(1. 昆明理工大学 真空冶金国家工程实验室昆明，昆明650093；
2. 昆明理工大学 云南省有色金属真空冶金重点实验室昆明，昆明650093；
3. 昆明理工大学 复杂有色金属资源清洁利用国家重点实验室，昆明650093)
摘 要: 采用正规溶液模型、亚正规溶液模型以及分子相互作用体积模型(MIVM)预测了Pb-Sb、Pb-Sn、Pb-Bi、Pb-Ag、Pb-Cu、合金组元的活度，并计算了模型的预测偏差。结果表明：MIVM的平均相对偏差均小于10.7550%，绝对偏差小于0.0481，采用MIVM预测铅基合金组元的活度是可靠的。在此基础上，采用MIVM，结合真空冶金及气液平衡理论，建立了二元合金体系的气-液平衡(Vapor-liquid equilibrium, VLE)预测模型。采用模型计算了上述铅基合金的VLE数据，并绘制了VLE相图(包括T-x(y)和p-x(y)相图)，最后采用VLE实验数据对其可靠性进行了检验，结果表明：VLE的模型预测值与实验值吻合，本文建立的铅基合金体系气-液平衡预测模型是可靠的，为铅基合金真空蒸馏设备的改进及过程控制、优化提供了可靠的模型。
关键字: 真空蒸馏；铅基合金；活度；VLE；热力学模型
（1. National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China？
2. Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China？
3. State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Clear Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:the activity of Pb-Sb, Pb-Sn, Pb-Bi, Pb-Ag, Pb-Cu alloys was predicted by the regular solution model, the sub-regular solution model and the molecular interaction volume model (MIVM).The prediction deviation of the model was calculated. The results show that the average relative deviation of MIVM is less than 10.7550% and the absolute deviation is less than 0.0481. The activity of MIVM prediction of the lead based alloy components is reliable. On this basis, the vapor liquid equilibrium prediction model of binary alloy system was established using MIVM, vacuum metallurgy and theory of vapor liquid equilibrium. The VLE data of the lead based alloy were calculated by the model, and the VLE phase diagram (including T-X-y) and P-X-y) phase diagram) was drawn. Finally, the reliability was tested by the experimental data of VLE. The results show that the predicted value of the model is in agreement with the experimental value. The prediction model of the vapor liquid equilibrium of the lead based alloy system established in this paper is feasible. It provides a reliable model for improvement and process control and optimization of lead based alloy vacuum distillation equipment.
Key words: vacuum distillation; lead based alloy; activity; VLE; thermodynamic model
