The composition of thermal insulation refractories

Release Time:

2022-08-22

Insulation refractory material refers to refractory material with high porosity, low bulk density and low thermal conductivity, also known as lightweight refractory material. Including thermal insulation refractories, refractory fibers and refractory fiber products. According to the use temperature, it is divided into: low temperature heat insulation refractory materials, the use temperature is lower than 900 ℃, such as diatomite heat insulation bricks, expanded silica products, silicon calcium boards, expanded perlite products, etc.; medium temperature heat insulation refractory materials, the use temperature is 900 ~1200℃, such as clay heat insulating refractory bricks, aluminum silicate refractory fibers, etc.; high temperature heat insulating refractory materials, the use temperature is greater than 1200℃, such as high alumina heat insulating refractory bricks, alumina heat insulating refractory bricks, siliceous insulating refractory bricks, etc. Thermal refractory bricks, alumina hollow ball bricks, zirconia hollow ball bricks, high alumina refractory fibers, polycrystalline refractory fibers (polycrystalline alumina fibers, polycrystalline zirconia fibers, polycrystalline mullite fibers), etc.

The production of heat-insulating refractory products mainly adopts process methods that can form porous structures, such as light-weight raw material method, burn-out addition method, foam method, chemical method, etc. Amorphous refractory fibers, such as aluminosilicate refractory fibers, high-alumina refractory fibers, etc., are usually produced by the fusion method. Polycrystalline refractory fibers, such as mullite fibers, alumina fibers, etc., are produced by the colloid method.

The main characteristics of thermal insulation refractories are high porosity, generally above 45%; low bulk density, generally not more than 1.5g/cm³; low thermal conductivity, mostly less than 1.0W/(m·k). It is mainly used for thermal insulation of industrial furnace cellars, it can not only reduce the heat dissipation loss of the furnace cellar, but also reduce the heat storage of the furnace cellar, obtain the best energy saving effect, and reduce the weight of thermal equipment. Compared with general refractory bricks, thermal insulation refractories have poor slag corrosion resistance, mechanical strength and wear resistance. Therefore, it is not suitable for the load-bearing structure of the furnace cellar and the direct removal of slag, charge, molten metal and other parts.

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The composition of thermal insulation refractories