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Description

Ferro silicon is produced by reduction of silica or sand with coke in presence of scrap iron, millscale, or other source of iron. Ferro silicons with silicon content up to about *5% are made in blast furnaces lined with acid fire bricks. Ferro silicons with higher silicon content are made in electric arc furnaces. The usual formulations on the market are ferro silicons with *5%, *5%, *5%, and *0% silicon. The remainder is iron, with about 2% consisting of other elements like aluminium and calcium. An overabundance of silica is used to prevent formation of silicon carbide. Microsilica is a useful byproduct.