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Minerals 2018, 8(4), 149; https://doi.org/10.3390/min8040149

Developing Effective Separation of Feldspar and Quartz While Recycling Tailwater by HF Pretreatment

1
Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Mianyang 621010, China
2
Research Center of Multipurpose Utilization of Metal Mineral Resources of China Geological Survey, Chengdu 610000, China
3
School of Resource and Civil Engineering, Wuhan Institute of Technology, Wuhan 430073, China
*
Author to whom correspondence should be addressed.
Received: 23 February 2018 / Revised: 2 April 2018 / Accepted: 5 April 2018 / Published: 11 April 2018
(This article belongs to the Special Issue Sustainable Mineral Processing Technologies)
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Abstract

The effect of hydrofluoric acid (HF) pretreatment on flotation of feldspar and quartz using dodecylamine (DDA) as collector was investigated by micro-flotation, zeta potential, pyrene fluorescence spectroscopy, attenuated total reflection flourier transformed infrared spectroscopy (ATR-FTIR), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and bench scale flotation. The micro-flotation tests revealed that there was little difference in the flotation of feldspar and quartz at pH 2, using H2SO4 as pH regulator. After HF pretreatment, the floatability of feldspar significantly increased while the floatability of quartz showed no change. HF pretreatment resulted in leaching of SiO2 and enrichment of Na, K and Al on the feldspar surface. Consequently, the negative surface charge of feldspar increased at pH 2, which allowed for the flotation separation of the feasible minerals. This took place via an increased electrostatic adsorption between DDA and Na, K, Al on the feldspar surface, which effectively increased its hydrophobicity and as a result, improved the floatability of feldspar. An alternative process which exhibited effective separation of quartz and feldspar while recycling the tailwater from the flotation was proposed. View Full-Text
Keywords: hydrofluoric acid; flotation; DDA; ATR-FTIR hydrofluoric acid; flotation; DDA; ATR-FTIR
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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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Wang, W.; Cong, J.; Deng, J.; Weng, X.; Lin, Y.; Huang, Y.; Peng, T. Developing Effective Separation of Feldspar and Quartz While Recycling Tailwater by HF Pretreatment. Minerals 2018, 8, 149.

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