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KMID : 1024520190280060553
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Journal of the Environmental Sciences
2019 Volume.28 No. 6 p.553 ~ p.559
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Zeolitification Characteristics of Coal Fly Ash by Amount of Na2CO3 Using the Fusion/Hydrothermal Method
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Lee Chang-Han
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Abstract
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In this study, zeolitic materials at Na2CO3/CFA ratio of 0.6 - 1.8 were synthesized from coal fly ash from a thermal power plant using a fusion/hydrothermal method. The zeolitic materials were found to have cubic crystals structure and X-ray diffraction (XRD) peaks of Na-A zeolite by XRD and SEM analysis. When the zeolitic materials were synthesized from the coal fly ash, the XRD peaks of the zeolitic materials at Na2CO3/CFA ratios of 0.9-1.8 had the same location as the XRD peaks of commercial Na-A zeolite. The XRD peaks of the Na-A zeolite (Na12Al12Si12O4827.4H2O) were confirmed in the 2θ in the range of 7.18-34.18. However, it was also confirmed that peaks of CaCO3, an impurity inhibiting synthesis of Na-A zeolite from CaO and Na2CO3 in the coal fly ash, occurred in the XRD peaks of the zeolitic materials at Na2CO3/CFA ratio of 1.5-1.8. The crystallinities of the zeolitic materials tended to increase gradually within the Na2CO3/CFA ratio range of 0.6-1.8.
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KEYWORD
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Coal fly ash, Fusion, Hydrothermal, Zeolitic material, Synthesis
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