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

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. Extr...

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Bibliographic Details
Published inRussian journal of inorganic chemistry Vol. 68; no. 4; pp. 474 - 478
Main Authors Tumanov, V. V., Storozhenko, P. A., Grachev, A. A., Fedin, O. I.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.04.2023
Springer Nature B.V
Subjects
Chemistry
Chemistry and Materials Science
Inorganic Chemistry
Lanthanides
Oxides
Phosphine oxide
Physical Chemistry of Solutions
Rare earth elements
Recovery
Scandium
Synthesis
Thorium
neutral extractants
nitric acid
liquid–liquid extraction
separation factors
lanthanides
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Summary: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.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023622602902