Recovery and Separation of Rare and Radioactive Elements with 5-(Diphenylphosphoryl)hexan-3-one during Phosphogypsum Processing

• Published in: Radiochemistry (New York, N.Y.) Vol. 65; no. 1; pp. 52 - 58
• Main Authors: Safiulina, A. M., Semenov, A. A., Lizunov, A. V., Lesina, I. G., Goryunov, E. I., Goryunova, I. B., Bodrin, G. V., Brel’, V. K., Aksenov, S. M., Tananaev, I. G.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.02.2023; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Materials recovery; Nuclear Chemistry; Phosphogypsum; Radioisotopes; Rare earth elements; Raw materials; Separation; Thorium; Uranium; actinides; separation; organophosphorus extractants; thorium; uranium; recovery; rare earth metals; extraction; mineral and technogenic raw materials; phosphogypsum; phosphoryl ketones; lanthanides
• ISSN: 1066-3622; 1608-3288
• DOI: 10.1134/S1066362223010083

The possibility of using 5-(diphenylphosphoryl)hexan-3-one as an extractant for efficient recovery of rare-earth metals (REM), as well as uranium(VI) and thorium(IV) from breakdown phosphogypsum solutions within a single technological extraction process was demonstrated. 5-(Diphenylphosphoryl)hexan-3-one as an extractant was compared in terms of efficiency with commercially available TBP and TOPO. It is shown that the complete recovery of rare earth metals into the organic phase is achieved in three stages of depletion. There occurs an extraction purification of total rare earth metals from uranium(VI) and thorium(IV). The separation factor during extraction for U(VI) and ΣREE was f [ΣREE/U(VI)] > 3000, and in the case of thorium(IV), f [ΣREE/Th(IV)] ~10000. 5-(Diphenylphosphoryl)hexan-3-one can be successfully used in the extraction processing of mineral and technogenic raw materials, which enables separation and concentration of REMs.