The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 1991
Filed:
Jun. 12, 1990
Bryn G Harris, Beaconsfield, CA;
Serge Monette, Longueuil, CA;
Jean-Pierre Barry, Montreal, CA;
Robert Stanley, Kirkland, CA;
Noranda Inc., Toronto, CA;
Abstract
A process for recovery of platinum and palladium from an impure substantially gold-free precious and base metal-bearing acidic chloride or mixed chloride/sulphate solution comprises the steps of: contacting the acidic solution having a pH less than about 1.5 with an organic solution comprising an 8-hydroxy quinoline solvent extraction reagent, a phase modifier and an aromatic diluent to extract simultaneously platinum and palladium into the organic solution; scrubbing the loaded organic solution to remove co-extracted impurities and acid; stripping the loaded organic with a buffer solution operating in the pH range 2-5 at 20.degree.-50.degree. C. to selectively recover the platinum; stripping the platinum-free loaded organic with 3-8 M hydrochloric acid to recover the palladium; and regenerating the organic solution by washing with water.