C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 19/00 (2006.01) C22B 3/06 (2006.01) C22B 3/26 (2006.01) C25C 1/16 (2006.01)
Patent
CA 2421722
A process for the recovery of zinc from a zinc sulphide ore or concentrate comprises the steps of subjecting the concentrate to pressure leaching with an acidic solution containing at least about 15 g/L iron in solution to produce a zinc solution and a solid leach residue containing iron. The zinc solution is subjected to zinc solvent extraction to produce a raffinate and a pregnant zinc solution. A method of removing iron from an iron bearing raffinate is also provided which comprises pressure leaching a zinc sulphide ore with the iron bearing raffinate to produce a solid leach residue containing iron and a zinc solution.
L'invention concerne un procédé servant à récupérer du zinc à partir d'un minerai ou d'un concentré de sulfate de zinc et selon lequel on soumet le concentré à une lixiviation sous pression avec une solution acide contenant au moins 15 g/l de fer en solution afin de produire une solution de zinc et un résidu de lixiviation solide contenant du fer. On soumet ensuite la solution de zinc à une extraction de zinc par solvant afin de produire un raffinat et une solution de zinc forte. L'invention concerne également un procédé servant à éliminer des ions d'un raffinat ferrifère et consistant à lixivier sous pression un minerai de sulfate de zinc avec le raffinat ferrifère afin de produire un résidu de lixiviation solide contenant du fer et une solution de zinc.
Borden Ladner Gervais Llp
Cominco Engineering Services Ltd.
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