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Sano, Yuichi; Sakamoto, Atsushi; Miyazaki, Yasunori; Watanabe, So; Morita, Keisuke; Emori, Tatsuya; Ban, Yasutoshi; Arai, Tsuyoshi*; Nakatani, Kiyoharu*; Matsuura, Haruaki*; et al.
Proceedings of International Conference on Nuclear Fuel Cycle; Sustainable Energy Beyond the Pandemic (GLOBAL 2022) (Internet), 4 Pages, 2022/07
We developed a hybrid MA(III) recovery process combining MA(III)+Ln(III) co-recovery flowsheet by solvent extraction with TBP and MA(III)/Ln(III) separation flowsheet by simulated moving bed chromatography using HONTA impregnated adsorbents with large particle size porous silica support.
Sano, Yuichi; Arai, Tsuyoshi*; Nakatani, Kiyoharu*; Matsuura, Haruaki*; Kunii, Shigeru*
no journal, ,
JAEA has developed a hybrid process combining solvent extraction and low pressure loss extraction chromatography to achieve a reasonable MA(III) recovery process having superior safety and economy. In the solvent extraction, MA(III) is recovered with Ln(III) using inexpensive TBP extractants and centrifugal contactors having superior phase separation performance. In the extraction chromatography, MA(III) is separated from Ln(III) using specially designed adsorbents for low pressure loss. In this report, the outline of R&D program will be introduced.
Nagase, Midori*; Arai, Tsuyoshi*; Sano, Yuichi; Watanabe, So; Kunii, Shigeru*
no journal, ,
As a separation technology for recovering MA (III) from high-level radioactive liquid waste, we focused on an adsorbent impregnated with an NTA amide extractant. In this study, we synthesized H2EH NTA extractant, which is one of the NTA amide extractants, and investigated the adsorption / elution behavior for rare earth elements.
Sano, Yuichi; Arai, Tsuyoshi*; Nakatani, Kiyoharu*; Matsuura, Haruaki*; Kunii, Shigeru*
no journal, ,
We have been developing a hybrid process combining solvent extraction and low pressure loss extraction chromatography for recovering trivalent minor actinides (MA(III): Am, Cm), which will decrease the waste and have good safety and economic performances. In this presentation, the outline of R&D program and some recent results will be introduced.
Yoshida, Masaaki*; Nemoto, Shuhei*; Nagase, Midori*; Arai, Tsuyoshi*; Emori, Tatsuya; Morita, Keisuke; Ban, Yasutoshi; Watanabe, So; Sano, Yuichi; Kunii, Shigeru*
no journal, ,
In this study, we investigated the adsorption characteristics of simulated nuclides of adsorbents carrying various NTA amide extracts. From the results of this test, It has become clear that HONTA-impregnated adsorbent showed a high adsorption distribution coefficient with respect to Ln (III) at a nitric acid concentration of 10
- 10
M. It has also revealed that all elements quickly reached adsorption equilibrium. In addition, the elution of the extractant and Sty / DVB was not occurred from the results of the extractant elution test from the impregnated adsorbent. We discuss the applicability of the extraction chromatography method using various NTA adsorbents.
Sano, Yuichi; Arai, Tsuyoshi*; Nakatani, Kiyoharu*; Matsuura, Haruaki*; Kunii, Shigeru*
no journal, ,
A MA(III)+Ln(III) co-recovery flowsheet by solvent extraction using TBP and a MA(III)/Ln(III) separation flowsheet by simulated moving bed (SMB) chromatography using HONTA impregnated adsorbent with a large particle size porous silica support that enables low pressure drop operation were designed. The proposed process was confirmed to have advantages in terms of waste generation, safety, and economics compared to previously proposed processes consisting only of solvent extraction or extraction chromatography.