Thermodynamic Analysis of the Oxidation of Radioactive Graphite in a Multicomponent Melt in an Inert Atmosphere
- Authors: Barbin N.M.1,2,3, Kobelev A.M.2, Terent’ev D.I.2, Alekseev S.G.2,4
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Affiliations:
- Ural State Agrarian University
- Ural Institute of GPS MChS
- Ural Federal University
- Scientific–Engineering Center Reliability and Resource of Large Systems and Machines, Ural Branch, Russian Academy of Sciences
- Issue: Vol 2018, No 8 (2018)
- Pages: 700-706
- Section: Article
- URL: https://journals.rcsi.science/0036-0295/article/view/172024
- DOI: https://doi.org/10.1134/S0036029518080025
- ID: 172024
Cite item
Abstract
Graphite occupies a specific place among the entire mass of accumulated radioactive wastes. The problem of reclamation of spent graphite has not yet been solved in the world. The behavior of radioactive graphite in the multicomponent CuO–NaCl–KCl–Na2CO3–K2CO3 melt in an argon atmosphere in the temperature range 373–3273 K is studied by thermodynamic simulation with the Terra software package, which is intended for calculating the phase compositions and the thermodynamic and transport properties of arbitrary systems. The calculation was performed using a database on the properties of individual substances. At 1273 K, graphite burns to form carbon monoxide and carbon dioxide. The condensed compounds of cesium, chlorine, and uranium evaporate at 1573 K. An increase in the system temperature to 1873 K leads to the vapor pressure of condensed nickel. Condensed strontium oxide transforms into a vaporized state at 2273 K. The condensed compounds of plutonium, calcium, and europium transforms into a vaporized state at 2373 K. Condensed beryllium oxide evaporates at 2473 K. A further increase in the temperature to 2673 K leads to the evaporation of condensed americium(III) oxide. Only a vapor–gas phase is present in the isolated system in the temperature range 2673–3273 K.
About the authors
N. M. Barbin
Ural State Agrarian University; Ural Institute of GPS MChS; Ural Federal University
Author for correspondence.
Email: NMBarbin@mail.ru
Russian Federation, Yekaterinburg, 620075; Yekaterinburg, 620062; Yekaterinburg, 620002
A. M. Kobelev
Ural Institute of GPS MChS
Email: NMBarbin@mail.ru
Russian Federation, Yekaterinburg, 620062
D. I. Terent’ev
Ural Institute of GPS MChS
Email: NMBarbin@mail.ru
Russian Federation, Yekaterinburg, 620062
S. G. Alekseev
Ural Institute of GPS MChS; Scientific–Engineering Center Reliability and Resource of Large Systems and Machines, Ural Branch,Russian Academy of Sciences
Email: NMBarbin@mail.ru
Russian Federation, Yekaterinburg, 620062; Yekaterinburg, 620049