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Fluidized magnetization roasting of refractory siderite-containing iron ore via preoxidation–low-temperature reduction

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Abstract

Magnetization roasting is one of the most effective way of utilizing low-grade refractory iron ore. However, the reduction roasting of siderite (FeCO3) generates weakly magnetic wüstite, thus reducing iron recovery via weak magnetic separation. We systematically studied and proposed the fluidized preoxidation-low-temperature reduction magnetization roasting process for siderite. We found that the maghemite generated during the air oxidation roasting of siderite would be further reduced into wüstite at 500 and 550°C due to the unstable intermediate product magnetite (Fe3O4). Stable magnetite can be obtained through maghemite reduction only at low temperature. The optimal fluidized magnetization roasting parameters included preoxidation at 610°C for 2.5 min, followed by reduction at 450°C for 5 min. For roasted ore, weak magnetic separation yielded an iron ore concentrate grade of 62.0wt% and an iron recovery rate of 88.36%. Compared with that of conventional direct reduction magnetization roasting, the iron recovery rate of weak magnetic separation had greatly improved by 34.33%. The proposed fluidized preoxidation-low-temperature reduction magnetization roasting process can realize the efficient magnetization roasting utilization of low-grade refractory siderite-containing iron ore without wüstite generation and is unlimited by the proportion of siderite and hematite in iron ore.

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Acknowledgements

The authors are grateful for the financial support from the National Natural Science Foundation of China (Nos. 51974287 and 21736010) and Innovation Academy for Green Manufacture, Chinese Academy of Sciences (No. IAGM-2019-A11).

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Authors and Affiliations

  1. Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Bei**g, 100190, China

    Haoyan Sun

  2. Institute of Process Engineering, Chinese Academy of Sciences, State Key Laboratory of Multiphase Complex Systems, Bei**g, 100190, China

    Haoyan Sun, Zheng Zou, Meiju Zhang & Dong Yan

  3. School of Chemical Engineering, University of Chinese Academy of Sciences, Bei**g, 100049, China

    Haoyan Sun

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  1. Haoyan Sun
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Correspondence to Haoyan Sun.

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Sun, H., Zou, Z., Zhang, M. et al. Fluidized magnetization roasting of refractory siderite-containing iron ore via preoxidation–low-temperature reduction. Int J Miner Metall Mater 30, 1057–1066 (2023). https://doi.org/10.1007/s12613-022-2576-3

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  • DOI: https://doi.org/10.1007/s12613-022-2576-3

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