Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Effects of Aluminum Addition and Recycle of NaOH Waste Solution on the Quality of Zeolite Synthesized from Fly Ash

알루미늄 첨가 및 NaOH 폐용액의 재활용이 Fly Ash로부터 합성한 Zeolite의 품질에 미치는 영향

  • Choi, Choong-Lyeal (Institute of Agricultural Science and Technology, Kyungpook National University) ;
  • Lee, Dong-Hoon (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Park, Man (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Song, Kyung-Sik (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Rhee, In-Koo (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Choi, Jyung (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Kim, Jang-Eok (Department of Agricultural Chemistry, Kyungpook National University)
  • 최충렬 (경북대학교 농업과학기술연구소) ;
  • 이동훈 (경북대학교 농화학과) ;
  • 박만 (경북대학교 농화학과) ;
  • 송경식 (경북대학교 농화학과) ;
  • 이인구 (경북대학교 농화학과) ;
  • 최정 (경북대학교 농화학과) ;
  • 김장억 (경북대학교 농화학과)
  • Received : 2005.03.11
  • Accepted : 2005.04.13
  • Published : 2005.04.30
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Abstract

This study was performed to examine the effects of aluminum addition and recycle of NaOH waste solution on CEC and crystallinity of zeolite synthesized from fly ash. The added aluminum was used as the source of zeolite framework in zeolitization of fly ash. CEC and crystallinity of Na-P1 zeolite synthesized with aluminum addition were increased from 285 to $365cmol_c\;kg^{-1}$ and from 44.3 to 57.1% compared to that of simple hydrothermal treatment, respectively. The recycled NaOH solution did not affect the CEC of reaction products, though the crystallinity was decreased a little. Therefore, the additional supply of aluminum could improve the quality of zeolite synthesized from fly ash and the recycle of NaOH during zeolite synthesis can save the chemical without any adverse effects in the quality of synthesized seolite.

Fly ash의 zeolite화 과정에서 제한인자로 작용하는 Alumuinum을 인위적으로 첨가하여 zeolite 결정에 미치는 영향과 zeolite 합성과정에서 다량으로 발생되는 NaOH 폐용액의 재사용이 zeolite의 품질에 미치는 영향을 조사하였다. 첨가된 aluminum은 zeolite 결정구조의 급원으로 이용되어 zeolite의 품질이 크게 향상되었다. Aluminum을 첨가하여 12시간 동안 합성한 zeolite는 첨가하지 않은 zeolite에 비해 CEC는 $285cmol_c\;kg^{-1}$에서 $365cmol_c\;kg^{-1}$으로 증가하였으며, 결정화도는 44.3%에서 57.1%로 증가되었다. Aluminum을 첨가하면서 NaOH 폐용액을 연속으로 5회 재사용하여도 반응생성물의 CEC와 결정화도에는 거의 영향을 미치지 않았다. 또한 NaOH 폐용액의 재사용 휫수가 증가하여도 zeolite의 화학적 조성은 거의 변화되지 않았다. 그러므로 fly ash의 zeolite화 과정에서 aluminum 첨가에 의한 zeolite의 품질은 물론 알칼리 폐용액의 재사용으로 활성효율을 크게 향상시킴으로서 환경적 경제적 부담을 경감시킬 수 있을 것이다.

Keywords

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