CN113292317A - Long-life VOD refining ladle molten pool magnesium-aluminum-carbon brick and preparation method thereof - Google Patents
Long-life VOD refining ladle molten pool magnesium-aluminum-carbon brick and preparation method thereof Download PDFInfo
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- CN113292317A CN113292317A CN202110630874.5A CN202110630874A CN113292317A CN 113292317 A CN113292317 A CN 113292317A CN 202110630874 A CN202110630874 A CN 202110630874A CN 113292317 A CN113292317 A CN 113292317A
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- fused
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- carbon
- white corundum
- magnesia
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- 239000011449 brick Substances 0.000 title claims abstract description 51
- 238000007670 refining Methods 0.000 title claims abstract description 23
- -1 magnesium-aluminum-carbon Chemical compound 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 72
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 56
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 54
- 239000010431 corundum Substances 0.000 claims abstract description 54
- 229910052751 metal Inorganic materials 0.000 claims abstract description 50
- 239000002184 metal Substances 0.000 claims abstract description 50
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 36
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 32
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000010439 graphite Substances 0.000 claims abstract description 22
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 22
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 22
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000005011 phenolic resin Substances 0.000 claims abstract description 19
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 19
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 19
- 239000000654 additive Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 230000000996 additive effect Effects 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims description 51
- 239000001095 magnesium carbonate Substances 0.000 claims description 35
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 35
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 35
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 35
- 229920005989 resin Polymers 0.000 claims description 31
- 239000011347 resin Substances 0.000 claims description 31
- 239000010426 asphalt Substances 0.000 claims description 18
- 238000000227 grinding Methods 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 238000003801 milling Methods 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 238000007580 dry-mixing Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000009847 ladle furnace Methods 0.000 claims description 4
- 230000035939 shock Effects 0.000 abstract description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 abstract description 3
- 239000011819 refractory material Substances 0.000 abstract description 2
- 238000005245 sintering Methods 0.000 abstract description 2
- 229910052596 spinel Inorganic materials 0.000 abstract description 2
- 239000011029 spinel Substances 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010459 dolomite Substances 0.000 description 3
- 229910000514 dolomite Inorganic materials 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- QLJOWVRCWDQCBG-UHFFFAOYSA-N [C].[Mg].[Ca] Chemical compound [C].[Mg].[Ca] QLJOWVRCWDQCBG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009261 transgenic effect Effects 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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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
- 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
-
- 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
- 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
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/402—Aluminium
-
- 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
- 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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
- C04B2235/425—Graphite
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/428—Silicon
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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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
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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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
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- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
- C04B2235/9615—Linear firing shrinkage
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to the technical field of refractory materials, in particular to a long-life VOD refining ladle furnace-use magnesium-aluminum carbon brick and a preparation method thereof, wherein the long-life VOD refining ladle furnace-use magnesium-aluminum carbon brick is prepared from the following raw materials in percentage by weight: 50-70% of fused magnesia, 10-20% of fused white corundum, 6-16% of crystalline flake graphite, 1-4% of metal silicon powder, 0.08-4% of metal aluminum powder, 1-10% of additive and 2-8% of thermosetting phenolic resin; according to the invention, alumina is introduced into a mature VOD ladle molten pool by using the low-carbon magnesia carbon brick, and spinel is produced by using the reaction of the magnesia and the alumina, so that the thermal shock stability and the sintering property of the molten pool brick are improved, and the prepared VOD ladle molten pool brick solves the problems of cracking and peeling caused by poor thermal shock stability of the conventional VOD ladle molten pool brick.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a long-life magnesium-aluminum-carbon brick for a VOD refining ladle molten pool and a preparation method thereof.
