CN116589289A - Acid-resistant castable and preparation method thereof - Google Patents

Abstract

The invention discloses an acid-resistant pouring material and a preparation method thereof. In the present invention, recycled ceramics, corundum and coke gemstones are used as acid-resistant aggregates, silica micropowder and activated alumina powder are used as acid-resistant powders, silica sol is used as a binder, and aluminate cement, water and admixtures are added on this basis. The prepared acid-resistant castable has a dense structure and has the advantages of high strength, excellent wear resistance, good permeability resistance, high thermal stability, and good acid resistance. It can meet the use conditions of the equipment lining and effectively ensure the safe and stable operation of the equipment. , help to achieve good economic and social benefits.

Description

A kind of acid-resistant castable and preparation method thereof

technical field

The invention relates to an acid-resistant castable and a preparation method thereof, belonging to the field of refractory materials.

Background technique

Refractories can be divided into shaped refractories and unshaped refractories. Castables are the most widely used in unshaped refractories. The castable is mainly composed of refractory aggregate, powder, binder and admixture. It has high fluidity. It is generally constructed by pouring method and can be hardened without heating. However, the refractory castables used for the lining of various towers, furnaces, chimneys and other equipment in metallurgy, medicine, chemical industry, petroleum and other industries will be damaged after a period of use due to the effect of thermal stress and the erosion of acidic water vapor. .

The patent application publication No. CN115180964A discloses a high-strength acid-resistant lightweight castable. Silica micropowder, spodumene, industrial alumina fine powder, high alumina cement, first grade high alumina clinker powder, refractory fiber, admixture. The pouring material can resist acid corrosion but has poor permeability resistance, and it is easy to crack after being corroded by water vapor.

The patent application publication number is CN112573909A discloses a ceramic wear-resistant material based on nano-silica sol, and its components are: wear-resistant aggregate, calcium aluminate titanate, silicon carbide, activated alumina powder, zirconium silica fume, A70 Cement, silica sol, admixtures. The ceramic wear-resistant material has excellent wear resistance but poor acid resistance, and it will be damaged too quickly when it is eroded by acidic water vapor, which will affect the life of the equipment.

Contents of the invention

The present invention aims to solve the above problems, thereby providing an acid-resistant castable. In the present invention, recycled ceramics, corundum, and coke gemstones are used as acid-resistant aggregates, silicon micropowder and activated alumina powder are used as acid-resistant powders, silica sol is used as a binder, and Portland cement, water and additives are added on this basis. . During the preparation, various materials are configured into two formulas according to the particle size and their respective physical properties. One formula is mainly composed of large and medium particle size materials, and the other is mainly composed of medium and small particle size materials. The two kinds of castables used, and then the two castables are mixed to make the required acid-resistant castable; the structure of the acid-resistant castable is optimized, and the acid-resistant castable prepared by this method has a compact structure, high strength, excellent wear resistance, It has high thermal stability, good permeability resistance and good acid resistance, which can meet the use conditions of the equipment lining, thus effectively ensuring the safe and stable operation of the equipment.

The technical scheme that the present invention solves the above problems is as follows:

An acid-resistant castable, comprising the following components by weight: 45-75 parts of acid-resistant aggregate, 15-35 parts of acid-resistant powder, 5-10 parts of aluminate cement, 5-15 parts of binder, and 5-7 parts of water parts, admixture 3.02~6 parts;

The acid-resistant aggregate is selected from one or more of recovered ceramics, corundum, and burnt gems;

The acid-resistant powder is selected from one or more of silicon micropowder and activated alumina powder;

The binding agent is silica sol;

The admixture includes high temperature resistant fiber, dispersant and coagulant.

Preferably, the acid-resistant aggregate includes the following components:

Particle size 3~5mm 25~35 parts;

Particle size 1~3mm 10~20 parts;

Particle size 0.1~1mm 10~20 parts.

Preferably, the acid-resistant powder comprises the following components:

Silica powder 10~20 parts;

Activated alumina powder 5~15 parts.

Preferably, the admixture includes the following components:

3~5 parts of high temperature resistant fiber;

Dispersant 0.01~0.5 parts;

Coagulant 0.01~0.5 parts.

Preferably, the alumina content in the recycled ceramics is greater than 90%.

Preferably, the corundum is sintered corundum.

Preferably, the silicon micropowder is made of high-siliceous waste powder.

