Separation of trivalent rare earths from nitrate medium using solvent extraction with a novel extractant 2-ethylhexyl((2-ethylhexylamino)methyl)phosphonic acid

作     者：Yongmei Fu Mingxia Huang Zhulin Zhou Zhongjun Li Wuping Liao Youcai Lu Yongmei Fu;Mingxia Huang;Zhulin Zhou;Zhongjun Li;Wuping Liao;Youcai Lu

作者机构：Green Catalysis Centerand College of ChemistryZhengzhou UniversityZhengzhou 450001China State Key Laboratory of Rare Earth Resource UtilizationChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2022年第40卷第3期

页      面：491-500,I0005页

核心收录：

学科分类：080603[工学-有色金属冶金] 0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0806[工学-冶金工程] 0708[理学-地球物理学] 0703[理学-化学] 

基　　金：Project supported by the National Natural Science Foundation of China(21701146) the National Science Foundation for Post-doctoral Scientists of China(2018M632798) the Open Funds of the State Key Laboratory of Rare Earth Resource(RERU2017019)。 

主　　题：Rare eartn Extraction Separation α-aminophosphonic acid Extractant 

摘      要：By introducing the amine group into the structure of P227,a novel extractant 2-ethylhexyl((2-ethylhexylamino)methyl)phosphonic acid(EEAMPA,abbreviated as HA)was synthesized for the extraction and separation of trivalent rare earths(REs)from nitrate medium.The influence factors including extractant concentration,equilibrium time,HNO_(3)concentration,separation factors,cycle regeneration,stripping acidity,and actual leach liquor of metal ions,were studied systematically.The results show that the extraction ability of EEAMPA for REs decreases with increasing acidity.A possible extraction mechanism is proposed and the extracted species as REHA_(3)(NO_(3))are confirmed by the slope analysis method.The extraction equilibrium can reach faster than P227.It shows good chemical stability and cycling regeneration.Stripping studies show that HCl is an excellent stripping agent and REs can be effectively stripped from the organic phase.