The elution of gold from anion exchange resins

C - Chemistry – Metallurgy – 22 – B

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C22B 3/42 (2006.01) B01J 41/04 (2006.01) C22B 11/00 (2006.01)

Patent

CA 2386614

A process for the recovery of gold from anion exchange resins, the method comprising eluting with a nitrate salt to displace gold from the resin. The gold has been loaded on to the resin from a thiosulphate leach solution or pulp. The nitrate salt is preferably provided in the form of ammonium nitrate. Also provided is a process for the recovery of gold from thiosulphate leach solution or pulp, the method comprising the method steps of loading gold from a thiosulphate leach solution on to an anion exchange resin, eluting with a nitrate salt to displace gold from the resin, and recovering thiosulphate from the leach solution using a resin.

L'invention concerne un procédé de récupération d'or à partir de résines d'échange d'anions, consistant à éluer avec un sel de nitrate afin de déplacer l'or de la résine. L'or a été chargé sur la résine à partir d'une pulpe ou solution de lixiviation de thiosulfate. Le sel de nitrate se présente de préférence sous forme de nitrate d'ammonium. Cette invention concerne également un procédé de récupération d'or à partir d'une pulpe ou solution de lixiviation de thiosulfate, ledit procédé comportant les étapes de chargement de l'or à partir d'une solution de lixiviation de thiosulfate sur une résine d'échange d'anions, d'élution avec un sel de nitrate afin de déplacer l'or de la résine, et de récupération du thiosulfate à partir de la solution de lixiviation au moyen d'une résine.

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