CN111718187A - Pouring material containing nano carbon for blast furnace tapping channel and preparation method thereof - Google Patents
Pouring material containing nano carbon for blast furnace tapping channel and preparation method thereof Download PDFInfo
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- CN111718187A CN111718187A CN202010556171.8A CN202010556171A CN111718187A CN 111718187 A CN111718187 A CN 111718187A CN 202010556171 A CN202010556171 A CN 202010556171A CN 111718187 A CN111718187 A CN 111718187A
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- 229910021392 nanocarbon Inorganic materials 0.000 title claims abstract description 123
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 43
- 239000000463 material Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title abstract description 22
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 78
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000010431 corundum Substances 0.000 claims abstract description 68
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 42
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 25
- 239000004917 carbon fiber Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 24
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 18
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 12
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims abstract description 11
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 10
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 10
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000004568 cement Substances 0.000 claims abstract description 6
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 6
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005229 chemical vapour deposition Methods 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 11
- 239000002120 nanofilm Substances 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 5
- 230000000996 additive effect Effects 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract description 17
- 239000002245 particle Substances 0.000 abstract description 13
- 239000010426 asphalt Substances 0.000 abstract description 12
- 230000003628 erosive effect Effects 0.000 abstract description 10
- 239000006185 dispersion Substances 0.000 abstract description 8
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 238000004227 thermal cracking Methods 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 61
- 229910052742 iron Inorganic materials 0.000 description 31
- 238000000034 method Methods 0.000 description 20
- 230000008569 process Effects 0.000 description 13
- 239000002893 slag Substances 0.000 description 11
- 239000011819 refractory material Substances 0.000 description 7
- 239000010419 fine particle Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007888 film coating Substances 0.000 description 3
- 238000009501 film coating Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910003481 amorphous carbon Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 239000011863 silicon-based powder Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- OCKGFTQIICXDQW-ZEQRLZLVSA-N 5-[(1r)-1-hydroxy-2-[4-[(2r)-2-hydroxy-2-(4-methyl-1-oxo-3h-2-benzofuran-5-yl)ethyl]piperazin-1-yl]ethyl]-4-methyl-3h-2-benzofuran-1-one Chemical compound C1=C2C(=O)OCC2=C(C)C([C@@H](O)CN2CCN(CC2)C[C@H](O)C2=CC=C3C(=O)OCC3=C2C)=C1 OCKGFTQIICXDQW-ZEQRLZLVSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000011858 nanopowder Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- 238000003756 stirring Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
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- 238000004804 winding Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
- C04B35/10—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 aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
-
- 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
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- 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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
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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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- 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
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Abstract
The invention discloses a casting material containing nano carbon for blast furnace tapping channel, which is prepared from super high-alumina clinker, brown corundum, white corundum 5-10%, compact corundum with granularity of 1-0.15mm and 325 meshes, silicon carbide, silicon oxide micropowder, α -Al2O3The high-performance composite material comprises micro powder, pure calcium aluminate cement, dispersible nano carbon powder, an antioxidant, chopped carbon fiber, polyvinyl alcohol explosion-proof fiber and a water reducing agent, wherein the dense corundum with the particle size of 325 meshes is a nano carbon film and comprises dense corundum. The invention also discloses a preparation method of the castable. The invention improves the carbon residue rate of the carbon source, avoids the thermal cracking holes and baking cracking pollution of the spherical asphalt, improves the uniform dispersion condition of the nano carbon in the castable and the contact probability and contact area of the nano carbon and refractory raw materials of the castable, homogenizes the distribution of the nano carbon in the castable, and strengthens the erosion resistance, high temperature resistance and thermal shock resistance of the nano carbon by coating the 325-mesh fine powder compact corundum with the nano carbon film and replacing the spherical asphalt with the dispersible nano carbon.
Description
Technical Field
The invention belongs to the technical field of refractory castable for blast furnace ironmaking, and particularly relates to a castable containing nano-carbon for a blast furnace tapping channel and a preparation method thereof.
