Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1977-08-25
1978-09-05
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75 05A, 75109, 75114, 204126, C22B 1110
Patent
active
041116887
ABSTRACT:
A method for separating gold etc. from acid aqueous solution comprising a first step in which a silver amalgam with high silver content is added to acid aqueous solution containing gold to precipitate metallic gold, a second step in which silver amalgam with low silver content is added to the mother liquor from the first step to thereby separate silver amalgam in the mother liquor and a third step in which amalgam of base metal other than mercury is added to the mother liquor from the second step to thereby separate residual silver and mercury present in the mother liquor as a silver amalgam, or alternatively the mother liquor from the second step is electrolyzed by using mercury as a cathode to thereby precipitate residual silver and mercury present in the mother liquor as a silver amalgam on the cathode.
REFERENCES:
patent: 3729182 (1973-04-01), Schafer et al.
patent: 4019971 (1977-04-01), Crites
Agency of Industrial Science and Technology
Andrews M. J.
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