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Electrochemical study of surface oxidation and collectorless flotation of arsenopyrite
Department of Mining Engineering, University of Kentucky, Lexington.
Chalmers University of Technology, Department of Inorganic Chemistry.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
1992 (English)In: Journal of Applied Electrochemistry, ISSN 0021-891X, E-ISSN 1572-8838, Vol. 22, no 11, p. 1095-1103Article in journal (Refereed) Published
Abstract [en]

The surface oxidation of arsenopyrite in alkaline solutions has been studied by cyclic voltammetry. The initial oxidation of arsenopyrite surface produces ferric hydroxide and a realgar-like compound according to the following rection:[Figure not available: see fulltext.] At higher potentials, the oxidation of arsenopyrite results in elemental sulphur and arsenate according to the following overall reaction: {Mathematical expression} Ferric hydroxide is precipitated and arsenate stays on the surface. Both elemental sulphur and realgar (AsS) are retained on the arsenopyrite substrate. Oxidation of arsenopyrite surfaces is not affected by potential cycling or by the presence of arsenic or sulphide species. The oxidation of hydroxyl ions takes place simultaneously with the arsenopyrite oxidation. Flotation tests demonstrated that freshly ground arsenopyrite is non-floatable in the absence of xanthate as collector. Good flotation was obtained for both freshly ground and aged arsenopyrite in the presence of EDTA. The flotation results support the reactions for arsenopyrite oxidation drawn from the electrochemical studies

Place, publisher, year, edition, pages
1992. Vol. 22, no 11, p. 1095-1103
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-4768DOI: 10.1007/BF01029592Local ID: 2c1f0320-8cb6-11de-8da0-000ea68e967bOAI: oai:DiVA.org:ltu-4768DiVA: diva2:977642
Note
Godkänd; 1992; 20090819 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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