伯胺N1923负离子混合萃取稀土元素

本文测定了 N 1 9 2 3在p H6 的条件下对三价稀土离子的萃取,实验表 明 N 1 9 2 3作 为中性萃取剂配位于稀土原子,并且有较高的萃取率.分别选用三氯醋酸和硫氰酸根作为 阴离子,对 N 192 3作为萃取剂时两个体系的萃取行为、萃合物组成和配位数进行了测定和比较

The Extraction of Rare Earth Ions with Primary Amine N1923 and Anions

It usually belongs to the ionic association system when metal ions are extracted with amine as an extractant. In that case, the amine is preconditioned with acid and the metal ions are extracted as complex negative ions.We have studied the solvent extractive behavior of rare earth ions with alkyl primary amine N1923 as an extractant, CCl3COO- or SCN- as anion. It has been found that the extractive power is also high in the solution of pH = 6, in which N1923 acts as neutral ligand. It is different from the mechanism in the solution of pH = 4 in which the rare earth ions are extracted as complex negative ions. In addition, we compare the extractive behavior and the composition between the RE-N1923-CCl3COO- system and RE-N1923-SCN- system. The extractive power is higher in the RE-N1923-CCl3COO- system than in the RE-N1923-SCN- system. The Compositions of the extractive complex are RE(N1923)2(CCl3COO-)3(CCl3COOH)2 and RE(N1923)5(SCN-)3 respectively.