CN113511906A - Low-heat-conduction energy-saving mullite kiln lining and preparation method thereof - Google Patents
Low-heat-conduction energy-saving mullite kiln lining and preparation method thereof Download PDFInfo
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- CN113511906A CN113511906A CN202110624047.5A CN202110624047A CN113511906A CN 113511906 A CN113511906 A CN 113511906A CN 202110624047 A CN202110624047 A CN 202110624047A CN 113511906 A CN113511906 A CN 113511906A
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- 229910052863 mullite Inorganic materials 0.000 title claims abstract description 101
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000002156 mixing Methods 0.000 claims description 49
- 238000000227 grinding Methods 0.000 claims description 48
- 239000000843 powder Substances 0.000 claims description 38
- 238000001035 drying Methods 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 28
- 239000011230 binding agent Substances 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 239000000654 additive Substances 0.000 claims description 18
- 230000000996 additive Effects 0.000 claims description 18
- 239000002270 dispersing agent Substances 0.000 claims description 12
- 239000003381 stabilizer Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N AI2O3 Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- SMYKVLBUSSNXMV-UHFFFAOYSA-J aluminum;tetrahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[Al+3] SMYKVLBUSSNXMV-UHFFFAOYSA-J 0.000 claims description 10
- 239000002694 phosphate binding agent Substances 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 7
- 239000007767 bonding agent Substances 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 238000004513 sizing Methods 0.000 claims description 6
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M Sodium polyacrylate Chemical group [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 5
- FWYVLGJBTZNHEM-UHFFFAOYSA-H Sodiumpolyphosphate Chemical group [Na+].[O-]P(=O)=O.[O-]P(=O)=O.[O-]P(=O)=O.[O-]P(=O)=O.[O-]P(=O)=O.[O-]P(=O)=O FWYVLGJBTZNHEM-UHFFFAOYSA-H 0.000 claims description 5
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 5
- 235000019830 sodium polyphosphate Nutrition 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims 1
- 239000011819 refractory material Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 18
- 238000005265 energy consumption Methods 0.000 description 6
- 239000011796 hollow space material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000000903 blocking Effects 0.000 description 5
- 238000005485 electric heating Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000630 rising Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N Silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000012245 magnesium oxide Nutrition 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000003756 stirring Methods 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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/10—Monolithic linings; Supports therefor
-
- 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
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
-
- 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
-
- 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
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- 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
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/0003—Linings or walls
- F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
- F27D1/0009—Comprising ceramic fibre elements
Abstract
The invention relates to the technical field of refractory materials, in particular to a low-heat-conduction energy-saving mullite kiln lining and a preparation method thereof.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a low-heat-conduction energy-saving mullite kiln lining and a preparation method thereof.
Background
The mullite product is widely applied to a plurality of fields such as cement and the like by the characteristics of high purity, high temperature resistance, high strength and the like, and is used for preparing equipment such as a cement kiln and the like.
The existing cement kiln lining is periclase spinel and silicon carbide-containing material. Due to the influence of materials and formulas, the heat conductivity coefficient of the material is usually 2.8-3.5W/m.k, the heat loss in a large kiln is easily caused due to the over-high heat conduction, and the red kiln is generated due to the oxidation, thinning and deformation of a cylinder body.
Disclosure of Invention
Aiming at the problems, the invention provides a low-heat-conduction energy-saving mullite kiln lining and a preparation method thereof.
The adopted technical scheme is that the low-heat-conduction energy-saving mullite kiln lining comprises the following components of mullite, a mullite closed hollow pore-increasing material, a micro powder additive, a bonding agent, a dispersing agent and a stabilizing agent.
Further, by weight, 60-70 parts of mullite, 5-15 parts of a mullite closed hollow pore-increasing material and a micro powder additive, 15-20 parts of a bonding agent, and 0.8-3 parts of a dispersing agent and a stabilizing agent.
Optionally, the mullite comprises 8-5 mm fused mullite, 5-3 mm fused mullite, 3-1 mm fused mullite and 1-0.074 mm fused mullite.
Optionally, the proportion of 8-5 mm fused mullite in the mullite is 10% -30%, the proportion of 5-3 mm fused mullite is 20% -40%, the proportion of 3-1 mm fused mullite is 20% -40%, and the proportion of 1-0.074 mm fused mullite is 10% -30%.
