铌钽矿酸浸过程中表面微观结构表征  

Study on Surface Structure of Niobium-Tantalum Ore during Acid Leaching

作　　者：李秋菊[1] 王丹[2] 周仓 张继新 LI Qiu-ju;WANG Dan;ZHOU Cang;ZHANG Ji-xin(State Key Laboratory of Advanced Special Steels,Shanghai University,Shanghai 200444,China;Key Laboratory of Modern Metallurgy and Material Preparation,Shanghai University,Shanghai 200444,China;School of Material Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]上海大学上海市钢铁冶金新技术开发应用重点实验室,上海200444 [3]上海大学材料科学与工程学院,上海200444

出　　处：《有色金属（冶炼部分）》2021年第1期61-66,共6页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51974185)。

摘　　要：研究铌钽铁锰矿(Fe,Mn)(Nb,Ta)2O6在酸浸过程中界面结构及组成变化。探索复杂铌钽矿物元素选择性浸出机理,实现铌钽复合矿的高效资源化利用。通过金相显微镜结合XRD研究了铌、钽在矿中的赋存特性,分析了酸浸前、后的铌钽铁锰矿相变化。利用EDS对微区元素含量进行分析,获得矿物在酸浸前后表面宏观结构的变化以及表面元素含量的变化。XPS结合ICP检测结果分析酸浸前后铌钽矿物表面各元素化学价态及其化学键合状态的变化,确定了铌钽矿酸浸过程中各元素的选择性溶解。H2SO4酸浸时,矿物表面结构发生了Me—O转化为Me—SO4的变化,结合不同Me元素的Me—O和Me—SO4电子结合能大小以及ICP结果确定了不同化学状态元素在酸中溶解的由难到易的顺序为:Fe3+—O→Fe2+—O→Mn2+—O→Ta5+—O→Nb5+—O。(Fe,Mn)(Nb,Ta)2O6 were used as raw materials to study surface structure changes of niobium-tantalum ore under acid leaching conditions.Selective leaching of complex niobium-tantalum mineral was revealed which realized efficient resource utilization of niobium-tantalum ore.Structural modifications and elements distribution of columbite surfaces were studied by means of metallographic microscope,XRD and EDS.The change of chemical valence state and chemical bonding state of each element on surface of (Fe,Mn)(Nb,Ta)2O6 before and after acid leaching were analyzed by XPS.Combined with the results of ICP detection,selective dissolution of various elements in acid leaching process were obtained.The results before and after (Fe,Mn)(Nb,Ta)2O6 acid leaching indicate that change of Me—O to Me—SO4occurred in surface structure of minerals.Combination of Me—O and Me—SO4electron binding energy and ICP results can predict elements solution sequence,which sequence from difficulty to easiness is Fe3+—O→Fe2+—O→Mn2+—O→Ta5+—O→Nb5+—O.

关 键 词：铌钽铁锰矿 酸浸 表面结构 表面化学状态 溶解顺序 

分 类 号：TF841.6[冶金工程—有色金属冶金]