Journal
MINERALS ENGINEERING
Volume 127, Issue -, Pages 42-47Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2018.07.024
Keywords
Spodumene; Feldspar; Flotation; Adsorption; Mixed collectors
Funding
- National Natural Science Foundation of China [51674207, 51741408, 51734001, 51304162]
- National Postdoctoral Program for Innovative Talents [BX201700203]
- Foundation of Key Laboratory of Biohydrometallurgy, Ministry of Education [MOEKLB1707]
- China Postdoctoral Science Foundation [2017M623057]
- Ministry of Education of China [16kfgk02, 17kfgk01]
- Applied Basic Research Foundation of Sichuan Province [2018JY0148]
- Basic and Public Geology and Mineral Resources Survey Foundation of China Geological Survey [DD20160074-6]
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The flotation separation of spodumene from feldspar was investigated using a new type of mixed anionic/cationic collector, sodium oleate/tributyl tetradecyl phosphonium chloride (NaOL/TTPC). Microflotation experiments, fluorescence spectroscopy measurements, microcalorimetric analysis, and Fourier transform infrared analysis were performed. Microflotation experiments show that the highest flotation separation performance can be achieved at the NaOL:TTPC molar ratio of 5:1 at the pH of 4.0. Fluorescence spectroscopy measurements show that the critical micelle concentration (CMC) of the mixed collector NaOL/TTPC is smaller than either of its components alone. Microcalorimetric results indicate that the difference in adsorption reaction heat between spodumene and feldspar is larger for the mixed collector than either single collector, confirming the former's separation advantage. Fourier transform infrared analyses show that in the mixed collector, both NaOL and TTPC adsorb on the spodumene surface through chemical interaction and electrostatic attraction, respectively; while only trace amounts of them are adsorbed on the feldspar surface.
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