What Kind of Steel is Suitable for Smelting Ferrosilicon?
The iron in the ferrosilicon comes from the steel chips in the charge. According to the requirements of ferrosilicon quality, only ordinary carbon steel chips are allowed to be used in smelting, and alloy steel chips are not allowed, such as stainless steel, high chromium, high manganese steel, high manganese, etc. Therefore, smelting ferrosilicon, such as alloy steel scrap, will cause waste products. Pig iron scrap can not be used because of its high phosphorus content. Smelting ferrosilicon can not use non-ferrous metal chips, such as copper, aluminum, and so on. Therefore, in order to ensure the quality of ferrosilicon, only the steel chips of ordinary carbon steel are allowed to be used in smelting.
The steel chips with serious rust cannot be used. Due to its large amount of impurities, it is difficult to control the iron content during smelting. At the same time, the steel chips with serious rust have poor strength and many powders, which will affect the air permeability of the charge surface when added into the furnace. Therefore, it is required that the iron content of steel chips used shall be greater than 95%, and the surface shall be clean without significant impurities.
The length of steel scraps should not be too long to prevent uneven mixing and blocking of blanking pipe. Too long steel scraps also lead to uneven charging and affect the imbalance of three-phase load. Therefore, the length of steel chips shall not be more than 100mm.
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