An Effect of Water on the Uranium Supercritical CO2 Extraction Effectiveness from Natural Minerals

  • Boris Borts National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine
  • Yuri Kazarinov V.N. Karazin Kharkiv National University, Kharkiv, Ukraine; National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine https://orcid.org/0000-0001-5143-8545
  • S. Sirenko National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine
  • Stella Skoromnaya National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine
  • Victor Tkachenko V.N. Karazin Kharkiv National University, Kharkiv, Ukraine; National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine https://orcid.org/0000-0002-1108-5842
Keywords: supercritical carbon dioxide, supercritical extraction, uranium, tributyl phosphate, two-level system

Abstract

Experimental data on investigation of water effect on efficiency of supercritical fluid extraction by carbon dioxide (SFE-CO2) of uranium complexes from nature minerals at carbon dioxide pressure to 20.0 MPa and temperature to 45oC are presented. It is shown that dependence of extraction efficiency on water quantity has the peak pattern, that is, under specific pressure and temperature the efficiency of extraction is maximal. Conditions under which the maximal efficiency of SFE-CO2 complexes of uranium is attained are determined. Two level model for description of SFE-CO2 extraction of water is proposed.  The proposed model corresponds well with experimental data. Double two level model for description of SFE-CO2 extraction of uranium complex in the presence of water is proposed. The experimentally observed decrease of uranium complex extraction efficiency with the increase of free water quantity is described analytically by the use of double model. It is confirmed in the frame of double model that the maximum efficiency of extraction is attained for water quantity completely bounded by uranium complex and corresponding to its limit of solubility in supercritical CO2. The proposed models allowed evaluate the values of probability of induced transitions in two-level systems.

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Published
2012-05-29
Cited
How to Cite
Borts, B., Kazarinov, Y., Sirenko, S., Skoromnaya, S., & Tkachenko, V. (2012). An Effect of Water on the Uranium Supercritical CO2 Extraction Effectiveness from Natural Minerals. East European Journal of Physics, (1001(2), 125-134. Retrieved from https://periodicals.karazin.ua/eejp/article/view/13832
Issue
No. 1001(2) (2012): The Journal of Kharkiv National University, Physical series "Nucleus, Particles, Fields", ISSN 2221-7754
Section
Original Papers

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