CN108424129B - Heat-insulating wear-resistant refractory castable and preparation method thereof - Google Patents

Heat-insulating wear-resistant refractory castable and preparation method thereof Download PDF

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Publication number
CN108424129B
CN108424129B CN201810393804.0A CN201810393804A CN108424129B CN 108424129 B CN108424129 B CN 108424129B CN 201810393804 A CN201810393804 A CN 201810393804A CN 108424129 B CN108424129 B CN 108424129B
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heat
resistant
insulating wear
preparation
castable
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CN108424129A (en
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张寒
赵惠忠
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Gongyi Xingping Refractory Materials Co ltd
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Wuhan University of Science and Engineering WUSE
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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
    • C04B2235/34—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
    • C04B2235/34—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
    • C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
    • 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

Abstract

The invention relates to a heat-insulating wear-resistant refractory castable and a preparation method thereof. The technical scheme is that: 60-65 wt% of bauxite chamotte and 5-8 wt% of fused quartz sand are used as aggregate, 20-25 wt% of ferrotitanium slag, 3-5 wt% of bentonite and 5-8 wt% of rho-Al2O3The micro powder is used as a base material; uniformly mixing the matrix material, adding the uniformly mixed matrix material into the aggregate, and uniformly mixing to obtain a mixture; and then adding water accounting for 5.5-6.0 wt% of the mixture into the mixture, uniformly stirring, and ageing for 0.4-0.5 h at room temperature to prepare the heat-insulating wear-resistant castable refractory. The invention has the characteristics of low cost and simple process; the prepared heat-insulating wear-resistant refractory castable has small heat conductivity coefficient, strong wear resistance and good fluidity.

