Thermophilic microbial treatment of precious metal ores

Details Thermophilic microbial treatment of precious metal ores Thermophilic microbial treatment of precious metal ores

1987-01-23

1988-03-08

Stoll, Robert L.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 2, 75 97A, 75101R, 75105, 75108, 423 22, 423 27, 423 29, 423DIG17, C22B 1104

Patent

active

047297883

ABSTRACT:
A method is provided for the recovery of precious metals, such as gold and silver, from refractory sulfidic material and refractory carbonaceous sulfidic material. The sulfidic material is pulped and bioleached using either facultative or obligate thermophiles at temperatures in excess of about 45.degree. C. and ranging up to about 90.degree. C. The residue remaining from the bioleach is neutralized and washed and the precious metals therein recovered by dissolution.

REFERENCES:
patent: 4497778 (1985-02-01), Pooley
patent: 4571387 (1986-02-01), Bruynesteyn et al.
Tuovinen, O. H. and Kelly, D. P., "Use of Micro-Organisms for the Recovery of Metals", International Metallurgical Reviews, Review 179, vol. 19, 1974, pp. 21-29.

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