Selective recovery of gold and silver from carbonate eluates

Details Selective recovery of gold and silver from carbonate eluates Selective recovery of gold and silver from carbonate eluates

1992-07-22

1993-11-16

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C22B 344

Patent

active

052619451

ABSTRACT:
A process is disclosed for the direct and selective recovery of gold and/or silver from carbonate solutions, such as sodium carbonate which is used as an eluant for gold in a carbon-in-pulp process (CIP). The process comprises reduction precipitation of gold and/or silver from a carbonate solution having a pH in the alkaline range by the addition of stabilized alkali metal borohydride, such as sodium borohydride. The resulting gold and/or silver precipitate is generally of high purity and readily separated by filtration. The barren solution is in a condition such that it can be recycled to the upstream process.

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patent: 5178665 (1993-01-01), Haque

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