CN116239369A - Alumina-based castable and application thereof - Google Patents
Alumina-based castable and application thereof Download PDFInfo
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- CN116239369A CN116239369A CN202111483331.1A CN202111483331A CN116239369A CN 116239369 A CN116239369 A CN 116239369A CN 202111483331 A CN202111483331 A CN 202111483331A CN 116239369 A CN116239369 A CN 116239369A
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- bauxite
- castable
- alumina
- strength
- temperature
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 47
- 239000000835 fiber Substances 0.000 claims abstract description 30
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 15
- 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 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 8
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 24
- 238000010079 rubber tapping Methods 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 150000004645 aluminates Chemical group 0.000 claims description 2
- -1 polypropylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229910021487 silica fume Inorganic materials 0.000 claims description 2
- 239000000843 powder Substances 0.000 abstract description 10
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 2
- 239000012752 auxiliary agent Substances 0.000 abstract 1
- 239000011230 binding agent Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000005266 casting Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 239000010431 corundum Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—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
- C04B35/103—Refractories from grain sized mixtures containing non-oxide refractory materials, e.g. carbon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/14—Discharging devices, e.g. for slag
-
- 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
-
- 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
-
- 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
-
- 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
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/447—Phosphates or phosphites, e.g. orthophosphate, hypophosphite
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
- C04B2235/524—Non-oxidic, e.g. borides, carbides, silicides or nitrides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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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
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—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
Abstract
The invention discloses an alumina-based castable and application thereof. The high-strength bauxite-based castable takes bauxite as a main raw material, 8-5mm, 5-3mm, 3-1mm and 1-0 mm four-level granularity matching are adopted as aggregate, 0.075mm alumina powder and silicon carbide fine powder are adopted as fine powder, high-alumina cement and silicon micro powder are adopted as binding agent, sodium tripolyphosphate and sodium hexametaphosphate are adopted as auxiliary agents, and a proper amount of steel fibers and explosion-proof fibers are added. The bauxite-based castable solves the contradiction between normal temperature strength and high temperature strength of common castable by adjusting the proportion of the composite micro powder, and prepares the bauxite-based castable with high normal temperature strength and high temperature strength. The castable has a normal-temperature compressive strength of up to 193MPa, a normal-temperature flexural strength of up to 24MPa, a high-temperature compressive strength of up to 120.6MPa (1300 ℃ for 3 hours) and a high-temperature flexural strength of up to 22.5MPa.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to an alumina castable for a blast furnace tapping channel cover.
Background
The blast furnace tapping runner is used for discharging blast furnace slag and molten iron, and the tapping runner cover is subjected to radiation heat of high temperature molten iron up to 2000 ℃, and is easy to damage due to long-term radiation heat erosion of slag and molten iron, so that the tapping runner cover needs to be protected by using high-strength bauxite castable. The existing tapping channel covering material has the defects of poor high-low temperature mechanical strength, easy collapse and poor thermal stability, so that the maintenance is frequent, and the operation rate of equipment is affected.
Disclosure of Invention
In order to solve the technical problems of poor mechanical strength at high and low temperatures, easy collapse and poor thermal stability of castable for a blast furnace tapping channel cover in the prior art, the technical scheme of the invention is as follows;
the castable for the blast furnace tapping channel cover is prepared from the following raw materials in parts by weight, which total 100%.
