Studies on the separation of Am(III) from trivalent lanthanides in high-level waste solution using modifier-free solvent
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Studies on the separation of Am(III) from trivalent lanthanides in highlevel waste solution using modifier-free solvents and aqueous soluble bis-1,2,4-triazines Jeesmon Jose1 · T. Prathibha2 · N. S. Karthikeyan1 · K. A. Venkatesan2 · S. Sriram2 · H. Seshadri3 · B. Venkatachalapathy1 · C. Ravichandran1 Received: 16 July 2020 / Accepted: 2 October 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The selective partitioning of trivalent actinides (An(III)) from high-level liquid waste (HLLW) is considered as an essential step in the management of spent nuclear fuel. The i-SANEX process for the separation of An(III) from the co-existing lanthanides (Ln(III)) in 4 M nitric acid solution and simulated HLLW was studied using a couple of symmetrical diglycolamides (TODGA and TDDGA) and an unsymmetrical diglycolamide (D3DODGA) in n-dodecane as the extraction phase. The selective stripping of Am(III) from the loaded organic phase containing trivalent Ln(III) was investigated using aqueous soluble bis-1,2,4-triazine derivatives such as SO3-Ph-BTP, SO3-Ph-BTBP and SO3-Ph-BTPhen in dilute nitric acid solution. The results revealed that the SF of Eu(III) over Am(III) decreased with increase in the concentration of nitric acid in all cases and SF decreased in the order SO3-Ph-BTP > SO3-Ph-BTBP > SO3-Ph-BTPhen. The co-stripping of lighter lanthanides (La, Ce, Pr, Nd) was also observed during the recovery of Am(III). Keywords Sulphonated bis-1,2,4-triazine · Diglycolamide · FR-SHLLW · i-SANEX process · Americium
Introduction The one-cycle separation of trivalent actinides (Am(III) and Cm(III)) from high-level liquid waste (HLLW) generated from reprocessing of spent nuclear fuel is receiving much attention in the recent past [1–3]. The process involves the group extraction of trivalent actinides from HLLW along Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10967-020-07442-9) contains supplementary material, which is available to authorized users. * N. S. Karthikeyan [email protected] * K. A. Venkatesan [email protected] 1
Chemistry Department, Easwari Engineering College, Ramapuram, Chennai 600089, India
2
Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
3
Safety Research Institute, Energy Regulatory Board, Kalpakkam 603102, India
with the co-existing chemically similar lanthanides (Ln(III)), followed by stripping of actinides (An(III)) alone from the loaded organic phase [4–9]. A couple of reagents are required for An(III) separation in this way. In i-SANEX (innovative-Selective Actinide Extraction) process, a lipophilic extractant selective for Ln(III) and An(III) is used together with a hydrophilic ligand selective for trivalent An(III) [2]. For stripping of An(III) alone from the loaded organic phase, it is necessary to use An(III) selective aqueous soluble complexing agents, that can co-ordinate preferentially with An(III) and recover An(III) from the loaded organic ph
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