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Stabilization/Solidification of Radioactive LiCl-KCl Waste Salt by Using SiO₂-Al₂O₃-P₂O₅ (SAP) Inorganic Composite: Part 2. The Effect of SAP Composition on Stabilization/Solidification (SiO₂-Al₂O₃-P₂O₅ (SAP) 무기복합체를 이용한 LiCl-KCl 방사성 폐기물의 안정화/고형화: Part 2. SAP조성에 따른 안정화/고형화특성 변화)

Ahn, Soo-Na;Park, Hwan-Seo;Cho, In-Hak;Kim, In-Tae;Cho, Yong-Zun
- Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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- v.10 no.1
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- pp.27-36
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- 2012
Metal chloride waste is generated as a main waste streams in a series of electrolytic processes of a pyrochemical process. Different from carbonate or nitrate salt, metal chloride is not decomposed into oxide and chlorine but it is just vaporized. Also, it has low compatibility with conventional silicate glasses. Our research group adapted the dechlorination approach for the immobilization of waste salt. In this study, the composition of SAP ($SiO_2-Al_2O_3-P_2O_5$) was adjusted to enhance the reactivity and to simplify the solidification process as a subsequent research. The addition of $Fe_2O_3$ into the basic SAP decreased the SAP/Salt ratio in weight from 3 for SAP 1071 to 2.25 for M-SAP( Fe=0.1). The experimental results indicated that the addition of $Fe_2O_3$ increased the reactivity of M-SAP with LiCl-KCl but the reactivity gradually decreased above Fe=0.1. Also, introducing $B_2O_3$ into M-SAP requires no glass binder for the consolidation of reaction products. U-SAP ($SiO_2-Al_2O_3-Fe_2O_3-P_2O_5-B_2O_3$) could effectively dechlorinate the LiCl-KCl waste and its reaction product could be consolidated as a monolithic form without a glass binder. The leaching test result indicated that U-SAP 1071 was more durable than other SAPs wasteform. By using U-SAP, 1 g of waste salt could generated 3~4 g of wasteform for final disposal. The final volume would be about 3~4 times lower than the glass-bonded sodalite. From these results, it could be concluded that the dechlorination approach using U-SAP would be one of prospective methods to manage the volatile waste salt.
https://doi.org/10.7733/jkrws.2012.10.1.027 인용 PDF KSCI