonaceous raw materials introduced in the slag runner materials for the tapping runner, the slag - iron water erosion resistance is poor, and it is easy to be penetrated, drilled and grooved by slag - iron water, with a short service life, requiring frequent hot repairs, increasing material consumption, enhancing the work intensity of construction workers, and causing environmental pollution at the smelting site. III. Summary of the Invention:

[0005] The technical problem to be solved by the present invention is: Aiming at the problems existing in the commonly used tapping runner castables in the prior art, such as poor erosion resistance, poor thermal shock resistance, poor spalling resistance, easy cracking leading to slag - iron water penetration, and even safety accidents, lack of erosion resistance to high - temperature slag - iron water, unsatisfactory service life, high production cost, and unsmooth production in the tapping yard. The present invention provides an Al2O3 - SiC - C slag runner castable containing pyrophyllite for erosion resistance and a preparation method thereof. In the raw material ratio of the Al2O3 - SiC - C slag runner castable of the present invention, pyrophyllite and kyanite raw materials are introduced, graphite electrode powder is added, and they are combined with raw materials such as high - alumina clinker and silicon carbide, and matching additives are used. The prepared Al2O3 - SiC - C slag runner castable can fully meet the requirements of its service performance and can be well applied to the blast furnace tapping yard; at the same time, the cost is reduced, and it has significant social and economic benefits.

[0006] To solve the above problems, the technical solution adopted by the present invention is:

[0007] The present invention provides a pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable. In terms of mass percentage, the Al2O3-SiC-C slag runner castable mainly consists of the following raw materials: 30-45% of high-alumina clinker, 20-35% of pyrophyllite, 8-15% of silicon carbide, 5-10% of cyanite, 5-10% of graphite electrode powder, 3-6% of active Al2O3 micropowder, 2-4% of silicon micropowder, 1.5-2.5% of antioxidant, 3-5% of calcium aluminate cement, and 1.5-2.5% of pitch. Additionally, 0.03-0.15% of explosion-proof fiber and 0.05-0.15% of water reducer are added based on the total weight of all the above raw materials.

[0008] For the above-mentioned pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable, the Al2O3 content in the high-alumina clinker is 87.5-88.5%, the TiO2 content is 1.5-3.2%, the Fe2O3 content ≤ 1.5%, and the bulk density > 3.25 g / cm 3 ;

[0009] In terms of mass percentage, the different particle size gradations of the high-alumina clinker are as follows: 30-40% of 8-5 mm high-alumina clinker, 30-40% of 5-3 mm high-alumina clinker, and 20-30% of 3-1 mm high-alumina clinker.

[0010] For the above-mentioned pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable, the SiO2 content in the pyrophyllite is 68-72%, the Al2O3 content is 18-22%, the Fe2O3 ≤ 1.5%, and the bulk density ≥ 2.80 g / cm 3 ;

[0011] In terms of mass percentage, the different particle size gradations of the pyrophyllite are as follows: 30-40% of 5-3 mm pyrophyllite, 30-40% of 3-1 mm pyrophyllite, and 30-40% of 1-0 mm pyrophyllite.

[0012] For the above-mentioned pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable, the SiC content in the silicon carbide is 97.5-98.5%, and the Fe2O3 content ≤ 0.5%;

[0013] In terms of mass percentage, the different particle size gradations of the silicon carbide are as follows: 40-50% of 1-0 mm silicon carbide and 50-60% of -200 mesh silicon carbide.

[0014] According to the above-mentioned pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag trench castable, the content of Al2O3 in the kyanite is 59-61%, Fe2O3≤1.2%, and the particle size of the kyanite is finer than -150 mesh; the particle size of the graphite electrode powder is finer than -180 mesh, the carbon content in the graphite electrode powder is ≥98%, and the ash content is ≤1.5%; the particle size of the active Al2O3 micropowder is finer than 2 microns, and the content of Al2O3 in the active Al2O3 micropowder is 99-99.5%; the particle size of the silica fume is finer than -325 mesh, and the content of SiO2 in the silica fume is 95-96%, Fe2O3 content ≤0.5%.

[0015] According to the above-mentioned pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag trench castable, the antioxidant is metallic silicon powder, the content of metallic silicon in the metallic silicon powder is ≥98%, and its particle size is finer than -200 mesh.

