CN111559906A - Anti-skinning castable for carbide slag cement kiln smoke chamber and preparation method thereof - Google Patents
Anti-skinning castable for carbide slag cement kiln smoke chamber and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 50
- 239000002893 slag Substances 0.000 title claims abstract description 36
- 239000000779 smoke Substances 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 99
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 58
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 42
- 239000000843 powder Substances 0.000 claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 33
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 23
- 239000010431 corundum Substances 0.000 claims abstract description 22
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 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 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 13
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 6
- 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 description 6
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims description 2
- 239000011819 refractory material Substances 0.000 abstract description 18
- 238000012360 testing method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000003513 alkali Substances 0.000 description 7
- 238000005266 casting Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000007767 bonding agent Substances 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 3
- 229910052863 mullite Inorganic materials 0.000 description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 229910052661 anorthite Inorganic materials 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
-
- 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
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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
- C04B2235/44—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 or hypophosphite
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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
- C04B2235/50—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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- 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
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- Ceramic Products (AREA)
Abstract
The invention discloses an anti-skinning castable for a carbide slag cement kiln smoke chamber and a preparation method thereof, wherein the castable comprises the following raw materials in parts by weight: 0-18 parts of bauxite with the particle size of more than 5mm and less than or equal to 8mm, 35-55 parts of bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, 0-15 parts of bauxite with the particle size of more than or equal to 0.088mm and less than or equal to 1mm, 6-15 parts of silicon carbide with the particle size of 0.088mm, 5-20 parts of corundum with the particle size of less than 0.088mm, 3-8 parts of silicon carbide micro powder, 0-5 parts of bauxite micro powder, 4-9 parts of calcium aluminate cement, 3-6 parts of silica fume, 0-3 parts of heat-resistant steel fiber, 0-0.2 part of organic fiber, 0.1-0.3 part of deflocculant and 4-5 parts of water. The refractory material fired by the castable disclosed by the invention has excellent anti-skinning property and slag resistance, and is an ideal refractory material for a smoke chamber of a carbide slag cement kiln.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to an anti-skinning castable for a smoke chamber of a carbide slag cement kiln and a preparation method thereof.
Background
The carbide slag is the waste slag produced in the preparation of acetylene gas, PVC and other products, and can be used for the production of cement clinker and the like. Because the decomposition temperature of the carbide slag is low, the water vapor generated after decomposition during calcination can react with RO in the kiln gas2、SO2、Cl-When the gas is gathered, acid, alkali or salt precipitates are formed, extremely serious chemical erosion is generated on the refractory material of the flue chamber lining of the carbide slag cement kiln, the pores of the refractory material are increased, the strength is obviously reduced, and the service life of the refractory material is greatly reduced. The traditional high-alumina and clay castable takes cement and silica fume as a bonding agent, and the fired refractory material has low wear resistance and alkali corrosion resistance, poor anti-skinning performance and short service life, and is difficult to meet the use requirements of the refractory material of the smoke chamber of the carbide slag cement kiln.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides an anti-skinning castable for a carbide slag cement kiln smoke chamber and a preparation method thereof.
The invention provides an anti-skinning castable for a smoke chamber of a carbide slag cement kiln, which is characterized by comprising the following raw materials in parts by weight:
0-18 parts of bauxite with the particle size of more than 5mm and less than or equal to 8mm, 35-55 parts of bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, 0-15 parts of bauxite with the particle size of more than or equal to 0.088mm and less than or equal to 1mm, 5-15 parts of silicon carbide with the particle size of 0.088mm, 5-20 parts of corundum with the particle size of less than 0.088mm, 3-8 parts of silicon carbide micro powder, 0-6 parts of bauxite micro powder, 4-9 parts of calcium aluminate cement, 3-6 parts of silica fume, 0-3 parts of heat-resistant steel fiber, 0-0.2 part of organic fiber, 0.1-0.3 part of deflocculant and 4-5 parts of water.
Preferably, the bauxite has an alumina content > 86%.
Preferably, the fineness of the bauxite micro powder is more than or equal to 600 meshes.
Preferably, the particle size of the silicon carbide micro powder is less than 0.088 mm.
Preferably, the particle size of the silica fume is < 1 μm.
Preferably, the deflocculant is at least one of sodium tripolyphosphate and sodium hexametaphosphate.
Preferably, the calcium aluminate cement is at least one of pure calcium aluminate cement and high alumina cement.
Preferably, the corundum is at least one of fused corundum and sintered corundum.
