Fundamentals of reduction of CaO·Fe2O3 in CO/CO2 gas at 1000°C

IF 1.7 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Ironmaking & Steelmaking Pub Date : 2022-11-09 DOI:10.1080/03019233.2022.2140255

Haiwei An, Xin Jiang, Heng Ji, Zhixin Zhang, Liang He, Hai-yan Zheng, Qiang-jian Gao, F. Shen

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引用次数: 0

Abstract

ABSTRACT 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·Fe2O3 samples were prepared by solid-state sintering and reduced by CO/CO2 mixture 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·Fe2O3 was reduced to CaO·FeO·Fe2O3 and 2CaO·Fe2O3. (2) As CO/(CO + CO2) = 40%, CaO·FeO·Fe2O3 was reduced to CaO·3FeO·Fe2O3 and 2CaO·Fe2O3, the equilibrium phases were CaO·3FeO·Fe2O3 and 2CaO·Fe2O3. (3) As CO/(CO + CO2) = 60%, CaO·3FeO·Fe2O3 was reduced to FeO and 2CaO·Fe2O3, and 2CaO·Fe2O3 was still the stable phase. (4) As CO/(CO + CO2) = 80%, FeO was reduced to metallic Fe, and 2CaO·Fe2O3 was 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.

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1000℃CO/CO2气体中CaO·Fe2O3还原的基本原理

摘要钙铁氧体是烧结矿中最基本的结合相，也是钙铝硅铁氧体（SFCA）的基体。为了更好地了解CaO·Fe2O3还原的基本原理，通过固态烧结制备了CaO·Fe 2O3样品，并在1000°C下用CO/CO2混合气体还原。然后，通过XRD和SEM-EDS对平衡相和形貌进行了测试。实验结果表明：（1）As-CO/（CO） + 二氧化碳） = 20%时，CaO·Fe2O3还原为CaO·FeO·FeO3和2CaO·Fe2O3。（2）作为CO/（CO + 二氧化碳） = 40%时，CaO·FeO·Fe2O3还原为CaO·3FeO·FeO3和2CaO·Fe2O3，平衡相为CaO·3FeO·Fe2O3和2Ca奥·Fe2O3。（3）作为CO/（CO + 二氧化碳） = 60%时，CaO·3FeO·Fe2O3还原为FeO和2CaO·FeO3，2CaO•Fe2O3仍然是稳定相。（4）作为CO/（CO + 二氧化碳） = 80%，FeO还原为金属Fe，2CaO·Fe2O3还原为金属铁和CaO。这项工作的发现可以作为研究SFCA还原的理论基础。

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来源期刊

Ironmaking & Steelmaking 工程技术-冶金工程

CiteScore

3.70

自引率

9.50%

发文量

125

审稿时长

2.9 months

期刊介绍： Ironmaking & Steelmaking: Processes, Products and Applications monitors international technological advances in the industry with a strong element of engineering and product related material. First class refereed papers from the international iron and steel community cover all stages of the process, from ironmaking and its attendant technologies, through casting and steelmaking, to rolling, forming and delivery of the product, including monitoring, quality assurance and environmental issues. The journal also carries research profiles, features on technological and industry developments and expert reviews on major conferences.