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Effect of Alkali Metal on Gas-Solid Reduction of Iron Oxide |
PAN Wen1,2,WU Keng1,ZHAO Yong1,2,ZHAO Zhi-xing2,MIN Dong Joon3 |
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing,Beijing 100083, China 2. Department of Iron and Steelmaking Technology, Shougang Research Institute of Technology, Beijing 100043, China 3. Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea |
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Abstract Fe2O3 and Fe2O3 doped with Na2O from 1.0 to 5.0 mass percent compacts were isothermally reduced at various temperatures from 1073 to 1273K with CO/CO2 mixed gas in a vertical resistance furnace. To determine the effect of Na2O on the reduction of Fe2O3 compacts, mass loss due to oxygen removal was continuously recorded from which the reduction rate and rate constant was obtained. The morphology change was also observed by SEM. The results show that Na2O retards the reduction of Fe2O3 compacts. Morphological examination of reduced compacts and the binary phase diagram of FeO-Na2O show liquid phase formation during the reduction, which decreases the rate of reduction. Porosity and volumetric expansion of reduced compacts were investigated, which shows that the volume and porosity of reduced Fe2O3-Na2O compacts are both decreased with higher Na2O content due to the existence of liquid phase.
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Received: 29 November 2012
Published: 18 June 2013
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