Upgrading domestic high-iron chromite concentrates by carbonyl extraction of excess iron /
by A. Visnapuu and W.M. Dressel.
- Pittsburgh, Pa. : U.S. Dept. of the Interior, Bureau of Mines, 1985.
- 17 p. : ill. ; 28 cm.
- Report of investigations ; 8920 .
- Report of investigations (United States. Bureau of Mines) ; 8920. .