Method for the pyrometallurgical treatment of metals, metal melts and/or slags and injection device
AssigneeSMS Demag AG
InventorsMatthias Meyn, Peter Monheim, Reinhard Scholz
Life of this patent
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Abstract
In the metallurgical treatment of metals, metal melts and/or slags in a metallurgical unit or melting vessel, especially in electric arc furnaces, injection devices (1) are used for blowing in or up oxygen-rich gases (6) and/or carbonaceous substances, which cause as long as possible gas jet (6′) with a high pulse energy to strike to strike the surface of the slag or metal. It is known to envelope produced gas jet (6′), thereby focusing it. According to the invention, such an envelope is obtained by using a hot gas (5, 5′) that is preaccelerated to such a degree that the central gas jet (6′) is preferably without pulse losses.
Claims8
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).
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), which is surrounded by a hot gas union (2) an outlet region of which defines an annular nozzle slot (4) for passing and acceleration of a hot gas (5) and in an entrance region of which, water spray means is arranged.
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), which is surrounded by a hot gas union (2) an outlet region of which defines an annular nozzle slot (4) for passing and acceleration of a hot gas (5), and
- characterized in that
- within the central oxygen injector (10), an additive injector in form of an additional coaxial tube with an outlet opening (16), which is formed as a mouth or nozzle, is arranged,
- the additive injector (15) being axially displaceable and positioned with its outlet plane (B) between planes (E1) and (E2) of an oxygen injector (10).
Dependencies are inferred from the claim text.