MIVM对含V_2O_3多元熔渣体系组元活度的预测

Prediction of multi-component activities in molten slags containing V_2O_3 by model of MIVM

为了研究钒在攀钢转炉中的热力学行为及分配,根据钒渣的成分对Ca O-Mg O-Al_2O_3-V_2O_3-Si O_2熔渣中各组元的活度进行研究。应用分子相互作用体积模型(MIVM)及其伪多元法预测Mg O-Al_2O_3-Si O_2、Ca O-V_2O_3-Si O_2、Ca OMg O-Al_2O_3-Si O_2渣系中某组元的活度值,并与试验值对比。结果表明,MIVM伪多元法预测值与试验值吻合良好,Mg O-Al_2O_3-Si O_2渣系中Al_2O_3的平均相对误差为15%;Ca O-V_2O_3-Si O_2渣系中V_2O_3的平均相对误差为33%;Ca O-Mg OAl_2O_3-Si O_2渣系中Si O_2的平均相对误差为13%。在此基础上,利用MIVM预测Ca O-Mg O-Al_2O_3-V_2O_3-Si O_2熔渣中各组元的活度,并将V_2O_3的预测值与试验值对比分析,结果表明,预测值与试验值吻合良好,都呈正偏差,平均相对误差为44%,V_2O_3的活度随碱度的提高而下降。

In order to study the thermodynamic behavior and distribution of vanadium in Panzhihua＇s converter,it is necessary to investigate the activity of each component in Ca O-Mg O-Al2O3-V2O3-Si O2 molten slag,according to the compositions of vanadium slag. The study applied the model of molecular interaction volume（MIVM） and its pseudo-multicomponent approach to predict the activities in slag system,such as Al2O3-Ca O-Mg O,Ca O-Si O2-V2O3,and Ca O-Mg O-Al2O3-Si O2 slag system. The results of prediction were compared with the experimental data. The results showed that the predicted values of activity by MIVM pseudo-multicomponent approach were in good agreement with experimental data. In the Al2O3-Ca O-Mg O slag system,the predicted average relative error of Al2O3 activity was 15% by MIVM. In the Ca O-Si O2-V2O3,Ca O-Mg O-Al2O3-Si O2 systems,the predicted average relative errors of the activity of V2O3 and Si O2 were 33% and13% by MIVM. On this basis,the application of MIVM predicted the activities of each component in the slag system of Ca O- Mg O- Al2O3- V2O3- Si O2,and the predicted activity of V2O3 was compared with the experimental data. The results showed that the predicted values were in good agreement with experimental data,and both the positive deviation and the average relative errors were 44%. the V2O3 activity decreased with the increase of basicity.