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Super-high bed sintering for iron ores: inhomogeneous phenomena and its mechanism during mineralizing

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Abstract

The inhomogeneous sinter properties in super-high bed sintering have been reported in our previous research. To investigate the reasons for the inhomogeneous phenomena, detailed sampling and analysis of mixed material bed and sintered bed in super-high bed sintering plant were executed. The results indicated that the higher porosity and thinner dendrite of silico-ferrite of calcium and aluminum in the upper layer as well as dense structure and higher secondary hematite content in the lower layer led to the heterogeneities of mechanical strength and reduction properties exceeding 20% and 10%, respectively. From the bed top downward, the basicity of mixed material decreased from 2.13 to 1.68 because the average particle size increased from 2.65 to 4.56 mm. Fluxes and fuels gathered in finer particles (− 3 mm) of mixed material, and the − 3 mm particles of mixed material generated more liquid phase than + 3 mm ones. The heat input of super-high sintering bed was inhomogeneous due to the heat accumulation effect and unreasonable fuel distribution. The inhomogeneous sintering heat condition in sintering bed resulted in the different quantities and properties of liquid phase. The inhomogeneous quantities and properties of liquid phase that were influenced by inhomogeneous distribution of chemical composition, particle size, and heat input led to inhomogeneous mineralizing results. Homogeneous mineralizing condition is the key for homogeneous super-high bed sintering.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 52274290).

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Authors and Affiliations

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

    Hui-bo Liu, Liang-ping Xu, Xi-duan Yang, Zhong-lin Dong, Qiang Zhong & Guang-hui Li

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  1. Hui-bo Liu
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  2. Liang-ping Xu
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  3. Xi-duan Yang
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  4. Zhong-lin Dong
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  5. Qiang Zhong
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  6. Guang-hui Li
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Correspondence to Guang-hui Li.

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Liu, Hb., Xu, Lp., Yang, Xd. et al. Super-high bed sintering for iron ores: inhomogeneous phenomena and its mechanism during mineralizing. J. Iron Steel Res. Int. (2023). https://doi.org/10.1007/s42243-023-01117-x

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