Inferring the distribution of iron oxidation species on mineral surfaces during grinding of base metal sulphides

Peng, Yongjun and Grano, Stephen (2010) Inferring the distribution of iron oxidation species on mineral surfaces during grinding of base metal sulphides. Electrochimica Acta, 55 19: 5470-5477. doi:10.1016/j.electacta.2010.04.097


Author Peng, Yongjun
Grano, Stephen
Title Inferring the distribution of iron oxidation species on mineral surfaces during grinding of base metal sulphides
Journal name Electrochimica Acta   Check publisher's open access policy
ISSN 0013-4686
Publication date 2010-07-30
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.electacta.2010.04.097
Volume 55
Issue 19
Start page 5470
End page 5477
Total pages 7
Place of publication Oxford, England
Publisher Pergamon Press
Collection year 2011
Language eng
Abstract Electrochemistry plays an important role in the flotation of base metal sulphide minerals. During grinding a galvanic interaction occurs between minerals and grinding media and controls the iron contamination on mineral surfaces, which depresses mineral flotation significantly. In this study, the galvanic interaction was quantified by measuring the iron oxidation species originated from grinding media by ethylene diamine-tetra acid (EDTA) extraction in single mineral and mixed mineral systems. It was found that the extent of galvanic interaction between minerals and grinding media was intimately associated with the electrochemical reactivity of minerals. The nobler the mineral, the stronger the galvanic interaction with grinding media, and the higher the amount of iron oxidation species from grinding media. For both galena and chalcopyrite a linear relationship was observed between the amount of iron oxidation species and flotation recovery in single mineral systems. This relationship was able to predict the iron oxidation species on galena and chalcopyrite surfaces when they were mixed with pyrite separately. The distribution of iron oxidation species onto the two minerals in the mixture changed with the ratio of the mineral surface areas and was correlated with mineral flotation recovery. The major cathodic mineral in the mixture was dictated by the combination of mineral surface area and reactivity and drew iron oxidation species from the grinding media. © 2010 Elsevier Ltd.
Keyword Iron oxidation species
Galvanic interaction
Grinding
Base metal sulphide mineral
TOF-SIMS evidence
Tails
Flotation
Pyrite
Galena
Media
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 1 May, 2010.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2011 Collection
 
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Created: Sun, 08 Aug 2010, 00:06:18 EST