Fundamentals of the Reduction of SFC in CO/CO2 Gas at 1 000°C
Fundamentals of the Reduction of SFC in CO/CO2 Gas at 1 000°C
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1000℃下CO/CO2气体中SFC还原的基本原理
DOI：
10.2355/isijinternational.isijint-2020-064
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发表时间：
2020-01-01
影响因子：
1.8
通讯作者：
Shen, Fengman
中科院分区：
文献类型：
--
作者：
Jiang, Xin;Yu, Jiaxin;Shen, Fengman
SFC(钙硅铁氧体)是一种不含Al_2O_3的简化钙铝硅铁氧体(SFCA)。SFC和SFCA被认为是烧结矿中最理想的结合相。为了更好地了解SFC还原的基本原理，本工作对SFC还原进行了一系列实验，包括X射线衍射仪测试的相平衡、扫描电子显微镜-能谱仪测试的形貌以及1000℃下不同CO/CO2混合气体下的还原路径。实验结果表明：(1)在CO=20%和40%的情况下，SFC中的Fe2O主要被还原为FeO。平衡相为FeO、CaO中心点Fe2O_3和CaO中心点SiO_2。(2)在CO=60%的情况下，CaO中心点状Fe_2O_3被还原为FeO和2CaO-Fe_2O_3。平衡相为FeO、2CaO心点Fe2O_3和CaO心点SiO_2。(3)在CO=80%和90%时，FeO被还原为Fe，2CaO中心点Fe_2O_3被还原为Fe和CaO。平衡相为Fe、CaO和CaO中心点SiO_2。研究结果可为提高烧结生产和高炉性能提供指导。
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 1 000 degrees 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 center dot Fe2O3, and CaO center dot SiO2. (2) In the case of CO = 60%, CaO center dot Fe2O3 was reduced to generate FeO and 2CaO-Fe2O3. The equilibrium phases were FeO, 2CaO center dot Fe2O3, and CaO center dot SiO2. (3) In the case of CO = 80% and 90%, FeO was reduced to Fe, and 2CaO center dot Fe2O3 was reduced to generate Fe and CaO. The equilibrium phases were Fe, CaO, and CaO center dot SiO2. The findings from this work may provide guidelines for the improvement of sintering production and blast furnace performances.