Journal
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
Volume 26, Issue 10, Pages 1231-1238Publisher
SPRINGER
DOI: 10.1007/s12613-019-1868-8
Keywords
hematite ore; fluidized bed; suspension magnetization roasting; magnetite; growth kinetics
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Funding
- National Science Foundation of China [51734005, 51674065]
- China Postdoctoral Science Foundation [2018M631812]
- Open Foundation of State Key Laboratory of Mineral Processing, Beijing General Research Institute of Mining & Metallurgy Group, China [BGRIMM-KJSKL-2019-09]
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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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