• Categories:company news
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• Origin:中国钢铁新闻网
• Time of issue:2014-01-20 16:22
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(Summary description)　　Thermal insulation refractories refer to refractories with high porosity, low bulk density and low thermal conductivity. It is characterized by a porous structure (the porosity is generally 40% ~ 85%) and high thermal insulation.

　　heat-insulating refractories are mostly used as the heat-insulating layer, lining or heat-preserving layer of kilns, which can save fuel consumption. There are many varieties, mainly including lightweight refractory products, heat-insulating unshaped refractory materials and refractory fibers and their products.

　　1 Lightweight fire products

　　mainly include light silica bricks, light clay bricks, light high alumina bricks and alumina hollow sphere products. The bulk density of general light-weight refractory products is generally 0.6-1. 2g/cm3, and the operating temperature is generally 900~1350. Alumina hollow sphere products can be used for a long time under 800 Yi.

　　2 Refractory fiber and its products

　　Refractory fiber is a fibrous refractory material, a new type of high-efficiency heat insulation material. The main production methods of refractory fiber are melt injection method, high-speed centrifugal method and colloid method.

　　The main varieties of refractory fiber are aluminum silicate refractory fiber, zirconium-containing aluminum silicate refractory fiber, high-purity high-aluminum refractory fiber, polycrystalline mullite fiber, alumina fiber, zirconia fiber, etc. In addition, slag wool and glass fiber are used for low temperature insulation. Refractory fiber products are all kinds of blankets, felts, boards, ropes, papers and other high-temperature heat insulation materials made of refractory fibers as the main raw material.

　　Refractory fiber products have small bulk density, low thermal conductivity, good thermal stability and mechanical shock resistance. The bulk density of refractory fiber products is only 0.1 ~0.2g/cm3. Using refractory fiber products as the kiln lining, the heat storage loss is small, the fuel is saved, and the temperature rises quickly, which is especially obvious for the intermittent operation kiln. In addition, the refractory fiber also has the characteristics of softness, easy processing, and convenient construction. At present, the production and application of refractory fibers have developed rapidly, and the demand for refractory fibers by industrial enterprises such as metallurgy has become more and more urgent. After using refractory fibers in various high-temperature kilns, the energy-saving effect is significantly improved.