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| Study on Surface Structure of Niobium-Tantalum Ore during Acid Leaching |
| Received:September 23, 2020 Revised:September 26, 2020 |
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| DOI：doi：10.3969/j.issn.1007-7545.2021.01.011 |
| KeyWord:(Fe,Mn)(Nb,Ta)2O6 mineral; acid leaching; surface structure; surface chemical state; solution sequence |
| Author | Institution |
| Li Qiu-ju |
省部共建高品质特殊钢冶金与制备国家重点实验室,上海大学;上海市钢铁冶金新技术开发应用重点实验室,上海大学;材料科学与工程学院,上海大学;材料科学与工程学院,上海大学 |
| WANG Dan |
上海市钢铁冶金新技术开发应用重点实验室,上海大学 |
| ZHOU Cang |
上海市钢铁冶金新技术开发应用重点实验室,上海大学 |
| ZHANG Ji-xin |
材料科学与工程学院,上海大学;材料科学与工程学院,上海大学 |
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| Abstract: |
| (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—SO4 occurred in surface structure of minerals. Combination of Me—O and Me—SO4 electron 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. |
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