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本文介绍了用于计算四元均相系中组元活度的SELF-SReM4高阶亚正规溶液模型.模型由一组参数表示，根据精选的“边界条件”.可由二元系、三元系、四元系逐渐展开拟合出该组参数.用该模型计算了Mno－SiO2－al2O3－CaO四元系，包括四个三元子系中各组元的活度.SiO2－al2O3－CaO三元系的SiO2活度计算值与实验值和其它计算结果较一致；MnO-SiO2－CaO三元系计算结果与渣-金属平衡试验结果较一致
In this paper, a SELF-SReM4 high-order subnormal solution model for calculating the activity of a component in a quaternionic system is presented. The model is represented by a set of parameters that can be selected by the binary conditions, ternary System and the quaternion system, the parameters of this group are gradually fitted out.The activity of each component in Mno-SiO2-al2O3-CaO quaternary system, The calculated values of SiO2 activity of the ternary system are in good agreement with the experimental results and other calculated results. The calculated results of the MnO-SiO2-CaO ternary system are in good agreement with the results of the slag-metal equilibrium test