Production of electrolytic copper from dilute solutions...

C - Chemistry – Metallurgy – 25 – C

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C25C 1/12 (2006.01) C22B 3/06 (2006.01) C22B 3/44 (2006.01) C22B 15/14 (2006.01)

Patent

CA 2245018

The copper is selectively precipitated in the form of a sulfide from the solutions containing it, according to the reaction: CU2+ + S2 ~ CuS The precipitated solid, constituted by copper sulfide, is filtered, washed and then leached with a solution of ferric fluoborate and fluoboric acid, which dissolves the copper as a fluoborate while forming elemental sulfur, according to the reaction: CuS + 2Fe (BF4)3 ~ Cu (BF4)2 + 2Fe (BF4)2 + S° After filtering off the sulfur, the copper fluoborate solution is subjected to an electrolysis in a diaphragm cell, obtaining a deposit of pure copper at the cathode and a regenerated solution of ferric fluoborate at the anode, which is utilized to leach further copper sulfide.

On précipite sélectivement le cuivre contenus dans des solutions, sous forme de sulfure, selon la réaction : Cu2+ + S2 CuS. Le solide précipité, constitué de sulfure de cuivre, est filtré, lavé, puis lixivié à l'aide d'une solution de fluoroborate ferrique et d'acide fluoroborique, qui dissout le cuivre sous forme de fluoroborate tout en formant du soufre élémentaire, selon la réaction : CuS + 2Fe(BF4)3 Cu(BF4)2 + 2Fe(BF4)2 + S0. Après filtrage du soufre, la solution de fluoroborate de cuivre est soumise à une électrolyse dans une cellule à diaphragme, permettant d'obtenir un dépôt de cuivre pur à la cathode et une solution de fluoroborate ferrique régénérée à l'anode. Cette solution régénérée est réutilisée pour la lixiviation d'autre sulfure de cuivre.

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