Optionally, the mullite closed hollow pore-increasing material is a hollow mullite sphere.
Further, the micro powder additive is silicon dioxide micro powder and alumina micro powder, and the ratio of the silicon dioxide micro powder to the alumina micro powder is 4: 6.
Optionally, the ratio of the mullite closed hollow pore-increasing material to the micro powder additive is 1: 2-3.
Further, the binding agent comprises an aluminate binding agent and a phosphate binding agent, and the ratio of the aluminate binding agent to the phosphate binding agent is 1: 2-5.
Optionally, the dispersing agent is sodium polyacrylate, the stabilizer is sodium polyphosphate, and the ratio of the dispersing agent to the stabilizer is 0.5-2: 1.
Meanwhile, the application also provides a preparation method of the low-heat-conduction energy-saving mullite kiln lining, which comprises the following steps:
s1, coarse mixing and grinding, namely putting mullite and a mullite closed hollow pore-increasing material into a mixing and grinding machine, and adding deionized water to perform coarse mixing and grinding;
s2, re-mixing and grinding, namely adding the micro powder additive, the bonding agent, the dispersing agent and the stabilizing agent into the mixture obtained by coarse mixing and grinding, and performing re-mixing and grinding to obtain pug;
s3, forming, namely placing the pug obtained by mixing and grinding into a forming machine for forming to obtain a primary kiln lining body after sizing forming;
s4, drying, namely putting the obtained kiln lining body with the fixed size after forming into a dryer for low-temperature drying to obtain a dried primary kiln body;
and S5, drying, namely drying the dried primary kiln lining body in an electric control heating mode according to a fixed temperature rise method to obtain the finished-grade low-heat-conduction energy-saving mullite kiln lining.
The beneficial effects of the invention at least comprise one of the following;
1. the material density can be reduced by using the mullite closed hollow pore-increasing material, so that a low heat-conducting density body can be obtained, and meanwhile, the hollow material body can be utilized to block or greatly reduce the heat transfer efficiency.
2. The refractoriness of the whole kiln lining is greatly improved, and the integral heat conductivity is reduced.
3. The sintering-free process manufacturing is realized in the production process through the adjustment of the formula, the problems of heat loss and red kiln caused by overhigh heat conductivity can be avoided, high-energy-consumption and high-pollution high-temperature sintering equipment such as a tunnel kiln is not required to be used in the preparation of the mullite kiln liner, and the green manufacturing is realized.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the examples of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention.
Thus, the following detailed description of embodiments of the invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Example 1
A preparation method of a low-heat-conduction energy-saving mullite kiln lining comprises the following steps:
s1, coarse mixing and grinding, namely putting 60 parts of mullite and 2 parts of mullite closed hollow pore-increasing material into a mixing and grinding machine, and adding deionized water to perform coarse mixing and grinding;
s2, re-mixing and grinding, namely adding 4 parts of micro powder additive, 15 parts of binding agent, 0.6 part of dispersing agent and 0.3 part of stabilizing agent into the mixture obtained by coarse mixing and grinding, and performing re-mixing and grinding to obtain pug;
s3, forming, namely placing the pug obtained by mixing and grinding into a forming machine for forming to obtain a primary kiln lining body after sizing forming;
s4, drying, namely putting the obtained kiln lining body with the fixed size after forming into a dryer for low-temperature drying to obtain a dried primary kiln body;
and S5, drying, namely drying the dried primary kiln lining body in an electric control heating mode according to a fixed temperature rise method to obtain the finished-grade low-heat-conduction energy-saving mullite kiln lining.
The aim of the design is to reduce the material density by using the mullite closed hollow pore-increasing material, thereby obtaining a low heat conduction density body, and simultaneously blocking or greatly reducing the heat transfer efficiency by using the hollow material body. The refractoriness of the whole kiln lining is greatly improved, and the integral heat conductivity is reduced. The sintering-free process manufacturing is realized in the production process through the adjustment of the formula, the problem of 'red kiln' caused by overhigh heat conductivity can be avoided, and meanwhile, high-energy-consumption and high-pollution equipment such as a tunnel kiln is not needed to be used in the preparation of the mullite kiln liner, so that the green manufacturing is realized.