Background
The blast furnace tapping channel is a channel for guiding high-temperature molten iron and molten slag to flow in the tapping process of the blast furnace, so that the lining of the blast furnace tapping channel is in direct contact with the high-temperature molten iron and the molten slag in the actual production process, and bears the scouring, abrasion and chemical erosion of the flowing molten iron and the molten slag and the rapid cooling and rapid heating caused by frequent alternative tapping, thereby causing the scouring abrasion, erosion melting loss, stress cracks, infiltration and structural damage of the molten iron and the molten slag on the surface layer of the refractory material. Therefore, strict technical requirements are provided for the high-temperature mechanical strength, the chemical erosion resistance and the thermal shock resistance of the refractory material for the blast furnace tapping channel.
With the continuous development of blast furnace smelting technology, the blast furnace is developed in the direction of large scale, high efficiency, automation and long service life, the single tapping quantity and the tapping flow speed are increased, the tapping time is prolonged, and the tapping temperature is increased, so that the operating condition of the iron runner is further worsened, and the damage process of the refractory material of the iron runner and the difficulty of prolonging the service life of the refractory material of the iron runner are aggravated. At present, Al is generally adopted as the refractory material of the blast furnace tapping channel2O3The main raw material of the-SiC-C castable is high-purity corundum, and the main carbon source is spherical asphalt; although the main raw materials provide excellent high-temperature performance and corrosion resistance for the castable, the high-purity corundum material has high price, which is not beneficial to the cost reduction of the castable, and meanwhile, the high-purity corundum sintering temperature is high, which is not beneficial to the formation of ceramic bonding and the improvement of thermal shock stability under the working condition of the use of the castable; in addition, the spherical asphalt can release toxic smog in the baking process to form yellow smoke, thereby causing environmental pollution; the residual carbon content after thermal cracking is low, the holes are large, the oxidation resistance is poor, and the carbon is pouredIn the process of injecting and baking, the spherical asphalt is softened and permeated, so that the through hole of the pouring material is blocked, baking water vapor is difficult to discharge, and the pouring body is easy to crack. Conventional Al is caused due to the above-mentioned disadvantages of the spherical asphalt2O3The thermal shock stability of the-SiC-C iron runner castable is reduced, the infiltration and erosion resistance of molten iron and molten slag is reduced, the service life and the iron flux of an iron runner are finally influenced, and the consumption cost of refractory materials of the iron runner is increased. In order to overcome the defects, domestic and foreign scholars develop a great deal of research work in the aspects of raw material composition, castable matrix structure improvement, efficient antioxidants, high-quality carbon sources and the like, and although part of research results obtain better application effects in actual production, the research results still have larger development space. Such as: chinese patent' an Al2O3The preparation method (CN103011868A) discloses a method for improving the matrix structure of an iron runner castable by adding a catalyst, and carbon whiskers are generated in situ through the high-temperature catalysis of the catalyst, so that the thermal shock stability and the high-temperature mechanical property of the iron runner are improved, and the comprehensive use performance and the service life of the iron runner castable are improved by utilizing the advantages of high strength, high elastic modulus, strong high-temperature corrosion resistance and the like of the carbon whiskers, but the main defects of the method are that the generation amount of the carbon whiskers is limited, the catalyst is expensive, and the method is not beneficial to realizing industrial production. Chinese patent "a castable for a blast furnace tapping runner containing carbon fibers and a preparation method thereof (CN 104072177A)" discloses an iron runner castable with a carbon fiber addition amount of 0.2-0.6 wt% and a preparation method thereof, and a main carbon source is still spherical asphalt, wherein the carbon fibers are carbon fiber monofilaments prepared by a fiber opening process, and TiO is performed in an inert atmosphere2Sol dipping modification; therefore, the preparation process of the castable is complex, and a specific