The preparation method of the anti-skinning castable for the smoke chamber of the carbide slag cement kiln comprises the following steps:
s1, weighing bauxite with the particle size of more than 5mm and less than or equal to 8mm, bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, bauxite with the particle size of more than or equal to 0.088mm and less than 1mm, silicon carbide with the particle size of 0.088-1mm, corundum with the particle size of less than 0.088mm, silicon carbide micro powder, bauxite micro powder, calcium aluminate cement, silica fume, heat-resistant steel fibers, organic fibers and a deflocculant by weight, and uniformly mixing to obtain a mixture;
and S2, uniformly mixing the mixture with water to obtain the water-based paint.
Preferably, in the step S1, the mixing time is 3-5 min.
Preferably, in the step S2, the mixing time is 2-4 min.
In the raw material components of the castable, the silicon carbide belongs to a covalent bond compound, the strength is high, the wear resistance is good, the thermal conductivity is high, a small amount of silicon carbide micro powder is added, partial air holes of a matrix can be filled, so that the structure is more compact, the strength is improved, and the wear resistance of the castable is improved due to the fact that the silicon carbide is high in wear resistance; however, as the amount of addition increases, silicon carbide is generated in a high-temperature oxidizing atmosphereThe following oxidation occurs: SiC +2O2→SiO2+CO2SiO produced by oxidation thereof2And α -Al2O3When mullite is generated by the reaction, the volume is expanded, the structure is loose, the apparent porosity is increased, and the strength and the wear resistance are also reduced; moreover, as the content of the silicon carbide increases, the sintering resistance is gradually reflected, and the overall sintering property of the castable is deteriorated to a certain degree;
in the castable, Al is added2O3/SiO2When the content is low, a glaze layer can be generated on the surface under the alkaline condition to prevent further erosion of alkaline matters, so that the alkali resistance of the product is improved;
in the casting material, the silica fume can react with water to form loose spherical particle groups with charges, asymmetric charges such as-OH exist on the surface, higher potential energy is generated among the particle groups due to the repulsion of the same poles, the activity is very high, the mutual flowing is promoted, the fluidity and the low and medium temperature strength of the casting material can be greatly improved by adding the silica fume, but after the casting material is sintered at high temperature, the ceramic is serious, internal cracks are formed, and the strength is reduced;
in the casting material, the grading of particles has great influence on the fluidity of the casting material, and when the volume density difference between aggregate and powder is large, the aggregate is layered and segregated, the aggregate sinks, the friction resistance is increased, and the flow is blocked; when the content of the fine materials and the fine powder is relatively high, the dough has a large viscosity and shows a strong plasticity, resulting in a low fluidity. According to the invention, different particle raw materials are subjected to proper grading, so that the wear resistance and alkali resistance of the castable are improved, and the good fluidity of the castable can be maintained, so that the castable has strong processability, and the cast refractory material has good uniformity and compactness.
The invention has the following beneficial effects:
compared with the traditional high-alumina and clay castable, the low-alumina mullite castable is prepared by taking low-alumina mullite as aggregate, taking calcium aluminate cement, silica fume and silicon carbide as bonding agents and adding additives such as fibers, and the like, and the composition of the bonding agents is CaO-Al2O3-SiO2Ternary systemThe corundum-mullite-anorthite phase region is moved into the corundum-calcium hexaluminate-anorthite phase region to form a compact tissue structure, so that the prepared refractory material has good strength and wear resistance, meanwhile, the obtained castable has good fluidity, high strength, high wear resistance and alkali corrosion resistance through adjusting the content of each component and the grading of particle size, and the fired refractory material has high strength, high thermal shock resistance stability, high wear resistance and alkali corrosion resistance, excellent skinning resistance and slag resistance, can bear high-temperature thermal shock and corrosion of harmful waste gas, greatly prolongs the service life, reduces the maintenance cost, and is an ideal refractory material for carbide slag calcining smoke chambers, decomposing furnaces and other parts.
Drawings
FIG. 1 shows the slag resistance of a refractory material made of a castable of the present invention, wherein the left side is example 2 and the right side is example 3.
