期刊
INTERNATIONAL JOURNAL OF MINERAL PROCESSING
卷 149, 期 -, 页码 84-93出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.minpro.2016.02.013
关键词
Flotation; Extended-DLVO; Fine particles; Interfacial interaction
资金
- National Science Foundation of China [51374079, 51504053]
- China Postdoctoral Science Foundation [2015M571324]
- Ph.D start up Foundation of Science and Technology Department of Liaoning Province [20151157]
- foundation of Education Department of Liaoning Province [L20150180]
The influence of fine particles on the flotation separation of minerals is becoming increasingly important as new, fine grained deposits are exploited. Fine particles float poorly and less selectively under normal flotation conditions, having detrimental effects on recovery of other minerals. The reasons of this interacting effect are complex, which may be entrainment, pH variation, dissolved ions from mineral surfaces, aggregation/dispersion and coating behavior of particles or even the competitive adsorption effect. In this study, the influence of fine magnesite and dolomite on the flotation of quartz was investigated. It was found that at pH = 92-9.5 and with DDA dosage of 8.6 x 10(-4), the recovery of coarse (-100 + 65 mu m) quartz was reduced dramatically from 96.66% to 37.15% when the content of quartz was 5% in the flotation with fine (-5 mu m) magnesite, and when the content of fine dolomite was increased from 2.5% to 20%, the recovery of coarse quartz was reduced from 91.20% to 75.08%. To examine-the reasons, zeta potential, zero point of charge and contact angles of magnesite, dolomite and quartz were measured in the absence and presence of dodecylamine (DDA). The interaction energies between particles were then calculated. Results showed that the aggregation behavior of mineral particles was likely to be the reason. Interaction energy calculated based on Extended-DLVO (Derjaguin-Landau-Verwey-Overbeek) theory predicted that in DDA surfactant solution, the interaction forces between magnesite and quartz, dolomite and quartz were attractive, between dolomite and magnesite was repulsive. The experimental results are in excellent agreement with the theoretically predicted results. The aggregation caused by interacting behavior explains the depressing effect of fine hydrophilic particles on magnesite reverse flotation. (C) 2016 Elsevier B.V. All rights reserved.
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