TY - JOUR
T1 - Solvent Extraction of Am(III), Cm(III), and Ln(III) Ions from Simulated Highly Active Raffinate Solutions by TODGA Diluted in Aliquat-336 Nitrate Ionic Liquid
AU - Zsabka, Peter
AU - Van Hecke, Karen
AU - Adriaensen, Lesley
AU - Wilden, Andreas
AU - Modolo, Giuseppe
AU - Verwerft, Marc
AU - Binnemans, Koen
AU - Cardinaels, Thomas
N1 - Score=10
PY - 2019/2/4
Y1 - 2019/2/4
N2 - The extraction behavior of americium(III), curium(III) (minor actinides, MA), fission products (lanthanides (Ln(III)), Mo, Ru, Pd, and Rh), and corrosion products (Zr and Fe) was studied in batch solvent extraction experiments
using the room-temperature ionic liquid (IL) Aliquat-336 nitrate ([A336][NO3]) and a solvent composed of 0.05 M TODGA in [A336][NO3]. From acidic, dilute Ln(III) feed solutions, [A336][NO3] extracts nitric acid (D ≈ 0.5) and partially An(III) as well as Ln(III) (DAm = 0.02–0.1, DEu, and DCm = 0.01–0.04). The influence of the acid concentrations and kinetics on extraction and back-extraction of Ln(III) and An(III) by 0.05 M TODGA in [A336][NO3] was investigated using radiotracer-spiked dilute Ln(III) feed solutions. With the solvent composed of 0.05 M TODGA in [A336][NO3], DAn and DLn increase as a function of aqueous feed acidity. In the case of a spiked, simulated highly active raffinate (HAR) feed solution, [A336][NO3] extracts La(III) (DLa = 1.36), Ru (DRu = 1.64), and Pd (DPd = 38), while the distribution ratios of other Ln(III) and An(III) were lower than unity. The solvent composed of 0.05 M TODGA in [A336][NO3] co-extracted from HAR Zr(IV) (DZr> 300), Pd (DPd = 206), and Ln(III) (DLn> 1, except for Nd(III)), but An(III) were retained in the aqueous phase. The interference caused by the
co-extraction of several fission (Zr, Pd, Ru, and Mo) and corrosion (Zr) products, which are present in the HAR at relatively high concentrations, was suppressed usingmasking agents (oxalic acid and trans-1,2-diaminocyclohexane-N,N,N’,N’- tetraacetic acid, CDTA). In the case of the actual HAR solution, the kinetics were found to be faster compared with the extraction from dilute Ln(III) feed solutions, possibly due to the different aqueous speciation of the Ln(III) and An(III).
AB - The extraction behavior of americium(III), curium(III) (minor actinides, MA), fission products (lanthanides (Ln(III)), Mo, Ru, Pd, and Rh), and corrosion products (Zr and Fe) was studied in batch solvent extraction experiments
using the room-temperature ionic liquid (IL) Aliquat-336 nitrate ([A336][NO3]) and a solvent composed of 0.05 M TODGA in [A336][NO3]. From acidic, dilute Ln(III) feed solutions, [A336][NO3] extracts nitric acid (D ≈ 0.5) and partially An(III) as well as Ln(III) (DAm = 0.02–0.1, DEu, and DCm = 0.01–0.04). The influence of the acid concentrations and kinetics on extraction and back-extraction of Ln(III) and An(III) by 0.05 M TODGA in [A336][NO3] was investigated using radiotracer-spiked dilute Ln(III) feed solutions. With the solvent composed of 0.05 M TODGA in [A336][NO3], DAn and DLn increase as a function of aqueous feed acidity. In the case of a spiked, simulated highly active raffinate (HAR) feed solution, [A336][NO3] extracts La(III) (DLa = 1.36), Ru (DRu = 1.64), and Pd (DPd = 38), while the distribution ratios of other Ln(III) and An(III) were lower than unity. The solvent composed of 0.05 M TODGA in [A336][NO3] co-extracted from HAR Zr(IV) (DZr> 300), Pd (DPd = 206), and Ln(III) (DLn> 1, except for Nd(III)), but An(III) were retained in the aqueous phase. The interference caused by the
co-extraction of several fission (Zr, Pd, Ru, and Mo) and corrosion (Zr) products, which are present in the HAR at relatively high concentrations, was suppressed usingmasking agents (oxalic acid and trans-1,2-diaminocyclohexane-N,N,N’,N’- tetraacetic acid, CDTA). In the case of the actual HAR solution, the kinetics were found to be faster compared with the extraction from dilute Ln(III) feed solutions, possibly due to the different aqueous speciation of the Ln(III) and An(III).
KW - ionic liquids
KW - lanthanides
KW - minor actinides
KW - nuclear fuel reprocessing
KW - solven extraction
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/34789576
U2 - 10.1080/07366299.2018.1545288
DO - 10.1080/07366299.2018.1545288
M3 - Article
SN - 1532-2262
VL - 36
SP - 519
EP - 541
JO - Solvent extraction and ion exchange
JF - Solvent extraction and ion exchange
IS - 6
ER -