[0016] According to the above-mentioned pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag trench castable, the content of Al2O3 in the pure calcium aluminate cement is 78-82%, and the content of CaO is 18-22%.

[0017] According to the above-mentioned pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag trench castable, the asphalt is spherical asphalt, the particle size of the spherical asphalt is 1.0-0.15mm, the softening point is 110-130°C, and the fixed carbon content in the spherical asphalt is 45-55%, ash content ≤1.0%.

[0018] According to the above-mentioned pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag trench castable, the water reducer is sodium tripolyphosphate.

[0019] In addition, a preparation method of a pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag trench castable is provided, and the preparation method includes the following steps:

[0020] a. Weigh various raw materials according to the mixing ratio of the above-mentioned Al2O3-SiC-C slag trench castable;

[0021] b. Mix the weighed raw materials of high-aluminum clinker, pyrophyllite, silicon carbide, kyanite, graphite electrode powder, active Al2O3 micropowder, silica fume, antioxidant metallic silicon powder, pure calcium aluminate cement, asphalt, explosion-proof fiber and water reducer, and obtain the erosion-resistant Al2O3-SiC-C slag trench castable product after mixing evenly.

[0022] In the technical solution of the present invention, the pyrophyllite used has good insulation, good plasticity, adhesiveness and adsorbability. During the heating process, its structural water will gradually escape, resulting in volume change, and its refractoriness is generally about 1600 °C; pyrophyllite is rich in resources and is a relatively inexpensive refractory raw material. The kyanite used is an aluminosilicate mineral, and its micro-expansion property generated at high temperature is mainly utilized to match pyrophyllite and high-alumina clinker, having excellent thermal shock resistance and spalling resistance. The graphite electrode powder used has a high carbon content, is easier to be wetted by water than flake graphite, has good dispersibility, and has excellent erosion resistance to slag and hot metal. The technical solution of the present invention utilizes the excellent properties of pyrophyllite, kyanite and graphite electrode powder, and matches other raw materials to prepare a slag runner castable with excellent erosion resistance and spalling resistance.

[0023] In the technical solution of the present invention, part of pyrophyllite, kyanite raw materials and graphite electrode powder are introduced, metal silicon powder is used as an antioxidant, and under the interaction of additives such as high-alumina clinker, silicon carbide and explosion-proof agent, an erosion-resistant Al2O3-SiC-C slag runner castable with performance fully meeting the use requirements is prepared. The Al2O3-SiC-C slag runner castable is in a key position in the blast furnace tapping yard and has a great influence on the normal and smooth production of the blast furnace. Therefore, its performance requirements are harsh. The present invention uses pyrophyllite, kyanite raw materials and graphite electrode powder to meet the requirements of its use performance, extend the service life, greatly reduce the production cost, and has good application prospects.

[0024] The positive and beneficial effects of the present invention:

[0025] 1. In the preparation process of the present invention, part of pyrophyllite, kyanite and graphite electrode powder are introduced, matched with high-alumina clinker and silicon carbide, and an appropriate amount of antioxidant, water reducer and explosion-proof fiber are added, thereby improving the thermal shock resistance of the Al2O3-SiC-C slag runner castable, and improving the spalling resistance, erosion resistance, erosion resistance and abrasion resistance; at the same time, the service life of the trough material is extended, and the service life is extended by more than 30%.

[0026] 2. The erosion-resistant Al2O3-SiC-C slag runner castable prepared by the present invention has good construction performance, good fluidity, short setting time, can be quickly cast, quickly demolded and quickly baked during on-site casting construction in the blast furnace, and can fully meet the harsh conditions of rapid construction of small and medium-sized blast furnaces.

[0027] 3. The present invention uses pyrophyllite and kyanite in combination, replacing the commonly used dense corundum or brown corundum, improving the toughness of the trough material and reducing the structural volume change caused by high-temperature temperature fluctuations. Therefore, the thermal shock resistance of the taphole and slag trough material is improved, and cracking, spalling and chipping due to temperature fluctuations during blast furnace shutdown for maintenance are avoided, thereby increasing the service life.

[0028] 4. The present invention adds graphite electrode powder, that is, adds carbonaceous raw materials, enhancing the wettability of the taphole and slag trough material against slag and molten iron, that is, enhancing the slag and molten iron penetration resistance and erosion resistance of the material, extending the service life, reducing material consumption, and reducing the labor intensity of construction workers.