Background
The magnesite-chrome brick is firstly used for a VOD ladle working lining because of excellent slag resistance, but the magnesite-chrome brick is easy to strip and damage and has poor thermal shock resistance under the condition of VOD refining ladle intermittent working, and meanwhile, the chrome-free performance of the refractory industry is more and more urgent because of the environmental protection problem of hexavalent chromium. With the development of refractory technology, unburned magnesium-calcium-carbon bricks and unburned magnesium-dolomite bricks gradually replace magnesia-chrome bricks to become the preferred material for the inner lining of the VOD refining ladle. Because the unfired magnesia-calcium-carbon bricks and the unfired magnesia dolomite bricks are easy to pulverize and strip during intermittent production, the service life of the conventional stainless steel is short by replacing the unfired magnesia-calcium-carbon bricks and the unfired magnesia-white dolomite bricks with low-carbon magnesia-carbon bricks, especially VOD refining ladle molten pool bricks, so that the ton steel consumption of VOD refining ladle refractory is much higher than that of plain carbon steel.
In conclusion, the invention solves the existing problems by designing the long-life magnesium-aluminum-carbon brick for the VOD refining ladle molten pool and the preparation method thereof.
Disclosure of Invention
The present invention aims to provide a method for detecting transgenic food, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a long-life VOD refining ladle furnace bath magnesium aluminum carbon brick is prepared from the following raw materials in percentage by weight: 50-70% of fused magnesia, 10-20% of fused white corundum, 6-16% of crystalline flake graphite, 1-4% of metal silicon powder, 0.08-4% of metal aluminum powder, 1-10% of additive and 2-8% of thermosetting phenolic resin;
the grain size of the fused magnesia consists of: 20-25% of 5-3 mm fused magnesite, 10-15% of 3-1 mm fused magnesite, 10-15% of 1-0 mm fused magnesite and 10-15% of 200-mesh fused magnesite;
the grain size of the electric melting white corundum is as follows: 3-6% of 3-1 mm fused white corundum, 3-6% of 1-0 mm fused white corundum and 4-8% of 200-mesh fused white corundum.
In a preferred embodiment of the present invention, the additives are high-temperature asphalt powder and carbon-containing resin powder, and the ratio of the high-temperature asphalt powder to the carbon-containing resin powder is 1: (1-2) in the above ratio.
As a preferable scheme of the invention, the fixed carbon content of the crystalline flake graphite is more than or equal to 95%, the granularity of the metal silicon powder is 200 meshes, the granularity of the metal aluminum powder is 200 meshes, and the granularity of the carbon-containing resin powder is 200 meshes.
A long-life VOD refining ladle furnace-bath magnesium-aluminum carbon brick is prepared by the following specific steps:
s1, taking fused magnesia, fused white corundum, flaky graphite, high-temperature asphalt powder, carbon-containing resin powder, silicon metal, aluminum metal and thermosetting phenolic resin for later use;
s2, grinding the fused magnesite, and grading into four granular raw materials with different particle sizes of 5-3 mm, 3-1 mm, 1-0 mm and 200 meshes for later use;
s3, grinding the fused white corundum, and classifying into three granular raw materials with different particle sizes of 3-1 mm, 1-0 mm and 200 meshes for later use;
s4, grinding the metal silicon, the metal aluminum and the carbon-containing resin into fine powder with the particle size less than or equal to 200 meshes to obtain metal silicon powder, metal aluminum powder and carbon-containing resin powder for later use;
s5, taking 50-70% of fused magnesia, 10-20% of fused white corundum, 6-16% of crystalline flake graphite, 1-4% of metal silicon powder, 0.08-4% of metal aluminum powder, 1-10% of additive and 2-8% of thermosetting phenolic resin according to weight percentage;