method for uniformly dispersing carbon fibers is not provided. The Chinese patent ' improved refractory castable for blast furnace tapping runners ' (CN1260372C) ' discloses a refractory runner castable with main aggregate consisting of compact fused corundum, sintered tabular corundum and fused brown corundum, and improves the thermal shock stability of the castable and reduces thermal shock cracks and peeling damages of the castable through the complementary coordination action of the three corundum, but other components are not fully disclosed, and the refractory castable is not fully disclosedThe performance index condition is not beneficial to the large-scale popularization of the technology. In addition, some patent technologies use modified nano carbon powder as a carbon source, such as: chinese patents 'zirconium toughening main iron runner castable (CN 102559971A)' and 'a main iron runner castable (CN 102101783B)' respectively disclose iron runner castables using modified nano carbon powder as a carbon source, wherein the modified nano carbon powder is carbon powder with an oxide nano film coated on the surface, and spherical asphalt is replaced by the modified nano carbon powder, so that the anti-cracking performance of the castables is improved, the retention rate and the oxidation resistance of carbon materials in the service process are improved, the thermal shock resistance stability of the castables is improved, and the slag and molten iron infiltration and erosion resistance of the castables are enhanced; however, the preparation process, preparation cost, technical performance requirements, the particle size distribution of the carbon powder and the like of the oxide nano-film coated on the surface of the carbon powder are not introduced, and the actual production implementation of the patent technology is influenced. As can be seen, the domestic scholars used Al for blast furnace tapping runners2O3A great deal of work is done on the aspect of performance improvement of the-SiC-C castable, systematic analysis is carried out on the defects of the spherical asphalt carbon source of the conventional iron runner castable, strong demands for novel carbon sources are provided, and the attempt of the novel carbon source iron runner castable is developed, but the novel carbon sources still need to be actively developed and explored due to the restriction of cost problems and industrial production problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the casting material containing the nanocarbon for the blast furnace tapping channel, which has the characteristics of wide raw material sources, low cost, high-temperature mechanical strength, excellent chemical erosion and permeation resistance, good thermal shock stability, simple preparation, long service life and the like.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a pouring material containing nano carbon for a blast furnace tapping channel comprises the following base material components and additive components, wherein the base material components comprise the following components in percentage by mass: 20-30% of special grade high alumina clinker, wherein, 8-5mm (i.e. more than or equal to 5mm and less than 8mm, the particle size ranges are expressed below, the large number is open range, and the small number is smallClosed interval) of 15-25 percent, 5-3mm of 3-7 percent, brown corundum of 15-25 percent, wherein 5-3mm of 10-20 percent, 3-1mm of 5-15 percent, 3-1mm of white corundum of 5-10 percent, compact corundum of 10-15 percent, wherein 1-0.15mm of 5-10 percent and 325 meshes of 5-10 percent, silicon carbide of 15-25 percent, wherein 3-1mm of 5-10 percent, 1-0.15mm of 4-9 percent and 325 meshes of 5-10 percent, silicon oxide micropowder of 2-4 percent, α -Al2O34-9% of micro powder; 3-5% of pure calcium aluminate cement; 0.5 to 1.5 percent of dispersible nanometer carbon powder with the diameter of 20 to 200 nanometers; the additive components are as follows by mass percent: 1-1.5% of antioxidant; 0.05 to 0.2 percent of short carbon fiber; 0.1 to 0.2 percent of polyvinyl alcohol explosion-proof fiber; 0.15 to 0.3 percent of water reducing agent; among the dense corundum, 325-mesh carbon nano-film coated dense corundum.
Further, the mass percentage of the dispersible nano carbon powder of 20-200 nanometers is 1-1.5%.
Furthermore, 1-0.15mm of the dense corundum is also coated with the nano carbon film; the mass percentage of the dispersible nanometer carbon powder of 20-200 nanometers is 0.5-1 percent.
The dense corundum is coated with a layer of nano carbon film on the surface of the dense corundum particles, the thickness of the nano carbon film can be controlled within the range of 20-200 nanometers, the fixed carbon content of the nano carbon film is not less than 90%, and the fixed carbon content of the dispersible nano carbon powder is not less than 80%.
