C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/06 (2006.01) C22B 15/00 (2006.01)
Patent
CA 2530355
The invention relates to a method for processing sulfide ores containing precious metals, such as copper ores containing nickel. According to the method, the ore or concentrate (1) containing the precious metals is leached (2), and the iron contained in the solution is neutralized in oxidizing conditions by means of a ferrous recirculation solution (6) recirculated to the leach. The solution (8) from the leaching step and at least part of the solution residue is conducted to a conversion step (5), where iron bearing sulfide (9) is fed for turning the copper contained in the conversion step to copper sulfide concentrate (10) containing the precious metals. The solution (6) obtained from the conversion step is partly recirculated to the preceding leaching step (2) and partly conducted to the further treatment (11) of the components contained in the solution.
L'invention concerne un procédé de traitement de minerais de sulfure contenant des métaux précieux, tels que des minerais de cuivre contenant du nickel. Selon ledit procédé, le minerai ou le concentré (1) contenant les métaux précieux est lixivié (2) et le fer contenu dans la solution est neutralisé dans des conditions d'oxydation au moyen d'une solution de recyclage ferrique (6) recyclée vers la solution de lixiviation. La solution (8) provenant de l'étape de lixiviation et au moins une partie du résidu de la solution sont conduites vers une étape de conversion (5) au cours de laquelle du sulfure ferrugineux est additionné afin de transformer le cuivre de l'étape de conversion en concentré de sulfure de cuivre (10) contenant les métaux précieux. La solution (6) obtenue lors de l'étape de conversion est partiellement recyclée vers l'étape de lixiviation précédente (2) et partiellement conduite vers le traitement ultérieur (11) des composants contenus dans la solution.
Heimala Seppo
Ruonala Mikko
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Outokumpu Technology Oy
Outotec Oyj
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