CaO-SiO_2-MgO-Al_2O_3-Cr_2O_3渣系黏度结构分析及Iida模型应用

Viscosity-structure analysis of CaO-SiO_2-MgO-Al_2O_3-Cr_2O_3 slags and application of Iida model

为了实现冶炼铬铁合金过程中含铬渣系黏度的精准控制,从微观结构方面研究了碱度及Cr_2O_3质量分数变化对铬铁冶炼渣系黏度的影响并优化了Iida黏度预测模型。通过转筒法测量CaO-SiO_2-MgO-Al_2O_3-Cr_2O_3渣系黏度,结合拉曼光谱从熔渣微观结构方面阐述了Cr_2O_3质量分数及碱度变化对CaO-SiO_2-MgO-Al_2O_3-Cr_2O_3渣系黏度的影响。结果表明,熔渣黏度与其表征聚合度的BO参数值均随Cr_2O_3质量分数的增加而升高,随二元碱度值的增大而降低,熔渣黏度与渣系聚合度变化趋势相一致。根据测量得到的含Cr_2O_3熔渣黏度数据,进一步优化了Iida黏度预测模型。经过优化后的模型计算黏度值与实际测值吻合较好,利用Iida黏度模型可在较大的温度与成分范围内进行含铬渣黏度的预测。

In order to achieve precise control of viscosities of chromium containing slags in ferrochrome process,the effects of varing basicities(the ratio of CaO to SiO2)and Cr2O3 mass percent on the viscosities of the ferrochrome slags in microstructure level were investigated,and the Iida viscosity model was optimized.The viscosities of CaO-SiO2-MgOAl2O3-Cr2O3 slags were measured by rotating cylinder method,and the structures of the slags were examined via Raman spectroscopy to explicate the effects of basicities and Cr2O3 mass percent on viscosities.The results show that the viscosities and the BO values of the slags both increase as the Cr2O3 mass percent increase,but decrease as basicities increase.The viscosities of slags have similar changing tendency with DOP.The Iida viscosity model is further optimized with the measured data.The estimated values by modified Iida model are in good consistence with measured ones,which indicate the viscosities of Cr2O3 containing slags can be properly predicted in a large temperature and composition ranges.