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Basic Research on Batchwise Multi-stage Extractions Using TODGA for Dy/Nd Separation

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Abstract

The mutual separation of lanthanides has been studied by multi-stage extraction using an extractant, DGA (diglycolamide) compounds. N,N,N′,N′-tetraoctyl-DGA (TODGA) has a high extractability to lanthanides and a relatively high separation factor (SF) between Dy and Nd (SF of over 20) from HN3 media. Complete separation with such SF values can be achieved by multi-stage extraction. Less information on multi-stage extraction compared to batch extraction has been presented up to now. We thus conducted a basic study. By confirming the experimental data to be identical to calculations, the sample solution including both metals was employed for batchwise multi-stage extraction. Ninety-seven percent of Dy with under detection limit of Nd could be recovered into the organic phase from Nd with a ten-times higher concentration than Dy using the condition, 0.1 M TODGA/n-dodecane and 0.3 M HN3 by the multi extraction of 9 × 9 stages for organic and aqueous phases.

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Authors and Affiliations

  1. Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan

    Yuji Sasaki & Masahiko Matsumiya

  2. Yokohama National University, 79-1 Tokiwadai, Yokohama, 240-8501, Japan

    Yusuke Tsuchida

Authors
  1. Yuji Sasaki
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  2. Masahiko Matsumiya
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  3. Yusuke Tsuchida
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Correspondence to Yuji Sasaki.

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Sasaki, Y., Matsumiya, M. & Tsuchida, Y. Basic Research on Batchwise Multi-stage Extractions Using TODGA for Dy/Nd Separation. ANAL. SCI. 36, 1303–1311 (2020). https://doi.org/10.2116/analsci.20P129

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  • DOI: https://doi.org/10.2116/analsci.20P129

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