Microbial leaching of sulphide-containing ores

Details Microbial leaching of sulphide-containing ores Microbial leaching of sulphide-containing ores

1984-02-07

1985-02-05

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ib metal

423 47, 423 98, 423109, 423110, 423131, 423150, 423154, 423DIG17, 75 6, 75101R, 75118R, 435168, 435252, C01G 500

Patent

active

044977786

ABSTRACT:
A process of extracting metals from a material containing at least 10% by weight of pyrite and selected from the group consisting of ores containing sulphide, concentrates of such ores and mixtures of such ores and/or concentrates by microbial leaching which comprises roasting the material before the microbial leaching to convert part of the pyrite to pyrrhotite and thus remove part of the sulphur which is present as pyrite without the formation of any significant amount of metal oxide, the conversion corresponding to removal of at least 10% but not more than 50% of the sulphur present in the pyrite, and only thereafter leaching the thus roasted ore by treatment with bacteria, to extract the metals. The process is characterized by its improved efficiency in metal extraction.

REFERENCES:
patent: 679330 (1901-07-01), Peterson
patent: 709482 (1902-09-01), Gutensohn
patent: 4177067 (1979-12-01), Pepper
Tiorinen, "Use of Micro-Organisms for the Recovery of Metals" Int. Metallurgical Reviews, (1974) vol. 19, pp. 21-31.
Canadian Metallurgical Quarterly, vol. 11, No. 2 (1972) pp. 388-399.
Roman, Mineral Science Engineering vol. 5 No. 1 Jan., 1973, pp. 3-24.

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