Hydrothermal Reactivity of Various Classified Fly Ashes by Electrostatic Precipitator

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J. Korean Ceram. Soc. > Volume 37(8); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(8): 811.

전기집진장치로부터 단별채취한 플라이 애쉬의 수열반응성

이승헌, Estuo Sakai¹, Masaki Daimon¹

군산대학교 재료, 화학공학부
¹동경공업대학대학원 이공학연구과

Hydrothermal Reactivity of Various Classified Fly Ashes by Electrostatic Precipitator

ABSTRACT

This paper discussed hydrothermal reactivity of Ca(OH)2 and classified bituminous fly ashes which were collected at an electrostatic precipitator in coal fired power plant at 181$^{circ}C$. The major products of hydrothermal reaction were tobermorite and hydrogrossularite because bituminous fly ashes contained Al2O3 content greater than 20 wt%. As increasing amount of Al2O3 content greater than 20 wt%. As increasing amount of Al2O3 in glass phases, formation of hydrogrossularite increased. Formation rate of crystalline tobermorite increased with content of finer particles, higher glass content and more Al2O3 in glass phases. There was a positive correlation between residue on 45${mu}{textrm}{m}$ sieve and hydrothermal reactivity of fly ash up to 3 hours. The hydrothermal reactivity of fly ash at 181$^{circ}C$ for 12 hours was more affected by fineness than by glass content of fly ash.

Key words: Fly ash, Hydrothermal reactivity, Tobermorite, Hydrogrossularite