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Open AccessArticle

Effects and Mechanism of Different Grinding Media on the Flotation Behaviors of Beryl and Spodumene

by Zhenfeng Hu 1,2,* and Chuanyao Sun 1,2,3
1
BGRIMM Technology Group, Beijing 100160, China
2
State Key Laboratory of Mineral Processing Science and Technology, Beijing 102628, China
3
Chinese Academy of Engineering, Beijing 100088, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(11), 666; https://doi.org/10.3390/min9110666
Received: 9 September 2019 / Revised: 25 October 2019 / Accepted: 27 October 2019 / Published: 29 October 2019
The flotation behavior of beryl and spodumene (typical silicate minerals) was studied at wet-grinding conditions with different grinding mediums, with dodecylamine or sodium oleate as the collector. The mechanism of potential influence of the grinding medium to the flotation behavior was investigated through measuring zeta potential of pure minerals, micro scanning by X-ray photoelectron spectroscopy (XPS), surface interaction simulation and etc. The test data suggested that, with dodecylamine as the collector and relatively lower pH, the recoveries of beryl and spodumene are higher with zircon balls as wet-grinding media than those with iron balls, while in the higher pH, the recovery difference became smaller. With sodium oleate as a collector, within the same pH environment, the recovery of beryl and spodumene under zircon ball wet-grinding is lower than those under iron wet-grinding. We observed formation of iron-hydroxyl complexes on the mineral surface after iron ball grinding, which are significant influence on the flotation behavior of silicate minerals. Furthermore, for iron wet-grinding, the iron adsorbed on the mineral surface increased the adsorption energy between laurylamine (cationic collector) and silicate minerals, which inhibited the interaction between collectors and minerals. On the other hand, the interaction energy between sodium oleate (anion collector) and silicate minerals was decreased, which promoted the interaction between collectors and minerals. View Full-Text
Keywords: grinding medium; beryl; spodumene; flotation; molecular simulation grinding medium; beryl; spodumene; flotation; molecular simulation
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Hu, Z.; Sun, C. Effects and Mechanism of Different Grinding Media on the Flotation Behaviors of Beryl and Spodumene. Minerals 2019, 9, 666.

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