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. 08, 2010
Filed:
Aug. 31, 2004
Applicants:
Leo Lindroos, Pori, FI;
Henri Virtanen, Pori, FI;
Olli Järvinen, Espoo, FI;
Inventors:
Assignee:
Outotec Oyj, Espoo, FI;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C22B 7/00 (2006.01); C22B 15/00 (2006.01); C22B 1/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a hydrometallurgical method for separating the precious metals and impurities of anode sludge obtained from copper electrolysis. According to the method, anode sludge copper is separated in atmospheric leaching; calcinated in two steps for separating selenium and for sulfatizing silver; the sulfatized silver is separated by leaching into a neutral aqueous solution, from which it can be separated by reduction or by extraction.