Method for deflection bottom tapping of revolving furnace

Abstract

The invention discloses a method used for tapping through deflecting the bottom of a convertor, which is characterized in that the tapping opening of the converter is designed at the lower part of the converter; the position at the upper end of the tapping opening is arranged below a molten liquid surface; the lower end is higher than the slag surface after tapping in the convertor only with the slag left by 10 to 20cm; the diameter of the tapping opening is between 10 and 20cm; when the smelting reaches the end point, the converter is deflected by 20 to 60 degrees; the rotated angle leads the position of the tapping opening to be arranged at the lowest side of the converter; then the tapping opening is opened, the molten steel flows into a ladle arranged below the tapping opening; after the molten steel flows out, the converter is resumed to the normal vertical position and the ladle is removed, then the liquid surface of slag is lower than the lowest position of the tapping opening of the converter; then the ladle is arranged below the converter and the converter is deflected to lead the opening of the converter to face the lower side; and then the slag is spilled out from the opening of the converter. The method used for tapping through deflecting the bottom of a convertor solves the problem of slag during the tapping of the converter, ensures the slag amount of the converter to be lower than 0.5kg / t. Not only the rephosphorization of the molten steel can be reduced and the alloy recycling rate is improved, but also the occluded foreignsubstance in the steel can be reduced and the cleanness of the molten steel can be improved. Besides, the refining time can be shortened and the desulfurization degree can be improved.

Description

Technical field: [0001] The invention belongs to the field of converter steelmaking, and in particular relates to a method for tapping steel from the bottom of the converter. Background technique: [0002] With the increasing requirements of users for steel quality, it is necessary to continuously improve the quality of molten steel. Reducing the amount of slag in converter tapping is an important aspect to improve the quality of molten steel. Effectively block slag when tapping the converter, reduce the amount of slag dropped by the converter, reduce the return of phosphorus in molten steel, and increase the yield of the alloy; reduce inclusions in the steel, improve the cleanliness of molten steel; reduce sticky slag in the ladle, and increase the life of the ladle ; It can also provide good conditions for molten steel refining. But for a long time, metallurgists and engineers and technicians have not been able to completely solve the problem of converter steel belt slag...

AI Technical Summary

Problems solved by technology

But for a long time, metallurgists and engineers and technicians have not been able to completely solve the problem of converter steel strip slag

Even B. Enkner et al. published "New VAI- The converter slag blocking system mentioned in the article VAI-CON converter slag blocking system developed by voestalpine can make the amount of slag carried during tapping less than 2kg / t, which can obviously improve the cleanliness of molten steel, but it still cannot avoid tapping When the molten slag enters the molten steel, it cannot solve the problem of stripping slag

Tapping slag not only affects the cleanliness of molten steel, but also leads to a high content of ∑FeO in the slag during refining, which affects the production of slag, which in turn affects the desulfurization performance of the slag, refining time, etc.

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