Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
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.
Lin Wilson L.
Mattison Phillip L.
Virnig Michael J.
Henkel Corporation
Jaeschke Wayne C.
Span Patrick J.
Stoll Robert L.
Szoke Ernest G.
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