Process for recovering silver and optionally gold from a solid s

Details Process for recovering silver and optionally gold from a solid s Process for recovering silver and optionally gold from a solid s

1977-10-18

1979-03-20

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75101R, 75109, 75115, C22B 1104

Patent

active

041452127

ABSTRACT:
The invention relates to a process for recovering silver and possibly gold contained in a silver and possibly gold bearing solid starting material, in which said metals are present in low proportions, a part thereof being in the form of free sulphides, possibly in mixture with elemental sulphur, in which said starting material is treated with an aqueous solution of thiourea, so as to solubilize the silver and the gold in the form of complexes with the thiourea, and the obtained solution is subjected to a cementation with a metal so as to obtain a cement containing more than about 90% of silver.

REFERENCES:
patent: 2304427 (1942-12-01), Sibley
patent: 3317313 (1967-05-01), Buggs et al.

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