| Species of type | Mass ratio |
| Bauxite | 50％～85％ |
| Silicon carbide | 5％～20％ |
| Silica micropowder | 10％～20％ |
| High alumina cement | 12％～30％ |
| Sodium tripolyphosphate | 0.01％～0.5％ |
| Sodium hexametaphosphate | 0.01％～0.5％ |
| Steel fiber | 0.2％～5％ |
| Explosion-proof fiber | 0.01％～2％ |
The graded powder is preferably prepared from the following components in parts by weight:
the graded powder is preferably prepared from the following components in parts by weight:
| species of type | Mass ratio |
| Bauxite | 58％～75％ |
| Silicon carbide | 8％～12％ |
| Silica micropowder | 8％～12％ |
| High alumina cement | 15％～22％ |
| Sodium tripolyphosphate | 0.01％～0.3％ |
| Sodium hexametaphosphate | 0.01％～0.3％ |
| Steel fiber | 0.2％～3％ |
| Explosion-proof fiber | 0.01％～1％ |
The bauxite is aggregate obtained by mixing bauxite with the granularity of 8-5mm, 5-3mm, 3-1mm, 1-0 mm and 0.075mm, wherein the mass ratio of the bauxite with the granularity of 8-5mm, 5-3mm, 3-1mm, 1-0 mm and 0.075mm in the aggregate is 2: (1-1.5): (1-1.6): (1-1.4): (1.9-2.2);
the granularity of the silicon carbide is 100-300 meshes, the mass percentage of SiC in the silicon carbide is more than or equal to 90 percent, preferably 200 meshes, and the mass percentage of SiC in the silicon carbide is more than or equal to 95 percent;
the silicon micropowder is silica fume, and the model is 970;
the high-alumina cement is aluminate cement, and the model is CA70 cement;
the sodium tripolyphosphate is prepared by Na 5 P 3 O 10 The percentage content is more than or equal to 80 percent, preferably Na in sodium tripolyphosphate 5 P 3 O 10 The percentage content is more than or equal to 90 percent;
in the sodium hexametaphosphate, P 2 O 5 The percentage content is more than or equal to 60 percent, preferably P in sodium hexametaphosphate 2 O 5 The percentage content is more than or equal to 68 percent;
the steel fiber is stainless steel fiber containing Cr, and the model is 446 steel fiber preferably;
the explosion-proof fiber is made of polypropylene, and the length of the explosion-proof fiber is preferably 3-6 mm;
the castable has a normal-temperature compressive strength of up to 193MPa, a normal-temperature flexural strength of up to 24MPa, a high-temperature compressive strength of up to 120.6MPa (1300 ℃ for 3 hours) and a high-temperature flexural strength of up to 22.5MPa. The alumina-based castable has the following advantages: 1. the castable has low raw material cost, simple formula, easily obtained raw materials and simple production; 2. the casting material is cast, and the mechanical strength of the formed coating at normal temperature and high temperature is relatively high; 3. the volume density of the castable is moderate, and excessive load can not be generated; 4. the casting material is quick in molding, and the repairing material after molding can not generate cracks due to environmental problems (wind, high temperature and insolation), so that the repairing material is suitable for environments with high humidity, high salt mist and high ultraviolet irradiation; 5. after molding, the castable has high strength under normal temperature and high temperature conditions, and can resist heat radiation impact; 6. the molded alloy has excellent corrosion resistance and water resistance, and can be used in industries with high temperature requirements such as blast furnaces, aerospace and the like.
The invention has the advantages and beneficial effects that:
according to the castable for the blast furnace tapping channel cover, bauxite is adopted as the castable aggregate, so that the refractoriness and the high-temperature strength of the castable are improved; the silicon carbide is added into the castable, so that the silicon carbide has high thermal conductivity and small thermal expansion coefficient, is difficult to infiltrate by molten steel and slag, and the oxidation of the castable at high temperature belongs to protection type oxidation, has an oxidation resistance obviously superior to that of a carbon material, and enhances the high-temperature chemical property stability of the castable after molding; the steel fibers are added into the castable, so that the toughness, the high-temperature strength and the high-temperature ablation resistance of the castable are improved; the casting material is added with sodium tripolyphosphate and sodium hexametaphosphate, and plays roles of a dispersing agent and a water reducing agent; the casting material is added with the explosion-proof fiber, and after the casting material is molded, the casting material is baked, the explosion-proof fiber begins to soften, shrink and melt, and finally air holes are formed. It forms the gas pocket in the internal distribution of construction, lightens internal stress, prevents bursting, improves whole life.
The high-strength castable disclosed by the invention has high strength under normal temperature and high temperature conditions, can resist the radiant heat of high-temperature slag and molten iron in a blast furnace tapping channel without collapse or falling, and can effectively ensure the effective operation of a blast furnace. In addition, the high-strength castable is acid and alkali resistant. The invention can also be used in certain industries requiring high-strength working conditions under high temperature conditions.
Detailed Description
The invention will be further described with reference to specific examples and accompanying tables, and advantages and features of the invention will become apparent as the description proceeds.
Example 1
High-strength castable for blast furnace tapping channel covers, wherein the total mass fraction of bauxite is 63.05% according to weight percentage (total 100%), and Al in the bauxite 2 O 3 The mass percentage of bauxite with the granularity of 8-5mm is more than or equal to 85 percent, the mass percentage of bauxite with the granularity of less than 5-3mm is 21 percent, the mass percentage of bauxite with the granularity of less than 5-3mm is 10.5 percent, the mass percentage of bauxite with the granularity of less than 3-1mm is 11.05 percent, the mass percentage of bauxite with the granularity of less than 1-more than 0.075mm is 10.5 percent, and the mass percentage of bauxite with the granularity of 200 meshes is 20.95 percent;
the mass fraction of 200 meshes of silicon carbide is 9%, and the mass percentage of SiC in the silicon carbide is more than or equal to 95%; the mass fraction of the silicon micro powder is 10%; the mass fraction of CA60 cement is 16%; the mass fraction of sodium tripolyphosphate is 0.08%, na in sodium tripolyphosphate 5 P 3 O 10 The percentage content is more than or equal to 90 percent; the mass fraction of the sodium hexametaphosphate is 0.07 percent, and the content of P in the sodium hexametaphosphate is 0.07 percent 2 O 5 The percentage content is more than or equal to 68 percent; the mass fraction of 446 steel fibers is 1.4%, and the mass fraction of explosion-proof fibers is 0.4%.
