Henkel Kommanditgesellschaft Auf Aktien

Henkel Corporation

Mineral & Chemical Resource Co.

General Mills Chemicals Co.

Robert B Sudderth

Stephen M Olafson

Werner Schwab

Ralf Kehl

Archibald W Fletcher

Gary A Korkosky

Jay B Clitheroe

A process for recovery of metal values from a mixed metal chloride containing leach solution by contacting the leach solution with a water immiscible solution of a complexing agent selective for the neutral chloride of the metal to be recovered and a chelating agent having affinity for the cation of the metal to be recovered. The chloride ion is washed from the water immiscible solution by contact with a chloride ion washing solution. The water immiscible solution containing the chelated metal ion is stripped with an aqueous stripping solution. The metal is recovered from the aqueous stripping solution.

Process for recovering a metal from an aqueous solution comprising a

Prior art processes for removal of one or more contaminant elements, including at least one of antimony, bismuth, and arsenic and optionally including iron, from electrolyte solutions of primary metals by solvent extraction with an organic phase including a hydroxamic acid, then precipitating at least part of the contaminant elements from the organic phase as sulfides, are improved by an additional step of re-extracting the organic phase with water before precipitating the sulfides from it. At least part of any arsenic present and, if desired, part of any antimony as well, may be re-extracted in this manner and subsequently recovered if desired, so that the overall process is made more economical.

Process for selective extraction of contaminant elements from mixtures

Zinc values are leached or converted in a solution containing excess SO.sub.2 or HSO.sub.3.sup.- ions, selectively extracted from that solution into an organic phase containing organo acid phosphates and stripped from the organic phase for further processing.

Solvent extraction of zinc from sulfite-bisulfite solution

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Tucson, AZ, United States of America

Robert B Sudderth