Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Carbonization of Coal-Fly Ash Containing High CaO Compound

CaO 화합물이 다량 함유된 비산재의 탄산화

  • Sim, Jun Soo (Department of Advanced Material Science and Engineering, Kyonggi University) ;
  • Lee, Ki Gang (Department of Advanced Material Science and Engineering, Kyonggi University) ;
  • Kim, Yu Taek (Department of Advanced Material Science and Engineering, Kyonggi University) ;
  • Kang, Seung Ku (Department of Advanced Material Science and Engineering, Kyonggi University)
  • 심준수 (경기대학교 신소재공학과) ;
  • 이기강 (경기대학교 신소재공학과) ;
  • 김유택 (경기대학교 신소재공학과) ;
  • 강승구 (경기대학교 신소재공학과)
  • Received : 2012.10.17
  • Accepted : 2013.01.22
  • Published : 2013.01.31
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Abstract

This study was conducted to recycle fly ash containing an abundance of CaO generated from combustion in a circulating layer as a carbon storage medium. The study utilized XRD, TG-DTA and XRF analyses during the hydration of fly ash and identified calcium substances within fly ash that could be used in a carbonation process. $Ca^{2+}$ ions in the calcium substances were easily converted to hydrates. A carbonation experiment was done, which used the method of $CO_2$ gas injection to produce suspensions by mixing fly ash with distilled water. The results were analyzed using TG-DTA, XRD, and pH meter measurements. The study was able to verify that the reaction was completed at a $CO_2$ flow rate of 300cc/min approximately 30 minutes after an injection into a solution with a solid-liquid ratio of 1 : 10 of fly ash and distilled water. Moreover, the stirring time of the suspensions did not influence the reaction, and the reaction time was found to diminish as the portion of the fly ash became smaller. Thus, this study produced carbon storage fly ash having a $CO_2$ storage rate of about 71% through the utilization of the CaO content contained within fly ash.

Keywords

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