CN113354426A - Baking-free magnesia-calcium-carbon brick and preparation method thereof - Google Patents
Baking-free magnesia-calcium-carbon brick and preparation method thereof Download PDFInfo
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- CN113354426A CN113354426A CN202110762873.6A CN202110762873A CN113354426A CN 113354426 A CN113354426 A CN 113354426A CN 202110762873 A CN202110762873 A CN 202110762873A CN 113354426 A CN113354426 A CN 113354426A
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- 239000011449 brick Substances 0.000 title claims abstract description 52
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 39
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 37
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 37
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 37
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 37
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000011575 calcium Substances 0.000 claims abstract description 33
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 33
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000010426 asphalt Substances 0.000 claims abstract description 22
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 21
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000010439 graphite Substances 0.000 claims abstract description 18
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 18
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 17
- 239000005011 phenolic resin Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000007598 dipping method Methods 0.000 claims abstract description 6
- 238000004806 packaging method and process Methods 0.000 claims abstract description 6
- 239000012188 paraffin wax Substances 0.000 claims abstract description 6
- 239000004033 plastic Substances 0.000 claims abstract description 6
- 238000005303 weighing Methods 0.000 claims abstract description 6
- 238000007580 dry-mixing Methods 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 35
- 238000003756 stirring Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 10
- 239000011265 semifinished product Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 5
- QLJOWVRCWDQCBG-UHFFFAOYSA-N [C].[Mg].[Ca] Chemical compound [C].[Mg].[Ca] QLJOWVRCWDQCBG-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 230000036571 hydration Effects 0.000 abstract description 4
- 238000006703 hydration reaction Methods 0.000 abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 4
- 239000010935 stainless steel Substances 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 3
- 235000012245 magnesium oxide Nutrition 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000000292 calcium oxide Substances 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 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 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052599 brucite Inorganic materials 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000012671 ceramic insulating material Substances 0.000 description 1
- 239000011335 coal coke Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000003605 opacifier Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002023 wood Substances 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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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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
- C04B2235/02—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
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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
- C04B2235/3826—Silicon carbides
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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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
- C04B2235/42—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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- 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
- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
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- 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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- C04B2235/54—Particle size related information
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- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
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- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
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Abstract
The invention discloses a baking-free magnesia-calcium-carbon brick which comprises the following raw materials in parts by weight: 60-100 parts of calcium magnesite, 20-40 parts of fused magnesia, 5-10 parts of crystalline flake graphite, 3-8 parts of zirconia micro powder, 3-8 parts of silicon carbide micro powder, 2-5 parts of phenolic resin and 2-5 parts of modified asphalt; the preparation method comprises the following steps: (1) weighing the raw materials; (2) firstly, dry-mixing the calcium magnesite, the fused magnesite and the zirconia micro powder, then adding the phenolic resin and the modified asphalt for wet mixing, then adding the crystalline flake graphite mixed material, and finally adding the silicon carbide micro powder mixed material; (3) pouring into a mould, pressurizing to form a blank, and baking; (4) dipping in paraffin, and packaging with double-layer plastic package. The non-fired magnesia-calcium-carbon brick prepared by the invention has the advantages of large volume density, high strength, difficult hydration and cracking, strong anti-erosion capability, good high-temperature stability, difficult peeling phenomenon in use and long service life, and can be suitable for ladles of high-grade steel such as stainless steel, special steel and the like.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a baking-free magnesia-calcium-carbon brick and a preparation method thereof.
Background
The non-fired magnesia-calcium-carbon brick is an alkaline refractory material which is prepared by using MgO, CaO and C as main components through high-pressure pressing, electric heating and drying, and has excellent slag erosion resistance, slag permeability, thermal shock stability and thermal conductivity.
At present, the baking-free magnesia-calcium-carbon brick is widely applied to stainless steel refining VOD furnaces, AOD furnaces and LF furnaces, has wide market prospect, and plays a great role in promoting the technical progress of steel enterprises in China. However, the erosion of the baking-free magnesia-calcium-carbon brick for the AOD furnace is mainly the dissolution and permeation of a silicate liquid phase, and the baking-free magnesia-calcium-carbon brick for the VOD ladle bears the erosion of a plurality of chemical media and mechanical acting force in the using process, so that the brick body is cracked and deformed until the brick body falls off; meanwhile, due to the characteristic that the magnesium-calcium refractory material is easy to hydrate, the magnesium-calcium refractory material becomes an important problem for popularization.
