Impact of chalcopyrite depression by water-borne bacteria in pure and combined mineral systems

Liu, Wenying, Moran, C. J. and Vink, Sue (2013) Impact of chalcopyrite depression by water-borne bacteria in pure and combined mineral systems. International Journal of Mineral Processing, 123 18-24. doi:10.1016/j.minpro.2013.04.017


Author Liu, Wenying
Moran, C. J.
Vink, Sue
Title Impact of chalcopyrite depression by water-borne bacteria in pure and combined mineral systems
Journal name International Journal of Mineral Processing   Check publisher's open access policy
ISSN 0301-7516
Publication date 2013-09
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.minpro.2013.04.017
Volume 123
Start page 18
End page 24
Total pages 7
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Collection year 2014
Language eng
Formatted abstract
There is a general trend towards more responsible water management across the minerals industry. Two important strategies have been implementation of water reuse and sourcing of alternative water supplies that otherwise would have been disposed of, such as treated effluent. Both strategies have been shown to result in increased inorganic and organic loads (including bacteria) in mineral processing, in particular, froth flotation. A number of studies have shown the effect of inorganic water constituents on the performance of flotation. However, far less is known about the impacts and processes associated with organic constituents, particularly bacteria. This study investigated the quantitative relationship between bacterial concentration in flotation water using E. coli as the model bacterium and the flotation performance of chalcopyrite. Flotation tests were carried out to quantify the effect of E. coli cells on the flotation of three chalcopyrite-containing systems of increasing complexity: high-purity chalcopyrite, a simulated ore with controlled gangue, and a porphyry copper-gold ore. The experimental results show that E. coli cells negatively affected the flotation efficiency of chalcopyrite in all three systems. The bacterial cells also negatively affected the flotation efficiency of pyrite in the simulated ore system, and gold in the porphyry ore system. The bacterial cells preferentially attached to pyrite over chalcopyrite in the simulated ore system. Findings in this study contribute to identifying some of the potential risks posed by using bacteria-containing water for flotation, when attempting to improve water efficiency.
Keyword Flotation
Bacteria
Chalcopyrite
Pyrite
Gold
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Water in the Minerals Industry
Official 2014 Collection
 
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