CN109467418B - Long-life iron runner castable for hot repair - Google Patents
Long-life iron runner castable for hot repair Download PDFInfo
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- CN109467418B CN109467418B CN201811417432.7A CN201811417432A CN109467418B CN 109467418 B CN109467418 B CN 109467418B CN 201811417432 A CN201811417432 A CN 201811417432A CN 109467418 B CN109467418 B CN 109467418B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 58
- 229910052751 metal Inorganic materials 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000004568 cement Substances 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 23
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 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 14
- 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 13
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 13
- 239000000701 coagulant Substances 0.000 claims abstract description 12
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 12
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 10
- 239000010426 asphalt Substances 0.000 claims abstract description 10
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims abstract description 9
- 239000010431 corundum Substances 0.000 claims abstract description 9
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 9
- 239000002270 dispersing agent Substances 0.000 claims abstract description 8
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000011863 silicon-based powder Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 229910052580 B4C Inorganic materials 0.000 claims description 5
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical group Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 claims description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- 229920002978 Vinylon Polymers 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 abstract description 4
- 239000001257 hydrogen Substances 0.000 abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 238000001514 detection method Methods 0.000 description 12
- 239000002994 raw material Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000012782 phase change material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- VXYADVIJALMOEQ-UHFFFAOYSA-K tris(lactato)aluminium Chemical compound CC(O)C(=O)O[Al](OC(=O)C(C)O)OC(=O)C(C)O VXYADVIJALMOEQ-UHFFFAOYSA-K 0.000 description 1
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- 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
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- 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
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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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
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- 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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Abstract
The invention discloses a long-life iron runner castable for hot repair, which comprises the following components in percentage by mass: 56% -64% of brown corundum; 5% -13% of silicon carbide; 2 to 3 percent of ball asphalt; 1.5 to 2.5 percent of pure calcium aluminate cement; 8% -12% of alumina micropowder; 1.5 to 2.5 percent of silicon dioxide micro powder; 11% -13% of silicon carbide powder; 1% -2% of composite antioxidant; 0.1 to 0.3 percent of metal aluminum powder; the explosion-proof fiber is less than 0.1 percent; 0.2 to 0.4 percent of dispersant; the coagulant is less than 0.08%. The iron runner castable disclosed by the invention adopts a novel coagulant, so that the metal aluminum powder in the iron runner castable generates hydrogen in advance, the exhaust hole is opened by gas generation when the castable does not generate curing strength, and the aluminum runner castable is matched with proper metal aluminum powder and low-melting-point explosion-proof fibers, so that the castable is ensured to have excellent high-temperature service performance while meeting construction conditions.
Description
Technical Field
The invention belongs to the technical field of composite materials, and particularly relates to an iron runner castable.
Background
In recent two years, with the rising of steel prices, various iron and steel enterprises emphasize high-yield and normal-yield in order to rush the yield and strengthen smelting, an iron runner is an important part of an iron making process, and the extension of the fixed repair period of the iron runner has great significance for the iron and steel companies. On the premise of ensuring safe use, the service life of the iron runner material is ensured, the fixed repair period of the blast furnace is prolonged, and the iron runner is one of the primary survival conditions of iron runner contracted enterprises. Particularly, for a large number of domestic single-taphole blast furnaces and 1000-cubic level blast furnaces, the time for casting and constructing the iron runner is seriously short, and the iron runner casting material needs to be cast within about 16 hours under the condition of hot runner repair.
The common practice in China is to sacrifice the service performance of the material in order to meet the construction performance, add a large amount of cement (3% -5%) in the material so as to accelerate the setting and ensure sufficient strength, add a large amount of water (4.5% -5.5%) to the iron runner castable, reduce the compactness so as to facilitate the exhaust and prevent the burst. The matching performance of cement solidification and metal aluminum powder gassing plays an important role in the anti-explosion performance of the iron runner castable, but no report is made at home and abroad on which specific method can be adopted to directly and effectively control the gassing of the metal aluminum powder so as to match the cement solidification with the gassing of the metal aluminum powder. In field use, the phenomena of material bulging, baking burst and the like often occur in the iron runner castable, the service life of the iron runner castable is seriously influenced, and the potential hazard of burying the blast furnace for safely tapping iron is avoided.
