CN110627482A - Environment-friendly high-compactness magnesia-alumina brick for RH refining furnace and preparation method thereof - Google Patents
Environment-friendly high-compactness magnesia-alumina brick for RH refining furnace and preparation method thereof Download PDFInfo
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- CN110627482A CN110627482A CN201911011629.5A CN201911011629A CN110627482A CN 110627482 A CN110627482 A CN 110627482A CN 201911011629 A CN201911011629 A CN 201911011629A CN 110627482 A CN110627482 A CN 110627482A
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- 239000011449 brick Substances 0.000 title claims abstract description 59
- 238000007670 refining Methods 0.000 title claims abstract description 27
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000000843 powder Substances 0.000 claims abstract description 68
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 44
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 36
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 36
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 36
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 36
- 239000002245 particle Substances 0.000 claims abstract description 23
- 235000019580 granularity Nutrition 0.000 claims abstract description 18
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 14
- 239000010431 corundum Substances 0.000 claims abstract description 14
- 238000000227 grinding Methods 0.000 claims abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 7
- 229910052580 B4C Inorganic materials 0.000 claims abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 6
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 22
- 238000000465 moulding Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 2
- 239000002905 metal composite material Substances 0.000 claims 2
- 239000002893 slag Substances 0.000 claims 2
- 239000011819 refractory material Substances 0.000 abstract description 7
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 abstract description 6
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 abstract description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 229910052804 chromium Inorganic materials 0.000 abstract description 4
- 239000011651 chromium Substances 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 230000035939 shock Effects 0.000 abstract description 4
- 230000003628 erosive effect Effects 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 4
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- QHPQWRBYOIRBIT-UHFFFAOYSA-N 4-tert-butylphenol Chemical compound CC(C)(C)C1=CC=C(O)C=C1 QHPQWRBYOIRBIT-UHFFFAOYSA-N 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3821—Boron carbides
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
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- C04B2235/402—Aluminium
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Abstract
The invention relates to the technical field of refractory materials, in particular to an environment-friendly high-compactness magnesia-alumina brick for an RH refining furnace and a preparation method thereof. The feed comprises the following raw materials in parts by weight: 70-80 parts of magnesia particles; 20-30 parts of magnesia fine powder; 10-15 parts of corundum fine powder; 3-6 parts of a binder; 25-40 parts of co-ground powder; the magnesite grain adopts sintered or electric melting MgO, including MgO with three granularity levels of 5-3 mm, 3-1 mm and <1 mm. In the RH refining furnace, the high-compactness aluminum-magnesia brick replaces a chromium-containing refractory material, so that the harm of hexavalent chromium to human bodies and the environment is eliminated; when the high-compactness aluminum-magnesia brick is produced, the porosity is reduced by adopting a mode of compositely adding magnesia with different granularities; meanwhile, the co-grinding powder of silica fume, aluminum powder, boron carbide and the like is introduced, which is beneficial to improving the erosion resistance, thermal shock resistance and oxidation resistance of the aluminum-magnesium brick.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to an environment-friendly high-compactness magnesia-alumina brick for an RH refining furnace and a preparation method thereof.
Background
The RH refining furnace is an important device in steel making, the inner lining of the RH refining furnace is mainly made of sintered magnesia-chrome bricks at present, but hexavalent chromium in the magnesia-chrome bricks can cause environmental pollution in the production process and the use process and is harmful to human bodies, and the use of the magnesia-chrome bricks is forbidden in many developed countries in the world. The refractory material of the RH refining furnace has become a trend without chromium and is more and more emphasized.
Therefore, the chromium-free refractory material is used on an RH refining furnace instead of a magnesia-chrome brick, the harm of hexavalent chromium to the environment and human bodies is eliminated, and the protection of the environment and the human health is a problem which needs to be solved urgently.
Disclosure of Invention
The invention provides an environment-friendly high-compactness magnesia-alumina brick for an RH refining furnace and a preparation method thereof, which are used for replacing a magnesia-chrome brick to be used on the RH refining furnace, and the performance is improved, the density and the oxidation resistance are greatly enhanced, and the high-temperature strength and the thermal shock resistance are obviously improved.
The technical scheme of the invention is realized as follows:
an environment-friendly high-compactness magnesia-alumina brick for an RH refining furnace comprises the following raw materials in parts by weight:
the magnesite grain adopts sintered or electric melting MgO, including MgO with three granularity levels of 5-3 mm, 3-1 mm and <1 mm.
