Anti Crust Castable is mainly a kind of low cement castable composed of high alumina aggregate, silicon carbide aggregate and powder in a certain proportion, combined with ultrafine powder and 80% white cement.
Anti-crust refractory castables will form a glaze layer on the surface of the refractory castables at high temperatures, which can significantly reduce the number of crusts. Due to the addition of silicon carbide components, the castable has excellent wear resistance and corrosion resistance, whether it is in a high-temperature area or a highly erosive area, the strength is large, the expansion coefficient is small, and it is also resistant to thermal shock and skin resistance.
The reason why skinning occurs in cement rotary kilns is because the raw materials used in cement rotary kilns contain a variety of volatile elements. These elements pass through the pre-heating zone and the firing zone to reach the cooling zone. During the production process of the rotary kiln, the chemical changes continuously occur at high temperature, which causes the kiln material to have a certain viscosity and adhere to the surface of the refractory castable. It will stick more and more and become harder and harder, which will eventually stop the kiln for processing.
The addition of silicon carbide to the anti-crust refractory castable has its unique properties. In large-scale rotary kilns, green silicon carbide is also added. The adhesion of silicon carbide to the raw material of the cement kiln is very small, and the raw cement is difficult to adhere to. The surface of the anti-crust refractory castables greatly reduces the agglomeration of raw cement in the kiln tailing slope and other parts.
Anti-crust refractory castables, In the production process, the addition of black silicon carbide or green silicon carbide is based on the size of different kiln diameters. Green silicon carbide is used in large-scale rotary kilns. The addition of black silicon carbide is used in the easy-to-skin parts such as the pre-heater slope of the large and medium-sized cement kiln, the rising flue, the decomposition furnace cone, and the wear resistance of the white ash kiln.
