材料期刊网

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 a previous paper, it has been found that the manganese-sulfur equilibriumis approached in the blast-furnace hearth in agreement with the conelusions of somerecent publications. This paper presents an analysis of the same data used in theprevious paper with a view to investigating the equilibria batween silicon and theother components dissolved in liquid iron sach as salfur, carbon and manganese. It is shown that neither the silicon-sulfur nor the silicon-manganese equilibriumis approached in the blast-furnace hearth, although a parellel relationship existsbetween [%S]~(1/2)/(α_(SiO_2))~(1/2) and (%S)/[%S] and also between [%Si]~(1/2)/(α_(SiO_2))~(1/2)and [%Mn]/(%MnO). By using [%Si]~(1/2)/(α_(SiO_2))~(1/2) as an index ot the degree of silicon reduction,it has been found that an increase in slag basicity promotes silicon reduction in theblast-furnace hearth. Consequently, it is possible for the silicon-carbon reaction toapproach equilibrium in the blast-furnace hearth provided that basicity is highenough. The favorable effect of increasing basicity on the degree of silicon reduc-tion is briefly discussed from the view point of the mechanism of reduction.