The fine magnesia powder is sintered or fused MgO with the granularity less than or equal to 0.074 mm.
The corundum fine powder is Al with the granularity of less than or equal to 0.074mm and corundum fine powder2O3≥96％。
The binder comprises one or more of phenolic resin, anthracene oil, caprolactam and p-tert butyl phenol.
The co-milled powder is silica fume (SiO)285.00 percent) of the powder, one or a mixture of more than 400 percent of aluminum powder, silicon powder-aluminum powder composite powder and boron carbide, and the granularity is less than 0.074 mm.
A preparation method of an environment-friendly high-compactness magnesia-alumina brick for an RH refining furnace specifically comprises the following steps:
(1) crushing the fused magnesia, and then screening to obtain three magnesia particles with the particle sizes of 5-3 mm, 3-l mm and less than l mm;
(2) finely grinding the crushed and screened part of the magnesite grains into magnesite fine powder with the grain size less than or equal to 0.074 mm;
(3) respectively measuring magnesite particles with different granularities according to the proportion requirement, adding 70-80 parts of magnesite particles, 15-20 parts of magnesite fine powder and 10-15 parts of corundum fine powder into a high-speed mixing mill for low-speed mixing for 10-20 minutes, and then adding a binder for low-speed mixing for 2-5 minutes to prepare pug;
(4) adding 25-40 parts of the co-milled powder into the pug in the high-speed mixing mill, and mixing at a high speed for 10-15 minutes to fully mix the co-milled powder and the pug;
(5) after the pug and the co-ground powder are fully mixed, the pug is molded on a brick molding press of 1000 tons, the press requires external brick discharging and vacuum pumping, the molding operation requires that four corners are raked, and the operation is carried out according to the principle of light weight and heavy weight;
(6) firing and drying the formed green brick at the temperature of 300-500 ℃ to prepare the environment-friendly high-compactness magnesia-alumina brick for the RH refining furnace;
compared with the prior art, the invention has the beneficial effects that:
in the RH refining furnace, the high-compactness aluminum-magnesia brick replaces a chromium-containing refractory material, so that the harm of hexavalent chromium to human bodies and the environment is eliminated; when the high-compactness aluminum-magnesia brick is produced, the porosity is reduced by adopting a mode of compositely adding magnesia with different granularities; meanwhile, the co-grinding powder of silica fume, aluminum powder, boron carbide and the like is introduced, which is beneficial to improving the erosion resistance, thermal shock resistance and oxidation resistance of the aluminum-magnesium brick.
Detailed Description
The following further illustrates embodiments of the invention, but is not intended to limit the scope thereof:
an environment-friendly high-compactness magnesia-alumina brick for an RH refining furnace comprises the following raw materials in parts by weight:
the magnesite grain adopts sintered or electric melting MgO, including MgO with three granularity levels of 5-3 mm, 3-1 mm and <1 mm.
The fine magnesia powder is sintered or fused MgO with the granularity less than or equal to 0.074 mm.
The corundum fine powder is Al with the granularity of less than or equal to 0.074mm and corundum fine powder2O3≥96％。
The binder comprises one or more of phenolic resin, anthracene oil, caprolactam and p-tert butyl phenol.
The co-grinding powder is one or a mixture of more than 400 percent of silica fume (SiO2 is 85.00 percent), aluminum powder, silicon powder-aluminum powder composite powder and boron carbide, and the granularity is less than 0.074 mm.
A preparation method of an environment-friendly high-compactness magnesia-alumina brick for an RH refining furnace specifically comprises the following steps:
(1) crushing the fused magnesia, and then screening to obtain three magnesia particles with the particle sizes of 5-3 mm, 3-l mm and less than l mm;
(2) finely grinding the crushed and screened part of the magnesite grains into magnesite fine powder with the grain size less than or equal to 0.074 mm;
(3) respectively measuring magnesite particles with different granularities according to the proportion requirement, adding 70-80 parts of magnesite particles, 15-20 parts of magnesite fine powder and 10-15 parts of corundum fine powder into a high-speed mixing mill for low-speed mixing for 10-20 minutes, and then adding a binder for low-speed mixing for 2-5 minutes to prepare pug;
(4) adding 25-40 parts of the co-milled powder into the pug in the high-speed mixing mill, and mixing at a high speed for 10-15 minutes to fully mix the co-milled powder and the pug;
(5) after the pug and the co-ground powder are fully mixed, the pug is molded on a brick molding press of 1000 tons, the press requires external brick discharging and vacuum pumping, the molding operation requires that four corners are raked, and the operation is carried out according to the principle of light weight and heavy weight;
(6) and firing and drying the formed green brick at the temperature of 300-500 ℃ to obtain the environment-friendly high-compactness magnesia-alumina brick for the RH refining furnace.
