CN114671673A - Corrosion-resistant light-weight refractory material and preparation method thereof - Google Patents
Corrosion-resistant light-weight refractory material and preparation method thereof Download PDFInfo
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- 239000011819 refractory material Substances 0.000 title claims abstract description 48
- 230000007797 corrosion Effects 0.000 title claims abstract description 14
- 238000005260 corrosion Methods 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 48
- 239000010431 corundum Substances 0.000 claims abstract description 48
- 230000003628 erosive effect Effects 0.000 claims abstract description 35
- 239000004568 cement Substances 0.000 claims abstract description 28
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 24
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 21
- 239000010439 graphite Substances 0.000 claims abstract description 21
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 21
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 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 9
- 238000005245 sintering Methods 0.000 claims abstract description 8
- 239000011261 inert gas Substances 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims abstract description 6
- 238000001723 curing Methods 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 40
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 35
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical group [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000002585 base Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 9
- 239000011148 porous material Substances 0.000 description 9
- 239000003513 alkali Substances 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 6
- 229910052596 spinel Inorganic materials 0.000 description 4
- 239000011029 spinel Substances 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- DJOYTAUERRJRAT-UHFFFAOYSA-N 2-(n-methyl-4-nitroanilino)acetonitrile Chemical compound N#CCN(C)C1=CC=C([N+]([O-])=O)C=C1 DJOYTAUERRJRAT-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000035939 shock Effects 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
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 239000002918 waste heat 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
- C04B35/106—Refractories from grain sized mixtures containing zirconium oxide or zircon (ZrSiO4)
-
- 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
-
- 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
-
- 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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
- C04B2235/425—Graphite
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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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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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
- 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
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
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- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Chemistry (AREA)
Abstract
The invention discloses an erosion-resistant light-weight refractory material which comprises the following raw materials in parts by weight: 40 parts of base material, 54-56 parts of corundum aggregate and 4-6 parts of cement; wherein the base material is a mixture of magnesium oxide, graphite, aluminum oxide and zirconium dioxide. The invention also discloses a preparation method of the erosion-resistant lightweight refractory material, which comprises the following steps: uniformly mixing the base material, the corundum aggregate and the cement slurry, casting, curing, heating and drying, then heating to 1500-1550 ℃ in an inert gas atmosphere, and then introducing air for sintering for 5-6h to obtain the corrosion-resistant lightweight refractory material. The invention has good erosion resistance and mechanical property.
Description
Technical Field
The invention relates to the technical field of cement kiln materials, in particular to an erosion-resistant light-weight refractory material and a preparation method thereof.
Background
The light-weight refractory material is prepared by introducing more air holes on the basis of the traditional refractory material, and can achieve the purposes of heat preservation, heat insulation, energy conservation and consumption reduction by reducing the heat capacity and the heat conductivity coefficient of the refractory material. The method is suitable for a mode that the novel dry-method cement kiln preheats raw materials by adopting waste heat.
The novel dry-method cement rotary kiln has the advantages of large volume, high calcining temperature, large heat capacity and long material retention time, and technically has the capacity of realizing harmless, recycling, reduction and safety treatment of industrial wastes and household garbage. At present, wastes and household garbage are adopted as alternative fuels and widely applied to the modern cement industry, and remarkable economic and social benefits are obtained.
However, the use of waste and domestic garbage as alternative fuels can lead to the enrichment and circulation of alkali, sulfur, chlorine and other substances in the kiln body, aggravate the corrosion and damage of the lightweight refractory material, reduce the service life of the lightweight refractory material, and need to improve the performance of the lightweight refractory material.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides an erosion-resistant lightweight refractory material and a preparation method thereof.
The invention provides an erosion-resistant light-weight refractory material which comprises the following raw materials in parts by weight: 40 parts of base material, 54-56 parts of corundum aggregate and 4-6 parts of cement; wherein the base material is a mixture of magnesium oxide, graphite, aluminum oxide and zirconium dioxide.
Magnesium oxide and graphite are selected to react at high temperature in an oxygen-free environment to generate Mg vapor and carbon monoxide to form pores; then Mg vapor reacts with oxygen on the surface of the refractory material and permeated into the surface layer to form MgO, and forms spinel with alumina, so that closed pores are formed on the surface of the refractory material and pores on the surface layer, the apparent porosity is reduced, and the erosion resistance is improved; the added zirconium dioxide can react with cement to generate calcium zirconate, and can be attached to the surface of a refractory material at the high temperature of about 1500 ℃, so that the apparent porosity is reduced, and the erosion resistance is improved.
