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. 02, 1999
Filed:
Jan. 17, 1997
Applicant:
Inventors:
Jean-Marc Lalancette, Sherbrooke, CA;
Hugues Menard, Sherbrooke, CA;
Regina Zamojska, Sherbrooke, CA;
Assignee:
UG Plus International Inc., Sherbrooke, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C25C / ; C25C / ; B01D / ; C01G / ;
U.S. Cl.
CPC ...
205560 ; 205568 ; 205571 ; 205574 ; 205583 ; 205584 ; 205602 ; 205604 ; 205607 ; 423 24 ; 423 27 ; 423 29 ; 423 99 ; 423109 ;
Abstract
Ores containing copper, zinc, silver in the form of sulfides are treated by a solution of sulfurated sulfite ions and ammonium ions in order to remove most of the metals from the sulfide ores. This treatment renders the resulting gold bearing ores much more amenable to cyanide extraction. Dissolved metals are reclaimed by appropriate techniques, such as electrowinning or liquid-liquid extraction, and the solution of sulfurated sulfites and ammonia is recycled for further lixiviation of fresh ores.