Investigation on the Use of the Weakly Basic Polyacrylate Anion-Exchanger Amberlite IRA-68 for Sorption and Separation of Im-inodiacetate Complexes of Rare Earth Elements

摘要

Based on the determined affinity series of rare earth element complexes with IMDA for the anion-ex-changers, purification of macroquantities of Nd~(3+) from Y~(3+), Sm~(3+) from Ho~(3+), La~(3+) from Nd~(3+) and La~(3+) from Pr~(3+) on the weakly basic gel anion-exchanger Amberlite IRA-68 was studied. Using the presented method on 1 L of Amberlite IRA-68 in the acetate form, it is possible to obtain about 240 g Nd_2O_3 purified from Y_2O_3. Great difference in affinity of La~(3+) and Nd~(3+) as well as Pr~(3+) complexes for this anion-exchanger in the acetate form indicates the possibility of applying this process for purification of lanthanum on the increased scale. On 1 L of Amberilte IRA-68 in the acetate form it is possible to obtain about 1125 g La_2O_3 purified from Nd_2O_3. On the basis of these results it can be assumed that unique properties of polyacrylate anion-exchangers enable their application for separation of rare earth elements.