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J. Korean Ceram. Soc. > Volume 57(4); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(4): 447-457.
doi: https://doi.org/10.1007/s43207-020-00032-1
Preparation of porous cordierite ceramic with acid‑leached coal gangue
Xu‑Dong Wang1, Hai‑Yan Xu1,2 , Feng‑Jun Zhang1,2, Dong‑Cai Li1, Ai‑Guo Wang1, Dao‑Sheng Sun1, Won‑Chun Oh3
1Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, Anhui, People’s Republic of China
2Key Laboratory of Functional Molecule Design and Interface Process, Anhui Jianzhu University, Hefei 230601, Anhui, People’s Republic of China
3Department of Advanced Materials Science & Engineering, Hanseo University, Seosan 31962, Korea
Correspondence  Hai‑Yan Xu ,Email: xuhaiyan@ahjzu.edu.cn
Won‑Chun Oh ,Email: wc_oh@hanseo.ac.kr
Received: December 26, 2019; Revised: February 10, 2020   Accepted: February 13, 2020.  Published online: April 30, 2020.
ABSTRACT
The effect of impurities in coal gangue on the sintering and properties (porosity and compressive strength) of porous cordierite ceramics has been investigated by adjusting the amount of impurities by controlling the acid–gangue ratio during acid leaching. The sintering behavior and microstructure of the porous ceramics have been characterized via X-ray diffractometry and scanning electron microscopy. The effects of both the acid–gangue ratio and sintering temperature on the porosity and compressive strength have been also investigated. The results indicated that both porosity and compressive strength of the porous cordierite ceramics prepared using acid-leached coal gangue were evidently improved. The content of the impurities in coal gangue was adjusted via acid leaching by controlling the acid–gangue ratio. The appropriate content of impurities in coal gangue facilitated the sintering process and improved the porosity and compressive strength of the obtained porous cordierite ceramics.
Key words: Acid leaching · Porous ceramic · Coal gangue · Cordierite
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