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Properties of the LiCl-KCl-Li2O system as operating medium for pyro-chemical reprocessing of spent nuclear fuel
Journal of Nuclear Materials ( IF 3.1 ) Pub Date : 2018-01-04 , DOI: 10.1016/j.jnucmat.2018.01.004
Albert Mullabaev , Olga Tkacheva , Vladimir Shishkin , Vadim Kovrov , Yuriy Zaikov , Leonid Sukhanov , Yuriy Mochalov

Crystallization temperatures (liquidus and solidus) in the LiCl-Li2O and (LiCl-KCl)-Li2O systems with the KCl content of 10 and 20 mol.% were obtained with independent methods of thermal analysis using cooling curves, isothermal saturation, and differential scanning calorimetry. The linear sweep voltammetry was applied to control the time of the equilibrium establishment in the molten system after the Li2O addition, which depended on the composition of the base melt and the concentration of Li2O. The fragments of the binary LiCl-Li2O and quazi-binary [LiCl-KCl(10 mol.%)]-Li2O and [LiCl-KCl(20 mol.%)]-Li2O phase diagrams in the Li2O concentration range from 0 to 12 mol.% were obtained. The KCl presence in the LiCl-KCl-Li2O molten mixture in the amount of 10 and 20 mol.% reduces the liquidus temperature by 30 and 80°, respectively, but the region of the homogeneous molten state of the system is considerably narrowed, which complicates its practical application. The Li2O solubility in the molten LiCl, LiCl-KCl(10 mol.%) and LiCl-KCl(20 mol.%) decreases with increasing the KCl content and is equal to 11.5, 7.7 and 3.9 mol.% at 650°С, respectively. The LiCl-KCl melt with 10 mol.% KCl can be recommended for practical use as a medium for the SNF pyro-chemical reprocessing at temperature below 700 °C.



中文翻译:

LiCl-KCl-Li 2 O系统作为乏核燃料热化学后处理的工作介质的性质

使用冷却曲线,等温饱和度的独立热分析方法,获得了KCl含量分别为10和20 mol。%的LiCl-Li 2 O和(LiCl-KCl)-Li 2 O系统中的结晶温度(液相线和固相线)和差示扫描量热法。Li 2 O加入后,采用线性扫描伏安法控制熔融体系中平衡建立的时间,这取决于基础熔体的组成和Li 2 O的浓度。二元LiCl-Li的碎片2 O和自动准二进制[氯化锂-氯化钾(10摩尔%。)] -李2 O和[氯化锂-氯化钾(20摩尔%。)] -李2的李O相图2O的浓度范围为0至12摩尔%。LiCl-KCl-Li 2 O熔融混合物中KCl的存在量分别为10和20 mol。%,会使液相线温度分别降低30和80°,但是系统的均匀熔融状态区域明显变窄,使其实际应用复杂化。Li 2 O在熔融LiCl,LiCl-KCl(10 mol。%)和LiCl-KCl(20 mol。%)中的溶解度随KCl含量的增加而降低,在650°下等于11.5、7.7和3.9 mol。% С。推荐将含10 mol。%KCl的LiCl-KCl熔体实际用作温度低于700°C时SNF热化学后处理的介质。

更新日期:2018-01-04
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