Russian Journal of Physical Chemistry B

, Volume 10, Issue 7, pp 1078–1084

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

  • M. D. Samsonov
  • T. I. Trofimov
  • Yu. M. Kulyako
  • D. A. Malikov
  • B. F. Myasoedov
Article

Abstract

Supercritical fluid extraction (SCFE) using carbon dioxide containing tributyl phosphate (TBP), di-(2-ethylhexyl)phosphoric acid (D2EHPA) and their adducts with HNO3 is applied for extraction of rare earth elements (REE), thorium (Th) and uranium (U) from monazite concentrate (MC) and phosphogypsum (PG). REE extraction from MC and their separation from Th and U are carried out from the product of MC–Na2CO3 baking (MCS), which is obtained under microwave irradiation, after which the phosphates of REE, Th and U present in the MC are converted into their oxides. Up to 50% of REE can be recovered as the adducts of TBP and D2EHPA with HNO3 from the resulting powdered MCS under SCFE conditions, whereas Th and U remain in the solid phase. After a complete dissolution of the MCS residue in the mixture of 4 M HCl and 0.05 M HF, Th and U are quantitatively extracted using supercritical carbon dioxide (SC CO2) containing D2EHPA and thus separated from the REE that remain in an acidic solution. The conditions of quantitative isolation of REE, Th and U from PG are determined. The schemes for complex processing of MC and PG aimed at REE recovery and their separation from Th and U are suggested.

Keywords

supercritical fluid extraction microwave radiation rare earth elements thorium uranium carbon dioxide monazite concentrate phosphogypsum tributyl phosphate di-(2-ethylhexyl)phosphoric acid 

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Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • M. D. Samsonov
    • 1
  • T. I. Trofimov
    • 1
  • Yu. M. Kulyako
    • 1
  • D. A. Malikov
    • 1
  • B. F. Myasoedov
    • 1
  1. 1.Vernadsky Institute of Geochemistry and Analytical ChemistryRussian Academy of ScienceMoscowRussia

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