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本文根据已有的热力学及分配数据算出了液态高炉型熔渣内MnO的活度系数与碱度间的关系如图3所示。计算结果显示碱度愈高,温度愈低,则MnO的活度系数亦愈大。如Темкин模型可以适用于液态CaO—MnO—SiO_2系统,则CaO与MnO的活度系数在一定碱度与温度的条件下应该相等(分别以液态CaO与MnO为标准状态),但作者的计算结果显示后者约为前者的4—5倍。这个差异表明Темкин的理想溶液模型不能適用于CaO—MnO—SiO_2系统,一个可能的解释是Ca~(++)与SiO_4~(4-)间组成了稳定的离子偶。
Based on the existing thermodynamics and distribution data, this paper calculates the relationship between activity coefficient and basicity of MnO in liquid blast furnace slag. The calculation results show that the higher alkalinity, the lower the temperature, the greater the activity coefficient of MnO. If the Темкин model can be applied to a liquid CaO-MnO-SiO 2 system, the activity coefficients of CaO and MnO should be equal at certain alkalinity and temperature (with liquid CaO and MnO as standard respectively), but the authors’ calculations Show the latter is about 4-5 times the former. This difference indicates that the ideal solution model of Темкин can not be applied to the CaO-MnO-SiO 2 system. One possible explanation is that Ca ~ (++) and SiO_4 ~ (4-) form a stable ionic couple.