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

Jian-wen Yu; Yue-xin Han; Yan-jun Li; Peng Gao

doi:10.1007/s12613-019-1868-8

Volume 26 Issue 10

Oct. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 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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Research Article

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

+ Author Affiliations

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

Peng Gao E-mail: gaopeng@mail.neu.edu.cn
Received: 31 January 2019; Revised: 13 May 2019; Accepted: 3 June 2019

Abstract

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.
- hematite ore;
- fluidized bed;
- suspension magnetization roasting;
- magnetite;
- growth kinetics

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