After the crust is formed, it will continuously absorb SO3 from the gas stream to form a series of characteristic minerals, and the crust will become more and more processed. Therefore, once the crust appears, it must be discovered in time to accurately determine its location and deal with it.
The earliest anti-skinning measure was the use of anti-crust refractory materials to apply a layer of paint on the surface of the alkali-resistant brick. After firing, a layer of high SiO2 glaze is formed on the surface of the refractory material, but initially has an anti-skinning effect. After a few weeks of use, the glaze layer is worn away and Juin has no anti-skinning effect.
In order to further improve the anti-skinning effect, anti-crust refractory castables were developed. The anti-skin castable is a high-alumina silicon carbide product. Due to the high hardness of SIC (English hardness 9.2, small expansion coefficient), the temperature stability is very good, so SIC is a refractory material produced by raw materials. Good corrosiveness, high temperature strength, high thermal conductivity, small coefficient of linear expansion, good heat and malignancy, no anti-slip with cement raw materials, and good anti-skinning property.
Anti-crust castables are suitable for preheater cones, ascending flue and trimming. In the high temperature state, the anti-crust castable forms a glaze on the surface of the material, preventing the penetration of the glass phase in the cement raw meal, thereby preventing the skin from being crust. The material is mainly used for the skinned portion of the cyclone preheater, the ascending flue, the preheater cone and the like. As the ratio of unshaped refractory materials in the fire-retardant materials increases, the refractory castables will develop rapidly, and at the same time, the quality of the varieties will increase accordingly. The focus will still be on the development of low-cement, ultra-low cement and cement-free refractory castings. material.