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Minerals 2017, 7(6), 102; doi:10.3390/min7060102

Flotation Separation of Scheelite from Fluorite Using Sodium Polyacrylate as Inhibitor

1
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, China
2
Mineral Processing Engineering, Faculty of Land Resource Engineering, Kumming University of Science and Technology, Kunming 650093, China
3
Mineral Processing Engineering, School of Minerals Processing and Bio-Engineering, Changsha 410083, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Kota Hanumantha Rao
Received: 21 April 2017 / Revised: 12 June 2017 / Accepted: 14 June 2017 / Published: 16 June 2017
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Abstract

The depressing properties of sodium polyacrylate (PA-Na) for scheelite and fluorite were studied by micro-flotation tests, infrared spectroscopy (IR), zeta potentials, X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT). The flotation results reveal that the selective depression effect of PA-Na is better than that of sodium silicate, and PA-Na can depress fluorite more effectively than scheelite. The flotation recovery of scheelite and fluorite keeps at about 75% and 10%, respectively, at the pulp pH 9.3~9.6 and PA-Na concentration from 30 to 50 mg/L. IR spectra results suggest that PA-Na has a chemical effect on the surface of scheelite and fluorite. The zeta potential of fluorite becomes more negative than that of scheelite after PA-Na addition. XPS analysis deduces the occurrence of chemisorption between PA-Na and mineral surfaces, and the chemisorption of PA-Na on fluorite is stronger than on scheelite. DFT demonstrates that the absolute value of the adsorption energy in the presence of PA-Na is larger on the fluorite {111} surface than on the scheelite {111} surface. Thus, fluorite is more readily depressed than scheelite, which remarkably matches the micro-flotation test results. View Full-Text
Keywords: scheelite; fluorite; flotation; sodium polyacrylate; selective inhibition scheelite; fluorite; flotation; sodium polyacrylate; selective inhibition
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Zhang, Y.; Li, Y.; Chen, R.; Wang, Y.; Deng, J.; Luo, X. Flotation Separation of Scheelite from Fluorite Using Sodium Polyacrylate as Inhibitor. Minerals 2017, 7, 102.

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