Journal Article

FZJ-2022-01349

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Selective actinide(III) separation using 2,6-bis[1-(propan-1-ol)-1,2,3-triazol-4-yl]pyridine (PyTri-Diol) in the innovative-SANEX process: laboratory scale counter current centrifugal contactor demonstration

Wilden, A. (Corresponding author)FZJ* ; Schneider, D.FZJ* ; Paparigas, Z.FZJ* ; Henkes, M.FZJ* ; Kreft, F.FZJ* ; Geist, A. ; Mossini, E. ; Macerata, E. ; Mariani, M. ; Gullo, M. C. ; Casnati, A. ; Modolo, G.FZJ*

2022
˜Deœ Gruyter Berlin

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Please use a persistent id in citations: http://hdl.handle.net/2128/31055  doi:10.1515/ract-2022-0014

Abstract: An innovative-SANEX process for the selective separation of the trivalent actinides americium and curium from a simulated PUREX raffinate solution was successfully demonstrated on the laboratory scale using a 16-stage 1 cm annular centrifugal contactor setup. The solvent was composed of 0.2 mol L−1 N,N,N',N'-tetra-n-octyl-diglycolamide (TODGA) and 5% v/v 1-octanol in a kerosene diluent. Zr(IV) and Pd(II) co-extraction was prevented using trans-1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acid (CDTA) as a masking agent in the feed. The actinide(III) selective back-extraction was achieved using 2,6-bis[1-(propan-1-ol)-1,2,3-triazol-4-yl]pyridine (PyTri-Diol) in 0.45 mol L−1 HNO3 as a CHON alternative to the sulfur-containing stripping agent used in a previous version of the innovative-SANEX process. The new process described in this paper showed excellent performance for the recovery of An(III). An An(III) product with a quasi-quantitative recovery of americium and curium (≥99.9%) and very good separation from fission and activation products was obtained (decontamination factors ≥4,000). Only a slight contamination with Zr and Ru was observed. This test demonstrates the successful use of molecules containing only carbon, hydrogen, oxygen, and nitrogen atoms (so-called CHON molecules) for the selective separation of An(III) from a simulated PUREX raffinate solution. By avoiding sulfur- or phosphorous-containing molecules, the generation of secondary radioactive waste during process operation can be reduced drastically.

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Contributing Institute(s):

1. Nukleare Entsorgung und Reaktorsicherheit (IEK-6)

Research Program(s):

1. 1412 - Predisposal (POF4-141) (POF4-141)
2. GENIORS - GEN IV Integrated Oxide fuels recycling strategies (755171) (755171)
3. PATRICIA - Partitioning And Transmuter Research Initiative in a Collaborative Innovation Action (945077) (945077)

Appears in the scientific report 2022

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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