Electrochemistry and DFT study of galvanic interaction on the surface of monoclinic pyrrhotite(001)and galena(100)  

作　　者：Tingsheng Qiu Kaiwei Ding Huashan Yan Liu Yang Hao Wu Guanfei Zhao Xianhui Qiu 

机构地区：[1]College of Resource and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China [2]Jiangxi Provincial Key Laboratory of Low-Carbon Processing and Utilization of Strategic Metal Mineral Resources,Ganzhou 341000,China [3]Jiangxi Environmental Engineering Vocational College,Ganzhou 341000,China

出　　处：《International Journal of Mining Science and Technology》2024年第8期1151-1162,共12页矿业科学技术学报（英文版）

基　　金：supported by the National Key Research and Development Program Project(No.2022YFC2904504).

摘　　要：The electrochemical interaction between galena and monoclinic pyrrhotite was investigated to examine its impact on the physical and chemical properties of the mineral micro-surface.This investigation employed techniques such as electrochemistry,metal ion stripping,X-ray photoelectron spectroscopy,and quantum chemistry.The electrochemical test results demonstrate that the galena surface in the electro-couple system exhibits a lower electrostatic potential and higher electrochemical activity compared to the monoclinic pyrrhotite surface,rendering it more susceptible to oxidation dissolution.Monoclinic pyrrhotite significantly amplifies the corrosion rate of the galena surface.Mulliken charge population calculations indicate that electrons are consistently transferred from galena to monoclinic pyrrhotite,with the number of electron transfers on the mineral surface increasing as the interaction distance decreases.The analysis of state density revealed a shift in the surface state density of galena towards lower energy levels,resulting in decreased reactivity and increased difficulty for the reagent to adsorb onto the mineral surface.Conversely,monoclinic pyrrhotite exhibited an opposite trend.The X-ray photoelectron spectroscopy(XPS)test results indicate that galvanic interaction leads to the formation of hydrophilic substances,PbS_(x)O_(y) and Pb(OH)_(2),on the surface of galena.Additionally,the surface of monoclinic pyrrhotite not only adsorbs Pb^(2+)but also undergoes S^(0) formation,thereby augmenting its hydrophobic nature.

关 键 词：ELECTROCHEMISTRY Galvanic interaction Monoclinic pyrrhotite GALENA Density functional theory 

分 类 号：TD95[矿业工程—选矿]