Device and method for reducing slag amount in tapping process of steelmaking converter

Abstract

The invention belongs to the technical field of converter smelting, and particularly provides a device for reducing the slag amount in the tapping process of a steelmaking converter. The device comprises a converter, a converter tapping hole and a gas source structure, wherein a converter lining is arranged on the inner wall of the converter, a magnesite brick permanent layer is adopted as the converter lining, and working layer bricks are built on the converter lining; and a refractory material pipe with thickness is arranged at the tapping hole, a plurality of uniformly distributed air inletslots are formed in the wall of the refractory material pipe, an annular air chamber is arranged at the bottom of the refractory material pipe, and the bottom ends of the plurality of air inlet slotsrespectively communicate with the annular air chamber. The device is simple in structure, convenient to operate and low in investment, vortex slag entrapment in the tapping process can be effectivelyinhibited, the slag amount in the tapping process of the steelmaking converter is reduced, molten steel rephosphorization can be reduced, the alloy yield is increased, inclusions in steel can be reduced, the molten steel cleanliness is improved, steel ladle slag adhesion can be reduced, the service life of a steel ladle is prolonged, and good conditions can be provided for molten steel refining,so that the quality of molten steel is improved.

Description

technical field [0001] The invention belongs to the technical field of converter smelting, and specifically provides a device and a method for reducing the amount of slag dropped during the tapping process of a steelmaking converter. Background technique [0002] The oxidative slag in the tapping process of the steelmaking converter has a great impact on the quality of molten steel. Effective slag blocking operation in the tapping process of the converter can not only reduce the return of phosphorus in molten steel, improve the yield of alloy, but also reduce the inclusions in steel , improve the cleanliness of molten steel, reduce sticky slag in the ladle, prolong the service life of the ladle, and provide good conditions for molten steel refining. In order to continuously improve the quality of molten steel and meet the increasing requirements of users for steel quality, reducing the amount of slag during tapping of converters has become an important means to improve the q...

AI Technical Summary

Problems solved by technology

The current slag blocking technologies mainly include slag blocking balls, slag blocking plugs, pneumatic slag blocking, sliding plate slag blocking, etc. The slag blocking balls and slag blocking plugs are attached to the slag-steel interface by virtue of their density being greater than the slag but smaller than the molten steel. When the molten steel is about to be tapped, the tap hole is blocked to prevent the slag from flowing out. This method can partially suppress the vortex slag formed during tapping in the converter, but this method requires appropriate density of the ball and plug. It is necessary to maintain the round shape, and the position of the ball should be aligned with the tap hole, otherwise it will easily float away from the tap hole with the steel flow and lose the slag blocking effect, and at the same time increase the cost of steelmaking; the pneumatic slag blocking is set outside the tap hole The high-pressure nozzle sprays high-pressure gas into the tapping hole to block the slag, which cannot suppress the swirl slag formed when the molten steel is tapped in the converter

Slider slag blocking uses the opening and closing of the sliding nozzle to realize slag blocking, but it cannot suppress vortex slag entrainment, and the device and equipment are complicated, and the operating cost is high

In short, the above several slag blocking technologies may partially suppress the vortex slag entanglement on the molten steel surface during tapping of the converter, or have no function of suppressing slag entrapment in the molten steel in the furnace, but all of them increase the cost of steelmaking

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