Process for the isolation of noble metals

Details Process for the isolation of noble metals Process for the isolation of noble metals

1984-12-26

1990-05-15

Stoll, Robert L.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Platinum group metal

423 25, 423 27, 423 34, 423 42, 423 24, 75744, C22B 1104

Patent

active

049254855

ABSTRACT:
The present invention involves the isolation or leaching of noble metals from materials containing noble metals, e.g. ores, by treating the noble metal- containing materials with a cyclic thiourea derivative under acid pH conditions. Removal is effected by adsorption onto charcoal or by an ion exchanger, for example. Preferred cyclic thioureas are N,N'-ethylenethiourea and N,N'-propylenethiourea and the acid pH conditions may be achieved by sulfuric acid or hydrochloric acid solutions containing 0.01 to 2.0% by weight of the cyclic thiourea.

REFERENCES:
patent: 3473921 (1969-11-01), Schmuckler
patent: 4021264 (1977-05-01), Knorre et al.
Groenewald, T., "The Dissolution of Gold in Acidic Solutions of Thiourea", Hydrometallurgy 1, (1976), pp. 277-290.
Hiskey, J. Brent, "Thiourea as a Lifivant for Gold and Silver", Proceedings from the 110th Al Me Meeting, Chicago, Ill., (1981), p. 83.

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