CN116354702A - Production method of anti-stripping unburned magnesia-calcium-carbon brick - Google Patents
Production method of anti-stripping unburned magnesia-calcium-carbon brick Download PDFInfo
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- CN116354702A CN116354702A CN202310336649.XA CN202310336649A CN116354702A CN 116354702 A CN116354702 A CN 116354702A CN 202310336649 A CN202310336649 A CN 202310336649A CN 116354702 A CN116354702 A CN 116354702A
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- 239000011449 brick Substances 0.000 title claims abstract description 67
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 82
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 71
- 239000011575 calcium Substances 0.000 claims abstract description 71
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 41
- 239000004576 sand Substances 0.000 claims abstract description 33
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000010439 graphite Substances 0.000 claims abstract description 17
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000010426 asphalt Substances 0.000 claims abstract description 14
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000005011 phenolic resin Substances 0.000 claims abstract description 13
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 13
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 12
- 239000000654 additive Substances 0.000 claims abstract description 11
- 230000000996 additive effect Effects 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000007580 dry-mixing Methods 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 25
- 238000007599 discharging Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000011265 semifinished product Substances 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000004901 spalling Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- DJOYTAUERRJRAT-UHFFFAOYSA-N 2-(n-methyl-4-nitroanilino)acetonitrile Chemical compound N#CCN(C)C1=CC=C([N+]([O-])=O)C=C1 DJOYTAUERRJRAT-UHFFFAOYSA-N 0.000 abstract description 6
- 239000006104 solid solution Substances 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000010298 pulverizing process Methods 0.000 abstract description 3
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- 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
- C04B35/0435—Refractories from grain sized mixtures containing refractory metal compounds other than chromium oxide or chrome ore
-
- 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
-
- 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
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
-
- 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
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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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
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/401—Alkaline earth metals
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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
- C04B2235/42—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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- 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
- C04B2235/70—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
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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
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention relates to the technical field of magnesia-calcium carbon bricks, and discloses a production method of an anti-peeling unburned magnesia-calcium carbon brick, which is characterized by comprising the following steps: 1) Sequentially taking 30-80 parts of magnesia-calcium sand, 15-75 parts of fused magnesia, 5-10 parts of crystalline flake graphite, 1-5 parts of zirconia micro powder, 1-5 parts of silicon carbide micro powder, 1-6 parts of modified asphalt, 2-4 parts of phenolic resin and 1-5 parts of additive metal magnesium powder; 2) And (3) dry-mixing the magnesia-calcium sand and the fused magnesia in the step (1) according to the proportioning amount. According to the production method of the anti-peeling unburned magnesia-calcium carbon brick, the zirconia micropowder is added, so that a calcium zirconate solid solution can be formed in the production process of the magnesia-calcium carbon brick, the reaction between the hot end of the magnesia-calcium carbon brick and water molecules in air can be reduced through the calcium zirconate solid solution, the peeling or pulverization times of the magnesia-calcium carbon brick are reduced, the hardness and the heat transfer capability of the magnesia-calcium carbon brick are improved through the addition of the flake graphite, and the situation that the magnesia-calcium carbon brick is broken due to overlarge temperature difference between the hot end and the cold end in the use process of the magnesia-calcium carbon brick is prevented.
Description
Technical Field
The invention relates to the technical field of magnesia-calcium carbon bricks, in particular to a production method of an anti-stripping unburned magnesia-calcium carbon brick.
Background
The magnesia-calcium-carbon brick is a refractory product prepared from dolomite sand, magnesia and scaly graphite as main raw materials, and is mainly characterized in that the magnesia-calcium-carbon brick has better corrosion resistance to low-alkalinity and low-iron slag than magnesia-carbon bricks, has excellent slag corrosion resistance, slag permeability, thermal shock resistance and thermal conductivity, but takes special attention to waterproof measures, and has good application prospects in the aspects of steelmaking converters, electric furnaces, external refining furnaces, ladles and the like in future.
