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Investigation on the sintering behaviors of low-temperature lignite ashes

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Abstract

To investigate the sintering behaviors of lignite ashes, the 450 °C Xiaolongtan (XLT) and Huolinhe (HLH) lignite ash samples were analyzed by press-drop sintering technique, scanning electron microscope, and X-ray diffraction. The result shows the sintering temperature of XLT ash is lower than that of HLH, as a result of that base/acid (B/A) ratio of XLT is higher than that of HLH. The sintering temperatures of two lignite ashes under reducing atmospheres (H2 and CO) are lower than those under oxidizing atmospheres (CO2 and O2), which result from the effects of different iron states under different atmospheres. The sintering temperatures of two lignite ashes decrease with the increase in pressure. It decreases slightly in the range of low pressure, changes clearly in the range of 0.7–1.0 MPa, and changes slightly again with further increase in pressure. The sintering process of lignite ashes is proposed by the presentation of partial-melting phases, the generations of aggregates, and the densification of aggregates.

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Acknowledgements

This work was financially supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Contract No. XDA07050103), the Foundation of State Key Laboratory of Coal Conversion (Contract No. J12-13-102), and the Knowledge Innovation Programs of the Chinese Academy of Science (Contract No. KGCX2-YW-397). We are thankful to all the workers in the coal gasification pilot scale center, ICC, CAS.

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Authors and Affiliations

  1. Department of Chemistry and Engineering, Heze University, Heze, 274000, People’s Republic of China

    Fenghai Li & Tao Wang

  2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, People’s Republic of China

    Shaohua Ji, Fenghai Li, Huibin Fang, Jiejie Huang & Ytian Fang

  3. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, People’s Republic of China

    Fenghai Li & Zhenzhu Li

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  1. Shaohua Ji
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  2. Fenghai Li
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  4. Zhenzhu Li
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Correspondence to Fenghai Li.

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Ji, S., Li, F., Wang, T. et al. Investigation on the sintering behaviors of low-temperature lignite ashes. J Therm Anal Calorim 117, 1311–1320 (2014). https://doi.org/10.1007/s10973-014-3941-x

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  • DOI: https://doi.org/10.1007/s10973-014-3941-x

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