Fundamentals of reduction of CaO•Fe2O3 in CO/CO2 gas at 1000°C
Fundamentals of reduction of CaO•Fe2O3 in CO/CO2 gas at 1000°C
复制标题
1000℃ CO/CO2 气体中 CaO™ Fe2O3 还原的基本原理
DOI：
10.1080/03019233.2022.2140255
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发表时间：
2022
影响因子：
2.1
通讯作者：
Fengman Shen
中科院分区：
文献类型：
--
作者：
Haiwei An;Xin Jiang;Heng Ji;Zhixin Zhang;Liang He;Haiyan Zheng;Qiangjian Gao;Fengman Shen
铁酸钙是烧结矿中最基本的粘结相，是钙铝硅铁氧体（SFCA）的基体。为了更好地了解CaO·Fe 2 O3的还原机理，采用固相烧结法制备了CaO·Fe 2 O3样品，并在1000°C下用CO/CO2混合气体还原。利用XRD、SEM-EDS等测试手段对复合材料的平衡相和形貌进行了分析。实验结果表明：（1）当CO/（CO + CO2）= 20%时，CaO·Fe 2 O3被还原为CaO·FeO·Fe 2 O3和2CaO·Fe 2 O3。(2)当CO/（CO + CO2）= 40%时，CaO·FeO·Fe 2 O3还原为CaO·3FeO·Fe 2 O3和2CaO·Fe 2 O3，平衡相为CaO·3FeO·Fe 2 O3和2CaO·Fe 2 O3。(3)当CO/（CO + CO2）= 60%时，CaO·3FeO·Fe 2 O3被还原为FeO和2CaO·Fe 2 O3，2CaO·Fe 2 O3仍为稳定相。(4)当CO/（CO + CO2）= 80%时，FeO被还原为金属Fe，2CaO·Fe 2 O3被还原为金属Fe和CaO。这一发现为SFCA的还原研究提供了理论基础。
Calcium ferrite is the most basic bonding phase in sinter and the matrix of Silico-ferrites of calcium and aluminium (SFCA). In order to better understand the fundamentals of the reduction of CaO·Fe2O3, CaO·Fe2O3samples were prepared by solid-state sintering and reduced by CO/CO2mixture gas at 1000°C. Then, the equilibrium phase and morphology were tested by XRD and SEM-EDS. The experimental results indicated that (1) As CO/(CO + CO2) = 20%, CaO·Fe2O3was reduced to CaO·FeO·Fe2O3and 2CaO·Fe2O3. (2) As CO/(CO + CO2) = 40%, CaO·FeO·Fe2O3was reduced to CaO·3FeO·Fe2O3and 2CaO·Fe2O3, the equilibrium phases were CaO·3FeO·Fe2O3and 2CaO·Fe2O3. (3) As CO/(CO + CO2) = 60%, CaO·3FeO·Fe2O3was reduced to FeO and 2CaO·Fe2O3, and 2CaO·Fe2O3was still the stable phase. (4) As CO/(CO + CO2) = 80%, FeO was reduced to metallic Fe, and 2CaO·Fe2O3was reduced to metallic Fe and CaO. The finding from this work may be used as a theoretical foundation for the research of the reduction of SFCA.