CN201510114691.2 provides a fast-baking explosion-proof iron runner castable and a use method thereof, silica sol is used for combination, and the iron runner castable can be fast-baked, anti-burst and short in construction time. However, the silica sol is troublesome to construct and easy to freeze and lose efficacy in winter, and the silica sol combined iron runner castable material has poor compactness and poor using effect compared with cement combination.
CN201510132196.4 provides a quick-drying iron runner castable, a preparation method and a use method thereof, which comprises titanium carbide, coal gangue, an antioxidant, pure calcium aluminate cement, micro silicon powder, an explosion-proof agent and a water reducing agent, and has the technical effects of improving thermal shock resistance, erosion resistance and oxidation resistance, greatly reducing water consumption, and having the characteristic of quick drying, but the safety problem that cement curing is not matched with metal aluminum powder gassing is not solved.
CN201010185737.7 provides an explosion-proof iron runner castable, the adopted explosion-proof agent is aluminum powder, aluminum lactate and explosion-proof fiber, and the castable can meet the rapid construction and use requirements of medium and small single-taphole blast furnace iron runners. However, the water addition amount is large, and a large amount of low-melting substances such as clay are contained, so that the safety problem that cement solidification is not matched with metal aluminum powder gassing is not solved.
Disclosure of Invention
The invention aims to provide a long-life hot-repair iron runner castable, which solves the problem that cement solidification and metal aluminum powder gas evolution are possibly unmatched, and effectively prolongs the service life of the hot-repair iron runner castable by comprehensively optimizing the proportion.
In order to achieve the purpose, the technical scheme is as follows:
a long-life iron runner castable for hot repair comprises the following components in percentage by mass:
according to the scheme, the particle size of the brown corundum is less than 12 mm; particles with different particle diameters in brown corundumThe mass percentage of the particles is as follows: 8-12mm, 8-8 mm, 18-3-5 mm, 15-1 mm, 15-3 mm, 0-1mm, 0-8%. Al contained therein2O3＞95wt％，Fe2O3＜0.3wt％。
According to the scheme, the grain diameter of the silicon carbide is less than 1mm, wherein the SiC content is more than or equal to 98 percent, and the Fe content is higher than or equal to 98 percent2O3Less than 0.3 wt% and fineness less than or equal to 74 um.
According to the scheme, the particle size of the ball asphalt is not more than 1.5 mm.
According to the scheme, the pure calcium aluminate cement is pure calcium aluminate 71 cement.
According to the scheme, the fineness of the alumina micro powder is less than 1.2 micrometers, and the purity is more than 99%; wherein, Al2O3＞99wt％、Na2O＜0.1wt％。
According to the scheme, SiO in the silicon dioxide micropowder2The content is more than 96 wt%.
According to the scheme, the composite antioxidant is a mixture of boron carbide powder and metal silicon powder, and the mass ratio of the boron carbide powder to the metal silicon powder is 1: 3.5; the granularity of the metal silicon powder is less than or equal to 45 mu m, and the Si content is more than 98.5 percent.
According to the scheme, the SiC content in the silicon carbide powder is more than or equal to 98 percent, and the fineness is less than or equal to 74 um.
According to the scheme, the dispersing agent is a compound containing polyacrylate, polycarboxylic acid and alumina powder.
According to the scheme, the coagulant is rhombic dodecacalcium heptaluminate powder; and is added before on-site construction.
According to the scheme, the explosion-proof fiber is water-soluble vinylon explosion-proof fiber, the melting point of the explosion-proof fiber is 90 ℃, and the length of the explosion-proof fiber is 5-3 mm.
According to the scheme, the metal aluminum powder is produced by a nitrogen atomization process, and the fineness is less than or equal to 74 um.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention greatly reduces the water adding amount of the iron runner castable; the micro powder is used for filling air holes, the density is increased, the addition amount of cement is reduced through the self-bonding property of the composite micro powder, the generation of low-melting phase is reduced, and the high-temperature use performance of the material is ensured.
