Deliquescence of Eutectic LiCl-KCl Diluted with NaCl for Interim Waste Salt Storage

Molten eutectic LiCl-KCl salt is a widely used electrolyte for electrorefining uranium from spent nuclear fuel. Due to the hygroscopic nature of this salt, such operations must be performed under controlled atmospheric conditions, and waste salts require careful storage avoid deliquescence corrosion container materials. This study investigated potential processing path reducing degree through dilution varying extents with NaCl. The hydration behavior diluted NaCl was evaluated in terms mass gain due water absorption, (including first appearances standing water), evidence stainless steel containers humid air environment (40°C, 20% relative humidity). In environment, pure exhibited 50 % increase absorption showed after 24 h. Waste required loadings 89 order prevent 3 absorption. After periodic observation 48 h, observed near all ingots exception samples. Dilution 89% also found reduce when stored crucibles. While greatly decreases steady-state hydration, volume increased ~10× procedure.