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Comparison of reduction disintegration characteristics of TiO2-rich burdens prepared with sintering process and composite agglomeration process

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Abstract

To reveal the impact of the composite agglomeration process (CAP) on the reduction disintegration properties of TiO2-rich ironmaking burden for a blast furnace, the reduction disintegration indices (RDIs), mineral constituents, and microstructure of the products prepared by the CAP and the traditional sintering process (TSP) were investigated. The results showed that, compared to the sinter with a basicity of 2.0 prepared by the TSP, the RDI+6.3 and the RDI+3.15 of the CAP product with the same basicity increased by 28.2wt% and 13.7wt%, respectively, whereas the RDI−0.5 decreased by 2.7wt%. The analysis of the mineral constituents and microstructure of the products indicated that the decreasing titanohematite content decreased the volume expansion during reduction. Meanwhile, the decreasing perovskite content decreased its detrimental effect on the reduction disintegration properties. In addition, the higher silicoferrite of calcium and aluminum (SFCA) content improved the strength of the CAP product. Together, these factors result in an improvement of the RDI of the CAP products. In addition, compared to the sinter, the reduced CAP products clearly contained fewer cracks, which also led to mitigation of reduction disintegration.

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Authors and Affiliations

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

    Zheng-wei Yu, Guang-hui Li, Chen Liu, Feng Zhou, Zhi-wei Peng & Tao Jiang

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  1. Zheng-wei Yu
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  2. Guang-hui Li
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  3. Chen Liu
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  4. Feng Zhou
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  5. Zhi-wei Peng
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  6. Tao Jiang
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Correspondence to Guang-hui Li.

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Yu, Zw., Li, Gh., Liu, C. et al. Comparison of reduction disintegration characteristics of TiO2-rich burdens prepared with sintering process and composite agglomeration process. Int J Miner Metall Mater 23, 389–398 (2016). https://doi.org/10.1007/s12613-016-1248-6

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  • DOI: https://doi.org/10.1007/s12613-016-1248-6

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