C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/226, 53/288
C22B 11/08 (2006.01) C01G 3/12 (2006.01) C01G 5/00 (2006.01) C01G 7/00 (2006.01) C22B 15/00 (2006.01)
Patent
CA 1225241
ABSTRACT OF THE DISCLOSURE: A process is described by which copper and optionally silver and gold are recovered from sulfide and oxide ores, concentrates or slag, which contain the metals. The particulate materials are treated with an aqueous so- lution of an alkali cyanide or alkaline earth cyanide, the laden solution is filtered, if desired, a water-soluble sulfide compound is added to the laden solution or filtered laden solution, the laden solution is subsequently adjusted to a pH value below 5 by an addition of acid to precipitate the metal sulfide, which is filtered off, and the resulting hydrocyanic acid is recovered. The process steps of precipitation and filtration of the metal sulfide and the recovery of the free hydrocyanic acid contained in the filtrate are caried out under superatmospheric pressure of 1.5 to 15 bars. The precipitation is preferably effected at a pH value of 1.5 to 2Ø The free hydrocyanic acid is recovered as alkali cyanide or alkaline earth cyanide and is recirculated to the leaching stage.
461792
Bergmann Arthur
Haidlen Ulrich
Potter George M.
Mnr Reprocessing Inc.
Robic Robic & Associes/associates
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