Recovery of precious metals

Details Recovery of precious metals Recovery of precious metals

1989-01-23

1990-01-23

Stoll, Robert L.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75101BE, 75105, 75106, 75121, 210660, 210684, 210685, 210688, 210904, 423 22, 423 24, 423 26, 423DIG14, C22B 1104

Patent

active

048955973

ABSTRACT:
Recovery of precious metals such as gold and silver from aqueous cyanide solutions thereof, by contact with a reagent containing a guanidine functionality. The guanidine reagent extracts the precious metal from the aqueous solution which is subsequently stripped from the guanidine reagent and recovered by conventional methods. Certain novel guanidine compounds suitable for extracting gold and silver are disclosed.

REFERENCES:
patent: 3473921 (1969-10-01), Schmuckler
patent: 4605504 (1986-08-01), Van Elven et al.
patent: 4774003 (1988-09-01), Miller et al.
patent: 4793852 (1988-12-01), Harris et al.
G. Koster and G. Schmuckler, Analytica Chimica Acta, 38 (1967), pp. 179-184.

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