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US 4,382,872 AGranted
Metallurgical extractant system
AssigneeThe Dow Chemical Company
InventorRobert R. Grinstead
Life of this patent
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Abstract
An extractant system comprising (a) a high molecular weight alkylaromatic sulfonic acid and (b) a chelating amine having a pKa of from about 3 to about 9 in a solvent which is essentially immiscible with water, said system being useful for the selective extraction of desired metals, e.g., cobalt, nickel or copper ions from aqueous acidic ore leach liquors.
Claims9
An extractant system useful for the selective extraction of cobalt, copper or nickel metal values present in an aqueous acidic ore leach liquor containing more than one metal value, said extractant system comprising:
- (a) an alkylaromatic sulfonic acid having a molecular weight of at least about 400,
- (b) a chelating amine having a pKa in the range from about 3 to about 9 selected from the group consisting of picolylamines, oxazoles, benzoxazoles, pyridyl imidazoles and picolinic acid amides and esters, and
- a water-immiscible diluent for (a) and (b).
Dependencies are inferred from the claim text.