The Fractional Separation of Zirconium and Hafnium by Extraction with Trifluoroacetylacetone¹

Complexation Chemistry of Zirconium(IV), Uranium(VI), and Iron(III) with Acetohydroxamic Acid

“…A slope of 3.7 was determined for the linear regression for the plot of the log(D) versus the log([TTA]), where D is the ratio of the concentration of zirconium in the TTA phase to the concentration of zirconium in the aqueous phase. The slope indicates that in the acidic solutions of our experiments zirconium exists primarily as the Zr 4þ ion, and not as zirconyl ZrO 2þ (18,19).…”

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

“…Most of the reports in the literature are on the selective extraction of Zr(IV) over Hf(IV) from various kinds of source materials . In developing a selective extraction process, selective extraction of the minor element (Hf) over Zr is desirable and has such advantages as ease of multi‐stage repetition, low solvent inventory, small dimension of the equipment and economics of the process (time and power) .…”

Solvent extraction in nuclear technology

“…10,11), thenoyltrifluoroacetone (ref. 12) and tri-n-octylamine (ref. 13), while the addition of thiocyanate to the aqueous phase extends the range of applicable solvents to methyl-iso-butyl ketone (ref.…”