2018 年 59 巻 3 号 p. 443-449
In this work, vacuum distillation experiments of Zn-Al-Fe alloy were performed. A method for predicting the infinite dilute activities in the Zn-Fe system was examined. The activities of components of the Zn-Al-Fe system were calculated based on the Wilson equation. Vacuum distillation of Zn-Al-Fe alloy was discussed based on the experimental investigations of the distillation temperature, the holding time and the thickness of the raw materials mixture by response surface methodology. The results showed that there were remarkable influences of the distillation temperature, holding time and little influence of the thickness of the raw materials mixture on vacuum distillation. The zinc in Zn-Al-Fe alloy were effectively recovered at 800℃–850℃ for 60 min–75 min. This work aims to investigate the vacuum distillation of Zn-Al-Fe alloy to optimize the process for high zinc recovery. After vacuum distillation, the direct yield and volatilization rate for zinc were 99.8% and 99.79% when the distillation temperature was 800℃, and the soaking time was 75 min. The calculations and experimental results demonstrated that this method can guide the vacuum distillation of Zn-Al-Fe alloy based on the Wilson equation.
