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:
Apr. 02, 2002
Filed:
Jun. 05, 2000
Applicant:
Inventors:
David John Robinson, Gauteng, ZA;
Natalie Jean Shackleton, Gauteng, ZA;
Assignee:
Anglo American Platinum Limited, Johannesburg, ZA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22B 3/24 ;
U.S. Cl.
CPC ...
C22B 3/24 ;
Abstract
A hydrochloric acid solution containing platinum group metals has its acidity adjusted to 5.5 to 6.5M HCl and its redox potential adjusted to at least 500 mV, before being treated by chromatography. Particularly clean separation of at least Pt and Pd can be obtained, and recovered Pt and Pd of at least 99.99% purity may be obtained by following conventional precipitation processes.