CN114873995A - Low-expansion high-bending-resistance tundish retaining wall castable - Google Patents
Low-expansion high-bending-resistance tundish retaining wall castable Download PDFInfo
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- CN114873995A CN114873995A CN202210509610.9A CN202210509610A CN114873995A CN 114873995 A CN114873995 A CN 114873995A CN 202210509610 A CN202210509610 A CN 202210509610A CN 114873995 A CN114873995 A CN 114873995A
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- particle size
- alumina
- magnesite
- retaining wall
- resistance
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- 239000002245 particle Substances 0.000 claims abstract description 80
- 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 53
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 43
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 43
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 43
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 23
- 239000010431 corundum Substances 0.000 claims abstract description 21
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002699 waste material Substances 0.000 claims abstract description 12
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims abstract description 11
- 235000019799 monosodium phosphate Nutrition 0.000 claims abstract description 11
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- 239000010703 silicon Substances 0.000 claims abstract description 11
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims abstract description 11
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000428 dust Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004568 cement Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 6
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 239000003643 water by type Substances 0.000 claims description 3
- 238000010410 dusting Methods 0.000 claims 2
- 239000011819 refractory material Substances 0.000 abstract description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 14
- 239000002893 slag Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 229910001570 bauxite Inorganic materials 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 7
- 239000000395 magnesium oxide Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000002131 composite material Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910052596 spinel Inorganic materials 0.000 description 4
- 239000011029 spinel Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 229910052839 forsterite Inorganic materials 0.000 description 3
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- -1 magnesium aluminate Chemical class 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate 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
- C04B35/01—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
- 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
- C04B35/6303—Inorganic additives
- C04B35/6306—Binders based on phosphoric acids or phosphates
- C04B35/6313—Alkali metal or alkaline earth metal phosphates
-
- 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
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/74—Ceramic products containing macroscopic reinforcing agents containing shaped metallic materials
- C04B35/76—Fibres, filaments, whiskers, platelets, or the like
-
- 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
- C04B2235/3205—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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- 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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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
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- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
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Abstract
The invention relates to the technical field of refractory materials of a tundish working layer, in particular to a low-expansion high-bending-resistance tundish retaining wall castable which comprises the following raw materials in percentage by mass: 13-16% of 85 alumina with the particle size of 15-8mm, 13-16% of 85 alumina with the particle size of 8-5mm, 6-8% of 85 alumina with the particle size of 5-3mm, 6-10% of 85 alumina with the particle size of 3-1mm, 5-10% of 85 alumina with the particle size of 1-0mm, 6-10% of 91 magnesite with the particle size of 5-3mm, 6-10% of 91 magnesite with the particle size of 3-1mm, 4-9% of 95 magnesite with the particle size of 1-0mm, 3-5% of 95 magnesite with the particle size of 200 meshes, 10-13% of white corundum dust removal powder, 2-5% of chrome corundum waste, 2% of silicon micropowder, 1-2% of aluminum oxide, 0.2-0.5% of 71 mm, 0.2-0.3% of sodium dihydrogen phosphate, 0.05-0.1% of sodium tripolyphosphate, 0.1-0.3% of organic fibers and 1-1.5% of steel fibers, compared with the prior art, has the advantages of low expansion coefficient, high breaking strength, moderate cost and the function of purifying molten steel.
Description
Technical Field
The invention relates to the technical field of refractory materials of a tundish working layer, in particular to a low-expansion high-bending-resistance tundish retaining wall castable.
Background
The tundish retaining wall plays a very critical role in the configuration of a tundish refractory material, and mainly has the main functions of eliminating a slow flow region or a stagnant flow region of molten steel in a tundish, adjusting a flow field of the molten steel, enabling the molten steel to flow along a steel slag interface, shortening the floating time and distance of harmful impurities in the molten steel, being beneficial to purifying the molten steel and slowing down the temperature fluctuation of the molten steel at different parts in the tundish. The retaining wall is wholly immersed in molten steel during use, the temperature is higher than 1500 ℃ and even reaches 1550 ℃, and meanwhile, the retaining wall is impacted by the pressure difference of the molten steel on two sides of the retaining wall, so that the retaining wall needs to have higher strength under the condition of high temperature. Therefore, the existing tundish retaining wall is mainly made of alumina particles-corundum powder, is prefabricated and molded by adding a small amount of castable consisting of a bonding agent and an adjusting component, can be used online after being baked, and has the advantages of higher strength at high temperature, higher cost and no effect of purifying molten steel, and even brings new impurities into the molten steel. Therefore, the bauxite/magnesia composite type tundish retaining wall castable attracts people's attention, and can well take the performance and cost into consideration.
