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Microwave-assisted dissolution of ceramic uranium dioxide in TBP–HNO3 complex

Authors :
S. A. Perevalov
E. Toropchenova
Source :
Journal of Radioanalytical and Nuclear Chemistry. 298:1613-1618
Publication Year :
2013
Publisher :
Springer Science and Business Media LLC, 2013.

Abstract

Microwave-assisted dissolution of ceramic uranium dioxide in tri-n-butyl phosphate (TBP)–HNO3 complex was investigated. The research on dissolution of ceramic uranium dioxide in TBP–HNO3 inclusion complex under microwave heating showed the efficiency of the use of this method. Nitric acid present in the inclusion complex participates both dissolution of UO2, and oxidation of U(IV)–U(VI), the resulting UO2(NO3)2 extracted with tri-n-butyl phosphate. Dissolution rate depends on both temperature of microwave dissolution process, and concentration of nitric acid present in the inclusion complex. The most intensive dissolution process is when the concentration of nitric acid ≥2 mol/L and the temperature of 120 °C. From the experimental data obtained by two kinetic models activation energies were calculated. At the average activation energy of UO2 dissolution in TBP–HNO3 complex equal 70 kJ/mol, and reaction order is close to one, i.e. the reaction takes place in an area close to kinetic.

Details

ISSN :
15882780 and 02365731
Volume :
298
Database :
OpenAIRE
Journal :
Journal of Radioanalytical and Nuclear Chemistry
Accession number :
edsair.doi...........04af56948144c1ec4d28320805d73001
Full Text :
https://doi.org/10.1007/s10967-013-2552-5