Journal article
The non-oxidative dissolution of nickel sulphides in aqueous acidic solutions
Journal of the South African Institute of Mining and Metallurgy, Vol.80(12), pp.415-424
1980
Abstract
An account is given of a study on the non-oxidative dissolution in aqueous acidic solutions of nickel sulphides of different stoichiometric composition, in which a rotating ring-disc electrode was used. The rate of dissolution was found to depend on the potential of the sulphide and the nickel-to-sulphur stoichiometric ratio. A maximum rate for the dissolution of nickel from nickel sulphides containing an excess of nickel was recorded at potentials around -0,2 to -O,3V. The rate decreased markedly at more anodic potentials. For nickel-deficient nickel sulphides, the nonoxidative dissolution rate increased with a cathodic shift in potential. Under open-circuit conditions, a nickel sulphide of a composition approximating Ni ,S. reacted most rapidly. The dissolution rate was controlled by either a chemical or an electrochemical reaction at the electrode surface, had an activation energy of between 50 and 65 kJ.mol-1, and was independent of stirring speed.
Details
- Title
- The non-oxidative dissolution of nickel sulphides in aqueous acidic solutions
- Authors/Creators
- A.O. Filmer (Author/Creator)M.J. Nicol (Author/Creator)
- Publication Details
- Journal of the South African Institute of Mining and Metallurgy, Vol.80(12), pp.415-424
- Publisher
- SAIMM
- Identifiers
- 991005541923107891
- Copyright
- © 1980 SAIMM - THE SOUTHERN AFRICAN INSTITUTE OF MINING AND METALLURGY
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
- Publisher URL
- http://www.saimm.co.za/
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