Preparation of CaO-containing carbon pellets from coking coal and calcium oxide: Effects of temperature, pore distribution and carbon structure on compressive strength in pyrolysis furnace

Xiao-min You; Xue-feng She; Jing-song Wang; Qing-guo Xue; Ze-yi Jiang

doi:10.1007/s12613-021-2255-9

Volume 28 Issue 7

Jul. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(7): 1153-1163

Xiao-min You, Xue-feng She, Jing-song Wang, Qing-guo Xue, and Ze-yi Jiang, Preparation of CaO-containing carbon pellets from coking coal and calcium oxide: Effects of temperature, pore distribution and carbon structure on compressive strength in pyrolysis furnace, Int. J. Miner. Metall. Mater., 28(2021), No. 7, pp. 1153-1163. https://doi.org/10.1007/s12613-021-2255-9

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Xiao-min You, Xue-feng She, Jing-song Wang, Qing-guo Xue, and Ze-yi Jiang, Preparation of CaO-containing carbon pellets from coking coal and calcium oxide: Effects of temperature, pore distribution and carbon structure on compressive strength in pyrolysis furnace, Int. J. Miner. Metall. Mater., 28(2021), No. 7, pp. 1153-1163. https://doi.org/10.1007/s12613-021-2255-9

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Research Article

Preparation of CaO-containing carbon pellets from coking coal and calcium oxide: Effects of temperature, pore distribution and carbon structure on compressive strength in pyrolysis furnace

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Corresponding author:
Xue-feng She E-mail: shexuefeng@ustb.edu.cn
Received: 30 October 2020; Revised: 17 January 2021; Accepted: 20 January 2021; Available online: 22 January 2021

Abstract

Abstract

CaO-containing carbon pellets (CCCP) were successfully prepared from well-mixed coking coal (CC) and calcium oxide (CaO) and roasted at different pyrolysis temperatures. The effects of temperature, pore distribution, and carbon structure on the compressive strength of CCCP was investigated in a pyrolysis furnace (350–750°C). The results showed that as the roasting temperature increased, the compressive strength also increased and furthermore, structural defects and imperfections in the carbon crystallites were gradually eliminated to form more organized char structures, thus forming high-ordered CC. Notably, the CCCP preheated at 750°C exhibited the highest compressive strength. A positive relationship between the compressive strength and pore-size homogeneity was established. A linear relationship between the compressive strength of the CCCP and the average stack height of CC was observed. Additionally, a four-stage caking mechanism was developed.
- calcium oxide-containing carbon pellets;
- calcium carbide;
- coking coal;
- compressive strength;
- pyrolysis furnace

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