高放废液玻璃固化贵金属沉积研究进展

Research Progress of Noble Metal Deposition in Vitrification of High-Level Liquid Wastes

动力堆乏燃料后处理产生的高放废液因富含贵金属,在玻璃固化时可能发生贵金属沉积,从而造成出料口堵塞并导致熔炉底部电极的损坏。本文广泛调研了国内外高放废液玻璃固化中贵金属的沉积问题,对相关解决方案进行了总结,主要包括熔炉结构的改进与贵金属分离回收。高燃耗的乏燃料贵金属含量高,须在研究贵金属沉积行为的基础上,综合考虑以上两种解决方案。相关结果可为国内高放废液玻璃固化的运行提供一定的参考。

The noble metal deposition will occur to block the discharge port and cause damage to the bottom electrode of the furnace when the high-level liquid waste from power reactor spent fuel reprocessing,rich in noble metals,were vitrified.This paper summarizes the related solutions,mainly including furnace structure improvement and the separation and recovery of noble metal,by investigating noble metal deposition phenomena and problems in the vitrification of high-level liquid waste at home and abroad.The paper points out that for the high content of noble metals in spent fuels with deep burnup,the combination of above two solutions must be considered on the basis of studying the deposition behavior of precious metals in the furnace.The research in this paper can provide a certain reference for the operation of domestic high-level liquid waste glass vitrification.