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运用分子相互作用体积模型(MIVM),结合Pb、Sn的无限稀活度系数γ∞Pb、γ∞Sn,通过牛顿迭代法计算出参数Bij和Bji,利用参数Bij和Bji计算Pb-Sn合金中Pb、Sn的活度系数γPb,γSn。并利用γPb,γSn进一步计算出Pb-Sn合金中Pb的分离系数βPb,结果表明βPb》1,Pb、Sn能够彻底地分离。同时用γPb,γSn绘制出气液相平衡图,结果表明,900℃、液相中锡含量为85%时,气相中含锡仅为0.008%。以上热力学分析表明,Pb、Sn能够通过真空蒸馏实现良好分离。进一步实验验证结果表明,900℃、20 min条件下,液相中含锡为85%时,气相中含锡为0.112%,实验结果与预测结果吻合较好。此研究为真空蒸馏分离Pb-Sn合金提供了很好的理论依据和实验基础数据。
Using the molecular interaction volume model (MIVM), combined with the infinite dilute activity coefficients γ∞Pb and γ∞Sn of Pb and Sn, the parameters Bij and Bji are calculated by the Newton’s iteration method, and the Pb-Sn alloy is calculated using the parameters Bij and Bji Pb, Sn activity coefficient γPb, γSn. The PbP separation coefficient βPb in Pb-Sn alloy was further calculated by γPb and γSn. The results showed that βPb "1, Pb and Sn could be completely separated. At the same time, gas-liquid equilibrium diagram was drawn with γPb and γSn. The results show that the tin content in the gas phase is only 0.008% at 900 ℃ with 85% tin in liquid phase. The above thermodynamic analysis shows that Pb and Sn can be well separated by vacuum distillation. Further experimental verification results show that the tin content in the gas phase is 0.112% when the content of tin in the liquid phase is 85% at 900 ℃ for 20 min. The experimental results are in good agreement with the predicted results. This study provides a good theoretical basis and experimental data for the vacuum distillation separation of Pb-Sn alloys.