Influence of Nitric Acid and Nitrous Acid on Oxidation and Extraction of Neptunium with Double Scrub Flow Sheet in Simplified Solvent Extraction Process
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- Nakahara Masaumi
- Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency
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- Koma Yoshikazu
- Advanced Nuclear System Research and Development Directorate, Japan Atomic Energy Agency
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A simplified solvent extraction process based on U, Pu and Np co-recovery using tri-n-butylphosphate (TBP) as an extractant has been developed for advanced aqueous reprocessing of fast neutron reactor fuel. The influence of the HNO3 concentration in the feed and scrubbing solutions on the behavior of Np is evaluated experimentally and found to be co-extracted into the TBP with U and Pu. Moreover, the leakage ratio of Np to the raffinate is calculated from the changes in HNO2 concentration in the feed solution. 9.89% of the Np leaked to the raffinate in low HNO3 concentration feed and high HNO3 concentration scrubbing solutions. Almost all the Np in a 4.9 mol/dm3 HNO3 feed solution is recovered with U and Pu, based on the experimental flow sheet with double scrubbing solutions of 9 and 1 mol/dm3 HNO3. The experimental results show a large contribution from the HNO3 concentration in the feed solution and at the extraction section to Np(V) oxidation. On the other hand, the calculation results show that high HNO2 concentrations in the feed solution tended to leak Np into the raffinate. The DF of Cs for U, Pu and Np product achieves 105 in all runs.
収録刊行物
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- JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
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JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 44 (5), 313-320, 2011
公益社団法人 化学工学会
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詳細情報 詳細情報について
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- CRID
- 1390001204567569408
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- NII論文ID
- 10029240638
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- NII書誌ID
- AA00709658
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- ISSN
- 18811299
- 00219592
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- NDL書誌ID
- 11162798
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可