Description

Heat-insulating wear-resistant refractory castable and preparation method thereof
Technical Field
The invention belongs to the technical field of refractory castable. In particular to a heat-insulating wear-resistant refractory castable and a preparation method thereof.
Background
The heat-insulating wear-resistant castable refractory is an important basic functional material for energy conservation, consumption reduction and stable operation of a high-temperature industrial kiln. At present, single-function heat-insulation refractory materials (such as spinel, forsterite, high-alumina refractory materials and the like) or wear-resistant refractory materials (such as corundum, mullite, silicon carbide refractory materials and the like) have rich varieties and excellent performances, but are difficult to have the characteristics of heat insulation and wear resistance; meanwhile, the development cost and the construction performance of the refractory material need to be considered, which is mainly caused by the fact that the heat-insulating refractory material has high porosity and weak bonding strength, and further has poor wear resistance; the wear-resistant refractory material has a large heat conductivity coefficient (such as corundum, silicon carbide and the like) and a poor heat insulation effect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and aims to provide a preparation method of a heat-insulating wear-resistant refractory castable material with low cost and simple process.
In order to achieve the purpose, the invention adopts the technical scheme that:
60-65 wt% of bauxite chamotte and 5-8 wt% of fused quartz sand are used as aggregate, 20-25 wt% of ferrotitanium slag, 3-5 wt% of bentonite and 5-8 wt% of rho-Al2O3The micro powder is used as a base material; uniformly mixing the matrix material, adding the uniformly mixed matrix material into the aggregate, and uniformly mixing to obtain a mixture; and then adding water accounting for 5.5-6.0 wt% of the mixture into the mixture, uniformly stirring, and ageing for 0.4-0.5 h at room temperature to prepare the heat-insulating wear-resistant castable refractory.
The high bauxiteThe particle size of the clinker is 3-4 mm, and the sphericity of the bauxite clinker is 0.8-0.9; the bauxite chamotte comprises the following main chemical components: al (Al)2O3Is 85-90 wt% of SiO2The content of (B) is 5-10 wt%.
The particle size of the fused quartz sand is 1-3 mm; SiO of the fused silica sand2The content is more than or equal to 99.5 wt%.
The ferrotitanium slag is slag generated by smelting ferrotitanium, and the granularity of the ferrotitanium slag is less than or equal to 90 mu m; the main chemical components of the ferrotitanium slag are as follows: al (Al)2O370-75 wt% of TiO210-13 wt%, CaO 7-12 wt%, Fe2O3The content of (B) is less than or equal to 1 wt%.
The particle size of the bentonite is less than or equal to 90 mu m; the bentonite comprises the following main chemical components: al (Al)2O3Is 25 to 30 wt% of SiO260-65 wt% of Fe2O3The content of (B) is less than or equal to 1.5 wt%.
The rho-Al2O3The granularity of the micro powder is less than or equal to 60 mu m; the rho-Al2O3Micronized Al2O3The content is more than or equal to 99 wt%.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
1. the invention takes high bauxite and fused quartz as main raw materials and is supplemented with slag generated by smelting ferrotitanium, thus obviously reducing the preparation cost of the heat-insulating wear-resistant refractory castable; the heat-insulating wear-resistant castable refractory is prepared by mixing the raw materials of all the components, and the process flow is simple.
2. The heat-insulating wear-resistant refractory castable prepared by the method can reduce the heat conductivity coefficient and enhance the fluidity by utilizing the accumulation of spherical aggregates (high-alumina bauxite clinker); and passing through rho-Al2O3Hydration combination improves the wear resistance of the heat-insulating wear-resistant refractory castable.
The heat-insulating wear-resistant refractory castable prepared by the invention is determined as follows: the vibration flow value is 65-70%; the thermal conductivity coefficient is 1.8-2.3 W.m-1·K-1(ii) a The abrasion loss of the abrasion resistance test is 3.5-4.0 cm3。
Therefore, the invention has the characteristics of low cost and simple process; the prepared heat-insulating wear-resistant refractory castable has small heat conductivity coefficient, strong wear resistance and good fluidity.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
In order to avoid repetition, the raw materials related to this specific embodiment are uniformly described as follows, and are not described in detail in the embodiments:
the granularity of the bauxite chamotte is 3-4 mm, and the sphericity of the bauxite chamotte is 0.8-0.9; the bauxite chamotte comprises the following main chemical components: al (Al)2O3Is 85-90 wt% of SiO2The content of (B) is 5-10 wt%.
The particle size of the fused quartz sand is 1-3 mm; SiO of the fused silica sand2The content is more than or equal to 99.5 wt%.
The ferrotitanium slag is slag generated by smelting ferrotitanium, and the granularity of the ferrotitanium slag is less than or equal to 90 mu m; the main chemical components of the ferrotitanium slag are as follows: al (Al)2O370-75 wt% of TiO210-13 wt%, CaO 7-12 wt%, Fe2O3The content of (B) is less than or equal to 1 wt%.
The particle size of the bentonite is less than or equal to 90 mu m; the bentonite comprises the following main chemical components: al (Al)2O3Is 25 to 30 wt% of SiO260-65 wt% of Fe2O3The content of (B) is less than or equal to 1.5 wt%.