Example 1:
when the requirements on strength and compactness of the manufactured aluminum-magnesium brick are slightly low, a preparation method for reducing the mass ratio of the co-milled powder is adopted, and the raw materials are added in the proportion as follows: 71 parts of magnesite grains, 20 parts of magnesite fine powder, 11 parts of corundum fine powder, 25 parts of co-ground powder and 5 parts of adhesive. Then the environment-friendly high-compactness magnesia-alumina brick is prepared by the following steps:
(1) crushing the fused magnesia, and then screening to obtain three magnesia particles with the particle sizes of 5-3 mm, 3-l mm and less than l mm;
(2) finely grinding the crushed and screened part of the magnesite grains into magnesite fine powder with the grain size less than or equal to 0.074 mm;
(3) after magnesite grains with different granularities are respectively measured according to the proportion requirement, 71 parts of magnesite grains, 20 parts of magnesite fine powder and 11 parts of corundum fine powder are added into a high-speed mixing roll to be mixed for 10-20 minutes at a low speed, and then 5 parts of binder is added to be mixed for 2-5 minutes at a low speed to prepare pug;
(4) adding 25 parts of co-milled powder into pug in a high-speed mixing roll, and mixing at a high speed for 10-15 minutes to fully mix the co-milled powder and the pug;
(5) after the pug and the co-ground powder are fully mixed, the pug is molded on a brick molding press of 1000 tons, the press requires external brick discharging and vacuum pumping, the molding operation requires that four corners are raked, and the operation is carried out according to the principle of light weight and heavy weight;
(6) and firing and drying the formed green brick at the temperature of 300-500 ℃ to obtain the environment-friendly high-compactness magnesia-alumina brick for the RH refining furnace.
Example 2:
when the requirements on strength and compactness of the manufactured aluminum-magnesium brick are slightly low, a preparation method for reducing the mass ratio of the co-milled powder is adopted, and the raw materials are added in the proportion as follows: 75 parts of magnesite grains, 26 parts of magnesite fine powder, 13 parts of corundum fine powder, 30 parts of co-ground powder and 6 parts of adhesive. Then the environment-friendly high-compactness magnesia-alumina brick is prepared by the following steps:
(1) crushing the fused magnesia, and then screening to obtain three magnesia particles with the particle sizes of 5-3 mm, 3-l mm and less than l mm;
(2) finely grinding the crushed and screened part of the magnesite grains into magnesite fine powder with the grain size less than or equal to 0.074 mm;
(3) after the magnesite grains with different granularities are respectively measured according to the proportion requirement, 75 parts of magnesite grains, 26 parts of magnesite fine powder and 13 parts of corundum fine powder are added into a high-speed mixing roll to be mixed for 10-20 minutes at a low speed, and then 6 parts of binder is added to be mixed for 2-5 minutes at a low speed to prepare pug;
(4) adding 30 parts of co-milled powder into pug in a high-speed mixing roll, and mixing at a high speed for 10-15 minutes to fully mix the co-milled powder and the pug;
(5) after the pug and the co-ground powder are fully mixed, the pug is molded on a brick molding press of 1000 tons, the press requires external brick discharging and vacuum pumping, the molding operation requires that four corners are raked, and the operation is carried out according to the principle of light weight and heavy weight;
(6) and firing and drying the formed green brick at the temperature of 300-500 ℃ to obtain the environment-friendly high-compactness magnesia-alumina brick for the RH refining furnace.
