Patent EA-004341-B1 (EA)
Title: Method and device for preventing slag from flowing along when tapping a molten metal
Inventor: SIEK HORST
IPC: F27D1/16
Filed: 2002-03-27
Abstract: 1. Method for preventing slag from flowing along when tapping a molten metal out of a metallurgical vessel, characterized by the process steps: a) pivoting the vessel (1) into the tapping position; b) blowing gas through the channels (11) that surround the tap opening (4), counter to the flow direction of the liquid metal, when tapping the melt located in the vessel (1); c) opening the tap opening (4); d) pivoting the vessel (1) back, until the tap opening (4) is no longer covered by the melt; e) ending the blowing in of gas. 2. Device for implementing the method according to claim 1 at a metallurgical vessel, wherein the tap opening is formed by interchangeable pipes formed of wear-resistant refractory material, arranged on top of one another, which are enclosed by tap framing blocks, whereby the lower end of the tap interchangeable system formed in this way is formed by a cup block, against which a slide that closes off the opening rests, characterized in that axially extending channels (11) that are open at both ends of the pipe (7') are provided in the pipe wall of at least the interchangeable pipe (7') that opens into the interior of the vessel, which channels are connected with a gas supply (13) at the pipe end facing away from the interior of the vessel. 3. Device according to claim 2, characterized in that the interchangeable pipe/pipes (7') in whose wall/walls the gas-carrying channels (11) are arranged, is/are surrounded by a sheet-metal mantle of stainless steel. 4. Device according to claim 2 or 3, characterized in that the channels (11) are radially arranged slits that surround the pipe opening. 5. Device according to claim 2 or 3, characterized in that the channels (11) are uniformly distributed bores that surround the pipe opening. 6. Device according to claim 2 or 3, characterized in that the channels (11) are formed by the interstice that occurs when the interchangeable pipe (7') is composed of a conically structured inside pipe (14) and an outside pipe (15) structured to be complementary to it, and when channel-forming grooves are provided either in the outside surface of the inside cone (14) or in the inside surface of the outside cone (15). 7. Device according to one of claims 2 to 6, characterized in that the gas supply (13) to the interchangeable pipe/pipes that have the channels opens into an annular chamber (12) that is arranged below the lowest channel-carrying interchangeable pipe and impacts all the channels. 8. Device according to claim 7, characterized in that the gas supply (13) consists of a pipe that opens above the cup block (10) into the join (9) between the interchangeable pipes (7) and the tap framing blocks (8), and is guided axially from there to the annular chamber (12). 9. Device according to one of claims 2 to 8, characterized in that the interchangeable pipes (7') that have the channels (11) form a unit. 10. Device according to one of claims 2 to 9, characterized in that the metallic sheath of the metallurgical vessel lies at the same electrical potential as the gas supply pipes. 11. Device according to one of claims 2 to 9, characterized in that the gas supply pipes are insulated with regard to the potential that lies at the metallurgical vessel.