[0029] 5. The present invention significantly reduces the material cost. The price of brown corundum is about 5,500 yuan per ton, pyrophyllite is about 600 yuan per ton, and graphite electrode powder is about 5,000 yuan per ton. The cost of the taphole and slag trough material prepared by the present invention has decreased by 20 - 25%, and the number of thermal repairs in one service cycle is 1 - 2 times less than that of the existing slag trough material, reducing the consumption of thermal repair materials by 30 - 40%. Therefore, it has significant economic and social benefits. IV. Specific Embodiments:

[0030] The present invention will be further described below in conjunction with embodiments, but does not limit the scope of protection of the technical solution of the present invention.

[0031] In the following embodiments, the high-alumina clinker used has an Al2O3 content of 87.5 - 88.5%, a TiO2 content of 1.5 - 3.2%, an Fe2O3 content ≤ 1.5%, and a bulk density > 3.25 g / cm 3 ; the pyrophyllite has an SiO2 content of 68 - 72%, an Al2O3 content of 18 - 22%, Fe2O3 ≤ 1.5%, and a bulk density ≥ 2.80 g / cm 3; The SiC content in silicon carbide is 97.5 - 98.5%, and the Fe₂O₃ content is ≤0.5%; the Al₂O₃ content in cyanite is 59 - 61%, and Fe₂O₃ ≤1.2%. The particle size of the cyanite is -150 mesh and finer; the particle size of the graphite electrode powder is -180 mesh and finer. The carbon content in the graphite electrode powder is ≥98%, and the ash content is ≤1.5%; the particle size of the active Al₂O₃ micropowder is 2 microns and finer, and the Al₂O₃ content in the active Al₂O₃ micropowder is 99 - 99.5%; the particle size of the silica fume is -325 mesh and finer, and the SiO₂ content in the silica fume is 95 - 96%, and the Fe₂O₃ content is ≤0.5%; the antioxidant is metallic silicon powder, and the metallic silicon content in the metallic silicon powder is ≥98%, and its particle size is -200 mesh and finer; the Al₂O₃ content in the pure calcium aluminate cement is 78 - 82%, and the CaO content is 18 - 22%; the pitch is spherical pitch, the particle size of the spherical pitch is 1.0 - 0.15 mm, the softening point is 110 - 130 °C, the fixed carbon content in the spherical pitch is 45 - 55%, and the ash content is ≤1.0%.

[0032] Example 1:

[0033] The Al₂O₃ - SiC - C slag runner castable containing pyrophyllite and resistant to erosion of the present invention is composed of, in terms of mass percentage, 30% of high - alumina clinker, 30% of pyrophyllite, 10% of silicon carbide, 10% of cyanite, 5% of graphite electrode powder, 5% of active Al₂O₃ micropowder, 3% of silica fume, 2% of antioxidant metallic silicon powder, 3% of pure calcium aluminate cement, and 2% of pitch; in addition, 0.12% of explosion - proof fiber and 0.08% of water - reducing agent sodium tripolyphosphate are added based on the total weight of all the above raw materials.

[0034] In terms of mass percentage, the different particle - size gradations of the high - alumina clinker are: 40% of 8 - 5 mm high - alumina clinker, 30% of 5 - 3 mm high - alumina clinker, and 30% of 3 - 1 mm high - alumina clinker.

[0035] In terms of mass percentage, the different particle - size gradations of the pyrophyllite are: 30% of 5 - 3 mm pyrophyllite, 40% of 3 - 1 mm pyrophyllite, and 30% of 1 - 0 mm pyrophyllite.

[0036] In terms of mass percentage, the different particle - size gradations of the silicon carbide are: 50% of 1 - 0 mm silicon carbide and 50% of - 200 mesh silicon carbide.

[0037] Example 2:

[0038] The pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable of the present invention is composed of, by mass percentage, 40% of high-alumina clinker, 25% of pyrophyllite, 10% of silicon carbide, 5% of cyanite, 5% of graphite electrode powder, 5% of active Al2O3 micropowder, 3% of silicon micropowder, 2% of antioxidant metal silicon powder, 3% of calcium aluminate cement, and 2% of pitch; in addition, 0.12% of explosion-proof fiber and 0.10% of water reducer sodium tripolyphosphate are added based on the total weight of all the above raw materials.

