Extraction of U(VI), Th(IV), and Lanthanides(III) from Nitric Acid Solutions with Mixtures of Diphenyl-N,N-dioctylcarbamoylmethylphosphine Oxide and Lithium Bis[(trifluoromethyl)sulfonyl]imide

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Abstract

The extraction of U(VI), Th(IV), and lanthanide(III) ions with mixtures of diphenyl-N,N-dioctylcarbamoylmethylphosphine oxide (Ph2Oct2) and lithium bis[(trifluoromethyl)sulfonyl]imide (LiTf2N) in dodecane containing 10% octanol was studied. A synergistic effect was discovered during the extraction of metal ions with such mixtures. When extracting Ln(III) from solutions of 3 mol/l HNO3, the DLn values in the system with Ph2Oct2–LiTf2N are more than three orders of magnitude higher than when extracting with a solution of Ph2Oct2. The stoichiometry of the extracted complexes was determined, and the effect of HNO3 concentration on the extraction of metal ions was studied. It has been established that actinide and lanthanide(III) ions are extracted with a mixture of Ph2Oct2 and LiTf2N from nitric acid solutions via a cation-exchange mechanism.

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A. N. Turanov

Osipyan Institute of Solid State Physics, Russian Academy of Sciences

Author for correspondence.
Email: karan@iptm.ru
Russian Federation, ul. Akademika Osipyana 2, Chernogolovka, Moscow oblast, 142432

V. K. Karandashev

Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences

Email: karan@iptm.ru
Russian Federation, ul. Akademika Osipyana 6, Chernogolovka, Moscow oblast, 142432

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Supplementary files

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2. Fig. 1 Extraction of Th(IV), U(VI) and Eu(III) from 3 mol/L HNO3 solutions by isomolar mixtures of CMFOs Ph2Oct2 and LiTf2N in dodecane containing 10% octanol. [Ph2Oct2] + + [LiTf2N] = 0.02 mol/L for Th(IV) and U(VI) extraction and 0.05 mol/L for Eu(III) extraction.s

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3. Fig. 2 Distribution coefficients of Ln(III) during extraction from 3 mol/L HNO3 solution with 0.05 mol/L KMFO Ph2Oct2 solutions in dodecane containing 10% octanol (2) and in dodecane containing 10% octanol in the presence of 0.05 mol/L LiTf2N (1).

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4. Fig. 3 Dependence of the distribution coefficients of Th(IV) (1), U(VI) (2), Pr(III) (3), Eu(III) (4), Ho(III) (5) and Lu(III) (6) on the concentration of Ph2Oct2 in dodecane containing 10% octanol and 0.025 mol/L LiTf2N, during extraction from 3 mol/L HNO3 solution.

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5. Fig. 4 Dependence of the distribution coefficients of Th(IV) (1), U(VI) (2), Eu(III) (3), Ho(III) (4), Tm(III) (5) and Lu(III) (6) on the concentration of LiTf2N in dodecane containing 10% octanol and 0.01 (1), 0.02 (2) and 0.05 (3-6) mol/L Ph2Oct2, when extracted from 3 mol/L HNO3 solution.

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6. Fig. 5 Dependence of Ln(III) distribution coefficients on HNO3 concentration in the aqueous phase during extraction with solutions of a mixture of 0.025 mol/L KMFO Ph2Oct2 and 0.025 mol/L LiTf2N in dodecane containing 10% octanol.

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7. Fig. 6 Distribution coefficients of Ln(III) during extraction from 3 mol/L HNO3 (2) and 3 mol/L HCl (1) solution with solutions of a mixture of 0.025 mol/L KMFO Ph2Oct2 and 0.025 mol/L LiTf2N in dodecane containing 10% octanol.

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