Electrochemical process for the recovery of metallic iron...

C - Chemistry – Metallurgy – 25 – C

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C25C 1/06 (2006.01) C22B 3/04 (2006.01) C23F 1/26 (2006.01) C25B 1/02 (2006.01) C25B 1/22 (2006.01) C25B 11/04 (2006.01) C25C 7/00 (2006.01)

Patent

CA 2717887

An electrochemical process for the recovery of metallic iron or an iron-rich alloy, oxygen and sulfuric acid from iron-rich metal sulfate wastes is described. Broadly, the electrochemical process comprises providing an iron-rich metal sulfate solution; electrolyzing the iron-rich metal sulfate solution in an electrolyzer comprising a cathodic compartment equipped with a cathode having a hydrogen over- potential equal or higher than that of iron and containing a catholyte having a pH below about 6.0; an anodic compartment equipped with an anode and containing an anolyte; and a separator allowing for anion passage; and recovering electrodeposited iron or iron-rich alloy, sulfuric acid and oxygen gas. Electrolyzing the iron-rich metal sulfate solution causes iron or an iron-rich alloy to be electrodeposited at the cathode, nascent oxygen gas to evolve at the anode, sulfuric acid to accumulate in the anodic compartment and an iron depleted solution to be produced.

Cette invention concerne un procédé électrochimique de récupération de fer métallique ou dun alliage riche en fer, doxygène et dacide sulfurique à partir de déchets de métal sulfate riches en fer. Généralement parlant, le procédé électrochimique comprend les étapes consistant à : fournir une solution de métal sulfate riche en fer ; électrolyser la solution de métal sulfate riche en fer dans un électrolyseur comprenant un compartiment cathodique muni dune cathode ayant une surtension dhydrogène supérieure ou égale à celle du fer et contenant un catholyte dont la valeur pH est inférieure à environ 6.0, un compartiment anodique muni dune anode et contenant un anolyte, et un séparateur permettant le passage danions ; et récupérer le fer ou lalliage riche en fer déposé électrolytiquement, lacide sulfurique et loxygène gazeux. Lélectrolyse de la solution de métal sulfate riche en fer entraîne le dépôt électrolytique du fer ou dun alliage riche en fer sur la cathode, lémission doxygène gazeux à létat naissant au niveau de lanode, laccumulation dacide sulfurique dans le compartiment anodique et la production dune solution appauvrie en fer.

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