Patent ID: 8101153
Filing Date: 2012-01-24
Classification: C22B,Y02P

Abstract:
1. A method for treating residues comprising zinc ferrites and non-ferrous metals selected from among the group made up of lead (Pb), silver (Ag), indium (In), germanium (Ge) and gallium (Ga) and mixtures thereof in the form of oxides and sulfates, comprising the following steps: a. roasting of the residues in an oxidising medium at elevated temperature in order to obtain a desulfurised residue, b. smelting of the desulfurised residue in a reducing environment, c. liquid phase extraction of carburised cast iron and slag from the smelted desulfurised residue, d. vapour phase extraction of the non-ferrous metals from the smelted desulfurised residue, followed by oxidation and recovery thereof in solid form.