Example 2
A preparation method of a low-heat-conduction energy-saving mullite kiln lining comprises the following steps:
s1, coarse mixing and grinding, namely putting 70 parts of mullite and 10 parts of mullite closed hollow pore-increasing material into a mixing and grinding machine, and adding deionized water to perform coarse mixing and grinding;
s2, re-mixing and grinding, namely adding 10 parts of micro powder additive, 20 parts of binding agent, 2 parts of dispersing agent and 1 part of stabilizing agent into the mixture obtained by coarse mixing and grinding, and re-mixing and grinding to obtain pug;
s3, forming, namely placing the pug obtained by mixing and grinding into a forming machine for forming to obtain a lining body of the sizing kiln;
s4, drying, namely putting the obtained kiln lining body with the fixed size into a dryer for low-temperature drying to obtain a dried kiln lining body;
and S5, drying, namely drying the dried kiln lining body in a fixed temperature rising mode in an electric heating mode to obtain the mullite kiln lining.
The aim of the design is to reduce the material density by using the mullite closed hollow pore-increasing material, thereby obtaining a low heat conduction density body, and simultaneously blocking or greatly reducing the heat transfer efficiency by using the hollow material body. The refractoriness of the whole kiln lining is greatly improved, and the integral heat conductivity is reduced. The sintering-free process manufacturing is realized in the production process through the adjustment of the formula, the problem of 'red kiln' caused by overhigh heat conductivity can be avoided, and meanwhile, high-energy-consumption and high-pollution high-temperature sintering equipment such as a tunnel kiln is not required to be used in the preparation of the mullite kiln liner, so that the green manufacturing is realized.
Example 3
A preparation method of a low-heat-conduction energy-saving mullite kiln lining comprises the following steps:
s1, coarse mixing and grinding, namely putting 70 parts of mullite and 5 parts of hollow mullite spheres into a mixing and grinding machine, and adding deionized water to perform coarse mixing and grinding, wherein the mullite comprises 10% of 8-5 mm fused mullite, 40% of 5-3 mm fused mullite, 40% of 3-1 mm fused mullite and 10% of 1-0.074 mm fused mullite;
s2, re-mixing and grinding, namely adding 10 parts of micro powder additive, 20 parts of binding agent, 2 parts of sodium polyacrylate and 1 part of sodium polyphosphate into the mixture obtained by coarse mixing and grinding, and performing re-mixing and grinding to obtain pug, wherein the micro powder additive comprises silica micro powder and alumina micro powder, the ratio of the silica micro powder to the alumina micro powder is 4:6, the binding agent comprises aluminate binding agent and phosphate binding agent, and the ratio of the aluminate binding agent to the phosphate binding agent is 1: 2;
s3, forming, namely placing the pug obtained by mixing and grinding into a forming machine for forming to obtain a lining body of the sizing kiln;
s4, drying, namely putting the obtained fixed-length kiln lining body into a dryer for low-temperature drying to obtain a dried primary kiln lining body;
and S5, drying, namely drying the dried kiln lining body in a fixed temperature rising mode through an electric heating mode to obtain the finished-product-grade mullite kiln lining.
The aim of the design is to reduce the material density by using the mullite closed hollow pore-increasing material, thereby obtaining a low heat conduction density body, and simultaneously blocking or greatly reducing the heat transfer efficiency by using the hollow material body. The refractoriness of the whole kiln lining is greatly improved, and the integral heat conductivity is reduced. The sintering-free process manufacturing is realized in the production process through the adjustment of the formula, the problem of 'red kiln' caused by overhigh heat conductivity can be avoided, and meanwhile, high-energy-consumption and high-pollution equipment such as a tunnel kiln is not needed to be used in the preparation of the mullite kiln liner, so that the green manufacturing is realized.
