P_（507）萃淋树脂分离稀土元素的研究（Ⅴ）──重稀土元素Er－Tm－Yb—Lu的分离

Separation of the Rare Earths Using P_(507) Levextrel Resin (Ⅴ) ──Separation of Heavy Rare Earth Er,Tm, Yb and Lu

在研究ＨＣｌ体系中Ｅｒ（Ⅲ）、Ｔｍ（Ⅲ）、Ｙｂ（Ⅲ）、Ｌｕ（Ⅲ）离子在Ｐ５０７萃淋树脂淋洗行为的基础上，发现Ｅｒ、Ｔｍ、Ｙｂ、Ｌｕ各元素的分配系数ｋｄ随酸度增高而递减，各相邻元素分离系数的平均值分别为，在色谱柱的淋洗过程中，按原子序数从小到大顺序被洗脱．用１．０～４．０ｍｏｌ／ＬＨＣｌ进行阶梯淋洗，进料量１．０％～１．５％均能达到基线分离．在色谱柱床中，ＲＥ３＋离子与Ｐ５０７发生化学反应，生成的化合物可认为是ＲＥＡ３．

The levextrel behavior of Er(Ⅲ),Tm(Ⅲ),Yb(Ⅲ) and Lu(Ⅲ) in HCl solution has been studied using a chromatographic column with P507 levextrel resin. It is found that the distribution coefficient (kd)of Er, Tm, Yb and Lu decreases with the decrease in the acidity and the adjacent element separation coefficient, and is 2.29, 2.25 and 1.59, respectively, and that theions are eluted in the order of the atomic number and the baseline separation is achieved through the eluent of 1.0￣4.0 mol/L HCl and the feed proportion of 1.0%￣1.5%. Moreover, the product due to the reaction of RE3+ to P507 can be considered as REA3.