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Influence of Iron Ore Addition on Metallurgical Reaction Behavior of Iron Coke Hot Briquette

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Abstract

Utilization of iron coke hot briquette (ICHB) has been considered to be one effective countermeasure to achieve low-carbon blast furnace. Before its actual application, a series of extensive fundamental investigations on the ICHB are required. In this study, the influence of iron ore addition on the metallurgical reaction behavior of ICHB made from carbonizing coal–iron ore composite agglomeration were investigated based on Chinese raw material conditions, and the corresponding mechanisms were revealed. The results show that the addition of iron ore concentrate leads to the degradation of the compressive strength and drum strength of ICHB, but they are maintained at a relatively high level. Furthermore, by increasing the addition ratio of iron ore from 0 to 20 pct, the density of ICHB is enhanced from 1413 to 1637 kg/m3, and the porosity is increased from 8.03 to 12.84 pct, and the optical texture index (OTI) is reduced from 58.1 to 25.3. The phase composition of ICHB mainly consists of C, Fe, SiO2, Fe3O4, and FeO after the addition of the iron ore concentrate. Moreover, the reactivity of ICHB is accelerated from 46.74 to 69.54 pct due to the catalytic effects of metallic iron and iron oxide, which worked as oxygen transfer carriers, while the post-reaction strength is reduced from 74.08 to 36.81 pct. In addition, the starting temperature of the ICHB gasification reaction is decreased remarkably from 919 °C to 839 °C. The activation energy (Ea) for the gasification reaction under nonisothermal conditions is reduced from 312.78 to 249.83 kJ/mol, and the preexponential factor (A) shows a decreasing trend as well. Simultaneously, Ea and A display the kinetic compensation effect and present a good linear relationship.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (U1808212), the China Postdoctoral Science Foundation (2016M601321), and the Fundamental Research Funds of the Central Universities of China (N162503003).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, People’s Republic of China

    Hongtao Wang, Mansheng Chu, Wei Zhao, Zhenggen Liu & Jue Tang

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  1. Hongtao Wang
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  2. Mansheng Chu
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  3. Wei Zhao
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Correspondence to Mansheng Chu or Zhenggen Liu.

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Manuscript submitted December 28, 2017.

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Wang, H., Chu, M., Zhao, W. et al. Influence of Iron Ore Addition on Metallurgical Reaction Behavior of Iron Coke Hot Briquette. Metall Mater Trans B 50, 324–336 (2019). https://doi.org/10.1007/s11663-018-1481-7

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