Effect of iron contamination from grinding media on the flotation of sulphide minerals of different particle size

Peng, Yongjun and Grano, Stephen (2010) Effect of iron contamination from grinding media on the flotation of sulphide minerals of different particle size. International Journal of Mineral Processing, 97 1-4: 1-6. doi:10.1016/j.minpro.2010.07.003


Author Peng, Yongjun
Grano, Stephen
Title Effect of iron contamination from grinding media on the flotation of sulphide minerals of different particle size
Journal name International Journal of Mineral Processing   Check publisher's open access policy
ISSN 0301-7516
Publication date 2010-11-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.minpro.2010.07.003
Open Access Status Not yet assessed
Volume 97
Issue 1-4
Start page 1
End page 6
Total pages 6
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Language eng
Subject 0904 Chemical Engineering
Abstract In a previous study, it was found that iron contamination from grinding media played a dominant role in depressing galena and chalcopyrite flotation (Y. Peng, S. Grano, D. Fornasiero, J. Ralston, Control of grinding conditions in the flotation of chalcopyrite and its separation from pyrite, Int. J. Miner. Process. 69 (2003) 87-100; Y. Peng, S. Grano, D. Fornasiero, J. Ralston, Control of grinding conditions in the flotation of galena and its separation from pyrite, Int. J. Miner. Process. 70 (2003) 67-82). In the current study, the effect of iron contamination on the flotation of galena and chalcopyrite on a particle size basis was investigated. It was observed that fine galena and chalcopyrite (- 10 μm) were affected by iron oxidation species emanating from grinding media to a much greater extent than intermediate size fractions (+ 10-53 μm), and that grinding conditions had a more pronounced effect on fine galena flotation than fine chalcopyrite flotation. Mechanisms were investigated by rest potential measurement, ToF-SIMS analysis, mineral dissolution study and zeta potential measurement. It appears that fine particles (- 10 μm) are more easily oxidised than intermediate particles resulting in a higher concentration of metal oxidation species. Oxidation of galena and chalcopyrite enhances adsorption of iron oxidation species at pH 9 by electrostatic interaction. Fine oxidised galena has a stronger affinity for iron oxidation species than fine oxidised chalcopyrite.
Formatted abstract
In a previous study, it was found that iron contamination from grinding media played a dominant role in depressing galena and chalcopyrite flotation (Y. Peng, S. Grano, D. Fornasiero, J. Ralston, Control of grinding conditions in the flotation of chalcopyrite and its separation from pyrite, Int. J. Miner. Process. 69 (2003) 87-100; Y. Peng, S. Grano, D. Fornasiero, J. Ralston, Control of grinding conditions in the flotation of galena and its separation from pyrite, Int. J. Miner. Process. 70 (2003) 67-82). In the current study, the effect of iron contamination on the flotation of galena and chalcopyrite on a particle size basis was investigated. It was observed that fine galena and chalcopyrite (- 10 μm) were affected by iron oxidation species emanating from grinding media to a much greater extent than intermediate size fractions (+ 10-53 μm), and that grinding conditions had a more pronounced effect on fine galena flotation than fine chalcopyrite flotation. Mechanisms were investigated by rest potential measurement, ToF-SIMS analysis, mineral dissolution study and zeta potential measurement. It appears that fine particles (- 10 μm) are more easily oxidised than intermediate particles resulting in a higher concentration of metal oxidation species. Oxidation of galena and chalcopyrite enhances adsorption of iron oxidation species at pH 9 by electrostatic interaction. Fine oxidised galena has a stronger affinity for iron oxidation species than fine oxidised chalcopyrite. © 2010 Elsevier B.V. All rights reserved.
Keyword Fine Particles
Intermediate Particle
Iron Contamination
Oxidation
Surface Reactivity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2011 Collection
 
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Created: Mon, 22 Nov 2010, 20:22:28 EST by Dr Yongjun Peng on behalf of School of Chemical Engineering