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Automatic slag splashing control method and system for converter

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

Active Publication Date: 2021-06-18
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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  • Automatic slag splashing control method and system for converter

Examples

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 yield of residual manganese is greater than 30% and less than or equal to 40%, the state of the final slag is poor , for dilute slag.

[0038] 2) Add the slagging agent into the converter through the high-level silo. Specifically, add 400-500 kg of magnesia carbon balls to the converter first to play the role of deoxidation, and then add 800-500 kg of light-burned dolomite on both sides of the converter intersection 1000kg and raw dolomite 800~1000kg, so that the accumulation of slag adjustment material is more flat, and because the price of raw dolomite is relatively low, it can be used together with lightly burned dolomite, which can not only promote the rapid melting of lime, but also increase the alkalinity and viscosity of slag , reduce the erosion of slag to the lin...

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 yield of residual manganese is greater than 40% and less than or equal to 45%, the final slag is in good condition , is normal slag.

[0044] 2) Add the slag adjusting agent into the converter through the high-level silo. Since the viscosity of the slag is normal, the amount of slag adjusting material that needs to be added is less than that of thin furnace slag, and the purpose of slag adjusting can be achieved. Specifically, to the converter Add 0-300kg of magnesium carbon balls firstly, and then add 300-500kg of light-burned dolomite and 300-500kg of raw dolomite at the same time on both sides of the converter crossing.

[0045] 3) Since the final slag is normal, the amount of added slag adjustment material is less than that of dilute slag, and the low-high-low-low gun ...

Embodiment 3

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

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

[0051] 3) Since the final slag is relatively sticky, no slag adjustment material is added, and there is little slag splashing material in the furnace, and it can fully react without too much stirring, so choose the high-low-low gun position, and lower it step by step from high to low Slag splashing, specifically, the gun position is pressed down step by step from high to low from 1400mm, and then pressed down to 1200mm after 120 seconds, and then pressed down to the end gun position of 1000mm in about 170 seconds. The stirring in the furnace is appropriate, and the slag splashing part is the furnace ...

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Abstract

The invention discloses an automatic slag splashing control method and system for a converter, and belongs to the technical field of converter slag splashing furnace protection. The control method comprises the steps that firstly, final slag conditions are classified according to the end point oxygen content, the end point carbon content and the residual manganese yield range in molten steel; secondly, according to different final slag conditions, slag adjusting materials with the corresponding weights are selectively added into the converter to adjust the viscosity of the slag, and the content of magnesium oxide in the final slag is made to be 10%-15%; and thirdly, corresponding slag splashing gun position curves are selected according to different final slag conditions, and the control system is used for carrying out automatic slag splashing operation. The automatic slag splashing control method and system have the beneficial effects that the slag adjusting materials with corresponding weights are added according to the different final slag conditions for slag adjusting, the corresponding slag splashing gun positions are automatically selected, the automatic slag splashing operation is completed, and the slag splashing operation is standardized. The labor intensity of workers is lowered, the slag splashing time is shortened, the nitrogen consumption is reduced, and the furnace profile can be more stable to maintain.

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 Applications(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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