Preferably, the weight ratio of the total weight of the magnesium oxide and the graphite to the weight of the aluminum oxide in the base material is 1: 2.5-3.
Preferably, the alumina in the base material consists of alumina with the grain diameter of 10-50 μm and nano alumina.
Preferably, the nano alumina is used in an amount of 1.9-2 wt% based on the total weight of the raw materials.
The proper amount of nano alumina is added into the base material, and because the specific surface area is large and the reaction activity is high, the speed of forming spinel on the surface layer of the refractory material by magnesium vapor and alumina is accelerated, more closed pores are preserved in the material, and the apparent porosity is reduced, so that the heat preservation performance and the erosion resistance are improved; in addition, the nano-alumina can promote the internal pores to be micronized, and enhance the sintering strength among particles, thereby improving the fracture resistance and the thermal shock resistance.
Preferably, the amount of zirconium dioxide is 1-2.8 wt% based on the total weight of the raw materials.
The proper proportion of the total weight of the magnesium oxide and the graphite, the aluminum oxide and the zirconium dioxide can avoid excessive air holes from generating to influence the mechanical property of the refractory material; and the addition amount of the zirconium dioxide is controlled within a proper range, so that the problems of cost improvement and mechanical property reduction caused by excessive zirconium dioxide can be solved.
Preferably, the corundum aggregate is composed of corundum with the grain diameter of 3-5mm, corundum with the grain diameter of 1-3mm and corundum with the grain diameter of less than 1 mm.
Preferably, the weight ratio of the corundum with the grain diameter of 3-5mm to the corundum with the grain diameter of 1-3mm to the corundum with the grain diameter of less than 1mm is 1-1.5:1: 1-1.5.
The corundum aggregates with different grain diameters are selected to be matched with each other, so that the mechanical property of the refractory material can be improved.
Preferably, the moles of magnesium oxide and graphite are the same.
Preferably, the cement is a calcium aluminate cement.
The erosion-resistant lightweight refractory material may further contain an auxiliary agent such as a dispersant, and the dispersant may be sodium tripolyphosphate, sodium hexametaphosphate, or a dispersant FS 10.
The invention also provides a preparation method of the erosion-resistant lightweight refractory material, which comprises the following steps: and uniformly mixing the base material, the corundum aggregate and the cement slurry, casting, curing, heating and drying, then heating to 1500 ℃ in an inert gas atmosphere, and then introducing air for sintering for 5-6h to obtain the corrosion-resistant lightweight refractory material.
The inert gas may be nitrogen, argon, or the like.
Has the advantages that:
1. the invention can keep the good mechanical property of the refractory material by selecting proper proportion of the raw materials, so that the refractory material can be suitable for the cement kiln;
2. selecting magnesium oxide and graphite to react at high temperature in an oxygen-free environment to generate Mg steam and carbon monoxide, and forming air holes in the refractory material; then Mg vapor reacts with oxygen to form MgO, and the MgO and alumina form spinel, so that closed pores are formed in pores on the surface of the refractory material, the apparent porosity is reduced, and the erosion resistance is improved;
3. the proper amount of nano alumina is added into the base material, and because the specific surface area is large and the reaction activity is high, the speed of forming spinel on the surface layer of the refractory material by magnesium vapor and alumina is accelerated, more closed pores are preserved in the material, the apparent porosity is reduced, and the heat preservation performance and the erosion resistance are improved; in addition, the nano-alumina can promote the internal pores to be micronized, and enhance the sintering strength among particles, thereby improving the mechanical properties such as fracture resistance and the like;
4. the added zirconium dioxide can react with cement to generate calcium zirconate, which can be attached to the surface of the refractory material at the high temperature of about 1500 ℃, thereby reducing the apparent porosity, preventing the infiltration and the corrosion of harmful components, improving the erosion resistance and avoiding the reduction of the mechanical property caused by the excessive zirconium dioxide.
Detailed Description
Hereinafter, the technical solution of the present invention will be described in detail by specific examples, but these examples should be explicitly proposed for illustration, but should not be construed as limiting the scope of the present invention.
