Method for restraining rotational flow of roughing slag in steel ladle during steel releasing of steel ladle

Abstract

The invention belongs to the technical field of metallurgy and particularly relates to the technology of restraining of rotational flow in a steel ladle. A method for restraining the rotational flow is provided for avoiding the rotational flow generated during steel releasing of the steel ladle, reducing roughing slag quantity, shortening roughing slag height and improving molten steel use rate. The method includes that density measuring is conducted on protective slag and contained molten steel in the steel ladle, a density range of a rotational flow restraining device is determined, and a rotational flow restraining device body is manufactured by selecting appropriate materials. According to the actual size of the steel ladle and the actual size of a steel releasing port, relevant size of a pyramid-shaped rotational flow restraining device is designed and includes taper angles and taper height. The rotational flow restraining device meeting the requirements of buoyancy force and gravity is designed so that half of the rotational flow restraining device is soaked in a liquid slag layer, half of the rotational flow restraining device is soaked in the molten steel, a purpose that a flow field at the position of a scrap steel interface is disturbed, rotational flow can not be developed fully at the scrap steel interface, and the roughing slag quantity is reduced is achieved. The restraining device should meet the requirement that when the rotational flow restraining device is put in the steel releasing port, the steel releasing port can not be plugged, and the rotational flow restraining device is resistant to corrosion of the slag and the molten steel.

Description

technical field [0001] The invention belongs to the technical field of metallurgical smelting and rolling, and in particular relates to the technology of controlling inclusions in the continuous casting process. Background technique [0002] The external manifestation of the swirling flow when the ladle puts steel is to generate a vortex near the ladle nozzle. The generation of the vortex in the ladle is generally related to two factors (without considering the influence of the flow control device): 1) the conservation of angular momentum; 2) the Coriolis force. [0003] Oxygen blowing process, transfer process, KR stirring process and other technological processes in the smelting process will cause the molten steel in the ladle to shake or stir, which will cause the accumulation of angular momentum in the ladle. Considering that the steelmaking process takes a short time (generally 2 to 5 hours), and according to the research of foreign scholars, the internal angular mome...

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Problems solved by technology

[0011] The purpose of this invention is to overcome the swirling slag generated in the process of putting steel into the ladle, which affects the purity of molten steel in the tundish, and further deteriorates the internal quality of the continuous casting slab (mainly reflected Insufficient large inclusions increase in the continuous casting slab)

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