The interaction of clay minerals with gypsum and its effects on copper-gold flotation

Cruz, Nestor, Peng, Yongjun, Wightman, Elaine and Xu, Ning (2015) The interaction of clay minerals with gypsum and its effects on copper-gold flotation. Minerals Engineering, 77 121-130. doi:10.1016/j.mineng.2015.03.010


Author Cruz, Nestor
Peng, Yongjun
Wightman, Elaine
Xu, Ning
Title The interaction of clay minerals with gypsum and its effects on copper-gold flotation
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
1872-9444
Publication date 2015-06-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.mineng.2015.03.010
Open Access Status Not Open Access
Volume 77
Start page 121
End page 130
Total pages 10
Place of publication Kidlington, Oxford United Kingdom
Publisher Elsevier
Language eng
Abstract The interaction of two clay minerals, kaolinite and bentonite with gypsum and its effects on the flotation of a copper–gold ore was investigated in this study. It was found that bentonite increased the viscosity more than kaolinite when mixed with the copper–gold ore at low shear rates. The detrimental effect of these clay minerals on flotation was attributed to the entrainment of clay particles when kaolinite was added to the ore and to a decrease in true flotation by bentonite. Bentonite formed a sponge-like structure with predominant edge–edge (E–E) interactions which might affect hydrodynamics in the flotation cell and have a detrimental effect on flotation recovery. Kaolinite did not form a particular network structure and its aggregates mostly consisted of face–face (F–F) type associations which did not affect flotation hydrodynamics. The addition of gypsum to the ore–bentonite mixture inhibited the formation of interconnected network structures. This led to lower viscosity values with flotation behaviour similar to that of mixtures with kaolinite. In this case, there was an improvement in recovery, but the grade decreased due to entrainment. The addition of gypsum to the ore–kaolinite mixture created aggregates with long strings further enhancing particle entrainment with more mass transported to the froth.
Keyword Kaolinite
Sodium bentonite
Gypsum
Rheology
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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