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The non-oxidative dissolution of nickel sulphides in aqueous acidic solutions

Filmer, A.O. and Nicol, M.J. (1980) The non-oxidative dissolution of nickel sulphides in aqueous acidic solutions. Journal of the South African Institute of Mining and Metallurgy, 80 (12). pp. 415-424.

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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.

Publication Type: Journal Article
Publisher: SAIMM
Copyright: © 1980 SAIMM - THE SOUTHERN AFRICAN INSTITUTE OF MINING AND METALLURGY
Publishers Website: http://www.saimm.co.za/
URI: http://researchrepository.murdoch.edu.au/id/eprint/30048
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