The rho-Al2O3The granularity of the micro powder is less than or equal to 60 mu m; the rho-Al2O3Micronized Al2O3The content is more than or equal to 99 wt%.
Example 1
A heat-insulating wear-resistant refractory castable and a preparation method thereof. The preparation method in this example is:
60 to 62 weight percent of bauxite chamotte and 5 to 7 weight percent of bauxite chamotteFused quartz sand is used as aggregate, 23-25 wt% of ferrotitanium slag, 3.5-5 wt% of bentonite and 6-8 wt% of rho-Al2O3The micro powder is used as a base material; uniformly mixing the matrix material, adding the uniformly mixed matrix material into the aggregate, and uniformly mixing to obtain a mixture; and then adding water accounting for 5.5-5.7 wt% of the mixture into the mixture, uniformly stirring, ageing for 0.4-0.5 h at room temperature, and thus obtaining the heat-insulating wear-resistant castable refractory.
The heat-insulating wear-resistant refractory castable prepared in the embodiment is determined by the following steps: the vibration flow value is 65-67%; the thermal conductivity coefficient is 1.8-2.0 W.m-1·K-1(ii) a The abrasion loss of the abrasion resistance test is 3.5-3.7 cm3。
Example 2
A heat-insulating wear-resistant refractory castable and a preparation method thereof. The preparation method in this example is:
61-63 wt% of bauxite chamotte and 5-7 wt% of fused quartz sand are used as aggregate, 22-24 wt% of ferrotitanium slag, 3.5-5 wt% of bentonite and 6-8 wt% of rho-Al2O3The micro powder is used as a base material; uniformly mixing the matrix material, adding the uniformly mixed matrix material into the aggregate, and uniformly mixing to obtain a mixture; and then adding water accounting for 5.6-5.8 wt% of the mixture into the mixture, uniformly stirring, and ageing for 0.4-0.5 h at room temperature to prepare the heat-insulating wear-resistant castable refractory.
The heat-insulating wear-resistant refractory castable prepared in the embodiment is determined by the following steps: the vibration flow value is 66-68%; the thermal conductivity coefficient is 1.9-2.1 W.m-1·K-1(ii) a The abrasion loss of the abrasion resistance test is 3.6-3.8 cm3。
Example 3
A heat-insulating wear-resistant refractory castable and a preparation method thereof. The preparation method in this example is:
62-64 wt% of bauxite chamotte and 6-8 wt% of fused quartz sand are used as aggregate, 21-23 wt% of ferrotitanium slag, 3-4.5 wt% of bentonite and 5-7 wt% of rho-Al2O3The micro powder is used as a base material; firstly, the matrix materials are mixed evenly, and then the mixture is mixed evenlyAdding the base material into the aggregate, and uniformly mixing to obtain a mixture; and then adding water accounting for 5.7-5.9 wt% of the mixture into the mixture, uniformly stirring, ageing for 0.4-0.5 h at room temperature, and thus obtaining the heat-insulating wear-resistant castable refractory.
The heat-insulating wear-resistant refractory castable prepared in the embodiment is determined by the following steps: the vibration flow value is 67-69%; the thermal conductivity coefficient is 2.0-2.2 W.m-1·K-1(ii) a The abrasion loss of the abrasion resistance test is 3.7-3.9 cm3。
Example 4
A heat-insulating wear-resistant refractory castable and a preparation method thereof. The preparation method in this example is:
63-65 wt% of bauxite chamotte and 6-8 wt% of fused quartz sand are used as aggregate, 20-22 wt% of ferrotitanium slag, 3-4.5 wt% of bentonite and 5-7 wt% of rho-Al2O3The micro powder is used as a base material; uniformly mixing the matrix material, adding the uniformly mixed matrix material into the aggregate, and uniformly mixing to obtain a mixture; and then adding water accounting for 5.8-6.0 wt% of the mixture into the mixture, uniformly stirring, and ageing for 0.4-0.5 h at room temperature to prepare the heat-insulating wear-resistant castable refractory.
The heat-insulating wear-resistant refractory castable prepared in the embodiment is determined by the following steps: the vibration flow value is 68-70%; the thermal conductivity coefficient is 2.1-2.3 W.m-1·K-1(ii) a The abrasion loss of the abrasion resistance test is 3.8-4.0 cm3。
Compared with the prior art, the specific implementation mode has the following positive effects:
1. in the specific embodiment, the high-alumina bauxite and the fused quartz are used as main raw materials, and the slag generated by smelting ferrotitanium is used as an auxiliary material, so that the preparation cost of the heat-insulating wear-resistant refractory castable is obviously reduced; the heat-insulating wear-resistant castable refractory prepared by mixing the raw materials has simple process flow.
2. According to the specific embodiment, the heat-insulating wear-resistant refractory castable prepared by the method can reduce the heat conductivity coefficient and enhance the fluidity by utilizing the accumulation of spherical aggregates (high-alumina bauxite clinker); and passing through rho-Al2O3Hydration combination improves the wear resistance of the casting material.
The heat-insulating wear-resistant refractory castable prepared by the specific embodiment is determined by the following steps: the vibration flow value is 65-70%; the thermal conductivity coefficient is 1.8-2.3 W.m-1·K-1(ii) a The abrasion loss of the abrasion resistance test is 3.5-4.0 cm3。
Therefore, the specific implementation mode has the characteristics of low cost and simple process; the prepared heat-insulating wear-resistant refractory castable has small heat conductivity coefficient, strong wear resistance and good fluidity.

