Coordination state of vanadium in chloride melts: An electronic absorption spectroscopy study / Vasin B.D., Polovov I.B., Volkovich V.A., Griffiths T.R., Berezin A.V. // Proceedings - Electrochemical Society. - 2006. - V. PV 2004-24, l. . - P. 261-268.

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Conference Paper

Abstract:

The coordination of the chloro complexes of vanadium in its lower oxidation states was studied spectroscopically in molten equimolar mixture of NaCl-KCl at 750°C V(III) is the most stable oxidation state that does not form oxygen-containing complexes. Addition of excess vanadium or a suitable reducing metal (silver) to V(III)-containing melts converts V(III) to V(II) and some V(II) chloro complex ions can then react with silica to form an oxygen-containing insoluble phase. Reaction of V(II)-containing melts with oxygen leads to precipitation of a vanadium oxo-species. When NaCl-KCl-VCl 3 melts are exposed to an oxygen containing atmosphere the vanadium content remains constant but VCl6 3- is converted into VOCl4 2-. The reaction products of V metal with Cl 2 in NaCl-KCl melt depend on the concentration of chlorine. V(II) and V(III) species are initially formed at low flow rates and V(IV) at high. Most of V(IV) in this case sublimes, or is swept from the melt with the chlorine, as volatile VCl4.

Author keywords:

Index keywords:

Absorption spectroscopy; Chloride minerals; Concentration (process); Melting; Oxidation; Volatile organic compounds; Chloro complex ions; Molten equimolar mixture; Oxygen-containing complexes; Vanadiu

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Поле	Значение
Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-40249083237&partnerID=40&md5=aac932afb4350791cf9551a6c9079206
Affiliations	Department of Rare Metals, Ural State Technical University-UPI, Ekaterinburg, 620002, Russian Federation; School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom
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Correspondence Address	Vasin, B.D.; Department of Rare Metals, Ural State Technical University-UPI, Ekaterinburg, 620002, Russian Federation
Sponsors	Electrochemical Society Inc, Physical Electrochemistry Division;Electrochemical Society Inc, High Temperature Materials Division;Electrochemical Society Inc, Electrodeposition Division
Conference name	206th ECS Meeting
Conference date	3 October 2004 through 8 October 2004
Conference location	Honolulu, HI
Conference code	71459
ISBN	9781566775144
Language of Original Document	English
Abbreviated Source Title	Proc. Electrochem. Soc.
Source	Scopus