Example 1
An erosion-resistant light-weight refractory material comprises the following raw materials in parts by weight: 8.44g of magnesium oxide, 2.56g of graphite, 26g of alumina with the particle size of 10-50 mu m, 2g of nano alumina, 1g of zirconium dioxide, 18g of corundum with the particle size of 3-5mm, 18g of corundum with the particle size of 1-3mm, 18g of corundum with the particle size of less than 1mm and 6g of calcium aluminate cement.
The preparation method of the erosion-resistant lightweight refractory material comprises the following steps: uniformly milling magnesium oxide, graphite, aluminum oxide with the particle size of 10-50 mu m, nano aluminum oxide and zirconium dioxide to obtain a base material; uniformly mixing corundum and cement slurry with various particle sizes, adding a base material, uniformly mixing, casting and molding, curing at room temperature for 48 hours, demolding, heating and drying at 110 ℃, then heating to 1500 ℃ in an inert gas atmosphere, and introducing air for sintering for 6 hours to obtain the corrosion-resistant lightweight refractory material.
Example 2
An erosion-resistant light-weight refractory material comprises the following raw materials in parts by weight: 7.15g of magnesium oxide, 2.15g of graphite, 26g of alumina with the grain diameter of 10-50 mu m, 1.9g of nano alumina, 2.8g of zirconium dioxide, 21g of corundum with the grain diameter of 3-5mm, 14g of corundum with the grain diameter of 1-3mm, 21g of corundum with the grain diameter of less than 1mm and 4g of calcium aluminate cement.
The preparation method of the erosion-resistant lightweight refractory material comprises the following steps: uniformly milling magnesium oxide, graphite, aluminum oxide with the particle size of 10-50 mu m, nano aluminum oxide and zirconium dioxide to obtain a base material; uniformly mixing corundum and cement slurry with various particle sizes, adding a base material, uniformly mixing, casting and molding, maintaining at room temperature for 48 hours, demolding, heating and drying at 110 ℃, then heating to 1550 ℃ in an inert gas atmosphere, and introducing air for sintering for 5 hours to obtain the corrosion-resistant lightweight refractory material.
Example 3
An erosion-resistant light-weight refractory material comprises the following raw materials in parts by weight: 7.7g of magnesium oxide, 2.3g of graphite, 26g of alumina with the particle size of 10-50 mu m, 2g of nano alumina, 2g of zirconium dioxide, 20g of corundum with the particle size of 3-5mm, 16g of corundum with the particle size of 1-3mm, 19g of corundum with the particle size of less than 1mm and 5g of calcium aluminate cement.
The preparation method of the erosion-resistant lightweight refractory material comprises the following steps: uniformly milling magnesium oxide, graphite, aluminum oxide with the particle size of 10-50 mu m, nano aluminum oxide and zirconium dioxide to obtain a base material; uniformly mixing corundum and cement slurry with various particle sizes, adding a base material, uniformly mixing, casting and molding, curing at room temperature for 48 hours, demolding, heating and drying at 110 ℃, then heating to 1520 ℃ in an inert gas atmosphere, and introducing air for sintering for 5.5 hours to obtain the corrosion-resistant lightweight refractory material.
Comparative example 1
An erosion-resistant light-weight refractory material comprises the following raw materials in parts by weight: 7.7g of magnesium oxide, 2.3g of graphite, 28g of alumina with the particle size of 10-50 mu m, 2g of zirconium dioxide, 20g of corundum with the particle size of 3-5mm, 16g of corundum with the particle size of 1-3mm, 19g of corundum with the particle size of less than 1mm and 5g of calcium aluminate cement.
The preparation method is the same as example 3.
Comparative example 2
An erosion-resistant lightweight refractory material comprises the following raw materials in parts by weight: 7.7g of magnesium oxide, 2.3g of graphite, 23g of alumina with the particle size of 10-50 mu m, 5g of nano alumina, 2g of zirconium dioxide, 20g of corundum with the particle size of 3-5mm, 16g of corundum with the particle size of 1-3mm, 19g of corundum with the particle size of less than 1mm and 5g of calcium aluminate cement.
The preparation method is the same as example 3.
Comparative example 3
An erosion-resistant light-weight refractory material comprises the following raw materials in parts by weight: 7.7g of magnesium oxide, 2.3g of graphite, 28g of alumina with the particle size of 10-50 mu m, 2g of nano alumina, 20g of corundum with the particle size of 3-5mm, 16g of corundum with the particle size of 1-3mm, 19g of corundum with the particle size of less than 1mm and 5g of calcium aluminate cement.
The preparation method is the same as example 3.
