Electrochemical process for the recovery of metallic iron...

C - Chemistry – Metallurgy – 25 – C

Patent

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C25C 1/06 (2006.01) C25B 1/26 (2006.01)

Patent

CA 2663652

An electrochemical process for the concurrent recovery of iron metal and chlorine gas from an iron-rich metal chloride solution, comprising electrolysing the iron-rich metal chloride solution in an electrolyser comprising a cathodic compartment equipped with a cathode having a hydrogen overpotential higher than that of iron and containing a catholyte having a pH below about 2, an anodic compartment equipped with an anode and containing an anolyte, and a separator allowing for anion passage, the electrolysing step comprising circulating the iron-rich metal chloride solution in a non-anodic compartment of the electrolyser, thereby causing iron to be electrodeposited at the cathode and chlorine gas to evolve at the anode, and leaving an iron-depleted solution. The iron-rich metal chloride solution may originate from carbo-chlorination wastes, spent acid leaching liquors or pickling liquors.

L'invention concerne un procédé électrochimique pour la récupération simultanée de fer métallique et de chlore gazeux à partir d'une solution de chlorure métallique riche en fer, comprenant l'électrolyse de la solution de chlorure métallique riche en fer dans un électrolyseur comprenant un compartiment cathodique équipé d'une cathode ayant une surtension d'hydrogène supérieure à celle du fer et contenant un catholyte ayant un pH inférieur à environ 2, un compartiment anodique équipé d'une anode et contenant un anolyte, et un séparateur permettant le passage d'anions, l'étape d'électrolyse comprenant la mise en circulation de la solution de chlorure métallique riche en fer dans un compartiment non anodique de l'électrolyseur, ce qui entraîne le dépôt électrolytique du fer sur la cathode et l'émission de chlore gazeux à l'anode, et laisse une solution appauvrie en fer. La solution de chlorure métallique riche en fer peut provenir de déchets de carbo-chloration, de liqueurs de lixiviation acides usées ou de liqueurs de décapage.

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