Application of MIVM for Pb-Sn System in Vacuum Distillation

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• 作者：Lingxin Kong (1) (2) (3)
  Bin Yang (1) (2) (3)
  Yifu Li (1) (2) (3)
  Baoqiang Xu (1) (2) (3)
  Dachun Liu (1)
  Guobin Jia (1) (2) (3)
  
• 刊名：Metallurgical and Materials Transactions B
• 出版年：2012
• 出版时间：December 2012
• 年：2012
• 卷：43
• 期：6
• 页码：1649-1656
• 全文大小：491KB
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• 作者单位：Lingxin Kong (1) (2) (3)
  Bin Yang (1) (2) (3)
  Yifu Li (1) (2) (3)
  Baoqiang Xu (1) (2) (3)
  Dachun Liu (1)
  Guobin Jia (1) (2) (3)
  
  1. The National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming, 650093, P.R. China
  2. State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Clear Utilization in Yunnan Province, Kunming, 650093, P.R. China
  3. Yunnan Provincial Key Laboratory of Nonferrous Vacuum Metallurgy, Kunming, 650093, P.R. China
  
• ISSN：1543-1916

文摘

The activity coefficients of components of the Pb-Sn binary alloy system were calculated based on the molecular interaction volume model (MIVM). A significant advantage of this model lies in its ability to predict the thermodynamic properties of liquid alloys using only two binary infinite activity coefficients. Based on the MIVM, the vapor-liquid phase equilibrium of the Pb-Sn alloy system in vacuum distillation has been predicted using the activity coefficients of Pb and Sn. The results showed that the content of tin in the vapor phase was 0.008聽wt聽pct, while in the liquid phase, it was 83聽wt聽pct at 1173聽K (900聽掳C); it reached 0.022聽wt聽pct in the vapor phase, while in the liquid phase, it was 92聽wt聽pct at 1223聽K (950聽掳C); and it was 0.052聽wt聽pct in the vapor phase, while in the liquid phase, it was 97.88聽wt聽pct at 1273聽K (1000聽掳C). The content of tin in the vapor phase increased with the distillation temperature increasing. Experimental investigations into the separation of Pb and Sn from the Pb-Sn alloy by vacuum distillation were carried out for the proper interpretation of the results of the model. The influence of the distillation time (20 to 80聽minutes) and the distillation temperatures of 1173聽K, 1223聽K, and 1273聽K (900聽掳C, 950聽掳C, and 1000聽掳C) on the separating effect was also studied. The experimental results showed that the content of tin in the vapor phase was 0.085聽wt聽pct, while in liquid phase, it was 83聽wt聽pct under the operational conditions of distillation temperature of 1173聽K (900聽掳C), evaporation time of 20聽minutes, and chamber pressure of 20聽Pa; it reached 0.18聽wt聽pct in the vapor phase, while in the liquid phase, it was 92聽wt聽pct at 1223聽K (950聽掳C), 20聽minutes, and 20聽Pa; and it was 0.35聽wt聽pct in the vapor phase, while in the liquid phase, it was 97.88聽wt聽pct at 1273聽K (1000聽掳C), 20聽minutes, and 20聽Pa. In all these experiments, it was observed that the content of tin in the vapor phase increased as the distillation time and temperatures were increased. The experimental results are in good agreement with the predicted values of the MIVM for the Pb-Sn binary system.