s6, adding the fused magnesite of 5-3 mm, the fused magnesite of 3-1 mm, the fused magnesite of 1-0 mm, the fused white corundum of 3-1 mm, the fused white corundum of 1-0 mm and the flake graphite in the step c into a mixing mill, dry-mixing for 3-5 min, adding thermosetting phenolic resin, continuously mixing and milling for 5-10 min, finally adding the fused magnesite of 200 meshes, the fused white corundum of 200 meshes, metal silicon powder, metal aluminum powder, high-temperature asphalt powder and carbon-containing resin powder, and mixing and milling for 20min to obtain a pre-pressed material;
and S7, pressing and forming the pre-pressed material by a press to obtain the finished magnesia-alumina-carbon brick.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, alumina is introduced into a mature VOD ladle molten pool by using a low-carbon magnesia carbon brick, and spinel is produced by using the reaction of the magnesia and the alumina, so that the thermal shock stability and the sintering property of the molten pool brick are improved, and the prepared VOD ladle molten pool brick solves the problems of cracking and peeling caused by poor thermal shock stability of the conventional VOD ladle molten pool brick.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
The invention provides a technical scheme that:
a long-life VOD refining ladle furnace bath magnesium aluminum carbon brick is prepared from the following raw materials in percentage by weight: 50-70% of fused magnesia, 10-20% of fused white corundum, 6-16% of crystalline flake graphite, 1-4% of metal silicon powder, 0.08-4% of metal aluminum powder, 1-10% of additive and 2-8% of thermosetting phenolic resin;
the grain size of the fused magnesia consists of: 20-25% of 5-3 mm fused magnesite, 10-15% of 3-1 mm fused magnesite, 10-15% of 1-0 mm fused magnesite and 10-15% of 200-mesh fused magnesite;
the grain size of the electric melting white corundum is as follows: 3-6% of 3-1 mm fused white corundum, 3-6% of 1-0 mm fused white corundum and 4-8% of 200-mesh fused white corundum.
As a further aspect of the present invention, the additives are high-temperature asphalt powder and carbon-containing resin powder, and the ratio of the high-temperature asphalt powder to the carbon-containing resin powder is 1: (1-2) in the above ratio.
As a further scheme of the invention, the fixed carbon content of the crystalline flake graphite is more than or equal to 95%, the granularity of the metal silicon powder is 200 meshes, the granularity of the metal aluminum powder is 200 meshes, and the granularity of the carbon-containing resin powder is 200 meshes.
A long-life VOD refining ladle furnace-bath magnesium-aluminum carbon brick is prepared by the following specific steps:
s1, taking fused magnesia, fused white corundum, flaky graphite, high-temperature asphalt powder, carbon-containing resin powder, silicon metal, aluminum metal and thermosetting phenolic resin for later use;
s2, grinding the fused magnesite, and grading into four granular raw materials with different particle sizes of 5-3 mm, 3-1 mm, 1-0 mm and 200 meshes for later use;
s3, grinding the fused white corundum, and classifying into three granular raw materials with different particle sizes of 3-1 mm, 1-0 mm and 200 meshes for later use;
s4, grinding the metal silicon, the metal aluminum and the carbon-containing resin into fine powder with the particle size less than or equal to 200 meshes to obtain metal silicon powder, metal aluminum powder and carbon-containing resin powder for later use;
s5, taking 50-70% of fused magnesia, 10-20% of fused white corundum, 6-16% of crystalline flake graphite, 1-4% of metal silicon powder, 0.08-4% of metal aluminum powder, 1-10% of additive and 2-8% of thermosetting phenolic resin according to weight percentage;
s6, adding the fused magnesite of 5-3 mm, the fused magnesite of 3-1 mm, the fused magnesite of 1-0 mm, the fused white corundum of 3-1 mm, the fused white corundum of 1-0 mm and the flake graphite in the step c into a mixing mill, dry-mixing for 3-5 min, adding thermosetting phenolic resin, continuously mixing and milling for 5-10 min, finally adding the fused magnesite of 200 meshes, the fused white corundum of 200 meshes, metal silicon powder, metal aluminum powder, high-temperature asphalt powder and carbon-containing resin powder, and mixing and milling for 20min to obtain a pre-pressed material;
and S7, pressing and forming the pre-pressed material by a press to obtain the finished magnesia-alumina-carbon brick.
