Données relatives aux équilibres chimiques regissant la séparation zirconium-hafnium

Selective extraction of Hf(IV) over Zr(IV) from aqueous H2SO4 solutions by solvent extraction with acidic organophosphorous based extractants

“…Hure et al proposed a process to extract Zr(IV) over Hf(IV) with 60% tri butyl phosphate (TBP) from 6 mol L -1 nitric acid medium. 24 da Silva et al reported a separation factor of 37 between Zr(IV) and Hf(IV), obtained by extraction with Cyanex 925 from HCl medium. 25 Karve et al described a selective stripping process to separate Zr(IV) over Hf(IV) from loaded Aliquat 336 using 9 mol L -1 HCl for Hf(IV) stripping followed by Zr(IV) stripping with 2 mol L -1 HCl.…”