Anodic behaviour of arsenopyrite and cathodic reduction of ferrate(VI) and oxygen in alkaline solutions

Nicol, M. J. and Guresin, N. (2003) Anodic behaviour of arsenopyrite and cathodic reduction of ferrate(VI) and oxygen in alkaline solutions. Journal of Applied Electrochemistry, 33 11: 1017-1024.


Author Nicol, M. J.
Guresin, N.
Title Anodic behaviour of arsenopyrite and cathodic reduction of ferrate(VI) and oxygen in alkaline solutions
Journal name Journal of Applied Electrochemistry   Check publisher's open access policy
ISSN 0021-891X
Publication date 2003
Sub-type Article (original research)
DOI 10.1023/A:1026235700146
Volume 33
Issue 11
Start page 1017
End page 1024
Total pages 8
Place of publication Netherlands
Publisher Kluwer Academic Pub
Collection year 2003
Language eng
Subject C1
290702 Mineral Processing
640205 Other non-ferrous ores (e.g. copper, zinc)
0306 Physical Chemistry (incl. Structural)
0904 Chemical Engineering
Abstract This paper presents the results of an electrochemical study of the anodic characteristics of arsenopyrite in strongly alkaline solutions and of the cathodic reduction of ferrate( VI) and of dissolved oxygen at an arsenopyrite surface at potentials which are relevant to the oxidation reactions. Cyclic voltammetry at both arsenopyrite disc and arsenopyrite disc/platinum ring electrodes has shown that arsenic(III) is the main product of the anodic process at potentials in the region of the rest potential during oxidation by either ferrate( VI) or oxygen. Evidence for partial passivation of both the anodic and cathodic reactions has been obtained from potentiostatic current - time transients. The initial stage of oxidation by ferrate( VI) has been shown to be mass-transport controlled and this is also true of the oxidation by oxygen in dilute solutions of sodium hydroxide.
Keyword Alkaline Oxidation
Anodic Oxidation
Arsenopyrite
Electrochemistry
Electrolyte
Ferrate(vi)
Gold
Oxygen Reduction
Surface Oxidation
Q-Index Code C1

 
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