Precious metal recovery using thiocyanate lixiviant

Details Precious metal recovery using thiocyanate lixiviant Precious metal recovery using thiocyanate lixiviant

C - Chemistry, Metallurgy

22

B

C22B 11/08 (2006.01) C22B 3/04 (2006.01) C22B 3/24 (2006.01)

Patent

CA 2520039

Precious metal-containing mineral material is subjected to an acidic thiocyanate leach to dissolve the precious metal as a precious metal- thiocyanate complex. A feed of the thiocyanate leach solution may include a large molar ratio of ferric iron to thiocyanate. Precious metal may be removed from pregnant thiocyanate leach solution, such as by transferring precious metal from precious metal-thiocyanate complex to precious metal-cyanide complex and then loading the precious metal-cyanide complex onto an adsorbent material. Remaining cyanide in the thiocyanate leach solution may be converted to thiocyanate for additional leaching of precious metal.

L'invention concerne une matière minérale contenant un métal précieux soumise à une lixiviation au thiocyanate acide afin de dissoudre le métal précieux en un complexe de métal précieux thiocyanate. Un apport de solution de lixiviation à base de thiocyanate peut comprendre un grand rapport molaire de fer ferrique sur le thiocyanate. Le métal précieux peut être récupéré de la solution de lixiviation de thiocyanate sursaturée, notamment par transfert du métal précieux du complexe de métal précieux thiocyanate vers le complexe de métal précieux cyanure, puis par chargement du complexe de métal précieux cyanure sur une matière adsorbante. Le cyanure restant dans la solution de lixiviation à base de thiocyanate peut être converti en thiocyanate pour une lixiviation supplémentaire du métal précieux.

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