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 

机构地区：[1]Green Catalysis Center,and College of Chemistry,Zhengzhou University,Zhengzhou 450001,China [2]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China

出　　处：《Journal of Rare Earths》2022年第3期491-500,I0005,共11页稀土学报（英文版）

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)。

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.

关 键 词：Rare eartn Extraction SEPARATION α-aminophosphonic acid EXTRACTANT 

分 类 号：TF845[冶金工程—有色金属冶金]