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基于分子相互作用体积模型(MIVM),计算Pb-Sn-Sb三元合金体系的活度,并使用活度系数计算真空蒸馏过程中Pb-Sn-Sb三元合金体系的气液相平衡。结果表明:随着蒸馏温度和液相中锡含量的增加,气相中锡含量也不断增加;然而,在1100℃液相中锡含量为97%(质量分数)时,气相中锡含量仅为0.45%,分离效果较好。在真空(10 Pa)条件下,在1100～1300℃蒸馏温度范围内进行真空蒸馏分离Pb-Sn-Sb三元合金实验。结果表明:在1100℃时,当液相中锡含量为97%时,气相中锡含量为0.54%。最后对比分析了实验结果和预测值,分析表明实验结果和预测值吻合较好。
Based on MIVM, the activity of Pb-Sn-Sb ternary alloy system was calculated, and the activity coefficient was used to calculate the gas-liquid equilibrium of Pb-Sn-Sb ternary alloy system during vacuum distillation. The results show that the content of tin in the gas phase increases with the increase of distillation temperature and the content of tin in the liquid phase. However, the content of tin in the gas phase is only 0.45% when the content of tin in liquid phase is 97% (mass fraction) at 1100 ℃. %, The separation effect is better. The Pb-Sn-Sb ternary alloy was separated by vacuum distillation under vacuum (10 Pa) at 1100 ~ 1300 ℃. The results show that the content of tin in the gas phase is 0.54% when the content of tin in liquid phase is 97% at 1100 ℃. Finally, the experimental results and the predicted values are compared and analyzed. The analysis shows that the experimental results are in good agreement with the predicted values.