FIG. 2 shows the anti-skinning properties of a refractory material made from a castable material of the present invention, wherein the left side is example 2 and the right side is example 3.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
An anti-skinning castable for a carbide slag cement kiln smoke chamber comprises the following raw materials in parts by weight:
0-18 parts of bauxite with the particle size of more than 5mm and less than or equal to 8mm, 35-55 parts of bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, 0-15 parts of bauxite with the particle size of more than or equal to 0.088mm and less than or equal to 1mm, 5-15 parts of silicon carbide with the particle size of 0.088mm, 5-20 parts of corundum with the particle size of less than 0.088mm, 3-8 parts of silicon carbide micro powder, 0-6 parts of bauxite micro powder, 4-9 parts of calcium aluminate cement, 3-6 parts of silica fume, 0-3 parts of heat-resistant steel fiber, 0-0.2 part of organic fiber, 0.1-0.3 part of deflocculant and 4-5 parts of water.
Example 2
An anti-skinning castable for a carbide slag cement kiln smoke chamber comprises the following raw materials in parts by weight:
15 parts of bauxite with the particle size of more than 5mm and less than or equal to 8mm, 40 parts of bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, 12 parts of silicon carbide with the particle size of 0.088-1mm, 15 parts of fused corundum with the particle size of less than 0.088mm, 8 parts of silicon carbide micro powder with the particle size of less than 0.088mm, 2 parts of bauxite micro powder with 800 meshes, 7 parts of pure calcium aluminate cement, 4 parts of silica fume with the particle size of less than 1 mu m, 1.5 parts of heat-resistant steel fiber, 0.1 part of organic fiber, 0.15 part of sodium tripolyphosphate and 5 parts of water.
The preparation method comprises the following steps:
s1, weighing bauxite with the particle size of more than 5mm and less than or equal to 8mm, bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, silicon carbide with the particle size of 0.088-1mm, fused corundum with the particle size of less than 0.088mm, silicon carbide micro powder with the particle size of less than 0.088mm, bauxite micro powder with 800 meshes, pure calcium aluminate cement, silica fume with the particle size of less than 1 mu m, heat-resistant steel fibers, organic fibers and sodium tripolyphosphate according to weight, and mixing for 3min to obtain a mixture;
and S2, mixing the mixture with water for 3min to obtain the product.
Example 3
An anti-skinning castable for a carbide slag cement kiln smoke chamber comprises the following raw materials in parts by weight:
15 parts of bauxite with the particle size of more than 5mm and less than or equal to 8mm, 40 parts of bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, 5 parts of silicon carbide with the particle size of 0.088-1mm, 11 parts of sintered corundum with the particle size of less than 0.088mm, 3 parts of silicon carbide micro powder with the particle size of less than 0.088mm, 6 parts of bauxite micro powder with 800 meshes, 7 parts of high alumina cement, 4 parts of silica fume with the particle size of less than 1 mu m, 1.5 parts of heat-resistant steel fiber, 0.1 part of organic fiber, 0.15 part of sodium hexametaphosphate and 5 parts of water.
The preparation method comprises the following steps:
s1, weighing bauxite with the particle size of more than 5mm and less than or equal to 8mm, bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, silicon carbide with the particle size of 0.088-1mm, sintered corundum with the particle size of less than 0.088mm, silicon carbide micro powder with the particle size of less than 0.088mm, bauxite micro powder with 800 meshes, high alumina cement, silica fume with the particle size of less than 1 mu m, heat-resistant steel fibers, organic fibers and sodium hexametaphosphate according to weight, and mixing for 5min to obtain a mixture;
and S2, mixing the mixture with water for 2min to obtain the product.
Example 4
An anti-skinning castable for a carbide slag cement kiln smoke chamber comprises the following raw materials in parts by weight:
40 parts of bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, 5 parts of silicon carbide with the particle size of 0.088-1mm, 15 parts of bauxite with the particle size of more than or equal to 0.088mm and less than 1mm, 5 parts of sintered corundum with the particle size of less than 0.088mm, 8 parts of silicon carbide micro powder with the particle size of less than 0.088mm, 6 parts of bauxite micro powder with 800 meshes, 8 parts of high alumina cement, 4 parts of silica fume with the particle size of less than 1 mu m, 1.5 parts of heat-resistant steel fiber, 0.1 part of organic fiber, 0.15 part of sodium hexametaphosphate and 5 parts of water.
The preparation method comprises the following steps:
s1, weighing bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, bauxite with the particle size of more than or equal to 0.088mm and less than 1mm, silicon carbide with the particle size of 0.088-1mm, sintered corundum with the particle size of less than 0.088mm, silicon carbide micro powder with the particle size of less than 0.088mm, bauxite micro powder with 800 meshes, high alumina cement, silica fume with the particle size of less than 1 mu m, heat-resistant steel fibers, organic fibers and sodium hexametaphosphate according to weight, and mixing for 4min to obtain a mixture;
and S2, mixing the mixture with water for 4min to obtain the product.
