Ultra-clean anti-corrosion filtering material for blast furnace gas

Abstract

The invention discloses a blast furnace gas ultra-clean corrosion-resistant filtering material, and relates to the technical field of filtering materials. The invention discloses an ultra-clean anti-corrosion filtering material for blast furnace gas. The ultra-clean anti-corrosion filtering material is a porous ceramic material. The preparation method of the porous ceramic material comprises the following steps: uniformly dispersing aggregate, a high-temperature binder and an additive, adding a pore-forming agent, uniformly dispersing, and sieving to obtain powder; performing compression molding on the powder, and performing high-temperature sintering to obtain a porous ceramic material; the admixture accounts for 7-10% of the total mass of the powder; the porous ceramic material prepared by the invention is used as a porous ceramic filter element for removing dust particles and harmful gas in high-temperature coal gas, and has the properties of high strength, good high-temperature thermal shock resistance, small thermal expansion coefficient and high filtering precision.

Description

Technical Field

[0001] The invention relates to the technical field of filter materials, and in particular to an ultra-clean and corrosion-resistant filter material for blast furnace gas. Background Art

[0002] The steel industry is primarily based on blast furnace ironmaking. Coke, a primary raw material for the metallurgical industry, is used extensively by ironmakers. Coking coal, under complex geological conditions, contains hundreds of components. As this coal forms coke in the coke oven, many of these components are transported along with the gas to the next process. As user demands for gas quality continue to increase, processes for purifying and removing these various components have emerged. Traditional coke oven gas dust removal relies on a wet dust removal process using ammonia spray cooling. Before entering the gas header, the raw gas from the coke oven is sprayed with a large amount of ammonia, which condenses most of the tar mist and water vapor in the gas into liquid. Dust and coke powder are also captured, and water-soluble components in the gas are dissolved in the ammonia. This mixture of tar, ammonia, dust, and tar residue makes treatment extremely difficult and inefficient. Furthermore, suspended particulates remain in the gas after spray cooling, necessitating secondary dust removal. Traditional gas treatment processes suffer from low efficiency, cost, and secondary pollution. To eliminate these defects, high-temperature dry dust removal is currently used. The gas coming out of the coke oven is at a temperature of about 800°C. After preliminary cooling in the heat exchanger to about 550°C, it enters the cyclone dust collector for coarse particle dust removal, which can remove dust with a particle size of more than 30μm. The gas containing fine dust then enters the ceramic filter, and fine dust larger than 5μm is filtered out with an efficiency of more than 99%. It is then subjected to graded cooling to separate organic matter such as tar and naphthalene, as well as substances such as H2S and HCN step by step, ultimately obtaining high-quality clean gas.

[0003] Ceramic filters are made by tightly bonding aggregate particles such as aluminum oxide and silicon carbide with a binder, then pressing and sintering them. This creates numerous open pores of a defined size. Dust-laden gas passes through the filter layer, where dust particles are separated on the outer or inner surface. Porous ceramics are widely used due to their high-temperature and high-pressure resistance, resistance to acid and alkali corrosion, excellent thermal stability, and high filtration efficiency. However, existing ceramic filter materials utilize silica sol as a high-temperature binder during their preparation. During the sintering process, the silica sol migrates to the outer surface of the material, resulting in an uneven pore distribution and affecting the material's filtration performance. Summary of the Invention

[0004] The purpose of the present invention is to provide an ultra-clean and corrosion-resistant filter material for blast furnace gas to solve the following technical problems:

[0005] Existing ceramic filter materials use silica sol as a high-temperature adhesive during the preparation process. During the sintering process, the silica sol migrates to the outer surface of the material, resulting in uneven distribution of the pores of the filter material, affecting the filtration performance of the material.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An ultra-clean, corrosion-resistant filter material for blast furnace gas, wherein the corrosion-resistant filter material is a porous ceramic material;

[0008] The preparation method of the porous ceramic material comprises the following steps: uniformly dispersing aggregate, high-temperature binder, and admixture, adding a pore-forming agent, uniformly dispersing the mixture, and then sieving the mixture to obtain a powder; pressing the powder into a shape and sintering the powder at a high temperature to obtain the porous ceramic material; the admixture accounts for 7-10% of the total mass of the powder;