Preferably, the SiO ₂ solid content of the silica sol is ≥ 40%.

Preferably, the dispersant is at least one of sodium hexametaphosphate, sodium tripolyphosphate and sodium citrate.

Preferably, the coagulant is at least one of magnesium oxide and magnesium hydroxide.

Recycled ceramics, mainly composed of alumina and silicon oxide, can resist acid corrosion; they are products fired at high temperature, and have excellent high temperature resistance and wear resistance.

Corundum, the main component is alumina, can resist acid corrosion; high melting point, high temperature resistance; high hardness, anti-wear.

Jiaoge, with the characteristics of high temperature resistance, corrosion resistance and wear resistance, can improve the acid resistance and wear resistance of acid-resistant castables.

Microsilica powder can fill the gaps between materials; and because of firing, the phase can remain relatively stable.

Activated alumina powder can increase the wear resistance, high temperature resistance, acid resistance and other properties of the castable.

Aluminate cement can increase the acid resistance and wear resistance of castables.

Silica sol, when used as a castable binder, the three-dimensional network structure formed by the silica sol mainly through the condensation reaction between particles (-Si-OH + HO-Si- = -Si-O-Si- + H ₂ O) is The castable provides initial strength, and the nano-silica present in the silica sol can also react with the active components in the castable to improve the performance of the castable during heat treatment.

High temperature resistant fibers can still maintain general mechanical properties under high temperature for a long time, and can be used as reinforcing materials for castables to enhance their structural strength.

Dispersant, the function of the silica sol binder is to disperse around the sol particles, and adjust the flow of the castable by increasing the Zeta potential of the matrix in the castable, adjusting the distance between the colloidal particles, and improving the stability of the sol sex.

Coagulation accelerator can capture H ⁺ on the surface of silica sol particles, promote the condensation reaction of silanol groups between silica sol particles, accelerate the formation of siloxane network, increase the coagulation speed of castables, and increase the initial strength.

The preparation method of acid-resistant castable of the present invention comprises the following steps:

S1. Stir the recycled ceramics, corundum, coke gemstone, silica micropowder, activated alumina powder, aluminate cement, water, silica sol, high temperature resistant fiber, dispersant, and coagulant in the mixer evenly to obtain a mixed material 1; In this step, the amount of acid-resistant aggregate with a particle size of 0.1-5mm accounts for 75-90% of the total amount of acid-resistant aggregate, the amount of acid-resistant powder accounts for 15-25% of the total amount of acid-resistant powder, and the amount of aluminate cement accounts for 10% of the total amount of acid-resistant powder. 80~95% of the total amount of salt cement, the amount of silica sol accounts for 5~15% of the total amount of silica sol, the amount of high temperature resistant fiber accounts for 70~85% of the total amount of high temperature resistant fiber, and the amount of dispersant accounts for 5% of the total amount of dispersant 70~85%, the amount of coagulant accelerator accounts for 70~85% of the total amount of coagulant accelerator, and the amount of water accounts for 40~60% of the total amount of water;

S2. Stir corundum, coke gemstone, silica micropowder, activated alumina powder, aluminate cement, water, silica sol, high temperature resistant fiber, dispersant, and coagulant in a mixer evenly to obtain a mixture 2; In the step, the amount of acid-resistant aggregate, acid-resistant powder, aluminate cement, silica sol, high-temperature-resistant fiber, dispersant, coagulant, and water is the balance;

S3, further mixing the mixed material 1 and the mixed material 2 evenly to obtain a castable.

As an optimization of the above-mentioned technical solution, in step S1, the particle size of recovered ceramics is 3-5mm, and the usage amount accounts for more than 95% of the total amount of recycled ceramics; the particle size of corundum is 1-3mm, and the usage amount accounts for 75-85% of the total amount of corundum. %; the particle size of coke gemstones is 0.1~1mm, and the usage amount accounts for 45~55% of the total amount of coke gemstones; the usage amount of microsilica powder accounts for 15~25% of the total amount of microsilica powder; the usage amount of activated alumina powder accounts for 15~25% of the total amount.

The present invention has following beneficial effect:

1. The acid-resistant castable prepared by the present invention has a compact structure, high strength and excellent wear resistance, which can meet the conditions of use for equipment linings;

2. The acid-resistant castable prepared by the present invention has high thermal stability and can be bonded to equipment when the production temperature changes;

3. The acid-resistant castable prepared by the present invention has low water absorption and good permeability resistance, which can prevent the equipment lining from cracking and prolong the life of the equipment;

4. The acid-resistant castable prepared by the present invention has good acid resistance, can resist acid gas erosion, and can effectively ensure safe and stable operation of equipment.

