Rapid re-blowing method for vanadium bearing titanomagnetite blast furnace smelting

A vanadium titanomagnetite and blast furnace smelting technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve the problems of high process consumption, abnormal furnace conditions, waste of raw materials and gas resources, etc., to increase the contact area and reduce resource consumption. , the effect of speeding up

Active Publication Date: 2018-09-18
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After using for a period of time or encountering a special accident, the ironmaking blast furnace will be shut down for inspection and re-airing after troubleshooting. However, with the enlargement of the blast furnace and the deterioration of the quality of raw materials and fuels, the re-airing process of the blast furnace will be more complicated. It is difficult to control and predict, and poor control may even lead to abnormal furnace conditions, leading to a series of problems such as long-term treatment of furnace conditions, deterioration of working condition indicators, and excessive process consumption. Therefore, the re-airing plan directly determines the follow-up furnace condition recovery process, economic technology Indicators, process consumption and furnace conditions can maintain long-term stable operation
The existing re-airing method generally only adjusts the air volume to slowly restore the furnace condition. This process is quite long, usually takes a day or two, and is likely to cause waste of raw materials and gas resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] For the re-airing of the blast furnace that has been closed for 3 hours, the charging system: use three-ring cloth charging, the angle difference between the outer ring of the ore and the outer focus is controlled at 1°, and the angle difference between the inner ring of the ore and the inner focus is controlled at 5°; the air supply system : All tuyeres normally supply air; slagging system: the binary basicity of slag is lowered by 0.01; thermal system: the mass percentage of Si and Ti total content in molten iron is controlled by 0.30%. It takes 11 hours for the furnace condition to return to before the wind shutdown, and 26 hours if the traditional re-air method is used

Embodiment 2

[0033] For the re-airing of the blast furnace that has been closed for 12 hours, the charging system: use three-ring cloth charging, the angle difference between the outer ring of the ore and the outer focus is controlled at 3°, and the angle difference between the inner ring of the ore and the inner focus is controlled at 6°; the air supply system : select 6 tuyeres, reduce its air supply area by 12%; slagging system: reduce the binary basicity of slag by 1; thermal system: control the mass percentage of Si and Ti total content in molten iron by 0.50%. It takes 14 hours for the furnace condition to return to before the wind shutdown, and it takes 32 hours if the traditional re-air method is used

Embodiment 3

[0035] For the re-airing of the blast furnace that has been closed for 24 hours, the charging system: double-ring cloth charging is adopted, the angle difference between the outer ring of the ore and the outer focus is controlled at 3°, and the angle difference between the inner ring of the ore and the inner focus is controlled at 6°; the air supply system: Select 5 tuyeres and reduce the air supply area by 20%; slagging system: reduce the binary basicity of slag by 1.05; thermal system: control the mass percentage of Si and Ti in molten iron at 0.60%. It takes 16 hours for the furnace condition to return to before the wind shutdown, and 60 hours if the traditional re-air method is used.

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PUM

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Abstract

The invention discloses a rapid re-blowing method for vanadium bearing titanomagnetite blast furnace smelting, and belongs to the technical field of vanadium bearing titanomagnetite blast furnace smelting. A reasonable charging system, a reasonable blowing system, a reasonable slagging system and a reasonable thermal system are adopted to achieve re-blowing. The charging system is characterized byadopting 2-3-ring distribution to achieve charging and ensuring that an angle difference between the outer ring of the above ore and outer coke is controlled at 1-3 DEG and an angle difference between the inner ring of the ore and inner coke is controlled at 5-6 DEG; the blowing system is characterized by adjusting the sizes of 2-8 air ports having an angle of 90 DEG with an iron notch in order to reduce the blowing area by 5-25%; the slagging system is characterized by reducing the binary alkalinity of slag by 0.01-1.05; and the thermal system is characterized by controlling the furnace temperature to ensure that the total content of Si and Ti in molten iron is 0.30-0.60 mass%. The method improves the contact area of a raw material and air, the wind speed and the fluidity of a mixture, so the recovery of a blast furnace to a state before damping down is greatly accelerated.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting of vanadium-titanium-magnetite, in particular to a re-airing method for blast furnace smelting of vanadium-titanium-magnetite. Background technique [0002] After being used for a period of time or in case of special accidents, ironmaking blast furnaces will be shut down for maintenance, and re-airing will be carried out after troubleshooting. However, with the increase in the size of the blast furnace and the deterioration of the quality of raw materials and fuels, the re-airing process of the blast furnace will be more complicated. It is difficult to control and predict. Poor control may even lead to abnormal furnace conditions, leading to a series of problems such as long-term treatment of furnace conditions, deterioration of working condition indicators, and excessive process consumption. Therefore, the re-airing plan directly determines the follow-up furnace condition recovery p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C21B5/04
CPCC21B5/00C21B5/008C21B5/04
Inventor 曾华锋雷电宋剑曹勇岳彩东张海军张远祥黄彬陈刚赵甲虎杨荣张邦志
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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