[0009] The preparation method of the admixture comprises the following steps:

[0010] S1: Add carboxymethyl cellulose and deionized water into a reactor, control the temperature at 50-60°C, disperse evenly, add potassium persulfate and methacrylic acid, and keep the temperature to react for 6-9 hours to obtain component 1;

[0011] S2: Add ethyl orthosilicate, deionized water, and anhydrous ethanol into a reactor and disperse evenly. Adjust the pH to 4-5, hydrolyze for 1-3 hours, add γ-methacryloxypropyltrimethoxysilane, and continue the reaction for 1-3 hours to obtain component 2.

[0012] S3: Add component 1, component 2, sodium dodecyl sulfate, OP-10, and deionized water into a reactor and disperse them evenly. Control the temperature at 70-80°C. Add potassium persulfate component 1, methyl methacrylate, and methacrylic acid. Keep the temperature at 80-90°C and keep the temperature at 0.5-1h. Add potassium persulfate component 2 and keep the temperature at 0.5-1h. Adjust the pH to 9-10 and keep the temperature at 1-3h. Filter to obtain the admixture.

[0013] As a further embodiment of the present invention, the mass ratio of carboxymethyl cellulose, deionized water, potassium persulfate, and methacrylic acid in S1 is 1:10-50:0.1-0.2:0.1-0.2.

[0014] As a further embodiment of the present invention, the mass ratio of ethyl orthosilicate, deionized water, anhydrous ethanol, and γ-methacryloxypropyltrimethoxysilane in S2 is 1:2-4:2-4:0.04-0.2.

[0015] As a further embodiment of the present invention, the mass ratio of component one, component two, sodium dodecyl sulfate, OP-10, deionized water, potassium persulfate component one, methyl methacrylate, methacrylic acid, and potassium persulfate component two is 1:1-3:0.01-0.03:0.02-0.04:2-3:0.002-0.004:0.3-1.2:0.6-1:0.005-0.01.

[0016] As a further solution of the present invention: the aggregate accounts for 75-80% of the total mass of the powder; the aggregate is corundum powder.

[0017] As a further solution of the present invention: the high-temperature binder accounts for 5-8% of the total mass of the powder; the high-temperature binder is kaolin and potassium feldspar in a mass ratio of 2:2-3.

[0018] As a further solution of the present invention: the pore-forming agent accounts for 8-12% of the total mass of the powder; the pore-forming agent is obtained by mixing flake graphite and granular activated carbon in a mass ratio of 1:1-1.1; the size of the flake graphite is 20-40um; the particle size of the granular activated carbon is 100-120um.

[0019] As a further solution of the present invention, the specific steps of compression molding are: placing the powder in a mold, placing the mold in a static press and pressurizing the mold, the molding pressure is 6-12 MPa, and the pressure is maintained for 5-10 seconds.

[0020] As a further solution of the present invention: the specific steps of high-temperature sintering are: the pressed green body is placed in a muffle furnace, the heating rate is controlled at 5-10°C / min, the temperature is raised to 800-900°C, and the temperature is kept at this temperature for 30-60 minutes; the heating rate is further controlled at 5-10°C / min, the temperature is raised to 1250-1350°C, and the temperature is kept at this temperature for 45-60 minutes.

[0021] Beneficial effects of the present invention:

[0022] This application uses carboxymethyl cellulose and methacrylic acid as raw materials, and under the catalysis of potassium persulfate, prepares component one; then uses tetraethyl orthosilicate and γ-methacryloxypropyltrimethoxysilane as raw materials to prepare silica sol as component two; finally, copolymerizes with acrylic acid monomer, and adds components one and two during the preparation process to prepare an admixture. This application uses corundum particles as aggregate, and adds high-temperature binders, admixtures, and pore-forming agents before molding. Due to the high melting point and sintering temperature of the alumina in the corundum particles, the addition of high-temperature binders and admixtures effectively improves the plasticity, fluidity, and sintering properties of the powder.

