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镨钕是轻希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。Bauer曾用季铵盐为萃取剂,在水相中加氨羧络合剂的办法分离镨钕,他们虽然在单级实验中得到了较高的分离系数,但在20级逆流串级实验中只得到了92％氧化钕,因而认为络合交换萃取体系的单级分离系数虽高,但串级效果不好,及有实用价值。 我们在查明了硝酸甲基三烷基铵萃取单个希土机理的基础上,研究了硝酸甲基三烷基铵萃取镨钕的差异性,实验证明:硝酸甲基三烷基铵对镨的萃取能力比钕强,即存在着“倒
Praseodymium neodymium is a lighter and harder element in soil. In the usual extraction system, the separation factor α is generally less than 2. Bauer once used the quaternary ammonium salt as the extraction agent to separate praseodymium and neodymium in the aqueous phase by adding the ammonia-carboxy complexing agent. Although they obtained the higher separation coefficient in the single-stage experiment, in the 20-stage countercurrent cascade experiment Only 92% neodymium oxide was obtained. Therefore, it is considered that the single-stage separation coefficient of the complex exchange exchange extraction system is high, but the cascade effect is not good and has practical value. Based on the investigation of the mechanism of extraction of single rare earth by methyltrialkylammonium nitrate, we studied the difference of extraction of praseodymium and neodymium by methyltrialkylammonium nitrate. The experimental results show that the effect of methyltrialkylammonium nitrate on praseodymium Extraction ability than neodymium, that is, there is "down