Biological Leaching of Manganese Ores.
Noble-EG; Baglin-EG; Lampshire-DL; Eisele-JA
SME Preprint 91-189 1991 :14 pages
The U.S. Bureau of Mines is investigating microbial leaching as a method for recovering the metal values from a domestic low-grade manganese wad ore. Early work showed that heterotrophic microorganisms present in the ore solubilized manganese when cultured in a glucose-mineral salts medium. More recent shake-flask tests using molasses as the sole nutrient source extracted 97 pct of the manganese from minus 300-um ore in 4 weeks. Column bioleaching with the molasses medium solubilized 99 pct of the manganese from minus 6.3-Mm ore in 50 weeks. The results of flask, column, and laboratory-scale heap bioleaching studies are presented.
SME Preprint 91-189, 1991, 14 PP.