Group Extraction of the Rare-Earth Elements by Alkyl Phosphine Oxides of the Hexyl–Octyl Series

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Abstract

Samples of monoalkyl and mixed-alkyl phosphine oxides of the hexyl–octyl series were synthesized previously by the Grignard method. Here, the group extraction of rare-earth metals contained simultaneously in their nitrate solutions has been studied using then-synthesized alkyl phosphine oxides. Extraction isotherms for the recovery of the total of lanthanides, scandium, and thorium from nitrate solutions have been obtained. Trihexyl phosphine oxide (THPO) exhibits the highest efficiency under these conditions. Trioctyl phosphine oxide (TOPO) exhibits the best selectivity to heavy-group lanthanides, which makes it useful for the recovery of the heavy-group lanthanide fraction. In addition, scandium and thorium were extracted completely, which in turn indicates the usefulness of phosphine oxides for their extraction. The separation factors have been determined for the entire lanthanides series.

About the authors

V. V. Tumanov

Luch Research and Production Association

Email: neijivlad@mail.ru
142100, Podolsk, Moscow oblast, Russia

P. A. Storozhenko

State Research Institute of Chemistry and Technology of Organoelement Compounds

Email: neijivlad@mail.ru
105118, Moscow, Russia

A. A. Grachev

State Research Institute of Chemistry and Technology of Organoelement Compounds

Email: neijivlad@mail.ru
105118, Moscow, Russia

O. I. Fedin

Luch Research and Production Association

Author for correspondence.
Email: neijivlad@mail.ru
142100, Podolsk, Moscow oblast, Russia

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