Batch flowsheet test for a GANEX-type process: the CHALMEX FS-13 process
Artikel i vetenskaplig tidskrift, 2022

The Chalmers grouped actinide extraction (CHALMEX) process is focused on the co-separation of actinides from all other elements in spent nuclear fuel solution, with the ultimate purpose of transmuting the actinides into shorter-lived and less radiotoxic elements. Based on solvent extraction equilibrium distribution data of actinides and fission products, a preliminary flowsheet was developed and tested in batch mode. The flowsheet consists of one extraction step with the CHALMEX FS-13 solvent (25 mM CyMe4-BTBP in 30% v/v TBP and 70% v/v FS-13), using hydrophilic masking agents (20 mM bimet and 0.2 M mannitol) in the aqueous phase for the complexation of troublesome fission products. Two nitric acid scrub steps (0.5 M HNO3) were efficient in removing co-extracted acid, all molybdenum and the majority of silver. Two stripping stages (0.5 M glycolic acid at pH 4) were efficient in recovery of the actinides from the organic phase. The need for a solvent clean-up stage for the removal of nickel, cadmium, iron and the remaining silver from the organic phase was demonstrated. Based on the distribution data, it was calculated that a 99.9% recovery of americium is possible using only 3 ideal extraction stages, 3 ideal scrubbing stages and 2 ideal stripping stages.







Thea Lyseid Authen

Chalmers, Kemi och kemiteknik, Energi och material

A. Wilden

Forschungszentrum Jülich

Dimitri Schneider

Forschungszentrum Jülich

Fabian Kreft

Forschungszentrum Jülich

G. Modolo

Forschungszentrum Jülich

Mark Foreman

Chalmers, Kemi och kemiteknik, Energi och material

Christian Ekberg

Chalmers, Kemi och kemiteknik, Energi och material

Solvent Extraction and Ion Exchange

0736-6299 (ISSN) 1532-2262 (eISSN)

Vol. 40 3 189-202


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