[0023] This application uses potassium feldspar and kaolin as high-temperature sintering agents, and corundum particles as aggregates are evenly bonded together by high-temperature binders to form a skeleton structure of porous ceramics, which not only improves the fluidity of the slurry, but also reduces the firing temperature; the high-temperature binder can partially play a supporting role during the molding process; after high-temperature melting, it provides some space, which helps to increase the porosity; and the melted components are coated on the surface of the aggregate particles. The high-temperature binder forms a glass phase at the firing temperature, so that the contact parts of the particles are bonded to each other to form a whole.

[0024] The admixture of the present application is based on carboxymethyl cellulose. Carboxymethyl cellulose, silica sol, and acrylic monomer are copolymerized to prepare the admixture. The admixture prepared in the present application is added to the powder to give the material good dispersibility and adhesion. The polymer in the admixture of the present application gives the material good toughness and impact resistance, effectively improving the problems of ceramic brittleness and poor thermal shock resistance, and strengthening and toughening the material; and during the high-temperature sintering process of the green body, the silica sol in the admixture prepared in the present application is uniformly dispersed inside the green body under the restriction of carboxymethyl cellulose, and constructs a porous structure together with the corundum particles; and as the sintering proceeds, SiC particles are generated, giving the material the characteristics of high porosity, high-temperature thermal shock resistance, and a small thermal expansion coefficient.

[0025] The porous ceramic prepared in this application has high porosity and a large operating pressure differential, resulting in greater flow and higher filtration efficiency. As a porous ceramic filter element for removing dust particles and harmful gases from high-temperature coal gas, it exhibits high strength, excellent high-temperature thermal shock resistance, a low thermal expansion coefficient, and high filtration precision. The porous ceramic filter material prepared in this application can meet the requirements for filtering high-temperature coal gas. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0027] The preparation method of the admixture of embodiment 1 comprises the following steps:

[0028] S1: Add 10 g of carboxymethyl cellulose and 100 mL of deionized water into a reactor, control the temperature at 50°C, disperse evenly, add 1 g of potassium persulfate and 1 g of methacrylic acid, and keep the temperature for 6 h to obtain component 1;

[0029] S2: 50 g of ethyl orthosilicate, 100 g of deionized water, and 100 g of anhydrous ethanol were added to a reactor and dispersed evenly. Hydrochloric acid was added to adjust the pH to 4, and the mixture was hydrolyzed for 1 h. 2 g of γ-methacryloyloxypropyltrimethoxysilane was added and the reaction was continued for 1 h to obtain component 2.

[0030] S3: Add 10 g of component 1, 10 g of component 2, 0.1 g of sodium dodecyl sulfate, 0.2 g of OP-10, and 20 mL of deionized water into a reactor and disperse them evenly. Control the temperature at 70°C, add 0.02 g of potassium persulfate, 3 g of methyl methacrylate, and 6 g of methacrylic acid, and keep the temperature for reaction for 1 hour. Control the temperature at 80°C and keep the temperature for reaction for 0.5 hour. Add 0.05 g of potassium persulfate and keep the temperature for reaction for 0.5 hour. Add ammonia water to adjust the pH to 9, keep the temperature for reaction for 1 hour, filter, and obtain the admixture.

[0031] The preparation method of the admixture of embodiment 2 comprises the following steps:

[0032] S1: Add 10 g of carboxymethyl cellulose and 300 mL of deionized water into a reactor, control the temperature at 55°C, disperse evenly, add 1.5 g of potassium persulfate and 1.5 g of methacrylic acid, and keep the temperature for 6 h to obtain component 1;

[0033] S2: 50 g of ethyl orthosilicate, 100 g of deionized water, and 100 g of anhydrous ethanol were added to a reactor and dispersed evenly. Hydrochloric acid was added to adjust the pH to 4, and the mixture was hydrolyzed for 3 h. 6 g of γ-methacryloyloxypropyltrimethoxysilane was added and the reaction was continued for 2 h to obtain component 2.

