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Korean Journal of Metals and Materials > Volume 55(1); 2017 > Article
Korean Journal of Metals and Materials 2017;55(1): 53-59. doi: https://doi.org/10.3365/KJMM.2017.55.1.53
Ca(OH)2를 이용한 레늄 산화물의 포집반응 특성 연구
이태교, 은희철, 최정훈, 이기락, 한승엽, 박환서
한국원자력연구원 핵주기공정개발부
A Study on the Trapping Characteristics of Rhenium Oxide Using Ca(OH)2
Tae-Kyo Lee, Hee-Chul Eun, Jung-Hoon Choi, Ki-Rak Lee, Seung-Youb Han, Hwan-Seo Park
Nuclear Fuel Cycle Process Development Division, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
Correspondence  Hee-Chul Eun ,Tel: +82-42-868-2712, Email: ehc2004@kaeri.re.kr
Received: 6 July 2016;  Accepted: 29 July 2016.  Published online: 5 January 2017.
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.
Keywords: oxides, chemical synthesis, crystal structure, X-ray diffraction, rhenium trapping
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