Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Synthesis of Highly Pure Na-P1 Zeolite by NaOH Fusion Treatment of Fly Ash

Fly ash의 NaOH 용융처리에 의한 고순도 Na-P1 Zeolite의 합성

  • Choi, Choong-Lyeal (Institute of Agricultural Science & Technology, Kyungpook National University) ;
  • Lee, Dong-Hoon (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Lee, In-Jung (Department of Agronomy, Kyungpook National University) ;
  • Shin, Dong-Hyun (Department of Agronomy, Kyungpook National University) ;
  • Kim, Jang-Eok (Department of Agricultural Chemistry, Kyungpook National University) ;
  • Park, Man (Department of Agricultural Chemistry, Kyungpook National University)
  • Published : 2005.09.30
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Abstract

This study was conducted to elucidate the effects of NaOH fusion treatment on Na-P1 zeolite synthesis from fly ash and to evaluate its optimal condition. NaOH fusion treatment of fly ash led to Na-P1 zeolite with shorter reaction time and higher quality compared that of simple hydrothermal method. Mixed zeolite phases of Na-P1 and hydroxy sodalite were formed by the fusion treatment below $450^{\circ}C$, whereas only Na-P1 zeolite was formed above $550^{\circ}C$. Ratio of NaOH/fly ash, reaction times, fusion temperature and solid/liquid ratio strongly affected the kind and crystallinity of the zeolite formed. The CEC of Na-P1 zeolite formed at the optimum reaction conditions of NaOH/fly ash ratio 0.9 and solid/liquid ratio $1/5.0{\sim}1/7.5$ after NaOH fusion treatment at $550^{\circ}C$ for 2 hours was about $398cmol^+kg^{-1}$ which was 40% higher than those of control products. Therefore, it is clear that NaOH fusion treatment of fly ash in open system could lead to Na-P1 zeolite with high purity.

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References

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