However, the bauxite/magnesia composite tundish retaining wall castable has the defect of large high-temperature linear expansion coefficient, particularly under the condition of large size of the retaining wall, the addition amount of low-cost magnesia is limited, the high-temperature strength is rapidly reduced due to excessive addition, accidents such as fracture and collapse are easy to occur during use, great potential safety hazards are brought, and a large amount of molten steel is polluted and greatly lost due to the occurrence of the accidents. Therefore, the development of a low-expansion high-fracture-resistance tundish retaining wall castable based on alumina/magnesia composite is urgently needed, so that the cost is reduced, and the use requirement is met, especially the use requirement of a long-life tundish is met.
The Chinese invention patent (application number: 201910071941.7) discloses a high-alkalinity slag-resistant tundish slag-retaining wall castable and a preparation method thereof, wherein the castable comprises the following raw materials in parts by weight: 50-80 parts of high bauxite, 5-15 parts of sintered bauxite spinel fine powder, 3-8 parts of sintered magnesia particles, 3-8 parts of sintered magnesia fine powder, 6-12 parts of alpha-Al 2O3 micro powder, 2-6 parts of aluminate cement, 0.5-1 part of silicon micro powder, 0-3 parts of stainless steel fiber, 0-0.2 part of explosion-proof agent and 0.1-0.4 part of water reducing agent. According to the scheme, for solving the problem that the slag retaining wall of the continuous casting tundish encounters serious corrosion of the high-alkalinity steel slag when steel is poured, the tundish slag retaining wall product capable of meeting the use requirement of the high-alkalinity steel slag is prepared by utilizing the characteristic that the magnesium aluminate spinel has good corrosion resistance to the alkaline steel slag and adopting the technology of adding presynthesized spinel and generating spinel through in-situ reaction, and the requirement of customers on smelting clean steel is fully met.
The invention Chinese patent (application number: 201010257943.4) discloses a forsterite tundish slag blocking wall castable and a production process thereof, wherein the castable is prepared from the following raw materials, by weight, 5-70 parts of forsterite, 15-85 parts of magnesite, 5-15 parts of corundum powder, 3-5 parts of a composite additive, 0.1 part of organic fiber and 1 part of steel fiber. The production process comprises the steps of adding aggregate in the raw materials into a stirrer, uniformly mixing and stirring, adding fine powder and the composite additive, stirring for 2-3 minutes, adding water when the materials are uniformly mixed and stirred, stirring for 2-3 minutes, discharging, vibration molding, maintaining, drying and packaging. The scheme adopts the combined action of the forsterite and the magnesia, reduces the formula cost of the product, and adopts the composite additive, the organic fiber, the steel fiber and the like with good performance to improve the strength of the product and ensure the construction performance and the service performance of the product.
Disclosure of Invention
The invention aims to provide a low-expansion high-fracture-resistance tundish retaining wall castable to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a low-expansion high-bending-resistance tundish retaining wall castable comprises the following raw material components in percentage by mass: 13-16% of 85 alumina with the particle size of 15-8mm, 13-16% of 85 alumina with the particle size of 8-5mm, 6-8% of 85 alumina with the particle size of 5-3mm, 6-10% of 85 alumina with the particle size of 3-1mm, 5-10% of 85 alumina with the particle size of 1-0mm, 6-10% of 91 magnesite with the particle size of 5-3mm, 6-10% of 91 magnesite with the particle size of 3-1mm, 4-9% of 95 magnesite with the particle size of 1-0mm, 3-5% of 95 magnesite with the particle size of 200 meshes, 10-13% of white corundum dust removal powder, 2-5% of chrome corundum waste, 2% of silicon micropowder, 1-2% of aluminum oxide, 0.2-0.5% of 71.2-0.5% of sodium dihydrogen phosphate, 0.05-0.1% of sodium tripolyphosphate, 0.1-0.3% of organic fibers and 1-1.5% of steel fibers.
In a preferred embodiment of the present invention, the alumina powder is composed of 15% of 85 alumina having a particle size of 15 to 8mm, 16% of 85 alumina having a particle size of 8 to 5mm, 7% of 85 alumina having a particle size of 5 to 3mm, 9% of 85 alumina having a particle size of 3 to 1mm, 8.2% of 85 alumina having a particle size of 1 to 0mm, 9% of 91 magnesite having a particle size of 5 to 3mm, 8% of 91 magnesite having a particle size of 3 to 1mm, 4% of 95 magnesite having a particle size of 1 to 0mm, 3.5% of 95 magnesite having a particle size of 200 mesh, 12% of white dust removal powder, 3% of corundum waste, 2% of fine silicon powder, 1.4% of aluminum oxide, 0.3% of 71 cement, 0.22% of sodium dihydrogen phosphate, 0.08% of sodium tripolyphosphate, 0.15% of organic fiber, and 1.15% of steel fiber.