The test result is as follows:
the refractoriness is more than 1780 ℃;
bulk density 1.5g/cm3；
Thermal shock stability (1100 ℃, water cooling) for 20 times;
thermal conductivity (850 ℃ C. by laser method) 0.75W/m.k;
the cold fracture strength is 6 MPa;
cold compressive strength 40 MPa;
example 4
A preparation method of a low-heat-conduction energy-saving mullite kiln lining comprises the following steps:
s1, coarse mixing and grinding, namely putting 70 parts of mullite and 5 parts of hollow mullite spheres into a mixing and grinding machine, and adding deionized water to perform coarse mixing and grinding, wherein the mullite comprises 30% of 8-5 mm fused mullite, 20% of 5-3 mm fused mullite, 20% of 3-1 mm fused mullite and 30% of 1-0.074 mm fused mullite;
s2, re-mixing and grinding, namely adding 10 parts of micro powder additive, 20 parts of binding agent, 2 parts of sodium polyacrylate and 1 part of sodium polyphosphate into the mixture obtained by coarse mixing and grinding, and performing re-mixing and grinding to obtain pug, wherein the micro powder additive comprises silica micro powder and alumina micro powder, the ratio of the silica micro powder to the alumina micro powder is 4:6, the binding agent comprises aluminate binding agent and phosphate binding agent, and the ratio of the aluminate binding agent to the phosphate binding agent is 1: 2;
s3, forming, namely placing the pug obtained by mixing and grinding into a forming machine for forming to obtain a lining body of the sizing kiln;
s4, drying, namely putting the obtained fixed-length kiln lining body into a drying box for low-temperature drying to obtain a dried kiln lining body;
and S5, drying, namely drying the dried kiln lining body in an electric heating mode according to a fixed temperature rise method to obtain the finished-product mullite kiln lining.
The aim of the design is to reduce the material density by using the mullite closed hollow pore-increasing material, thereby obtaining a low heat conduction density body, and simultaneously blocking or greatly reducing the heat transfer efficiency by using the hollow material body. The refractoriness of the whole kiln lining is greatly improved, and the integral heat conductivity is reduced. The sintering-free process manufacturing is realized in the production process through the adjustment of the formula, the problem of 'red kiln' caused by overhigh heat conductivity can be avoided, and meanwhile, high-energy-consumption and high-pollution equipment such as a tunnel kiln is not needed to be used in the preparation of the mullite kiln liner, so that the green manufacturing is realized.
The test result is as follows:
the refractoriness is more than 1780 ℃;
bulk density 1.8g/cm3；
Thermal shock stability (1100 ℃, water cooling) is more than 35 times;
thermal conductivity (850 ℃ C. by laser method) of 1.0W/m.k;
the cold fracture strength is 9 MPa;
cold compression strength is 70 Mpa;
example 5
A preparation method of a low-heat-conduction energy-saving mullite kiln lining comprises the following steps:
s1, coarse mixing and grinding, namely putting 65 parts of mullite and 4 parts of hollow mullite spheres into a mixing and grinding machine, and adding deionized water to perform coarse mixing and grinding, wherein the mullite comprises 30% of 8-5 mm fused mullite, 20% of 5-3 mm fused mullite, 20% of 3-1 mm fused mullite and 30% of 1-0.074 mm fused mullite;
s2, re-mixing and grinding, namely adding 8 parts of micro powder additive, 17 parts of binding agent, 0.4 part of sodium polyacrylate and 0.7 part of sodium polyphosphate into the mixture obtained by coarse mixing and grinding, and performing re-mixing and grinding to obtain mud 1, wherein the micro powder additive is silicon dioxide micro powder and alumina micro powder, the ratio of the silicon dioxide micro powder to the alumina micro powder is 4:6, the binding agent comprises aluminate binding agent and phosphate binding agent, and the ratio of the aluminate binding agent to the phosphate binding agent is 1: 2;
s2', adding water with the pH value of 7-7.2, mixing and stirring to obtain pug 2;
s3, forming, namely placing the pug 2 into a forming machine for forming to obtain a fixed-length kiln lining;
s4, drying, namely putting the obtained fixed-length kiln lining into a drying box for low-temperature drying to obtain a dried primary kiln lining;
and S5, drying, namely drying the dried kiln lining in an electric heating mode according to a fixed temperature rising mode to obtain the finished-product-grade mullite kiln lining.
The aim of the design is to reduce the material density by using the mullite closed hollow pore-increasing material, thereby obtaining a low heat conduction density body, and simultaneously blocking or greatly reducing the heat transfer efficiency by using the hollow material body. The refractoriness of the whole kiln lining is greatly improved, and the integral heat conductivity is reduced. The sintering-free process manufacturing is realized in the production process through the adjustment of the formula, the problem of 'red kiln' caused by overhigh heat conductivity can be avoided, and meanwhile, high-energy-consumption and high-pollution equipment such as a tunnel kiln is not needed to be used in the preparation of the mullite kiln liner, so that the green manufacturing is realized.
