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Purification rate of uranyl nitrate hexahydrate crystal for transuranium elements on isothermal sweating phenomenon / Masaumi Nakahara in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11661-11666 Titre : Purification rate of uranyl nitrate hexahydrate crystal for transuranium elements on isothermal sweating phenomenon Type de document : texte imprimé Auteurs : Masaumi Nakahara, Auteur ; Kazunori Nomura, Auteur ; Tsutomu Koizumi, Auteur Année de publication : 2011 Article en page(s) : pp. 11661-11666 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Purification Résumé : For the purpose of further increasing decontamination performance, the purification behavior of uranyl nitrate hexahydrate (UNH) crystals was studied in the static system. The approach to purification of UNH crystals recovered from the irradiated fast reactor core fuel using a dissolver solution was examined by an isothermal sweating process, which involves heating to the melting point of the crystal. Since transuranium (TRU) elements were present as liquid impurities in the UNH crystal, their decontamination factors (DFs) were improved using this process. The DFs of Cs and TRU elements for the UNH crystals had a tendency to increase with time and were kept virtually constant by 240 min. Not having been precipitated as Cs2Pu(NO3)6 during the crystallization, Pu remained in the mother liquor and was removed by the sweating process. The purification rate coefficients of UNH crystals for Cs and TRU elements were calculated using these experimental data. These values for Pu, 137Cs, 241Am, and 242Cm were evaluated to be 2.13 x 10-4, 2.73 × 10-4, 2.1 × 10-4, and 3.13 x 10-4 s-1 at 57 °C, respectively. DEWEY : 660 ISSN : 0888-5885 [article] Purification rate of uranyl nitrate hexahydrate crystal for transuranium elements on isothermal sweating phenomenon [texte imprimé] / Masaumi Nakahara, Auteur ; Kazunori Nomura, Auteur ; Tsutomu Koizumi, Auteur . - 2011 . - pp. 11661-11666. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11661-11666 Mots-clés : Purification Résumé : For the purpose of further increasing decontamination performance, the purification behavior of uranyl nitrate hexahydrate (UNH) crystals was studied in the static system. The approach to purification of UNH crystals recovered from the irradiated fast reactor core fuel using a dissolver solution was examined by an isothermal sweating process, which involves heating to the melting point of the crystal. Since transuranium (TRU) elements were present as liquid impurities in the UNH crystal, their decontamination factors (DFs) were improved using this process. The DFs of Cs and TRU elements for the UNH crystals had a tendency to increase with time and were kept virtually constant by 240 min. Not having been precipitated as Cs2Pu(NO3)6 during the crystallization, Pu remained in the mother liquor and was removed by the sweating process. The purification rate coefficients of UNH crystals for Cs and TRU elements were calculated using these experimental data. These values for Pu, 137Cs, 241Am, and 242Cm were evaluated to be 2.13 x 10-4, 2.73 × 10-4, 2.1 × 10-4, and 3.13 x 10-4 s-1 at 57 °C, respectively. DEWEY : 660 ISSN : 0888-5885