The antioxidant is composed of one or two of 180-mesh metal silicon powder and magnesium aluminum alloy powder, the water reducing agent is composed of commercially available sodium tripolyphosphate and FS20 produced by Pasteur Germany, and the added mass percentage of FS20 is preferably 0.02-0.1%.
Al of the special grade high-alumina clinker2O3More than or equal to 88 percent of brown corundum Al2O3The content is more than or equal to 90 percent, and the SiC content of the silicon carbide is more than or equal to 97 percent by weight.
The melting point of the polyvinyl alcohol explosion-proof fiber is less than or equal to 90 ℃, and the water-soluble temperature is more than or equal to 55 ℃.
The diameter of the short carbon fiber is 5-9 mu m, the length of the short carbon fiber is 0.5-2.5 mm, and the carbon content is more than or equal to 95 wt%.
The casting material for the blast furnace tapping channel containing the nano carbon is prepared by the following method:
(1) carrying out chemical vapor deposition on the surface of the dense corundum (325 meshes, or 325 meshes and 1-0.15mm) to be coated with the nano carbon film to coat the nano carbon film, so as to obtain the nano carbon film coated dense corundum with the corresponding granularity, wherein the fixed carbon content of the nano carbon film is more than or equal to 90%, and the thickness of the nano carbon film is 20-200 nm; the chemical vapor deposition device discharges fine particle products in waste gas in the preparation process of the carbon nano-film, and the required dispersible carbon nano-powder can be collected, the particle size is 20-200 nanometers, and the content of fixed carbon is more than or equal to 80 percent.
(2) Weighing raw materials of various specifications and types according to the required mass of the raw materials for later use.
(3) Adding the nano carbon film coated compact corundum, the rest fine powder base material and the added components into a wheel-grinding type mixer, carrying out wheel-grinding mixing for 20-30 minutes, adding the rest base material, carrying out wheel-grinding mixing for 20-30 minutes, uniformly mixing, and then discharging to obtain the pouring material for the blast furnace tapping channel containing the nano carbon. The fine powder base material is a base material with the granularity less than 0.15 mm.
The method comprises the following steps of coating a nano carbon film on the surface of a compact corundum particle, wherein the nano carbon film is treated by adopting the prior art, for example, equipment disclosed by a powder rotating chemical vapor deposition device (application publication No. CN103668112A) applied in Chinese patent application is adopted, acetylene is used as a carbon source gas, the chemical vapor deposition temperature is 650-750 ℃, the deposition time is 0.5-5 hours, and the nano carbon film is coated on the surface of the compact corundum particle by chemical vapor deposition, so that the preparation of the compact corundum raw material coated by the nano carbon film is completed, the fixed carbon content of the nano carbon film is more than or equal to 90%, and the thickness. And collecting fine particle products in waste gas discharged by a chemical vapor deposition device in the preparation process of the carbon nano-film to obtain the required dispersible nano-carbon, wherein the particle size or the thickness of the required dispersible nano-carbon is 20-200 nanometers, and the content of the fixed carbon is more than or equal to 80 percent. Under the chemical vapor deposition process conditions, the nano carbon film neutralized dispersible nano carbon is mainly amorphous carbon, contains a small amount of graphite crystal, and can be soaked by a solvent.