Detailed ways

Example 1

An acid-resistant castable, the raw materials are weighed according to the weight ratio: 25 parts of 3~5mm recycled ceramics, 10 parts of 1~3mm sintered corundum, 10 parts of 0.1~1mm coke gem, 15 parts of activated alumina powder, 20 parts of silicon micropowder , 10 parts of aluminate cement, 10 parts of silica sol, 6 parts of water, 5 parts of high-temperature fiber, 0.06 part of sodium hexametaphosphate, and 0.02 part of magnesium oxide.

The preparation method of described acid-resistant castable comprises the following steps:

S1. Take 25 parts of 3~5mm recycled ceramics, 8 parts of 1~3mm sintered corundum, 5 parts of 0.1~1mm coke gem, 4 parts of silica powder, 3 parts of activated alumina powder, 9 parts of aluminate cement, 3 parts of water, 1 part of silica sol, 4 parts of high-temperature-resistant fiber, 0.05 part of sodium hexametaphosphate, and 0.015 part of magnesium oxide were stirred evenly in the mixer to obtain the mixed material 1;

S2. Take 2 parts of 1~3mm sintered corundum, 5 parts of 0.1~1mm coke gem, 16 parts of silicon micropowder, 12 parts of activated alumina powder, 1 part of aluminate cement, 3 parts of water, 9 parts of silica sol, 1 part of resistant High-temperature fiber, 0.01 part of sodium hexametaphosphate, and 0.005 part of magnesium oxide were stirred evenly in a mixer to obtain a mixture 2;

S3, further mixing the mixed material 1 and the mixed material 2 evenly to obtain a castable;

S4. Casting the pouring material as required.

Pour the castable into a mold of 160 mm × 40 mm × 40 mm. After vibration molding, it is cured at room temperature for 24 h, demolded and cured for another 24 h. The castable is dried in an electric furnace at 110°C × 24 h and After heat treatment at 1100 ℃ for 3 h, the physical performance test was carried out according to GB/T4513.6-2017; the acid resistance test was carried out according to GB/T 17601-2008.

The test results are: 110℃×24h drying: bulk density 1.12g/cm ³ , flexural strength 30.2Mpa, compressive strength 170.9Mpa, volume water absorption 4.2%; 1100℃×3h heat treatment: linear change -0.07%; Sulfuric acid attack: the mass loss ratio is 0.43%.

Example 2

An acid-resistant castable, the raw materials are weighed according to the weight ratio: 30 parts of 3~5mm recycled ceramics, 15 parts of 1~3mm sintered corundum, 15 parts of 0.1~1mm coke gem, 10 parts of activated alumina powder, 15 parts of silicon micropowder , 6 parts of aluminate cement, 9 parts of silica sol, 6 parts of water, 5 parts of high-temperature fiber, 0.06 part of sodium hexametaphosphate, and 0.02 part of magnesium oxide.

The preparation method of described acid-resistant castable comprises the following steps:

S1. Take 30 parts of 3~5mm recycled ceramics, 12 parts of 1~3mm sintered corundum, 7.5 parts of 0.1~1mm coke gem, 3 parts of silica powder, 2 parts of activated alumina powder, 5 parts of aluminate cement, 3 parts of water, 1 part of silica sol, 4 parts of high-temperature-resistant fiber, 0.05 part of sodium hexametaphosphate, and 0.015 part of magnesium oxide were stirred evenly in the mixer to obtain the mixed material 1;

S2. Take 3 parts of 1~3mm sintered corundum, 7.5 parts of 0.1~1mm coke gem, 12 parts of silicon micropowder, 8 parts of activated alumina powder, 1 part of aluminate cement, 3 parts of water, 8 parts of silica sol, 1 part of resistant High-temperature fiber, 0.01 part of sodium hexametaphosphate, and 0.005 part of magnesium oxide were stirred evenly in a mixer to obtain a mixture 2;

S3, further mixing the mixed material 1 and the mixed material 2 evenly to obtain a castable;

S4. Casting the pouring material as required.

