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Thermal Decomposition Kinetics of Siderite Ore during Magnetization Roasting

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Abstract

The non-isothermal magnetization roasting process and isothermal magnetization roasting process of siderite ore were investigated using thermogravimetric (TG) analysis and a real-time infrared gas analyzer. X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) were used to analyze the characteristics of samples. The results showed that the decomposition degree and decomposition rate of siderite ore were vitally affected by heating rate and roasting temperature. It was determined that A1 reaction model (f(α) = 1 − α) and A3/2 reaction model (f(α) = (3/2)(1 − α)[−ln(1 − α)]1/2) were the most probable mechanism function of the non-isothermal decomposition process and isothermal decomposition process, respectively. The phase transformation and decomposition mechanism during the roasting process were evaluated. Siderite decomposed in the process of magnetization roasting, released CO and CO2, and transformed into strongly magnetic magnetite. The SEM images highlighted that as the decomposition progressed, the structure of roasted samples was destroyed, and an increasing number of cracks and pores emerged on the surface, which is advantageous to the following grinding process.

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Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

The authors acknowledge the financial support provided by the National Natural Science Foundation of China (Nos. 51874071, 51734005), the Fok Ying Tung Education Foundation for Young Teachers in the Higher Education Institutions of China (No. 161045), and Liao Ning Revitalization Talents Program (XLYC1807111).

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Authors and Affiliations

  1. School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, People’s Republic of China

    Qiang Zhang, Yongsheng Sun, Yuexin Han, Peng Gao & Yanjun Li

  2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, People’s Republic of China

    Yongsheng Sun, Yuexin Han & Peng Gao

  3. National-local Joint Engineering Research Center of High-efficient exploitation technology for Refractory Iron Ore Resources, Shenyang, 110819, People’s Republic of China

    Qiang Zhang, Yongsheng Sun, Yuexin Han, Peng Gao & Yanjun Li

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  1. Qiang Zhang
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  2. Yongsheng Sun
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  3. Yuexin Han
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  4. Peng Gao
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  5. Yanjun Li
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Contributions

Qiang Zhang: data curation, formal analysis, validation, writing – original draft. Yongsheng Sun: conceptualization, funding acquisition, resources, writing – review & editing. Yuexin Han: data curation, funding acquisition, project administration, resources. Peng Gao: data curation, resources, supervision. Yanjun Li: Data curation, resources, supervision.

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Correspondence to Yongsheng Sun.

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Zhang, Q., Sun, Y., Han, Y. et al. Thermal Decomposition Kinetics of Siderite Ore during Magnetization Roasting. Mining, Metallurgy & Exploration 38, 1497–1508 (2021). https://doi.org/10.1007/s42461-021-00417-8

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