Abstract
The solubility of aluminium in NaF–AlF3 melts saturated with alumina has been investigated by analyzing quenched samples of the melts to determine the contents of metallic sodium and aluminium. The total solubility at 1 000 °C given as wt. % Al decreases with decreasing NaF/AlF3 molar ratio from 0.33 wt. % Al at NaF/AlF3 = 6.70 to 0.10 wt. % Al in cryolite (NaF/AlF3 = 3) and 0.075 wt. % Al at NaF/AlF3 = 1.70. The change in the solubility is primarily due to a change in the sodium content, while the aluminium content remains almost constant over the range investigated. The solubility in cryolite increases with increasing temperature from 0.10 wt. % Al at 1 000 °C to 0.14 wt. % Al at 1 060 °C. In cryolite at 1 000 °C the dissolved metal was found to consist of 0.065 wt. % Al and 0.090 wt. % Na. The fraction of the dissolved metal represented by sodium increases with increasing temperature.
Publisher
Canadian Science Publishing
Subject
Organic Chemistry,General Chemistry,Catalysis
Cited by
44 articles.
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