Method of extracting metal ions into organic solvents

摘要

Metal ions are extracted from aqueous solutions with pH value within the range of 3.5 to 8.5 into organic solvents using {alpha}-amino ketoximes and/or {alpha}-aminoaldehydes of the general formula III, in which Re1 and Re2 represent a hydrogen atom, methyl or ethyl, Re3 and Re4 denote a hydrogen atom or a hydrocarbon radical having 1 to 20 carbon atoms, whereby at least one of the Re3 and Re4 groups must be alkyl containing 5 and more carbon atoms. The metal ions are isolated back from the organic solutions by extraction into strong acid aqueous solutions with pH value lower than 2. The invented method is particularly suitable for isolation of copper, further for separation of copper and nickel and for isolation and refining of palladium.