Blowing and refining device and method used for removing tundish molten steel inclusion

Abstract

The invention discloses a blowing and refining device and method used for removing the tundish molten steel inclusion. The blowing and refining device is characterized by comprising a tundish 1, a blowing device 2 and a dipping cover 3, wherein the tundish comprises a permanent layer and a working layer arranged on the inner surface of the permanent layer; the bottom of the permanent layer is provided with the blowing device; the blowing device comprises an air brick and a ventilating pipe; the air brick comprises a dense layer and a ventilating layer; the middle of the ventilating layer is provided with an air chamber; and the dipping cover is a refractory material cover supported by a steel plate, is connected with an automatic lifting system and is arranged above the blowing device. According to the blowing and refining device, an air curtain retaining wall with a big air flow can be introduced in to form continuous and tight bubble columns, the average residence time of molten steel in the tundish is obviously prolonged, the molten steel flowing behavior is obviously improved, the molten steel can be stirred by a great quantity of tiny bubbles, inclusions with a smaller size can be adsorbed, and meanwhile, steel slag rolling and mixing and the secondary oxidation of the molten steel due to big blowing amount can be avoided.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy tundish continuous casting, and in particular provides a method and a device for improving the flow of molten steel in the tundish and protecting the molten steel from oxidation. Background technique [0002] The continuous casting tundish is the last refractory container before the molten steel solidifies. It has developed from the initial functions of diversion, continuous casting and decompression to a refining equipment with the functions of removing inclusions and heating. Therefore, the inclusions in molten steel should be removed to the greatest extent and foreign inclusions should be avoided as much as possible. Controlling the flow behavior of molten steel in the tundish is an important way to achieve effective removal of inclusions. [0003] A large number of studies have shown that traditional flow control devices can only effectively remove inclusions larger than 50 ...

AI Technical Summary

Problems solved by technology

In these methods, air-permeable bricks are installed at the bottom of the tundish, and air is blown into the air-permeable bricks to form an air curtain wall in the tundish. The ability of inclusions is limited, and if the air volume is increased, it will cause secondary oxidation of molten steel

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