Oxidation of powder and ceramic UO2 by KClO3 in molten (Li-Na-K)2CO3 eutectic / Volkovich V.A., Griffiths T.R., Fray D.J., Fields M., Thied R.C. // Journal of the Chemical Society - Faraday Transactions. - 1998. - V. 94, l. 17. - P. 2623-2625.

ISSN:

09565000

Type:

Article

Abstract:

The oxidation of UO2 powder and ceramic has been studied in the (Li-Na-K)2CO3 eutectic melt containing added potassium chlorate between 723 and 873 K. Complete oxidation of the powder could be achieved at 723 K and with KClO3 : UO2 mole ratios between 0.25 and 0.3. Potassium monouranate was formed in the reaction and no chlorine was liberated. Although 723 K is some 50 K above the starting temperature for decomposition of KClO3 in air, tests showed that in the ternary carbonate eutectic less than 10% had decomposed in the first 30 min. Comparison with the oxidation of UO2 by KNO3, the previous best known oxidant under similar conditions, showed that the efficiency of KClO3 as an oxidising agent for UO2 powder was greater at 723 K. KClO3 was also better than KNO3 for the oxidation of ceramic UO2 at 723 K, but the reaction was not complete at this temperature, even at KClO3 : UO2 mole ratios up to 3.8. Attempts to achieve complete reaction by increasing the temperature were unsuccessful because the KClO3 now decomposed too rapidly.

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-33748666409&partnerID=40&md5=5e6ab1f2922633e493215db0c19486c7
Affiliations	School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom; Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QZ, United Kingdom; British Nuclear Fuels plc. (BNFL), R and T North, Sellafield, Seascale, Cumbria, CA20 1PG, United Kingdom; Department of Rare Metals, Physical-Engineering Faculty, Ural State Technical University-UPI, 19 Mira Ul, 620002, Ekaterinburg, Russian Federation; Protea Limited, Magpie Manor, Wistaston Green Road, Crewe, CW2 8SA, United Kingdom
References	Kryukova, A.I., Pechenevskaya, O.V., Skiba, O.V., (1990) Radiokhimiya, 32, p. 105; Volkovich, V.A., Griffiths, T.R., Fray, D.J., Fields, M., Wilson, P.D., (1996) J. Chem. Soc., Faraday Trans., 92, p. 5059; Volkovich, V.A., Griffiths, T.R., Fray, D.J., Fields, M., (1997) J. Chem. Soc., Faraday Trans., 93, p. 3819; Volkovich, V.A., Griffiths, T.R., Fray, D.J., Fields, M., (1998) J. Nucl. Mater., 256, p. 131; Fowler, G.J., Grant, J., (1890) J. Chem. Soc., 57, p. 272; Hodgkinson, W.R., Lowndes, F.K., (1888) Chem. News J. Phys. Sci., 59, p. 309; Brunck, O., (1895) Z. Anorg. Chem., 10, p. 222; Ditte, A., (1882) Compt. Rend., 95, p. 988; (1936) Gmelins Handbuch der Anorganischen Chemie, 55, p. 188. , Verlag Chemie, Berlin; Ditte, A., (1884) Ann. Chim. Phys., 1, p. 338. , ser. IV; Drenckmann, B., (1861) Z. Gesamte Naturwiss., 17, p. 131; (1936) Gmelins Handbuch der Anorganischen Chemie, 55, p. 102. , Verlag Chemie, Berlin; Carnall, W.T., Neufeldt, S.J., Walkers, A., (1965) Inorg. Chem., 4, p. 1808; Armstrong, G.W., Gill, H.H., Rolf, R.F., (1961) Treatise on Analytical Chemistry, 7 (2 PART), p. 408. , ed. I. M. Kolthoff and P. J. Elving, Interscience Publishers, New York-London; Schlegel, J., (1965) J. Phys. Chem., 69, p. 3638; Schlegel, J., (1967) J. Phys. Chem., 71, p. 1520
Correspondence Address	Griffiths, T.R.; School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom
Language of Original Document	English
Source	Scopus