CaO-SiO_(2)-MgO-Al_(2)O_(3)四元渣系Al2O3活度预测模型

Prediction Model of Al2O3 Activity in CaO-SiO_(2)-Al_(2)O_(3)-MgO Quaternary Slag System

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-SiO 2-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-SiO 2-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-SiO 2-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.

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-SiO 2-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(SiO 2)),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).