Recovery of gold from solution by reduction-precipitation with s

Details Recovery of gold from solution by reduction-precipitation with s Recovery of gold from solution by reduction-precipitation with s

1991-01-30

1993-06-29

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C22B 322

Patent

active

052230236

ABSTRACT:
A process is disclosed for the direct recovery of gold from thiourea, thiocyanate or thiosulfate solutions or acidified thiourea leach liquor. The process comprises reduction precipitation of the gold from solution by the addition of stabilized alkali metal borohydride, preferably sodium or potassium borohydride, at ambient temperature and pressure. The resulting gold precipitate is generally of high purity and is readily separated by filtration. The barren solution is in a condition such that it can be recycled to the upstream process.

REFERENCES:
patent: 4096316 (1978-06-01), Tamai et al.
patent: 4913730 (1990-04-01), Deschenes et al.
patent: 4992200 (1991-02-01), Lin et al.
55-158828 Japan Abstracts Dec. 7, 1981.

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