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Investigations on Compressive Strength and Microstructure of High-Basicity Iron Ore Pellets

  • Microstructural Evolution in Powder Processing
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Abstract

To replace part of sinter with pellets to achieve energy saving and emission reduction, high-basicity pellets are investigated. In this study, the effect of basicity and roasting temperature on the compressive strength and microstructure during the induration is examined. Green pellets (basicity: 1.5–3.5) are made by laboratory-scale balling disc and roasted in a tube furnace. Thermogravimetric analysis (TG) is used to analyze the thermal decomposition of mixed raw materials with different basicity. The x-ray diffraction (XRD), scanning electron microscope and energy-dispersive spectroscopy (SEM–EDS) are used to systematically analyze the phase composition, microstructure and elemental distribution of pellets with different basicity. The findings show that as the basicity increases, weightlessness of green pellets becomes intense, and the porosity increases at 1190°C. At other roasting temperatures, the porosity first increases and then decrease. The law of compressive strength is opposite to that of porosity. When the temperature is raised, the generation of molten phase is promoted and fills the pores, which reduces porosity. With the increase of basicity, CaO reacts with Fe2O3 to form CaFe2O4 and Ca2Fe2O5. Depending on the experimental results, a schematic of the oxidation mechanism is presented, providing the theoretical foundations for the study of high-basicity pellets.

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Acknowledgements

The present work was financially supported by the National Nature Science Foundation of China [grant no. 2019M663932XB (52174325)] and the Natural Science Basic Research Program of Shaanxi (program no. 2019JLP-05).

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Authors and Affiliations

  1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, People’s Republic of China

    Jian-Tao Ju, Qi-Di Li, Xiang-Dong Xing & Jian Zu

  2. Research Center of Metallurgical Engineering and Technology of Shaanxi, Xi’an University of Architecture and Technology, Xi’an, 710055, People’s Republic of China

    Jian-Tao Ju & Xiang-Dong Xing

  3. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, People’s Republic of China

    Ke Ma

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  1. Jian-Tao Ju
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Correspondence to Xiang-Dong Xing.

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Ju, JT., Li, QD., Xing, XD. et al. Investigations on Compressive Strength and Microstructure of High-Basicity Iron Ore Pellets. JOM 75, 2525–2534 (2023). https://doi.org/10.1007/s11837-023-05747-0

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  • DOI: https://doi.org/10.1007/s11837-023-05747-0

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