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运用分子相互作用体积模型并结合Si、Al二元系的无限稀活度系数γ∞Si、γ∞Al,利用牛顿迭代法计算出对势能相互作用参数BSi,Al和BAl,Si,然后再利用BSi,Al和BAl,Si计算Al-Si二元系中Si和Al的活度系数γSi、γAl和活度aSi、aAl,进一步利用γSi、γAl计算出Al的分离系数βAl和蒸馏过程中Al的挥发速率,同时根据γSi、γAl绘制出Al-Si合金蒸馏过程中的气液相平衡图。研究结果表明:活度计算值与实验值吻合较好,由βAl>>1可预测,通过真空蒸馏能很好地实现Si和Al的分离。此研究为真空蒸馏分离铝硅合金提供了可靠的理论依据及预测模型,对于研究铝硅合金中铝的分离限度具有重要参考作用。
Using the molecular interaction volume model and the infinitesimal dilute activity coefficients γ∞Si, γ∞Al of Si, Al binary systems, the potential energy interaction parameters BSi, Al and BAl, Si were calculated by Newton’s iteration method and then reused BSi, Al and BAl, Si, the activity coefficients of Si and Al in the Al-Si binary system, γSi, γAl, and activity aSi, aAl are calculated. The separation coefficient of Al and the Al Volatilization rate. At the same time, the gas-liquid equilibrium diagram of Al-Si alloy during distillation was plotted based on γSi and γAl. The results show that the calculated values agree well with the experimental values, which can be predicted by βAl >> 1. The separation of Si and Al can be achieved well by vacuum distillation. This study provides a reliable theoretical basis and predictive model for the vacuum distillation separation of aluminum-silicon alloy, for the study of aluminum-aluminum alloy separation limit has an important reference.