Detailed Description
Example 1:
a preparation method of a long-life VOD refining ladle molten pool magnesium-aluminum-carbon brick comprises the following steps:
a. taking fused magnesia, fused white corundum, flaky graphite, high-temperature asphalt powder, carbon-containing resin powder, metallic silicon, metallic aluminum and thermosetting phenolic resin for later use;
b. grinding the fused magnesia into 5-3 mm, 3-1 mm, 1-0 mm and 200-mesh particle raw materials for later use;
c, grinding the fused white corundum into three granular raw materials with different particle sizes of 3-1 mm, 1-0 mm and 200 meshes for later use;
d, grinding the metal silicon, the metal aluminum and the carbon-containing resin into fine powder with the particle size of less than or equal to 200 meshes to obtain metal silicon powder, metal aluminum powder and carbon-containing resin powder for later use;
e. taking 67% of fused magnesia, 18% of fused white corundum, 6% of crystalline flake graphite, 1% of metal silicon powder, 1% of metal aluminum powder, 3% of additive and 4% of thermosetting phenolic resin according to weight percentage;
the grain size of the fused magnesia consists of: 23% of 5-3 mm fused magnesite, 15% of 3-1 mm fused magnesite, 15% of 1-0 mm fused magnesite and 14% of 200-mesh fused magnesite.
The grain size of the electric melting white corundum is as follows: 5% of 3-1 mm fused white corundum, 5% of 1-0 mm fused white corundum and 8% of 200-mesh fused white corundum.
The additive is high-temperature asphalt powder and carbon-containing resin powder which are mixed according to the proportion of 1: 1;
f. adding the fused magnesia of 5-3 mm, the fused magnesia of 3-1 mm, the fused magnesia of 1-0 mm, the fused white corundum of 3-1 mm, the fused white corundum of 1-0 mm and the flake graphite in the step e into a mixing mill, dry-mixing for 3-5 min, adding thermosetting phenolic resin, continuously mixing and milling for 5-10 min, finally adding the fused magnesia of 200 meshes, the fused white corundum of 200 meshes, metallic silicon powder, metallic aluminum powder, high-temperature asphalt powder and carbon-containing resin powder, and mixing and milling for 20min to obtain a pre-pressed material;
g. and pressing and forming the pre-pressed material by a press to obtain a finished product of the magnesia-alumina-carbon brick.
Example 2:
a preparation method of a long-life VOD refining ladle molten pool magnesium-aluminum-carbon brick comprises the following steps:
a. taking fused magnesia, fused white corundum, flaky graphite, high-temperature asphalt powder, carbon-containing resin powder, metallic silicon, metallic aluminum and thermosetting phenolic resin for later use;
b. grinding the fused magnesia into 5-3 mm, 3-1 mm, 1-0 mm and 200-mesh particle raw materials for later use;
c, grinding the fused white corundum into three granular raw materials with different particle sizes of 3-1 mm, 1-0 mm and 200 meshes for later use;
d, grinding the metal silicon, the metal aluminum and the carbon-containing resin into fine powder with the particle size of less than or equal to 200 meshes to obtain metal silicon powder, metal aluminum powder and carbon-containing resin powder for later use;
e. 62 percent of fused magnesia, 16 percent of fused white corundum, 9 percent of crystalline flake graphite, 2 percent of metal silicon powder, 2 percent of metal aluminum powder, 6 percent of additive and 3 percent of thermosetting phenolic resin;
the grain size of the fused magnesia consists of: 25% of 5-3 mm fused magnesite, 13% of 3-1 mm fused magnesite, 13% of 1-0 mm fused magnesite and 11% of 200-mesh fused magnesite.
The grain size of the electric melting white corundum is as follows: 4% of 3-1 mm fused white corundum, 4% of 1-0 mm fused white corundum and 8% of 200-mesh fused white corundum.
The additive is high-temperature asphalt powder and carbon-containing resin powder which are mixed according to the proportion of 1: 2;
f. adding the fused magnesia of 5-3 mm, the fused magnesia of 3-1 mm, the fused magnesia of 1-0 mm, the fused white corundum of 3-1 mm, the fused white corundum of 1-0 mm and the flake graphite in the step e into a mixing mill, dry-mixing for 3-5 min, adding thermosetting phenolic resin, continuously mixing and milling for 5-10 min, finally adding the fused magnesia of 200 meshes, the fused white corundum of 200 meshes, metallic silicon powder, metallic aluminum powder, high-temperature asphalt powder and carbon-containing resin powder, and mixing and milling for 20min to obtain a pre-pressed material;
g. and pressing and forming the pre-pressed material by a press to obtain a finished product of the magnesia-alumina-carbon brick.
