Qiang Zhang, Yongsheng Sun, Yuexin Han, Yanjun Li, and Peng Gao, Reaction behavior and non-isothermal kinetics of suspension magnetization roasting of limonite and siderite, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 824-833. https://doi.org/10.1007/s12613-022-2523-3
Cite this article as:
Qiang Zhang, Yongsheng Sun, Yuexin Han, Yanjun Li, and Peng Gao, Reaction behavior and non-isothermal kinetics of suspension magnetization roasting of limonite and siderite, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 824-833. https://doi.org/10.1007/s12613-022-2523-3
Research Article

Reaction behavior and non-isothermal kinetics of suspension magnetization roasting of limonite and siderite

+ Author Affiliations
  • Corresponding author:

    Yongsheng Sun    E-mail: yongshengsun@mail.neu.edu.cn

  • Received: 7 March 2022Revised: 11 June 2022Accepted: 6 July 2022Available online: 9 July 2022
  • In order to develop limonite and decrease CO2 emissions, siderite is proposed as a clean reductant for suspension magnetization roasting (SMR) of limonite. An iron concentrate (iron grade: 65.92wt%, iron recovery: 98.54wt%) was obtained by magnetic separation under the optimum SMR conditions: siderite dosage 40wt%, roasting temperature 700°C, roasting time 10 min. According to the magnetic analysis, SMR achieved the conversion of weak magnetic minerals to strong magnetic minerals, thus enabling the recovery of iron via magnetic separation. Based on the phase transformation analysis, during the SMR process, limonite was first dehydrated and converted to hematite, and then siderite decomposed to generate magnetite and CO, where CO reduced the freshly formed hematite to magnetite. The microstructure evolution analysis indicated that the magnetite particles were loose and porous with a destroyed structure, making them easier to be ground. The non-isothermal kinetic results show that the main reaction between limonite and siderite conformed to the two-dimension diffusion mechanism, suggesting that the diffusion of CO controlled the reaction. These results encourage the application of siderite as a reductant in SMR.
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