A spectroscopic study of uranium species formed in chloride melts / Volkovich V.A., Bhatt A.I., May I., Griffiths T.R., Thied R.C. // Journal of Nuclear Science and Technology. - 2002. - V. 39, l. . - P. 595-598.

ISSN:
00223131
Type:
Article
Abstract:
The chlorination of uranium metal or uranium oxides in chloride melts offers an acceptable process for the head-end of pyrochemical reprocessing of spent nuclear fuels. The reactions of uranium metal and ceramic uranium dioxide with chlorine and with hydrogen chloride were studied in the alkali metal chloride melts, NaCl-KCl at 973 K, NaCl-CsCl between 873 and 923 K, and LiCl-KCl at 873 K. The uranium species formed therein were characterised from their electronic absorption spectra measured in situ. The kinetic parameters of the reactions depend on melt composition, temperature and chlorinating agent used. The reaction of uranium dioxide with oxygen in the presence of alkali metal chlorides results in the formation of alkali metal uranates. A spectroscopic study, between 723 and 973 K, on their formation and their solutions was undertaken in LiCl, LiCl-KCl eutectic and NaCl-CsCl eutectic melts. The dissolution of uranium dioxide in LiCl-KCl eutectic at 923 K containing added aluminium trichloride in the presence of oxygen has also been investigated. In this case, the reaction leads to the formation of uranyl chloride species. © 2002 Atomic Energy Society of Japan.
Author keywords:
Alkali metal chloride melts; Alkali metal uranates; Chlorination; Dissolution; Electronic absorption spectroscopy; Solubility; Uranium; Uranium dioxide
Index keywords:
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DOI:
10.1080/00223131.2002.10875538
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Link https://www.scopus.com/inward/record.uri?eid=2-s2.0-85010576768&doi=10.1080%2f00223131.2002.10875538&partnerID=40&md5=cf9649e12ca19cdde726ccb6d7a2fff6
Affiliations Centre for Radiochemistry Research, Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom; School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom; British Nuclear Fuels plc (BNFL), Sellafield R and D, Sellafield, Cumbria, CA20 1PG, United Kingdom
Author Keywords Alkali metal chloride melts; Alkali metal uranates; Chlorination; Dissolution; Electronic absorption spectroscopy; Solubility; Uranium; Uranium dioxide
References Kleykamp, H., The chemical state of the fission products in oxide fuels (1985) J. Nucl. Mater., 131, p. 221; Imoto, S., Chemical state of fission products in irradiated UO2 (1986) J. Nucl. Mater., 140, p. 19; Gruen, D.M., (1964), p. 331. , Fused Salts, McGraw-Hill Book Company, New York, and references cited therein; Smith, G.P., (1964), p. 481. , Molten Salt Chemistry, Interscience Publishers, New York, and references cited therein; Griffiths, T.R., Volkovich, V.A., A review of the high temperature oxidation of uranium oxides in molten salts and in the solid state to form alkali metal uranates, and their composition and properties (1999) J. Nucl. Mater., 229, p. 274; Johnson, T.R., Compact pyrochemical process, Power Reactor Technol (1966) Reactor Fuel Proc., 10, p. 79; Kobayashi, F., Ogawa, T., Okamoto, Y., Akabori, M., Actinide nitrides and nitride-halides in high-temperature systems (1998) J. Alloys Compounds, 374, pp. 271-273; Blander, M., Nagy, Z., Coulomb complexing and the solubilization of oxides in halide melts (1983) Z. Naturforsch., Teil A, 38, p. 116; Dai, S., Toth, L.M., Del Cul, G.D., Metcalf, D.H., Solubility of uranium(IV) dioxide in magnesium chloride, calcium chloride, and aluminium chloride melts: A comparative study (1996) J. Phys. Chem., 100, p. 220; Gruen, D.M., McBeth, R.L., Oxidation states and complex ions of uranium in fused chlorides and nitrates (1959) J. Inorg. Nucl. Chem., 9, p. 290
Correspondence Address Volkovich, V.A.; Centre for Radiochemistry Research, Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom; email: vladimir.a.volkovich@man.ac.uk
Language of Original Document English
Abbreviated Source Title J. Nucl. Sci. Technol.
Source Scopus