2) The iron runner castable disclosed by the invention adopts a novel coagulant, so that the metal aluminum powder in the iron runner castable generates hydrogen in advance, the exhaust hole is opened by gas generation when the castable does not generate curing strength, and the aluminum runner castable is matched with proper metal aluminum powder and low-melting-point explosion-proof fibers, so that the castable is ensured to have excellent high-temperature service performance while meeting construction conditions. The problem of cement solidification and metal aluminium powder gas formation probably unmatched is solved, the gas formation of metal aluminium powder is directly effectively controlled.
Detailed Description
The following examples further illustrate the technical solutions of the present invention, but should not be construed as limiting the scope of the present invention.
In the following examples, brown alumina Al was used2O3＞95wt％，Fe2O3Less than 0.3 wt%. The grain diameter is less than 12 mm; the brown corundum comprises the following particles with different particle diameters in percentage by mass: 8-12mm, 8-8 mm, 18-3-5 mm, 15-1 mm, 15-3 mm, 0-1mm, 0-8%.
The granularity of the ball asphalt is not more than 1.5 mm; the embodiment selects the high-temperature ball asphalt, and the asphalt with high carbon residue content is favorable for improving the slag resistance of the iron runner castable.
The pure calcium aluminate cement is pure calcium aluminate 71 cement. Can effectively improve the normal temperature, medium temperature and high temperature strength and the thermo-mechanical property of the cement, and the main chemical component of the calcium aluminate cement is Al2O3(68.5-70.5) wt.%, CaO (28.5-30.5) wt.%, hardly containing other impurities.
Al in the alumina micropowder2O3＞99wt％、Na2O is less than 0.1wt percent. High purity and low sodium content; the fineness of the alpha-phase-change material is d50 less than 1.2 micrometers, the crystal diameter of the primary crystal is controlled to be about 0.5um, the fluctuation range of the crystal diameter is within 0.05um, the activity is very stable, the alpha-phase conversion rate reaches more than 95%, and the alpha-phase-change material has better water reducing performance, good fluidity and good strength development.
The used silicon dioxide micro powder SiO2More than 96 wt% and a pH of 6-8.
The used anti-oxidation agent is a mixture of boron carbide powder and metal silicon powder, and the mass mixing ratio is 1: 3.5. The granularity of the metal silicon powder is less than or equal to 45 mu m, and the Si content is more than 98.5 percent.
The metal aluminum powder is produced by a nitrogen atomization process, and the fineness is less than or equal to 74 um.
The SiC powder is more than or equal to 98 wt% and has fineness less than or equal to 74 um.
The used dispersing agent is PC8159, is an efficient composite water reducing agent, has excellent water reducing performance, is not easy to bleed, has good stability, and avoids the bulging and cracking of the iron runner castable.
The used coagulant is KAD-20, the main chemical components are similar to pure calcium aluminate cement, the main crystal phase is rhombic dodecacalcium heptaluminate, so that the metal aluminum powder in the iron runner castable generates hydrogen in advance, and the exhaust hole is opened by gas generation when the iron runner castable does not generate curing strength. The coagulant is added before the in-situ casting.
The explosion-proof fiber is water-soluble explosion-proof fiber, the melting point of the explosion-proof fiber is 90 ℃, and the length of the explosion-proof fiber is 5-3 mm.
Example 1
A long-life iron runner castable for hot repair comprises the following components in percentage by mass: 56% of brown corundum; 13% of silicon carbide; 2.4 percent of ball asphalt; 2.5 percent of pure calcium aluminate cement; 10.905% of alumina micropowder; 1.5 percent of silicon dioxide micro powder; 11% of silicon carbide powder; 2% of composite antioxidant; 0.3% of metal aluminum powder and 0.075% of explosion-proof fiber; 0.3 percent of dispersant; 0.02% of coagulant. Weighing the raw materials according to the proportion and fully mixing; adding water (the mass of the water is 4.1 percent of the total mass of the raw materials), uniformly stirring, and then vibrating and forming; and naturally drying the formed sample for 24h, and then carrying out heat treatment at 110 ℃ for 24h to prepare the long-life hot repair iron runner castable sample.
