Effects of Pretreatment of Ba(NO3)2 on Phase Segregation of Sulfate in High-Level Liquid Waste Vitrification Process

In order to supress the formation of yellow phase during vitrification, simulated high-level liquid waste(HLLW) with high content of sulfur and sodium were pretreated by adding Ba(NO3)2 solution, and then borosilicate glass waste forms were prepared by traditional melting method. The effects of pret...

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Bibliographic Details
Published inHé huàxué yŭ fàngshè huàxué Vol. 43; no. 6; pp. 459 - 464
Main Author WU Lang;XU Li-guo;LEI Jie;WANG Bin;TENG Yuan-cheng
Format Journal Article
LanguageChinese
Published Editorial Office of Journal of Nuclear and Radiochemistry 01.12.2021
Subjects
ba(no3)2
high-level liquid waste
sulfate
vitrification
yellow phase
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Summary:In order to supress the formation of yellow phase during vitrification, simulated high-level liquid waste(HLLW) with high content of sulfur and sodium were pretreated by adding Ba(NO3)2 solution, and then borosilicate glass waste forms were prepared by traditional melting method. The effects of pretreatment on the formation of yellow phase and its phase structure and microstructure were mainly investigated. The sulfur content retained in the glass waste forms before and after pretreatment were compared. The results show that SO2-4 ions in the simulated HLLW can be immobilized in BaSO4. The amount of yellow phase during the vitrification process can be markedly reduced by the pretreatment. For the generated yellow phase before pretreatment, the main constituents are Na2SO4 and LiNaSO4 along with a small amount of CaMoO4 and Na2CrMoO4. After pretreatment, the X-ray diffraction peak intensity of LiNaSO4 decreases and BaSO4, BaMoO4, and BaCrO4 phases appear. The sulfur content retained in the glass waste form bef
ISSN:0253-9950