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Matrices for immobilization of the rare earth–actinide waste fraction, synthesized by cold crucible induction melting

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Radiochemistry Aims and scope

Abstract

The structure of eight samples containing simulated rare earth–actinide fraction of high-level waste was studied. Samples of weight from 0.2 to 6 kg were prepared by cold crucible induction melting followed by crystallization of the melt. The target phases (britholite, pyrochlore, zirconolite, rhombic and monoclinic rare earth titanates) prevail in all the matrices; glass, zirconolite, and rutile were detected as impurities, sometimes in significant amounts. These phases do not contain waste components (rutile) or are stable in solutions (zirconolite); therefore, their presence should not impair the properties of the matrix. The possibility of controlling the phase composition of the matrix by introducing zirconium or aluminum oxide into the charge was demonstrated.

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Authors and Affiliations

  1. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetnyi per. 25, Moscow, 119017, Russia

    S. V. Yudintsev, B. S. Nikonov & M. S. Nikol’skii

  2. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, korp. 4, Moscow, 119071, Russia

    S. V. Stefanovsky

  3. Leading Research Institute of Chemical Technology, Kashirskoe shosse 33, Moscow, 115409, Russia

    M. Yu. Kalenova, A. M. Koshcheev & A. S. Shchepin

Authors
  1. S. V. Yudintsev
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  2. S. V. Stefanovsky
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  3. M. Yu. Kalenova
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  4. B. S. Nikonov
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  5. M. S. Nikol’skii
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  6. A. M. Koshcheev
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  7. A. S. Shchepin
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Correspondence to S. V. Yudintsev.

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Original Russian Text © S.V. Yudintsev, S.V. Stefanovsky, M.Yu. Kalenova, B.S. Nikonov, M.S. Nikol’skii, A.M. Koshcheev, A.S. Shchepin, 2015, published in Radiokhimiya, 2015, Vol. 57, No. 3, pp. 272–282.

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Yudintsev, S.V., Stefanovsky, S.V., Kalenova, M.Y. et al. Matrices for immobilization of the rare earth–actinide waste fraction, synthesized by cold crucible induction melting. Radiochemistry 57, 321–333 (2015). https://doi.org/10.1134/S1066362215030133

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  • DOI: https://doi.org/10.1134/S1066362215030133

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