SFC (Sillico-Ferrite of Calcium) is a kind of simplified SFCA (Sillico-Ferrite of Calcium and Aluminum) with no Al₂O₃. SFC and SFCA are believed to be the most desirable bonding phase in sinter. In order to better understand the fundamentals of the reduction of SFC, a series of experiments on the SFC reduction were carried out in the present work, including phase equilibria tested by XRD, morphology tested by SEM-EDS, and reduction pathway under the different CO/CO₂ mixture gas at 1000°C. The experimental results indicated, (1) in the case of CO = 20% and 40%, most of Fe₂O₃ in SFC was reduced to FeO. The equilibrium phases were FeO, CaO·Fe₂O₃, and CaO·SiO₂. (2) In the case of CO = 60%, CaO·Fe₂O₃ was reduced to generate FeO and 2CaO·Fe₂O₃. The equilibrium phases were FeO, 2CaO·Fe₂O₃, and CaO·SiO₂. (3) In the case of CO = 80% and 90%, FeO was reduced to Fe, and 2CaO·Fe₂O₃ was reduced to generate Fe and CaO. The equilibrium phases were Fe, CaO, and CaO·SiO₂. The findings from this work may provide guidelines for the improvement of sintering production and blast furnace performances.

SFC（钙硅铁素体）是一种不含Al ₂ O ₃的简化SFCA（钙铝硅铁素体）。人们认为SFC和SFCA是烧结矿中最理想的粘结阶段。为了更好地了解SFC还原的基本原理，本文进行了一系列的SFC还原实验，包括XRD测试的相平衡，SEM-EDS测试的形态以及不同CO下的还原途径。 / CO ₂混合气体在1000°C下。实验结果表明：（1）在CO = 20％和40％的情况下，SFC中的大部分Fe ₂ O ₃还原为FeO。平衡相为FeO，CaO·Fe ₂ O ₃和CaO·SiO₂。（2）在CO ＝ 60％的情况下，将CaO·Fe ₂ O ₃还原而生成FeO和2CaO·Fe ₂ O ₃。平衡相为FeO，2CaO·Fe ₂ O ₃和CaO·SiO ₂。（3）在CO ＝ 80％和90％的情况下，FeO被还原成Fe，并且2CaO·Fe ₂ O ₃被还原而生成Fe和CaO。平衡相为Fe，CaO和CaO·SiO ₂。这项工作的发现可能为提高烧结产量和高炉性能提供指导。