Phase transformation and reduction kinetics during the hydrogen reduction of ilmenite concentrate |
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Authors: | Xin-guo Si Xiong-gang Lu Chuan-wei Li Chong-he Li Wei-zhong Ding |
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Institution: | 1.Shanghai Key Laboratory of Modern Metallurgy and Materials Processing,Shanghai University,Shanghai,China;2.Hebei Iron and Steel Group Tangshan Steel Company,Tangshan,China |
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Abstract: | The reduction of ilmenite concentrate by hydrogen gas was investigated in the temperature range of 500 to 1200°C. The microstructure
and phase transition of the reduction products were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM),
and optical microscopy (OM). It was found that the weight loss and iron metallization rate increased with the increase of
reduction temperature and reaction time. The iron metallization rate could reach 87.5% when the sample was reduced at 1150°C
for 80 min. The final phase constituents mainly consist of Fe, M3O5 solid solution phase (M=Mg, Ti, and Fe), and few titanium oxide. Microstructure analysis shows that the surfaces of the reduction
products have many holes and cracks and the reactions take place from the exterior of the grain to its interior. The kinetics
of reduction indicates that the rate-controlling step is diffusion process control with the activation energy of 89 kJ·mol−1. |
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