Therefore, the problem to be solved by the skilled in the art is how to provide a baking-free magnesia-calcium-carbon brick which has stable chemical properties, excellent mechanical properties and is not easy to hydrate.
Disclosure of Invention
In view of the above, the present invention aims to provide a baking-free magnesia-calcium-carbon brick and a preparation method thereof, so as to solve the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a baking-free magnesia-calcium-carbon brick comprises the following raw materials in parts by weight: 60-100 parts of calcium magnesite, 20-40 parts of fused magnesia, 5-10 parts of crystalline flake graphite, 3-8 parts of zirconia micro powder, 3-8 parts of silicon carbide micro powder, 2-5 parts of phenolic resin and 2-5 parts of modified asphalt;
preferably: 80 parts of calcium magnesite, 30 parts of fused magnesite, 8 parts of crystalline flake graphite, 5 parts of zirconia micro powder, 5 parts of silicon carbide micro powder, 3 parts of phenolic resin and 3 parts of modified asphalt.
In the invention, the magnesia-calcium sand (killed high-calcium magnesium-site) is a magnesia-calcium refractory raw material, also called high-calcium magnesia sand, and is used for manufacturing magnesia-calcium bricks. With the increase of the calcining temperature, the carbon can be made to be C4AF is distributed among periclase crystal grains and gradually gathered to gaps of the included angles of the periclase crystal grains, so that the high-temperature strength of the brick is improved.
The electrically fused magnesite is an alkaline refractory raw material obtained by electrically fusing magnesite, brucite or magnesium hydroxide extracted from seawater, has high purity, strong hydration resistance, large crystal grains, compact structure, strong slag resistance and good thermal shock stability, and is an excellent high-temperature electrical insulating material.
The flake graphite is natural crystalloid graphite which is shaped like fish phosphorus, belongs to a hexagonal system, is in a layered structure and has good performances of high temperature resistance, electric conduction, heat conduction, lubrication, plasticity, acid and alkali resistance and the like.
The zirconia micropowder is inactive in chemical property, has the properties of high melting point, high resistivity, high refractive index and low thermal expansion coefficient, and becomes an important high-temperature resistant material, a ceramic insulating material and a ceramic opacifier, and is also a main raw material of artificial drills. According to the invention, the zirconium oxide micro powder is added, so that the zirconium oxide micro powder can react with free calcium oxide with high activity at high temperature to form calcium zirconate solid solution, calcium zirconate generated in situ surrounds calcium oxide, the contact probability of water vapor and calcium oxide is reduced, the hot end of the magnesia-calcium-carbon brick is prevented from reacting with water vapor in the air in the process of transporting the steel ladle, and the stripping times of the magnesia-calcium-carbon brick in the process of using the steel ladle are reduced.
The silicon carbide micro powder is prepared by smelting quartz sand, petroleum coke (or coal coke), wood dust (salt is required when green silicon carbide is produced) and other raw materials in a resistance furnace at high temperature, and has the characteristics of corrosion resistance, high temperature resistance, high strength, good heat-conducting property, impact resistance and the like.
The phenolic resin has good acid resistance, mechanical property and heat resistance, and can maintain the structural integrity and dimensional stability even at very high temperature.
The modified asphalt is an asphalt binder prepared by adding external additives (modifiers) such as rubber, resin, high molecular polymer, ground rubber powder or other fillers or by adopting measures such as mild oxidation processing of the asphalt, so that the performance of the asphalt or the asphalt mixture is improved, and the asphalt binder has strong adhesion and low price.
Further, the magnesia-calcium sand comprises 10-20 parts of magnesia-calcium sand with the grain diameter of 4-7mm, 30-50 parts of magnesia-calcium sand with the grain diameter of 1-4mm and 20-30 parts of magnesia-calcium sand with the grain diameter less than 1 mm.
Further, the fused magnesite comprises 10-20 parts of fused magnesite with the grain size of 0.5-5mm and 10-20 parts of fused magnesite with the grain size less than 0.5 mm.
