Process of stripping gold and silver from carbon

Details Process of stripping gold and silver from carbon Process of stripping gold and silver from carbon

C - Chemistry, Metallurgy

22

B

C22B 3/24 (2006.01) C22B 11/08 (2006.01)

Patent

CA 2050625

Gold and silver are stripped from activated carbon on which they are adsorbed as cyanide complexes by subjecting the activated carbon to a stripping solution comprising as the strippant an effective amount of a compound containing the carboxylate functionality. The compound is preferably selected from benzoic and substituted benzoic acids, and polyacrylic acids of less than about 100,000 m.w.

L'or et l'argent sont récupérés du charbon activé sur lequel ils sont adsorbés sous forme de complexes cyanurés en exposant le charbon activé à une solution contenant comme agent de piégeage une quantité efficace d'un composé contenant une fonction carboxylate. Le composé est préférablement choisi parmi les acides benzoïques et benzoïques substitués, et les acides polyacryliques de poids moléculaire inférieur à environ 100 000.

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