ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Content of Sodium and Lithium in Aluminium in Equilibrium with Cryolite Melts Experimental Data and Thermodynamic Model

V. Danielik and P. Fellner

Department of Inorganic Technology, Faculty of Chemical Technology, Slovak University of Technology, SK-812 37 Bratislava

Abstract: Equilibrium content of sodium and lithium in aluminium in contact with the melts of the system Na₃AlF₆-AlF₃-LiF-Al₂O₃ (saturated) was investigated at the temperature of 1000°C and/or 15 °C superheat. The excess content of AlF₃ with respect to cryolite was 10 mass % and 20 mass %, respectively. The content of LiF ranged from 0 to 2.5 mass %.A thermodynamic model describing the experimental data on the content of sodium in aluminium is proposed. The model is consistent with the literature data on the vapour pressure over the molten system Na₃AlF₆-AlF₃ and with the phase diagram of this system.

Full paper in Portable Document Format: 524a195.pdf

Chemical Papers 52 (4) 195–198 (1998)