Phosphate-based glasses and glass–ceramics for immobilization of simulated radioactive sludge via microwave sintering: mechanism and performance

IF 1.5 3区化学 Q3 CHEMISTRY, ANALYTICAL

Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2025-01-23 DOI:10.1007/s10967-024-09906-8

Kun Huang, Gaiyuan Chen, Xiangyang Li, Yupeng Xie, Yong Liu, Yang Yang, Yuzhen Mai, Keyou Shi

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Abstract

The safe disposal of radioactive sludge generated from the use of nuclear energy is crucial. In this study, the simulated radioactive sludge was successfully vitrified via microwave sintering with the addition of NH₄H₂PO₄, forming Na₂O-Al₂O₃-Fe₂O₃-P₂O₅ (SAIP) system glass, and monazite glass–ceramic was simultaneously produced. The phase evolution, microstructure, density, and chemical stability of the sintered samples were systematically researched. The results indicated that vitrification of the sintered samples can be achieved when the NH₄H₂PO₄ content in the radioactive sludge reaches 65 wt.% at temperatures of 1200 °C and 1300 °C. The maximum solid solubility level of Nd in the glass structure was 45 wt.% at 1200 °C and 46 wt.% at 1300 °C. Moreover, the density of the sintered samples ranged from 2.62 to 3.12 g/cm³, and they exhibited excellent leaching resistance. The results of this study provide a new perspective for the safe disposal of radioactive sludge.

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微波烧结固定模拟放射性污泥的磷基玻璃和微晶玻璃：机理和性能

安全处理利用核能产生的放射性污泥至关重要。本研究在模拟放射性污泥中加入NH4H2PO4，通过微波烧结成功玻璃化，形成Na2O-Al2O3-Fe2O3-P2O5 （SAIP）体系玻璃，同时制得单氮石微晶玻璃。系统地研究了烧结试样的相演化、显微组织、密度和化学稳定性。结果表明，当放射性污泥中NH4H2PO4含量达到65 wt.%，温度分别为1200℃和1300℃时，烧结样品可以实现玻璃化。在1200℃和1300℃时，Nd在玻璃结构中的最大固溶度分别为45wt .%和46wt .%。烧结样品的密度在2.62 ~ 3.12 g/cm3之间，具有良好的抗浸出性能。研究结果为放射性污泥的安全处理提供了新的思路。

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来源期刊

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

期刊介绍： An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.