Extraction of valuable metal by acid cyanide leach

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 3/06 (2006.01) C22B 3/04 (2006.01) C22B 11/00 (2006.01) C22B 11/08 (2006.01) C22B 23/00 (2006.01) C22B 34/34 (2006.01) C22B 47/00 (2006.01)

Patent

CA 2322682

A process for extracting at least one valuable metal from starting material comprising a plurality of metallic compounds including (i) said at least one valuable metal and/or compound thereof, (ii) oxide of at least one other metal, and optionally (iii) sulphide of the same or different other metal, which process includes treating the starting material with liquid leaching agent containing (iv) acid and a source of halide ions, and with the same or different liquid leaching agent containing (v) a source of cyanide ions, so as to solubilise said valuable metal(s), and whereby liquor obtained from the treatment with leaching agent which contains said solubilised valuable metal(s) is caused to contact valuable metal-retaining means wherein said valuable metal(s) is (are) retained.

L'invention concerne un procédé permettant d'extraire au moins un métal utile d'un produit de départ comprenant plusieurs composés métalliques regroupant (i) au moins un métal utile et/ou composé de ce dernier, (ii) un oxyde d'au moins un autre métal, et éventuellement (iii) du sulfure de ce dernier ou d'autres métaux différents. Ce procédé consiste à traiter le produit de départ à l'aide d'agents de lixiviation liquides contenant (iv) de l'acide et une source d'ions d'halogénure et avec le même agent ou un agent de lixiviation liquide différent renfermant (v) une source d'ions de cyanure, de manière à solubiliser ce(s) métal(métaux) utile(s). La liqueur ainsi obtenue à partir du traitement par l'agent de lixiviation qui contient ce(s) métal(métaux) entre ensuite en contact avec des moyens de retenue du métal utile ou des métaux utiles, ce qui permet de retenir ce(s) dernier(s).

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