Abstract
A structural model with three oxygen-containing species:
Al2OF62−, Al2OF84− and Al2O2F42−, is used to calculate their mol fractions in cryolite-alumina melts. For low alumina contents in cryolite all three species are found to be of about equal importance, while Al2O2F42− ions are dominating at high alumina contents. Increasing bath acidity will favour the relative amount of Al2O2F62− ions. Chemical equations for the formation of these species are suggested, as well as possible anode reactions during electrolysis. The occurrence of the anode effect is discussed in terms of the present results.
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Kvande, H. (2016). The Structure of Alumina Dissolved in Cryolite 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_13
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DOI: https://doi.org/10.1007/978-3-319-48156-2_13
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