As a preferable scheme of the invention, the granularity of the white corundum dust removal powder is 200 meshes, and Al2O3 is more than or equal to 95 percent; the granularity of the chrome corundum waste is 200 meshes, and the Cr2O3 is more than or equal to 60 percent; SiO2 in the silicon micro powder is more than or equal to 92 percent; the crystal form of the alumina is alpha type, and the granularity is 1 mu m; 71 the Al2O3 content in the cement is +/-2 percent; sodium dihydrogen phosphate is industrial grade, and contains 2 crystal waters; sodium tripolyphosphate is of industrial grade; the melting point of the organic fiber is 105 ℃; the steel fiber is nickel-chromium alloy heat-resistant steel.
As a preferable scheme of the invention, the sum of the 3-1mm content of the 85 bauxite and the 3-1mm content of the 91 magnesite is more than or equal to 15 percent and less than or equal to 19 percent; the sum of the content of 1-0mm of 85 alumina and 1-0mm of 95 magnesite is more than or equal to 12 percent and less than or equal to 18 percent.
As a preferable scheme of the invention, the sum of the contents of the 91 magnesite and the 95 magnesite is more than or equal to 24% and less than or equal to 32%.
As a preferable scheme of the invention, the water adding rate of the retaining wall castable is 5.3-5.5% during material mixing.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the retaining wall, the white corundum dust removal powder and the chromium corundum waste are selected from the flue gas dust removal powder and the used refractory waste for recycling, so that the high-temperature strength of the retaining wall is improved, and meanwhile, the anti-corrosion performance of the retaining wall is greatly improved, so that the retaining wall has the characteristic of long service life, is matched with a long-service-life tundish for use, and can effectively improve the steel tapping amount of a single on-line tundish.
2. In the invention, sodium dihydrogen phosphate is selected to replace common sodium hexametaphosphate as a binding agent, so that the preservation time of the mixture can be greatly prolonged before the mixture is stirred without adding water, the caking phenomenon caused by overlong stacking time of the mixture in a workshop or moisture absorption is avoided, and the on-site manufacture is facilitated, therefore, the invention has the advantages of low expansion coefficient, high breaking strength, moderate cost and molten steel purification function by design
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
The invention provides a technical scheme that:
a low-expansion high-bending-resistance tundish retaining wall castable comprises the following raw material components in percentage by mass: 13-16% of 85 alumina with the particle size of 15-8mm, 13-16% of 85 alumina with the particle size of 8-5mm, 6-8% of 85 alumina with the particle size of 5-3mm, 6-10% of 85 alumina with the particle size of 3-1mm, 5-10% of 85 alumina with the particle size of 1-0mm, 6-10% of 91 magnesite with the particle size of 5-3mm, 6-10% of 91 magnesite with the particle size of 3-1mm, 4-9% of 95 magnesite with the particle size of 1-0mm, 3-5% of 95 magnesite with the particle size of 200 meshes, 10-13% of white corundum dust removal powder, 2-5% of chromium waste, 2% of silicon micropowder, 1-2% of aluminum oxide, 0.2-0.5% of 71 cement, 0.2-0.3% of sodium dihydrogen phosphate, 0.05-0.1% of sodium tripolyphosphate, 0.1-0.3% of organic fiber and 1-1.5% of steel fiber.
In a preferred embodiment of the present invention, the alumina particles are 15% of 85 alumina particles with a particle size of 15-8mm, 16% of 85 alumina particles with a particle size of 8-5mm, 7% of 85 alumina particles with a particle size of 5-3mm, 9% of 85 alumina particles with a particle size of 3-1mm, 8.2% of 85 alumina particles with a particle size of 1-0mm, 9% of 91 magnesite particles with a particle size of 5-3mm, 8% of 91 magnesite particles with a particle size of 3-1mm, 4% of 95 magnesite particles with a particle size of 1-0mm, 3.5% of 95 magnesite particles with a particle size of 200 mesh, 12% of white corundum dust removal powder, 3% of chrome corundum waste, 2% of silicon micropowder, 1.4% of aluminum oxide, 0.3% of 71 cement, 0.22% of sodium dihydrogen phosphate, 0.08% of sodium tripolyphosphate, 0.15% of organic fibers, and 1.15% of steel fibers.
