Recovery of precious metals from thiosulfate solutions

Details Recovery of precious metals from thiosulfate solutions Recovery of precious metals from thiosulfate solutions

C - Chemistry, Metallurgy

22

B

C22B 3/46 (2006.01)

Patent

CA 2439717

In one aspect, the present invention provides a method for recovering precious metal, and particularly gold, from a particulate substrate loaded with a precious metal-containing coating, in which a portion, but less than substantially all, of the particulate substrate is dissolved away to physically release precious metal-containing coating from the particulate substrate . The particulate substrate loaded with a precious metal-containing coating may be prepared during precious metal recovery operations by cementation of precious metal on a base metal particulate substrate from a pregnant leach solution, such as a leach solution including a thiosulfate lixiviant for the precious metal.

Dans un premier mode de réalisation, l'invention concerne un procédé de récupération d'un métal précieux, et particulièrement l'or, à partir d'un substrat particulaire enrobé d'un revêtement à base de métal précieux, dans lequel au moins une partie du substrat particulaire est dissoute pour libérer physiquement le revêtement à base de métal précieux du substrat particulaire. On peut préparer le substrat particulaire enrobé de revêtement à base de métal précieux au cours d'opérations de récupération de métal précieux par cémentation du métal précieux sur un substrat particulaire de métal commun à partir d'un lixiviat sursaturé, tel qu'un lixiviat contenant un produit de lixiviation à base de thiosulfate pour le métal précieux.

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