Process for the recovery of gold

Details Process for the recovery of gold Process for the recovery of gold

1996-09-05

1999-03-23

Ryan, Patrick

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75736, 75737, 75744, C22B 1100

Patent

active

058853278

ABSTRACT:
Recovery of gold from alkaline cyanide leach solutions using ion exchange adsorbents, comprising (a) contacting the cyanide leach solution containing the gold with an extraction reagent comprised of a solid adsorbent carrying an organic base functionality of a compound having a pK.sub.a between about 9-14, such as a guanidyl functionality, to adsorb gold and eluting the adsorbed gold from the solid adsorbent with an aqueous alkaline eluant solution having a pH above about 12 and containing an alkali metal salt of an aromatic or aliphatic carboxylic acid having from about 4-14 carbon atoms, the eluant solution having incorprated therein from about 0.001 moles to about 0.2 moles per liter of an alkali metal cyanide salt. The solid adsorbent containing the aurocyanide complex may be contacted with a concentrated aqueous solution of a zinc tetracyanide salt whereby the aurocyanide complex is displaced with a zinc tetracyanide complex before treatment with the eluant solution.

REFERENCES:
patent: 4895597 (1990-01-01), Lin et al.
patent: 5028259 (1991-07-01), Lin et al.
patent: 5134169 (1992-07-01), Green et al.
patent: 5198021 (1993-03-01), Virnig
patent: 5340380 (1994-08-01), Virnig

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