FeO-Fe_2O_3-SiO_2渣系的作用浓度模型及其应用

Action Concentration Model for Slag System of FeO-Fe_2O_3-SiO_2 and Its Application

基于炉渣结构共存理论,建立了FeO-Fe2O3-SiO2三元渣系的作用浓度模型,计算了1350℃时的作用浓度NFeO和NSiO2,考察了碱度B对它们的影响,并基于该作用浓度模型对铜闪速熔炼过程进行了多相平衡计算.结果表明,理论计算值NFeO、NSiO2与文献实测值αFeO、αSiO2吻合较好,说明作用浓度模型能较好的反映该渣系的结构本质;与采用经验公式计算的活度系数相比,基于作用浓度模型计算的活度系数,铜闪速熔炼多相平衡模拟结果更接近生产实践,表明将炉渣结构共存理论应用于铜闪速熔炼过程热力学研究是可行的.

Under the coexistence theory of slag structure, the action concentration model for slag system of FeO-Fe2O3-SiO2 is built. The action concentration NFeO and Nsio2 are calculated at 1350℃ , and the influence of alkalinity B on them is also investigated. Then the multiphase equilibrium system of copper flash smelting process is studied based on the action concentration model. Results show that the theoretical computational value NFeO and NSiO2 are in good agreement with the reported experiment measured value αFeO and αSiO2, and it is proves that this model can reflect the structure nature of the slag system）The simulation results of copper flash smelting multiphase equilibrium system are closer to practice with the activity coefficients based on the action concentration model than those based on the empirical formulas. The coexistence theory of slag structure can be applied to the thermodynamic research of copper flash smelting process.