Solution mining of precious metals using aqueous, sulfur-bearing

Details Solution mining of precious metals using aqueous, sulfur-bearing Solution mining of precious metals using aqueous, sulfur-bearing

1996-06-14

1997-11-04

Silverberg, Sam

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75736, 75744, C22B 340

Patent

active

056834900

ABSTRACT:
Metallic forms of gold and other precious metals can be dissolved and transported (mined) using an aqueous sulfide-bearing leach solution. Maximum sulfur fugacities are achieved in sulfide-bearing solutions under approximately neutral pH and relatively reducing conditions. The optimum chemical conditions are achieved specifically by heating an aqueous sulfide solution such as NaHS, Na.sub.2 S, H.sub.2 S, (NH).sub.4 S, or other suitable forms to temperatures of at least about 100.degree. C. in the presence of excess elemental sulfur. The sulfide dissociates in the solution to form aqueous sulfide species including polysulfide and HS.sup.- which lixivate gold and other precious metals.

REFERENCES:
patent: 1372973 (1921-03-01), Middleton
Chemistry 2nd Edition, McGraw-Hill, 1961, pp. 524 and 525.

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