How To Choose Silica To Improve The Quality Of Ferrosilicon

Silica is one of the basic raw materials for smelting ferrosilicon. In order to reduce the amount of slag, reduce the power consumption and increase the production, the content of silica in silica is required to be greater than 97%. Phosphorus and sulfur are impurities that have a great impact on the quality of steel. If there is more phosphorus in ferrosilicon, it is easy to pulverize ferrosilicon, so the content of phosphorus and sulfur is very low. Phosphorus exists in the state of phosphorus pentoxide (P2O5) in silica.

The sulfur content of silica, due to the smelting process of sulfur and silicon to form silicon sulfide, such as SiS, SiS2 and other compounds, these compounds volatilized away at high temperature, so the sulfur content of silica is not required. The content of calcium oxide and magnesium oxide in silica is high, smelting will increase the amount of slag, and erosion of iron mouth, so the sum of calcium oxide and magnesium oxide content in silica is required to be less than 1%.

The choice of silica is not only its content is so simple, in the production of ferrosilicon the size of silica particle also directly affects the quality of ferrosilicon products. The selection of large silica particles, it is easy to lead to insufficient contact between silica and other substances, so in production should also be carried out in accordance with strict operations.