The invention has the beneficial effects that:
the inventionAiming at the existing Al2O3The SiC-C iron runner spherical asphalt has the defects of large thermal cracking holes, low carbon residue rate, poor oxidation resistance, serious pollution in the baking process and the like, 325-mesh fine powder compact corundum is coated by a nano carbon film or 325-mesh fine powder compact corundum is coated by 1-0.15mm fine particles, and dispersible nano carbon is used for replacing spherical asphalt, so that the carbon residue rate of a carbon source is improved, the spherical asphalt thermal cracking holes and baking cracking pollution are avoided, the uniform dispersion condition of the nano carbon in the castable and the contact probability and the contact area of the nano carbon with refractory raw materials of the castable are obviously improved, the distribution of the nano carbon in the castable is homogenized, particularly the nano carbon source carrier dispersion mode of the nano carbon film coated compact fine particles and fine powder, the erosion resistance, high temperature resistance and thermal shock resistance of the nano carbon are effectively exerted, and the compactness and permeability resistance of the castable are improved, the thermal expansion and contraction are absorbed through the flexibility among the nano particles, and the thermal shock stability of the castable is further improved; aiming at the problem of high price of the pure corundum raw material of the conventional iron runner castable, the special-grade high-aluminum clinker and corundum raw materials with different purities are compounded, so that the characteristics of the raw materials are fully exerted, the performance difference among the raw materials is coordinated, the sintering condition of the castable under the working condition is improved, the high-temperature mechanical property and the thermal shock stability of the castable are improved, and the manufacturing cost of the castable is reduced. The integral erosion resistance and the thermal shock stability of the castable are improved by multi-stage addition of the silicon carbide raw material. The short carbon fiber has high strength, excellent high-temperature performance, good erosion resistance and drawing toughening effect, improves the service performance of the castable and the thermal shock stability, avoids winding and caking in the conventional stirring, mixing and dispersing process of the carbon fiber through the limitation of the length of the short carbon fiber, and ensures the uniform dispersion of the short carbon fiber. The molten shrinkage of the polyvinyl alcohol fiber at the temperature of less than or equal to 90 ℃ ensures the smooth discharge of water vapor in the casting material baking process, and improves the anti-burst performance of the casting material baking process. The antioxidant consisting of one or two of 180-mesh silicon metal powder and magnesium aluminum alloy powder expands the anti-oxidation temperature range of the antioxidant and improves the carbon retention rate in the service process of the castable. The sodium tripolyphosphate and FS20 water reducing agent are used for makingThe method reduces the water addition amount of the casting material, and improves the flow property, the construction property and the casting compactness of the casting material. According to the preparation method, the nano carbon film is coated with the fine powder compact corundum, the rest fine powder base material (the granularity is less than 0.15mm) and the added components are added into a wheel-grinding type mixer to be subjected to wheel-grinding mixing for 20-30 minutes, so that the dispersion uniformity of the chopped carbon fibers and the nano carbon is improved, the surface activity and the wettability of the chopped carbon fibers and the nano carbon are enhanced, the contact probability, the contact area and the bonding tightness of the chopped carbon fibers and the nano carbon and other refractory raw materials are enhanced, the dispersion uniformity of the chopped carbon fibers and the nano carbon in the castable is further improved, and the thermal shock stability and the corrosion and penetration resistance of molten slag and molten iron of the castable are improved. Finally, the purposes of improving the comprehensive performance of the castable, reducing the raw material cost of the castable, prolonging the service life of the iron runner castable, reducing the consumption cost of refractory materials and the like are achieved.
Compared with the conventional iron runner castable, the prepared castable for the blast furnace tapping channel containing the nano-carbon has the advantages that various properties are obviously improved through scientific and reasonable selection of the novel nano-carbon and optimization of raw material components and a preparation method, the volume density is improved by 1-3% compared with the conventional iron runner castable, the breaking strength is improved by 5-10% after heat treatment at normal temperature and different temperatures, the water-cooling thermal shock resistance frequency at 1100 ℃ is improved by more than 20%, and slag corrosion and penetration are not obvious in a 1500 ℃ heat preservation 3h slag resistance experiment in an oxidizing atmosphere. In addition, along with the increase of the adding proportion of the nano carbon film coated compact corundum and the reduction of the adding proportion of the dispersible nano carbon powder, the aggregation of the nano carbon powder is effectively restrained, the dispersion uniformity of the nano carbon in the casting material is continuously improved, and the performance of the casting material containing the nano carbon for the blast furnace tapping channel is continuously improved. Therefore, the castable for the blast furnace tapping channel containing the nano carbon is obviously superior to the conventional castable for the tapping channel in various performance indexes through the nano carbon film coating on the surface of refractory raw material particles and the introduction of the dispersible nano carbon.
