Outokumpu Oy

Aimo E Jarvinen

Sigmund P Fugleberg

Jussi K Rastas

Kaarlo M Saari

Vaino V Hintikka

Jaakko O Leppinen

The invention relates to a method for recovering various valuable materials in connection with the hydrometallurgical production of zinc. The method is particularly suited for feeding different types of raw materials into the various stages of a process carried out in atmospheric conditions. Valuable materials such as lead, silver and gold are recovered by means of the said method.

Hydrometallurgic method for processing raw materials containing zinc

A process is disclosed for the recovery of lead, silver and gold from the iron-bearing residue of an electrolytic zinc process by froth-flotating a slurry of the iron-bearing residue in the presence of a sulfidic collector agent in order to froth-flotate the sulfides and to separate them from the iron-bearing residue. The iron-bearing residue is sulfidized selectively in order to convert the lead, silver and possibly gold substantially quantitatively to sulfides before the iron-bearing residue is froth-flotated.

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Kokkola, Finland

Aimo E Jarvinen