【摘 要】
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The reduction of ilmenitc concentrate by hydrogen gas was investigated m the temperature range of 500 to 1200℃.The micro-structure and phase transition of the
【机 构】
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Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Hebei Iron and Steel Group Ta
【基金项目】
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This work was financially supported by the Postgraduate Innovative Foundation of Shanghai University;国家自然科学基金;the National Basic Research Priorities Program of China
论文部分内容阅读
The reduction of ilmenitc concentrate by hydrogen gas was investigated m the temperature range of 500 to 1200℃.The micro-structure 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 metalfization 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℃ for 80 min.The final phase constituents mainly consist of Fe,M3O5 solid solution phase (M=Mg,Ti,and Fc),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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