Method for preventing swirling slag from metallurgical casting and device therefor

Abstract

The invention discloses a method for preventing vortex slag from metallurgical pouring and a device used for the method, comprising a metallurgical reactor and a pouring interface; the pouring interface includes an upper plate, a middle plate and a lower plate; the upper and lower plates are provided with through holes; The middle plate is provided with two through holes, one of which is provided with a stop piece; the lower surface of the upper plate is provided with an upper groove, and the upper surface of the lower plate is provided with a lower groove; the middle plate is located on the upper groove and the lower groove In the space; the middle plate can slide relative to the upper plate and the lower plate. The method of the present invention is different from the existing vortex flow control mode. During the tapping process of the metallurgical reactor, the tangential movement speed of the vortex flow of molten steel is eliminated by changing the internal structure of the tapping hole, thereby significantly reducing the critical height of the vortex. , prevent the upper layer of steel slag from being sucked into the downstream reactor, and control the amount of slag.

Description

technical field [0001] The invention belongs to the technical field of metallurgical pouring, and in particular relates to a method for preventing vortex slag from being generated in the pouring process of a metallurgical reactor and a device used for the method. Background technique [0002] With the continuous development of high-quality steel and special performance steel, more stringent requirements are put forward for the quality of molten steel in steelmaking, refining and pouring. During the pouring process of metallurgical reactors (such as converters, ladles and tundishes), due to the influence of the initial flow state of molten steel, vortex flow will occur in the middle and late stages of pouring. The slag layer is entrained into the downstream reactor, and the broken slag layer particles will cause different sizes, some of which will be removed by floating up, and some fine particles will remain in the molten steel because they are difficult to remove, forming n...

AI Technical Summary

Problems solved by technology

In 1984, U.S. Patent US4601415 introduced a pyramid-shaped molten steel eddy current suppressor, which is a polygonal cone made of refractory material with a specific gravity between molten steel and slag. There is a steel ball in the center of the cone to make it The fixed point of the cone is kept downward, and as the liquid steel level drops, the cone can gradually block the nozzle, prevent the generation of vortex flow and block slag, the disadvantage is that the specific gravity and center of the cone are not easy to accurately grasp, and the suppressor The processing industry is more complex

[0004] In general, in the existing technology, the sliding nozzle system has defects such as high cost, fixed installation position, converging vortex at the end of pouring, continuous pouring will cause secondary oxidation pollutants to rise, and other anti-rotation methods also have excessive excess steel. , negative measures to reduce the metal yield; therefore, it is necessary to develop a new device with simple design and easy implementation, which can effectively prevent the vortex, and the anti-swirl device has a long service life and has strong practical application value

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