Recovery of gold from solution by reduction-precipitation with stabilized alkali metal borohydride
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United States of America Patent
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Jun 29, 1993
Grant Date -
N/A
app pub date -
Jan 30, 1991
filing date -
Mar 30, 1990
priority date (Note) -
Expired
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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.
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