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Solubility of Al2O3 in Some Chloride−Fluoride Melts

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posted on 04.09.2006, 00:00 by Vyacheslav N. Baumer, Sergey S. Galkin, Lidiya V. Glushkova, Tatyana P. Rebrova, Zoya V. Shtitelman
Alumina solubility in chloride−fluoride melts of KCl−NaCl−NaF mixtures with ratios of 0.425:0.425:0.15 (I), 0.38:0.38:0.24 (II), and 0.35:0.35:0.30 (III) (molar fractions) was investigated in the 973−1123 K temperature range using the isothermal saturation method. Al2O3 solubility in the ionic melts studied was shown to be on the order of 0.06 g kg-1 for system I, 0.12 g kg-1 for system II, and 0.14 g kg-1 for system III at 1073 K. All the “Al2O3 + melt” systems were found to demonstrate negative deviations from the ideal solutions. The solubility of Al2O3 in all the melts increases with the temperature increase; however, the dependences of −log NAl2O3 versus T-1 were characterized by the slopes (2.6 ± 0.4) × 103 K (I and II) and (2.4 ± 0.6) × 103 K (III), which were considerably less than the slope predicted by the Shreder−Le Chatelier equation (∼5.8 × 103).