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Improving properties of fluxed iron ore pellets with high-silica by regulating liquid phase

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Abstract

With rapid development of the pellet production under the background of green development, high-quality iron concentrates were gradually exhausted; thus, using high-silica iron concentrates was expected to be a promising way to relieve resource pressure for pellet production. However, increasing the proportion of high-silica acid pellets into the furnace led to worse blast furnace slag, and the metallurgical properties of high-silica pellets were imperfect. To understand the reciprocal effects of basicity (CaO/SiO2) and MgO content on the properties of the high-silica pellets, the phase compositions and microstructure were investigated using X-ray diffraction and scanning electron microscope, equipped with energy dispersive X-ray spectrometry. The results indicated that simply increasing MgO content from 0 to 2.50 wt.% could decrease the reduction swelling index, but the compressive strength rapidly declined due to the formation of magnesioferrite. However, adding CaO to 2.50 wt.% MgO pellets greatly improved the pellet qualities, which could be attributed to a substantial increase in the amount of high-melting-point silicate liquid phase.

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Acknowledgements

The authors would like to express their heartful thanks to the National Natural Science Foundation of China (Nos. U1960114 and 51574283) and the Fundamental Research Funds for the Central Universities of Central South University (2021XQLH029).

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Authors and Affiliations

  1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, Hunan, China

    Yuan-bo Zhang, Xi-jun Chen, Zi-jian Su, Shuo Liu & Tao Jiang

  2. Yangzhou Pacific Special Materials Co., Ltd., Yangzhou, 225211, Jiangsu, China

    Fang Chen & Nan-yong Wu

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  1. Yuan-bo Zhang
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  2. Xi-jun Chen
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  3. Zi-jian Su
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  4. Shuo Liu
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  5. Fang Chen
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Correspondence to Zi-jian Su.

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Zhang, Yb., Chen, Xj., Su, Zj. et al. Improving properties of fluxed iron ore pellets with high-silica by regulating liquid phase. J. Iron Steel Res. Int. 29, 1381–1392 (2022). https://doi.org/10.1007/s42243-021-00665-4

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  • DOI: https://doi.org/10.1007/s42243-021-00665-4

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