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KMID : 1171820040190040001
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Journal of Environmental and Sanitary Engineering
2004 Volume.19 No. 4 p.1 ~ p.8
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Thermal Stability of Cesium Reacted with Fly Ash in Hydrogen Atmosphere
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Shin Jin-Myeong
Kim Kwang-Yeol
Park Jang-Jin
Shin Seol-Woo
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Abstract
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This study has been investigated to analyze the thermal stability of cesium reacted with fly ash with changing mole ratio of Cs/Al in hydrogen atmosphere. When the CsNO₃ and fly ash were reacted at 1000℃ in hydrogen atmosphere, cesium nepheline(CsAlSiO₄) phase began to emerge in addition to pollucite(CsAlSi₂O_6) phase when the cesium loading quantity was greater than 0.32(g-Cs₂O/g-fly ash). Cesium nepheline(CsAlSiO₄) phase increased with increasing cesium loading quantity. When cesium trapped on a fly ash was exposed to 1200℃ in hydrogen atmosphere, no weight loss due to the volatilization was shown until the cesium loading quantity was reached at 0.32(g-Cs₂O/g-fly ash). In the case of the cesium loading quantity of 0.48~0.74(g-Cs₂O/g-fly ash) in hydrogen atmosphere, the weight loss increased with increasing the cesium loading quantity. This is considered to be due to the cesium nepheline(CsAlSiO₄) whose vapor pressure is higher than that of pollucite(CsAlSiO_6).
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KEYWORD
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fly ash, cesium, pollucite, cesium-nepheline, thermal stability
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