NDLI: Recovery of rare earth elements, uranium, and thorium from monazite concentrate by supercritical fluid extraction

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Recovery of rare earth elements, uranium, and thorium from monazite concentrate by supercritical fluid extraction

Content Provider	Springer Nature Link
Author	Samsov, M. D. Trofimov, T. I. Kulyako, Yu. M. Vikurov, S. E. Malikov, D. A. Batorshin, G. Sh. Myasoedov, B. F.
Copyright Year	2015
Abstract	Quantitative recovery of rare earth elements (REEs), Th, and U by supercritical fluid extraction (SCFE) with carbon dioxide containing adducts of TBP and HDEHP with HNO$_{3}$ directly from monazite concentrate (MC) powder is impossible and requires the conversion of the constituent elements into more soluble compounds. Microwave (MW) radiation can be efficiently used for MC pretreatment by sintering with Na$_{2}$CO$_{3}$ in the presence of coal. The resulting product consists of two phases. One of them contains REEs (∼50%) recoverable by supercritical carbon dioxide (SC-CO$_{2}$) containing adducts of TBP or HDEHP with HNO$_{3}$. The second phase is a solid solution of CeO$_{2}$ with Th and U oxides and remaining amount of REEs. It is resistant to SCFE. Conditions were determined for quantitative dissolution of this phase in a mixture of 4 M HCl with 0.05 M HF. The use of HDEHP under the SCFE conditions allows quantitative recovery of Th and U from the hydrochloric acid solution. In the process, REEs remain in the aqueous phase and are thus separated from Th and U. A possible flowsheet was suggested for the recovery REEs from MC using SCFE with their simultaneous separation from Th and U.
Starting Page	343
Ending Page	347
Page Count	5
File Format	PDF
ISSN	10663622
Journal	Radiochemistry
Volume Number	57
Issue Number	4
e-ISSN	16083288
Language	English
Publisher	Pleiades Publishing
Publisher Date	2015-08-02
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	rare earth elements uranium thorium monazite concentrate supercritical fluid extraction carbon dioxide microwave radiation Nuclear Chemistry Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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Supercritical fluid extraction of rare earth elements, thorium and uranium from monazite concentrate and phosphogypsum using carbon dioxide containing tributyl phosphate and di-(2-ethylhexyl)phosphoric acid

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Recovery of rare earth elements, uranium, and thorium from monazite concentrate by supercritical fluid extraction

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