Non-equilibrium kinetic separation of thulium,yttrium and erbium on the surface of freely rising oil droplets  

作　　者：Na Sui Shukai Miao Kaihui Cui Fancheng Meng Kun Huang 

机构地区：[1]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing,100083,China [2]Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals,University of Science and Technology Beijing,Beijing,100083,China [3]Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing,100190,China

出　　处：《Journal of Rare Earths》2024年第1期200-209,I0007,共11页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(51904027,52074031,51574213)。

摘　　要：It is difficult to achieve selective separation and enrichment of different rare earths from high abundance yttrium ores efficiently only dependent on their discrepancy in thermodynamic properties.The present work suggests a new strategy based on non-equilibrium kinetic separation of Er and Tm on the surface of freely rising oil droplets to control the separation order of Y.It is revealed that the mutual separation of Er/Tm is significantly promoted with the separation coefficient of 2.89 during the non-equilibrium extraction with the addition of diethylenetriaminepentaacetic acid(DTPA).The extraction sequence of Tm,Er and Y can be controlled as Tm>Y>Er,thus Y can be selectively enriched during the process of separation of Er and Tm,Such a sequence is subject to the controllable dissociation rates of RE(Ⅲ)-DTPA complexes and extraction abilities of P507 with the three RE(Ⅲ)ions.The dissociation rate is dependent on the stabilities of RE(Ⅲ)-DTPA complexes and follows the sequence ofY(Ⅲ)—DTPA Er>Y to Tm>Y>Er.

关 键 词：DTPA Interface interaction Non-equilibrium kinetic separation Rare earths P507 

分 类 号：TF845[冶金工程—有色金属冶金]