Recovery of dissolved gold by sodium borohydride reduction

Details Recovery of dissolved gold by sodium borohydride reduction Recovery of dissolved gold by sodium borohydride reduction

C - Chemistry, Metallurgy

22

B

53/235

C22B 3/44 (2006.01) C22B 11/00 (2006.01)

Patent

CA 2013536

A process is disclosed for the direct recovery of gold from cyanide leach liquor, thiourea leach liquor or Bio-D leach liquor. The process comprises reduction precipitation of the gold from solution by the addition of stabilized alkali metal borohydride, preferably sodium, potassium, lithium or ammonium borohydride, at ambient temperature and pressure. High purity gold is obtained by heating the reduced precipitate to about 1200°C. The barren solution is in a condition such that it can be recycled to the upstream process.

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