CaO-SiO2-Al2O3-Na2O-TiO2-（MgO）渣系与碳饱和铁液间硫分配比的热力学模型  

A thermodynamic model for calculation of sulfur distribution ratio between CaO-SiO2-Al2O3-Na2O-TiO2-（MgO）slags and carbon saturated hot metal

作　　者：张康晖 张延玲 李凤善 吴拓 ZHANG Kang-hui;ZHANG Yan-ling;LI Feng-shan;WU Tuo(State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室

出　　处：《钢铁研究学报》2018年第4期265-272,共8页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51474021)

摘　　要：炉渣离子与分子共存理论（IMCT）认为,渣中结构单元或离子对的作用浓度能像传统意义上的熔渣活度一样表征化学反应能力。通过建立CaO-SiO2-Al2O3-Na2O-TiO2-（MgO）渣系结构单元或离子对的作用浓度控制方程,并运用Matlab求解作用浓度,从而建立1 450℃下该渣系与碳饱和铁液间硫分配比的热力学模型。模型计算的硫分配比与文献实测的硫分配比吻合较好,有助于预测熔渣与碳饱和铁液间的硫分配比。通过模型能计算出渣中CaO、Na2O和MgO各自的硫分配比及总的硫分配比,分析总的硫分配比受其他因素影响的变化趋势;计算出渣中CaO和Na2O各自对总硫分配比的贡献率,描述CaO和Na2O各自硫分配比贡献率受其他因素影响的变化趋势。The ion and molecule coexistence theory（IMCT）indicates that the mass action concentrations of structural units or ion couples in slags can represent the chemical reaction ability as the traditional slags activity.By establishing the mass action concentrations equations of structural units or ion couples in the CaO-SiO2-Al2 O3-Na2O-TiO2-（MgO）slags,the mass action concentrations were solved by Matlab,so as to build a thermodynamic model for calculating the sulfur distribution ratio between slags and carbon saturated hot metal under 1450℃.The calculated sulfur distribution ratio of model agrees well with the experimental sulfur distribution ratio,which can help to predict the sulfur distribution ratio between slags and carbon saturated hot metal.The thermodynamic model can quantitatively determine the respective sulfur distribution ratio of CaO,Na2O and total sulfur distribution ratio in slags.Through the calculated results,the influencing factors on total sulfur distribution ratio were analyzed.In addition,the model can quantitatively calculate the contribution of CaO and Na2O on total sulfur distribution ratio,and qualitatively describe their trend affected by other factors.

关 键 词：硫分配比 共存理论 作用浓度 铁水预脱硫 热力学模型 

分 类 号：TF701[冶金工程—钢铁冶金]