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首页> 外文期刊>ISIJ international >Role of MgO in Sinter from Perspective of MgO Distribution between Liquid and Magnetite Phases in FeOx–CaO–SiO2–MgO System
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Role of MgO in Sinter from Perspective of MgO Distribution between Liquid and Magnetite Phases in FeOx–CaO–SiO2–MgO System

机译：从FeO x –CaO–SiO 2 –MgO系统中液相和磁铁矿之间的MgO分布角度看，MgO在烧结矿中的作用

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摘要

The chemical compositions of liquid in equilibrium with FeO_(x) in the FeO_(x)–CaO–SiO_(2)–MgO system at 1573 K and oxygen partial pressures of 10~(?7) atm and 10~(?6) atm have been determined along with the MgO concentrations in the liquid and FeO_(x) phases to understand the role of MgO in improvement of reducibility of the sinter produced from deteriorated iron ores. The liquid area in the FeO_(x)–rich side was decreased with additions of MgO over the measurement range of C/S ratios between 0.32 and 2.28, and was separated into silicate–based and calcium ferrite–based liquid phases, where 2CaO·SiO_(2) phase becomes stable thermodynamically in the C/S ratios between 1.66 and 1.96. The ratio of MgO concentration in the liquid phase to that in the FeO_(x) phase decreased with increasing C/S ratio from 0.36 to 2.28, which trend has been explained from the viewpoint of basicity. On the basis of these findings, the role of MgO in improvement of reducibility of the sinter has been discussed to conclude that additions of MgO make the cohesive zone thinner and improves the gas permeability in a blast furnace.
机译：在1573 K和10〜（？7）atm和10〜（？6）的氧分压下，FeO_（x）–CaO–SiO_（2）–MgO系统中与FeO_（x）平衡的液体的化学成分已经确定了atm以及液相和FeO_（x）相中的MgO浓度，以了解MgO在改善由劣化铁矿石产生的烧结矿的还原性中的作用。在C / S比的测量范围为0.32至2.28的范围内，随着添加MgO的增加，富FeO_（x）侧的液体面积减少，并分为硅酸盐基和铁酸钙基液相，其中2CaO· SiO_（2）相在1.66和1.96之间的C / S比中热力学稳定。随着C / S比从0.36增加到2.28，液相中的MgO浓度与FeO_（x）相中的浓度比降低，这已经从碱性的角度解释了。基于这些发现，已经讨论了MgO在提高烧结矿还原性中的作用，从而得出结论，MgO的添加使粘结区变薄并且提高了高炉中的气体渗透性。

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