The magnesia-calcium carbon brick is characterized in that the turnover is discontinuous in the use process, the hot end of the magnesia-calcium carbon brick reacts with water molecules in the air in the cold-hot alternating process of the steel ladle, so that the magnesia-calcium carbon brick is frequently peeled off or pulverized, the working layer thickness is reduced, the steel ladle furnace age is further reduced, and secondly, acid slag and alkaline slag react with the magnesia-calcium carbon brick body in the multi-steel smelting environment, so that the pouring slag surface is abnormally eroded and peeled off, and the steel ladle is taken off in advance, so that the production method of the peeling-resistant unburned magnesia-calcium carbon brick is provided to solve the problems.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a production method of an anti-stripping unburned magnesia-calcium carbon brick, which has good anti-stripping performance and solves the problem that the existing magnesia-calcium carbon brick is easy to strip or pulverize in the use process.
(II) technical scheme
In order to achieve the aim of good anti-stripping performance, the invention provides the following technical scheme: a production method of an anti-peeling unburned magnesia-calcium carbon brick comprises the following steps:
1) Sequentially taking 30-80 parts of magnesia-calcium sand, 15-75 parts of fused magnesia, 5-10 parts of crystalline flake graphite, 1-5 parts of zirconia micro powder, 1-5 parts of silicon carbide micro powder, 1-6 parts of modified asphalt, 2-4 parts of phenolic resin and 1-5 parts of additive metal magnesium powder;
2) Firstly, dry-mixing the magnesia-calcium sand and the fused magnesia in the step 1) according to the proportion, adding modified asphalt and phenolic resin for wet mixing after mixing for 2-3 minutes, adding crystalline flake graphite for mixing after mixing for 3-5 minutes, adding fused magnesia, zirconia micropowder and silicon carbide micropowder for mixing for 5-7 minutes after mixing for 2-4 minutes, finally adding additive metal magnesia powder, and discharging after mixing for 15-25 minutes;
3) Pouring the mixture prepared in the step 2) into a mould, and pressurizing to form a blank to obtain a semi-finished product;
4) And (3) performing heat treatment on the semi-finished product obtained in the step (3) by using a brick kiln, heating to 230-300 ℃, preserving heat for 10 hours, and discharging from the kiln to obtain the finished product of the magnesia-calcia-carbon brick.
Preferably, the magnesia-calcium sand comprises 10-20 parts of magnesia-calcium sand with the particle size of 4-6mm, 15-35 parts of magnesia-calcium sand with the particle size of 1-3mm and 5-25 parts of magnesia-calcium sand with the particle size of 0.05-1 mm.
Preferably, the fused magnesia comprises 5-25 parts of fused magnesia with the grain size of 5-1mm, 5-25 parts of fused magnesia with the grain size of 1-0.05mm and 5-25 parts of fused magnesia with the grain size of less than 0.5 mm.
Preferably, the mass percentage of MgO in the fused magnesia is more than or equal to 96 percent.
Preferably, the grain size of the crystalline flake graphite is 0.05-0.07mm, the grain size of the zirconia micro powder is 0.01-0.05mm, and the grain size of the silicon carbide micro powder is less than 0.01mm.
Preferably, the viscosity of the modified asphalt is 50000-60000 mPa.s, and the viscosity of the phenolic resin is 7000-10000 mPa.s.
(III) beneficial effects
Compared with the prior art, the invention provides a production method of an anti-peeling unburned magnesia-calcium-carbon brick, which has the following beneficial effects:
1. according to the production method of the anti-peeling unburned magnesia-calcium carbon brick, the zirconia micropowder is added, so that a calcium zirconate solid solution can be formed in the manufacturing process of the magnesia-calcium carbon brick, the reaction between the hot end of the magnesia-calcium carbon brick and water molecules in air can be reduced through the calcium zirconate solid solution, and the peeling or pulverization times of the magnesia-calcium carbon brick in the using process are reduced.
2. According to the production method of the anti-peeling unburned magnesia-calcium carbon brick, the hardness and the heat transfer capability of the magnesia-calcium carbon brick are improved by adding the crystalline flake graphite, and the situation that the magnesia-calcium carbon brick is broken due to overlarge temperature difference between the hot end and the cold end in the using process of the magnesia-calcium carbon brick is prevented.
