首页|Reduction behavior of iron ore powder by high-volatile coal in thermogravimetric-gas chromatographic and kinetic analysis

Reduction behavior of iron ore powder by high-volatile coal in thermogravimetric-gas chromatographic and kinetic analysis

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The reduction behavior of iron ore powder by high-volatile coal was investigated,and its kinetic mechanism was clarified.The effect of volatiles in coal on the reduction reaction of iron ore was compared by utilizing a Xinjiang lignite with a high volatile content and its pyrolysis carbon produced by high-temperature pyrolysis to remove volatiles,serving as a reductant.The mass loss and gas composition of the samples during the reduction process were detected using thermo-gravimetric analysis and gas chromatography,and the morphological changes of iron ore powder were observed through scanning electron microscopy.The kinetic parameters of the iron oxide reduction reaction were calculated by the Flynn-Ozawa-Wall method,and the kinetic mechanism of volatile participation in the iron oxide reduction reaction was determined through the Coats-Redfern method.The results indicate that the coupling effect between the high-volatile coal pyrolysis and reduction reactions occurs during the second stage of the entire coupling process,which corresponds to the late stage of coal pyrolysis with a substantial release of H2 and CO.The volatiles in coal actively participated in the reduction reaction,reducing the initiation temperature of the reaction by around 200 ℃.The reduction of iron oxides by high-volatile coal was jointly promoted by the"hydrogen cycle"and"carbon cycle",resulting in a higher reduction extent and metallization rate at the end of the reaction.When high-volatile coal was used as the reductant,the average activation energy for the entire process was 76.5 kJ/mol,a significant decrease compared to the employment of pyrolysis carbon without volatiles as the reductant(1167 kJ/mol).

Direct reductionHigh-volatile coalVolatileKineticsReduction mechanism

Rui-meng Shi、Qi-yuan Mi、Bin Li、Xiao Shi、Chong Zou、Jing Guo、Han-jie Guo

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School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,Shaanxi,China

China International Engineering Consulting Corporation,Beijing 100048,China

School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China

China Postdoctoral Science FoundationNatural science Basic Research Program of ShaanxiShaanxi Provincial Department of Education Service Local Special ProjectKey Research and Development Program of Shaanxi

2021M7025532022JQ-42822JC0422021GY-128

2024

10.1007/s42243-023-01143-9

钢铁研究学报(英文版)
钢铁研究总院

钢铁研究学报(英文版)

CSTPCD
影响因子：0.584
ISSN：1006-706X
年,卷(期)：2024.31(1)
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