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Method for repairing converter lining

A converter lining and converter technology, which is applied in the field of iron and steel metallurgy, can solve the problems of limited repairing of the furnace lining, poor safety, high labor intensity, etc., and achieve the effects of shortening the repairing time, not easy to fall off, and improving the repairing effect.

Inactive Publication Date: 2015-11-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing patent CN201110179831.6 discloses a method for maintaining the lining of a converter, which includes gunning or manually repairing the parts of the furnace lining that are not covered by steel slag while the converter is turning over the furnace, waiting for tapping or tapping. , and perform slag splashing to protect the furnace after tapping, and do not modify the slag during the process of slag splashing to protect the furnace
This method does not need to stop the furnace for operation, saves time, and improves the operation rate of the converter, but this method is limited to the repair of the furnace lining, and is not suitable for places where the furnace lining is particularly weak, and gunning or manual repair is performed during the production process, which has poor safety and labor intensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The estimated slag of the 180-ton converter is 16-20 tons (calculated on the basis of an average of 18 tons). Add 10kg / t of magnesium oxide particles to slag, add 120kg of magnesium oxide particles, add 96kg of dolomite according to the dolomite dosage of 8kg / t slag, temper the slag, and blow it evenly with nitrogen. Add 2 tons of magnesia-carbon bricks with a physical size of 300mm×200mm×70mm into it for sintering. The slag temperature is controlled between 1270±30°C. Tilt the converter back and forth to make the slag and magnesia-carbon bricks fully mixed evenly, and then tilt the converter at an angle The temperature is controlled at 106.7°, and the sintering time is 80 minutes to quickly repair the large surface of the furnace lining. After the repair, the carbon bricks are firmly bonded to the lining of the converter without falling off.

[0017] Compared with the traditional method of pasting magnesia-carbon bricks, this method saves at least 40 minutes of time f...

Embodiment 2

[0019] The estimated slag of a 180-ton converter is 13-16 tons. After tapping, 10 tons of slag will be set aside according to the mass ratio of slag to magnesia-carbon bricks (1 ton) to be added at 10:1. Add 30kg of dolomite to 3kg / t slag of dolomite, add 50kg of magnesium oxide particles to 5kg / t slag of magnesium oxide particles, temper the slag, and blow it evenly with nitrogen. Add 1 ton of magnesia-carbon bricks with a physical size of 300mm×200mm×70mm, and repeatedly tilt the converter back and forth to make the slag and magnesia-carbon bricks fully uniform, and then control the tilting angle of the converter at -99.3° to quickly repair the small surface of the furnace lining. The sintering time was 45 minutes. The temperature is controlled at 1180±30°C. After the repair, the carbon bricks are firmly bonded to the lining of the converter without falling off.

[0020] This method saves at least 75 minutes of time compared with the traditional magnesium-carbon conversion...

Embodiment 3

[0022] The estimated slag of a 180-ton converter is 15-18 tons. After tapping, 12 tons of slag will be set aside according to the mass ratio of slag to magnesia-carbon bricks (1.5 tons) to be added at 8:1. Add 60kg of dolomite to 5kg / t slag of dolomite, and 84kg of magnesia particles to 7kg / t slag of magnesium oxide particles to temper the slag and blow it evenly with nitrogen. Add 1.5 tons of magnesia-carbon bricks with a physical size of 300mm×200mm×70mm, and repeatedly tilt the converter back and forth to make the slag and magnesia-carbon bricks fully uniform, and then control the tilting angle of the converter at 103.6° to quickly repair the large surface of the furnace lining and sinter The time is 60 minutes. The temperature is controlled at 1250±30°C. After the repair, the carbon bricks are firmly bonded to the lining of the converter without falling off.

[0023] Compared with the traditional method of pasting magnesia-carbon bricks, this method saves 60 minutes of q...

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PUM

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Abstract

The invention relates to the field of ferrous metallurgy, in particular to a method for repairing a converter lining. The method is characterized by comprising the steps of reserving a defined amount of furnace slags according to the mass ratio between the furnace slags and magnesia carbon bricks to be added after tapping of a converter is finished, then conducting hardening and tempering on the furnace slags by adding MgO particles and dolomite, jetting and shaking up the furnace slags through nitrogen, and then adding the magnesia carbon bricks for sintering. By means of the method, the lining repairing effect is improved remarkably, the time for repairing a furnace is shortened, and the converter operation rate is improved; the labor intensity of workers is reduced remarkably, and the implementation safety is high.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for repairing the lining of a converter. Background technique [0002] At present, the repair and maintenance methods of the converter lining mainly include slag splashing to protect the furnace, dry gunning, wet gunning, pouring and sintering, and magnesia carbon brick repairing. Slag splashing furnace protection is to add a certain amount of magnesium oxide particles, dolomite, coke, etc. into the furnace to prepare the slag after the molten steel is tapped, and then use the high-pressure nitrogen in the oxygen lance to blow and splash the prepared slag to the converter lining above, forming a protection for the furnace lining. Dry gunning is to use dry spraying equipment to spray dry repair material to the weak part of the working layer of the converter lining, and after a short period of sintering, it will be bonded to the furnace lining to protect the furna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28
Inventor 孙树臣黄小晓卢帅丹朱小平李宽贺涂赣峰彭杨威张路杰袁天明
Owner NORTHEASTERN UNIV
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