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Gas-Phase Conversion of Oxide Phases of Lanthanides and Uranium to Water-Soluble Compounds

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Abstract

Gas-phase conversion to water-soluble compounds of individual rare-earth element (REE) (La, Ce, Pr, Nd, Sm, Eu, Dy, Ho, Er, Tm, Lu) oxides and oxide systems (U,Ce)Ox and (U,Nd)Ox in the atmospheres HNO3 (vapor)–air and NOx–H2O (vapor)–air was examined. It was shown that water-soluble compounds are formed in the gas-phase conversion of REE oxides in the atmosphere of both HNO3 vapor and NOx gases. In the case of (U,Ce)Ox in the atmosphere of HNO3 (vapor)–air, water-soluble compounds of uranium are formed, with a part of cerium remaining in the phase of the water-insoluble precipitate. The conversion of (U,Nd)Ox under the same conditions yields water-soluble compounds of both uranium and neodymium. It was found that these gas media can be used in principle to extract uranium from fuel systems containing rare-earth elements.

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Funding

The study was financially supported by the Russian Foundation for Basic Research under the research project no. 18-33-01208.

Part of measurements were made with the use of equipment from the Research Center of Collective Use at the chemical faculty of Lomonosov Moscow State University.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Moscow, Russia

    Yu. M. Nevolin, S. A. Kulyukhin, A. V. Gordeev, A. A. Bessonov & S. N. Kalmykov

  2. Lomonosov Moscow State University, 119991, Moscow, Russia

    Yu. M. Nevolin

Authors
  1. Yu. M. Nevolin
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  2. S. A. Kulyukhin
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  3. A. V. Gordeev
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  4. A. A. Bessonov
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  5. S. N. Kalmykov
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Correspondence to S. A. Kulyukhin.

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Nevolin, Y.M., Kulyukhin, S.A., Gordeev, A.V. et al. Gas-Phase Conversion of Oxide Phases of Lanthanides and Uranium to Water-Soluble Compounds. Radiochemistry 62, 317–330 (2020). https://doi.org/10.1134/S1066362220030042

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