Example 3:
when the requirements on strength and compactness of the manufactured aluminum-magnesium brick are slightly low, a preparation method for reducing the mass ratio of the co-milled powder is adopted, and the raw materials are added in the proportion as follows: 78 parts of magnesite grains, 28 parts of magnesite fine powder, 15 parts of corundum fine powder, 38 parts of co-ground powder and 5 parts of adhesive. Then the environment-friendly high-compactness magnesia-alumina brick is prepared by the following steps:
(1) crushing the fused magnesia, and then screening to obtain three magnesia particles with the particle sizes of 5-3 mm, 3-l mm and less than l mm;
(2) finely grinding the crushed and screened part of the magnesite grains into magnesite fine powder with the grain size less than or equal to 0.074 mm;
(3) after magnesia particles with different granularities are respectively measured according to the proportion requirement, 78 parts of magnesia particles, 28 parts of magnesia fine powder and 15 parts of corundum fine powder are added into a high-speed mixing roll to be mixed for 10-20 minutes at a low speed, and then 5 parts of binder is added to be mixed for 2-5 minutes at a low speed to prepare pug;
(4) adding 38 parts of the co-milled powder into the pug in the high-speed mixing roll, and mixing at a high speed for 10-15 minutes to fully mix the co-milled powder and the pug;
(5) after the pug and the co-ground powder are fully mixed, the pug is molded on a brick molding press of 1000 tons, the press requires external brick discharging and vacuum pumping, the molding operation requires that four corners are raked, and the operation is carried out according to the principle of light weight and heavy weight;
(6) and firing and drying the formed green brick at the temperature of 300-500 ℃ to obtain the environment-friendly high-compactness magnesia-alumina brick for the RH refining furnace.
In the RH refining furnace, the high-compactness aluminum-magnesia brick is used for replacing a chromium-containing refractory material, so that the harm of hexavalent chromium to human bodies and the environment is eliminated; when the high-compactness aluminum-magnesia brick is produced, the porosity is reduced by adopting a mode of compositely adding magnesia with different granularities; meanwhile, the co-grinding powder of silica fume, aluminum powder, boron carbide and the like is introduced, which is beneficial to improving the erosion resistance, thermal shock resistance and oxidation resistance of the aluminum-magnesium brick.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. The environment-friendly high-compactness magnesia-alumina brick for the RH refining furnace is characterized by comprising the following raw materials in parts by weight:
2. the environment-friendly high-compactness magnesia-alumina brick for the RH refining furnace according to claim 1, wherein the co-ground powder is one or a mixture of more of silica fume, aluminum powder, silicon powder-aluminum powder composite powder and boron carbide, and the particle size is less than 0.074 mm.
3. The environment-friendly high-compactness magnesia-alumina brick for the RH refining furnace as claimed in claim 2, wherein the SiO2 mass percent content of the silica fume is not less than 85.00%, and the grain size thereof is not less than 400.
4. The metal composite low-carbon magnesia carbon brick for the ladle slag line according to claim 1, wherein the magnesia particles are sintered or fused MgO, and the MgO comprises MgO with three particle sizes of 5-3 mm, 3-1 mm and <1 mm.
5. The metal composite low-carbon magnesia carbon brick for the ladle slag line according to claim 1, wherein the magnesia fine powder is sintered or electrofused MgO with the particle size of less than or equal to 0.074 mm.
6. The preparation method of the environment-friendly high-compactness magnesia-alumina brick for the RH refining furnace as recited in claim 1, which is characterized by comprising the following steps:
1) crushing the fused magnesia, and then screening to obtain three magnesia particles with the particle sizes of 5-3 mm, 3-1 mm and less than 1 mm;
2) finely grinding the crushed and screened part of the magnesite grains into magnesite fine powder with the grain size less than or equal to 0.074 mm;
3) after the magnesite grains with different granularities are respectively measured according to the proportion, 70-80 parts of magnesite grains, 15-20 parts of magnesite fine powder and 10-15 parts of corundum fine powder are added into a high-speed mixing roll to be mixed for 10-20 minutes at a low speed, and then a binder is added to be mixed for 2-5 minutes at a low speed to prepare pug;
4) adding 25-40 parts of co-milled powder into pug in a high-speed mixing mill, and mixing at a high speed for 10-15 minutes to fully mix the co-milled powder and the pug;
5) after the pug and the co-ground powder are fully mixed, the pug is molded on a brick molding press of 1000 tons, the press requires external brick discharging and vacuum pumping, the molding operation requires that four corners are raked, and the operation is carried out according to the principle of light weight and heavy weight;
6) and firing and drying the formed green brick at the temperature of 300-500 ℃ to obtain the environment-friendly high-compactness magnesia-alumina brick for the RH refining furnace.
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Application publication date: 20191231 |