Ion-exchange resins are currently used at gold-plating facilities to collect gold from waste solutions. The gold-containing feed solution is passed through an anion-exchange resin column where gold is adsorbed as Au(CN)2~. The present method of recovering the adsorbed gold is by drying and incineration of the resin. An alternative method involves eluting gold from the resin by use of a concentrated KSCN solution in a mixed solvent of water and DMF, followed by crystallization as potassium gold cyanide. A two-step process for regeneration of ion-exchange resins from which gold has been extracted has been developed. This process involves conversion from the initial thiocyanate form of the resin to the chloride form, followed by conversion to the hydroxide form. The operating temperature range has been determined to be 45-55 °C. Changes in flow rate and eluent concentration show little effect on the rate of thiocyanate elution.
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