[0034] S3: Add 10 g of component 1, 10 g of component 2, 0.1 g of sodium dodecyl sulfate, 0.2 g of OP-10, and 20 mL of deionized water into a reactor and disperse them evenly. Control the temperature at 75°C, add 0.02 g of potassium persulfate, 5 g of methyl methacrylate, and 8 g of methacrylic acid, and keep the temperature for reaction for 2 h. Control the temperature at 85°C and keep the temperature for reaction for 1 h. Add 0.05 g of potassium persulfate and keep the temperature for reaction for 1 h. Add ammonia water to adjust the pH to 10, keep the temperature for reaction for 2 h, filter, and obtain the admixture.

[0035] The preparation method of the admixture of embodiment 3 comprises the following steps:

[0036] S1: Add 10 g of carboxymethyl cellulose and 500 mL of deionized water into a reactor, control the temperature at 60°C, disperse evenly, add 2 g of potassium persulfate and 2 g of methacrylic acid, and keep the temperature to react for 9 h to obtain component 1;

[0037] S2: 50 g of ethyl orthosilicate, 100 g of deionized water, and 100 g of anhydrous ethanol were added to a reactor and dispersed evenly. Hydrochloric acid was added to adjust the pH to 5, and the mixture was hydrolyzed for 3 h. 10 g of γ-methacryloyloxypropyltrimethoxysilane was added and the reaction was continued for 3 h to obtain component 2.

[0038] S3: Add 10 g of component 1, 10 g of component 2, 0.1 g of sodium dodecyl sulfate, 0.2 g of OP-10, and 20 mL of deionized water into a reactor and disperse them evenly. Control the temperature at 80°C, add 0.02 g of potassium persulfate, 12 g of methyl methacrylate, and 10 g of methacrylic acid, and keep the temperature for reaction for 3 h. Control the temperature at 90°C, keep the temperature for reaction for 1 h, add 0.1 g of potassium persulfate, keep the temperature for reaction for 1 h, add ammonia water to adjust the pH to 10, keep the temperature for reaction for 3 h, filter, and obtain the admixture.

[0039] Example 4: A blast furnace gas ultra-clean anti-corrosion filter material is a porous ceramic material. The preparation method of the porous ceramic material comprises the following steps:

[0040] A1: 75 g of corundum powder (particle size 50 μm), 2 g of kaolin (particle size 50 μm), 3 g of potassium feldspar (particle size 50 μm), and 10 g of the admixture prepared in Example 1 were evenly dispersed, and 5 g of flake graphite (particle size 40 μm) and 5 g of granular activated carbon (particle size 100 μm) were added, the mixture was evenly dispersed, and the mixture was sieved to obtain a powder;

[0041] A2: Place the powder in a mold, and then place the mold in a static press for pressure molding at a molding pressure of 12 MPa. Maintain the pressure for 10 seconds to obtain a green body.

[0042] A3: The green body is placed in a muffle furnace and heated to 800°C at a rate of 5°C / min and kept at that temperature for 30 minutes. The green body is then heated to 1350°C at a rate of 5°C / min and kept at that temperature for 60 minutes to obtain a porous ceramic material.

[0043] Example 5: A blast furnace gas ultra-clean anti-corrosion filter material is a porous ceramic material. The preparation method of the porous ceramic material comprises the following steps:

[0044] A1: 75 g of corundum powder (particle size 50 μm), 2 g of kaolin (particle size 50 μm), 3 g of potassium feldspar (particle size 50 μm), and 10 g of the admixture prepared in Example 2 were evenly dispersed, and 5 g of flake graphite (particle size 40 μm) and 5 g of granular activated carbon (particle size 100 μm) were added, the mixture was evenly dispersed, and the mixture was sieved to obtain a powder;

[0045] A2: Place the powder in a mold, and then place the mold in a static press for pressure molding at a molding pressure of 12 MPa. Maintain the pressure for 10 seconds to obtain a green body.

[0046] A3: The green body is placed in a muffle furnace and heated to 800°C at a rate of 5°C / min and kept at that temperature for 30 minutes. The green body is then heated to 1350°C at a rate of 5°C / min and kept at that temperature for 60 minutes to obtain a porous ceramic material.

