Ladle breathable upper nozzle seat brick and method for controlling ladle slag

Abstract

A ladle venting nozzle seat brick and a method for controlling ladle slag removal. The device includes a ladle nozzle seat brick body, a vent plug, an air chamber box, a vent base, an air blowing pipe, a steel flow hole and a ladle mounting hole; Control method: 1) Place a ladle ventilation nozzle seat brick at the steel outlet at the bottom of the ladle, and connect the blowing pipe passing through the ladle ventilation nozzle seat brick with the gas pipeline; 2) When the height of the molten steel in the ladle: Ladle When the height = 1: (16~35), inert gas is blown into the inside of the molten steel through the blowing pipe, so that the molten steel surface forms a round convex area without a slag layer to inhibit slag from the ladle; 3) When slag appears in the ladle , close the ladle nozzle and stop blowing gas through the blowing pipe; the method of the present invention blows in argon at the end of pouring to form a "round convex area" without a slag layer on the molten steel surface, effectively suppressing the converging vortices and drainage sinkholes The resulting slagging in the ladle reduced the amount of molten steel pouring in the ladle by more than 35% year-on-year.

Description

technical field [0001] The invention belongs to the field of continuous casting of iron and steel, and in particular relates to a ladle breathable upper nozzle seat brick and a method for controlling ladle slag. Background technique [0002] The control of ladle slag in the continuous casting process has always been a common problem in the industry. At the end of pouring, the molten steel in the ladle produces slag due to reasons such as confluence vortex, drainage sinkhole, etc., resulting in increased inclusions and quality defects in the slab. Usually, the slag control system is used to control the slag, that is, the nozzle is closed immediately when the ladle is detected to be slag during the pouring process, but this will cause a large amount of molten steel in the ladle to be poured, and the metal yield will be reduced. [0003] Chinese patent document CN104028739A (Patent No.: 201410274221) discloses a ladle ventilating upper nozzle block and its method for controllin...

AI Technical Summary

Problems solved by technology

This patent has the following deficiencies: the diameter of the ceramic venting rod is too small, which is not conducive to gas circulation, and cannot effectively prevent the problem of vortex (vortex) slag entrainment; it does not consider the influence of the drainage sinkhole on the slag of the ladle, and cannot target the drainage sinkhole The slag is caused by the proposed control measures; the number of breathable ceramic rods is too large and the length is too long, the production cost of the nozzle block is high, and it is not suitable for industrial production

This patent has the following deficiencies: the structure of the annular breathable brick is not described in detail, the production cost of the breathable ring is high, and it is difficult to promote large-scale application in large-scale on-site production

This patent has the following deficiencies: the reconstruction of the bottom of the ladle requires a large amount of work, no effective blowing device for the bottom of the ladle is proposed, and the service life of the bottom blowing components is not considered; the impact of the drainage sinkhole on the slag of the ladle is not considered, No method for controlling slag in the drain sink hole; not effective enough to control slag in the ladle

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