界面耦合的PbSO_(4)溶解和PbS沉淀及其对铅矾硫化浮选的影响  

Interface-coupled PbSO_(4) dissolution and PbS precipitation and its effect on sulfidization flotation of anglesite

作　　者：李佳磊[1] 李广利 刘志成 宁帅 刘瑞增 Jia-ei LI;Guang-i LI;Zhi-cheng LIU;Shuai NING;Rui-zeng LIU(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Chihong Zn&Ge Co.,Ltd.,Qujing 655000,China;Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources,Kunming 650093,China)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093 [2]云南驰宏锌锗股份有限公司,曲靖655000 [3]云南省战略金属矿产资源绿色分离与富集重点实验室,昆明650093

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第11期3503-3513,共11页中国有色金属学报（英文版）

基　　金：The authors sincerely thank the Analysis and Testing Foundation of Kunming University of Science and Technology,China(No.2018M20162101102).

摘　　要：通过浮选试验、X射线光电子能谱(XPS)、场发射扫描电子显微镜(FESEM)、拉曼光谱和紫外-可见漫反射光谱(UV-VisDRS)系统研究铅矾浮选中的硫化机理。浮选试验证明硫化钠对铅矾浮选具有活化作用;但必须控制硫化钠浓度,以避免过量硫离子对浮选的抑制。XPS、拉曼光谱和UV-VisDRS结果表明,用硫化钠水溶液处理铅矾时,PbSO_(4)被PbS取代。FESEM观察结果显示硫化过程中PbSO_(4)的溶解和PbS纳米粒子的沉淀。因此,可认为铅矾与硫化钠水溶液的反应是通过界面耦合溶解–沉淀机制进行的:在与硫化钠水溶液接触时,铅矾溶解将Pb^(2+)和SO_(4)^(2-)释放到流体边界层中,该流体边界层相对于PbS相变得过饱和;然后,PbS纳米粒子在铅矾表面成核并生长。生长在铅矾表面的PbS纳米颗粒可以提高铅矾的可浮性。Anglesite sulfidization mechanism was systematically investigated using flotation tests,X-ray photoelectron spectroscopy(XPS),field-emission scanning electron microscopy(FESEM),Raman spectroscopy,and ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS).The activation effect of sodium sulfide on anglesite flotation was demonstrated by the flotation tests;however,sodium sulfide concentration must be properly controlled to avoid excessive sulfide ions causing flotation depression.The results of XPS,Raman,and UV-Vis DRS revealed that PbSO_(4) was replaced by PbS during anglesite treatment with a sodium sulfide aqueous solution.FESEM imaging shows the dissolution of PbSO_(4) and the precipitation of PbS nanoparticles during sulfidization.Thus,it can be suggested that the reaction of anglesite with a sodium sulfide aqueous solution proceeds via an interface-coupled dissolution–precipitation mechanism:upon contact with a sodium sulfide aqueous solution,anglesite dissolution releases Pb^(2+)and SO_(4)^(2-)into the fluid boundary layer,which becomes oversaturated with respect to PbS phase;then the PbS nanoparticles nucleate and grow on the surface of anglesite.The PbS nanoparticles grown on anglesite can improve the floatability of anglesite.

关 键 词：铅矾 硫酸铅 硫化铅 硫化机理 浮选 溶解 沉淀 

分 类 号：TD952[矿业工程—选矿] TD923