CHEMISTRY AND THERMODYNAMICS OF MOLTEN-SALT REACTOR-FUELS
CHEMISTRY AND THERMODYNAMICS OF MOLTEN-SALT REACTOR-FUELS
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DOI：
10.1016/0022-3115(74)90124-x
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发表时间：
1974-01-01
影响因子：
3.1
通讯作者：
BAES, CF
中科院分区：
文献类型：
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作者：
BAES, CF
通过对各种气体（如HF、H2 O）和固体（通常是氧化物）的非均相平衡的测量，对熔盐增殖堆燃料LiF-BeF 2-ThF 4-UF 4（72-16-12-<1mol%）的化学和热力学有了相当详细的了解。结合纯化合物的热化学数据，这些信息给出了fual组分的形成自由能。它们的熵可以从相应的固体氧化物的已知熵和阳离子上的电荷来估计。它们的活度系数主要取决于盐混合物中LiF的摩尔%。氧化物的溶解度通常随着阳离子电荷的平方除以半径而减小。因此，锕系元素二氧化物，特别是Pa 2 O2（或其加成物）的溶解度很低. Pourbaix图总结了氧化还原电位和氧化物浓度的条件，其中燃料可以包含没有显着的腐蚀或沉淀反应，或条件，其中选择性氧化物沉淀可以进行燃料后处理的目的。
A fairly detailed knowledge of the chemistry and thermodynamics of molten salt breeder reactor fuels, typically LiF-BeF 2 ThF 4-UF 4 (72-16-12-< 1 mol%), has been gained from measurements of heterogeneous equilibria involving various gases (eg HF, H 2 O) and solids (usually oxides). This information combined with the thermochemical data available for the pure compounds has given formation free energies for the fual components. Their entropies can be estimated from the known entropies of the corresponding solid oxides and the charge on the cation. Their activity coefficients depend primarily on the mol% of LiF in the salt mixture. The solubility of oxides generally decreases with the square of the cation charge divided by the radius. Thus the actinide dioxides and, especially, Pa 2 O 2 (or an addition compound of it) are of low solubility. Pourbaix diagrams are presented which summarize the conditions of redox potential and oxide concentration wherein the fuel may be contained without significant corrosion or precipitation reactions, or conditions wherein selective oxide precipitation may be carried out for purposes of fuel reprocessing.