Detailed Description
The pouring material for the blast furnace tapping channel containing the nano carbon and the preparation method thereof are further detailed by combining with the embodiment:
example 1A castable for a blast furnace tapping channel containing nanocarbon, which comprises the following base material components and additive components, by mass, 25% of special-grade high-alumina clinker (wherein, 8-5mm is 20%, 5-3mm is 5%), 21% of brown corundum (wherein, 5-3mm is 14%, 3-1mm is 7%), 7% of white corundum (3-1mm), 12% of dense corundum coated with a nanocarbon film (wherein, 1-0.15mm is 6%, 325 meshes are 6%), 20% of silicon carbide (wherein, 3-1mm is 7%, 1-0.15mm is 6%, 325 meshes are 7%), 3% of silicon oxide micropowder, α -Al2O35 percent of micro powder, 4.5 percent of pure calcium aluminate cement and 0.75 percent of dispersible nanometer carbon powder (20-200 nanometers), which are used as base material components; 1.25 percent of antioxidant, 0.1 percent of chopped carbon fiber, 0.15 percent of polyvinyl alcohol explosion-proof fiber and 0.25 percent of water reducing agent.
The nano carbon film coated compact corundum refers to the compact corundum coated by the nano carbon film, the thickness of the nano carbon film can be controlled within the range of 20-200 nanometers, the fixed carbon content of the nano carbon film is not less than 90%, and the fixed carbon content of the dispersible nano carbon is not less than 80%.
The antioxidant is prepared by mixing 180-mesh metal silicon powder and magnesium-aluminum alloy powder according to a mass ratio of 1:2, and the water reducing agent is prepared by compounding commercially available sodium tripolyphosphate and FS20 according to a mass ratio of 3: 2.
Al of the special grade high-alumina clinker2O3More than or equal to 88 percent of brown corundum Al2O3The content is more than or equal to 90 percent, and the SiC content of the silicon carbide is more than or equal to 97 percent by weight.
The melting point of the polyvinyl alcohol fiber is less than or equal to 90 ℃, and the water-soluble temperature is more than or equal to 55 ℃.
The diameter of the short carbon fiber is 5-9 mu m, the length of the short carbon fiber is 0.5-2.5 mm, and the carbon content is more than or equal to 95 wt%.
The casting material containing the nano carbon for the blast furnace tapping channel is prepared by the following preparation method:
(1) preparing a nano carbon film coated compact corundum, namely coating the surface of purchased compact corundum (1-0.15mm and 325 meshes) with a nano carbon film by chemical vapor deposition, wherein the fixed carbon content of the nano carbon film is more than or equal to 90 percent, and the thickness of the nano carbon film is 20-200 nanometers; and collecting fine particle products in waste gas discharged by a chemical vapor deposition device in the preparation process of the carbon nano-film to obtain the required dispersible nano-carbon, wherein the particle size is 20-200 nanometers, and the content of the fixed carbon is more than or equal to 80 percent.
(2) Weighing raw materials of various specifications and types according to the required mass of the raw materials for later use.
(3) And (3) adding the nano carbon film coated compact corundum, the rest fine powder base material (the granularity is less than 0.15mm) and the added components into a wheel-grinding type mixer, carrying out wheel-grinding mixing for 20-30 minutes, adding the rest base material, carrying out wheel-grinding mixing for 20-30 minutes, uniformly mixing, and then discharging to obtain the pouring material for the blast furnace tapping channel containing the nano carbon.
The preparation method comprises the following steps of coating a nano carbon film on the surface of compact corundum particles by chemical vapor deposition, wherein the nano carbon film is coated by adopting equipment disclosed by a powder rotating chemical vapor deposition device (application publication No. CN103668112A) applied in Chinese patent, acetylene is used as a carbon source gas, the chemical vapor deposition temperature is 650-750 ℃, the deposition time is 0.5-5 hours, and the nano carbon film is coated on the surface of the compact corundum particles to complete the preparation of the compact corundum raw material coated by the nano carbon film, the fixed carbon content of the nano carbon film is more than or equal to 90%, and the thickness of the nano carbon film can. And collecting fine particle products in waste gas discharged by a chemical vapor deposition device in the preparation process of the carbon nano-film to obtain the required dispersible nano-carbon, wherein the particle size or the thickness of the required dispersible nano-carbon is 20-200 nanometers, and the content of the fixed carbon is more than or equal to 80 percent. Under the chemical vapor deposition process conditions, the nano carbon film and the dispersible nano carbon are mainly amorphous carbon, contain a small amount of graphite crystal and can be soaked by a solvent.
