Method for maintaining converter slag surface by using granular steel

Abstract

The invention relates to a method for maintaining a converter slag surface by using granular steel, and belongs to the technical field of ferrous metallurgy steelmaking. The method comprises the following steps: 1) measuring the height of the bottom of a converter and the distance between the center of a severely eroded part of the slag surface and a converter mouth by one heat in advance; 2) determining the loading position of the granular steel in a scrap steel bucket according to the erosion position of the converter slag surface, and loading all scrap steel into the scrap steel bucket forlater use; (3) conducting slag splashing operation after tapping is completed, and controlling the slag splashing gun position and nitrogen pressure according to certain parameters; (4) confirming that the slag fluidity meets the slag surface maintenance requirement after slag splashing is completed, rocking the converter to the horizontal position and stays for 5 seconds after steel scrap is added into the converter, and then conducting iron mixing operation; and 5) performing normal smelting by lowering the gun after the iron mixing operation is completed. According to the method, the granular steel is flatly laid on the surface of the slag in the loading process and bonded with the slag, the erosion resistance of the slag is improved in the smelting process, erosion to the converter slag surface in the smelting process is relieved, the operation safety of a converter body is improved, and the maintenance cost of the converter body is reduced.

Description

technical field [0001] The invention relates to a method for maintaining the slag surface of a converter by using granular steel, and belongs to the technical field of iron and steel metallurgy and steelmaking. Background technique [0002] The furnace body on the slag surface of the converter is subjected to the mechanical impact of adding iron and scrap steel, the chemical erosion of various reactions in the smelting process, and the slag pouring and molten steel erosion. The erosion speed is obviously faster than other parts. The thickness is generally less than 100mm, and the corrosion degree of the slag surface is more serious. The lining bricks of the multi-furnace furnace have been eroded, and there is a risk of steel breakout on the slag surface during the production process, which has a great impact on the safe operation of the furnace body and the smooth production. [0003] The existing slag splashing furnace protection technology usually adopts the method of addi...

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Problems solved by technology

[0002] The furnace body on the slag surface of the converter is subjected to the mechanical impact of adding iron and scrap steel, the chemical erosion of various reactions in the smelting process, and the slag pouring and molten steel erosion. The erosion speed is obviously faster than other parts. The thickness is generally less than 100mm, and the erosion degree of the slag surface is more serious. The lining bricks of the multi-furnace service iron filling position have been eroded, and there is a risk of steel breakout on the slag surface during the production process, which has a great impact on the safe operation of the furnace body and the smooth production.

[0004] However, the slag adjusting agent added in the above method is not a necessary raw material for converter smelting. The reason for adding it is that the slag before slag splashing cannot meet the normal slag splashing requirements or the quality of the slag is defective. Additional raw materials need to be added to adjust the slag, which increases the smelting cost.

And it needs to be added before converter slag splashing, which increases the smelting process

In addition, after using the above method for slag splashing, the effect of slag splashing on all parts of the furnace body is the same, and it is impossible to achieve key precise maintenance on the weak parts of the furnace body

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