| Coordination-reduction leaching process of ion-adsorption type rare earth ore with ascorbic acid |
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| 作者姓名： | Jinfa Chen Jiang Qiu Li Huang Xin Chen Ying Yang Yanfei Xiao |
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| 作者单位： | 1. Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology;3. Key Laboratory of Ionic Rare Earth Resources and Environment,Ministry of Natural Resources;4. Key Laboratory of Testing and Tracing of Rare Earth Products for State Market Regulation |
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| 基金项目： | supported by the National Key Research and Development Project of China (2021YFC2902202,2020YFC1909002)；;the National Natural Science Foundation of China (51604128)； |
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| 摘 要： | The magnesium sulfate(MgSO4)-ascorbic acid(Vc) compound leaching technique can extract rare earth elements(REEs) existing in ion-exchangeable phase and colloidal phase from ion-adso rption type rare earth ore through the synergy effect of coordination and reduction,but its reaction process and mechanism remain unclear.In this paper,the coordination-reduction leaching mechanism was analyzed from the perspectives of leaching thermodynamics and kinetics,which provide theoretical guidance...
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| 收稿时间： | 14 March 2022 |
Coordination–reduction leaching process of ion-adsorption type rare earth ore with ascorbic acid |
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| Jinfa Chen,Jiang Qiu,Li Huang,Xin Chen,Ying Yang,Yanfei Xiao.Coordination-reduction leaching process of ion-adsorption type rare earth ore with ascorbic acid[J].Journal of Rare Earths,2023,41(8):1225-1233. |
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| Affiliation: | 1. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China;2. Ganzhou Engineering Technology Research Center of Green Metallurgy and Process Intensification, Ganzhou 341000, China;3. Key Laboratory of Ionic Rare Earth Resources and Environment, Ministry of Natural Resources, Ganzhou 341000, China;4. Key Laboratory of Testing and Tracing of Rare Earth Products for State Market Regulation, Ganzhou 341000, China;1. Rare Earth Institute, University of Science and Technology of China, Hefei, 230000, China;2. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, China;3. Jiangxi Institute of Rare Earths, Chinese Academy of Sciences, Ganzhou, 341000, China;4. School of Resources and Environment Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China;1. Research Center for Rare Earths, Micro/Nano-Functional Materials, Nanchang University, Nanchang 330031, China;2. College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China;1. Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;2. Ma''anshan Institute of Mining Research, Sino-Steel Group, Ma''anshan 243000, China;3. School of Computing, Engineering and Mathematics, University of Western Sydney, Penrith, NSW 2751, Australia;1. CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, PR China;2. Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen, 361021, PR China;3. University of Chinese Academy of Sciences, Beijing, 100039, PR China;4. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 341000, PR China;1. School of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology, Jiangxi 341000, China;2. Institute of Engineering & Research, Jiangxi University of Science and Technology, Jiangxi 341000, China;3. National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, Beijing 100088, China;4. Grirem Advanced Materials Co. Ltd., Beijing 100088, China |
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| Abstract: | The magnesium sulfate (MgSO4)–ascorbic acid (Vc) compound leaching technique can extract rare earth elements (REEs) existing in ion-exchangeable phase and colloidal phase from ion-adsorption type rare earth ore through the synergy effect of coordination and reduction, but its reaction process and mechanism remain unclear. In this paper, the coordination–reduction leaching mechanism was analyzed from the perspectives of leaching thermodynamics and kinetics, which provide theoretical guidance for the compound leaching process. In the case of neodymium, about 45% of dissolved neodymium will exist as the complex species of NdVc3(aq) in Nd–Vc–sulfate system. Based on this, it is deduced that the Gibbs free energy of the leaching reaction of ion-exchangeable phase REEs will change to a more negative value through the coordination of REEs cations and Vc anions in the MgSO4 leaching process. In addition, the Eh–pH diagrams of Ce–SO42––H2O and Fe–SO42––H2O together with the dissolution experiments confirm that the added Vc initiates the leaching process of colloidal phase REEs through reduction–dissolution reaction. Through the study of leaching kinetics, the leaching of REEs is controlled by diffusion and chemical reaction in the compound leaching system since colloidal phase REEs are leached. Therefore, the addition of Vc can shift the leaching equilibrium to a more favorable state and accelerate leaching process. The rare earth leaching efficiency of ion–exchangeable phase and colloidal phase can be effectively improved by increasing the reaction temperature, the concentrations of leaching agent and Vc, and the leaching agent acidity. |
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| Keywords: | Ion-adsorption type rare earth ore Ascorbic acid Coordination Reduction Leaching Mechanism |
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