[0047] Example 6: A blast furnace gas ultra-clean anti-corrosion filter material is a porous ceramic material. The preparation method of the porous ceramic material comprises the following steps:

[0048] A1: 75 g of corundum powder (particle size 50 μm), 2 g of kaolin (particle size 50 μm), 3 g of potassium feldspar (particle size 50 μm), and 10 g of the admixture prepared in Example 3 were evenly dispersed, and 5 g of flake graphite (particle size 40 μm) and 5 g of granular activated carbon (particle size 100 μm) were added, the mixture was evenly dispersed, and then sieved to obtain a powder;

[0049] A2: Place the powder in a mold, and then place the mold in a static press for pressure molding at a molding pressure of 12 MPa. Maintain the pressure for 10 seconds to obtain a green body.

[0050] A3: The green body is placed in a muffle furnace and heated to 800°C at a rate of 5°C / min and kept at that temperature for 30 minutes. The green body is then heated to 1350°C at a rate of 5°C / min and kept at that temperature for 60 minutes to obtain a porous ceramic material.

[0051] The preparation method of the admixture of Comparative Example 1 comprises the following steps:

[0052] S1: 50 g of ethyl orthosilicate, 100 g of deionized water, and 100 g of anhydrous ethanol were added to a reactor and dispersed evenly. Hydrochloric acid was added to adjust the pH to 4. The mixture was hydrolyzed for 1 h. 2 g of γ-methacryloyloxypropyltrimethoxysilane was added and the reaction was continued for 1 h to obtain component 2.

[0053] S2: Add 10 g of carboxymethyl cellulose, 10 g of component 2, 0.1 g of sodium dodecyl sulfate, 0.2 g of OP-10, and 20 mL of deionized water into a reactor and disperse them evenly. Control the temperature at 70°C, add 0.02 g of potassium persulfate, 3 g of methyl methacrylate, and 6 g of methacrylic acid, and keep the reaction warm for 1 hour. Control the temperature at 80°C and keep the reaction warm for 0.5 hour. Add 0.05 g of potassium persulfate and keep the reaction warm for 0.5 hour. Add ammonia water to adjust the pH to 9, keep the reaction warm for 1 hour, filter, and obtain the admixture.

[0054] The preparation method of the admixture of Comparative Example 2 comprises the following steps:

[0055] S1: Add 10 g of carboxymethyl cellulose and 100 mL of deionized water into a reactor, control the temperature at 50°C, disperse evenly, add 1 g of potassium persulfate and 1 g of methacrylic acid, and keep the temperature for 6 h to obtain component 1;

[0056] S2: 50 g of ethyl orthosilicate, 100 g of deionized water, and 100 g of anhydrous ethanol were added to a reactor and dispersed evenly. Hydrochloric acid was added to adjust the pH to 4. The mixture was hydrolyzed for 1 h. 2 g of KH560 was added and the reaction was continued for 1 h to obtain component 2.

[0057] S3: Add 10 g of component 1, 10 g of component 2, 0.1 g of sodium dodecyl sulfate, 0.2 g of OP-10, and 20 mL of deionized water into a reactor and disperse them evenly. Control the temperature at 70°C, add 0.02 g of potassium persulfate, 3 g of methyl methacrylate, and 6 g of methacrylic acid, and keep the temperature for reaction for 1 hour. Control the temperature at 80°C and keep the temperature for reaction for 0.5 hour. Add 0.05 g of potassium persulfate and keep the temperature for reaction for 0.5 hour. Add ammonia water to adjust the pH to 9, keep the temperature for reaction for 1 hour, filter, and obtain the admixture.

[0058] The preparation method of the admixture of Comparative Example 3 comprises the following steps:

[0059] S1: Add 10 g of carboxymethyl cellulose and 100 mL of deionized water into a reactor, control the temperature at 50°C, disperse evenly, add 1 g of potassium persulfate and 1 g of methacrylic acid, and keep the temperature for 6 h to obtain component 1;

[0060] S2: 50 g of ethyl orthosilicate, 100 g of deionized water, and 100 g of anhydrous ethanol were added to a reactor and dispersed evenly. Hydrochloric acid was added to adjust the pH to 4, and the mixture was hydrolyzed for 1 h. 2 g of γ-methacryloyloxypropyltrimethoxysilane was added and the reaction was continued for 1 h to obtain component 2.

