期刊
ENERGIES
卷 15, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/en15176477
关键词
sodium aluminoironphosphate glass; magnesium potassium phosphate compound; radioactive waste; spent electrolyte; chlorides; immobilization; leaching; hydrogen peroxide; thermal stability; structure
资金
- Ministry of Science and Higher Education of Russia [075-15-2020-782]
This study focuses on the immobilization of a new type of high-level waste, spent electrolyte, generated during pyrochemical reprocessing of mixed nitride spent uranium-plutonium nuclear fuel. The results showed that both sodium aluminoironphosphate glass and low-temperature mineral-like magnesium potassium phosphate matrix can effectively immobilize the spent electrolyte, meeting modern requirements for high-level waste immobilization.
A new type of high-level waste (HLW) is generated during pyrochemical reprocessing of mixed nitride spent uranium-plutonium nuclear fuel. Such waste is a spent electrolyte, which is a mixture of chloride salts containing approximately 25.7 wt.% LiCl + 31.6 wt.% KCl + 4.1 wt.% CsCl + 5.1 wt.% BaCl2 + 3.8 wt.% SrCl2 + 29.7 wt.% LaCl3, and its immobilization in reliable matrices is an actual radiochemical problem. The structure and hydrolytic stability of sodium aluminoironphosphate (NAFP) glass and a low-temperature mineral-like magnesium potassium phosphate (MPP) matrix, which are promising for spent electrolyte immobilization in the presence of hydrogen peroxide solutions simulating natural water radiolysis products, were studied in this work. The structure of the samples was studied using the SEM-EDS method. It was shown that the initial samples of NAFP glass after leaching in hydrogen peroxide solutions are prone to precipitation of crystalline phases on the surface, which are mainly represented by a mixture of sodium-iron-aluminum pyrophosphates. It was established that the leaching rate of structure-forming components of NAFP and MPP matrices generally increase, but remain at a low level, meeting modern requirements for HLW immobilization. This confirms the effectiveness of the studied matrices for the industrial use of the spent electrolyte.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据