What are the functions of wollastonite powder in refractories
Silica fume is also called micro silica fume or agglomerated silica fume. When ferroalloys smelt ferrosilicon and industrial silicon (silicon metal), a large number of highly volatile SiO2 and Si gases are produced in the submerged arc furnace. After the gas is discharged, it quickly oxidizes and condenses with the air to form silica fume and silica fume powder. However, the performance of H-system silica fume is more outstanding in the field of concrete and refractories: addition of silica fume In the special refractories (such as Portland cement, kiln brick, etc.), a multi-layer protective layer is formed in the oxidation process, which has good mechanical properties and high-temperature oxidation resistance. After the special refractories are added with ultra-fine silica powder, their fluidity, sintering, binding and filling porosity properties are improved to varying degrees. The structure density and strength are increased, the wear rate of the material is reduced, and the erosion resistance is enhanced.