The long-life hot-repair iron runner castable sample prepared in this example was subjected to performance testing, and the results are shown in table 1. The performance detection method is carried out according to the current national standard or industry standard, and the obtained detection result is the following average detection result of 3 times.
TABLE 1
Example 2
A long-life iron runner castable for hot repair comprises the following components in percentage by mass: 64 percent of brown corundum; 5% of silicon carbide; 2% of ball asphalt; 1.5 percent of pure calcium aluminate cement; 12% of alumina micro powder; 1.77 percent of silicon dioxide micropowder; 12% of silicon carbide powder; 1% of composite antioxidant; 0.2% of metal aluminum powder and 0.05% of explosion-proof fiber; 0.4 percent of dispersant; 0.08 percent of coagulant. Weighing the raw materials according to the proportion and fully mixing; adding water (the mass of the water is 3.9 percent of the total mass of the raw materials), uniformly stirring, and then vibrating and forming; and naturally drying the formed sample for 24h, and then carrying out heat treatment at 110 ℃ for 24h to prepare the long-life hot repair iron runner castable sample.
The long-life hot-repair iron runner castable sample prepared in this example was subjected to performance testing, and the results are shown in table 2. The performance detection method is carried out according to the current national standard or industry standard, and the obtained detection result is the following average detection result of 3 times.
TABLE 2
Example 3
A long-life iron runner castable for hot repair comprises the following components in percentage by mass: 60% of brown corundum; 9 percent of silicon carbide with the thickness of 0-1 mm; 2.5 percent of ball asphalt; 2% of pure calcium aluminate cement; 10% of alumina micro powder; 2% of silicon dioxide micropowder; 13% of silicon carbide powder; 1.06 percent of composite antioxidant; 0.1% of metal aluminum powder and 0.1% of explosion-proof fiber; 0.2% of a dispersant; 0.04% of coagulant. Weighing the raw materials according to the proportion and fully mixing; adding water (the mass of the water is 4 percent of the total mass of the raw materials), uniformly stirring, and then vibrating and forming; and naturally drying the formed sample for 24h, and then carrying out heat treatment at 110 ℃ for 24h to prepare the long-life hot repair iron runner castable sample.
The long-life hot-repair iron runner castable sample prepared in this example was subjected to performance testing, and the results are shown in table 3. The performance detection method is carried out according to the current national standard or industry standard, and the obtained detection result is the average detection result of 3 times.
TABLE 3
Example 4
A long-life iron runner castable for hot repair comprises the following components in percentage by mass: 64 percent of brown corundum; 5 percent of silicon carbide with the thickness of 0-1 mm; 3% of ball asphalt; 2.5 percent of pure calcium aluminate cement; 8% of alumina micropowder; 2.5 percent of silicon dioxide micro powder; 12.96 percent of silicon carbide powder; 1.5 percent of composite antioxidant; 0.12 percent of metal aluminum powder and 0.1 percent of explosion-proof fiber; 0.3 percent of dispersant; 0.02% of coagulant. Weighing the raw materials according to the proportion and fully mixing; adding water (the mass of the water is 4.2 percent of the total mass of the raw materials), uniformly stirring, and then vibrating and forming; and naturally drying the formed sample for 24h, and then carrying out heat treatment at 110 ℃ for 24h to prepare the long-life hot repair iron runner castable sample.
The long-life hot-repair iron runner castable sample prepared in this example was subjected to performance testing, and the results are shown in table 4. The performance detection method is carried out according to the current national standard or industry standard, and the obtained detection result is the average detection result of 3 times.
TABLE 4
The results show that the iron runner castable for hot repair with long service life has the characteristics of low water adding amount, good compactness, good anti-explosion property, wide application range, long service life and the like.