Example 2A castable for a blast furnace tapping channel containing nanocarbon, which is the same as example 1 except that the raw materials are different in mass percentage and the nanocarbon film-coated components are slightly different, wherein the castable comprises 25% of special-grade high-alumina clinker (wherein 8-5mm is 15-25% and 5-3mm is 3-7%), 21% of brown corundum (wherein 5-3mm is 10-20% and 3-1mm is 5-15%), 7% of white corundum (3-1mm), 5.5% of dense corundum (1-0.15mm), 6% of nanocarbon film-coated dense corundum (325 meshes), 20% of silicon carbide (wherein 3-1mm is 7%, 1-0.15mm is 6% and 325 meshes are 7%), 3% of silicon oxide micropowder, α -Al2O35% of micro powder and pure aluminum acid4.5 percent of calcium cement, 1.25 percent of dispersible nano carbon powder (20-200 nanometers), 1.25 percent of antioxidant, 0.1 percent of polyvinyl alcohol explosion-proof fiber, 0.15 percent of chopped carbon fiber and 0.25 percent of water reducing agent.
Example 3A castable for a blast furnace tapping channel containing nanocarbon, which is the same as example 1 except that the castable is prepared from 25% by mass of special-grade high-alumina clinker (wherein, 8-5mm is 20% and 5-3mm is 5%), 21% by mass of brown corundum (wherein, 5-3mm is 14% and 3-1mm is 7%), 7% by mass of white corundum (3-1mm), 10.5% by mass of dense corundum (wherein, 1-0.15mm is 5.5% and 325 mesh is 5%), 20% by mass of silicon carbide (wherein, 3-1mm is 7%, 1-0.15mm is 6% and 325 mesh is 7%), 3% by mass of silicon oxide micropowder, α -Al2O35% of micro powder, 4.5% of pure calcium aluminate cement, 2% of dispersible nano carbon powder (20-200 nm), 1.5% of antioxidant, 0.1% of chopped carbon fiber, 0.15% of polyvinyl alcohol explosion-proof fiber and 0.25% of water reducer.
Compared with the conventional iron runner castable, the castable for the blast furnace tapping channel containing the nano-carbon prepared in the embodiment 3 of the invention has less obvious performance improvement compared with the conventional iron runner castable, however, through the treatment of coating the dense corundum with the nano carbon film, the volume density of the castable is improved by 1-3%, the breaking strength is improved by 5-10% after heat treatment at normal temperature and different temperatures, the water-cooling thermal shock resistance frequency at 1100 ℃ is improved by more than 20%, and the slag corrosion and penetration are not obvious in a slag resistance experiment at 1500 ℃ for 3 hours under an oxidizing atmosphere, so that along with the increase of the adding proportion of the dense corundum coated with the nano carbon film and the reduction of the adding proportion of the dispersible nano carbon powder, the aggregation of the nano carbon powder is effectively restrained, the dispersion uniformity of the nano carbon in the castable is continuously improved, the performance of the castable for the blast furnace tapping runner containing the nano carbon is continuously improved, and the performance of the castable in example 1. In addition, the inventor also carries out nano carbon film coating treatment on the compact corundum with the thickness of 1-0.15mm, and the improvement degree of the performance is obviously lower than that of the compact corundum with the thickness of 325 meshes (namely lower than that of the embodiment 2), so that the invention selectively carries out nano carbon film coating on the fine-grained base material, and each performance index of the prepared castable for the blast furnace tapping channel containing nano carbon is obviously superior to that of the conventional iron channel castable.
