PROCESS FOR SEPARATING COPPER FROM AN ACID AQUEOUS SOLUTION

摘要

A process is described for the separation of copper values from an acidic aqueous solution thereof by liquid-liquid extraction with an extractant comprising an organic solvent and a dissolved hydroxy-oxime. The process utilizes a known hydroxy oxime of the general formula A- C(=NOH) - R, (I) in which R represents a hydrogen atom or an aliphatic group and A an aromatic group carrying as substituents a hydroxyl group at a ring carbon atom in a 2-position-the number 1 being assigned to the ring carbon atom to which the-C(=NOH)-R group is attached- and optionally an organic group D, and/or (2) a known 2-hydroxybenzophenone oxime substituted by a saturated or ethylenically unsaturated aliphatic group or groups or the corresponding ether group or groups in combination with (a) hydrocarbyl hydroxymethyl ketone oxime, (b) 2-hydroxyaldoxime in which the carbon atom carrying the hydroxyl group also carries two hydrocarbyl groups or one hydrocarbyl group and one hydrogen atom,(c) 2-hydroxycycloalkanone oxime in which the cycloaliphatic ring also carries one or more organic groups or aliphatic alpha-hydroxy-oxime of the general formula (II) in which R1, R2 and R3 each represent an organic group and R3 may also represent a hydrogen atom with the proviso that an aliphatic alpha-hydroxy-oxime of the general formula II is present only whenever a hydroxyoxime of the general formula I is also present. The process is particularly suitable for the separation of copper values from iron values.