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Solubility of Aluminum in Cryolite-Based Melts

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Abstract

The solubility of aluminum in NaF-AlF3-Al2O3 melts was investigated between 800 °C and 960 °C. The amount of dissolved metal in rapidly cooled samples was analyzed by the reaction with hydrochloric acid under the formation of hydrogen—the volume of which then was determined. Four thermodynamic models that describe the high-temperature equilibrium of aluminum reactions with the NaF-AlF3 melt were proposed. The best fit for the experimental data was obtained by assuming the existence of a monovalent aluminum species, AlF and \( {\text{AlF}}_{ 2}^{ - } , \) as well as elemental sodium.

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Acknowledgment

This work was supported by the Slovak Grant Agency (VEGA 1/0535/08)

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Authors and Affiliations

  1. Institute of Inorganic Chemistry, Technology and Materials, Slovak University of Technology, SK-812 37, Bratislava, Slovakia

    V. Danielik (Associate Professor), P. Fellner (Professor) & A. Sýkorová (PhD Student)

  2. Department of Materials Science and Engineering, Norwegian University of Science and Technology, N-7491, Trondheim, Norway

    J. Thonstad (Emeritus Professor)

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  1. V. Danielik
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  2. P. Fellner
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  3. A. Sýkorová
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  4. J. Thonstad
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Correspondence to V. Danielik.

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Manuscript submitted March 10, 2008.

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Danielik, V., Fellner, P., Sýkorová, A. et al. Solubility of Aluminum in Cryolite-Based Melts. Metall Mater Trans B 41, 430–436 (2010). https://doi.org/10.1007/s11663-009-9329-9

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