Extraktion von Seltenen Erden mit Tri-n-butylphosphinoxid

摘要

The extraction of Pr, Gd, and Yb with tri-n-butylphosphineoxide in nitric acid and perchloric acid medium has been investigated. The nitrates of Pr, Gd, and Yb form trisolvates in the organic phase, whereas the perchlorates of Pr and Gd give pentasolvates. Besides the pentasolvate, Yb perchlorate forms presumably a tetrasolvate as well. The results obtained are interpreted by the inclusion of one or two perchlorate ions in the inner coordination sphere.