Patent ID: 7384594

Claim:
An injection device ( 1 ) for pyrometallurgical treatment of metals, metal melts, and or slags in a metallurgical installation or a melting vessel, in particular for blowing up or in oxygen-rich gases and/or carbon-containing material in an electric arc furnace, wherein the injection device accelerates oxygen-containing gases, ( 6 ) to a supersonic speed, with an ejected therefrom, high-velocity jet ( 6 ′) being protected by a gaseous envelope completely enveloping same for using the same for pyrometallurgical treatment, characterized by a modular construction of separate subassemblies consisting of an oxygen injector ( 10 ) with an inner wall ( 11 ) and a Laval nozzle ( 13 ) for accelerating an oxygen-rich gas ( 6 ), and a hot gas union ( 2 ) surrounding the oxygen injector ( 10 ) and an outlet region of which has an inwardly directed thickening ( 7 ) that forms, together with the oxygen injector ( 10 ), an annular nozzle slot ( 4 ) for passing and acceleration of a hot gas ( 5 ).