The iron in ferrosilicon comes from the steel scraps in the charge. According to the quality requirements of ferrosilicon, 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 content, high manganese steel, high manganese content and so on. Therefore, smelting ferrosilicon with alloy steel scraps will result in waste products. Pig iron filings also cannot be used because of their high phosphorus content. Non-ferrous metal scraps such as copper and aluminum cannot be used for smelting ferrosilicon. Therefore, in order to ensure the quality of ferrosilicon, only ordinary carbon steel scraps are allowed to be used in smelting.
Severely rusted steel scraps cannot be used, because of the large amount of impurities, it is difficult to control the iron content during smelting. At the same time, the severely rusted steel scraps have poor strength and a lot of powder, which will affect the air permeability of the material surface when added to the furnace. Therefore, it is stipulated that the iron content of the steel scraps used should be greater than 95%, the surface should be clean, and no significant impurities are allowed.
The length of the steel shavings should not be too long to prevent uneven mixing and blockage of the feeding pipe. The excessively long steel shavings also make the charge unevenly overcharged and affect the unbalanced three-phase load. For this reason, it is advisable to stipulate that the length of the steel chips is not more than 100 mm.
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