[0039] By mass percentage, the different particle size gradations of the high-alumina clinker are: 35% of 8-5mm high-alumina clinker, 40% of 5-3mm high-alumina clinker, and 25% of 3-1mm high-alumina clinker.

[0040] By mass percentage, the different particle size gradations of the pyrophyllite are: 40% of 5-3mm pyrophyllite, 30% of 3-1mm pyrophyllite, and 30% of 1-0mm pyrophyllite.

[0041] By mass percentage, the different particle size gradations of the silicon carbide are: 40% of 1-0mm silicon carbide and 60% of -200 mesh silicon carbide.

[0042] Example 3:

[0043] The pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable of the present invention is composed of, by mass percentage, 35% of high-alumina clinker, 30% of pyrophyllite, 10% of silicon carbide, 5% of cyanite, 5% of graphite electrode powder, 5% of active Al2O3 micropowder, 3% of silicon micropowder, 2% of antioxidant metal silicon powder, 3% of calcium aluminate cement, and 2% of pitch; in addition, 0.12% of explosion-proof fiber and 0.15% of water reducer sodium tripolyphosphate are added based on the total weight of all the above raw materials.

[0044] By mass percentage, the different particle size gradations of the high-alumina clinker are: 40% of 8-5mm high-alumina clinker, 40% of 5-3mm high-alumina clinker, and 20% of 3-1mm high-alumina clinker.

[0045] By mass percentage, the different particle size gradations of the pyrophyllite are: 30% of 5-3mm pyrophyllite, 30% of 3-1mm pyrophyllite, and 40% of 1-0mm pyrophyllite.

[0046] By mass percentage, the different particle size gradations of the silicon carbide are: 50% of 1-0mm silicon carbide and 50% of -200 mesh silicon carbide.

[0047] Example 4:

[0048] The pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable of the present invention is composed of, in terms of mass percentage, 40% of high-alumina clinker, 20% of pyrophyllite, 10% of silicon carbide, 5% of cyanite, 10% of graphite electrode powder, 5% of activated Al2O3 micropowder, 3% of silicon micropowder, 2% of antioxidant metallic silicon powder, 3% of calcium aluminate cement, and 2% of asphalt; in addition, 0.10% of explosion-proof fiber and 0.08% of water reducer sodium tripolyphosphate are added based on the total weight of all the above raw materials.

[0049] In terms of mass percentage, the different particle size gradations of the high-alumina clinker are composed of: 40% of 8-5mm high-alumina clinker, 30% of 5-3mm high-alumina clinker, and 30% of 3-1mm high-alumina clinker.

[0050] In terms of mass percentage, the different particle size gradations of the pyrophyllite are composed of: 30% of 5-3mm pyrophyllite, 35% of 3-1mm pyrophyllite, and 35% of 1-0mm pyrophyllite.

[0051] In terms of mass percentage, the different particle size gradations of the silicon carbide are composed of: 50% of 1-0mm silicon carbide and 50% of -200 mesh silicon carbide.

[0052] Preparation method of the pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable described in Examples 1 to 4 of the present invention:

[0053] a. Weigh various raw materials according to the mixing ratio of the Al2O3-SiC-C slag runner castable described in any one of Examples 1 to 4.

[0054] b. Mix the weighed raw materials including high-alumina clinker, pyrophyllite, silicon carbide, cyanite, graphite electrode powder, activated Al2O3 micropowder, silicon micropowder, antioxidant metallic silicon powder, calcium aluminate cement, asphalt, explosion-proof fiber, and water reducer. After mixing evenly, the erosion-resistant Al2O3-SiC-C slag runner castable product is obtained.

[0055] Perform relevant performance tests on the products prepared in the above Examples 1 to 4. The test results are shown in Table 1.

[0056] Table 1 Relevant performance test results of the products prepared in Examples 1 to 4 of the present invention

[0057]

[0058] It can be seen from the test results in Table 1 that: in the present invention, by introducing partial pyrophyllite, kyanite and graphite electrode powder and cooperating with corresponding raw materials, the performance of the prepared product can fully meet that of the existing Al2O3-SiC-C slag runner castable products in the prior art, and even exceeds the performance of the existing products. The bulk density of the product has decreased, the thermal conductivity has been reduced, that is, the erosion resistance and the ability to resist temperature fluctuations have been enhanced. Thereby, the spalling resistance and thermal shock resistance have been improved, and the service life has been increased. Therefore, after introducing pyrophyllite, kyanite and graphite electrode powder, the prepared slag runner castable of the present invention fully meets the usage requirements of the blast furnace tapping yard, enhances its erosion resistance, spalling resistance and the ability to resist high-temperature fluctuation impact, increases the service life, reduces the consumption of energy and resources, lowers the production cost, has remarkable social and economic benefits, and has good application prospects.