As a preferred embodiment of the invention, the white corundum dust removal powder has the granularity of 200 meshes, and Al2O3 is more than or equal to 95 percent; the granularity of the chrome corundum waste is 200 meshes, and the Cr2O3 is more than or equal to 60 percent; SiO2 in the silicon micro powder is more than or equal to 92 percent; the crystal form of the alumina is alpha type, and the granularity is 1 mu m; 71 the Al2O3 content in the cement is +/-2 percent; sodium dihydrogen phosphate is industrial grade, and contains 2 crystal waters; sodium tripolyphosphate is of industrial grade; the melting point of the organic fiber is 105 ℃; the steel fiber is nickel-chromium alloy heat-resistant steel.
As a preferred embodiment of the invention, the sum of the 3-1mm content of the 85 bauxite and the 3-1mm content of the 91 magnesite is more than or equal to 15 percent and less than or equal to 19 percent; the sum of the content of 1-0mm of 85 alumina and 1-0mm of 95 magnesite is more than or equal to 12 percent and less than or equal to 18 percent.
In a preferred embodiment of the invention, the sum of the contents of the 91 magnesite and the 95 magnesite is not less than 24% and not more than 32%.
As a preferred embodiment of the invention, the water adding rate of the retaining wall castable is 5.3-5.5% during mixing.
The specific implementation case is as follows:
the following provides a specific embodiment of the low-expansion high-fracture-resistance tundish retaining wall castable.
The low-expansion high-bending-resistance tundish retaining wall castable in the embodiments 1 to 6 and the comparative examples 1 to 4 comprises the following raw material components in percentage by mass in a table 1;
TABLE 1 raw material composition (wt%) of examples 1 to 6 and comparative examples 1 to 4
The tundish retaining wall castable of the scheme has the following detection index ranges of qualified products: the water adding rate is 5.3-5.5 wt%; the volume density is more than or equal to 2.85g cm 3; the linear change rate is 0-0.5% at 1100 ℃/3h and 0-1% at 1550 ℃/3 h; the breaking strength is more than or equal to 10MPa at 110 ℃, more than or equal to 6MPa at 1100 ℃/3h, and more than or equal to 11.7MPa at 1550 ℃/3 h; the compressive strength is more than or equal to 70MPa at 110 ℃, more than or equal to 55MPa at 1100 ℃/3h, and more than or equal to 55MPa at 1550 ℃/3 h; the processing performance is as follows: the method is good; the slag resistance is as follows: no penetration and good erosion resistance.
Preparing samples of the low-expansion high-bending-resistance tundish retaining wall casting materials of the embodiments 1-6 and the comparative examples 1-4 according to GB/T4513.5 sample strips, and testing the volume density, the linear change rate, the bending strength and the compressive strength according to the test method in GB/T4513.6; judging the slag resistance by adopting a static crucible method, and observing the permeation resistance and the erosion resistance of the refractory material of the middle section of the crucible; the test results are listed in table 2.
TABLE 2 test results of examples 1 to 6 and comparative examples 1 to 4
As can be seen from a comparison of the data in tables 1 and 2: the low-expansion high-bending-resistance tundish retaining wall castable has the advantages of low expansion coefficient, high bending strength, moderate cost and molten steel purification function;
in comparative example 1, the content of alumina 85 having a particle size of 15 to 8mm is 20 wt% or more, and at this time, too many large particles are contained in the castable, which causes a decrease in processability during mixing, and a local cavity is liable to exist in the inside after molding, resulting in a decrease in strength and a lack of permeation resistance. The test result shows that: the breaking strength is 9.5MPa at 110 ℃, 7.3MPa at 1550 ℃/3h, the processability is poor, the anti-permeability is a small amount of permeation, and the detection result is unqualified;
in comparative example 2, the content of 0.25 wt% of sodium tripolyphosphate was too high, which resulted in a decrease in fluidity and an increase in water addition rate when water was added and stirred, a decrease in processability and an adverse effect on corrosion resistance, and it was liable to crack during baking after demolding, and a decrease in yield. The test result shows that: the water adding rate is 5.76 wt%, the processing performance is poor, and the corrosion resistance is poor;
