CAJ | 학술논문

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1150℃熔制2 h 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。
위해결함고농도류산염적고방폐액재파리고화과정중출현적황상문제，수선수료해류재파리고화과정중적행위，우기시류산염여하종파리용체중분상이급류산염적주요분해온도등。본문침대모의고방폐액파리용제과정중류산염적분상급분해행위진행료연구，재차기출상제출료소제황상적방법，병진행료실험험증。결과표명，류산염적분상발생재파리용제적조기계단，약900℃，차일단발생분상，흔난재용입파리체。황상중적류산염종800℃편개시분해，수착온도적승고，분해속도가쾌。재1150℃용제2 h 후，용체표면적황상완전소실，동시용체중적류함량불재발생변화。
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 .