Further, the particle size of the flake graphite is 0.06-0.08 mm.
Further, the particle size of the zirconia fine powder is 0.03 to 0.05 mm.
Further, the particle diameter of the silicon carbide fine powder is 0.005 to 0.01 mm.
Further, the viscosity of the phenolic resin is 8000-10000 mPa.s; the viscosity of the modified asphalt is 40000-50000 mPas.
A preparation method of a baking-free magnesia-calcium-carbon brick specifically comprises the following steps:
(1) weighing the raw materials in parts by weight of the baking-free magnesia-calcium-carbon brick;
(2) firstly, dry-mixing the calcium magnesite, the fused magnesite and the zirconia micro powder, then adding the phenolic resin and the modified asphalt for wet mixing, then adding the crystalline flake graphite mixed material, and finally adding the silicon carbide micro powder mixed material to obtain a mixture;
(3) pouring the mixture into a mold, pressurizing to form a blank, and baking to obtain a semi-finished product;
(4) and (5) dipping a layer of paraffin on the surface of the semi-finished product, and packaging by adopting double-layer plastic package to obtain the finished product of the baking-free magnesia-calcium-carbon brick.
Further, in the step (2), the stirring speed of dry mixing is 150-; the stirring speed of the wet mixing is 200-250r/min, and the time is 2-3 min; the mixing speed of the mixed materials is 250-300r/min, and the time is 2-4 min.
Further, in the step (3), the baking temperature is 230-.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the non-fired magnesia-calcium-carbon brick prepared by reasonable ingredients and scientific treatment process has the advantages of large volume density, high strength, difficult hydration and cracking, strong anti-erosion capability, good high-temperature stability, difficult peeling phenomenon in use and long service life, and can be suitable for ladles of high-grade steel such as stainless steel, special steel and the like.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following examples of the present invention,
example 1
The baking-free magnesia-calcium-carbon brick comprises the following raw materials by weight: 10kg of calcium magnesite with the particle size of 4-7mm, 30kg of calcium magnesite with the particle size of 1-4mm, 20kg of calcium magnesite with the particle size of less than 1mm, 10kg of electric fused magnesia with the particle size of 0.5-5mm, 10kg of electric fused magnesia with the particle size of less than 0.5mm, 5kg of crystalline flake graphite with the particle size of 0.06-0.08mm, 8kg of zirconia micro powder with the particle size of 0.03-0.05mm, 8kg of silicon carbide micro powder with the particle size of 0.005-0.01mm, 5kg of phenolic resin with the viscosity of 8000 mPa.s and 5kg of modified asphalt with the viscosity of 40000 mPa.s;
the preparation method of the baking-free magnesia-calcium-carbon brick specifically comprises the following steps:
(1) weighing the raw materials according to the weight of the baking-free magnesia-calcium-carbon brick;
(2) firstly, mixing the calcium magnesite, the fused magnesite and the silicon carbide micro powder in a dry way for 3min at a stirring speed of 150r/min, then adding the phenolic resin and the modified asphalt to wet-mix for 3min at a stirring speed of 200r/min, then adding the crystalline flake graphite to mix for 4min at a stirring speed of 250r/min, and finally adding the silicon carbide micro powder to mix for 4min at a stirring speed of 250r/min to obtain a mixture;
(3) pouring the mixture into a mold, pressurizing to form a blank, and baking for 10 hours in a drying kiln at the temperature of 230 ℃ to obtain a semi-finished product;
(4) and (5) dipping a layer of paraffin on the surface of the semi-finished product, and packaging by adopting double-layer plastic package to obtain the finished product of the baking-free magnesia-calcium-carbon brick.
