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Electrochemical deposition of silver and gold from cyanide leaching solutions

Reyes-Cruz, Victor, Ponce de Leon, Carlos, González, Ignacio and Oropeza, Mercedes.T. (2002) Electrochemical deposition of silver and gold from cyanide leaching solutions Hydrometallurgy, 65, (2-3), pp. 187-203. (doi:10.1016/S0304-386X(02)00083-X).

Record type: Article

Abstract

A systematic voltammetric study developed in this work allows the determination of the potential range at which the selective deposition of gold and silver is carried out in the presence of a high content of copper. As a first approach, laboratory solutions prepared with a high content of cyanide and copper and low values of gold and silver are used; later, the methodology is applied to leaching solutions of industrial origin.
The chemical speciation and microelectrolysis studies showed that copper deposition occurs at more negative potentials than deposition of gold and silver. Also, the voltammetric study of a cyanide solution containing low concentrations of Au(I) and Ag(I), free of and with high concentration of Cu(I) was carried out. The study shows the potential range at which Au(I) and Ag(I) are reduced despite the high concentration of the Cu(I) ions. The deposition of gold and silver was not interfered with by the high concentration of Cu(I) ions when the leaching solution was electrolyzed in a laboratory electrochemical reactor FM01-LC with a reticulated vitreous carbon (RVC) cathode.

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More information

Submitted date: 20 March 2001
Published date: September 2002
Keywords: Silver cyanide, Gold cyanide, Copper cyanide, Electrochemical recovery, Cyanide leaching, RVC electrode, Electrodeposition
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 54522
URI: http://eprints.soton.ac.uk/id/eprint/54522
ISSN: 0304-386X
PURE UUID: 9387817a-520f-4b96-937a-c4b6c67020b2

Catalogue record

Date deposited: 24 Jul 2008
Last modified: 17 Jul 2017 14:35

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Contributors

Author: Victor Reyes-Cruz
Author: Ignacio González
Author: Mercedes.T. Oropeza

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