Liquid-liquid extraction of cobalt (Ⅱ), nickel (Ⅱ) and copper (Ⅱ) from basic medium using some β-diketones

摘要

The solvent extraction of cobalt(Ⅱ), nickel(Ⅱ) and copper(Ⅱ) using 2,4-pent-dione (Hacac) and 4-phenyl-2, 4-but-dione (Hbzac) is carried out by varying the reagent concentration and pH of the aqueous phase. Each of these metals is quantitatively separated (≈ 98%) from their binary mixtures with monovalent (Ag), divalent (Mn, Zn, Cd, Hg, Mg, Sn, Pb) and trivalent (Cr, Fe) metals. The extraction constants are calculated from the metal distribution data using linear regression analysis. The extracted species is MA_2 in each case. A most significant result is separation of copper(Ⅱ) from iron (Ⅲ) which otherwise interferes when extracted from the acidic medium.