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:
Jun. 09, 2015
Filed:
Mar. 13, 2012
Jean-marc Lalancette, Sherbrooke, CA;
Bertrand Dubreuil, Trois-Rivieres, CA;
David Lemieux, Thetford Mines, CA;
Jean-Marc Lalancette, Sherbrooke, CA;
Bertrand Dubreuil, Trois-Rivieres, CA;
David Lemieux, Thetford Mines, CA;
DUNDEE, TECHNOLOGIES DURABLES INC., Montreal, CA;
Abstract
The invention relates to a method for the extraction of precious metals, using halogens. It has been found that introducing halogens in the reactor in the form of hypohalites rather than free halogens simplified greatly the recycling of halogens by electrolysis. It increases the rate of addition of the halogens and significantly reduces secondary reactions with base metals such as iron. Operating under acidic conditions, the gold recovery has been found as high with hypochlorite as with elemental chlorine, with an active chlorine to ore ratio reduced by a factor of two to five.