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Calcium silicate insulation material is silica (quartz sand, diatomite, etc.), calcium oxide (also useful slaked lime, carbide slag, etc.) and reinforcing fibers (such as asbestos, glass fiber, etc.) as the main raw material, after stirring, heating , gel, molding, autoclave hardening, drying and other processes made of a new type of insulation material.
1. Production process: Lime water is added to digest the water, filtered through three sieves, put into the storage tank, and sent to the mixing tank with a mud pump, mixed with diatomaceous earth, water glass, asbestos (or other fibers) and water. , Then use the pump to send the mixed thick liquid to the gel drum to heat the gel, send it to the intermediate homogenization tank, and send it to the hydraulic press for forming. The wet product after molding is autoclaved and pressed into the autoclave. , and then sent to the drying room drying dehydration, after sampling quality inspection finished product storage. The entire process can be divided into: lime digestion, mixing ingredients, heating gel, pressure molding, autoclave hardening, and dry dehydration. The molding process of calcium silicate products is divided into casting molding and press molding. Casting molding, mold is relatively simple, low production costs, but the steamed products must go through the plastic stage, there is still uneven structure, the phenomenon of incomplete shape; press molding, need special presses and expensive molds, but After steaming, the products are complete in shape and uniform in structure.
2. The technical requirements stipulated in the standard GB/T10699-1998 "Calcium silicate insulation products" standards are: appearance quality, density, mass moisture content, compressive strength, bending strength, thermal conductivity (average temperature is 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, usually take 3 to 5 temperature points within the operating temperature range), the maximum operating temperature (including the temperature of the isothermal ignition test, linear shrinkage, cracks, residual compressive strength Strength, Combustion, Corrosivity, and Hydrophobicity.
3. Category 1 has asbestos calcium silicate. Calcium silicate prepared with asbestos fibers as reinforcing fibers. 2 No asbestos calcium silicate. A calcium silicate made of alkali-resistant glass fibers instead of asbestos fibers. Non-asbestos calcium silicate has an increase in thermal conductivity, mechanical strength, and line shrinkage, as compared to asbestos calcium silicate. In particular, the improvement of mechanical strength and brittleness is conducive to the reduction of engineering installation and loss. 3 Ultra light calcium silicate. The calcium silicate production process uses a static method, and the ultra light calcium silicate process uses a dynamic method. However, in the dynamic gelation process, the gelation process in the static method is changed to heat (abundant, bulky) amorphous or subcrystalline hydrates that are heated and stirred under high pressure, and then press-molded in the same manner as the static method. Autoclave and then dry in the drying room. The calcium silicate thus formed is called ultra light calcium silicate. Its thermal conductivity, flexural strength and other properties are superior to that of asbestos calcium silicate, especially light density 1/ 2, the use of temperature is also increased from 650 °C to 1000 °C. 4 high strength calcium silicate. High-strength calcium silicate is a material in which siliceous materials and calcium materials are synthesized by hydration reaction, with tobel mullite as the main crystal, and adhesives and reinforcing materials are used to increase the strength of the products while controlling the compression ratio to achieve the density. Requirements, change the process conditions to control the thermal conductivity, increase the shrinkage agent to control the shrinkage.
4. Application Status The application of calcium silicate insulation materials in China has been for decades. In the molding process, from pouring to pressing; in the material, from asbestos to asbestos-free; in terms of density, from the general to the Ultra-light; In terms of strength, from general to high-strength, its application involves the insulation of power, chemical, metallurgy, petrochemical, textile, light industry, building materials and other equipment and pipelines, and also involves the insulation of buildings, ships and trains. Insulation.
1. Production process: Lime water is added to digest the water, filtered through three sieves, put into the storage tank, and sent to the mixing tank with a mud pump, mixed with diatomaceous earth, water glass, asbestos (or other fibers) and water. , Then use the pump to send the mixed thick liquid to the gel drum to heat the gel, send it to the intermediate homogenization tank, and send it to the hydraulic press for forming. The wet product after molding is autoclaved and pressed into the autoclave. , and then sent to the drying room drying dehydration, after sampling quality inspection finished product storage. The entire process can be divided into: lime digestion, mixing ingredients, heating gel, pressure molding, autoclave hardening, and dry dehydration. The molding process of calcium silicate products is divided into casting molding and press molding. Casting molding, mold is relatively simple, low production costs, but the steamed products must go through the plastic stage, there is still uneven structure, the phenomenon of incomplete shape; press molding, need special presses and expensive molds, but After steaming, the products are complete in shape and uniform in structure.
2. The technical requirements stipulated in the standard GB/T10699-1998 "Calcium silicate insulation products" standards are: appearance quality, density, mass moisture content, compressive strength, bending strength, thermal conductivity (average temperature is 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, usually take 3 to 5 temperature points within the operating temperature range), the maximum operating temperature (including the temperature of the isothermal ignition test, linear shrinkage, cracks, residual compressive strength Strength, Combustion, Corrosivity, and Hydrophobicity.
3. Category 1 has asbestos calcium silicate. Calcium silicate prepared with asbestos fibers as reinforcing fibers. 2 No asbestos calcium silicate. A calcium silicate made of alkali-resistant glass fibers instead of asbestos fibers. Non-asbestos calcium silicate has an increase in thermal conductivity, mechanical strength, and line shrinkage, as compared to asbestos calcium silicate. In particular, the improvement of mechanical strength and brittleness is conducive to the reduction of engineering installation and loss. 3 Ultra light calcium silicate. The calcium silicate production process uses a static method, and the ultra light calcium silicate process uses a dynamic method. However, in the dynamic gelation process, the gelation process in the static method is changed to heat (abundant, bulky) amorphous or subcrystalline hydrates that are heated and stirred under high pressure, and then press-molded in the same manner as the static method. Autoclave and then dry in the drying room. The calcium silicate thus formed is called ultra light calcium silicate. Its thermal conductivity, flexural strength and other properties are superior to that of asbestos calcium silicate, especially light density 1/ 2, the use of temperature is also increased from 650 °C to 1000 °C. 4 high strength calcium silicate. High-strength calcium silicate is a material in which siliceous materials and calcium materials are synthesized by hydration reaction, with tobel mullite as the main crystal, and adhesives and reinforcing materials are used to increase the strength of the products while controlling the compression ratio to achieve the density. Requirements, change the process conditions to control the thermal conductivity, increase the shrinkage agent to control the shrinkage.
4. Application Status The application of calcium silicate insulation materials in China has been for decades. In the molding process, from pouring to pressing; in the material, from asbestos to asbestos-free; in terms of density, from the general to the Ultra-light; In terms of strength, from general to high-strength, its application involves the insulation of power, chemical, metallurgy, petrochemical, textile, light industry, building materials and other equipment and pipelines, and also involves the insulation of buildings, ships and trains. Insulation.