Precious metal recovery

C - Chemistry – Metallurgy – 25 – C

Patent

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C25C 1/20 (2006.01)

Patent

CA 2563435

Precious metals can be selectively removed from a solution containing an excess of base metals by electrolysis in a divided cell. This necessitates controlling the pH of the solution, and controlling the voltage applied to the electrodes, such that precious metals are deposited preferentially on the electrode in contact with the solution. For example the precious metals may be deposited selectively onto an anode, presumably with formation of a hydrous oxide, if the pH is held at say less than pH 1.0 and the cell voltage held less than 1.3 V.

On peut sélectivement retirer des métaux précieux d'une solution contenant un excès de métaux de base par électrolyse dans une pile divisée. Ceci nécessite de contrôler le pH de la solution et de contrôler la tension appliquée aux électrodes, de sorte que les métaux précieux soient déposés de préférence sur l'électrode en contact avec la solution. Par exemple, les métaux précieux peut être déposés sélectivement sur une anode, en principe avec formation d'un oxyde hydrique, si le pH est maintenu, disons à une valeur inférieure à 1.0 et, si la tension de la pile est maintenue < 1, 3 V.

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