in comparative example 3, the content of 0.8 wt% of 71 cement is higher, which causes local high-temperature overburning and sharp reduction of strength at medium and low temperatures of the castable, and CaO contained in 71 cement is unfavorable for corrosion resistance. The test result shows that: the linear change rate is-0.13% at 1550 ℃/3h, the breaking strength is 5.8MPa at 110 ℃, 5.1MPa at 1100 ℃/3h, 10.8MPa at 1550 ℃/3h, the compressive strength is 48.4MPa at 110 ℃, 43.9MPa at 1100 ℃/3h and 47.4MPa at 1550 ℃/3h, and the corrosion resistance is poor;
in comparative example 4, the content of 8 wt% of 95 magnesite with a particle size of 200 meshes is higher, the sum of the contents of 85 bauxite with a particle size of 3-1mm and 91 magnesite with a particle size of 3-1mm is lower than the content of 13 wt%, the reaction of aluminum, magnesium and silicon is stronger under a high temperature condition, the thermal expansion coefficient is increased, the sintering phenomenon under the high temperature condition is promoted, and the high temperature strength is not favorable. The test result shows that: the linear change rate is 1.45 percent at 1550 ℃/3h, and the corrosion resistance is poor.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. The low-expansion high-bending-resistance tundish retaining wall castable is characterized by comprising the following raw material components in percentage by mass: 13-16% of 85 alumina with the particle size of 15-8mm, 13-16% of 85 alumina with the particle size of 8-5mm, 6-8% of 85 alumina with the particle size of 5-3mm, 6-10% of 85 alumina with the particle size of 3-1mm, 5-10% of 85 alumina with the particle size of 1-0mm, 6-10% of 91 magnesite with the particle size of 5-3mm, 6-10% of 91 magnesite with the particle size of 3-1mm, 4-9% of 95 magnesite with the particle size of 1-0mm, 3-5% of 95 magnesite with the particle size of 200 meshes, 10-13% of white corundum dust removal powder, 2-5% of chrome corundum waste, 2% of silicon micropowder, 1-2% of aluminum oxide, 0.2-0.5% of 71.2-0.5% of sodium dihydrogen phosphate, 0.05-0.1% of sodium tripolyphosphate, 0.1-0.3% of organic fibers and 1-1.5% of steel fibers.
2. The low-expansion high-fracture-resistance tundish retaining wall castable according to claim 1, wherein the alumina 85 with the particle size of 15-8mm is 15%, the alumina 85 with the particle size of 8-5mm is 16%, the alumina 85 with the particle size of 5-3mm is 7%, the alumina 85 with the particle size of 3-1mm is 9%, the alumina 85 with the particle size of 1-0mm is 8.2%, the magnesite 91 with the particle size of 5-3mm is 9%, the magnesite 91 with the particle size of 3-1mm is 8%, the magnesite 95 with the particle size of 1-0mm is 4%, the magnesite 95 with the particle size of 200 meshes is 3.5%, the white corundum dusting powder is 12%, the chrome waste is 3%, the silicon micropowder is 2%, the aluminum oxide is 1.4%, the cement is 0.3%, the sodium dihydrogen phosphate is 0.22%, the sodium tripolyphosphate is 0.08%, the organic fiber is 0.15% and the steel fiber is 1.15%.
3. The low-expansion high-fracture-resistance tundish retaining wall castable according to claim 1, wherein the white corundum dusting powder has a particle size of 200 meshes, and Al2O3 is more than or equal to 95%; the granularity of the chrome corundum waste is 200 meshes, and the Cr2O3 is more than or equal to 60 percent; SiO2 in the silicon micro powder is more than or equal to 92 percent; the crystal form of the alumina is alpha type, and the granularity is 1 mu m; 71 the Al2O3 content in the cement is +/-2 percent; sodium dihydrogen phosphate is industrial grade, and contains 2 crystal waters; sodium tripolyphosphate is of industrial grade; the melting point of the organic fiber is 105 ℃; the steel fiber is nickel-chromium alloy heat-resistant steel.
4. The low-expansion high-fracture-resistance tundish retaining wall castable according to claim 1, wherein the sum of the contents of 3-1mm of 85 alumina and 3-1mm of 91 magnesite is more than or equal to 15% and less than or equal to 19%; the sum of the content of 1-0mm of 85 alumina and 1-0mm of 95 magnesite is more than or equal to 12 percent and less than or equal to 18 percent.
5. The low-expansion high-fracture-resistance tundish retaining wall castable according to claim 1, wherein the sum of the contents of 91 magnesite and 95 magnesite is not less than 24% and not more than 32%.
6. The low-expansion high-fracture-resistance tundish retaining wall castable according to claim 1, wherein the water addition rate of the retaining wall castable during mixing is 5.3-5.5%.
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