Comparison of Microstructures of Magnetite Reduced by H2 and CO under Microwave Field

The reduction of magnetite in H2 and CO atmospheres was compared using a microwave-heating technique. The reduction of magnetite in a mixed H2 + CO atmosphere was compared with respect to the effects of a microwave field and a conventional field. Microstructural changes were observed using an electr...

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Bibliographic Details
Published inMetals (Basel ) Vol. 13; no. 8; p. 1367
Main Authors Zhou, Meijie, Ai, Liqun, Hong, Lukuo, Sun, Caijiao, Yuan, Yipang, Tong, Shuai
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2023
Subjects
Carbon
Energy consumption
Experiments
Gas flow
H2 reduction
Heating
Iron
Iron compounds
Magnetite
Metallizing
microstructural characterization
Microstructure
Microwave heating
Particle size
Radiation
China
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Summary:The reduction of magnetite in H2 and CO atmospheres was compared using a microwave-heating technique. The reduction of magnetite in a mixed H2 + CO atmosphere was compared with respect to the effects of a microwave field and a conventional field. Microstructural changes were observed using an electron microscope. The results show that the metallization rate and reduction degree of the H2-reduced magnetite are much higher than those of the magnetite reduced by CO at 900–1100 ℃. The Fe phase generated by H2 reduction forms a cavity structure, and the Fe phase generated by CO reduction forms a dense block. Under conventional heating conditions, the higher the H2 content in a pure CO atmosphere, the better the reduction effect. Under the effect of a microwave field, the atmosphere with the highest reduction rate was 50% H2 + 50% CO. Compared with conventional heating, the bubble holes formed by reduced iron in microwave field are larger under the same conditions.
ISSN:2075-4701
2075-4701
DOI:10.3390/met13081367