Precious metal recovery from solution

Details Precious metal recovery from solution Precious metal recovery from solution

C - Chemistry, Metallurgy

22

B

C22B 11/00 (2006.01) C22B 3/06 (2006.01) C22B 3/44 (2006.01)

Patent

CA 2648491

A method for recovering precious metals such as gold and silver from aqueous solution as solid is described The method includes mixing an aqueous solution (e.g, thiosulfate or thiocyanate lixiviant) containing precious metals with ferrous ions in the presence of an effective amount of hydroxide ions. The precious metal ions are reduced and co-precipitate with iron hydroxides and/or hydrated iron oxides The co-precipitate is collected and purified. De-oxygenation of the reaction solution is optional. The recover/ method is fast, complete and clean.

Procédé de récupération de métaux précieux du type or et argent à partir de solution aqueuse sous forme de solide: mélange de solution aqueuse (par exemple, agent de lixiviation au thiosulfate ou au thiocyanate) contenant des métaux précieux avec des ions ferreux en présence d'une quantité efficace d'ions hydroxyde. Les ions de métaux précieux sont réduits et ils co-précipitent avec les hydroxydes de fer et/ou les oxydes de fer hydratés. On récupère et on purifie le co-précipitat. La désoxygénation de la solution de réaction est facultative. Il s'agit d'un procédé de récupération rapide complet et propre.

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