Detailed Description
The technical solutions of 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 apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one: a production method of an anti-peeling unburned magnesia-calcium carbon brick comprises the following steps:
1) Sequentially taking 10 parts of magnesia-calcium sand with the grain size of 4-6mm, 15 parts of magnesia-calcium sand with the grain size of 1-3mm, 5 parts of magnesia-calcium sand with the grain size of 0.05-1mm, 5 parts of fused magnesia with the grain size of 5-1mm, 5 parts of fused magnesia with the grain size of 1-0.05mm, 5 parts of fused magnesia with the grain size of less than 0.5mm, 10 parts of crystalline flake graphite with the grain size of 0.05-0.07mm, 5 parts of zirconia micro powder with the grain size of 0.01-0.05mm, 6 parts of modified asphalt with the grain size of less than 0.01mm, 6 parts of modified asphalt with the viscosity of 50000-60000 mPa.s, 4 parts of phenolic resin with the viscosity of 7000-10000 mPa.s and 5 parts of additive metal magnesium powder.
2) Firstly, 10 parts of magnesia-calcium sand with the grain size of 4-6mm, 15 parts of magnesia-calcium sand with the grain size of 1-3mm, 5 parts of magnesia-calcium sand with the grain size of 0.05-1mm, 5 parts of fused magnesia with the grain size of 5-1mm and 5 parts of fused magnesia with the grain size of 1-0.05mm in the step 1) are dry-mixed, 6 parts of modified asphalt with the viscosity of 50000-60000 mPa.s and 4 parts of phenolic resin with the viscosity of 7000-10000 mPa.s are added for wet mixing after 2-3 minutes, 10 parts of crystalline flake graphite with the grain size of 0.05-0.07mm is added for mixing after 3-5 minutes, 5 parts of fused magnesia with the grain size of < 0.5mm, 5 parts of zirconia micropowder with the grain size of 0.01-0.05mm and 5 parts of silicon carbide micropowder with the grain size of < 0.01mm are added for 5-7 minutes, and finally 5 parts of additive metal magnesium powder is added for discharging after 15-25 minutes.
3) Pouring the mixture prepared in the step 2) into a mould, and pressurizing to obtain a blank to obtain a semi-finished product.
4) And (3) performing heat treatment on the semi-finished product obtained in the step (3) by using a brick kiln, heating to 230-300 ℃, preserving heat for 10 hours, and discharging from the kiln to obtain the finished product of the magnesia-calcia-carbon brick.
The magnesia-calcium carbon brick produced according to the formula has lower manufacturing cost and less required raw materials, but the volume density, the compressive strength and the high-temperature conductivity of the existing magnesia-calcium carbon brick are increased.
Embodiment two: a production method of an anti-peeling unburned magnesia-calcium carbon brick comprises the following steps:
1) 15 parts of magnesia-calcium sand with the grain size of 4-6mm, 25 parts of magnesia-calcium sand with the grain size of 1-3mm, 15 parts of magnesia-calcium sand with the grain size of 0.05-1mm, 15 parts of fused magnesia with the grain size of 5-1mm, 15 parts of fused magnesia with the grain size of 1-0.05mm, 15 parts of fused magnesia with the grain size of less than 0.5mm, 7 parts of crystalline flake graphite with the grain size of 0.05-0.07mm, 3 parts of zirconia micro powder with the grain size of 0.01-0.05mm, 3 parts of silicon carbide micro powder with the grain size of less than 0.01mm, 4 parts of modified asphalt with the viscosity of 50000-60000 mPa.s, 3 parts of phenolic resin with the viscosity of 7000-10000 mPa.s and 3 parts of additive metal magnesium powder are sequentially taken.