Example 2
The baking-free magnesia-calcium-carbon brick comprises the following raw materials by weight: 15kg of calcium magnesite with the particle size of 4-7mm, 40kg of calcium magnesite with the particle size of 1-4mm, 25kg of calcium magnesite with the particle size of less than 1mm, 15kg of electric melting magnesite with the particle size of 0.5-5mm, 15kg of electric melting magnesite with the particle size of less than 0.5mm, 8kg of crystalline flake graphite with the particle size of 0.06-0.08mm, 5kg of zirconia micro powder with the particle size of 0.03-0.05mm, 5kg of silicon carbide micro powder with the particle size of 0.005-0.01mm, 3kg of phenolic resin with the viscosity of 9000mPa s and 3kg of modified asphalt with the viscosity of 45000mPa s;
the preparation method of the baking-free magnesia-calcium-carbon brick specifically comprises the following steps:
(1) weighing the raw materials according to the weight of the baking-free magnesia-calcium-carbon brick;
(2) firstly, mixing the calcium magnesite, the fused magnesite, the zirconia micro powder and the silicon carbide micro powder in a dry way for 2min at a stirring speed of 180r/min, then adding phenolic resin and modified asphalt to wet-mix for 3min at a stirring speed of 220r/min, then adding the crystalline flake graphite to mix for 3min at a stirring speed of 280r/min, and finally adding the silicon carbide micro powder to mix for 3min at a stirring speed of 280r/min to obtain a mixture;
(3) pouring the mixture into a mold, pressurizing to form a blank, and baking for 8 hours in a drying kiln at the temperature of 250 ℃ to obtain a semi-finished product;
(4) and (5) dipping a layer of paraffin on the surface of the semi-finished product, and packaging by adopting double-layer plastic package to obtain the finished product of the baking-free magnesia-calcium-carbon brick.
Example 3
The baking-free magnesia-calcium-carbon brick comprises the following raw materials by weight: 20kg of calcium magnesite with the particle size of 4-7mm, 50kg of calcium magnesite with the particle size of 1-4mm, 30kg of calcium magnesite with the particle size of less than 1mm, 20kg of electric melting magnesite with the particle size of 0.5-5mm, 20kg of electric melting magnesite with the particle size of less than 0.5mm, 10kg of crystalline flake graphite with the particle size of 0.06-0.08mm, 3kg of zirconia micro powder with the particle size of 0.03-0.05mm, 3kg of silicon carbide micro powder with the particle size of 0.005-0.01mm, 2kg of phenolic resin with the viscosity of 10000 mPa.s and 2kg of modified asphalt with the viscosity of 50000 mPa.s;
the preparation method of the baking-free magnesia-calcium-carbon brick specifically comprises the following steps:
(1) weighing the raw materials according to the weight of the baking-free magnesia-calcium-carbon brick;
(2) firstly, mixing the calcium magnesite, the fused magnesite, the zirconia micro powder and the silicon carbide micro powder in a dry way for 1min at a stirring speed of 200r/min, then adding the phenolic resin and the modified asphalt to wet-mix for 2min at a stirring speed of 250r/min, then adding the crystalline flake graphite to mix for 2min at a stirring speed of 300r/min, and finally adding the silicon carbide micro powder to mix for 2min at a stirring speed of 300r/min to obtain a mixture;
(3) pouring the mixture into a mold, pressurizing to form a blank, and baking for 7 hours in a drying kiln at the temperature of 260 ℃ to obtain a semi-finished product;
(4) and (5) dipping a layer of paraffin on the surface of the semi-finished product, and packaging by adopting double-layer plastic package to obtain the finished product of the baking-free magnesia-calcium-carbon brick.
Comparative example
The baking-free magnesia-calcium-carbon brick is only different from the brick in the example 2 in that zirconia micro powder and silicon carbide micro powder are not contained.
Performance testing
The unburned magnesium calcium carbon bricks prepared in the examples 1 to 3 and the comparative example are respectively taken and tested for MgO content, CaO content, C content, compressive strength, apparent porosity, volume density and high-temperature rupture strength.
The results are shown in Table 1.
TABLE 1 EXAMPLES 1-3 AND COMPARATIVE EXAMPLE No-BURNING MAGNESIUM CALCIUM CARBON BRICK PERFORMANCE TEST RESULTS
| Test items | Example 1 | Example 2 | Example 3 | Comparative example |
| MgO content/%) | 56.4 | 58.9 | 60.2 | 59.3 |
| CaO content/%) | 30.2 | 31.6 | 32.8 | 32.2 |
| Content of C/%) | 4.3 | 4.5 | 5.1 | 4.8 |
| Compressive strength/MPa | 64.5 | 65.8 | 65.2 | 37.5 |
| Apparent porosity/% | 2.8 | 2.5 | 2.6 | 4.8 |
| Bulk density/g.cm-3 | 2.98 | 3.03 | 3.01 | 2.90 |
| High temperature flexural strength/MPa | 8.2 | 8.8 | 8.5 | 5.0 |
As can be seen from Table 1, the compression strength, apparent porosity, bulk density and high temperature rupture strength of the unburned MgO-Ca-C bricks prepared in examples 1-3 of the present invention are significantly improved as compared with the comparative examples.
