2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 7: Ionic Liquids & Energy Production

Editors:Kongoli F, Gaune-Escard M, Mauntz M, Rubinstein J, Dodds H.L.
Publisher:Flogen Star OUTREACH
Publication Year:2015
Pages:310 pages
ISBN:978-1-987820-30-0
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Electrical Conductivity of Cryolite - Based System With Low Melting Temperature

    Piotr Palimaka1; Stanislaw Pietrzyk1;
    1AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, Krakow, Poland;
    Type of Paper: Regular
    Id Paper: 93
    Topic: 13

    Abstract:

    In order to reduce the high temperature aluminum electrolysis process it is proposed to apply so-called low-melting electrolytes. It is considered that KF-AlF3-based solutions are promising electrolytes in this process. In this work, the electrical conductivity of low-melting electrolytes (nKF/nAlF3=1.3-1.7) with Al2O3 (4 mas.%), NaF (2-6 mas.%) and LiF (2-6 mas.%) additives was investigated using BN tube type cell. The melts were measured by continuously varying cell constant (CVCC) method. AC - techniques with a sine wave signal with 10mV amplitude in the high frequency range (5-100 kHz) were applied. Electrical conductivity of aqueous solution of KCl, molten KCl and Na3AlF6 was measured to check the measuring method. The results prove that the method is reliable and accurate. The conductivity of investigated electrolytes was found to vary linearly with temperature. The activation energy of conductance was calculated based on Arrhenius equation. The electrical conductivity is decreased with Al2O3 and increased with NaF and LiF additions.

    Keywords:

    Conductivity; Electrolysis; Moltensalt;

    References:

    [1] I. Galasiu, R. Galasiu, Aluminium Electrolysis with Inert Anodes and Wettable Cathodes and with Low Energy Consumption, Molten Salts Chemistry and Technology, First Edition, 2014, John Wiley & Son
    [2] O. Tkacheva, J. Spangenberger, B. Davis, J. Hryn, Aluminium Electrolysis in an Inert Anode Cell, Molten Salts Chemistry and Technology, First Edition, 2014, John Wiley & Son
    [3] I. Galasiu, R. Galasiu, J. Thonstad, Inert Anodes for Aluminium Electrolysis, Aluminium Verlag, Dusseldorf , 2007
    [4] J. Thonstad, P. Fellner, G.M. Haarberg, J. Hives, H. Krande, A. Sterten, Aluminium electrolysis. Fundamentals of the Hell-Heroult process, 3rd Edition, Aluminium Verlag, Dusseldorf, 2001
    [5] Y. Yaping, Z. Yunyou, L. Fushen, L. Lifen, Z. Gouzhi, Measurement of Conductivity and Electronic Conduction of Cryolite Alumina Melts, TMS, 2004
    [6] R. David, ED., CRC Handbook of Chemistry and Physics, internet version http://www.hbcpnetbase.com, CRC Press, Boca Raton, Fl, 2005
    [7] G.J. Janz at al., Molten Salts: Volume 1. Electrical Conductance, Density and Viscosity Data, NSRDS-NBS 15, 1968
    [8] J. Hives, J. Thonstad, A. Sterten, P. Fellner, Light Metals 1994
    [9] A.P. Apisarov, V.A. Kryukovskii, Yu.P. Zaikow, A.A. Redíkin, O.Yu. Tkacheva, V.A. Khokhlov: Conductivity of Low-Temperature KF-AlF3 Electrolytes Containing Lithium Fluoride and Alumina, Russian Journal of Electrochmistry Vol. 43 No.7 (2007) 870-874
    [10] J. Thonstad, J. Hives, Electrical Conductivity Measurement in Molten Fluorides, 7th International Symposium on Molten Salt Chemistry and Technology, Toulouse 2005
    [11] A. Dedyukhin, A. Apisarov, P.Tinghaev, A. Redíkin, Yu. Zaikov, Electrical Conductivity of the KF-NaF-AlF3 Molten System at low Cryolite Ratio With CaF2 Additions, Light Metals 2011
    [12] Y. Hengwei, Y. Jianhong, L. Wangxing, Ch. Shazi, Alumina Solubility in KF-NaF-AlF3-Based Low-Temperature Electrolyte, Metallurgical and Materials Transaction B, 42B (2011)
    [13] J. Yang, J. Hryn, G. Krumdick, Aluminium electrolysis test with inert anodes in KF-AlF3 Ė based electrolyte, Light Metals, 2006

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    Cite this article as:

    Palimaka P and Pietrzyk S. Electrical Conductivity of Cryolite - Based System With Low Melting Temperature. In: Kongoli F, Gaune-Escard M, Mauntz M, Rubinstein J, Dodds H.L., editors. Sustainable Industrial Processing Summit SIPS 2015 Volume 7: Ionic Liquids & Energy Production. Volume 7. Montreal(Canada): FLOGEN Star Outreach. 2015. p. 121-130.