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Kinetics of REE separation by nonequilibrium extraction at oscillating temperature

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Abstract

The effect of periodic oscillations of temperature on the extraction and backwashing in the extraction systems 6 M NaNO3-Nd(NO3)3-Pr(NO3)3-TBP-kerosene and [Nd(NO3)3 · 3TBP]-[Pr(NO3)3 · 3TBP]-kerosene-0.1 M HNO3 was studied. Application of periodic temperature oscillations to the extraction system NaNO3-Nd(NO3)3-Pr(NO3)3-TBP-kerosene-0.1 M HNO3 increased the REE separation factor in a unit consiting of a continuous liquid membrane between two extractors. A mathematical model of nonstationary membrane extraction supplemented by the block of the temperature dependences of the extraction rate constants was developed. The activation energies of the forward and reverse reactions of the extraction and backwashing of Pr and Nd were calculated. For the extraction process of REE separation with a liquid membrane under the effect of periodic temperature oscillations, the following parameters were optimized: frequency and amplitude of temperature oscillations, distribution of the total volume of the organic phase between the extractors, and flow rate of the liquid membrane.

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Authors and Affiliations

  1. St. Petersburg State Institute of Technology (Technical University), St. Petersburg, Russia

    A. A. Kopyrin, A. A. Fomichev & M. A. Afonin

Authors
  1. A. A. Kopyrin
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  2. A. A. Fomichev
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  3. M. A. Afonin
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Additional information

Original Russian Text A.A. Kopyrin, A.A. Fomichev, M.A. Afonin, 2007, published in Radiokhimiya, 2007, Vol. 49, No. 3, pp. 244–247.

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Kopyrin, A.A., Fomichev, A.A. & Afonin, M.A. Kinetics of REE separation by nonequilibrium extraction at oscillating temperature. Radiochemistry 49, 277–280 (2007). https://doi.org/10.1134/S1066362207030125

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  • DOI: https://doi.org/10.1134/S1066362207030125

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