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Microstructure and Phase Transformation of a Sinter Bearing Low Ti During Reduction

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Abstract

To discuss the reduction behaviors and the transformation mechanism of the Fe containing phases and slag phases of low Ti-bearing sinter (LTS), reduction experiments of the LTS were conducted. The reduction of the LTS was divided into four stages based on the reduction rate, deformation quantity of LTS particle column, phase changes, and microstructural changes. The reduction process could be explained with quasi unreacted core model as three stratifications with different phases and microstructures were observed clearly in the medium-temperature reducing stage. For the reduction of Ti-SFCA, a middle phase of the reduction was found and the phase was surrounded by metallic iron. According to the composites of the reduced Ti-SFCA, the middle phase was a solid solution and difficult to be reduced which consisted mainly of brownmillerite–perovskite and monocalcium silicate. The phase transformation and microstructure changes were mutual coupling in the complicated reduction process of the LTS.

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Acknowledgments

The authors are grateful to the key program of the National Natural Science Foundation of China (Project No.2012CB720401) and the basic programs of National Natural Science Foundation of China (Project No.51174023 and No.51504216).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, 30th Xueyuan Road, Haidian district, Beijing, 100083, P.R. China

    Jianliang Zhang (Professor), Yapeng Zhang (Ph.D. Candidates), Kejiang Li (Ph.D. Candidates), Yaozu Wang (Ph.D. Candidates), Zhengjian Liu (Lecturer) & Guangwei Wang (Lecturer)

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  1. Jianliang Zhang
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  2. Yapeng Zhang
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  3. Kejiang Li
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  4. Yaozu Wang
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  5. Zhengjian Liu
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  6. Guangwei Wang
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Correspondence to Yapeng Zhang.

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Manuscript submitted November 22, 2015.

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Zhang, J., Zhang, Y., Li, K. et al. Microstructure and Phase Transformation of a Sinter Bearing Low Ti During Reduction. Metall Mater Trans B 47, 3046–3055 (2016). https://doi.org/10.1007/s11663-016-0753-3

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  • DOI: https://doi.org/10.1007/s11663-016-0753-3

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