Hydrometallurgical process for the recovery of precious...

C - Chemistry – Metallurgy – 22 – B

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C22B 3/04 (2006.01) C22B 3/06 (2006.01) C22B 3/08 (2006.01) C22B 3/46 (2006.01) C22B 11/00 (2006.01)

Patent

CA 2167571

A hydrometallurgical process for the re- covery of precious metal values from refractory precious metal ore materials containing organic carbonaceous matter in which solubilized gold complexes are absorbed by leaching the ore with a thiosulfate lixiviant. A heap (1) of such particulate ore material is contacted with a lix- iviant solution (10) at conditions conductive to the formation of stable precious metal thiosul- fate complexes. Thiosulfate lixiviant is then recovered from the body of the ore particulates after a period of contact sufficient for the lix- iviant solution to become pregnant (20) with precious metal values, which values are then recovered from the lixiviant solution (80).

L'invention concerne un procédé hydrométallurgique de récupération de métaux précieux de valeur à partir de matériaux réfractaires de minerais métalliques précieux contenant une matière carbonée organique, dans laquelle des complexes d'or solubilisés sont absorbés par lixiviation du minerai avec un agent de lixiviation à base de thiosulfate. Une halde (1) de ce matériau à minerai particulaire est mis en contact avec une solution de lixiviation (10) dans des conditions favorables à la formation de complexes stables de thiosulfate de métaux précieux. L'agent de lixiviation à base de thiosulfate est ensuite récupéré dans le corps des matières particulaires métallifères après avoir été en contact pendant une durée suffisante avec celles-ci pour que la solution de lixiviation devienne fertile (20) en métaux précieux de valeur, lesquels sont ensuite récupérés dans la solution de lixiviation (80).

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