Selective recovery of gold and silver from carbonate eluates
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United States of America Patent
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Nov 16, 1993
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N/A
app pub date -
Jul 22, 1992
filing date -
Jul 22, 1992
priority date (Note) -
Expired
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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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