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A Kinetic Study on the Reduction of Single Magnetite Particle with Melting Products at High Temperature Based on Visual and Surface Analytical Techniques

文献类型：期刊论文

作者Shen, Zhongjie1; Sun, Shuang1; Zhu, Yulong1; Han, Dong1; Du, Zhan2; Liu, Haifeng1
刊名METALS
出版日期2021-08-01
卷号11期号:8页码:15
关键词ironmaking single magnetite particle high-temperature reduction melting product reaction kinetics
DOI10.3390/met11081268
英文摘要In this study, the reduction characteristics of single magnetite particles with melting products at high temperature were investigated by using visualization and surface analytical techniques. The morphology evolution, product type, reduction degree, and reduction rate of single magnetite particles during the reduction process were analyzed and compared at different reduction temperatures. The results showed that the morphology of the product formed at the reduction temperature of 1300 degrees C was a mainly nodular structure. When the reduction temperature was above 1400 degrees C, the products were melted to liquid and flowed out of the particle to form a layered structure. The morphology of the melted products finally transformed to be root-like in structure on the plate around the unmelted core. Raman spectroscopy was used to determine the product types during the reduction process. Experiments studying the effects of gas flowrate and particle size on the reduction degree were carried out, and the results showed that both increasing the temperature and gas flowrate can increase the reduction degree. The internal/external diffusion influence can be ignored with a particle size smaller than 100 mu m and a gas flowrate more than 200 mL/min. However, owing to the resistance of the melted products to gas diffusion, the reduction rates at 1400 and 1500 degrees C were reduced significantly when the reduction degree increased from 0.5 to 1.0. Conversely, the formation of the liquid enlarged the contact area of the reducing gas and solid-liquid and further increased the reduction degree. The kinetics parameters, including average activation energy and pre-exponential factor, were calculated from the experimental data. The reduction kinetics equation of the single magnetite particle, considering the effect of melted products is also given in this study.
WOS关键词IRON-ORE PELLETS ; HYDROGEN REDUCTION ; HEMATITE FE2O3 ; CONCENTRATE ; BEHAVIOR ; OXIDE ; CO
资助项目National Natural Science Foundation of China[21908063] ; Open Research Fund of State Key Laboratory of Multiphase Complex Systems[MPCS-2021-D-07]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000689427500001
出版者MDPI
资助机构National Natural Science Foundation of China ; Open Research Fund of State Key Laboratory of Multiphase Complex Systems
源URL[http://ir.ipe.ac.cn/handle/122111/50110]  
专题中国科学院过程工程研究所
通讯作者Liu, Haifeng
作者单位1.East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Shen, Zhongjie,Sun, Shuang,Zhu, Yulong,et al. A Kinetic Study on the Reduction of Single Magnetite Particle with Melting Products at High Temperature Based on Visual and Surface Analytical Techniques[J]. METALS,2021,11(8):15.
APA Shen, Zhongjie,Sun, Shuang,Zhu, Yulong,Han, Dong,Du, Zhan,&Liu, Haifeng.(2021).A Kinetic Study on the Reduction of Single Magnetite Particle with Melting Products at High Temperature Based on Visual and Surface Analytical Techniques.METALS,11(8),15.
MLA Shen, Zhongjie,et al."A Kinetic Study on the Reduction of Single Magnetite Particle with Melting Products at High Temperature Based on Visual and Surface Analytical Techniques".METALS 11.8(2021):15.

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来源：过程工程研究所

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