Claims (7)

1. The preparation method of the heat-insulating wear-resistant refractory castable is characterized by taking 60-65 wt% of high-alumina bauxite clinker and 5-8 wt% of fused silica sand as aggregates, and taking 20-25 wt% of ferrotitanium slag, 3-5 wt% of bentonite and 5-8 wt% of rho-Al2O3The micro powder is used as a base material; uniformly mixing the matrix material, adding the uniformly mixed matrix material into the aggregate, and uniformly mixing to obtain a mixture; then adding water accounting for 5.5-6.0 wt% of the mixture into the mixture, uniformly stirring, ageing for 0.4-0.5 hours at room temperature, and preparing the heat-insulating wear-resistant castable refractory;
the particle size of the bauxite chamotte is 3-4 mm, and the sphericity of the bauxite chamotte is 0.8-0.9.
2. The preparation method of the heat-insulating wear-resistant refractory castable according to claim 1, wherein the main chemical components of the bauxite chamotte are: al (Al)2O3Is 85-90 wt% of SiO2The content of (B) is 5-10 wt%.
3. The preparation method of the heat-insulating wear-resistant refractory castable according to claim 1, wherein the particle size of the fused silica sand is 1-3 mm; SiO of the fused silica sand2The content is more than or equal to 99.5 wt%.
4. The preparation method of the heat-insulating wear-resistant castable refractory according to claim 1, characterized in thatThe ferrotitanium slag is slag generated by smelting ferrotitanium, and the granularity of the ferrotitanium slag is less than or equal to 90 mu m; the main chemical components of the ferrotitanium slag are as follows: al (Al)2O370-75 wt% of TiO210-13 wt%, CaO 7-12 wt%, Fe2O3The content of (B) is less than or equal to 1 wt%.
5. The preparation method of the heat-insulating wear-resistant refractory castable according to claim 1, characterized in that the particle size of the bentonite is less than or equal to 90 μm; the bentonite comprises the following main chemical components: al (Al)2O3Is 25 to 30 wt% of SiO260-65 wt% of Fe2O3The content of (B) is less than or equal to 1.5 wt%.
6. The preparation method of the heat-insulating wear-resistant refractory castable according to claim 1, wherein the rho-Al is2O3The granularity of the micro powder is less than or equal to 60 mu m; the rho-Al2O3Micronized Al2O3The content is more than or equal to 99 wt%.
7. A heat-insulating wear-resistant castable refractory, which is characterized by being prepared according to the preparation method of the heat-insulating wear-resistant castable refractory of any one of claims 1-6.
CN201810393804.0A 2018-04-27 2018-04-27 Heat-insulating wear-resistant refractory castable and preparation method thereof Active CN108424129B (en)

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CN110128136B (en) * 2019-06-18 2022-04-19 亚细亚新材料科技股份公司 Anti-static ceramic material and preparation method thereof
CN114409418B (en) * 2022-01-19 2023-02-07 宜兴市锅炉密封工程有限公司 High-strength wear-resistant castable and preparation method and application thereof
CN115925431B (en) * 2022-12-26 2023-09-05 宜兴瑞泰耐火材料工程有限公司 High-heat-conductivity self-flowing castable for water-cooled wall and preparation process thereof

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CN101805196A (en) * 2010-03-19 2010-08-18 蒋志忠 Preparation method of quick-drying anti-explosion wear-resistant casting material
CN102718543A (en) * 2012-06-12 2012-10-10 中材高新材料股份有限公司 Preparation method of ceramic membrane filter element for treatment of printing and dyeing wastewater
CN103214253A (en) * 2013-04-27 2013-07-24 阳泉金隅通达高温材料有限公司 High-strength and anti-stripping type homogenous composite castable and preparation method
CN105481387A (en) * 2014-09-19 2016-04-13 青岛百键城环保科技有限公司 Novel casting material with abrasion resistance and corrosion resistance and preparation method of novel casting material
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