Claims (8)
1. The casting material containing the nanocarbon for the blast furnace tapping channel is characterized by comprising the following base material components and additive components, wherein the base material components comprise, by mass, 20-30% of special-grade high-alumina clinker, 15-25% of 8-5mm, 3-7% of 5-3mm, 15-25% of brown corundum, 10-20% of 5-3mm, 5-15% of 3-1mm, 5-10% of 3-1mm white corundum, 10-15% of compact corundum, 5-10% of 1-0.15mm, 5-10% of 325 mesh, 15-25% of silicon carbide, 5-10% of 3-1mm, 4-9% of 1-0.15mm, 5-10% of 325 mesh, 2-4% of silicon oxide, α -Al micropowder2O34-9% of micro powder; 3-5% of pure calcium aluminate cement; 0.5 to 1.5 percent of dispersible nanometer carbon powder with the diameter of 20 to 200 nanometers; the additive components comprise the following components in percentage by mass: 1-1.5% of antioxidant; 0.05 to 0.2 percent of short carbon fiber; 0.1 to 0.2 percent of polyvinyl alcohol explosion-proof fiber; 0.15 to 0.3 percent of water reducing agent; among the dense corundum, 325-mesh carbon nano-film coated dense corundum.
2. The nanocarbon-containing castable for blast furnace tapping runners according to claim 1, characterized in that: the mass percentage of the dispersible nano carbon powder of 20-200 nm is 1-1.5%.
3. The nanocarbon-containing castable for blast furnace tapping runners according to claim 1, characterized in that: in the compact corundum, 1-0.15mm of the compact corundum is also coated with the nano carbon film; the mass percentage of the dispersible nanometer carbon powder of 20-200 nanometers is 0.5-1 percent.
4. The nanocarbon-containing castable for blast furnace tapping runners according to claim 1, 2 or 3, characterized in that: the antioxidant consists of one or two of silicon metal powder and magnesium-aluminum alloy powder with the granularity of 180 meshes, and the water reducing agent consists of commercially available sodium tripolyphosphate and FS20 produced by Pasteur Germany.
5. The nanocarbon-containing castable for blast furnace tapping runners according to claim 1, 2 or 3, characterized in that: al of the special grade high-alumina clinker2O3More than or equal to 88 percent of brown corundum Al2O3The content is more than or equal to 90 percent, and the SiC content of the silicon carbide is more than or equal to 97 percent by weight.
6. The nanocarbon-containing castable for blast furnace tapping runners according to claim 1, 2 or 3, characterized in that: the melting point of the polyvinyl alcohol explosion-proof fiber is less than or equal to 90 ℃, and the water-soluble temperature is more than or equal to 55 ℃.
7. The nanocarbon-containing castable for blast furnace tapping runners according to claim 1, 2 or 3, characterized in that: the diameter of the short carbon fiber is 5-9 mu m, the length of the short carbon fiber is 0.5-2.5 mm, and the carbon content is more than or equal to 95 wt%.
8. The nanocarbon-containing castable for blast furnace tapping runners according to any one of claims 1 to 7, characterized in that:
1) according to the requirements, carrying out chemical vapor deposition on the surface of the dense corundum to be coated with the nano carbon film to coat the nano carbon film, so as to obtain the nano carbon film coated dense corundum, wherein the fixed carbon content of the nano carbon film is more than or equal to 90%, and the thickness of the nano carbon film is 20-200 nm;
2) weighing raw materials of various specifications and types according to the mass percentage of the raw materials for later use;
3) adding the nano carbon film coated compact corundum, the rest fine powder base material and the added components into a wheel-grinding type mixer, carrying out wheel-grinding mixing for 20-30 minutes, adding the rest base material, carrying out wheel-grinding mixing for 20-30 minutes, uniformly mixing, and then discharging to obtain the pouring material for the blast furnace tapping channel containing nano carbon; the fine powder base material is a base material with the granularity less than 0.15 mm.
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| CN114180975A (en) * | 2021-12-01 | 2022-03-15 | 钢城集团凉山瑞海实业有限公司 | Castable for bottom working layer of semisteel tank |
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