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Minerals 2017, 7(6), 102;

Flotation Separation of Scheelite from Fluorite Using Sodium Polyacrylate as Inhibitor

State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, China
Mineral Processing Engineering, Faculty of Land Resource Engineering, Kumming University of Science and Technology, Kunming 650093, China
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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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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