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Am Ceram Soc Bull 1989 May; 68(5):1037-1038
Chromite is the only source of chromium for metal alloys and chemicals and is also used in refractories and foundry sand. Chromite is accompanied by various amounts of silicate gangue minerals and is generally beneficiated. Compositions vary widely, from 28 to 56 pct cr2o3, with the important cr:fe ratio varying from 1.5 to 4.1. Silica content ranges from 0.8 to 14 pct. High-silica chromites are acceptable for some uses if the chromite is a hard lump type and the rest of the chemistry, e.g., Cr2O3 content and cr:fe ratio, is favorable. Alumina, magnesia, and iron oxide are other components. The United States has no commercial chromite deposits; it has been 100 pct import dependent for many years. This U.S. Bureau of Mines article reviews chromium output, use, etc., in 1987-88.
Issue of Publication
American Ceramic Society Bulletin
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division