Cu^(2+)与Pb^(2+)对辉锑矿浮选行为的活化机理研究  

Activation mechanisms of Cu^(2+) and Pb^(2+) in stibnite flotation

作　　者：肖有明 崔毅琦[1,2] 童雄 王靖[1] 黄典强 张洋 XIAO Youming;CUI Yiqi;TONG Xiong;WANG Jing;HUANG Dianqiang;ZHANG Yang(School of Land and Resources Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Yunnan Engineering Research Center for Metal Tailings Resource Utilization,Kunming Yunnan 650093,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]云南省金属尾矿资源利用工程研究中心,云南昆明650093

出　　处：《矿物学报》2024年第3期420-427,共8页Acta Mineralogica Sinica

基　　金：云南省重大科技项目(编号:202202AG050010)。

摘　　要：通过微浮选试验、吸附量试验以及密度泛函(DFT)计算,本文研究了Cu^(2+)、Pb^(2+)对辉锑矿浮选存在的活化差异及机理。微浮选试验表明,采用丁基黄药(BX)经Pb^(2+)活化后浮选辉锑矿回收率较Cu^(2+)活化提高了7.82%。吸附量试验显示,Pb^(2+)在辉锑矿表面作用后,其表面能够吸附更多的BX。DFT计算结果表明,经Cu^(2+)活化后BX的S1双键原子与Cu形成Cu—S键且属于得电子体系,而Pb^(2+)活化后BX的单键S1和双键S2原子与Pb形成稳定螯合结构且属于失电子体系,为黄药和氧气作用矿物表面生成双黄药供了条件,显著地提高了辉锑矿的可浮性。Different activation mechanisms of Cu2+and Pb2+stibnite flotation were studied by microflotation test,adsorption capacity tests and density functional theory(DFT).Microflotation experiments indicated that the recovery rate of stibnite flotation with butyl xanthate(BX)was activated 7.82%higher by Pb2+than Cu2+.The presence of Pb2+increased the amount of adsorbed BX on the stibnite surface.The results of DFT suggested that Cu2+activation induced the formation of Cu-S bonds between the double-bonded S1 atom of BX with Cu,resulting in electron gain.Pb2+activation was followed by the formation of a stable chelating structure between single-bond S1 and double-bond S2 atoms of BX,resulting in electron loss.This system also facilitated dixanthate formation on the mineral surface via interaction between BX and oxygen,thus improving the floatability of stibnite.

关 键 词：辉锑矿 微浮选 DFT 铜离子 铅离子 

分 类 号：P579[天文地球—矿物学] TD954[天文地球—地质学]