Comparative example 1
An anti-skinning castable for a carbide slag cement kiln smoke chamber comprises the following raw materials in parts by weight:
15 parts of bauxite with the particle size of more than 5mm and less than or equal to 8mm, 40 parts of bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, 18 parts of silicon carbide with the particle size of 0.088-1mm, 15 parts of fused corundum with the particle size of less than 0.088mm, 2 parts of silicon carbide micro powder with the particle size of less than 0.088mm, 2 parts of bauxite micro powder with 800 meshes, 7 parts of pure calcium aluminate cement, 4 parts of silica fume with the particle size of less than 1 mu m, 1.5 parts of heat-resistant steel fiber, 0.1 part of organic fiber, 0.15 part of sodium tripolyphosphate and 5 parts of water.
The preparation method comprises the following steps:
s1, weighing bauxite with the particle size of more than 5mm and less than or equal to 8mm, bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, silicon carbide with the particle size of 0.088-1mm, fused corundum with the particle size of less than 0.088mm, silicon carbide micro powder with the particle size of less than 0.088mm, bauxite micro powder with 800 meshes, pure calcium aluminate cement, silica fume with the particle size of less than 1 mu m, heat-resistant steel fibers, organic fibers and sodium tripolyphosphate according to weight, and mixing for 3min to obtain a mixture;
and S2, mixing the mixture with water for 3min to obtain the product.
Comparative example 2
An anti-skinning castable for a carbide slag cement kiln smoke chamber comprises the following raw materials in parts by weight:
21 parts of bauxite with the particle size of more than 5mm and less than or equal to 8mm, 34 parts of bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, 4 parts of silicon carbide with the particle size of 0.088-1mm, 15 parts of fused corundum with the particle size of less than 0.088mm, 9 parts of silicon carbide micro powder with the particle size of less than 0.088mm, 2 parts of bauxite micro powder with 800 meshes, 7 parts of pure calcium aluminate cement, 7 parts of silica fume with the particle size of less than 1 mu m, 1.5 parts of heat-resistant steel fiber, 0.1 part of organic fiber, 0.15 part of sodium tripolyphosphate and 5 parts of water.
The preparation method comprises the following steps:
s1, weighing bauxite with the particle size of more than 5mm and less than or equal to 8mm, bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, silicon carbide with the particle size of 0.088-1mm, fused corundum with the particle size of less than 0.088mm, silicon carbide micro powder with the particle size of less than 0.088mm, bauxite micro powder with 800 meshes, pure calcium aluminate cement, silica fume with the particle size of less than 1 mu m, heat-resistant steel fibers, organic fibers and sodium tripolyphosphate according to weight, and mixing for 3min to obtain a mixture;
and S2, mixing the mixture with water for 3min to obtain the product.
The formulations of examples 2 to 4 and comparative examples 1 to 2 are shown in Table 1:
table 1 examples and comparative castable formulations
Test examples
(1) Fluidity of castable
The castable materials from examples 2-4 and comparative examples 1-2 were tested for flow value according to GB/T4513.4, with the results shown in Table 2:
TABLE 2 flowability of the casting materials
| Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | |
| Flow value (mm) | 120 | 124 | 126 | 116 | 104 |
(2) Performance testing of refractory materials made from castable materials
The castable prepared in examples 2-4 and comparative examples 1-2 is subjected to forming, curing and heat treatment, and then the performance of the prepared refractory material is tested.
The test method comprises the following steps:
the breaking strength is tested according to the standard of GB/T3001-2017;
the compressive strength is tested according to the GB/T5072-2008 standard;
the line change is tested according to the GB/T5988-2007 standard;
the alkali resistance is tested according to the standard of CB/T10696-89, and the specific steps are as follows: vibrating three cubic samples on a vibrating table by using a 70.7mm multiplied by 70.7mm triple die, and reserving a cylindrical hole with the diameter of 25mm and the depth of 35mm in the center of a forming surface; demolding, maintaining and drying at 110 deg.c for 8 hr; weighing 14 g of anhydrous potassium carbonate, putting the anhydrous potassium carbonate into a cylindrical hole of a test body, and covering a cover made of the same material as the test body; feeding into an electric furnace, heating to 1100 ℃ at a certain heating rate, and keeping the temperature for 5 hours; discharging and inspecting;
abrasion resistance test method: the sample sizes were 100mm x 25mm and 114mm x 65/70mm, and the abrasive wear rate Φ was 100 x (before M-after M)/before M after the mass before and after the measurement of the sample by a sand blasting method in which SiC particles of 1 to 1.5mm were carried by a high-pressure gas flow to impact the surface of the sample. The wear resistance is 1/phi, and the wear rate phi is high, which indicates that the material has poor wear resistance.
