Speciation of molybdenum and tungsten in molten chlorides: A spectroelectrochemical study / Volkovich V.A., Danilov D.A., Polovov I.B., Vasin B.D., Griffiths T.R., Aleksandrov D.E., Tropin O.A., Tsarevskii D.V. // ECS Transactions. - 2007. - V. 3, l. 35. - P. 555-566.

ISSN:

19385862

Type:

Conference Paper

Abstract:

Speciation of tungsten and molybdenum in alkali chloride melts (based on NaCl-2CsCl, NaCl-KCl and 3LiC1-2KC1 mixtures) was studied between 450 and 750°C using electronic absorption spectroscopy. Only W(IV) and W(V) chloro- and oxychloro-species can be stabilised under conditions studied. Tungsten(IV) chloride ions are very sensitive to oxide/hydroxide impurities present in the melt. Anodic dissolution of W metal at anodic current densities in the range of 0.005-0.1 A/cm2 produces only WCl62- ions that can be electrochemically oxidised to WCl6-. Small amounts of oxide ions present in the melt result in a gradual conversion of W(IV) chloro-species into W(IV) oxychloro-species. In the presence of O2 WCl62- is oxidised into tungsten(V) species WOCl 52-. Molybdenum forms Mo(III), (IV) and (V) species. MoCl62- complex ions in chloride melts can be obtained by reacting MoO2 with HCl, or by electrochemical oxidation of Mo(III) (MoCl63- → MoCl62-) on a glassy carbon electrode. copyright The Electrochemical Society.

Author keywords:

Index keywords:

(I ,J) conditions; Alkali chloride melts; Anodic current densities; Anodic dissolution; Chloride ions; Electronic absorption spectroscopies; International symposium; Molten chlorides; Molten salts; Mo

DOI:

10.1149/1.2798697

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-45249091722&doi=10.1149%2f1.2798697&partnerID=40&md5=c5c60055ed8bd79119b5416e688d5863

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-45249091722&doi=10.1149%2f1.2798697&partnerID=40&md5=c5c60055ed8bd79119b5416e688d5863
Affiliations	Department of Rare Metals, Ural State Technical University-UPI, Ekaterinburg 620002, Russian Federation; Redston Trevor Consulting, Ltd., Leeds LS17 8RF, United Kingdom
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Correspondence Address	Volkovich, V. A.; Department of Rare Metals, Ural State Technical University-UPI, Ekaterinburg 620002, Russian Federation
Sponsors	Electrochemical Society, Phys. Anal. Electrochem. Div.;Electrochemical Society, Electrodeposition Division;Electrochemical Society, High Temperature Materials Division;Electrochemical Society, Battery Division;Electrochemical Society, Energy Technology Division
Conference name	15th International Symposium on Molten Salts - 210th ECS Meeting
Conference date	29 October 2006 through 3 November 2006
Conference location	Cancun
Conference code	72280
ISBN	9781566775922
Language of Original Document	English
Abbreviated Source Title	ECS Transactions
Source	Scopus