轻稀土元素中镨钕是最难分离的一对相邻元素,有关文献报导,一般分离因数不超过2。有人曾利用季铵盐型萃取剂萃取稀土,在水相中加入氨羧络合剂,在经过多级逆流萃取后可制备较纯的镨钕。在此篇报告中,我们尝试了用硅球作为载体,用N_(263)为固定相,并在流动相中加入二乙撑三胺五乙酸(DTPA),利用N_(263)与轻稀土络合的“倒序”现象和DTPA的“顺序”现象,形成一个柱上的 Light rare earth elements praseodymium neodymium is the most difficult to separate a pair of adjacent elements, the literature reported that the general separation factor does not exceed 2. Some people have used quaternary ammonium extractant rare earth extraction, in the aqueous phase by adding ammonia complexing agent, after multi-stage countercurrent extraction can be prepared more pure praseodymium neodymium. In this report, we have attempted to use silica spheres as carrier, N_ (263) as stationary phase, and diethylenetriaminepentaacetic acid (DTPA) as mobile phase, and use N_ (263) Combined “reverse” phenomenon and DTPA “order” phenomenon, forming a pillar