Insight into leaching rare earth from ion-adsorption type rare earth ores with citric acid:Performance,kinetic analysis and differentiation leaching  

作　　者：Mengfei Zhao Zedong Teng Xingyu Ma Xiaoliang Jiang Hualin Zhang Youming Yang Tinggang Li 

机构地区：[1]Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou,341000,China [2]Key Laboratory of Rare Earths,jiangxi Institute of Rare Earths,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou,341119,China [3]CAS Key Laboratory of Green Process and Engineering,Innovation Academy for Green Manufacture,National Engineering Research Center of Green Recycling for Strategic Metal Resources,Beijing Engineering Research Centre of Process Pollution Control,Institute of Process Engineering,Chinese Academy ofSciences,Beijing,100190,China [4]state Key Laboratory of Biochemical Engineering,Key Laboratory of Biopharmaceutical Preparation and Delivery,Chinese Academy of Sciences,Beijing,100190,China [5]University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Journal of Rare Earths》2025年第3期591-602,I0007,共13页稀土学报(英文版)

基　　金：Project supported by the Thousand Talents Program of Jiangxi Province,China(JXSQ2023201003);National Natural Science Foundation of China(42107254);Science and Technology Major Program of Ordos City(2022EEDSKJZDZX014-2);Technological Innovation Guidance Program of Jiangxi Province(20212BDH81029);Rare Earth Industry Fund(IAGM2020DB06);Selfdeployed Projects of Ganjiang Innovation Academy,Chinese Academy of Sciences(E055A01);the Key Research Program of the Chinese Academy of Sciences(ZDRW-CN-2021-3-3)。

摘　　要：The rare earth elements(REEs)extraction by chemical leaching from ion-adsorption type rare earth ores(IAREO)has led to serious ecological and environmental risks.Conversely,demand for bioleaching is on the rise with the advantage of being environmental-friendly.As one of the organic acids produced by biological metabolism,citric acid was used to leach REEs and explore the performance and process.The results demonstrate that citric acid exhibits higher leaching efficiency(96.00%)for REEs at a relatively low concentration of 0.01 mol/L compared with(NH_(4))_(2)SO_(4)(84.29%,0.1 mol/L)and MgSO_(4)(83.99%,0.1 mol/L).Citric acid shows a preference for leaching heavy rare earth elements,with 99%leaching efficiency in IAREO,which shows higher capacity than(NH_(4))_(2)SO_(4)and MgSO_(4)(as inorganic leaching agents).Kinetic analysis indicates that the leaching process of REEs with citric acid is controlled by both the internal diffusion kinetics and chemical reaction kinetics,which is different from inorganic leaching agents.Visual Minteq calculations confirm that RE-Citrate is the main constituent of the extract solution in the leaching process of the IAREO,thereby enhancing the leaching efficiency of REEs from the IAREO.It suggests that citric acid may be used as a promising organic leaching agent for the environmentalfriendly extraction of REEs from IAREO.

关 键 词：Ion-adsorption type rare earth ores Rare earths Citric acid COMPLEXATION Organic acid Differential leaching 

分 类 号：TF845[冶金工程—有色金属冶金]