Extraction of transuranic elements from high-level waste
Creators
- 1. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Description
The present study on the counter-current continuous extraction and back-extraction offered a promising prospect of separating TRU from HLW by the DIDPA extraction process which consisted of the following three steps; simultaneous extraction of TRU, Np, Pu, Am and Cm (and rare earths) with 0.5 M DIDPA - 0.1 M TBP solvent, back-extraction of trivalent TRU, Am and Cm, with 4 M HNO3, and back-extraction of TRU actinides, Np and Pu, with oxalic acid. At the extraction step, temperature should be raised and H2O2 should be added several times. The contacting time of the aqueous and organic phases is the most important parameter for Np extraction. Raising temperature at the first back-extraction step also has a good effect on the recovery of Am and Cm. The back-extraction of Np with oxalic acid is a simple process without change of Np oxidation state. A small part of Ru remained in the used solvent. However, its concentration was not so high that its remaining would have no influence on the several times recycling of the solvent. (author)
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Additional details
Publishing Information
- Imprint Title
- Proceedings of the third international symposium on advanced nuclear energy research
- Imprint Pagination
- 462 p.
- Journal Page Range
- p. 402-407.
- Report number
- INIS-JP--005
Conference
- Title
- 3. international symposium on advanced nuclear energy research.
- Dates
- 13-15 Mar 1991.
- Place
- Mito, Ibaraki (Japan).
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 23083861
- Subject category
- S12: MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- AQUEOUS SOLUTIONS; BENCH-SCALE EXPERIMENTS; CHEMICAL STATE; HIGH-LEVEL RADIOACTIVE WASTES; LIQUID WASTES; MIXER-SETTLERS; NEPTUNIUM COMPOUNDS; NITRIC ACID; OXALIC ACID; PARTITION; QUANTITY RATIO; SCRUBBING; SOLVENT EXTRACTION; TBP; TEMPERATURE DEPENDENCE
- Descriptors DEC
- ACTINIDE COMPOUNDS; BUTYL PHOSPHATES; CARBOXYLIC ACIDS; DICARBOXYLIC ACIDS; DISPERSIONS; EQUIPMENT; ESTERS; EXTRACTION APPARATUSES; HOMOGENEOUS MIXTURES; HYDROGEN COMPOUNDS; INORGANIC ACIDS; INORGANIC COMPOUNDS; MATERIALS; MIXTURES; NITROGEN COMPOUNDS; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC PHOSPHORUS COMPOUNDS; OXYGEN COMPOUNDS; PHOSPHORIC ACID ESTERS; RADIOACTIVE MATERIALS; RADIOACTIVE WASTES; SEPARATION EQUIPMENT; SEPARATION PROCESSES; SOLUTIONS; TRANSURANIUM COMPOUNDS; WASTES