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镨钕是轻稀土中一对比较难以分离的元素。在通常的萃取体系中,分离系数α一般小于2。目前生产一般采用离子交换法,它虽可得到纯度较高的钕和镨,但速度慢,成本高。 在1966年召开的第四次国际萃取化学会议的总结中,认为相邻稀土元素的平均分离系数最高的体系是酸性苯基膦酸乙代已基[HEH(φp)]—甲苯溶液,用它从2M HCl中萃取Ce、Pm、Eu、Tb、Dy、Er、Tu、Yu、Yb,得到α平均=2.8。但对Pr、Nd来说,α一般比α平均
Praseodymium neodymium is a relatively rare earth element in the relatively difficult to separate. In the usual extraction system, the separation factor α is generally less than 2. The current production of ion exchange method generally used, although it can get higher purity neodymium and praseodymium, but the slow, high cost. In the conclusion of the Fourth International Conference on Chemical Extraction in 1966, the system with the highest average separation factor of adjacent rare earth elements was considered to be the acid phenylphosphonic acid ethylhexyl [HEH (φp)] - toluene solution, which was used Extraction of Ce, Pm, Eu, Tb, Dy, Er, Tu, Yu, Yb from 2 M HCl gave α average = 2.8. However, for Pr, Nd, α is generally more average than α