ammonium salt as a collector and its adsorption mechanism  

作　　者：Wei Xu Guangjun Mei Yan Tian Bo Shi Can Guo Weixiao Pan 

机构地区：[1]School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China [2]Technology Innovation Center for Comprehensive Utilization of Strategic Mineral Resources,Ministry of Natural Resources,Chengdu 610041,China [3]State Key Laboratory of Efficient Utilization for Low-Grade Phosphate Rock and Its Associated Resources,Guiyang 550016,China

出　　处：《Green and Smart Mining Engineering》2024年第3期322-335,共14页绿色与智能矿业工程（英文）

基　　金：supported by Open Foundation of Technology Innovation Center for Comprehensive Utilization of Strategic Mineral Resources,Ministry of Natural Resources of China(No.CCUM-KY-2310);Science and Technology Program of Guizhou Province,China(Qiankehe support(2020)2Y048).

摘　　要：A novel quaternary ammonium salt collector,LH-01,was employed for the reverse cationic flotation of a magnesium-depleted concentrate(P2O5 grade of 19.72wt%,SiO2 content of 44.26wt%).We achieved an outstanding phosphate concentrate with a P2O5 grade of 35.16wt%,a SiO2 content of 6.06wt%,and a P2O5 recovery of 75.88%.This process was accomplished through two sequential reverse cationic flotation processes designed for quartz removal.Importantly,the quartz removal by LH-01 reached 94.17%,far superior to that by dodecyltrimethylammonium chloride,achieving highly selective separation of quartz and apatite.To understand the adsorption mechanism and kinetics of the collector LH-01 on quartz and apatite surfaces,various techniques,such as quartz crystal microbalance with dissipation,atomic force microscopy,and X-ray photoelectron spectroscopy,were employed.Results revealed that the adsorption layer of LH-01 on the apatite surface was thin and rigid,with a significantly lower hydrophobic effect than that of the viscoelastic multiple adsorption layer formed by LH-01 on the quartz surface.This disparity was identified as the primary factor contributing to the selective flotation separation of apatite and quartz.Moreover,the adsorption of LH-01 on the quartz surface was the result of multiple forces,including electrostatic adsorption,multiple-hydrogen-bond adsorption,and intermolecular hydrophobic association.

关 键 词：Calcareous-siliceous phosphate ore Quaternary ammonium salt QUARTZ Quartz crystal microbalance with dissipation Adsorption mechanism 

分 类 号：TD923.13[矿业工程—选矿] TD97