Electronic spectra and solubilities of alkali metal uranates formed upon oxidation of uranium dioxide in alkali metal carbonate and carbonate-based melts / Volkovich VA,Griffiths TR,Fray DJ,Fields M,Thied RC // . - 1998. - V. 98, l. 11. - P. 612-626.

ISSN/EISSN:

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Type:

Proceedings Paper

Abstract:

A detailed investigation of the dissolution of alkali metal uranates in carbonate melts was performed. Solubilities of three alkali metal (Li Na and K) mono- and diuranates were measured between 450 and 800 degrees C in a range of alkali carbonate mixtures, and the mechanism of basic and acidic dissolution determined. The influence of CO2 and O-2 partial pressures on their dissolution was also examined. The rate of UO2 oxidation in carbonate and carbonate-based melts is controlled by a formation of a solid layer of alkali metal uranates on the surface of urania. The oxidation of UO2 by oxygen in a variety of chloride melts was followed spectroscopically. In presence of aluminium ions uranyl chloride complexes are formed, but in pure alkali metal chlorides only alkali uranates are formed. A spectroscopic study of the dissolution of the uranates in chloride melts revealed that monouranates dissolve physically but diuranates undergo chemical dissolution forming ultimately monouranate species.

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DOI:

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Web of Science ID:

ISI:000077242400061

Соавторы в МНС:

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Другие поля

Поле	Значение
Editor	Trulove, PC and DeLong, HC and Stafford, GR and Deki, S
Booktitle	PROCEEDINGS OF THE ELEVENTH INTERNATIONAL SYMPOSIUM ON MOLTEN SALTS XI
Series	ELECTROCHEMICAL SOCIETY SERIES
Note	11th International Symposium on Molten Salts at the 193rd Meeting of the Electrochemical-Society, SAN DIEGO, CA, MAY 03-09, 1998
Organization	Electrochem Soc, Phys Electrochem Div; Electrochem Soc, High Temp Mat Div; Electrochem Soc, Electrodeposit Div; USAF, Off Sci Res
Publisher	ELECTROCHEMICAL SOCIETY INC
Address	65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA
Language	English
ISBN	1-56677-205-2
Research-Areas	Chemistry; Electrochemistry; Engineering; Materials Science
Web-of-Science-Categories	Chemistry, Multidisciplinary; Electrochemistry; Engineering, Chemical; Materials Science, Multidisciplinary
ResearcherID-Numbers	Volkovich, Vladimir/K-8339-2012
ORCID-Numbers	Volkovich, Vladimir/0000-0003-4438-1194
Doc-Delivery-Number	BL94E