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Essential Readings in Light Metals pp 39–48Cite as

The Solubility of Aluminium in Cryolitic Melts

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Abstract

The solubility of aluminium in NaF-AlF3-Al2O3 melts with various additives was found to increase with increasing NaF/AlF3 molar ratio (CR) and increasing temperature and to decrease with additions of Al2O3, CaF2, MgF2 and LiF to the melts. The following empirical equation was derived;

$$\begin{gathered} \log \left( {{{c}_{{Al}}}} \right)=1.8251-0.5919/CR-3.429\cdot {{10}^{3}}/T \hfill \\ \quad \quad \quad \;\;-3.39\cdot {{10}^{{-3}}}\cdot {{c}_{{A{{l}_{2}}{{O}_{3}}}}}-2.49\cdot {{10}^{{-2}}}\cdot {{c}_{{LiF}}} \hfill \\ \quad \quad \quad \;\;-2.41\cdot {{10}^{{-2}}}\cdot {{c}_{{Mg{{F}_{2}}}}}-2.03\cdot {{10}^{{-2}}}\cdot {{c}_{{CA{{F}_{2}}}}} \hfill \\ \end{gathered}$$
(1)

where all concentrations are in wt% and T is the temperature (K).

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Authors and Affiliations

  1. Laboratories of Industrial Electrochemistry and the Electrolysis Group of SINTEF, The Norwegian Institute of Technology, N-7034, Trondheim-NTH, Norway

    R. Ødegård, Å. Sterten & J. Thonstad

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  1. R. Ødegård
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  2. Å. Sterten
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  1. Technology Delivery Systems, UK

    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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Ødegård, R., Sterten, Å., Thonstad, J. (2016). The Solubility of Aluminium in Cryolitic Melts. 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_6

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