Study on $CaCO_3$ Preparation from MSWI Fly Ash

생활쓰레기 소각(燒却)비산재로부터 $CaCO_3$ 제조(製造)에 관한 연구(硏究)

  • Choi, Woo-Zin (Department of Environmental Engineering The University of Suwon) ;
  • Park, Eun-Kyu (Department of Environmental Engineering The University of Suwon)
  • Published : 2006.10.27

Abstract

The total amount of ash generated from the municipal solid waste incineration(MSWI) in Korea was approximately 420,000 tons in 2005 including 68,000 tons of fly ash. Fly ash from MSWI generally contains high amount of CaO (upto ${\sim}50%$) due to the treatment of flue gas by spraying CaO-base materials. Currently, most of fly ash generated is finally ended up with specially designed landfill sites and only less then 20% of fly ash is recycled. In the present work, preparation of $CaCO_3$ from the MSWI ny ash was studied to promote the fly ash recycling. Fly ash obtained from the dust collector in stoker-type MSWI is used to selectively dissolve CaO by using the sugar solution. Then, $CO_2$ gas was passed through the dissolved solution to pro- duce $CaCO_3$ powder. The optimum conditions for CaO dissolution were solid content 10%, reaction time 15 minutes, sugar concentration $10{\sim}15%\;and\;pH\;10.5{\sim}11.0$. The high grade $CaCO_3$ powder was obtained and the experimental conditions are also discussed.

References

  1. 환경부,2006 : 2005 전국 폐기물 발생 및 처리현황
  2. 환경관리공단,2000 : 소각재 안정화 및 재활용 기술에 관한 연구
  3. 송종택 외 4인, 1998 : 화학활성화제에 의한 플라이애쉬-생석회계의 수화반응,한국세라믹학회지, 35(2), pp.185-195
  4. Wiles, C. and Shepherd, P., 1999 : Beneficial use and recycling of municipal waste combustion residues A Comprehensive Resource Document, Nation Renewable Energy Laboratory(NPEL), 6-11
  5. Grasso, D., 1993 : Hazardous Waste Site Remediation: Source Control, Lewis Publishers
  6. Kim, C. E. and Lee, S. K., 1993 : The Effects of Heavy Metal Ions on the Hydration and Microstructure of the Cement Paste, J. of Korean Ceramic Society, 30(11), pp. 967-973
  7. 송효석, 이창희, 2001 : CaO계 슬래그 중 탄산가스 용해 거동에 관한 연구, 대한금속.재료학회지, 39(4), pp. 474-479
  8. 이우근, 김준수, 김진법, 1998 : 소각장별 비산재 중의 중금속 용출특성 및 존재형태, 대한환경공학회지, 20(3), pp. 421-432