Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Reexamination Certificate
2004-08-31
2010-06-08
Wyszomierski, George (Department: 1793)
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
C075S714000, C423S022000, C423S027000
Reexamination Certificate
active
07731777
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.
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Järvinen Olli
Lindroos Leo
Virtanen Henri
Chernoff Vilhauer McClung & Stenzel LLP
Outotec Oyj
Shevin Mark L
Wyszomierski George
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