Claims

1. An Al2O3-SiC-C slag runner castable resistant to erosion containing pyrophyllite, characterized in that: In terms of mass percentage, the Al2O3-SiC-C slag runner castable mainly consists of 30-45% of high alumina clinker, 20-35% of pyrophyllite, 8-15% of silicon carbide, 5-10% of kyanite, 5-10% of graphite electrode powder, 3-6% of active Al2O3 micropowder, 2-4% of silica fume, 1.5-2.5% of antioxidant, 3-5% of calcium aluminate cement and 1.5-2.5% of asphalt; in addition, 0.03-0.15% of explosion-proof fiber and 0.05-0.15% of water reducing agent are added based on the total weight of all the above raw materials.

2. The pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable according to claim 1, wherein: The content of Al2O3 in the high-alumina clinker is 87.5 - 88.5%, the content of TiO2 is 1.5 - 3.2%, the content of Fe2O3 ≤ 1.5%, and the bulk density > 3.25 g / cm 3 ; In terms of mass percentage, the different particle size gradations of the high alumina clinker are composed of: 30-40% of 8-5mm high alumina clinker, 30-40% of 5-3mm high alumina clinker and 20-30% of 3-1mm high alumina clinker.

3. The pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable according to claim 1, characterized in that: The pyrophyllite contains 68-72% of SiO2, 18-22% of Al2O3, Fe2O3≤1.5%, and the bulk density ≥2.80g / cm 3 ; In terms of mass percentage, the different particle size gradations of the pyrophyllite are composed of: 30-40% of 5-3mm pyrophyllite, 30-40% of 3-1mm pyrophyllite and 30-40% of 1-0mm pyrophyllite.

4. The pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable according to claim 1, wherein: The SiC content in the silicon carbide is 97.5-98.5%, and the Fe2O3 content is ≤0.5%. In terms of mass percentage, the different particle size gradations of the silicon carbide are composed of: 40-50% of 1-0mm silicon carbide and 50-60% of -200 mesh silicon carbide.

5. The pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable according to claim 1, characterized in that: The Al2O3 content in the kyanite is 59-61%, and Fe2O3 ≤1.2%. The particle size of the kyanite is finer than -150 mesh; the particle size of the graphite electrode powder is finer than -180 mesh, the carbon content in the graphite electrode powder is ≥98%, and the ash content is ≤1.5%; the particle size of the active Al2O3 micropowder is finer than 2 microns, and the Al2O3 content in the active Al2O3 micropowder is 99-99.5%; the particle size of the silica fume is finer than -325 mesh, the SiO2 content in the silica fume is 95-96%, and the Fe2O3 content is ≤0.5%.

6. The pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable according to claim 1, wherein: The antioxidant is metallic silicon powder, and the metallic silicon content in the metallic silicon powder is ≥98%, and its particle size is finer than -200 mesh.

7. The pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable according to claim 1, characterized in that: The Al2O3 content in the calcium aluminate cement is 78-82%, and the CaO content is 18-22%.

8. The pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable according to claim 1, wherein: The asphalt is spherical asphalt, the particle size of the spherical asphalt is 1.0-0.15mm, the softening point is 110-130°C, the fixed carbon content in the spherical asphalt is 45-55%, and the ash content is ≤1.0%.

9. The pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable according to claim 1, wherein: The water reducing agent is sodium tripolyphosphate.

10. A preparation method of a pyrophyllite-containing erosion-resistant Al2O3-SiC-C slag runner castable, characterized in that, The preparation method includes the following steps: a. Weigh various raw materials according to the mixing ratio of the Al2O3-SiC-C slag runner castable described in Claim 1. b. Mix the weighed raw materials of high alumina clinker, pyrophyllite, silicon carbide, kyanite, graphite electrode powder, active Al2O3 micropowder, silica fume, antioxidant metallic silicon powder, calcium aluminate cement, asphalt, explosion-proof fiber and water reducing agent, and after mixing evenly, obtain the erosion-resistant Al2O3-SiC-C slag runner castable product.

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