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

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 pyro...

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Bibliographic Details
Published in矿物冶金与材料学报 Vol. 28; no. 7; pp. 1153 - 1163
Main Authors Xiao-min You, Xue-feng She, Jing-song Wang, Qing-guo Xue, Ze-yi Jiang
Format Journal Article
LanguageEnglish
Published State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China%School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China 2021
Subjects
compressive strength
coking coal
calcium oxide-containing carbon pellets
pyrolysis furnace
calcium carbide
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Summary: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℃). 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℃ exhibited the highest compressive strength. A positive relationship between the compressive strength and pore-size homogeneity was established. A linear relationship between the com-pressive strength of the CCCP and the average stack height of CC was observed. Additionally, a four-stage caking mechanism was developed.
ISSN:1674-4799