2) Firstly, 15 parts of magnesium-calcium sand with the particle size of 4-6mm, 25 parts of magnesium-calcium sand with the particle size of 1-3mm, 15 parts of magnesium-calcium sand with the particle size of 0.05-1mm, 15 parts of fused magnesia with the particle size of 5-1mm and 15 parts of fused magnesia with the particle size of 1-0.05mm in the step 1) are dry mixed, 4 parts of modified asphalt with the viscosity of 50000-60000 mPa.s and 3 parts of phenolic resin with the viscosity of 7000-10000 mPa.s are added for wet mixing after 2-3 minutes, 7 parts of crystalline flake graphite with the particle size of 0.05-0.07mm are added for mixing after 3-5 minutes, 3 parts of fused magnesia with the particle size of less than 0.5mm, 3 parts of zirconia micropowder with the particle size of 0.01-0.05mm and 3 parts of silicon carbide micropowder with the particle size of less than 0.01mm are added for 5-7 minutes, and finally 3 parts of additive metal magnesium powder is added for mixing, and discharging after 15-25 minutes.
3) Pouring the mixture prepared in the step 2) into a mould, and pressurizing to obtain a blank to obtain a semi-finished product.
4) And (3) performing heat treatment on the semi-finished product obtained in the step (3) by using a brick kiln, heating to 230-300 ℃, preserving heat for 10 hours, and discharging from the kiln to obtain the finished product of the magnesia-calcia-carbon brick.
The magnesia-calcium carbon brick produced according to the formula has moderate manufacturing cost and moderate required raw materials, but the volume density, compressive strength and high-temperature conductivity of the produced magnesia-calcium carbon brick are improved to a part compared with those of the magnesia-calcium carbon brick produced in the first embodiment.
Embodiment III: a production method of an anti-peeling unburned magnesia-calcium carbon brick comprises the following steps:
1) Sequentially taking 20 parts of magnesia-calcium sand with the grain size of 4-6mm, 35 parts of magnesia-calcium sand with the grain size of 1-3mm, 25 parts of magnesia-calcium sand with the grain size of 0.05-1mm, 25 parts of fused magnesia with the grain size of 5-1mm, 25 parts of fused magnesia with the grain size of 1-0.05mm, 25 parts of fused magnesia with the grain size of less than 0.5mm, 5 parts of crystalline flake graphite with the grain size of 0.05-0.07mm, 1 part of zirconia micro powder with the grain size of 0.01-0.05mm, 1 part of silicon carbide micro powder with the grain size of less than 0.01mm, 1 part of modified asphalt with the viscosity of 50000-60000 mPa.s, 2 parts of phenolic resin with the viscosity of 7000-10000 mPa.s and 1 part of additive metal magnesium powder.
2) Firstly, mixing 20 parts of magnesium-calcium sand with the particle size of 4-6mm, 35 parts of magnesium-calcium sand with the particle size of 1-3mm, 25 parts of magnesium-calcium sand with the particle size of 0.05-1mm, 25 parts of fused magnesia with the particle size of 5-1mm and 25 parts of fused magnesia with the particle size of 1-0.05mm in dry mode, adding 1 part of modified asphalt with the viscosity of 50000-60000 mPa.s and 2 parts of phenolic resin with the viscosity of 7000-10000 mPa.s for wet mixing after mixing for 2-3 minutes, adding 5 parts of crystalline flake graphite with the particle size of 0.05-0.07mm for mixing after mixing for 3-5 minutes, adding 1 part of fused magnesia with the particle size of less than 0.5mm, 1 part of zirconia micropowder with the particle size of 0.01-0.05mm and 1 part of silicon carbide micropowder with the particle size of less than 0.01mm for 5-7 minutes, and finally adding 1 part of additive metal magnesium powder for mixing for 15-25 minutes, and discharging.
3) Pouring the mixture prepared in the step 2) into a mould, and pressurizing to obtain a blank to obtain a semi-finished product.
4) And (3) performing heat treatment on the semi-finished product obtained in the step (3) by using a brick kiln, heating to 230-300 ℃, preserving heat for 10 hours, and discharging from the kiln to obtain the finished product of the magnesia-calcia-carbon brick.
The magnesia-calcium carbon bricks produced according to the formula have higher manufacturing cost and more needed raw materials, but the volume density, compressive strength and high-temperature conductivity of the produced magnesia-calcium carbon bricks are greatly improved compared with those of the magnesia-calcium carbon bricks produced in the first embodiment and the second embodiment.
