Reductive kinetics of Panzhihua ilmenite with hydrogen

The hydrogen reduction of Panzhihua ilmenite concentrate in the temperature range of 900–1050 °C was systematically investigated by thermogravimetric analysis (TG), X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods. It was shown that the products of the Panzhihua ilmenite reduce...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2016-12, Vol.26 (12), p.3266-3273
Main Authors: LU, Chang-yuan, ZOU, Xing-li, LU, Xiong-gang, XIE, Xue-liang, ZHENG, Kai, XIAO, Wei, CHENG, Hong-wei, LI, Guang-shi
Format: Article
Language:English
Subjects:
hydrogen reduction
kinetics
magnesium migration
Panzhihua ilmenite
rate-controlling step
synthetic ilmenite
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Summary:The hydrogen reduction of Panzhihua ilmenite concentrate in the temperature range of 900–1050 °C was systematically investigated by thermogravimetric analysis (TG), X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods. It was shown that the products of the Panzhihua ilmenite reduced at 900 °C were metallic iron and rutile. Above 1000 °C, ferrous pseudobrookite solid solution was generated. During the reduction process, element Mg gradually concentrated to form Mg-rich zone which can influence the metallization process. The reduction reaction proceeded topochemically and its related reduction kinetics were also discussed. The kinetics of the reduction indicated that the rate-controlling step was the diffusion process. The apparent activation energy of the hydrogen reduction of Panzhihua ilmenite was calculated to be 117.56 kJ/mol, which was larger than that of synthetic ilmenite under the same reduction condition.
ISSN:1003-6326
DOI:10.1016/S1003-6326(16)64460-6