Extraction Separation of Lu( Ⅲ ) from Zr(Ⅳ ) ,Ti(Ⅳ) ,Th(Ⅳ ) ,Fe( Ⅲ ) and Mechanism of Zr(Ⅳ) by Bis(2,4,4-trimethylpentyl)phosphinic Acid

摘要

The feasibility of separation of Lu( Ⅲ ) from Zr( Ⅳ ), Th( Ⅳ ), and Fe( Ⅲ ) by Cyanex 272 (bis(2,4,4-trimethylpentyl)phosphinic acid, hereafter abbreviated as H[BTMPP]) in n-hexane from acidic sulphate solutions has been studied. The extraction mechanism of zirconium (Ⅳ ) has been investigated systematically. The extraction of Zr( Ⅳ) proceeds on a cation exchange reaction in the lower aqueous acidity range and a solvating reaction in the higher aqueous acidity range. The stoichiometry of the extraction reaction was determined by slope analysis method. The stripping conditions of Zr(Ⅳ) with mineral acid (H_2SO_4, HCl) have been obtained.