C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/12 (2006.01) C22B 3/10 (2006.01) C22B 15/00 (2006.01)
Patent
CA 2431466
This invention relates to a method where sulfidic iron-bearing copper concentrate is leached on the countercurrent principle, in a chloride environment. The leaching takes place with the aid of bivalent copper and an oxygen-bearing gas as a multistage continuous process, under normal pressure, at a temperature, which as highest corresponds to the boiling point of the solution. Part of the insoluble solid matter is returned, counter to the main flow of solid matter, to one of the previous leaching stages or reactors where, as a result of the extended leaching time, the leach waste iron is recovered mostly as hematite.
L'invention concerne un procédé selon lequel un concentré sulfuré ferrugineux de cuivre est lixivié selon le principe du contre-courant dans un environnement de chlorure. La lixiviation s'effectue à l'aide de cuivre bivalent et d'un gaz oxygéné comme processus continu multiétage, à une pression normale et à une température qui correspond au maximum au point d'ébullition de la solution. Une partie de la matière solide insoluble est renvoyée, dans une direction opposée à celle du flux principal de matière solide, à un des étages ou des réacteurs de lixiviation où, suite au temps de lixiviation prolongé, le fer résiduel de lixiviation est récupéré principalement en tant qu'hématite.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Outokumpu Oyj
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