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Investigation on the Microstructure, Thermal Strength and Gasification Mechanism of Modified Ferro-Coke with Coal Tar Pitch

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Abstract

Ferro-coke is prepared by the slight coking of coal and iron ore. It is a new type of fuel used for blast furnace ironmaking for the purpose of energy saving and emission reduction. However, with the increase of iron ore content, the metallurgical properties of ferro-coke gradually deteriorate. To fabricate high-strength ferro-coke, coal tar pitch was used as a binder in this study. The microstructure, cold drum strength, thermal crushing strength, gasification reactivity and gasification kinetics of this modified ferro-coke were systematically studied and compared with those of gas-coal coke and ferro-coke without binder. The results showed that the coal tar pitch could reduce the porosity of ferro-coke by 4.57 pct, enhance the adhesion of carbon matrix to minerals and increase the microcrystalline structure of ferro-coke. The cold drum strength of ferro-coke increased from 28.04 to 86.34 pct after adding coal tar pitch, while the thermal strength of ferro-coke during the gasification process rose by only 100 N. The coal tar pitch had little effect on the gasification reactivity of ferro-coke, so the activation energy of modified ferro-coke was still low. The first-principle calculation results revealed that the promotion of Fe on the ferro-coke gasification was attributed to the reducing role of Fe on the reaction energy of ketone group decomposition.

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Acknowledgment

The authors acknowledge financial support from the National Natural Science Foundation of China (51704216, U1760101), National Postdoctoral Program for Innovative Talents Funded Project (BX20180023) and China Postdoctoral Science Foundation Funded Project (2019M650424).

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Authors and Affiliations

  1. State Key Laboratory of Refractories and Metallurgy; Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, China

    Runsheng Xu, Xiaoming Huang, Wei Wang, Shuliang Deng & Mingming Song

  2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology, Beijing, Beijing, 100083, China

    Runsheng Xu

  3. Chair of Ferrous Metallurgy, Montanuniversität Leoben, Franz-Josef-Straße 18, 8700, Leoben, Austria

    Heng Zheng

  4. School of Energy and Power Engineering, Beihang University, Beijing, 100191, China

    Fangfang Wang

  5. Ningbo Institute of Technology, Beihang University, Ningbo, 315800, China

    Fangfang Wang

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  1. Runsheng Xu
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  2. Xiaoming Huang
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  3. Wei Wang
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  4. Shuliang Deng
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  5. Heng Zheng
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  7. Fangfang Wang
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Correspondence to Runsheng Xu, Wei Wang or Fangfang Wang.

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Manuscript submitted February 13, 2020.

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Xu, R., Huang, X., Wang, W. et al. Investigation on the Microstructure, Thermal Strength and Gasification Mechanism of Modified Ferro-Coke with Coal Tar Pitch. Metall Mater Trans B 51, 1526–1539 (2020). https://doi.org/10.1007/s11663-020-01867-z

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  • DOI: https://doi.org/10.1007/s11663-020-01867-z

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