DGA抽出剤を用いる多段抽出法による希土類元素の相互分離

Mutual separation of lanthanides by multi-stage extraction using TODGA

佐々木 祐二  ; 松宮 正彦*

Sasaki, Yuji; Matsumiya, Masahiko*

DGA(ジグリコールアミド)化合物は硝酸溶液から希土類元素を抽出し、その分配比は高い。さらに軽希土類元素と重希土類元素との相互分離比が比較的高く、相互分離テーマに都合の良い化合物である。一方、相互分離比が十分に高くないので、バッチ式の多段抽出を行いNdとDyの回収率を求めた。実験と計算結果の比較を行い、計算の有効性を確かめた。

DGA (diglycolamide) compounds can extract lanthanide (Ln) elements in nitric acid and shows the high D(Ln). The separation factors (SF) between light and heavy Ln are relatively high, thus the mutual separation of Ln can be easily done by DGA compounds. On the other hand, their SF is not so high, the separation and recovery between Nd and Dy are performed using batchwise multi-step extraction. In this work, calculation results are compared with the experiments, and its effect is confirmed.