CaO-SiO2-MgO-Al2O3四元渣系Al2O3活度预测模型

高炉渣系各组元活度对高炉冶炼和产品质量具有重要的影响作用. 基于分子-离子共存理论，建立CaO-SiO₂-MgO-Al₂O₃四元渣系Al₂O₃活度预测模型;结合试验测定值对其进行验证与修正，最终建立了修正的CaO-SiO₂-MgO-Al₂O₃四元渣系Al₂O₃活度预测模型;同时，依据模型计算结果探究R(w(CaO)/w(SiO₂))，w(MgO)/w(Al₂O₃)和w(Al₂O₃)对Al₂O₃活度的影响. 研究结果表明:修正后的CaO-SiO₂-MgO-Al₂O₃四元渣系Al₂O₃活度预测模型具有较高的预测精度，能够很好地预测熔渣Al₂O₃活度;当w(MgO)/w(Al₂O₃)=0.40，w(Al₂O₃)=20%时，随着R增加，Al₂O₃活度逐渐减小;当R=1.25，w(Al₂O₃)=20%时，随着w(MgO)/w(Al₂O₃)增加，Al₂O₃活度逐渐减小;当w(MgO)/w(Al₂O₃)=0.40，R=1.25时，随着w(Al₂O₃)增加，Al₂O₃活度逐渐增大.

Prediction Model of Al2O3 Activity in CaO-SiO2-Al2O3-MgO Quaternary Slag System

Since the activity of each component of the blast furnace slag has great effects on blast furnace smelting and product quality， a model was built to predict Al₂O₃ activity in CaO-SiO₂-Al₂O₃-MgO quaternary slag system， based on the molecule and ion coexistence theory. After the prediction model was validated by the experimental results， the effects of the R(w(CaO)/w(SiO₂))，w(MgO)/w(Al₂O₃) and w(Al₂O₃) on Al₂O₃ activity were explored. The results indicate that the model can predict the Al₂O₃ activity of molten slag accurately. When the w(Al₂O₃) was 20% and w(MgO)/w(Al₂O₃) was 0.40， the Al₂O₃ activity decreased with the increasing R. When the w(Al₂O₃) was 20% and R was 1.25， the Al₂O₃ activity decreased with the increasing w(MgO)/w(Al₂O₃). With the R=1.25 and w(MgO)/w(Al₂O₃) =0.40， the Al₂O₃ activity increased with the increasing w(Al₂O₃).