Roasting non-ferrous concentrates etc. - in cyclone furnace followed by chambers removing molten metal and valuable oxide dust to produce high yields

摘要

The raw material (a) is fed into a cyclone furnace provided with a tangential inlet for fuel and air which create turbulence driving molten material and the prods. of combustion up a duct into a distribution chamber (b). The cyclone furnace pref. has a closed base. Chamber (b) pref. functions as a decantation furnace, or is connected to a decantation furnace for removing molten metal obtd. from materials (a) which are e.g. ores, slags, concentrates, ash and/or other intermediate prods. from which molten metal is to be recovered. Used e.g. in treating tin concentrates to obtain an increased yield of tin; or in treating Cu-Sb concentrates, where the yield of Sb in the oxide dust was 43.2%, leaving 4.4% Sb in the slag when a conventional process was used. The invention resulted in 47.4% Sb recovered in the oxide dust and only 0.9% Sb in the slag.