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Leaching Property of Coal Fly Ash Using Water as the Solvent and Its Carbonation Performance

석탄 비산재의 물에 대한 침출 특성과 탄산화 성능에 관한 연구

  • Shin, Jiyoon (Department of Environmental Engineering, The Catholic University of Korea) ;
  • Han, Sang-Jun (Department of Environmental Engineering, The Catholic University of Korea) ;
  • Wee, Jung-Ho (Department of Environmental Engineering, The Catholic University of Korea)
  • 신지윤 (가톨릭대학교 환경공학과) ;
  • 한상준 (가톨릭대학교 환경공학과) ;
  • 위정호 (가톨릭대학교 환경공학과)
  • Received : 2012.12.07
  • Accepted : 2014.03.10
  • Published : 2014.03.31

Abstract

The present paper investigates the leaching property of coal fly ash (FA) using distilled water as solvent and its performance of mineral carbonation. The highest leaching efficiency is obtained at 100 min after leaching begins and the overall leaching efficiencies of Ca and Na via five consecutive leachings were calculated to be 25.37% and 7.40%, respectively. In addition, because $Ca(OH)_2$ produced during the leaching reacts with $SiO_2$ which is the major component of FA, the Pozzolanic reaction may occur and thus reduces leaching efficiency. Total carbonation capacity of FA by absorbing $CO_2$ into FA leachates is 6.08 mg $CO_2/g$ FA and the contribution of alkali substances such as Ca, Na, Mg and K to this value is calculated to be 5.19 mg $CO_2/g$ FA. Carbonation efficiencies of Ca and Na based on leachates are 85.62% and 77.70%, respectively. On the other hand, the ratios of Ca and Na in raw FA to participate in carbonation are calculated to be 9.04% and 5.26%, respectively.

Acknowledgement

Supported by : 한국연구재단

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