Process for the extraction of metals from ammoniacal solution

Details Process for the extraction of metals from ammoniacal solution Process for the extraction of metals from ammoniacal solution

C - Chemistry, Metallurgy

22

B

C22B 15/00 (2006.01) C22B 3/26 (2006.01) C22B 3/30 (2006.01) C22B 19/00 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2302353

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-(C9 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.

L'invention concerne un processus pour l'extraction par solvants des métaux, en particulier le cuivre, à partir de solutions ammoniacales aqueuses. Le solvant d'extraction est une orthohydroxyarylcétoxime de formule (1). Dans ladite formule, R?1¿ est un groupe hydrocarbyle, et R?2¿ est un groupe ortho-hydroxyaryle, et le processus d'extraction est conduit en présence d'un modificateur cinétique. Les modificateurs thermodynamiques appropriés qui peuvent être utilisés sont les suivants : alkylphénols, alcools, esters, éthers et polyéthers, carbonates, cétones, nitriles, amides, carbamates, sulphoxydes, et sels d'amines et composés d'ammonium quaternaire. Les orthohydroxyarylcétoximes préférées sont les 5-(alkyle C¿9-14?)-2-hydroxyacétophénone oximes. Les modificateurs préférés sont les suivants : esters d'alkyle fortement ramifiés comprenant entre 10 et 30 atomes de carbone, ou alcanols fortement ramifiés comprenant entre 14 et 30 atomes de carbone, ou trialkylphosphates dont les groupes alkyle comprennent entre 4 et 14 atomes de carbone. L'invention concerne également des compositions d'extraction renfermant une cétoxime et un modificateur.

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