The products prepared in the above examples 1 and 2 were taken, and the performance test was carried out, and the parameters obtained were as follows:
the physical and chemical indexes of the brick are shown in the following table:
| item | Index (I) | Typical value |
| Compression strength/MPa at 200 ℃ for 24h | ≥35 | 52 |
| Flexural strength/MPa at 200 ℃ for 24h | ≥7 | 13 |
| Porosity at 200 ℃ for 24 h/%) | ≤5 | 1.7 |
| Volume density of 24 h/g.cm-3 multiplied by 200 DEG C | ≥2.8 | 3.03 |
| 1550 ℃ X3 h line Change% | 0～2 | 1.5 |
The using effect of the brick is compared with that of the traditional low-carbon magnesia carbon brick for a ladle molten pool under the current VOD refining condition, and the results are shown in the following table:
| item | The magnesia-alumina-carbon brick of the invention | Traditional low-carbon magnesia carbon brick |
| Compression strength/MPa at 200 ℃ for 24h | 52 | 48 |
| Flexural strength/MPa at 200 ℃ for 24h | 13 | 11 |
| Porosity at 200 ℃ for 24 h/%) | 1.7 | 1.7 |
| Volume density/g.cm multiplied by 24h at 200 DEG C-3 | 3.03 | 3.02 |
| Rate of change of 1500 ℃ X3 h line% | 1.5 | 1.6 |
| Erosion rate mm/furnace | 2.8 | 4.76 |
| Average number of VOD passing furnaces | 32 | 21 |
In the test process of smelting 316 series stainless steel in a certain steel mill, the magnesia-alumina carbon brick for the VOD ladle furnace has the advantages of uniform slag adhering on the surface of the furnace brick, slow erosion, no cracking, peeling and molten hole problems, excellent thermal shock stability and erosion resistance, and the average service life of VOD refining is 32 furnaces. From the experimental use effect of the magnesia-alumina-carbon brick, the use of the magnesia-alumina-carbon brick for the VOD ladle melting pool under the condition of ladle VOD refining can effectively prolong the service life of the melting pool brick, solve the problem of poor thermal shock stability of the melting pool brick and reduce the consumption of refractory per ton steel.
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 (4)
1. The long-life VOD refining ladle furnace-bath magnesium-aluminum carbon brick is characterized by being prepared from the following raw materials in percentage by weight: 50-70% of fused magnesia, 10-20% of fused white corundum, 6-16% of crystalline flake graphite, 1-4% of metal silicon powder, 0.08-4% of metal aluminum powder, 1-10% of additive and 2-8% of thermosetting phenolic resin;
the grain size of the fused magnesia consists of: 20-25% of 5-3 mm fused magnesite, 10-15% of 3-1 mm fused magnesite, 10-15% of 1-0 mm fused magnesite and 10-15% of 200-mesh fused magnesite;
the grain size of the electric melting white corundum is as follows: 3-6% of 3-1 mm fused white corundum, 3-6% of 1-0 mm fused white corundum and 4-8% of 200-mesh fused white corundum.
2. The long-life VOD refining ladle furnace bath magnesium-aluminum carbon brick as claimed in claim 1, characterized in that the additives are high-temperature asphalt powder and carbon-containing resin powder, and the high-temperature asphalt powder and the carbon-containing resin powder are mixed according to the weight ratio of 1: (1-2) in the above ratio.
3. The long-life VOD refining ladle molten pool magnesium-aluminum carbon brick as claimed in claim 1, is characterized in that the fixed carbon content of the scale graphite is not less than 95%, the granularity of the metal silicon powder is 200 meshes, the granularity of the metal aluminum powder is 200 meshes, and the granularity of the carbon-containing resin powder is 200 meshes.
