Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 29    No. 7    July 2019

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Effects of grinding environment and lattice impurities on spodumene flotation
Guang-li ZHU1,2, Yu-hua WANG1, Xu-ming WANG2, Jan D. MILLER2, Dong-fang LU1, Xia-yu ZHENG1, Yue-hao ZHAO1, Hai-tao ZHENG1

1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. College of Mines and Earth Sciences, University of Utah, Salt Lake City 84112, USA

Abstract:The effect of grinding on the spodumene flotation was investigated. The flotation response of spodumene ground by different mills was different, due to the variation of metal ions on spodumene surfaces caused by grinding environments and/or impurities. The samples were subjected to acid pickling treatment to remove most of the metal ions from the surfaces, and then all samples showed the same poor flotation response, which confirmed the significance of surface metal ions. Metal ion impurities may come from both grinding environments and lattice substitutions in spodumene. Density functional theory (DFT) calculation revealed that Fe and Ca could exist as lattice substitutions on the spodumene surface while Mg substitution is unlikely to occur. Furthermore, Fe is considered to be active site for the absorption of sodium oleate on the spodumene surface. Morphology analysis showed differences in particle size and shape for samples ground by different mills, resulting in different amounts of exposed surfaces. The particle size, cleavage characteristics caused by grinding environments, and metal ion impurities originated from grinding and isomorphous substitutions, play significant roles in the chemisorption of collector on the spodumene surface.


Key words: grinding; lattice substitution; metal ion impurities; density functional theory (DFT) calculation; spodumene; cleavage; flotation

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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