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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Aluminum Reduction Technology
Presentation Title Influence of Additives on Alumina Dissolution in Superheated Cryolite Melts
Author(s) Jonathan Alarie, László I. Kiss, Sándor Poncsák, Renaud Santerre, Sébastien Guérard, Jean-François Bilodeau
On-Site Speaker (Planned) Jonathan Alarie
Abstract Scope Alumina dissolution is of first concern in modern electrolysis cells. The rate of dissolution strongly depends on the physical and chemical conditions in the cryolitic melts. In this work, the alumina dissolution rate has been monitored with the gravimetric methods in NaF-AlF3-CaF2-Al2O3 systems. To evaluate the main influences of the additives and the superheat, a parametric study has been conducted. A wide range of additives content have been studied to fit industrial conditions. Thus, bath compositions with different liquidus temperatures, in the range from 924 °C to 970 °C, were used to dissolve alumina at fixed superheat. Results show consistency with physicochemical expectations so that the additives content decreases the alumina dissolution rate and the superheat increase this rate. Then the experimentally obtained correlations can help to adjust the parameters to obtain the desired rate of dissolution.
Proceedings Inclusion? Planned: Light Metals
Keywords Aluminum, Electrometallurgy, Ceramics

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