The high-light castable for the blast furnace tapping channel cover, which is prepared by the proportion, has the water addition amount of 7.5-8.5% of the mass of the castable, and the performances are shown in table 1.
TABLE 1 compressive and flexural Strength index
Example 2
High-strength castable for blast furnace tapping channel, which comprises, by weight (100% of total), bauxite with total mass fraction of 60.83%, al in bauxite 2 O 3 The mass percentage of bauxite with the granularity of 8-5mm is more than or equal to 85 percent, the mass percentage of bauxite with the granularity of less than 5-3mm is 19 percent, the mass percentage of bauxite with the granularity of less than 3-1mm is 10 percent, the mass percentage of bauxite with the granularity of less than 1-more than 0.075mm is 10 percent, and the mass percentage of bauxite with the granularity of 200 meshes is 17.83 percent;
the mass fraction of 200 meshes of silicon carbide is 7%, and the mass percentage of SiC in the silicon carbide is more than or equal to 95%; the mass fraction of the silicon micro powder is 11.5%; the mass fraction of CA70 cement is 18.5%; the mass fraction of sodium tripolyphosphate is 0.04%, na in sodium tripolyphosphate 5 P 3 O 10 The percentage content is more than or equal to 90 percent; the mass fraction of the sodium hexametaphosphate is 0.03 percent, and the content of P in the sodium hexametaphosphate is 0.03 percent 2 O 5 The percentage content is more than or equal to 68 percent; the mass fraction of 446 steel fibers is 1.6%, and the mass fraction of explosion-proof fibers is 0.5%.
The high-light castable for the blast furnace tapping channel cover, which is prepared by the proportion, has the water addition amount of 7.5-8.5% of the mass of the castable, and the performances are shown in table 1.
TABLE 2 compressive and flexural Strength index
Example 3
High-strength castable for blast furnace tapping channel, which comprises, by weight (100% of total), bauxite with total mass fraction of 60.84%, al in bauxite 2 O 3 The mass percentage of bauxite with the granularity of 8-5mm is 18.84 percent, the mass percentage of bauxite with the granularity of less than 5-3mm is 10 percent, the mass percentage of bauxite with the granularity of less than 3-1mm is 11 percent, and the mass percentage of bauxite with the granularity of less than 1-more than 0.075mm is 10 percentThe mass fraction of bauxite with the granularity of 200 meshes is 18 percent;
the mass fraction of 200 meshes of silicon carbide is 7%, and the mass percentage of SiC in the silicon carbide is more than or equal to 95%; the mass fraction of the silicon micro powder is 10.5%; the mass fraction of CA70 cement is 18%; the mass fraction of sodium tripolyphosphate is 0.03%, na in sodium tripolyphosphate 5 P 3 O 10 The percentage content is more than or equal to 90 percent; the mass fraction of the sodium hexametaphosphate is 0.03 percent, and the content of P in the sodium hexametaphosphate is 0.03 percent 2 O 5 The percentage content is more than or equal to 68 percent; 446 steel fiber 3% by mass; the mass fraction of the explosion-proof fiber is 0.6%.
The high-light castable for the blast furnace tapping channel cover, which is prepared by the proportion, has the water addition amount of 7.5-8.5% of the mass of the castable, and the performances are shown in table 1.
TABLE 3 compressive and flexural Strength index
Examples 1, 2 and 3, the normal temperature strength and the high temperature strength in examples 1 to 3 are gradually increased by optimizing the grain size distribution, adjusting the proportion of the composite micro powder and the like, the normal temperature compressive strength can reach 193.0MPa, the normal temperature flexural strength can reach 24.0MPa, the high temperature compressive strength can reach 120.6MPa, the high temperature flexural strength can reach 22.5MPa, the contradiction between the normal temperature strength and the high temperature strength in the common castable is solved, and the bauxite castable with very high normal temperature strength and high temperature strength is prepared
Comparative example
The performance indexes of the two corundum-based high-strength castable sold by Zhengzhou Shengyang refractory materials science and technology Co., ltd are shown in the following table.
