Microbial consortium treatment of refractory precious metal ores

Details Microbial consortium treatment of refractory precious metal ores Microbial consortium treatment of refractory precious metal ores

1991-08-20

1992-07-07

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

423 22, C22B 1100

Patent

active

051279428

ABSTRACT:
A method is provided for the recovery of precious metals, such as gold and silver, from refractory carbonaceous sulfidic material. The carbonaceous sulfidic material is ground and placed in heaps or piles or pulped or slurried and bioleached to oxidize the sulfide minerals using bacteria at temperatures from about 15.degree. C. and up to about 40.degree. C. The biooxidized residue is then treated using a specific microbial consortium, or a product of the microbial consortium, at temperature from about 5.degree. C. to 40.degree. C. to deactivate the carbonaceous component of the material to prevent binding of the precious metal to the carbonaceous component. The precious metal liberated in the residue remaining from the biological oxidation of sulfide and deactivation of carbon are recovered by dissolution.

REFERENCES:
patent: 4293333 (1981-10-01), Drobot
patent: 4293334 (1981-10-01), Drobot
patent: 4448886 (1984-05-01), Gestaut
patent: 4729788 (1988-03-01), Hutchins
patent: 4732608 (1988-03-01), Emmett

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