Gold Recovery processes

Details Gold Recovery processes Gold Recovery processes

1986-04-24

1987-07-21

Doll, John

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75105, 75108, 423 29, 423 30, 423 31, 423 42, 423 43, 423101, 204109, 204110, C22B 1104

Patent

active

046816283

ABSTRACT:
The invention relates to a process for the recovery of gold from an alkaline aqueous liquid solution containing gold-cyanide ion, and possibly silver and/or copper and/or mercury, which comprises adding a quantity of thiourea to the solution so as to allow formation of a gold complex with thiourea which gold complex is soluble and stable in dilute acid solution, then adjusting the pH of the solution to make the solution mildly acidic, whereby gold and mercury remain in solution in the liquid and silver and/or copper is incorporated in a precipitate containing silver and/or copper cyanide compounds, and then separating the precipitate from the liquid to leave a solution of dissolved gold complex and subsequently recovering the gold from the solution.

REFERENCES:
patent: 3218161 (1965-11-01), Kunda et al.
patent: 4256707 (1981-03-01), Flynn, Jr. et al.
patent: 4273579 (1981-06-01), Okugawa et al.
patent: 4595572 (1986-06-01), Agasa et al.

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