The iron runner castable is applied to 1350m steel works in Shanxi Jianlong Steel works3And 630m3The blast furnace main channel shows that the blast furnace main channel is usedThe effect completely meets the field use requirement: the metal aluminum powder in the iron runner castable generates hydrogen in advance in the casting process, the gas is generated to open the exhaust hole when the castable does not generate curing strength, and the anti-explosion effect of the low-melting-point anti-explosion fiber is added, so that the safety of the iron runner castable in construction application is greatly improved, the castable meets the construction conditions and has excellent high-temperature service performance, and the service life of the iron runner castable is about 30 percent higher.
It is apparent that the above embodiments are only examples for clearly illustrating and do not limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are therefore intended to be included within the scope of the invention as claimed.
Claims (6)
1. The long-life iron runner castable for hot repair is characterized by comprising the following components in percentage by mass:
56% -64% of brown corundum;
5% -13% of silicon carbide;
2% -3% of ball asphalt;
1.5-2.5% of pure calcium aluminate cement;
8% -12% of alumina micro powder;
1.5% -2.5% of silicon dioxide micro powder;
11% -13% of silicon carbide powder;
1% -2% of a composite antioxidant;
0.1 to 0.3 percent of metal aluminum powder,
the explosion-proof fiber is less than 0.1 percent;
0.2% -0.4% of a dispersant;
less than 0.08% of coagulant;
the fineness of the alumina micro powder is less than 1.2 micrometers, and the purity is more than 99%; wherein, Al2O3＞99wt%、Na2O＜0.1wt%；
The composite antioxidant is a mixture of boron carbide powder and metal silicon powder, and the mass ratio of the boron carbide powder to the metal silicon powder is 1: 3.5; the granularity of the metal silicon powder is less than or equal to 45 mu m, and the Si content is more than 98.5 percent;
the coagulant is rhombic dodecacalcium heptaluminate powder; and is added before the site construction.
2. The long-life castable for hot-repair iron runner according to claim 1, wherein the brown corundum has a grain size of less than 12 mm; al contained therein2O3＞95wt%，Fe2O3＜0.3wt%。
3. The long-life castable for hot-repair of iron runner as claimed in claim 1, wherein the grain size of said silicon carbide is less than 1mm, wherein the SiC content is greater than or equal to 98%, Fe2O3＜0.3wt%。
4. The long-life hot-repair runner castable according to claim 1, wherein said pitch balls have a particle size of not more than 1.5 mm.
5. The long-life castable for hot repair of claim 1, wherein the SiC content in the silicon carbide powder is not less than 98%, and the fineness is not more than 74 μm.
6. The long-life castable for hot-repair of iron runner according to claim 1, wherein said explosion-proof fiber is a water-soluble vinylon explosion-proof fiber having a melting point of 90 ℃ and a length of 5 to 3 mm.
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| CN109485391A (en) * | 2018-10-24 | 2019-03-19 | 长兴明天炉料有限公司 | Blast furnace iron outlet groove material for repairing |
| CN110372339A (en) * | 2019-07-19 | 2019-10-25 | 中冶武汉冶金建筑研究院有限公司 | A kind of long-life iron runner castable and its construction method |
| CN110372342A (en) * | 2019-08-15 | 2019-10-25 | 中冶武汉冶金建筑研究院有限公司 | A kind of no cement iron runner castable of skimming tool prefabricated component |
| CN111003954B (en) * | 2019-12-30 | 2021-11-16 | 河南和成无机新材料股份有限公司 | High-purity calcium aluminate cement, preparation method and application thereof |
| CN111302814B (en) * | 2020-01-16 | 2021-12-21 | 中冶武汉冶金建筑研究院有限公司 | Aluminum silicon carbide carbonaceous slurry and preparation method thereof |
| CN112174683A (en) * | 2020-10-19 | 2021-01-05 | 莱芜钢铁集团新兴液气有限公司 | Repairing material for ladle cover of thermal-state tundish and construction method thereof |
| CN115141008B (en) * | 2022-07-25 | 2023-09-01 | 河北国亮新材料股份有限公司 | Long-service-life swing groove castable and preparation method thereof |
| CN115321996B (en) * | 2022-08-29 | 2023-09-22 | 中冶武汉冶金建筑研究院有限公司 | Iron runner castable containing submicron composite antioxidant and preparation method thereof |
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