Abstract
The solvent extraction of nickel from acidic solutions by pyridinecarboxylate esters (2-, 3- and 4-C 5 H 4 N.CO.OR) mixed with organophosphorus acids (R 2 POOH, (RO)RPOOH and (RO) 2 POOH) in toluene was investigated for both series of compounds in which R = n-octyl, 2-ethylhexyl and cyclooctyl. Substantial synergistic effects were observed, which increased in the orders : pyridine 2-ester Ni > Zn > Co > Ca > Mg. In a batch countercurrent experiment, a simulated leach liquor containing Ni 2.1, Cu 0.5, Ca 0.4 and Mg 5.0 g dm -3 (initial pH 3.00) was extracted with the mixed reagent (0.50 M) in four stages at unit phase ratio, without pH adjustment.
Published Version
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