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本文根据前人研究结果,导出了一个计算校正的SiO_2分子分数N′_(SiO_2)的公式。依此式及CaO-SiO_2二元系中logα_(SiO_2)与N_(SiO_2)的关系可以求得液态高炉型熔渣内SiO_2的活度。然后分析了本系列前一文内所提到的122组高炉渣、铁数据,将[%Si]~(1/2)/(α_(SiO_2))~(1/2)与(%S)/[%S]及[%Mn]/(%MnO)分别画成曲线。从曲线的形状得知矽还原度与脱硫及锰还原度间有着平行的关系,但不论矽-硫或矽-锰反应都没有在高炉炉缸内达到平衡。矽-碳反应即矽的还原反应在碱度较高时可能在高炉炉缸内接近平衡。
In this paper, based on the results of previous studies, a formula for calculating the corrected molecular fraction of SiO 2 N ’_ (SiO 2) is derived. According to this formula and the relationship between logα_ (SiO_2) and N_ (SiO_2) in CaO-SiO_2 binary system, the activity of SiO_2 in liquid blast furnace slag can be obtained. Then, the data of 122 blast furnace slag and iron mentioned in the previous article of this series are analyzed and the results show that [% Si] ~ (1/2) / (α SiO 2) ~ (1/2) [% S] and [% Mn] / (% MnO) are plotted as curves respectively. From the shape of the curve, it is found that there is a parallel relationship between Si reduction degree and desulfurization and Mn reduction degree, but neither Si-Si nor Si-Mn reaction balances in the blast furnace hearth. The silicon-carbon reaction, ie, the reduction of silicon, may approach equilibrium in the blast furnace hearth at higher alkalinity.