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Electrical Conductivity of Molten Cryolite-Based Mixtures Obtained with a Tube-type Cell Made of Pyrolytic Boron Nitride

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Essential Readings in Light Metals

Abstract

A pyrolytic boron nitride tube-type cell was used to measure the electrical conductivity for molten cryolite, for binary mixtures of cryolite with Al2O3, AlF3, CaF2, KF, Li3AlF6, and MgF2, and for ternary mixtures Na3AlF6 - Al2O3 - CaF2 (MgF2) and Na3AlF6 - AlF3 - KF (Li3AlF6). The cell constant was about 40 cm−1. The temperature and concentration dependence of the conductivity in the investigated concentration range was described by the equation

$$\begin{gathered} \ln \kappa =1.977-0.0200\left[ {A{{l}_{2}}{{O}_{3}}} \right]-0.0131\left[ {Al{{F}_{3}}} \right]-0.0060\left[ {Ca{{F}_{2}}} \right] \hfill \\ \quad \;\;\;-0.0106\left[ {Mg{{F}_{2}}} \right]-0.0019\left[ {KF} \right]+0.0121\left[ {LiF} \right]-1204.3/T \hfill \\ \end{gathered}$$

where T represents the temperature in K, and the brackets denote the concentration of the additives in wt%.

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Author notes

  1. J. Híveš & P. Fellner

    Present address: Department of Inorganic Technology, Slovak Technical University, Radlinského 9, 812 37, Bratislava, Slovakia

Authors and Affiliations

  1. Department of Electrochemistry, Norwegian Institute of Technology, University of Trondheim, N-7034, Trondheim, Norway

    J. Híveš, J. Thonstad, Å. Sterten & P. Fellner

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    Geoff Bearne (General Manager) (General Manager)

  2. Rio Tinto Technology and Innovation, UK

    Geoff Bearne (General Manager) (General Manager)

  3. Alcoa Technical Center, New Kensington, Pennsylvania, USA

    Gary Tarcy (Manager of Smelting R&D) (Manager of Smelting R&D)

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Híveš, J., Thonstad, J., Sterten, Å., Fellner, P. (2016). Electrical Conductivity of Molten Cryolite-Based Mixtures Obtained with a Tube-type Cell Made of Pyrolytic Boron Nitride. In: Bearne, G., Dupuis, M., Tarcy, G. (eds) Essential Readings in Light Metals. Springer, Cham. https://doi.org/10.1007/978-3-319-48156-2_9

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