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Minerals 2017, 7(11), 223; https://doi.org/10.3390/min7110223

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

1
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
2
Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
3
Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China
4
Mineral Processing Engineering Department, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey
*
Authors to whom correspondence should be addressed.
Received: 23 October 2017 / Revised: 12 November 2017 / Accepted: 13 November 2017 / Published: 16 November 2017
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Abstract

A theoretical analysis was conducted to study the role of collectors and depressants in flotation, based on the extended Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, where the hydrophobic force is considered. The collector-coated hydrophilic particle and the depressant-coated hydrophobic particle are simplified to a sphere uniformly covered with respectively hydrophobic and hydrophilic nanometer-sized hemispherical asperities of identical radius. Results show that the role of a collector in bubble–particle attachment is to create an attractive hydrophobic force and thus overcome the repulsive van der Waals and electrostatic forces. Moreover, increasing the length of the hydrophobic part of the collector molecule is a more effective way to enhance flotation recovery, compared to increasing the collector concentration. For a depressant, however, its function mechanism is to create a strong electrostatic double-layer force, while the suppression of the hydrophobic force plays a secondary role in decreasing the bubble–particle attachment barrier. The depressant molecule length is also a dominant parameter in designing a powerful depressant. View Full-Text
Keywords: flotation; collector; depressant; surface roughness; extended DLVO theory flotation; collector; depressant; surface roughness; extended DLVO theory
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Xing, Y.; Gui, X.; Karakas, F.; Cao, Y. Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory. Minerals 2017, 7, 223.

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