4. The long-life VOD refining ladle furnace-bath magnesia-alumina-carbon brick as claimed in claim 1, the preparation method comprises the following steps:
s1, taking fused magnesia, fused white corundum, flaky graphite, high-temperature asphalt powder, carbon-containing resin powder, silicon metal, aluminum metal and thermosetting phenolic resin for later use;
s2, grinding the fused magnesite, and grading into four granular raw materials with different particle sizes of 5-3 mm, 3-1 mm, 1-0 mm and 200 meshes for later use;
s3, grinding the fused white corundum, and classifying into three granular raw materials with different particle sizes of 3-1 mm, 1-0 mm and 200 meshes for later use;
s4, grinding the metal silicon, the metal aluminum and the carbon-containing resin into fine powder with the particle size less than or equal to 200 meshes to obtain metal silicon powder, metal aluminum powder and carbon-containing resin powder for later use;
s5, taking 50-70% of fused magnesia, 10-20% of fused white corundum, 6-16% of crystalline flake graphite, 1-4% of metal silicon powder, 0.08-4% of metal aluminum powder, 1-10% of additive and 2-8% of thermosetting phenolic resin according to weight percentage;
s6, adding the fused magnesite of 5-3 mm, the fused magnesite of 3-1 mm, the fused magnesite of 1-0 mm, the fused white corundum of 3-1 mm, the fused white corundum of 1-0 mm and the flake graphite in the step 5 into a mixing mill, dry-mixing for 3-5 min, adding thermosetting phenolic resin, continuously mixing and milling for 5-10 min, finally adding the fused magnesite of 200 meshes, the fused white corundum of 200 meshes, metal silicon powder, metal aluminum powder, high-temperature asphalt powder and carbon-containing resin powder, and mixing and milling for 20min to obtain a pre-pressed material;
and S7, pressing and forming the pre-pressed material by a press to obtain the finished magnesia-alumina-carbon brick.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114736007A (en) * | 2022-02-23 | 2022-07-12 | 上海利尔耐火材料有限公司 | Low-heat-conductivity high-performance aluminum-magnesia-carbon molten pool brick and preparation method thereof |
| CN117362056A (en) * | 2023-12-07 | 2024-01-09 | 山东海泰高温材料有限公司 | Preparation method and application of magnesia carbon brick for steel ladle |
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| CN104230359A (en) * | 2014-09-19 | 2014-12-24 | 上海利尔耐火材料有限公司 | Magnesia carbon brick for arc furnace lining and production method of magnesia carbon brick |
| CN106336226A (en) * | 2016-08-17 | 2017-01-18 | 浙江父子岭特种耐火有限公司 | Ladle molten-bath brick |
| CN109534798A (en) * | 2019-01-29 | 2019-03-29 | 洛阳源华冶金高温材料有限公司 | 300 tons of ladle lashed area aluminium-magnesia carbon bricks of one kind and preparation method thereof |
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2021
- 2021-06-07 CN CN202110630874.5A patent/CN113292317A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104230359A (en) * | 2014-09-19 | 2014-12-24 | 上海利尔耐火材料有限公司 | Magnesia carbon brick for arc furnace lining and production method of magnesia carbon brick |
| CN106336226A (en) * | 2016-08-17 | 2017-01-18 | 浙江父子岭特种耐火有限公司 | Ladle molten-bath brick |
| CN109534798A (en) * | 2019-01-29 | 2019-03-29 | 洛阳源华冶金高温材料有限公司 | 300 tons of ladle lashed area aluminium-magnesia carbon bricks of one kind and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114736007A (en) * | 2022-02-23 | 2022-07-12 | 上海利尔耐火材料有限公司 | Low-heat-conductivity high-performance aluminum-magnesia-carbon molten pool brick and preparation method thereof |
| CN117362056A (en) * | 2023-12-07 | 2024-01-09 | 山东海泰高温材料有限公司 | Preparation method and application of magnesia carbon brick for steel ladle |
| CN117362056B (en) * | 2023-12-07 | 2024-02-20 | 山东海泰高温材料有限公司 | Preparation method and application of magnesia carbon brick for steel ladle |
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