Extraction of V(Ⅴ) and Fe(Ⅲ) from aqueous medium containing various concentrations of mineral acids and salts into 1-phenyl-3-methyl-4-butyrylpyrazolone in mixed organic phase

摘要

The extraction behaviour of V(Ⅴ) and Fe(Ⅲ) from aqueous medium containing various concentrations of acid and salt into chloroform-butanol and methyl isobutyl ketone-butanol mixtures, each containing 0.05 M 1-phenyl-3-methyl-4-butyrylpyrazolone (HBuP) have been studied. Fe(Ⅲ) was extracted quantitatively from 2.5-10 M HCl into 0.05 M HBuP-MIBK-BuOH. An optimum separation factor D_(Fe)/D_V = 10~6 has been obtained for mixtures of both metals. Hence, Fe(Ⅲ) is separated from V(Ⅴ) in 6 M HCl using 0.05 M HBuP-MIBK-BuOH as the extractant. With 0.05 M HBuP-CHCl_3-BuOH, V(Ⅴ) is efficiently extracted from 0.9 M HNO_3 into the organic phase. The study shows that Fe(Ⅲ) is extracted as Fe(BuP)_3 species between 0.4 M acid concentration, and as H_2BuP~+FeCl_4~- species between 6.10 M (HCl) acid concentration. Vanadium is extracted as VO_2(BuP).HBuP species from acid solutions.