Patent ID: 8282857

Claim:
A solvent extraction composition comprising: having a copper:iron transfer ratio between 34 and 1700 a) one or more orthohydroxyarylaldoximes and/or one or more orthohydroxyarylketoximes; b) one or more selectivity modifiers chosen from one or more phosphinic acid and/or phosphonic acid, and salts and esters thereof; c) one or more equilibrium modifiers selected from alkylphenols, alcohols, esters, ethers and polyethers, carbonates, ketones, nitriles, amides, carbamates, sulphoxides, and salts of amines and quaternary ammonium compounds; and d) a water immiscible organic solvent, wherein the selectivity modifier is present in a molar ratio of the o-hydroxyoxime from 0.001 to 0.05.