Slime coating of kaolinite on chalcopyrite in saline water flotation

Zhi-li Li; Feng Rao; Shao-xian Song; Yan-mei Li; Wen-biao Liu

doi:10.1007/s12613-018-1594-7

Volume 25 Issue 5

May 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(5): 481-488

Zhi-li Li, Feng Rao, Shao-xian Song, Yan-mei Li, and Wen-biao Liu, Slime coating of kaolinite on chalcopyrite in saline water flotation, Int. J. Miner. Metall. Mater., 25(2018), No. 5, pp. 481-488. https://doi.org/10.1007/s12613-018-1594-7

Cite this article as:

Zhi-li Li, Feng Rao, Shao-xian Song, Yan-mei Li, and Wen-biao Liu, Slime coating of kaolinite on chalcopyrite in saline water flotation, Int. J. Miner. Metall. Mater., 25(2018), No. 5, pp. 481-488. https://doi.org/10.1007/s12613-018-1594-7

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Research Article

Slime coating of kaolinite on chalcopyrite in saline water flotation

+ Author Affiliations

Corresponding author:
Feng Rao E-mail: fengrao@umich.mx
Received: 24 August 2017; Revised: 22 November 2017; Accepted: 8 December 2017

Abstract

Abstract

In saline water flotation, the salinity can cause a distinguishable slime coating of clay minerals on chalcopyrite particles through its effect on their electrical double layers in aqueous solutions. In this work, kaolinite was used as a representative clay mineral for studying slime coating during chalcopyrite flotation. The flotation of chalcopyrite in the presence and absence of kaolinite in tap water, seawater, and gypsum-saturated water and the stability of chalcopyrite and kaolinite particles in slurries are presented. Zeta-potential distributions and scanning electron microscopy images were used to characterize and explain the different slime coating degrees and the different flotation performances. Kaolinite particles induced slime coating on chalcopyrite surfaces and reduced chalcopyrite floatability to the greatest extent when the pH value was in the alkaline range. At 0.24wt% of kaolinite, the chalcopyrite floatability was depressed by more than 10% at alkaline pH levels in tap water. Salinity in seawater and gypsum-saturated water compressed the electrical double layers and resulted in extensive slime coating.
- chalcopyrite;
- clay minerals;
- saline water flotation;
- slime coating;
- stability

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