A method for lowering the bottom height of converter

Abstract

The invention provides a method for lowering the bottom height of a converter, comprising the following steps: (1) controlling the end point carbon of the converter molten steel below 0.06%, and controlling the end point slag TFe above 15%; (2) pouring out the Part of the slag; (3) Lower the position of the oxygen lance to a constant distance between the tip of the oxygen lance and the bottom of the furnace to 2100-2300mm, then open the oxygen, control the oxygen pressure between 0.90-0.96MPa, and control the oxygen-opening time at 50- 60s; (4) Turn off the oxygen and lift the gun; after confirming that there is no water leakage in the oxygen gun, pour out the slag from the furnace mouth. This method is easy to operate, with high efficiency and obvious effect on the treatment of the furnace bottom; it has little damage to the furnace lining molten pool, furnace cap and other parts; after the furnace bottom rises, the use of this method can reduce the furnace bottom to the normal range in time, not only makes the converter The process of smelting can be carried out stably; and it provides a guarantee for the bottom blowing effect of the converter.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking in the iron and steel metallurgy industry, in particular to a method for reducing the bottom height of a converter. Background technique [0002] In the actual situation of steelmaking production, it is found that most of the steel mills in the converter steelmaking production generally have the problem of rising the furnace bottom of the converter. Various methods are used by various steel factories to control the rising of the furnace bottom, but it cannot be avoided. After the bottom of the converter rises, if it cannot be controlled and eliminated in time, it will not only affect the entire smelting process, but may also cause various unsafe accidents. [0003] The main problems caused by the rise of the furnace bottom: (1) The furnace volume ratio becomes smaller, and the process splashes seriously, which is not conducive to the consumption of steel materials; (2) It is easy to ...

AI Technical Summary

Problems solved by technology

[0002] In the actual situation of steelmaking production, it is found that most of the steel mills in the converter steelmaking production generally have the problem of rising of the furnace bottom of the converter. Each steel mill adopts various methods to control the rise of the furnace bottom, but it cannot be avoided.

After the bottom of the converter rises, if it cannot be controlled and eliminated in time, it will not only affect the entire smelting process, but may also cause various unsafe accidents

[0003] The main problems caused by the rise of the furnace bottom: (1) The furnace volume ratio becomes smaller, and the process splashes seriously, which is not conducive to the consumption of steel materials; (2) It is easy to cause unsafe factors such as gun sticking and flue sticking; (3) Using The effect of bottom blowing becomes worse, which is not conducive to end point control, etc.

This method uses reserved molten steel in the furnace for treatment, which has the following defects: one is that the reserved amount of molten steel is difficult to grasp; The risk is increased; the third is that improper handling is easy to erode the molten pool

[0005] Chinese patent document CN201210087437.4 discloses a method for melting the furnace bottom by leaving slag in the converter, controlling the carbon content at the end point of the converter to be below 0.03% for melting the furnace bottom, but controlling the carbon at the end point within this range will have a certain impact on the quality of molten steel The second is that it will cause a certain amount of erosion to the parts below the molten pool

Images