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Li L.,Kunming University of Science and Technology | Li L.,State Key Laboratory Breeding Base of Complex Non ferrous Metal Resources Clear Utilization | Li L.,Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province | Tian Y.,Kunming University of Science and Technology | And 11 more authors.
Journal of Central South University | Year: 2013

The feasibility of separation of lead anode slime with low silver by vacuum distillation was analyzed theoretically. The volatilization rates and mass fractions of elements, influenced by distillation temperature, heat preservation time and material thickness, were investigated under laboratory conditions. The experimental results indicate that almost all of lead and bismuth can be separated from silver-contained multicomponent alloy at 1 223 K for 45 min when the chamber pressure maintains at 10-25 Pa. Silver can be easily enriched in the residue and its mass fraction increases from 3.6% to 27.8% when the distillation temperature is between 1 133 K and 1 373 K. Due to the forming of intermetallic compounds Cu2Sb, Cu10Sb3 and Ag3Sb, the antimony could not be evaporated completely during the vacuum distillation. EDS analysis indicates that the condensate has a columnar crystal structure. © 2013 Central South University Press and Springer-Verlag Berlin Heidelberg. Source


Kong L.-X.,Kunming University of Science and Technology | Kong L.-X.,State Key Laboratory Breeding Base of Complex Non ferrous Metal Resources Clear Utilization | Kong L.-X.,Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province | Yang B.,Kunming University of Science and Technology | And 13 more authors.
Journal of Central South University | Year: 2013

The activity of components of Sn-Zn binary alloy system was predicted based on the molecular interaction volume model (MIVM). The calculated values are in good agreement with available experimental data of activities, which indicates that this model is of stability and reliability because the MIVM has a good physical basis. The vapor-liquid phase equilibrium of Sn-Zn alloy system in vacuum distillation was calculated as a function of the activity coefficient. The results show that the content of Sn in vapor phase is 4.2×10 -7 (mass fraction) while in liquid phase it is 90% (mass fraction) at 1 073 K, and the content of Sn in vapor phase increases with increasing the melt temperature and content of Sn in liquid phase. Vacuum distillation experiments were carried out on Sn-Zn alloy for the proper interpretation of the results of the MIVM in the temperature range of 973-1 273 K under pressures of 15-200 Pa. The experimental results show that the content of Sn in vapor phase is 5×10-6 (mass fraction) while in liquid phase it is 90% (mass fraction) under the operational condition of 1 073 K, 100 min and 15 Pa. The experimental results are in good agreement with the predicted values of the MIVM for Zn-Sn binary alloy system. © 2013 Central South University Press and Springer-Verlag Berlin Heidelberg. Source

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