Electrochemical recovery of arsenic

Details Electrochemical recovery of arsenic Electrochemical recovery of arsenic

C - Chemistry, Metallurgy

02

F

C02F 1/46 (2006.01) C25B 9/00 (2006.01) C25D 17/00 (2006.01)

Patent

CA 2620148

Contemplated devices and methods for arsenic recovery employ a two-step process in which an arsenite and arsenate-containing solution is first subjected to a non-electrochemical reduction that reduces arsenate and arsenite. The arsenate-depleted arsenite-containing solution is the subjected to electrochemical reduction at alkaline pH using a cathode with a high- surface carbon portion. Most preferably, the treated solution is then used as eluent for an adsorbent that removed arsenate and arsenite from a water supply.

L'invention porte sur des dispositifs et des procédés de récupération électrochimique de l'arsenic utilisant un processus en deux temps selon lequel une solution contenant un arsénite et un arséniate est d'abord soumise à une réduction non électrochimique réduisant l'arsénite et l'arséniate, puis à une réduction électrochimique à un pH alcalin en utilisant une cathode à large surface de carbone. Il est vivement recommandé d'utiliser la solution traitée comme éluent d'un adsorbant extrayant l'arsénite et l'arséniate d'alimentations en eau.

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