Reduction kinetics of pellets from Wuhan Iron and Steel Corporation
LI Peng,BI Xue- gong,ZHANG Hui- xuan,ZHOU Jin- dong
��Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China��
Abstract��Isothermal reduction experiments of the pellets from Wuhan Iron and Steel Corporation (WISCO) were performed with the thermogravimetry technique in the temperature range from 900�� to 1100�� and under the atmosphere of CO of 100% (volume fraction). The apparent activation energy, reduction rate constant and diffusion coefficient were calculated in terms of the Arrhenius plots and the unreacted core model, respectively, and the rate controlling steps were ascertained accordingly. The microstructure and forms of iron oxides of the pellets at the different reduction stages were observed by FESEM and EDS techniques and the reduction reaction mechanism of the pellets was analyzed accordingly. The results show that the controlling step of the reduction reaction of the pellets is the interfacial chemical reaction during most of the time from the initial stage through the middle and later stage, and it shifts to the solid diffusion at the final stage, and that the pellets reduction proceed in the order from higher oxides to lower oxides of iron and the application of the unreacted core model to the kinetic analysis is appropriate.
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LI Peng,BI Xue- gong,ZHANG Hui- xuan,ZHOU Jin- dong. Reduction kinetics of pellets from Wuhan Iron and Steel Corporation. Chinese Journal of Iron and Steel, 2015, 27(11): 8-13.
2015, Vol. 27 
