• Title/Summary/Keyword: LiCl-KCl

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Computational Analysis for a Molten-salt Electrowinner with Liquid Cadmium Cathode (액체 카드뮴 음극을 사용한 용융염 전해제련로 전산해석)

  • Kim, Kwang-Rag;Jung, Young-Joo;Paek, Seung-Woo;Kim, Ji-Yong;Kwon, Sang-Woon;Yoon, Dal-Seong;Kim, Si-Hyung;Shim, Jun-Bo;Kim, Jung-Gug;Ahn, Do-Hee;Lee, Han-Soo
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.8 no.1
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    • pp.1-7
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    • 2010

  • In the present work, an electrowinning process in the LiCl-KCl/Cd system is considered to model and analyze the electrotransport of the actinide and rare-earth elements. A simple dynamic modeling of this process was performed by taking into account the material balances and diffusion-controlled electrochemical reactions in a diffusion boundary layer at an electrode interface between the molten salt electrolyte and liquid cadmium cathode. The proposed modeling approach was based on the half-cell reduction reactions of metal chloride occurring on the cathode. This model demonstrated a capability for the prediction of the concentration behaviors, a faradic current of each element and an electrochemical potential as function of the time up to the corresponding electrotransport satisfying a given applied current based on a galvanostatic electrolysis. The results of selected case studies including five elements (U, Pu, Am, La, Nd) system are shown, and a preliminary simulation is carried out to show how the model can be used to understand the electrochemical characteristics and provide better information for developing an advanced electrowinner.

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Recent Progress in Waste Treatment Technology for Pyroprocessing at KAERI (파이로 공정폐기물 처리기술의 최근 KAERI 연구동향)

  • Park, Geun-Il;Jeon, Min Ku;Choi, Jung-Hoon;Lee, Ki-Rak;Han, Seung Youb;Kim, In Tae;Cho, Yung-Zun;Park, Hwan-Seo
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.17 no.3
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    • pp.279-298
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    • 2019

  • This study comprehensively addresses recent progress at KAERI in waste treatment technology to cope with waste produced by pyroprocessing, which is used to effectively manage spent fuel. The goal of pyroprocessing waste treatment is to reduce final waste volume, fabricate durable waste forms suitable for disposal, and ensure safe packaging and storage. KAERI employs grouping of fission products recovered from process streams and immobilizes them in separate waste forms, resulting in product recycling and waste volume minimization. Novel aspects of KAERI approach include high temperature treatment of spent oxide fuel for the fabrication of feed materials for the oxide reduction process, and fission product concentration or separation from LiCl or LiCl-KCl salt streams for salt recycling and higher fission-product loading in the final waste form. Based on laboratory-scale tests, an engineering-scale process test is in progress to obtain information on the performance of scale-up processes at KAERI.

  • https://doi.org/10.7733/jnfcwt.2019.17.3.279 인용 PDF KSCI

Characterization of uranium species in molten salt : An application of synchrotron-based XAFS spectroscopy

  • Cho, Young-Hwan;Choi, In-Kyu;Kim, Won-Ho
    • Proceedings of the Korean Nuclear Society Conference
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    • 2002.10a
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    • pp.319.2-319
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    • 2002

  • Synchrotron-based X-ray absorption spectroscopy has been applied to determine the changes in bulk oxidation state of uranium oxides in molten salt. From an analysis of XANES data, one can determine the cahnges in bulk oxidation-state of U compounds in salts(LiCl/KCl). XAFS spectroscpy is a powerful tool for probing the changes in valence state and structure of uranium compounds in colten salt as well as in noncrystalline form and doped in other matrices.

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