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Volume 26 Issue 10
Oct.  2019
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文章导航 >  矿物冶金与材料学报（英文）  > 2019  >  26(10): 1231-1238
Jian-wen Yu, Yue-xin Han, Yan-jun Li,  and Peng Gao, Growth behavior of the magnetite phase in the reduction of hematite via a fluidized bed, Int. J. Miner. Metall. Mater., 26(2019), No. 10, pp. 1231-1238. https://doi.org/10.1007/s12613-019-1868-8
Cite this article as:
Jian-wen Yu, Yue-xin Han, Yan-jun Li,  and Peng Gao, Growth behavior of the magnetite phase in the reduction of hematite via a fluidized bed, Int. J. Miner. Metall. Mater., 26(2019), No. 10, pp. 1231-1238. https://doi.org/10.1007/s12613-019-1868-8
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研究论文

Growth behavior of the magnetite phase in the reduction of hematite via a fluidized bed

  • School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China

  • State Key Laboratory of Mineral Processing, Beijing General Research Institute of Mining & Metallurgy Group, Beijing 102628, China

  • 通讯作者:

    Yan-jun Li    E-mail: liyanjun@mail.neu.edu.cn

    Peng Gao    E-mail: gaopeng@mail.neu.edu.cn

  • To understand the formation and growth mechanism of the magnetite phase during the fluidized reduction of hematite, a high-purity hematite ore was isothermally reduced using a 20vol% CO-80vol% CO2 gas mixture in a micro-fluidized bed to examine the process of the selective conversion of hematite to magnetite. The micro-structural characteristics of the magnetite phase were investigated using scanning electron microscopy (SEM) and the Brunauer, Emmett, and Teller (BET) method, and the thickness of the magnetite layer was measured and evaluated using statistical analysis. The experimental results showed that the fresh magnetite nuclei were dense needles of different lengths, and the original hematite grains became porous after complete reduction to the magnetite phase. The thickness of the magnetite layer increased with an increase in reduction temperature and reduction time. The growth kinetics of the magnetite layer was investigated, and the value of the activation energy E was estimated to be 28.33 kJ/mol.
    • Research Article

    Growth behavior of the magnetite phase in the reduction of hematite via a fluidized bed

    + Author Affiliations
      Abstract
    • To understand the formation and growth mechanism of the magnetite phase during the fluidized reduction of hematite, a high-purity hematite ore was isothermally reduced using a 20vol% CO-80vol% CO2 gas mixture in a micro-fluidized bed to examine the process of the selective conversion of hematite to magnetite. The micro-structural characteristics of the magnetite phase were investigated using scanning electron microscopy (SEM) and the Brunauer, Emmett, and Teller (BET) method, and the thickness of the magnetite layer was measured and evaluated using statistical analysis. The experimental results showed that the fresh magnetite nuclei were dense needles of different lengths, and the original hematite grains became porous after complete reduction to the magnetite phase. The thickness of the magnetite layer increased with an increase in reduction temperature and reduction time. The growth kinetics of the magnetite layer was investigated, and the value of the activation energy E was estimated to be 28.33 kJ/mol.
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