Process and apparatus for recovery of cyanide and metals

Details Process and apparatus for recovery of cyanide and metals Process and apparatus for recovery of cyanide and metals

C - Chemistry, Metallurgy

22

B

C22B 11/08 (2006.01) C02F 1/461 (2006.01) C22B 15/00 (2006.01) C25C 1/12 (2006.01) C25C 1/20 (2006.01) C25C 5/02 (2006.01) C25C 7/00 (2006.01) C25C 7/04 (2006.01) C02F 1/00 (2006.01) C02F 1/44 (2006.01) C02F 1/467 (2006.01) C02F 9/00 (2006.01)

Patent

CA 2400806

Disclosed is a process for recovery of cyanide and metals from a liquor containing complexes of cyanide and metal typically generated by a metallurgical or industrial process. The process involves electrochemical dissociation of the metal-cyanide complex and electrowinning of the metal while free cyanide generated in the process is recovered in a membrane treatment step for re-use in a metallurgical process utilising it. An electrochemical apparatus, which may be used in the process, forms a further aspect of the invention. A membrane process alone, for separation of cyanide, from liquors containing cyanide complexes is a further aspect of the invention.

L'invention concerne un procédé de récupération de cyanure et de métaux d'une liqueur renfermant des complexes de cyanure et de métal habituellement formés par un processus métallurgique ou industriel. Le procédé consiste à effectuer une dissociation électrochimique du complexe métal-cyanure et une électro-extraction du métal tandis que le cyanure libre généré lors de ces opérations est récupéré dans une étape de traitement à membrane, et est destiné à être réutilisé dans un processus métallurgique. L'invention concerne également un appareil électrochimique qui peut être utilisé dans le procédé, ainsi qu'une technique de membrane permettant une séparation du cyanure à partir de liqueurs renfermant des complexes de cyanure.

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