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A comparative study of the dissolution of nickel and copper in acidified CuSO4-acetonitrile-H2O and CuCl2-NaCl-H2O solutions
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A comparative study of the dissolution of nickel and copper in acidified CuSO4-acetonitrile-H2O and CuCl2-NaCl-H2O solutions

Z-Y Lu, D.M. Muir and I.M. Ritchie
Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, Vol.168(1-2), pp.163-178
1984
DOI: https://doi.org/10.1016/0368-1874(84)87096-3
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Abstract

The electrochemistry of the dissolution of copper and nickel rotating disc electrodes in acidified CuSO4-AN-H2O and CuCl2-NaCl-H2O solutions was investigated. The rate constants calculated from electrochemical measurements indicate that the dissolution of copper in both CuCl2-NaCl-H2O and CuSO4-AN-H2O solutions, and nickel in CuCl2-NaCl-H2O solutions are all Cu(II) diffusion controlled. However, the dissolution of nickel in acidified CuSO4-AN-H2O solutions was shown to be controlled by the formation of a nickel oxide film. Rate constants for nickel dissolution were measured by three methods. Good agreement was obtained between the mixed potential predicted from polarization measurements and that observed in the dissolution process. These results contribute to a fundamental understanding of the reactivity of two comparable leach systems proposed for the processing of calcines derived from a segregation of dead roasted chalcopyrite/pentlandite concentrates.

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Citation topics
2 Chemistry
2.210 Corrosion & Deposition Chemistry
2.210.137 Corrosion Inhibition
Web Of Science research areas
Chemistry, Analytical
Electrochemistry
ESI research areas
Chemistry
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