Comparative example 4
An erosion-resistant light-weight refractory material comprises the following raw materials in parts by weight: 7.7g of magnesium oxide, 2.3g of graphite, 23g of alumina with the particle size of 10-50 mu m, 2g of nano alumina, 5g of zirconium dioxide, 20g of corundum with the particle size of 3-5mm, 16g of corundum with the particle size of 1-3mm, 19g of corundum with the particle size of less than 1mm and 5g of calcium aluminate cement.
The preparation method is the same as example 3.
Comparative example 5
An erosion-resistant light-weight refractory material comprises the following raw materials in parts by weight: 7.7g of magnesium oxide, 2.3g of graphite, 30g of alumina with the particle size of 10-50 mu m, 20g of corundum with the particle size of 3-5mm, 16g of corundum with the particle size of 1-3mm, 19g of corundum with the particle size less than 1mm and 5g of calcium aluminate cement.
The preparation method is the same as example 3.
The refractory materials obtained in examples 1 to 3 and comparative examples 1 to 6 were subjected to the performance test, and the results are shown in Table 1.
Detecting apparent porosity and volume density by referring to GB/T2997-2015; detecting the normal-temperature compressive strength of the sample by referring to GB/T5072-2008; detecting the normal-temperature rupture strength of the sample by referring to GB/T3001-2007; detecting the high-temperature rupture strength of the sample by referring to GB/T3002-2004; and (3) detecting the alkali resistance of the sample by referring to GB/T14983-2008.
TABLE 1 test results
Remarking: the apparent porosity and the volume density are detected by sintered samples.
From examples 1 to 3, it can be seen that the present invention has a low density, a low apparent porosity, a good alkali corrosion resistance, and a high compressive strength and rupture strength; it can be seen from example 3 and comparative examples 1-2 that the alkali corrosion resistance and mechanical properties of the refractory are reduced when nano alumina is not added or is added excessively; it can be seen from example 3 and comparative examples 3 to 4 that the alkali corrosion resistance and mechanical properties of the refractory are lowered without or with excessive addition of zirconium dioxide; as can be seen from example 3 and comparative example 5, proper amounts of nano alumina and zirconia are matched with each other, so that the alkali corrosion resistance and the mechanical property of the invention can be improved.
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 (10)
1. An erosion-resistant lightweight refractory material is characterized by comprising the following raw materials in parts by weight: 40 parts of base material, 54-56 parts of corundum aggregate and 4-6 parts of cement; wherein the base material is a mixture of magnesium oxide, graphite, aluminum oxide and zirconium dioxide.
2. The erosion-resistant lightweight refractory of claim 1 wherein the weight ratio of the combined weight of magnesium oxide and graphite to aluminum oxide in the binder is 1:2.5 to 3.
3. The erosion-resistant lightweight refractory according to claim 1 or 2, wherein the alumina in the binder consists of alumina having a particle size of 10 to 50 μm and nano alumina.
4. The erosion-resistant lightweight refractory according to claim 3, wherein the amount of nano alumina is 1.9 to 2 wt% based on the total weight of the raw materials.
5. Erosion-resistant lightweight refractory according to any one of claims 1 to 4, characterized in that zirconium dioxide is used in an amount of 1 to 2.8 wt.% based on the total weight of the raw materials.
6. Erosion-resistant lightweight refractory according to any of claims 1 to 5, characterized in that the corundum aggregate consists of corundum with a particle size of 3 to 5mm, corundum with a particle size of 1 to 3mm, corundum with a particle size < 1 mm.
7. The erosion-resistant lightweight refractory according to claim 6, wherein the weight ratio of corundum having a grain size of 3 to 5mm, corundum having a grain size of 1 to 3mm, and corundum having a grain size of < 1mm is 1 to 1.5:1:1 to 1.5.
8. The erosion-resistant, lightweight refractory material of any one of claims 1 to 7, wherein the magnesium oxide and graphite are present in the same molar amount.
9. Erosion-resistant lightweight refractory according to any of the claims 1 to 8, characterized in that the cement is calcium aluminate cement.
10. A method of making an erosion resistant lightweight refractory material according to any one of claims 1 to 9, comprising the steps of: and uniformly mixing the base material, the corundum aggregate and the cement slurry, casting, curing, heating and drying, then heating to 1500 ℃ in an inert gas atmosphere, and then introducing air for sintering for 5-6h to obtain the corrosion-resistant lightweight refractory material.
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