Recovery of metals from sulphidic material

Details Recovery of metals from sulphidic material Recovery of metals from sulphidic material

C - Chemistry, Metallurgy

22

B

C22B 3/08 (2006.01) C22B 11/00 (2006.01) C22B 13/00 (2006.01) C22B 19/00 (2006.01) C22B 19/20 (2006.01)

Patent

CA 2160488

A process for recovering zinc and iron from zinc- and iron-containing sulphidic material, which also contains lead and silver, in which the sulphidic material is leached under oxidizing conditions in a two stage countercurrent pressure leach to produce a zinc-containing solution from which zinc can be recovered by conventional means such as electrowinning, followed by a reducing leach to produce a lead- and silver-bearing product containing substantially all of the lead and a substantial portion of the silver present in the zinc-containing sulphidic materials, and a high strength iron bearing solution having the iron in the ferrous state from which substantially pure, saleable or environmentally acceptable iron residue in the form of hematite which contains the majority of the soluble iron present in the zinc-containing sulphidic materials is produced.

Enter the French Abstract here.@F@Un procédé, qui permet de récupérer du zinc et du fer à partir d'un matériau sulfuré contenant du zinc et du fer ainsi que du plomb et de l'argent, consiste à lessiver ce matériau sulfuré, dans des conditions oxydantes, sous pression, à contre-courant et en deux étapes, pour produire une solution contenant du zinc dont on peut récupérer le zinc par des moyens classiques tels que l'extraction électrolytique. Il consiste ensuite en un lessivage réducteur fournissant un produit, comportant du plomb et de l'argent, qui contient pratiquement tout le plomb et une partie substantielle de l'argent présent dans ce matériau sulfuré contenant du zinc, et fournissant une solution à forte teneur en fer dont le fer est à l'état ferreux et à partir de laquelle on produit un résidu de fer pratiquement pur qui est commercialisable et acceptable pour l'environnement et prend la forme d'hématite contenant l'essentiel du fer soluble présent dans ce matériau sulfuré contenant du zinc. @R@

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