The test results are shown in table 3:
TABLE 3 Properties of the refractory
(3) Test of slag resistance and anti-skinning performance
Preparing the casting materials of the embodiment 2 and the embodiment 3 into sample blocks with 70.7mm × 70.7.7 mm × 70.7.7 mm, reserving a hole with the diameter of 25mm 25 × 35mm in the middle, drying, and then adding 14 g of anhydrous K2CO3Adding and sealing, heating to 1150 ℃ in an electric furnace, preserving heat for 3h, and naturally cooling to test the slag resistance and the anti-skinning performance of the prepared refractory material. Wherein, the slag resistance test condition refers to GB/T8931 standard; the test condition of the anti-skinning performance is to cite an anti-skinning experimental method in the industrial standard of YB/T4193 anti-skinning castable. From the figure1. As can be seen from FIG. 2, the refractory material prepared from the castable disclosed by the invention has excellent slag resistance and anti-skinning performance.
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 (9)
1. The anti-skinning castable for the smoke chamber of the carbide slag cement kiln is characterized by comprising the following raw materials in parts by weight:
0-18 parts of bauxite with the particle size of more than 5mm and less than or equal to 8mm, 35-55 parts of bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, 0-15 parts of bauxite with the particle size of more than or equal to 0.088mm and less than or equal to 1mm, 5-15 parts of silicon carbide with the particle size of 0.088mm, 5-20 parts of corundum with the particle size of less than 0.088mm, 3-8 parts of silicon carbide micro powder, 0-6 parts of bauxite micro powder, 4-9 parts of calcium aluminate cement, 3-6 parts of silica fume, 0-3 parts of heat-resistant steel fiber, 0-0.2 part of organic fiber, 0.1-0.3 part of deflocculant and 4-5 parts of water.
2. The anti-skinning castable for carbide slag cement kiln smokestacks according to claim 1, wherein the bauxite has an alumina content > 86%.
3. The anti-skinning castable for the smoke chamber of the carbide slag cement kiln according to claim 1 or 2, wherein the fineness of the bauxite micro powder is not less than 600 meshes.
4. The anti-skinning castable for a flue chamber of a carbide slag cement kiln according to any one of claims 1 to 3, wherein the particle size of the silicon carbide micropowder is < 0.088 mm.
5. The anti-skinning castable for a flue chamber of a carbide slag cement kiln according to any one of claims 1 to 4, characterized in that the silica fume has a particle size < 1 μm.
6. The anti-skinning castable for a flue chamber of a carbide slag cement kiln according to any one of claims 1 to 5, wherein the deflocculant is at least one of sodium tripolyphosphate and sodium hexametaphosphate.
7. The anti-skinning castable material for a flue chamber of a carbide slag cement kiln according to any one of claims 1 to 6, wherein the calcium aluminate cement is at least one of pure calcium aluminate cement and high alumina cement.
8. The anti-skinning castable for carbide slag cement kiln smoke chambers according to any one of claims 1 to 7, wherein the corundum is at least one of fused corundum and sintered corundum.
9. A method for preparing an anti-skinning castable for a flue chamber of a carbide slag cement kiln according to any one of claims 1 to 8, comprising the steps of:
s1, weighing bauxite with the particle size of more than 5mm and less than or equal to 8mm, bauxite with the particle size of more than or equal to 1mm and less than or equal to 5mm, bauxite with the particle size of more than or equal to 0.088mm and less than 1mm, silicon carbide with the particle size of 0.088-1mm, corundum with the particle size of less than 0.088mm, silicon carbide micro powder, bauxite micro powder, calcium aluminate cement, silica fume, heat-resistant steel fibers, organic fibers and a deflocculant by weight, and uniformly mixing to obtain a mixture;
and S2, uniformly mixing the mixture with water to obtain the water-based paint.
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| CN114014666A (en) * | 2021-11-05 | 2022-02-08 | 洛阳理工学院 | A refractory castable for co-processing solid waste cement kiln smoke chamber |
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