Process for extracting metals
AssigneeZeneca Limited
InventorsJohn Campbell, Raymond F. Dalton, Peter M. Quan
Life of this patent
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Abstract
A process for extracting metal values especially zinc values from aqueous solutions of metal salts which comprises contacting the aqueous solution with an organic phase comprising a compound of the formula: ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently, represents a substituted hydrocarbyl or hydrocarbyloxy group or R.sup.1 and R.sup.2 together with the attached phosphorus atom and/or R.sup.3 and R.sup.4 together with the attached phosphorus atom form a 5- to 8-membered heterocyclic ring.
Claims9
A process for extracting metal values from aqueous solutions of metal salts which comprises:
- (1) contacting the aqueous solution with an organic phase comprising an extractant compound of the formula:
- ##STR15## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently, is selected from the group consisting of an alkyl, a substituted alkyl, an alkoxy, a substituted alkoxy, an aryl, a substituted aryl, an aryloxy group, and a substituted aryloxy group, at least one of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 being an alkyl or alkoxy group containing from 1 to 20 carbon atoms, whereby to extract metal values into the organic phase in the form of a complex of the metal with the extractant;
- and
- (2) separating the organic phase containing the metal complex from the extracted aqueous phase.
Dependencies are inferred from the claim text.