Pour the castable into a mold of 160 mm × 40 mm × 40 mm. After vibration molding, it is cured at room temperature for 24 h, demolded and cured for another 24 h. The castable is dried in an electric furnace at 110°C × 24 h and After heat treatment at 1100 ℃ for 3 h, the physical performance test was carried out according to GB/T4513.6-2017; the acid resistance test was carried out according to GB/T 17601-2008.

The test results are: 110℃×24h drying: bulk density 0.95g/cm ³ , flexural strength 34.6Mpa, compressive strength 179.8Mpa, volume water absorption 3.3%; 1100℃×3h heat treatment: linear change -0.02%; Sulfuric acid attack: the mass loss ratio is 0.38%.

Example 3

An acid-resistant castable, the raw materials are weighed according to the weight ratio: 25 parts of 3~5mm recycled pottery, 20 parts of 1~3mm sintered corundum, 20 parts of 0.1~1mm coke gem, 5 parts of activated alumina powder, 10 parts of silicon micropowder , 10 parts of aluminate cement, 10 parts of silica sol, 6 parts of water, 5 parts of high-temperature fiber, 0.06 part of sodium hexametaphosphate, and 0.02 part of magnesium oxide.

The preparation method of described acid-resistant castable comprises the following steps:

S1. Take 25 parts of 3~5mm recycled ceramics, 16 parts of 1~3mm sintered corundum, 10 parts of 0.1~1mm coke gem, 2 parts of silica powder, 1 part of activated alumina powder, 9 parts of aluminate cement, 3 parts of water, 1 part of silica sol, 4 parts of high-temperature-resistant fiber, 0.05 part of sodium hexametaphosphate, and 0.015 part of magnesium oxide were stirred evenly in the mixer to obtain the mixed material 1;

S2. Take 4 parts of 1~3mm sintered corundum, 10 parts of 0.1~1mm coke gem, 8 parts of silicon micropowder, 4 parts of activated alumina powder, 1 part of aluminate cement, 3 parts of water, 9 parts of silica sol, 1 part of resistant High-temperature fiber, 0.01 part of sodium hexametaphosphate, and 0.005 part of magnesium oxide were stirred evenly in a mixer to obtain a mixture 2;

S3, further mixing the mixed material 1 and the mixed material 2 evenly to obtain a castable;

S4. Casting the pouring material as required.

Pour the castable into a mold of 160 mm × 40 mm × 40 mm. After vibration molding, it is cured at room temperature for 24 h, demolded and cured for another 24 h. The castable is dried in an electric furnace at 110°C × 24 h and After heat treatment at 1100 ℃ for 3 h, the physical performance test was carried out according to GB/T4513.6-2017; the acid resistance test was carried out according to GB/T 17601-2008.

The test results are: 110℃×24h drying: bulk density 1.09g/cm ³ , flexural strength 32.1Mpa, compressive strength 174.2Mpa, volume water absorption 3.8%; 1100℃×3h heat treatment: linear change -0.05%; Sulfuric acid attack: the mass loss ratio is 0.41%.

Comparative example 1

An acid-resistant castable, the raw materials are weighed according to the weight ratio: 30 parts of 3~5mm recycled ceramics, 15 parts of 1~3mm sintered corundum, 15 parts of 0.1~1mm coke gem, 10 parts of activated alumina powder, 15 parts of silicon micropowder , 6 parts of aluminate cement, 9 parts of silica sol, 6 parts of water, 5 parts of high-temperature fiber, 0.06 part of sodium hexametaphosphate, and 0.02 part of magnesium oxide.

The preparation method of described acid-resistant castable comprises the following steps:

S1. Take 30 parts of 3~5mm recycled ceramics, 15 parts of 1~3mm sintered corundum, 15 parts of 0.1~1mm coke gem, 5 parts of aluminate cement, 3 parts of water, 1 part of silica sol, 4 parts of high temperature resistant fiber, 0.05 1 part of sodium hexametaphosphate, 0.015 part of magnesium oxide, stirred uniformly in a mixer to obtain the mixed material 1;

S2, get 15 parts of silica powder, 10 parts of activated alumina powder, 1 part of aluminate cement, 3 parts of water, 8 parts of silica sol, 1 part of high temperature resistant fiber, 0.01 part of sodium hexametaphosphate, 0.005 part of magnesium oxide, in Stir evenly in the mixer to obtain the mixed material 2;

S3, further mixing the mixed material 1 and the mixed material 2 evenly to obtain a castable;

S4. Casting the pouring material as required.

