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Method for eliminating partial splashing phenomenon in slag splashing furnace protection process

A slag splashing technology to protect the furnace and phenomenon, which is applied to the improvement of process efficiency and the manufacture of converters, etc., can solve the problems of furnace type maintenance and control influence, partial splashing, slag splashing non-uniformity, etc., to increase mixing and reaction the effect of time

Active Publication Date: 2021-06-29
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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  • Method for eliminating partial splashing phenomenon in slag splashing furnace protection process
  • Method for eliminating partial splashing phenomenon in slag splashing furnace protection process
  • Method for eliminating partial splashing phenomenon in slag splashing furnace protection process

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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 a partial splashing phenomenon in the slag splashing furnace protection process, and belongs to the technical field of converter steelmaking. According to the method, by analyzing the partial splashing phenomenon generated in the slag splashing furnace protection process when raw dolomite is added, the reason for generating the partial splashing phenomenon and the harm caused by the partial splashing phenomenon are obtained, when converter smelting reaches the end point, temperature measurement and sampling are conducted, the raw dolomite is added, converter tapping operation is conducted, and slag splashing furnace protection operation is conducted after tapping is completed, wherein quantitative control is carried out on the adding of the raw dolomite, and the adding time of the raw dolomite is optimized, so that the large influence on the superheat degree of slag due to the uncertain factors of the adding amount is reduced, and the influence on slag splashing furnace protection due to slag crusting and lumping is reduced; and in addition, a falling point area of the raw dolomite in a converter is controlled, so that the relationship between the particle size of the raw dolomite and the furnace entering included angle is obtained, the furnace entering particle size of the raw dolomite is strictly controlled, the partial splashing phenomenon is eliminated, and the purpose of efficiently splashing the slag is achieved.

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 Applications(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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