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Barbin, N. M., Kobelev, A. M., Terent’ev, D. I., & Alekseev, S. G. (2020). Thermodynamic Analysis of Radioactive Graphite Oxidation in NiO-NaCl-KCl-Na2CO3-K2CO3 Melt in the Atmosphere of Argon. KnE Materials Science, 6(1), 486–491. https://doi.org/10.18502/kms.v6i1.8129

https://doi.org/10.18502/kms.v6i1.8129

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authors

  • Nikolaj Mihajlovich Barbin

    Nikolaj Mihajlovich Barbin

    Ural State Agrarian University, Ekaterinburg, Russia
  • Anton Mihajlovich Kobelev

    Anton Mihajlovich Kobelev

    2Ural State Fire Service Institute of Emercom of Russia, Ekaterinburg, Russia
  • Dmitrij Ivanovich Terent'ev

    Dmitrij Ivanovich Terent'ev

    Ural State Fire Service Institute of Emercom of Russia, Ekaterinburg, Russia
  • Sergej Gennad'evich Alekseev

    Sergej Gennad'evich Alekseev

    Ural Federal University named after the first President of Russia B.N. Yeltsin, Ekaterinburg, Russia

Published Date

  • Dec 31, 2020

Thermodynamic Analysis of Radioactive Graphite Oxidation in NiO-NaCl-KCl-Na2CO3-K2CO3 Melt in the Atmosphere of Argon

KnE Materials Science / IV Congress “Fundamental Research and Applied Developing of Recycling and Utilization Processes of Technogenic Formations” Volume 2020 / Pages 486–491

Abstract




Behavior of U, Pu radionuclides was investigated when heating radioactive graphite in NaCl – KCl – Na2CO3 – K2CO3 melt with NiO additives using the thermodynamic modeling method. Calculations were made by the TERRA software that is used for the determination of phase composition, thermodynamic and transport properties, taking into account chemical and phase changes in temperature range 373 – 3273 K. Calculation of equilibrium phase composition and parameters of equilibrium was carried out using reference information about properties of the individual substances (INVATERMO, HSC, etc.). This study demonstrates that at a temperature of 1273 K the condensed carbon burns down with the formation of CO and CO2. Increasing temperature to 1673 K causes the condensed compounds of uranium to evaporate. This study determined that uranium exists in the form of ionized UO−3 in temperature range from 1673 to 3273 K. Plutonium exists in the form of gaseous PuO2, PuO in temperature range 2373 – 3273 K.


Keywords: thermodynamic modeling, radionuclides, radioactive graphite




References
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