TABLE 4 compressive and flexural Strength index
Two corundum-based high-strength castable sold by Zhengzhou Shengyang refractory science and technology Co., ltd. In comparative example have high-temperature strength only, wherein the high-temperature compressive strength is up to 100MPa, the high-temperature flexural strength is up to 12MPa, the medium-temperature compressive strength is lower, the normal-temperature compressive strength is up to 12MPa, and the normal-temperature flexural strength is up to 8MPa; in examples 1 to 3, the room temperature and high temperature strength in example 1 was the lowest: the normal temperature compressive strength is 160.5MPa, the normal temperature flexural strength is 20.4MPa, the high temperature compressive strength is 107.0MPa, the high temperature flexural strength is 15.3MPa, all the strength is larger than that of the castable in the comparative example, but the price of bauxite is only one fourth of that of corundum.
Claims (7)
1. An alumina-based castable is characterized in that: according to weight percentage, the bauxite castable consists of bauxite, 5-20% of silicon carbide, 10-20% of silicon micropowder, 12-30% of high alumina cement, 0.01-0.5% of sodium tripolyphosphate, 0.01-0.5% of sodium hexametaphosphate, 0.2-5% of steel fiber, 0.01-2% of explosion-proof fiber and the balance of bauxite, wherein the total weight percentage is 100%.
2. The alumina-based castable according to claim 1, wherein: according to weight percentage, the bauxite castable consists of 8-15% of bauxite, 8-15% of silicon carbide, 15-26% of silica micropowder, 0.01-0.4% of high alumina cement, 0.01-0.4% of sodium tripolyphosphate, 0.2-4% of steel fiber, 0.01-1.5% of explosion-proof fiber, and the balance of bauxite, wherein the total weight percentage is 100%.
3. The alumina-based castable according to claim 1, wherein: according to weight percentage, the bauxite castable consists of bauxite, 8-12% of silicon carbide, 8-12% of silicon micropowder, 15-22% of high alumina cement, 0.01-0.3% of sodium tripolyphosphate, 0.01-0.3% of sodium hexametaphosphate, 0.2-3% of steel fiber, 0.01-1% of explosion-proof fiber, and the balance of bauxite, wherein the total weight percentage is 100%.
4. The alumina-based castable according to claim 1 to 3, wherein: al in the bauxite 2 O 3 Is of mass percent of (a)The content of the components is more than or equal to 85 percent; the bauxite is prepared by fully mixing five-grade granularity grading, the mass ratio of the bauxite with the granularity of 8-5mm, less than 5-3mm, less than 3-1mm, less than 1-more than 0.075mm and less than 0.075mm is 2: (1-1.5): (1-1.6): (1-1.4): (1.9-2.2).
5. The alumina-based castable according to claim 1 to 3, wherein: the granularity of the silicon carbide is 100-300 meshes, and the mass percentage of SiC in the silicon carbide is more than or equal to 90%; the silicon micropowder is silica fume; the high alumina cement is aluminate cement; the sodium tripolyphosphate is prepared by Na 5 P 3 O 10 The percentage content is more than or equal to 90 percent; in the sodium hexametaphosphate, P 2 O 5 The percentage content is more than or equal to 68 percent; the steel fibers are 446 steel fibers; the explosion-proof fiber is made of polypropylene, and the length of the explosion-proof fiber is 3-6 mm.
6. The alumina-based castable according to claim 1 to 5, used as a castable for a blast furnace tapping spout cover.
7. The alumina-based castable according to claim 1-5 can be used for other castable in industries requiring higher mechanical strength under high temperature conditions.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101734934A (en) * | 2009-10-28 | 2010-06-16 | 郑州真金耐火材料有限责任公司 | High-strength steel fibre castable |
| CN103819203A (en) * | 2013-10-31 | 2014-05-28 | 江苏顺星耐火科技有限公司 | Mullite high-strength refractory castable |
| CN105481380A (en) * | 2014-09-19 | 2016-04-13 | 青岛百键城环保科技有限公司 | Low-cost novel steel fiber refractory castable |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101734934A (en) * | 2009-10-28 | 2010-06-16 | 郑州真金耐火材料有限责任公司 | High-strength steel fibre castable |
| CN103819203A (en) * | 2013-10-31 | 2014-05-28 | 江苏顺星耐火科技有限公司 | Mullite high-strength refractory castable |
| CN105481380A (en) * | 2014-09-19 | 2016-04-13 | 青岛百键城环保科技有限公司 | Low-cost novel steel fiber refractory castable |
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