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Reinforcement of cobalt leaching resistance of solidified sludge for disposal of radioactive sludge waste by hot isostatic pressing

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Abstract

Cobalt leaching resistance of the solidified radioactive sludge subject to disposal was evaluated. The sludge powders ((Fe2O3), NiO, and Cr2O3) with non-radioactive cobalt powder was homogeneously mixed with ferro frit and treated in hot isostatic pressing process. Although the mixing ratio of the ferro frit in total solidified sludge waste was less than 25% and heating temperature in HIP process was lower than 1000 °C, the cobalt leachability indices in all the solidified sludge were ranged from 13.9 to 18.4. The study showed the solidified sludge waste satisfied the leachability index criteria for waste disposal, which was six.

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Acknowledgements

This study was supported by a research project (20191510301210, Development of Dismantling Technology for the Volume Reduction of Radioactively Contaminated Tanks) funded by the Korea Institute of Energy Technology Evaluation and Planning (KETEP, Korea). This study was also supported by the Korea Institute of Energy Technology Evaluation and Planning and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (grant no. 20214000000410). The results of the ICP-MS and XPS data analysis were obtained using UNIST Central Research Facilities (UCRF) equipment.

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  1. Department of Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulju-gun, Ulsan, 44919, Republic of Korea

    Ki Joon Kang, Sia Hwang & Hee Reyoung Kim

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  1. Ki Joon Kang
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  2. Sia Hwang
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Correspondence to Hee Reyoung Kim.

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Kang, K.J., Hwang, S. & Kim, H.R. Reinforcement of cobalt leaching resistance of solidified sludge for disposal of radioactive sludge waste by hot isostatic pressing. J Radioanal Nucl Chem 333, 53–70 (2024). https://doi.org/10.1007/s10967-023-09247-y

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  • DOI: https://doi.org/10.1007/s10967-023-09247-y

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