Biohydrometallurgical processing of ores, and microorganisms the

Details Biohydrometallurgical processing of ores, and microorganisms the Biohydrometallurgical processing of ores, and microorganisms the

1990-05-22

1991-06-04

Morris, Theodore

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

423DIG17, 423 27, C22B 318

Patent

active

050210882

ABSTRACT:
A process for the separation and recovery from an ore of a metal, or metals, particularly strategic and precious metals, notably gold. A carbon-containing, gold-bearing ore, notably a carbonaceous or carbonaceous pyritic ore, is contacted and microbially pretreated and leached with a heterotrophic microorganism, or admixture of microoganisms, at heterotrophic conditions to cultivate and grow and said microorganism, or microorganisms, and reduce the carbon content of the ore by consumption of the carbon. The ore, as a result of the heterotrophic pretreatment is subsequently more advantageously colonized by an autotrophic microorganism, or microorganisms, at autotrophic conditions, or hydrometallurgically treated, or both, to facilitate, enhance and increase the amount of gold recovered vis-a-vis a process wherein the gold is recovered (1) by hydrometallurgical processing alone at otherwise similar conditions, or (2), in treating a pyritic ore, by the combination of the autotrophic/hydrometallurgical processing, at otherwise similar conditions.

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Chemical Engineering McGraw Hill, Sep. 30, 1985, pp. 19-25.

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