Ferrosilicon Manufacturer Explains the Basis for Raw Material Selection
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Published Time:
2020-07-21
Ferrosilicon is a common additive in steelmaking, playing a significant role in deoxidation. This is because ferrosilicon reacts with oxygen in the molten steel to form silicon dioxide, which floats to the surface, achieving a good deoxidation effect. The selection of ferrosilicon raw materials significantly impacts its quality. To enhance understanding, let's follow ferrosilicon manufacturers to see how to choose raw materials. The main uses of ferrosilicon are as a deoxidizer and alloying agent in steelmaking. Phosphorus (P) and sulfur (S) are impurities that greatly affect steel quality. When ferrosilicon contains excessive phosphorus, it is prone to pulverization. Therefore, low phosphorus and sulfur content is required.
Ferrosilicon is a common additive in steelmaking, playing a crucial role in deoxidation. This is because ferrosilicon reacts with oxygen in the molten steel to form silicon dioxide, which floats to the surface, achieving effective deoxidation. The selection of ferrosilicon raw materials significantly impacts its quality. To enhance understanding, let's explore raw material selection with ferrosilicon manufacturers.
Ferrosilicon's primary uses are as a deoxidizer and alloying agent in steelmaking. Phosphorus (P) and sulfur (S) are impurities that greatly affect steel quality. High phosphorus content in ferrosilicon can cause it to powder. Therefore, low phosphorus and sulfur content is required. Phosphorus exists in silica as phosphorus pentoxide (P2O5), and during smelting, most of the phosphorus pentoxide is reduced by carbon and enters the ferrosilicon. Thus, the phosphorus pentoxide content in silica should be less than 0.02%.
Regarding sulfur content in silica, since sulfur (S) and silicon (Si) form silicon sulfides such as SiS and SiS2 during smelting, and these compounds are volatile at high temperatures, no requirements are set for sulfur content in silica. Higher calcium oxide (CaO) and magnesium oxide (MgO) content in silica increases slag volume during smelting and corrodes the taphole. Therefore, the total content of calcium oxide and magnesium oxide in silica should be less than 1%.