ELECTROCHEMICAL STUDIES ON ANODIC DISSOLUTION OF SYNTHETIC NICKEL SULPHIDES

Acta Metall Sin

1988, Vol. 24

Issue (6): 463-470 DOI:

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ELECTROCHEMICAL STUDIES ON ANODIC DISSOLUTION OF SYNTHETIC NICKEL SULPHIDES

FANG Zhaoheng;CHEN Jiayong Institute of Chemical Metallurgy; Academia Sinica; Beijing

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FANG Zhaoheng;CHEN Jiayong Institute of Chemical Metallurgy; Academia Sinica; Beijing. ELECTROCHEMICAL STUDIES ON ANODIC DISSOLUTION OF SYNTHETIC NICKEL SULPHIDES. Acta Metall Sin, 1988, 24(6): 463-470.

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Abstract The anodic behaviours of synthetic nickel sulphides in H_2SO_4 solutionwere studied. When the anodes of Ni_3S_2, Ni_7S_6 and NiS are actively dissolved respec-tively, a solid layer is formed on the electrode surface with its nature and com-position depend on the applied potential. Based on the electrochemical Phenomena,phase and elemental compositions of the solid layer formed on the electrode surfacewere determined. The apparent number of electrons transfered during dissolution ofone Ni~(2+) was also measured. It can be considered that there are three parallel reac-tions occurred on the electrode: the reaction with formation of HSO_4~- or SO_4~(2-), thereaction with formation of sulphides as intermediates and the reaction of formingelemental S. With NiS_2, as an anode, formation of SO_4~(2-). or HSO_4~- can be consider-ed as the only reaction ocurred on the electrode.

Key words: nickel sulphide anodic dissolution electrochemical behaviour

Received: 18 June 1988

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