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:
Jan. 06, 2015
Filed:
Jun. 07, 2011
Applicants:
Erkki Paatero, Helsinki, FI;
Mika Haapalainen, Pori, FI;
Inventors:
Erkki Paatero, Helsinki, FI;
Mika Haapalainen, Pori, FI;
Assignee:
Outotec Oyj, Espoo, FI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C22B 3/00 (2006.01); C25C 1/20 (2006.01); C01G 7/00 (2006.01); C22B 3/26 (2006.01);
U.S. Cl.
CPC ...
C22B 11/04 (2013.01); C01G 7/00 (2013.01); C22B 3/0005 (2013.01); C22B 3/0009 (2013.01); C22B 11/042 (2013.01); C25C 1/20 (2013.01); C01P 2002/80 (2013.01); C01P 2004/03 (2013.01);
Abstract
The invention relates to a method for recovering gold by solvent extraction from an acidic chloride-containing aqueous solution or from slurry containing gold-bearing solids using a diester-based reagent that is poorly soluble in water as organic extraction solution. In accordance with the method, gold is extracted extremely effectively, but other precious metals and many other metals quite sparingly. Gold is stripped from the extraction phase with pure water, from which the gold can be reduced either chemically or electrochemically.