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DOE OSTI2022

Water Sorption/Desorption Characteristics of Eutectic LiCl-KCl Salt-Occluded Zeolites

Molten salt consisting primarily of eutectic LiCl-KCl is currently being used in electrorefiners in the Fuel Conditioning Facility at Idaho National Laboratory. Options are currently being evaluated for storing this salt outside of the argon atmosphere hot cell. The hygroscopic nature of eutectic LiCl-KCl makes is susceptible to deliquescence in air followed by extreme corrosion of metallic cannisters. In this study, the effect of occluding the salt into a zeolite on water sorption/desorption was tested. Two zeolites were investigated: Na-Y and zeolite 4A. Na-Y was ineffective at occluding a high percentage of the salt at either 10 or 20wt% loading. Zeolite-4A was effective at occluding the salt with high efficiency at both loading levels. Weight gain in salt occluded zeolite-4A (SOZ) from water sorption at 20% relative humidity and 40°C was 17wt% for 10% SOZ and 10wt% for 20% SOZ. In both cases, neither deliquescence nor corrosion occurred over a period of 31 days. After hydration, most of the water could be driven off by heating the hydrated salt occluded zeolite to 530°C. However, some HCl forms during dehydration due to salt hydrolysis. Over a wide range of temperatures (320–700°C) and ramp rates (5, 10, and 20°C min -1 ), HCl formation was no more than 0.6% of the Cl - in the original salt.

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS↗

DOE OSTI2020

Materials Data on NaY3 by Materials Project

NaY3 is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Na is bonded to twelve Y atoms to form NaY12 cuboctahedra that share corners with four equivalent NaY12 cuboctahedra, edges with eight equivalent NaY12 cuboctahedra, edges with sixteen equivalent YNa4Y8 cuboctahedra, faces with four equivalent NaY12 cuboctahedra, and faces with eight equivalent YNa4Y8 cuboctahedra. There are four shorter (3.44 Å) and eight longer (3.67 Å) Na–Y bond lengths. There are two inequivalent Y sites. In the first Y site, Y is bonded to four equivalent Na and eight Y atoms to form YNa4Y8 cuboctahedra that share corners with twelve equivalent YNa4Y8 cuboctahedra, edges with eight equivalent NaY12 cuboctahedra, edges with eight equivalent YNa4Y8 cuboctahedra, faces with four equivalent NaY12 cuboctahedra, and faces with ten equivalent YNa4Y8 cuboctahedra. There are four shorter (3.44 Å) and four longer (3.67 Å) Y–Y bond lengths. In the second Y site, Y is bonded in a distorted square co-planar geometry to four equivalent Na and eight equivalent Y atoms.

36 MATERIALS SCIENCE↗