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Phase transformation and reduction kinetics during the hydrogen reduction of ilmenite concentrate

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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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Authors and Affiliations

  1. Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai, 200072, China

    Xin-guo Si, Xiong-gang Lu, Chuan-wei Li, Chong-he Li & Wei-zhong Ding

  2. Hebei Iron and Steel Group Tangshan Steel Company, Tangshan, 063020, China

    Xin-guo Si

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  1. Xin-guo Si
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  2. Xiong-gang Lu
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  3. Chuan-wei Li
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  4. Chong-he Li
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  5. Wei-zhong Ding
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Correspondence to Xiong-gang Lu.

Additional information

This work was financially supported by the Postgraduate Innovative Foundation of Shanghai University (SHUCX091031), the National Natural Science Foundation of China (No.51074105), and the National Basic Research Priorities Program of China (No.2007CB613606).

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Si, Xg., Lu, Xg., Li, Cw. et al. Phase transformation and reduction kinetics during the hydrogen reduction of ilmenite concentrate. Int J Miner Metall Mater 19, 384–390 (2012). https://doi.org/10.1007/s12613-012-0568-4

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  • DOI: https://doi.org/10.1007/s12613-012-0568-4

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