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Thermal Stability of Cesium Reacted with Fly Ash in Hydrogen Atmosphere  

Shin Jin-Myeong (Dept. of DUPIC Facility and Process Waste Management, KAERI)
Kim Kwang-Ryul (Dept. of Environmental Eng. Chungbuk National Univ.,)
Park Jang-Jin (Dept. of DUPIC Facility and Process Waste Management, KAERI)
Shin Seol-Woo (Dept. of DUPIC Facility and Process Waste Management, KAERI)
Publication Information
Journal of environmental and Sanitary engineering / v.19, no.4, 2004 , pp. 1-8 More about this Journal
Abstract
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 $CsNO_3$ and fly ash were reacted at $1000^{\circ}C$ in hydrogen atmosphere, cesium $nepheline(CsAlSiO_4)$ Phase began to emerge in addition to $pollucite(CsAlSi_2O_6)$ phase when the cesium loading quantity was greater than $0.32(g-Cs_2O/g-fly\; ash)$. Cesium $nepheline(CsAlSiO_4)$ Phase increased with increasing cesium loading quantity. When cesium trapped on a fly ash was exposed to $1200^{\circ}C$ in hydrogen atmosphere, no weight loss due to the volatilization was shown until the cesium loading quantity was reached at $0.32(g-Cs_2O/g-fly\; ash)$. In the case of the cesium loading quantity of $0.48-0.74(g-Cs_2O/g-fly\;ash)$ in hydrogen atmosphere, the weight loss increased with increasing the cesium loading quantity. This is considered to be due to the cesium $nepheline(CsAlSiO_4)$ whose vapor pressure is higher than that of $pollucite(CsAlSi_2O_6)$.
Keywords
fly ash; cesium; pollucite; cesium-nepheline; thermal stability;
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