Selective solvent extraction using organophosphorus and carboxylic acids and a non-chelating aldehyde oxime
AssigneeCouncil for Mineral Technology
InventorJohn S. Preston
Life of this patent
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Abstract
A process for the extraction of metal values, in particular divalent metal ions such as copper, nickel, zinc, cobalt and manganese from aqueous solutions thereof which may be well in the acid range for example of pH 2 to 4. Extraction is effected using known organophosphorus or carboxylic acid extractants but in combination with non-chelating oximes, preferably of aldehydes wherein the alpha-carbon atom is primary or secondary. A synergistic effect between the extractant and oxime enables extraction to take place at a lower pH than heretofore thereby saving in acid and neutralizing agents in many instances.
Claims8
A process for the solvent extraction of nickel, selectively from cobalt from solutions containing such metals and having a pH of less than 5 comprising contacting said solution with a solvent extractant comprising an organophosphorus acid or a carboxylic acid capable of extracting the nickel and a non-chelating oxime of an aldehyde wherein the alpha carbon atom is primary or secondary.
A process for the solvent extraction of nickel selectively from cobalt from solutions containing such metals and having a pH of less than 4 comprising contacting said solution with a solvent extractant comprising an organophosphorus acid or a carboxylic acid capable of extracting the nickel and a non-chelating oxime of an aldehyde having the formula:
- ##STR3## wherein R is selected from the group consisting of C.sub.7 H.sub.15 ;
- C.sub.4 H.sub.9 CH(C.sub.2 H.sub.5);
- and C.sub.2 H.sub.5 CH(C.sub.2 H.sub.5).
Dependencies are inferred from the claim text.