Control method for vortex slag entrapment during converter tapping

A converter and eddy current technology, used in the manufacture of converters and other directions, can solve the problems of unsatisfactory slag blocking effect and high material consumption, and achieve the effect of reducing the amount of residual steel in the furnace, reducing the amount of slag entrained by eddy currents, and reducing the amount of slag.

Inactive Publication Date: 2016-06-29
ANGANG STEEL CO LTD
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Problems solved by technology

[0005] From the perspective of the development trend of slag blocking, due to the use of tangible slag blocking objec...

Method used

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  • Control method for vortex slag entrapment during converter tapping

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Embodiment 1

[0038] When smelting high-carbon steel in the converter, when the viscosity of the slag 1 in the furnace is relatively high, the shear force formed by the eddy current in the middle and late stages of tapping has a relatively small emulsification effect on the slag 1 at the steel slag interface. At this time, the continuous stirring mode can be used. And observe the fluctuation of the liquid level of the slag 1 above the tapping hole to properly adjust the power of the electromagnetic stirrer 4. The power adjustment range is 60-200kW, the frequency adjustment range is 12-15Hz, and the amount of slag lowered by the converter can be controlled at 60 ~80mm.

Embodiment 2

[0040] When low-carbon steel is smelted in a converter, when the viscosity of slag 1 in the furnace is relatively small, the shear force formed by the eddy current in the middle and late stages of tapping has a relatively large emulsification effect on slag 1 at the steel slag interface. At this time, it can be divided into two stages. Control: In the first stage, at the initial stage of vortex formation at the critical height, the continuous stirring mode is adopted, the power adjustment range is 80-200kW, and the frequency adjustment range is 10-12Hz; the second stage is below the critical height, in order to prevent the stirring force from being too strong For the emulsification of slag 1 at the steel slag interface, pulse stirring can be used. The pulse frequency is 0.5-4Hz and the power is 80-150kW, which can effectively suppress the eddy current and control the slag volume of the converter within 40-60mm.

Embodiment 3

[0042] When smelting ultra-low P steel, in order to more effectively suppress the slag from tapping, it can be controlled in three stages: the first stage is at the initial stage of vortex formation when it reaches the critical height, and adopts continuous stirring mode, and its power adjustment range is in 80 ~ 200kW, the frequency adjustment range is 10 ~ 12Hz; the second stage is below the critical height, in order to prevent the emulsification of the slag 1 on the steel slag interface by too strong stirring force, pulse stirring can be used, the pulse frequency is 0.5 ~ 4Hz, the power level 80~150kW; in the third stage, when the tapping is near the end, to prevent the adverse effect of the stirring force, the electromagnetic force stirring mode with alternating positive and negative directions can be used, and the alternating time of the positive and negative electromagnetic force is 0.5 ~ 2s. The power is 30-60kW, which can prevent the adverse effect of the electromagneti...

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Abstract

A control method for vortex slag entrainment in converter tapping. When the molten steel in the furnace reaches two-half and the slag on the liquid surface rotates, the electromagnetic stirrer around the tapping hole is started, and continuous and pulsed slag are adopted respectively according to specific conditions. Type and alternate stirring mode, the power adjustment range of the agitator is 30-200kW, the power frequency adjustment range is 5-10Hz, when the molten steel is about to be discharged, the taphole is blocked with a slag stopper. The invention can reduce the amount of slag in the converter, increase the alloy yield, reduce the burning loss of deoxidized aluminum, reduce the secondary oxidation of molten steel, improve the cleanliness and refining effect of molten steel, reduce the amount of modifier used, and shorten the treatment cycle , and reduce the amount of residual steel in the furnace, effectively prevent the occurrence of steel sticking when the oxygen lance is splashing slag to protect the furnace, and improve the service life of the oxygen lance.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a method for controlling eddy current slag entrainment in the steel tapping process of a converter. Background technique [0002] Eddy current slag entrainment will occur in the process of converter tapping, especially in the later stage of tapping as the molten steel level drops, converging eddy current will be generated, and it will become more and more intense, which will promote the emulsification of slag and steel, and make the slag enter the ladle with the steel flow, resulting in The slag layer in the ladle is too thick. In addition, the eddy current will also entrain a large amount of air, and enter the ladle with the molten steel. Since the alloying of molten steel in converter steelmaking is mostly carried out in the ladle, the slag formed by the vortex and the air involved enter the ladle and undergo oxidation reactions with the molten steel...

Claims

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Application Information

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IPC IPC(8): C21C5/30
Inventor 李德军廖相巍于赋志许孟春尚德礼栗红张宁吕春风康伟
Owner ANGANG STEEL CO LTD
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