Pour the castable into a mold of 160 mm × 40 mm × 40 mm. After vibration molding, it is cured at room temperature for 24 h, demolded and cured for another 24 h. The castable is dried in an electric furnace at 110°C × 24 h and After heat treatment at 1100 ℃ for 3 h, the physical performance test was carried out according to GB/T4513.6-2017; the acid resistance test was carried out according to GB/T 17601-2008.

The test results are: 110℃×24h drying: bulk density 1.23g/cm ³ , flexural strength 26.8Mpa, compressive strength 162.2Mpa, volume water absorption 4.5%; 1100℃×3h heat treatment: linear change -0.10%; Sulfuric acid attack: the mass loss ratio is 0.54%.

Comparative example 2

An acid-resistant castable, the raw materials are weighed according to the weight ratio: 30 parts of 3~5mm recycled ceramics, 15 parts of 1~3mm sintered corundum, 15 parts of 0.1~1mm coke gem, 10 parts of activated alumina powder, 15 parts of silicon micropowder , 6 parts of aluminate cement, 9 parts of silica sol, 6 parts of water, 5 parts of high-temperature fiber, 0.06 part of sodium hexametaphosphate, and 0.02 part of magnesium oxide.

The preparation method of described acid-resistant castable comprises the following steps:

S1. Take 30 parts of 3~5mm recycled ceramics, 15 parts of 1~3mm sintered corundum, 15 parts of 0.1~1mm burnt gemstones, 15 parts of silicon micropowder, 10 parts of activated alumina powder, 6 parts of aluminate cement, 5 parts of High-temperature fiber, 0.06 part of sodium hexametaphosphate, and 0.02 part of magnesium oxide were stirred evenly in the mixer to obtain the mixed material 1;

S2. Add the mixed material 2 consisting of 6 parts of water and 9 parts of silica sol to the mixed material 1, and mix evenly to obtain a castable;

S3. Casting the pouring material as required.

Pour the castable into a mold of 160 mm × 40 mm × 40 mm. After vibration molding, it is cured at room temperature for 24 h, demolded and cured for another 24 h. The castable is dried in an electric furnace at 110°C × 24 h and After heat treatment at 1100 ℃ for 3 h, the physical performance test was carried out according to GB/T4513.6-2017; the acid resistance test was carried out according to GB/T 17601-2008.

The test results are: 110℃×24h drying: bulk density 1.35g/cm ³ , flexural strength 23.4Mpa, compressive strength 154.5Mpa, volume water absorption 4.6%; 1100℃×3h heat treatment: linear change -0.14%; Sulfuric acid attack: the mass loss ratio is 0.68%.

Table 1: Partial component comparison table of embodiments 1~3 and comparative examples 1~2

Table 2: Performance comparison table of Examples 1~3 and Comparative Examples 1~2

It can be seen from Table 2 that after drying at 110°C×24h, the bulk density, flexural strength, and compressive strength of Examples 1-3 are all better than those of Comparative Examples 1-2, indicating that the strength of Examples 1-3 is , Abrasion resistance is better than Comparative Examples 1~2.

It can be seen from Table 2 that after drying at 110℃×24h, the volume water absorption rate of Examples 1~3 is lower than that of Comparative Examples 1~2 castables, indicating that Examples 1~3 have good permeability resistance and compactness In comparative example 1~2.

It can be seen from Table 2 that after heat treatment at 1100°C × 3h, the linear changes of Examples 1-3 are better than those of Comparative Examples 1-2, indicating that the thermal stability of Examples 1-3 is better than that of Comparative Examples 1-2.

As can be seen from Table 2, the acid resistance of Examples 1-3 is better than that of Comparative Examples 1-2.

It can be seen from Table 2 that the strength, wear resistance, penetration resistance, compactness, thermal stability and acid resistance of Example 2 are all the best.

Compared with the preparation method of mixing large particle size materials and small particle size materials separately and then making castables in Comparative Example 1, and the preparation method of mixing all solid raw materials before adding wet materials in Comparative Example 2 In the present invention, various materials are configured into two formulas according to the particle size and their respective physical properties. One formula is mainly composed of large and medium particle size materials, and the other is mainly composed of medium and small particle size materials. The two kinds of castables are used, and then the two kinds of castables are mixed to make the required acid-resistant castable; the structure of the acid-resistant castable is optimized to make the structure more compact, and the performance of the acid-resistant castable is improved.