The test result is as follows:
the refractoriness is more than 1780 ℃;
bulk density 1.9g/cm3；
Thermal shock stability (1100 ℃, water cooling) is more than 35 times;
thermal conductivity (850 ℃ C. by laser method) 0.8W/m.k;
the cold fracture strength is 10 MPa;
the cold compression strength is 90 Mpa;
although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (10)
1. The low-heat-conduction energy-saving mullite kiln lining is characterized in that: comprises the following components of mullite, a mullite closed hollow pore-increasing material, a micro powder additive, a bonding agent, a dispersing agent and a stabilizing agent.
2. The low-heat-conduction energy-saving mullite kiln liner as claimed in claim 1, wherein: the mullite composite material comprises, by weight, 60-70 parts of mullite, 5-15 parts of a mullite closed hollow pore-increasing material and a micro powder additive, 15-20 parts of a bonding agent, and 0.8-3 parts of a dispersing agent and a stabilizing agent.
3. The low-heat-conduction energy-saving mullite kiln liner as claimed in claim 2, wherein: the mullite comprises 8-5 mm fused mullite, 5-3 mm fused mullite, 3-1 mm fused mullite and 1-0.074 mm fused mullite.
4. The low-heat-conduction energy-saving mullite kiln liner as claimed in claim 3, wherein: the mullite consists of 10-30% of 8-5 mm fused mullite, 20-40% of 5-3 mm fused mullite, 20-40% of 3-1 mm fused mullite and 10-30% of 1-0.074 mm fused mullite.
5. Name as claimed in claim 4, characterized in that: the mullite closed hollow pore-increasing material is a hollow mullite sphere.
6. Name as claimed in claim 5, characterized in that: the micro powder additive is silicon dioxide micro powder and alumina micro powder, and the ratio of the silicon dioxide micro powder to the alumina micro powder is 4: 6.
7. The name of claim 6, wherein: the ratio of the mullite closed hollow pore-increasing material to the micro powder additive is 1: 2-3.
8. The name of claim 7, wherein: the binding agent comprises an aluminate binding agent and a phosphate binding agent, and the ratio of the aluminate binding agent to the phosphate binding agent is 1: 2-5.
9. The name of claim 8, wherein: the dispersing agent is sodium polyacrylate, the stabilizer is sodium polyphosphate, and the ratio of the dispersing agent to the stabilizer is 0.5-2: 1.
10. A preparation method of a low-heat-conduction energy-saving mullite kiln lining is characterized by comprising the following steps: the method comprises the following steps:
s1, coarse mixing and grinding, namely putting mullite and a mullite closed hollow pore-increasing material into a mixing and grinding machine, and adding deionized water to perform coarse mixing and grinding;
s2, re-mixing and grinding, namely adding the micro powder additive, the bonding agent, the dispersing agent and the stabilizing agent into the mixed material obtained by coarse mixing and grinding, and performing re-mixing and grinding to obtain pug;
s3, forming, namely placing the pug obtained by mixing and grinding into a forming machine for forming to obtain a primary kiln lining body after sizing forming;
s4, drying, namely putting the obtained kiln lining body with the fixed size after forming into a dryer for low-temperature drying to obtain a dried primary kiln body;
and S5, drying, namely drying the dried primary kiln lining body in an electric control heating mode according to a fixed temperature rise method to obtain the finished-grade low-heat-conduction energy-saving mullite kiln lining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110624047.5A CN113511906A (en) | 2021-06-04 | 2021-06-04 | Low-heat-conduction energy-saving mullite kiln lining and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110624047.5A CN113511906A (en) | 2021-06-04 | 2021-06-04 | Low-heat-conduction energy-saving mullite kiln lining and preparation method thereof |
Publications (1)
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| CN110256090A (en) * | 2019-06-24 | 2019-09-20 | 武汉钢铁有限公司 | A kind of tundish permanent layer lightweight insulated pouring material |
| CN110526724A (en) * | 2019-09-19 | 2019-12-03 | 巩义市富华耐材有限公司 | A kind of needle coke inner liner of rotary kiln new high-tech material and preparation method thereof |
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| JP2009263145A (en) * | 2008-04-22 | 2009-11-12 | Agc Ceramics Co Ltd | Powder composition for insulating castable having low thermal conductivity |
| CN103755363A (en) * | 2013-12-27 | 2014-04-30 | 郑州汇特耐火材料有限公司 | Lightweight siliceous mullite composite brick and preparation method thereof |
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