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Beneficiation of Low-grade California Chromite Ores.
Salisbury-HB; Wouden-ML; Shirts-MB
MISSING :15 pages
The Bureau of Mines conducted research to determine if low-grade California chromite ores could be beneficiated to produce products suitable for commercial use. This research is part of a Bureau goal to provide technology capable of using low-grade domestic ores to meet emergency demands of the nation for metals and minerals and in particular those minerals, such as chromite, which are considered critical. Two ores from California were ground and treated using gravity concentration and magnetic separation techniques. An ore from auburn in central California, assaying 2.5 pct cr2o3, was treated by tabling and magnetic separation to yield a nonmagnetic product containing 44.7 pct cr2o3 at a recovery of 36.4 pct. Core drilling samples from the Seiad Creek area of northern California, assaying about 6 pct cr2o3, were upgraded by tabling to yield a concentrate containing nearly 50 pct cr2o3 with a recovery of 50 pct. Both products are suitable for metallurgical and/or chemical use.
IH; Report of Investigations
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division