C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 23/00 (2006.01) C22B 3/08 (2006.01) C22B 3/44 (2006.01) C22B 15/00 (2006.01)
Patent
CA 2728519
The invention relates to a method for leaching pyrometallurgically produced, copper-containing sulfidic nickel matte. The nickel matte is first fed to an atmospheric leach step from which is obtained a nickel-bearing solution and a copper- and nickel-bearing leach residue, wherein the weight ratio of copper to nickel is not more than about 1. This is followed by adding a copper--containing solid matter into the leach residue and conducting the leach residue to pressure leaching. After the pressure leaching, there can be obtained a leach residue, which consists of copper sulfide precipitate relatively pure as regards iron and which also contains the precious metals of nickel matte.
La présente invention concerne un procédé de lixiviation de matte de nickel sulfidique contenant du cuivre produite par traitement pyrométallurgique. La matte de nickel est dabord alimentée vers un étape de lixiviation atmosphérique à partir de laquelle on obtient une solution contenant du nickel et un lixiviat résiduel contenant du cuivre et du nickel, le rapport pondéral cuivre/nickel étant égal ou inférieur à 1. Ensuite, on ajoute une matière solide contenant du cuivre dans le lixiviat résiduel et on effectue une lixiviation sous pression du lixiviat résiduel. Suite à la lixiviation sous pression, on peut obtenir un lixiviat résiduel, qui consiste en un précipité de sulfure de cuivre relativement pur en fer et qui contient également les métaux précieux de la matte de nickel.
Kotukhov Sergey
Latva-Kokko Marko
Lindell Esa
Norilsk Nickel Finland Oy
Smart & Biggar
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