We report first results on the development of a new system for a GANEX 2nd cycle developed by the “ACSEPT” project. A
solvent system consisting of 0.2 M N,N,N’,N’-tetra-n-octyl-diglycolamide (TODGA) + 0.5 M N,N’-dimethyl-N,N’-dioctyl-2-
(2-hexyloxyethyl)malonamide (DMDOHEMA) in kerosene was formulated which co-extracts TRU elements and lanthanides
with high distribution ratios and allows for Pu(IV) loading up to ~40 g·L1 at 3 M HNO3. Neptunium redox chemistry and
extraction in the TODGA/DMDOHEMA phase has been studied in order to identify optimum conditions for Np extraction.
Further, the behaviour of non-lanthanide fission products was investigated to identify a substitute for oxalic acid (used as a Zr
masking agent in DIAMEX processes where there is no Pu in the feed). 1,2-cyclohexanediaminetetraacetic acid (CDTA)
efficiently suppresses the extraction of Zr and also masks Pd which would otherwise be co-extracted.
KATIE Bell;
CARPENTIER C;
CARROTT Michael;
GEIST Andreas;
GREGSON C;
HERES Xavier;
MAGNUSSON Daniel;
MALMBECK Rikard;
MCLACHLAN Fiona;
MODOLO G.;
MÜLLICH Udo;
SYPULA Michal;
TAYLOR Robin;
WILDEN Andreas;
2013-02-28
Elsevier
JRC76541
1876-6196,
http://www.sciencedirect.com/science/article/pii/S1876619612001350,
https://publications.jrc.ec.europa.eu/repository/handle/JRC76541,
10.1016/j.proche.2012.10.061,
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