Thermokinetic analysis of spent ion-exchange resins for the optimization of carbonization reactor condition
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- 作者：Hee-Chul Yang ; Si-Young Lee ; Yun-Chung Choi…
- 关键词：Ion ; exchange resin ; Cesium ; Carbonization ; Kinetic analysis ; Optimization
- 刊名：Journal of Thermal Analysis and Calorimetry
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：127
- 期：1
- 页码：587-595
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Physical Chemistry; Analytical Chemistry; Polymer Sciences; Inorganic Chemistry; Measurement Science and Instrumentation;
- 出版者：Springer Netherlands
- ISSN：1588-2926
- 卷排序：127
文摘
Radioactive spent ion-exchange resins, a combustible organic waste, cannot be readily incinerated due to the volatilization of radioactive cesium. The volatilization of metals and the thermal decomposition of organics are thermally stimulated processes. An optimum thermal treatment condition without the volatilization of cesium species but with the substantial decomposition of organics is required for a safe volume reduction of spent ion-exchange resins. Using thermogravimetric analysis methods, this study established the optimum thermal treatment conditions for a substantial decomposition of spent resins with minimized volatilization of cesium species. Kinetic analyses and predictions of the complicated reaction steps involved in the thermal decomposition of spent cation-exchange resins were conducted initially, with the results then used to establish the optimum thermal treatment conditions. Under these optimum conditions, nearly all of the cesium species in the spent resins were converted into thermally stable cesium sulfate (Cs2SO4) at temperatures up to 1000 °C. More than 97 % of cesium species remained after the final burning out of the carbonized spent resins.