Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 23    No. 8    August 2013

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Application of molecular interaction volume model in separation of Pb-Sn-Sb ternary alloy by vacuum distillation
Ling-xin KONG1,2,3, Bin YANG1,2,3, Bao-qiang XU1,2,3, Yi-fu LI1,2, Liang LI1,2, Da-chun LIU1,2, Yong-nian DAI1

1. National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology,
Kunming 650093, China;
2. State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Clear Utilization in Yunnan Province, Kunming 650093, China;
3. Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming 650093, China

Abstract:Based on the molecular interaction volume model (MIVM), the activities of components of Pb-Sn-Sb ternary alloy were predicted. The vapor-liquid phase equilibrium of Pb-Sn-Sb alloy system was calculated using the activity coefficients of Pb-Sn-Sb alloy system in the process of vacuum distillation. The calculated results show that the content of Sn in vapor phase increases with the increasing distillation temperature and content of Sn in liquid phase. However, the content of Sn in vapor phase is only 0.45% (mass fraction) while 97% in liquid phase at 1100 °C, which shows that the separating effect is very well. Experimental investigations on the separation of Pb-Sn-Sb ternary alloy were carried out in the distillation temperature range of 1100-1300 °C under vacuum condition. It is found that the Sn content in vapor phase is 0.54% while 97% in liquid phase at 1100 °C. Finally, the predicted data were compared with the experimental results showing good agreement with each other.

 

Key words: molecular interaction volume model; vacuum distillation; Pb-Sn-Sb alloy; phase equilibrium

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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