Rhenium volatilization in SiO2-KNO3-KReO4 mixtures at elevated temperatures

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Design Pub Date : 2025-02-01 DOI:10.1016/j.nucengdes.2024.113758

Chenchen Niu , Aiqing Chen , Kaiwen Hu , Kai Xu

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Abstract

Due to its long half-life, high fission yield, and high mobility in the groundwater, Technetium-99 (Tc-99) is a troublesome nuclide in nuclear waste. Moreover, the primary concern is the high volatility of Tc during nuclear waste vitrification. Previous studies demonstrated that nitrate significantly affected the Tc volatilization during the vitrification of Tc-containing waste. However, identifying how nitrate affects Tc volatilization is challenging due to the complexity of the composition of nuclear waste. This study used a simplified SiO₂-KNO₃-KReO₄ feed with rhenium (Re) as a Tc non-radioactive surrogate to study the nitrate effect on the Re volatilization at elevated temperatures. The results showed that KNO₃ could facilitate Re volatilization at temperatures below 800 °C when the molar percentage of KNO₃ in the KNO₃-KReO₄ binary system exceeded 60 mol%, which was attributed to the eutectic reaction between KReO₄ and KNO₃ at 310 °C. However, the increased KNO₃ content could inhibit the Re volatilization at temperature above 1200 °C since adding KNO₃ could increase the amorphous phase content, where Re was encapsulated and hardly evaporated.

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来源期刊

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.