Ferrosilicon is an alloy of iron and silicon containing 15 to 95 percent silicon and used for deoxidizing molten steel and making silicon steel and high-silicon cast iron.
Ferrosilicon is produced by reducing the level of silica, or sand, through mixing coke with iron. Typical sources of iron are millscale, or from recycling scrap iron.
Ferrosilicons with silicon weight content up to about 15% are made in blast furnaces lined with acid fire bricks while higher weight content are made in electric arc furnaces.
The usual grades on the market are ferrosilicons with 45%, 65%, 70%, and 75% silicon. The remainder is iron, with about 2% consisting of other elements like aluminum and calcium.
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