The iron in ferrosilicon comes from steel scraps in the charge. According to the quality requirements of ferrosilicon, only ordinary carbon steel scraps are allowed to be used during smelting, and alloy steel scraps are not allowed, such as stainless steel, which contains high chromium, high manganese steel, which contains high manganese, etc.
Therefore, ferrosilicon manufacturers using alloy steel scraps to smelt ferrosilicon will cause waste products. Pig iron filings cannot be used either because of their high phosphorus content. Non-ferrous metal scraps such as copper, aluminum, etc. cannot be used for smelting ferrosilicon. Therefore, in order to ensure the quality of ferrosilicon, only steel scraps from ordinary carbon steel are allowed to be used during smelting.
Severely rusted steel scraps cannot be used because they have many impurities and the iron content is difficult to control during smelting. At the same time, severely rusted steel scraps have poor strength and a lot of powder, which affects the air permeability of the material surface when added to the furnace. Therefore, many ferrosilicon manufacturers in my country stipulate that the iron content of steel scraps used must be greater than 95%, and the surface must be clean without obvious impurities.