[0061] S3: Add 0.1 g of sodium dodecyl sulfate, 0.2 g of OP-10, and 20 mL of deionized water into a reactor and disperse them evenly. Control the temperature at 70°C, add 0.02 g of potassium persulfate, 3 g of methyl methacrylate, and 6 g of methacrylic acid, and keep the temperature for reaction for 1 hour. Control the temperature at 80°C and keep the temperature for reaction for 0.5 hour. Add 0.05 g of potassium persulfate and keep the temperature for reaction for 0.5 hour. Add ammonia water to adjust the pH to 9, keep the temperature for reaction for 1 hour, filter, add 10 g of component 1 and 10 g of component 2 and disperse them evenly to obtain an admixture.

[0062] Comparative Example 4

[0063] Comparative Example 4 is compared with Example 4, except that the admixture prepared in Comparative Example 1 added in Example 4 is replaced by the admixture prepared in Comparative Example 1 in equal amount, and its components and preparation method are completely consistent with those of Example 4.

[0064] Comparative Example 5

[0065] Comparative Example 5 is compared with Example 4, except that the admixture prepared in Comparative Example 1 added in Example 4 is replaced by the admixture prepared in Comparative Example 2 in equal amount. The components and preparation method are completely consistent with those of Example 4.

[0066] Comparative Example 6

[0067] Compared with Example 4, Comparative Example 6 is just the same as Example 4, except that the admixture prepared in Comparative Example 1 added in Example 4 is replaced by the admixture prepared in Comparative Example 3 in equal amount. The components and preparation method are exactly the same as those in Example 4.

[0068] Performance testing

[0069] (1) Porosity: According to GB / T 1966-1996 “Test method for apparent porosity and bulk density of porous ceramics”, deionized water was used as the infiltrant, and the ceramic sample was vacuumed. The dry weight, wet weight, and load of the sample were then tested respectively. The open porosity ε was calculated according to the following formula:

[0070] ε=[(m2-m1) / (m2-m3)]×100%

[0071] Where, ε-open porosity, %; m1-dry weight, g; m2-wet weight, g; m3-floating weight, g; the calculation results are shown in Table 1;

[0072] (2) Flexural strength: The flexural strength of the samples was measured using the three-point bending method on a CTM 6203 micro-controlled electronic universal testing machine, and the flexural strength σ and elastic modulus E of the samples were calculated according to the following formula:

[0073] σ=3FL / (2bh 2 )

[0074] E=(P / δ)·[L / (4bh 3 )]

[0075] Where, σ is the flexural strength, MPa; F is the load at specimen fracture, N; L is the span, mm; b is the width of the specimen, mm; h is the height of the specimen, mm; P / δ is the slope of the displacement-load curve, N / mm;

[0076] (3) Thermal shock resistance: According to GB / T 16536-1996 “Test method for thermal shock resistance of engineering ceramics”, the residual strength was measured using the three-point bending method on a CTM 6203 micro-controlled electronic universal testing machine. The test steps are as follows: the fired porous ceramic sample with a size of 80 mm × 10 mm × 7 mm was placed in the furnace of the KRZ-S01 thermal shock resistance testing machine, and the temperature was raised to 400 °C, 600 °C, 800 °C, and 1000 °C at a controlled heating rate of 5 °C / min, respectively, and kept warm for 10 min; the sample was quickly taken out and placed in 20 °C water for quenching. After drying, the residual strength was measured with a span of 50 mm and a loading rate of 0.5 mm / min. The test results are shown in Table 1.

[0077] Table 1: Statistical table of performance test data of Examples 4-6 and Comparative Examples 4-6

[0078]

[0079] As can be seen from Table 1, the porous ceramic material prepared in this application as a blast furnace gas filter material not only has the characteristics of high filtration efficiency and excellent corrosion resistance, but also has good thermal shock resistance, and can maintain good filtration performance when filtering high-temperature gas.

