ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
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Cryolite Corner of the Phase Diagram of the Ternary System NaF—AIF3—KF

J. Gabčová, M. Marko, and P. Fellner

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

 

Abstract: Experimental data on solid-liquid phase equilibria of sodium cryolite corner of the ternary system NaF-AIF3-KF are presented. Composition was changed in the following range: x(NaF)/mole % = 40-80; x(AIF3)/mole % = 20-40; x (KF)/mole % = 0-20. A formal model of molten cryolite-based mixtures was used for description of the obtained experimental data. The model assumes that all KF reacts with AIF3 under formation of K3AIF6 and all remaining AIF3 reacts with sodium cryolite under formation of NaAIF4. For the temperature of primary crystallization it holds   θtpc/°C = 1009.17 - 235.44 y(K3AlF6) - 10.95 y(NaAIF4) - 638.91 [y(NaAIF4)]4 This equation holds in the following range of compositions: 25-35 mole % AIF3, 0-20 mole % KF. Standard deviation equals 1.86 K.

Full paper in Portable Document Format: 491a13.pdf

 

Chemical Papers 49 (1) 13–15 (1995)

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