Hydrometallurgical method of recovering zinc, copper and...

Details Hydrometallurgical method of recovering zinc, copper and... Hydrometallurgical method of recovering zinc, copper and...

C - Chemistry, Metallurgy

22

B

53/372

C22B 19/20 (2006.01)

Patent

CA 1217638

ABSTRACT OF THE DISCLOSURE A hydrometallurgical method of recovering zinc, copper and cadmium from their ferrites so that the ferrites are treated under atmospheric conditions in sulphuric acid bearing solution in the presence of potassium-, sodium- or ammonium-ions, is disclosed, in which the treatment takes place in one stage under such condi- tions that the non-ferrous metals, zinc, copper and cadmium, contained in the ferrites are transferred as sulfates to the solu- tion and the iron is converted in the same stage to a solid basic iron salt by adjusting the sulphuric acid or ferric sulphate addition to be equivalent with regard to the ferrite amount fed into this stage and by adjusting the temperature to 80 - 105°C, preferably to 95 - 105°C, and further by adjusting the sulphuric acid content so that the total reaction takes place sufficiently quickly and after that the solid material is separated from the solution by washing it well with water and the solution and the wash water are returned to the neutral leaching stage.

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