Abstract
Crude tin must undergo separation from impurities to enhance its value and expand its applications. The phase diagrams and physical properties in liquid state of Sn-based alloys are the theoretical basis for vacuum impurity removal from crude tin. The formation of azeotrope affects the effect of impurity removal in vacuum distillation. This study focuses on the correlation between the azeotropic region and the parameters of the Wilson equation of 13 Sn-based binary systems under 10 Pa. The results reveal that the Al–Sn, Cu–Sn, and Ti–Sn systems can form azeotropes that are challenging to separate through straightforward vacuum distillation. In contrast, the other Sn-based binary alloys could not form azeotropes at the experimental conditions, thereby facilitating their removal through vacuum distillation. This method provides a reliable support for the separation and purification of crude tin by vacuum distillation.
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