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A method for eliminating partial splashing phenomenon in the process of slag splashing and furnace protection

A technology of slag splashing to protect the furnace and phenomenon, which is applied to the improvement of process efficiency, manufacturing converters, etc. Increase the effect of mixing and reaction time

Active Publication Date: 2022-04-26
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, problems such as temperature drop and slag wrapping and agglomeration caused by the addition of raw dolomite are usually ignored, which will hinder and inhibit the kinetics of slag splashing in the furnace, which will lead to partial splashing and inhomogeneity of slag splashing , have a greater impact on furnace type maintenance and control

Method used

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  • A method for eliminating partial splashing phenomenon in the process of slag splashing and furnace protection
  • A method for eliminating partial splashing phenomenon in the process of slag splashing and furnace protection
  • A method for eliminating partial splashing phenomenon in the process of slag splashing and furnace protection

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Embodiment 1

[0039] A method of eliminating slag splashing in the process of protecting the furnace in this embodiment has been successfully tested in a 120-ton top-bottom combined blowing converter in a domestic steel factory. figure 2 As shown, in this embodiment, the specific content of eliminating the phenomenon of slag splashing in the process of protecting the furnace by controlling the drop area, addition amount, and addition timing of raw dolomite in the converter is as follows:

[0040] 105t of molten iron at a temperature of 1390°C was blended into the converter, and 25t of scrap steel was added at the same time. The composition of the molten iron was C: 4.84%, Si: 0.36%, Mn: 0.25%, and P: 106%.

[0041] When the smelting end point is reached, the gun is lifted to measure the temperature and take samples, and the measured data: the tapping temperature T is 1655°C, the end point C=0.08%, and the slag melting point t is 1619°C.

[0042] At this time, T-t=36°C>15°C, reaching the ti...

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Abstract

The invention discloses a method for eliminating the partial splash phenomenon in the process of slag splashing to protect a furnace, and belongs to the technical field of converter steelmaking. In the present invention, by analyzing the slag splash phenomenon caused by adding raw dolomite in the process of slag splashing to protect the furnace, the cause of the slag splash phenomenon and the harm caused by it are obtained. For dolomite, the converter steel tapping operation is carried out, and the slag splashing protection operation is carried out after the steel tapping is completed. Among them, the addition of raw dolomite is quantitatively controlled and the timing of its addition is optimized to reduce the uncertain factors due to the amount of addition. The heat has a greater impact, reducing the influence of slag crusting and clumping on the slag splashing protection furnace, and by controlling the falling area of ​​raw dolomite in the converter, the relationship between the particle size of raw dolomite and the included angle of entering the furnace can be obtained. Strictly control the particle size of raw dolomite entering the furnace, and eliminate the phenomenon of partial splashing, so as to achieve the purpose of efficient slag splashing.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to a method for eliminating slag splashing during furnace protection. Background technique [0002] At present, major steel mills generally use slag splashing to protect the furnace body to maintain the furnace body. The high-temperature terminal slag with relatively suitable alkalinity and magnesium oxide is used to make it evenly adhere to the surface of the furnace lining under the blowing and splashing of high-pressure nitrogen. , and well combined with the furnace lining to form a dense slag splash protection layer, thereby reducing the erosion of molten steel, slag and other factors during the blowing process, protecting the furnace lining and improving the life of the converter. In view of the current fast-paced steelmaking mode, most steel mills add raw dolomite during slag splashing to rapidly cool and solidify the slag, so as to shorten the slag splashing tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/44
CPCC21C5/443Y02P10/20
Inventor 邓勇韩宝范鼎东徐小伟邬琼周小宾兰海峰蒲雪峰
Owner MAANSHAN IRON & STEEL CO LTD
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