2024-03-22 14:31:59
Unshaped refractory material is a mixture of various raw materials and additives, which is made by processes such as molding, drying, and high-temperature sintering. Due to its excellent wear resistance, fire resistance, and corrosion resistance, it is widely used in fields such as steel, non-ferrous metals, ceramics, and building materials.
Unshaped refractory materials can be divided into five categories: siliceous, clayey, high alumina, corundum, and mullite. The following will introduce the raw material composition, preparation process, and application fields of these five types of amorphous refractory materials.
1、 Silicon based amorphous refractory materials
Silicon based amorphous refractory materials are mainly made of silica as the main raw material, with the addition of some adhesives and mineralizers. The chemical composition of silica is mainly SiO2, with a content generally above 90%. In addition, some mineralizers such as limestone and dolomite will be added to promote the melting and mineralization of silica.
The preparation process of amorphous silica refractory materials mainly includes steps such as batching, mixing, forming, drying, and sintering. During the sintering process, silica will melt into a glass phase, and the mineralizer will react with silica to generate corresponding minerals. Silicon based amorphous refractory materials have high fire resistance and wear resistance, and are mainly used in high-temperature furnaces and kilns in the fields of steel, non-ferrous metals, and building materials.
2、 Clay based amorphous refractory materials
Clay based amorphous refractory materials are mainly made of clay as the main raw material, with an appropriate amount of binder and mineralizer added. The chemical composition of clay is mainly Al2O3 · 2SiO2 · 2H2O, with a content generally above 30%. In addition, some kaolin, porcelain clay, etc. will be added as mineralizers.
The preparation process of clay based amorphous refractory materials is similar to that of silica based amorphous refractory materials, including steps such as batching, mixing, forming, drying, and sintering. During the sintering process, the moisture in the clay will evaporate, and the mineralizing agent will react with the clay to generate corresponding minerals. Clay based amorphous refractory materials have good fire resistance and slag resistance, and are mainly used in high-temperature furnaces and kilns in the fields of steel, non-ferrous metals, and building materials.
3、 High alumina amorphous refractory materials
High alumina amorphous refractory materials are mainly made of high alumina bauxite as the main raw material, with an appropriate amount of binder and mineralizer added. The chemical composition of high alumina bauxite is mainly Al2O3, with a content generally above 45%. In addition, some mullite, corundum, and other minerals will be added as mineralizers.
The preparation process of high alumina amorphous refractory materials is similar to that of silica and clay amorphous refractory materials, including steps such as batching, mixing, forming, drying, and sintering. During the sintering process, high alumina alumina will melt into a glass phase, and the mineralizer will react with high alumina alumina to generate corresponding minerals. High alumina amorphous refractory materials have high refractory and slag resistance, and are mainly used in high-temperature furnaces and kilns in the fields of steel, non-ferrous metals, and building materials.
4、 Corundum based unshaped refractory material
Corundum based amorphous refractory materials are mainly made of corundum as the main raw material, with the addition of appropriate binders and mineralizers. The chemical composition of corundum is mainly Al2O3, with a content generally above 95%. In addition, some oxides will be added as mineralizers.
The preparation process of corundum based amorphous refractory materials is similar to that of silica based, clay based, and high alumina based amorphous refractory materials, including steps such as batching, mixing, forming, drying, and sintering. During the sintering process, corundum will melt into a glass phase, and the mineralizing agent will react with corundum to generate corresponding minerals. Corundum based amorphous refractory materials have very high fire resistance and wear resistance, and are mainly used in high-temperature furnaces and kilns in the fields of steel, non-ferrous metals, and building materials.
5、 Mullite based amorphous refractory material
Mullite based amorphous refractory materials are mainly made from mullite as the main raw material, with an appropriate amount of binder and mineralizer added. The chemical composition of mullite is mainly Al2O3 · SiO2, with a content generally above 70%. In addition, some kaolin, porcelain clay, etc. will be added as mineralizers.
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