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

作     者：Xin-guo Si Xiong-gang Lu Chuan-wei Li Chong-he Li Wei-zhong Ding 

作者机构：Shanghai Key Laboratory of Modern Metallurgy and Materials Processing Shanghai University Shanghai 200072 China Hebei Iron and Steel Group Tangshan Steel Company Tangshan 063020 China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2012年第19卷第5期

页      面：384-390页

核心收录：

学科分类：080603[工学-有色金属冶金] 08[工学] 0806[工学-冶金工程] 080601[工学-冶金物理化学] 

基　　金：supported by the Postgraduate Innovative Foundation of Shanghai University (SHUCX091031) the National Natural Science Foundation of China (No.51074105) the National Basic Research Priorities Program of China (No.2007CB613606) 

主　　题：ilmenite phase transformations kinetics hydrogen reduction metallization 

摘      要：The reduction of ilmenite concentrate by hydrogen gas was investigated in the temperature range of 500 to 1200℃. 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℃ for 80 min. The final phase constituents mainly consist of Fe, M305 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 ***1-1.