Converter bottom lance slag splashing method

A technology of slag splashing and converter, applied in the direction of manufacturing converters, etc., can solve the problems of long slag splashing time, high consumption of slag conditioning agent, poor slag splashing effect, etc., so as to improve the life of oxygen lance, ensure the effect of re-blowing, and improve production. The effect of efficiency

Pending Publication Date: 2022-07-22
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above technical problems, the present invention provides a slag splashing method of the converter bottom gun, which can overcome the defects of high slag adjustment agent consumption, long slag splashing time and poor slag splashing effect of the existing slag splashing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment is applied to a 270-ton bottom-blowing oxygen and bottom-spraying converter, and the bottom gun slag splashing method specifically includes the following steps:

[0035] Converter smelting heat number 20300320, steel grade IF steel, argon stirring for 1min after the end of blowing, TSO probe measurement T=1674℃, [O]=738pmm. At the end of tapping, adjust the nitrogen flow rate of the center pipe of the ring-slit bottom gun to 14100Nm 3 / h, the nitrogen flow rate of the annular slit pipe is 1269Nm 3 / h. Pour out 1 / 2 of the molten slag into the large-faced shaking furnace, shake the furnace body upright, and add 886kg and 986kg of raw dolomite from both sides of the top bin. Shake the furnace at 30°, splash slag on the large furnace wall and furnace cap, and then shake the furnace to -45° on the small surface after 1min, splash slag on the furnace wall and furnace cap on the small surface, and then finish the slag splashing for 1min, and then pour the sla...

Embodiment 2

[0037] This embodiment is applied to a 270-ton bottom-blowing oxygen and bottom-spraying converter, and the bottom gun slag splashing method specifically includes the following steps:

[0038] Converter smelting heat number 20300322, steel grade IF steel, argon stirring for 50 seconds after the end of blowing, TSO probe measurement T=1665℃, [O]=438pmm. At the end of tapping, adjust the nitrogen flow rate of the center pipe of the ring-slit bottom gun to 15000Nm 3 / h, the nitrogen flow rate of the annular slit pipe is 1350Nm 3 / h. Pour out 1 / 3 of the molten slag into the large-surface shaking furnace, shake the furnace body upright, and add raw dolomite in two batches from both sides of the top bin: the first batch is 312kg on one side and the other side is 318kg; the second batch is 474kg on one side , 483kg on the other side. After 1 minute, after flaky slag splashes at the furnace mouth, shake the furnace at 30° to the large surface to splash slag on the large surface furn...

Embodiment 3

[0040] This embodiment is applied to a 270-ton bottom-blowing oxygen and bottom-spraying converter, and the bottom gun slag splashing method specifically includes the following steps:

[0041] Converter smelting heat number 20300879, steel grade HC260LA, argon stirring for 40 seconds at the end of blowing, TSO probe measurement T=1648℃, [O]=528pmm. At the end of tapping, adjust the nitrogen flow rate of the center tube of the ring seam bottom gun to 4860Nm 3 / h, the nitrogen flow rate of the annular slit pipe is 486Nm 3 / h. Pour out 1 / 3 of the molten slag into the large-faced shaking furnace, shake the furnace body upright, and add raw dolomite in two batches from both sides of the top bin: the first batch is 294kg on one side and 306kg on the other side; the second batch is 454kg on one side , 363kg on the other side. After 1min, after flaky slag splashes at the furnace mouth, shake the furnace at 40° to the large surface, splash the slag on the large surface furnace wall ...

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Abstract

The invention discloses a converter bottom lance slag splashing method and belongs to the technical field of steelmaking. The method comprises the following steps: (1) after blowing of a bottom oxygen blowing and bottom powder spraying converter is finished, measuring the oxygen activity of molten steel at the end point of the converter through inert gas stirring, then tapping, adjusting the flow of bottom blowing nitrogen after tapping is finished, carrying out deslagging operation according to a measurement result, and shaking the converter to be straight; (2) adding the slag modifier into the converter in batches through a top bin; (3) after slag is formed, furnace shaking and slag splashing are carried out; and (4) after slag splashing is finished, deslagging is carried out, the bottom blowing nitrogen flow is adjusted, tuyere inspection is carried out after deslagging, and next-furnace smelting is carried out. The final slag oxidability is reduced through high-strength bottom blowing, the slag is rapidly cooled, the furnace shaking process enters the slag splashing stage after tapping is finished, the slag splashing time is shortened, nitrogen and slag modifier consumption is reduced, the formed slag is large in lumpiness and more prone to being attached to a furnace lining, the thickness of a slag splashing layer is increased, the furnace protection quality is improved, the service life of a bottom gun is prolonged, and the combined blowing effect is guaranteed; converter smelting period is shortened, and production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and relates to a slag splashing method from a bottom gun of a converter. Background technique [0002] The existing traditional top gun slag splashing technology is that after the converter is finished tapping, the furnace body is shaken up, a slag adjusting agent is added, the refractoriness of the slag is adjusted and the slag is cooled, and then high-pressure nitrogen is injected by the top gun, and the nitrogen stream is The slag is impacted and broken, making it splash and stick to the furnace wall. Uninterrupted injection of high-pressure nitrogen will further reduce the temperature of the molten slag, and the slag blocks will continue to adhere to the furnace wall to form a slag splash layer to reduce the erosion of magnesia-carbon bricks and protect the furnace lining. Due to the low bottom blowing strength of traditional converters, when smelting IF steel and other high-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/34C21C5/28
CPCC21C5/34C21C5/28
Inventor 张彦龙孟凡雷唐笑宇代红星闫龙格何顺生侯英辉
Owner HANDAN IRON & STEEL GROUP
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