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.

通过在P227结构中引入胺基，合成了一种新型萃取剂2-乙基己基（（2-乙基己基氨基）甲基）膦酸（EEAMPA，简称HA），用于从硝酸盐中萃取分离三价稀土（REs）中等的。系统研究了萃取剂浓度、平衡时间、HNO ₃浓度、分离因素、循环再生、反萃取酸度、金属离子实际浸出液等影响因素。结果表明，EEAMPA对稀土的提取能力随着酸度的增加而降低。提出了一种可能的提取机制，提取的物质为 REHA ₃ (NO ₃) 由斜率分析法确认。萃取平衡可以比P227更快地达到。它表现出良好的化学稳定性和循环再生性。反萃取研究表明，HCl 是一种极好的反萃取剂，可以有效地从有机相中反萃取稀土。