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
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2022,（3）
• 所属期刊栏目: CHEMISTRY AND HYDROMETALLURGY
• 页码范围: 491-500
• 页数: 10页
• 语种: 英文

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,HNO3 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 REHA3(NO3) 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.