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| Isothermal reduction kinetics of high-phosphorus iron ore carbon-containing pellets |
| CHEN Wen1, WANG Xin2, LEI Ying2, LI Yu2, HE Si-qi3, LIAO Zhen-hong1 |
1. Department of Mineral Resources Development and Utilization Technology, Changsha Research Institute of Mining and Metallurgy Co. , Ltd. , Changsha 410012, Hunan, China;
2. School of Metallurgical Engineering,Anhui University of Technology, Ma′anshan 243032, Anhui, China;
3. Steel Structure Engineering Company, China Construction Eighth Engineering Division Steel Structure Engineering Co. , Ltd. , Shanghai 200135, China |
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Abstract To study the isothermal reduction kinetics of high-phosphorus iron ore carbon-containing pellets, at the temperature of 1 173, 1 273, 1 323, 1 373, 1 423 and 1 473 K. Several solid-state reaction mechanism functions, i.e. interfacial chemical reaction model, Jander equation, Ginstling-Broushtein equation, and G Valensi-R E Carter equation were used to fitting the reduction reaction process. The phase, microstructure and elementary composition were characterized by using X-ray diffraction (XRD), Scanning electron microscope (SEM) and Energy Dispersive X-Ray Microanalysis (EDX) techniques. With the increase of the reduction degree, the reaction rate increased from zero to the maximum rapidly, and then gradually decreased and became flat. The reaction rates increase with increased temperature. At the temperature form 1 173 to 1 373 K, the reduction reactions are well fit to the interface chemical reaction model, the apparent activation energy and correlation coefficients are 70.02 kJ/mol and 0.948 1 respectively; At the temperature form 1 373 to 1 473 K, the reduction reactions are well fit to the Jander model, the restrictive step is iron ion solid-state diffusion, the apparent activation energy, and correlation coefficients are 215.36 kJ/mol and 0.991 2 respectively.
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Received: 27 November 2019
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2020, Vol. 55 