The tests show that the baking-free magnesia-calcium-carbon brick prepared by reasonable ingredients and scientific treatment process has the advantages of large volume density, high strength, difficult hydration and cracking, strong anti-erosion capability, good high-temperature stability, difficult peeling phenomenon in use and long service life, and can be suitable for ladles of high-grade steel such as stainless steel, special steel and the like.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The baking-free magnesia-calcium-carbon brick is characterized by comprising the following raw materials in parts by weight: 60-100 parts of calcium magnesite, 20-40 parts of fused magnesia, 5-10 parts of crystalline flake graphite, 3-8 parts of zirconia micro powder, 3-8 parts of silicon carbide micro powder, 2-5 parts of phenolic resin and 2-5 parts of modified asphalt.
2. The baking-free magnesia-calcium-carbon brick according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 80 parts of calcium magnesite, 30 parts of fused magnesite, 8 parts of crystalline flake graphite, 5 parts of zirconia micro powder, 5 parts of silicon carbide micro powder, 3 parts of phenolic resin and 3 parts of modified asphalt.
3. The baking-free magnesia-calcium-carbon brick according to claim 1 or 2, wherein the magnesia-calcium sand comprises 10 to 20 parts of magnesia-calcium sand with a particle size of 4 to 7mm, 30 to 50 parts of magnesia-calcium sand with a particle size of 1 to 4mm and 20 to 30 parts of magnesia-calcium sand with a particle size of less than 1 mm.
4. The baking-free magnesia-calcium-carbon brick according to claim 1 or 2, wherein the fused magnesia comprises 10 to 20 parts of fused magnesia with a particle size of 0.5 to 5mm and 10 to 20 parts of fused magnesia with a particle size of less than 0.5 mm.
5. The unburned magnesium calcium carbon brick according to claim 1 or 2, wherein the particle size of the crystalline flake graphite is 0.06-0.08 mm.
6. The baking-free magnesia-calcium-carbon brick according to claim 1 or 2, wherein the particle size of the zirconia micro powder is 0.03-0.05 mm.
7. The baking-free magnesia-calcium-carbon brick according to claim 1 or 2, wherein the particle size of the silicon carbide micro powder is 0.005-0.01 mm.
8. The unburned magnesia-calcium-carbon brick according to claim 1 or 2, wherein the viscosity of the phenolic resin is 8000-10000 mPa-s; the viscosity of the modified asphalt is 40000-50000 mPas.
9. The preparation method of the baking-free magnesia-calcium-carbon brick is characterized by comprising the following steps:
(1) weighing the raw materials in parts by weight of the baking-free magnesia-calcium-carbon brick as defined in any one of claims 1 to 8;
(2) firstly, dry-mixing the calcium magnesite, the fused magnesite and the zirconia micro powder, then adding the phenolic resin and the modified asphalt for wet mixing, then adding the crystalline flake graphite mixed material, and finally adding the silicon carbide micro powder mixed material to obtain a mixture;
(3) pouring the mixture into a mold, pressurizing to form a blank, and baking to obtain a semi-finished product;
(4) and (3) dipping a layer of paraffin on the surface of the semi-finished product, and packaging by adopting double-layer plastic package to obtain the finished product of the baking-free magnesia-calcium-carbon brick.
10. The method for preparing unburned magnesia-calcium-carbon brick according to claim 9, wherein in the step (2), the dry-blending stirring speed is 150-; the stirring speed of the wet mixing is 200-250r/min, and the time is 2-3 min; the mixing speed of the mixed materials is 250-300r/min, and the time is 2-4 min;
in the step (3), the baking temperature is 230-260 ℃, and the baking time is 7-10 h.
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