和离子的特异化和氨诱导的沉
Gregory Leinders1, Beatriz Acevedo1, Frédéric Jutier1
1Institute for Nuclear Materials Science, Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, B-2400 Mol, Belgium.
Inorganic chemistry
|June 9, 2023
概括
在核燃料制造的pH变化过程中研究了海 (Np) 和 (U) 的物种化和降水量. 缩氨有效地沉Np (V) 和Np (VI),这对于溶凝工艺至关重要.
科学领域:
- 核化学 核化学 核化学
- 材料科学 材料科学 材料科学
- 放射化学 放射化学是指辐射化学.
背景情况:
- 了解海王星 (Np) 和 (U) 种类对于核燃料制造至关重要.
- 溶凝工艺是生产混合氧化物 (U,Np) 燃料目标的关键.
研究的目的:
- 研究pH依赖的Np (V),Np (VI) 和U (VI) 离子的物种化和沉.
- 评估Np和U在燃料目标制造的sol-gel转换中的适用性.
- 确定Np和U物种沉的最佳条件.
主要方法:
- 在酸中用水性氨 (NH3) 滴定Np和U离子.
- 监测pH的演变和UV-Vis-NIR吸收光谱.
- 对从酸性到性条件的物种化和降水模式的分析.
主要成果:
- 在pH7.5以上,Np(V) 作为NpO2OH沉,而定量沉需要pH10.
- 在pH1.6-4.0之间,Np(VI) 协调变化,类似于U(VI).
- 在pH值4.0-5.9之间,Np (VI) 和U (VI) 降水重叠.
- 缩的NH3在定量上沉出Np (V) 和Np (VI).
结论:
- 外部凝sol-gel工艺受益于缩的NH3对于Np和U沉.
- 内部凝过程与Np(V) 沉要求不相容.
- 在混合氧化物燃料制造中,对于均的凝,需要含有Np (VI) 和U (VI) 的料.
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