[0080] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A blast furnace gas ultra-clean anti-corrosion filter material, characterized in that: The corrosion-resistant filter material is a porous ceramic material; The preparation method of the porous ceramic material comprises the following steps: uniformly dispersing aggregate, high-temperature binder, and admixture, adding pore-forming agent, uniformly dispersing, and then sieving to obtain powder; pressing the powder into shape, and sintering at high temperature to obtain the porous ceramic material; the admixture accounts for 7-10% of the total mass of the powder; The preparation method of the admixture comprises the following steps: S1: Add carboxymethyl cellulose and deionized water into a reactor, control the temperature at 50-60°C, disperse evenly, add potassium persulfate and methacrylic acid, and keep the temperature to react for 6-9 hours to obtain component 1; S2: Add ethyl orthosilicate, deionized water, and anhydrous ethanol into a reactor and disperse evenly. Adjust the pH to 4-5, hydrolyze for 1-3 hours, add γ-methacryloxypropyltrimethoxysilane, and continue the reaction for 1-3 hours to obtain component 2. S3: Add component 1, component 2, sodium dodecyl sulfate, OP-10, and deionized water into a reactor and disperse them evenly. Control the temperature at 70-80°C. Add potassium persulfate component 1, methyl methacrylate, and methacrylic acid. Keep the temperature at 80-90°C and keep the temperature at 0.5-1h. Add potassium persulfate component 2 and keep the temperature at 0.5-1h. Adjust the pH to 9-10 and keep the temperature at 1-3h. Filter to obtain the admixture.

2. The ultra-clean and corrosion-resistant filter material for blast furnace gas according to claim 1, characterized in that: The mass ratio of carboxymethyl cellulose, deionized water, potassium persulfate, and methacrylic acid in S1 is 1:10-50:0.1-0.2:0.1-0.

2.

3. The ultra-clean and corrosion-resistant filter material for blast furnace gas according to claim 1, characterized in that: The mass ratio of ethyl orthosilicate, deionized water, anhydrous ethanol, and γ-methacryloxypropyltrimethoxysilane in S2 is 1:2-4:2-4:0.04-0.

2.

4. The ultra-clean and corrosion-resistant filter material for blast furnace gas according to claim 1, characterized in that: The mass ratio of component one, component two, sodium dodecyl sulfate, OP-10, deionized water, potassium persulfate, component one, methyl methacrylate, methacrylic acid, potassium persulfate, component two is 1:1-3:0.01-0.03:0.02-0.04:2-3:0.002-0.004:0.3-1.2:0.6-1:0.005-0.

01.

5. The ultra-clean and corrosion-resistant filter material for blast furnace gas according to claim 1, characterized in that: The aggregate accounts for 75-80% of the total mass of the powder; the aggregate is corundum powder.

6. The ultra-clean and corrosion-resistant filter material for blast furnace gas according to claim 1, characterized in that: The high-temperature binder accounts for 5-8% of the total mass of the powder; the high-temperature binder is kaolin and potassium feldspar in a mass ratio of 2:2-3.

7. The ultra-clean and corrosion-resistant filter material for blast furnace gas according to claim 1, characterized in that: The pore-forming agent accounts for 8-12% of the total mass of the powder; the pore-forming agent is obtained by mixing flake graphite and granular activated carbon in a mass ratio of 1:1-1.1; the size of the flake graphite is 20-40um; the particle size of the granular activated carbon is 100-120um.

8. The ultra-clean and corrosion-resistant filter material for blast furnace gas according to claim 1, characterized in that: The specific steps of compression molding are: placing the powder in a mold, placing the mold in a static press and pressurizing the mold, the molding pressure is 6-12MPa, and the pressure is maintained for 5-10s.

9. The ultra-clean and corrosion-resistant filter material for blast furnace gas according to claim 1, characterized in that: The specific steps of high-temperature sintering are: the pressed green body is placed in a muffle furnace, the heating rate is controlled at 5-10℃ / min, the temperature is raised to 800-900℃, and the temperature is kept for 30-60min; the heating rate is continued to be controlled at 5-10℃ / min, the temperature is raised to 1250-1350℃, and the temperature is kept for 45-60min.

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