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Study on the structure and reactivity of COREX coal

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Abstract

COREX is the primary process in the current smelting reduction method. The process has strict coal quality standards. Combustion processes of coal used in the COREX operating system were analyzed using a synchronous thermogravimetric analyzer combined with a mass spectrometer. The microcosmic structure and macerals were observed by an electronic scanning microscope. The qualitative and quantitative determinations of oxygen functional groups, such as phenolic hydroxyl, carboxyl, carbonyl, and methoxy groups were detected by the Fourier Transform Infrared spectrometer (FT-IR) and through chemical analysis methods. In addition, the evolution of the chemical structure and transformation mechanism of organic oxygen functional groups during COREX coal combustion have been thoroughly investigated. This study proposes a new coal-requirement index system and coal blending method, which will increase the expansion of coal selection and decrease the overall usage of coal during COREX.

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Abbreviations

T 0 :

Starting temperature of combustion (°C)

T s :

Coal ignition temperature (°C)

T f :

Maximum mass loss velocity temperature (°C)

T e :

Weightlessness ending temperature (°C)

T 1 :

Ending temperature of combustion (°C)

Δm :

Mass loss fraction

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Acknowledgements

We thank the National Natural Science Foundation of China (Grant No. 50934007) for financial support.

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Authors and Affiliations

  1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Xin Cui, Xinxin Zhang, Yanhui Feng & Wenbo Luo

  2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Mu Yang & Hongyi Gao

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  1. Xin Cui
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  2. Xinxin Zhang
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  4. Yanhui Feng
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Correspondence to Xinxin Zhang.

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Cui, X., Zhang, X., Yang, M. et al. Study on the structure and reactivity of COREX coal. J Therm Anal Calorim 113, 693–701 (2013). https://doi.org/10.1007/s10973-012-2782-8

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