Abstract
This paper proposes an equation for the electrical conductivity of multicomponent cryolite-based mixtures. The equation is based on a physical model which assumes that the conductivity is proportional to the number density of the effective electric charges in the melt.
The various authors in the available literature show a great discrepancy in conductivity data of cryolite-based melts. The equation based on the physical model enables determination of which set of data is preferable. Special consideration in this respect is given to the influence of magnesium flouride and lithium flouride additions to the melt.
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References
K. Grjotheim, C. Krohn, M. Malinovsky, K. Matiasovsky, and J. Thonstad, Aluminium Electrolysis-Fundamentals of the Hall-Heroult Process, 2nd ed., Aluminium-Verlag, Dusseldorf, 1982.
B.F. Markov, and L.A. Shumina,“The Relation Between the Concentration and Electrical Conductivity of Fused Binary Salt Systems,” Doklady Akad. Nauk SSSR, 110 (1956) pp. 441–413.
P. Fellner,“The Series and Parallel Models of Electrical Conductivity of Molten Salt Mixtures,” Chem. zvesti, 38 (1984) pp. 159–163.
P. Fellner, K. Grjotheim, and H. Kvande,“Model Calculations of the Electrical Conductivity of Cryolite Melts,” Light Metals 1984, pp. 805–824.
A. Klemm,“Transport Properties of Molten Salts,” in Molten Salt Chemistry, M. Blander, ed., Interscience Publishers, New York, 1964, pp. 537–538.
G.J. Janz, and R.P.T. Tomkins,“Physical Properties Data Compilations Relevant to Energy Storage, IV. Molten Salts: Data on Additional Single and Multi-Component Salt Systems,” U.S. Government Printing Office, Washington, 1981.
G.A. Abramov, and A.A. Kostyukov, see ref. 8, p. 48.
A.I. Belyaev,“Elektrolit alyuminievykh vann,” Metallurgizdat, Moscow, 1961.
P. Fellner, K. Grjotheim, and H. Kvande,“Complex Formation in the Systems NaF-MgF2 and Na3AlF6-MgF2,” Acta Chem. Scand., in press.
K. Matiasovsky, V. Danek, and M. Malinovsky,“Effect of LiF and Li3AlF6 on the Electrical Conductivity of Cryolite-alumina Melts,” J. Electrochem. Soc. 116 (1969) pp. 1381–1383.
E.W. Yim, and M. Feinleib,“Electrical Conductivity of Molten Flourides. II. Conductance of Alkali Flourides, Cryolite and Cryolite-Based Melts,” J. Electrochem. Soc. 104 (1957) pp. 626–630.
A. Vajna, see ref. 1, pp. 159-160.
K. Grjotheim, H. Kvande, and K. Matiasovsky,“Addition of LiF and MgF2 to the Bath of the Hall-Heroult Process,” in Light Metals 1983, pp. 397–411.
J.L. Holm, “Undersokelser av struktur og faseforhold for en del systemer med tilknytning til aluminiumelektrolysen,” Thesis, NTH, 1963, pp. 35–41.
G. Choudhary,“Electrical Conductivity for Aluminum Cell Electrolyte between 950°C-1025°C by Regression Equation,” J. Electrochem. Soc. 120 (1973) pp. 381–383.
Additional information
P. Fellner, K. Grjotheim and H. Kvande are currently engaged in work at the Department of Chemistry of the University of Oslo in Oslo, Norway.
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Fellner, P., Grjotheim, K. & Kvande, H. Electrical Conductivity of Cryolite Melts. JOM 37, 29–32 (1985). https://doi.org/10.1007/BF03258736
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DOI: https://doi.org/10.1007/BF03258736