Method of processing sulphide copper- and/or sulphide copper-zinc concentrates

A method of processing sulphide copper- and/or sulphide copper-zinc concentrates comprises flash smelting of said concentrates and basic silicate fluxes in the presence of oxygen with the resultant formation of a dispersed mixture of highly basic molten slag containing copper and zinc oxides, metallic copper and white matte. The initial concentrates and silicate fluxes are taken in ratios permitting production of highly basic slag, whereupon copper and zinc oxides contained in the highly basic molten slag are reduced by means of a solid carbonaceous material with the resultant formation of a vapor-gas mixture containing vapors of zinc, metallic copper and depleted highly basic molten slag containing not more than 18 percent by weight of silicon dioxide. The resultant vapor-gas mixture is then subjected to oxidation with a view to producing and collecting zinc oxide.