Inorganic Chemicals Industry >
Study on removal of metal ions from highly radioactive waste streams by micro/nano bubbles
Received date: 2022-12-09
Online published: 2023-07-13
The spent fuel reprocessing process produces waste liquids containing 155Eu，90Sr，137Cs，149Sm and other intermediate and long half-life nuclides，which are highly radioactive.The treatment of high-level radioactive liquid waste（HLLW） is a key step in spent fuel reprocessing.Previous methods such as precipitation and adsorption have all generated a significant amount of secondary waste.To solve this problem，the method of removing metal ions from waste liquid by micro/nano bubble ion flotation was innovatively proposed，and the process of removing metal ions by micro/nano bubbles was modeled by finite element method.The generation and diffusion of micro/nano bubbles in solution and the removal process of metal ions were explored，and the effects of metal ion valence，adsorption reaction equilibrium constant，temperature，etc.on the flotation process were analyzed，and the selective flotation characteristics was further studied when multiple metal ions were coexisted.The results showed that metal ions with high equilibrium constants and high valence states were more easily flotation from solution，and for metal ions with equilibrium constants greater than 10，more than 90% removal rate could be achieved.Controlling the concentration of micro/nanobubble and the concentration of surfactant could enrich the metal ions with equilibrium constants greater than 0.5 by selective flotation.The results of the study were of great guidance for the removal of metal ions from HLLW.
DONG Yizhuo , LI Hongru , SUN Ke , YIN Junlian , ZHOU Wentao , WANG Dezhong . Study on removal of metal ions from highly radioactive waste streams by micro/nano bubbles[J]. Inorganic Chemicals Industry, 2023 , 55(7) : 81 -88 . DOI: 10.19964/j.issn.1006-4990.2022-0729
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