| 摘要 |
<p>A process for the solvent extraction of metals, particularly copper, from aqueous ammoniacal solutions is provided. The extractant is an orthohydroxyarylketoxime of Formula (1), wherein R1 is a hydrocarbyl group, and R2 is an ortho-hydroxyaryl group and the extraction process is carried out in the presence of a kinetic modifier. Suitable thermodynamic modifiers which can be employed include alkylphenols, alcohols, esters, ethers and polyethers, carbonates, ketones, nitriles, amides, carbamates, sulphoxides, and salts of amines and quaternary ammonium compounds. Preferred orthohydroxyarylketoximes are 5-(C¿9? to C14 alkyl)-2-hydroxyacetophenone oximes. Preferred modifiers are highly-branched alkyl esters comprising from 10 to 30 carbon atoms, or highly-branched alkanols comprising from 14 to 30 carbon atoms, or trialkyl phosphates wherein the alkyl groups comprise from 4 to 14 carbon atoms. Extractant compositions comprising a ketoxime and modifier are also provided.</p> |
