玻璃固化过程中硫酸盐分相和分解行为研究  

Study on Sulfate Phase Segregation and Decomposition in Vitrification Process

作　　者：刘丽君[1] 徐建华[1] 姜耀中[1] 

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《原子能科学技术》2015年第9期1551-1556,共6页Atomic Energy Science and Technology

摘　　要：为解决含高浓度硫酸盐的高放废液在玻璃固化过程中出现的黄相问题,首先需了解硫在玻璃固化过程中的行为,尤其是硫酸盐如何从玻璃熔体中分相以及硫酸盐的主要分解温度等。本文针对模拟高放废液玻璃熔制过程中硫酸盐的分相及分解行为进行了研究,在此基础上提出了消除黄相的方法,并进行了实验验证。结果表明,硫酸盐的分相发生在玻璃熔制的早期阶段,约900℃,且一旦发生分相,很难再溶入玻璃体。黄相中的硫酸盐从800℃便开始分解,随着温度的升高,分解速度加快。在1 150℃熔制2h后,熔体表面的黄相完全消失,同时熔体中的硫含量不再发生变化。To resolve the yellow phase problem ,it is necessary to understand sulphur behaviors in the borosilicate waste glasses , especially the sulfate phase segregation behavior and its main decomposition temperature . The sulfate phase segregation and decomposition in simulated high level liquid waste （HLLW ） vitrification process were studied in this paper . The results indicate that molten sulfate segregation happens at early stage （about 900 ℃ ） of the batch melting .Once sulfate is segregated from the melt ,it is difficult to be redissolved .The sulfate in yellow phase begins to decompose at 800 ℃ ,and decomposition is speeded up with the increase of temperature .After 2 h at 1 150 ℃ ,no yellow phase is found at the melt surface ,and sulfur content retained in the melt doesn’t change any more .Based on the research result ,the methods for elimina‐ting yellow phase were proposed and verified .

关 键 词：高放废液 玻璃固化 硫酸盐 分相 分解 

分 类 号：TL941.113[核科学技术—辐射防护及环境保护]