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Minerals 2017, 7(2), 28; https://doi.org/10.3390/min7020028

The Effects of Calcium Ions on the Flotation of Sillimanite Using Dodecylammonium Chloride

1
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
2
Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Wuhan, 430070, China
3
School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
*
Author to whom correspondence should be addressed.
Academic Editor: William Skinner
Received: 3 November 2016 / Revised: 20 January 2017 / Accepted: 16 February 2017 / Published: 17 February 2017
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Abstract

The effects of Ca2+ ions on the flotation of sillimanite using dodecylammonium chloride as a collector were investigated by micro-flotation tests, zeta potential measurements, solution chemistry analysis and molecular dynamics (MD) simulation. The micro-flotation results indicated that Ca2+ ions remarkably inhibit the flotation of sillimanite in the pH range of 2.0–9.0. The point of zero charge (PZC) of sillimanite changed from 5.4 to 6.1 with the addition of Ca2+ ions. Meanwhile, the calculated concentration of RNH3+ in the sillimanite interface layer decreased in the presence of Ca2+ ions. The results of MD simulation revealed that Ca2+ ions have strong binding energy with the sillimanite (010) surface, and the binding energy of RNH3+ with sillimanite (010) surface reduced in the presence of Ca2+ ions. The conclusions drawn from the computations are in good agreement with the experimental results. View Full-Text
Keywords: calcium ions; dodecylammonium chloride; sillimanite; flotation; solution chemistry; molecular dynamics (MD) simulation calcium ions; dodecylammonium chloride; sillimanite; flotation; solution chemistry; molecular dynamics (MD) simulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Chen, Z.; Ren, Z.; Gao, H.; Lu, J.; Jin, J.; Min, F. The Effects of Calcium Ions on the Flotation of Sillimanite Using Dodecylammonium Chloride. Minerals 2017, 7, 28.

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