Recovery of precious metals

Details Recovery of precious metals Recovery of precious metals

1986-01-16

1989-03-21

Stoll, Robert L.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

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

Patent

active

048140074

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: 3346516 (1967-10-01), Minton
patent: 4013659 (1977-03-01), Durant et al.
Burstall, F. H. et al., "Ion Exchange Process for Recovery of Gold from Cyanide Solutions" Industrial and Engineering Chemistry, vol. 45, No. 8, 1953, pp. 1648-1658.
Kataoka, Arinolu, et al., "Method of Manufacture of Chelate Resin" Kokai Patent Announcement, Appl. #58-119394, Jan. 21, 1985.
A Review of the Development of Resins for Use in Hydrometallurgy, by B. R. Green 1985--pp. 627-636.
Unconventional Weak-Base Anion Exchange Resins, Useful for the Extraction of Metals, Especially Gold, by B. R. Green and A. H. Potgeiter, 1984--pp. 627-636.

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