Slime coating of kaolinite on chalcopyrite in saline water flotation
来源期刊：International Journal of Minerals Metallurgy and Materials2018年第5期
论文作者：Zhi-li Li Feng Rao Shao-xian Song Yan-mei Li Wen-biao Liu
文章页码：481 - 488
摘 要：In saline water flotation, the salinity can cause a distinguishable slime coating of clay minerals on chalcopyrite particles through its effect on their electrical double layers in aqueous solutions. In this work, kaolinite was used as a representative clay mineral for studying slime coating during chalcopyrite flotation. The flotation of chalcopyrite in the presence and absence of kaolinite in tap water, seawater, and gypsum-saturated water and the stability of chalcopyrite and kaolinite particles in slurries are presented. Zeta-potential distributions and scanning electron microscopy images were used to characterize and explain the different slime coating degrees and the different flotation performances. Kaolinite particles induced slime coating on chalcopyrite surfaces and reduced chalcopyrite floatability to the greatest extent when the p H value was in the alkaline range. At 0.24 wt% of kaolinite, the chalcopyrite floatability was depressed by more than 10% at alkaline p H levels in tap water. Salinity in seawater and gypsum-saturated water compressed the electrical double layers and resulted in extensive slime coating.
Zhi-li Li1,2，Feng Rao1，Shao-xian Song2，Yan-mei Li3，Wen-biao Liu4
1. CONACYT Instituto de Investigación en Metalurgiay Materiales,Universidad Michoacana de San Nicolás de Hidalgo2. School of Resources and Environmental Engineering,Wuhan University of Technology3. Departamento de Ingeniería en Minas,Metalurgia y Geología,Universidad de Guanajuato4. Faculty of Land and Resource Engineering,Kunming University of Science and Technology
摘 要：In saline water flotation, the salinity can cause a distinguishable slime coating of clay minerals on chalcopyrite particles through its effect on their electrical double layers in aqueous solutions. In this work, kaolinite was used as a representative clay mineral for studying slime coating during chalcopyrite flotation. The flotation of chalcopyrite in the presence and absence of kaolinite in tap water, seawater, and gypsum-saturated water and the stability of chalcopyrite and kaolinite particles in slurries are presented. Zeta-potential distributions and scanning electron microscopy images were used to characterize and explain the different slime coating degrees and the different flotation performances. Kaolinite particles induced slime coating on chalcopyrite surfaces and reduced chalcopyrite floatability to the greatest extent when the p H value was in the alkaline range. At 0.24 wt% of kaolinite, the chalcopyrite floatability was depressed by more than 10% at alkaline p H levels in tap water. Salinity in seawater and gypsum-saturated water compressed the electrical double layers and resulted in extensive slime coating.
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