Fly ash의 NaOH 용융처리에 의한 고순도 Na-P1 Zeolite의 합성
Synthesis of Highly Pure Na-P1 Zeolite by NaOH Fusion Treatment of Fly Ash
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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℃, whereas only Na-P1 zeolite was formed above 550℃. 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 1/5.0～1/7.5 after NaOH fusion treatment at 550℃ for 2 hours was about 398 cmol+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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