A converter automatic slag splash control method and system

A control method and slag splashing technology, which is applied in the field of converter slag splashing protection, can solve the problems of affecting the production rhythm of steelmaking, increasing the amount of slag splashing nitrogen, unstable furnace maintenance, etc., to shorten the time of slag splashing, reduce erosion, The effect of saving nitrogen consumption

Active Publication Date: 2022-06-07
新余钢铁股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing converter slag splash protection is manually operated, and different people operate guns in completely different positions, and the slag splash time is also of different lengths. The maintenance of the furnace is unstable, and the slag splash time is long, which affects the production rhythm of steelmaking. , while increasing the amount of nitrogen consumed by slag splashing and increasing the cost of slag splashing

Method used

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  • A converter automatic slag splash control method and system
  • A converter automatic slag splash control method and system

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Experimental program
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Effect test

Embodiment 1

[0037] 1) When the end-point oxygen content in molten steel is greater than 500ppm and less than or equal to 900ppm, the end-point carbon content is greater than 0.02% and less than or equal to 0.06%, and the residual manganese yield is greater than 30% and less than or equal to 40%, the final slag state is poor , which is thin slag.

[0038] 2) Add the slag adjusting agent into the converter through the high-level silo. Specifically, 400-500kg of magnesium carbon balls are preferentially added to the converter to play the role of deoxidation. 1000kg and 800-1000kg of raw dolomite, make the accumulation of the slag more flat, and because the price of raw dolomite is low, it can not only promote the rapid melting of lime, but also improve the alkalinity and viscosity of the slag when used together with lightly burned dolomite. , reduce the erosion of slag on the furnace lining, improve the life of the furnace lining, and reduce the cost of slag conditioning materials.

[0039]...

Embodiment 2

[0043] 1) When the end-point oxygen content in molten steel is greater than 300ppm and less than or equal to 500ppm, the end-point carbon content is greater than 0.06% and less than or equal to 0.1%, and the residual manganese yield is greater than 40% and less than or equal to 45%, the final slag state is good , for the normal slag.

[0044] 2) Add the slag conditioning agent into the converter through the high-level silo. Since the viscosity of the slag is normal, the amount of the slag conditioning material that needs to be added is less than that of the thin slag, so that the purpose of slag conditioning can be achieved. Priority is given to adding 0-300kg of magnesia-carbon balls, and then adding 300-500kg of light-burned dolomite and 300-500kg of raw dolomite at the same time on both sides of the converter junction.

[0045] 3) Since the final slag is normal, the added amount of slag mixing material is less than that of the thin slag. Select the low-high-low-low gun posi...

Embodiment 3

[0049] 1) When the terminal oxygen content in molten steel is less than or equal to 300ppm, the terminal carbon content is more than 0.1%, and the residual manganese yield is more than 45% and less than or equal to 50%, the final slag state is relatively viscous and is a viscous slag.

[0050] 2) Since the slag is sticky, there is no need to add slag-adjusting material.

[0051] 3) Since the final slag is relatively sticky, no slag adjustment material is added, and there is very little slag splashing material in the furnace, and the reaction can be fully reacted without much stirring. Therefore, the high-low-low type gun position is selected, and the descending step is from high to low. Press the slag splashing, specifically, the gun position is pressed down from high to low from 1400mm step by step, after 120 seconds, it is pressed down to 1200mm, and it is pressed down to the end gun position of 1000mm in about 170 seconds. The stirring in the furnace is appropriate, and the ...

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Abstract

A converter automatic slag splash control method and system, belonging to the technical field of converter slag splash protection, wherein the control method includes 1) classifying the final slag status according to the end point oxygen content, end point carbon content and residual manganese yield range in molten steel ; 2) According to different final slag conditions, choose to add corresponding weight slag adjusting material to the converter to adjust the viscosity of the slag, so that the content of final slag magnesium oxide is 10% to 15%; 3) according to different final slag Select the corresponding slag splashing gun position curve according to the situation and use the above-mentioned control system to perform automatic slag splashing operation. The slag splashing gun position completes the automatic slag splashing operation, standardizes the slag splashing operation, reduces the labor intensity of workers, shortens the slag splashing time, saves the amount of nitrogen gas, and makes the maintenance of the furnace more stable.

Description

technical field [0001] The invention relates to the technical field of converter slag splash protection, in particular to a converter automatic slag splash control method and system. Background technique [0002] The basic principle of slag splashing furnace protection is to adjust the composition of the final slag after tapping the converter, and blow nitrogen gas into the slag through the oxygen lance, so that the slag splashes and adheres to the furnace lining to form a protective layer for the furnace lining, reducing the steelmaking process. Mechanical erosion and chemical erosion of the furnace lining, so as to achieve the purpose of protecting the furnace lining and improving the service life of the furnace. [0003] The operation steps of slag splashing to protect the furnace are: 1. Leave all or part of the slag after the molten steel is exhausted; 2. Observe the thickness of the slag and the temperature, decide whether to add slag adjusting agent, and observe the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/36
CPCC21C5/28C21C5/36Y02P10/20
Inventor 张邹华吴春红王炜王源宋细牙田陈陈连军许劲松黄有财钟检林李小文王勇袁青张强
Owner 新余钢铁股份有限公司
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