Combined with the above comparative data, the acid-resistant castable prepared by the present invention has a compact structure, high strength, excellent wear resistance, good permeability resistance, high thermal stability, and good acid resistance. These advantages can well meet the use conditions of equipment linings , can effectively guarantee the safe and stable operation of the equipment, and help to achieve good economic and social benefits.

Claims (10)

1. An acid-resistant castable is characterized in that: comprises the following components in parts by weight: 45-75 parts of acid-resistant aggregate, 15-35 parts of acid-resistant powder, 5-10 parts of aluminate cement, 5-15 parts of binding agent, 5-7 parts of water and 3.02-6 parts of additive;

the acid-resistant aggregate is selected from one or more of recycled ceramics, corundum and flint clay;

the acid-resistant powder is one or more selected from silicon micropowder and activated alumina powder;

the binding agent is silica sol;

the additive comprises high temperature resistant fiber, dispersing agent and coagulant.

2. An acid resistant castable according to claim 1, wherein: the acid-resistant aggregate comprises the following components:

25-35 parts of granularity of 3-5 mm;

10-20 parts of particles with the granularity of 1-3 mm;

10-20 parts of particles with the granularity of 0.1-1 mm.

3. An acid resistant castable according to claim 1, wherein: the acid-resistant powder comprises the following components:

10-20 parts of silicon micropowder;

5-15 parts of active alumina powder.

4. An acid resistant castable according to claim 1, wherein: the additive comprises the following components:

3-5 parts of high-temperature resistant fibers;

0.01-0.5 parts of dispersing agent;

0.01-0.5 parts of coagulant.

5. An acid resistant castable according to claim 1, wherein: the content of alumina in the reclaimed ceramic is more than 90%; the corundum is sintered corundum; the silicon micropowder is made from high-siliceous waste powder.

6. An acid resistant castable according to claim 1, wherein: siO of the silica sol ₂ The solid content is more than or equal to 40 percent.

7. An acid resistant castable according to claim 1, wherein: the dispersing agent is at least one of sodium hexametaphosphate, sodium tripolyphosphate and sodium citrate.

8. An acid resistant castable according to claim 1, wherein: the coagulant is at least one of magnesium oxide and magnesium hydroxide.

9. The method for preparing the acid-resistant castable according to any one of claims 1 to 8, wherein the method is characterized by comprising the following steps: the method comprises the following steps:

s1, uniformly stirring recycled ceramics, corundum, flint clay, silica micropowder, activated alumina powder, aluminate cement, water, silica sol, high-temperature resistant fibers, a dispersing agent and a coagulant in a stirrer to obtain a mixed material 1; in the step, the acid-resistant aggregate with the granularity of 0.1-5 mm accounts for 75-90% of the total acid-resistant aggregate, the acid-resistant powder accounts for 15-25% of the total acid-resistant powder, the aluminate cement accounts for 80-95% of the total aluminate cement, the silica sol accounts for 5-15% of the total silica sol, the high-temperature resistant fiber accounts for 70-85% of the total high-temperature resistant fiber, the dispersant accounts for 70-85% of the dispersant, the coagulant accounts for 70-85% of the total coagulant, and the water accounts for 40-60% of the total water;

s2, uniformly stirring corundum, flint clay, silica micropowder, activated alumina powder, aluminate cement, water, silica sol, high-temperature resistant fiber, dispersing agent and coagulant in a stirrer to obtain a mixed material 2; in the step, the dosages of acid-resistant aggregate, acid-resistant powder, aluminate cement, silica sol, high-temperature resistant fiber, dispersing agent, coagulant and water are the rest;

and S3, further uniformly mixing the mixed material 1 and the mixed material 2 to obtain the castable.

10. The method for preparing the acid-resistant castable according to claim 9, wherein: in the step S1, the granularity of the recovered ceramic is 3-5 mm, and the usage amount of the recovered ceramic is more than 95% of the total amount of the recovered ceramic; the granularity of the corundum is 1-3 mm, and the usage amount of the corundum accounts for 75-85% of the total amount of the corundum; the granularity of the flint clay is 0.1-1 mm, and the usage amount of the flint clay accounts for 45-55% of the total amount of the flint clay; the usage amount of the silicon micro powder is 15-25% of the total amount of the silicon micro powder; the usage amount of the activated alumina powder is 15-25% of the total amount of the activated alumina powder.