The interaction of pH modifiers with kaolinite in copper-gold flotation

Cruz, Nestor, Peng, Yongjun, Wightman, Elaine and Xu, Ning (2015) The interaction of pH modifiers with kaolinite in copper-gold flotation. Minerals Engineering, 84 27-33. doi:10.1016/j.mineng.2015.09.019

Author Cruz, Nestor
Peng, Yongjun
Wightman, Elaine
Xu, Ning
Title The interaction of pH modifiers with kaolinite in copper-gold flotation
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
Publication date 2015-12-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.mineng.2015.09.019
Open Access Status Not Open Access
Volume 84
Start page 27
End page 33
Total pages 7
Place of publication Oxford, United Kingdom
Publisher Elsevier
Collection year 2016
Language eng
Formatted abstract
The objective of this study was to assess the effect of lime and soda ash as pH modifiers on the flotation of a copper–gold ore mixed with kaolinite at different concentrations. For the flotation experiments air flow rate, impeller speed, flotation time and other flotation reagents were kept constant, and the flotation outcomes were explained by the rheology behavior of the slurries and the type of particle aggregates formed with the addition of either lime or soda ash. Rheology measurements showed that lime increased apparent viscosities more than soda ash, but in Cryo-SEM images it was observed that the kaolinite aggregates in the slurry were similar in structure for both lime and soda ash additions. These two findings suggest that Ca2+ ions released from lime led to the formation of stronger aggregates that were more easily entrained as indicated by the changes in mass recovered to concentrate during flotation experiments. As a result, more dilution of the flotation concentrate grade occurred when adjusting pH with lime. A decrease in concentrate grade was the main negative effect in the flotation of the copper–gold ore mixed with kaolinite with the overall flotation recovery not affected.
Keyword Kaolinite
Soda ash
Network structures
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
School of Chemical Engineering Publications
Official 2016 Collection
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Citation counts: TR Web of Science Citation Count  Cited 1 times in Thomson Reuters Web of Science Article | Citations
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