MODIFICATION OF COPPER / IRON SELECTIVITY IN COPPER EXTRACTION SYSTEMS WITH SOLVENT OXYME-BASED

摘要

1. A solvent extraction composition comprising one or more orthohydroxyaryl aldoximes and / or one or more orthohydroxyaryl ketoximes, one or more selectivity modifiers, consisting of phosphinic and / or phosphonic acids, their salts and esters and, optionally, one or more equilibrium modifiers, in which the molar ratio of the selectivity modifier to o-hydroxyoxyme is from about 0.001 to 0.04. ! 2. The solvent extraction composition according to claim 1, wherein the selectivity modifier is selected from the group of phosphinic acids or their salts or esters of the formula R4R5P (O) OR6, where R4 represents H, a C1-C20 alkyl, aryl or arylalkyl group, R5 represents H, C1-C20 alkyl, aryl or arylalkyl group, and R6 represents H, metal cation or NR74, where R7 represents H, C1-C20 alkyl, aryl or arylalkyl group, or phosphonic acids or their salts or esters formula R8R9OP (O) OR10, where R8 represents is H, a C1-C20 alkyl, aryl or arylalkyl group, R9 is H, a C1-C20 alkyl, aryl or arylalkyl group, and R10 is H, a metal cation, or NR74, where R7 is H, C1-C20 alkyl , an aryl or arylalkyl group. ! 3. The solvent extraction composition of claim 2, wherein the selectivity modifier is selected from the group consisting of bis (2,4,4-trimethyl) phosphinic acid, bis (2-ethylhexyl) phosphinic acid, bis (2-ethylhexyl) phosphonic acid phenylphosphonic acid or salts thereof; and 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester. ! 4. Composition for extracting a solution