The beneficial effects of the invention are as follows: according to the production method of the anti-peeling unburned magnesia-calcium carbon brick, the zirconia micropowder is added, so that a calcium zirconate solid solution can be formed in the production process of the magnesia-calcium carbon brick, the reaction between the hot end of the magnesia-calcium carbon brick and water molecules in air can be reduced through the calcium zirconate solid solution, the peeling or pulverization times of the magnesia-calcium carbon brick in the use process are reduced, and the scale graphite is added, so that the hardness and the heat transfer capability of the magnesia-calcium carbon brick are improved, and the situation that the magnesia-calcium carbon brick is broken due to overlarge temperature difference between the hot end and the cold end in the use process of the magnesia-calcium carbon brick is prevented.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The production method of the anti-peeling unburned magnesia-calcium-carbon brick is characterized by comprising the following steps of:
1) Sequentially taking 30-80 parts of magnesia-calcium sand, 15-75 parts of fused magnesia, 5-10 parts of crystalline flake graphite, 1-5 parts of zirconia micro powder, 1-5 parts of silicon carbide micro powder, 1-6 parts of modified asphalt, 2-4 parts of phenolic resin and 1-5 parts of additive metal magnesium powder;
2) Firstly, dry-mixing the magnesia-calcium sand and the fused magnesia in the step 1) according to the proportion, adding modified asphalt and phenolic resin for wet mixing after mixing for 2-3 minutes, adding crystalline flake graphite for mixing after mixing for 3-5 minutes, adding fused magnesia, zirconia micropowder and silicon carbide micropowder for mixing for 5-7 minutes after mixing for 2-4 minutes, finally adding additive metal magnesia powder, and discharging after mixing for 15-25 minutes;
3) Pouring the mixture prepared in the step 2) into a mould, and pressurizing to form a blank to obtain a semi-finished product;
4) And (3) performing heat treatment on the semi-finished product obtained in the step (3) by using a brick kiln, heating to 230-300 ℃, preserving heat for 10 hours, and discharging from the kiln to obtain the finished product of the magnesia-calcia-carbon brick.
2. The method for producing an anti-peeling unburned magnesia-calcium-carbon brick according to claim 1, wherein the magnesia-calcium sand comprises 10-20 parts of magnesia-calcium sand with the particle size of 4-6mm, 15-35 parts of magnesia-calcium sand with the particle size of 1-3mm and 5-25 parts of magnesia-calcium sand with the particle size of 0.05-1 mm.
3. The method for producing an anti-spalling unburned magnesia-calcia-carbon brick according to claim 1, wherein the fused magnesia comprises 5-25 parts of fused magnesia with the grain size of 5-1mm, 5-25 parts of fused magnesia with the grain size of 1-0.05mm and 5-25 parts of fused magnesia with the grain size of less than 0.5 mm.
4. The production method of the anti-peeling unburned magnesia-calcium-carbon brick according to claim 1, wherein the mass percentage of MgO in the fused magnesia is more than or equal to 96%.
5. The method for producing an anti-peeling unburned magnesia-calcium-carbon brick according to claim 1, wherein the particle size of the crystalline flake graphite is 0.05-0.07mm, the particle size of the zirconia micropowder is 0.01-0.05mm, and the particle size of the silicon carbide micropowder is less than 0.01mm.
6. The method for producing an anti-peeling unburned magnesia-calcia-carbon brick according to claim 1, wherein the viscosity of the modified asphalt is 50000-60000 mPa-s, and the viscosity of the phenolic resin is 7000-10000 mPa-s.
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| CN113354426A (en) * | 2021-07-06 | 2021-09-07 | 山西禄纬堡太钢耐火材料有限公司 | Baking-free magnesia-calcium-carbon brick and preparation method thereof |
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- 2023-03-31 CN CN202310336649.XA patent/CN116354702A/en active Pending
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| JPH05330904A (en) * | 1992-06-03 | 1993-12-14 | Kyushu Refract Co Ltd | Highly spalling-resistant magnesia carbon brick |
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| CN104829252A (en) * | 2015-04-24 | 2015-08-12 | 沈阳化工大学 | Calcium oxide carbon brick and preparation method thereof |
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