| Title |
A Study on the Trapping Characteristics of Rhenium Oxide Using Ca(OH)2 |
| Authors |
이태교(Tae-kyo Lee); 은희철(Hee-chul Eun); 최정훈(Jung-hoon Choi); 이기락(Ki-rak Lee); 한승엽(Seung-youb Han); 박환서(Hwan-seo Park) |
| DOI |
https://doi.org/10.3365/KJMM.2017.55.1.53 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
oxides; chemical synthesis; crystal structure; X-ray diffraction; rhenium trapping |
| Abstract |
The objective of this study was to obtain basic data for trapping gaseous technetium (Tc) oxide generated from the voloxidation process in spent nuclear fuel pyroprocessing. Rhenium (Re) and Ca(OH)2 were used as surrogates for the technetium and a trapping material, respectively. The trapping characteristics of rhenium oxide were investigated with changing temperatures and molar ratios of calcium (Ca) over rhenium, and the thermal behaviors of the trapping products were observed. The products following after the trapping test were identified as Ca(ReO4)2 and Ca5Re2O12. The conversion to Ca5Re2O12 was preferred with increasing temperatures, and the trapping products were completely converted into Ca5Re2O12 under conditions exceeding 800 ℃, or when maintained at 750 ℃ for 4 hr. The trapping efficiency at a molar ratio of 2.5 (Ca:Re=5:2) was significantly superior to that at the molar ratio of 2. (Received July 6, 2016; Accepted July 29, 2016) |