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:
Mar. 31, 1987
Filed:
Jun. 05, 1985
George P Demopoulos, Montreal, CA;
George Pouskouleli, Thessaloniki, GR;
Pierre J Prud'Homme, Hull, CA;
Canadian Patents and Development Limited, Ottawa, CA;
Abstract
The direct recovery of precious metals, particularly gold and the platinum group metals, from chloride solutions, is achieved by solvent extraction and selective stripping/precipitation. Substituted quinolines are used as active extractant, in particular alkyl substituted 8-hydroxyquinoline. Gold is precipitated either by hot water, or by hydrogen after a cold water wash. Palladium remains in the organic phase and is precipitated by more severe hydrogen reduction or is stripped with acid. Platinum (and other precious metals) is stripped into water (the aqueous precipitant or wash), and can be recovered by hydrogen reduction (in stages). The organic phase is not degraded providing acid is washed out before any hydrogen reduction, and can be recycled.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile