Synthesis and characterization of super occluded LiCl-KCl in zeolite-4A as a chloride salt waste form intermediate

Harward, Allison; Elliott, Casey; Shaltry, Michael R.; Carlson, Krista; Yoo, Tae-Sic; Fredrickson, Guy L.; Patterson, Michael N.; Simpson, Michael F.

doi:10.1016/j.jnucmat.2023.154816

Title: Synthesis and characterization of super occluded LiCl-KCl in zeolite-4A as a chloride salt waste form intermediate

Journal Article · Fri Nov 10 00:00:00 EST 2023 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2023.154816· OSTI ID:2281385

^[1]; Elliott, Casey ^[2];

^[3]; Carlson, Krista ^[2];

^[3];

^[1]

Univ. of Utah, Salt Lake City, UT (United States)
Univ. of Nevada, Reno, NV (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Here, this paper reports the hygroscopic properties of eutectic LiCl-KCl after absorption into zeolite-4A, up to salt loadings of 75 wt%. Samples of the salt occluded zeolite were hydrated in a humidity chamber at constant temperature and relative humidity for up to 100 h. At up to 45 wt% salt loading, the un-occluded phase of salt consisted primarily of NaCl, which forms when the Na⁺ ions present in the zeolite framework exchange with Li⁺ and K⁺ ions from the eutectic LiCl-KCl. This results in minimal water absorption and corrosion of contacted stainless steel. At greater than 45 wt% salt loading, water absorption and corrosion progressively worsened. The mixture has a significant amount of excess LiCl-KCl, making it highly hygroscopic. This study reveals an option for the intermediate treatment of waste salt from spent nuclear fuel electrorefiners that could facilitate it to be stored in a non-inert atmosphere for extended periods of time before final conversion into a permanent waste form.

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Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Fuel Cycle and Supply Chain. Fuel Cycle Research and Development Program

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 2281385

Report Number(s):: INL/JOU-23-71887-Rev000

Journal Information:: Journal of Nuclear Materials, Vol. 588; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Synthesis and characterization of super occluded LiCl-KCl in zeolite-4A as a chloride salt waste form intermediate

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