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Maintenance method for converter lining

A converter lining and converter technology, applied in lining repair, manufacturing converters, etc., can solve problems such as increasing shutdown time, achieve the effects of protecting furnace lining, increasing viscosity, and improving converter operation rate

Inactive Publication Date: 2013-01-02
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding steel scrap and tilting the converter can quickly cool down the converter, so that the reserved steel slag in the furnace can be sintered with the inner lining or self-replenishing. This self-replenishing method does not need to add any equipment and raw materials, but it also has the disadvantage of adding additional shutdown time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The 180-ton converter estimates that the total amount of slag is between 18 and 20 tons. During the process of tapping to the west side, the feeding material is manually added to the trunnion of the furnace lining, and the amount of magnesium feeding material added is controlled. At 80-150kg, at the same time, use a gunning gun to spray the gunning material on the furnace cap on the east side of the converter, and the spraying speed of the gunning gun is 60-100kg·min -1 , the amount of magnesia gunning material is generally controlled at 180kg-250kg, and the amount added is adjusted according to the actual slag state. After tapping, the slag splashing operation is directly performed to protect the furnace. The slag is not modified during the slag splashing process, and the slag can be removed within 3 minutes. Splash dry.

[0016] The average time of slag splashing in the original process is 4 minutes, and each shift needs to be shut down and sprayed for 10 minutes each...

Embodiment 2

[0018] The total amount of slag in the 180-ton converter is estimated to be between 15 and 17 tons according to the smelting conditions. During the process of tapping to the west side of the 180-ton converter, the feeding material is manually fed to the trunnion of the furnace lining. The magnesium feeding material is The amount of slag is generally controlled at 150kg to 250kg, and the amount added is adjusted according to the actual slag state. After the steel is tapped, the slag splashing operation is performed directly to protect the furnace. The slag is not modified during the slag splashing process, and the slag can be splashed dry within 2.5 minutes.

[0019] The average time of slag splashing in the original process is 4 minutes, and each shift needs to be shut down and sprayed for 10 minutes each time. After adopting this process, the slag splashing time can be shortened by 1.5 minutes, and the converter does not need to be shut down for spraying. The average daily outp...

Embodiment 3

[0021] The total amount of slag in a 180-ton converter is estimated to be between 17 and 19 tons. After shaking the furnace to the east to measure the temperature and take samples, and within 5 minutes of waiting for the test results, use a gunning gun to spray the gunning material on the furnace on the west side of the converter. For the cap part, the spraying speed of the gunning gun is 60-100kg·min -1 , the amount of magnesium gunning material is generally controlled at 300-450kg, adjust the amount according to the actual slag state, and then shake to the west side for tapping operation, after the steel tapping is completed, directly carry out the slag splashing operation to protect the furnace, and the slag splashing process is not carried out The slag is modified, and the slag can be splashed dry within 3.5 minutes.

[0022] The average time of slag splashing in the original process is 4 minutes, and each shift needs to be stopped for 10 minutes for gunning. After adoptin...

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PUM

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Abstract

The invention involves a maintenance method for the converter lining. The method is characterized in that: during the process of converter turndown for sampling, standing for tapping or taping, spray repair operation and / or manual feed repair operation is performed to the part of the furnace lining not covered by steel slag, and modification to the slag is not required to be performed during the slag splashing furnace maintenance process performed after tapping is finished. Compared with the prior art, the method has the advantageous effects that: a part of spray repair material or feed repair material adheres on the furnace lining, increases the thickness of the slag splashing layer, and has effect on furnace lining protection, and the rest spray repair material or feed repair material enters into the slag, is molten under the high temperature action of the slag; and since the spray repair material or feed repair material has higher MgO content, the slag viscosity can be remarkably increased, so that slag modification is not required to be performed during the slag splashing furnace maintenance process after the following tapping is finished, and under the condition that slag splashing furnace maintenance time is remarkably shortened, the slag splashing effect is still superior to that the modified slag not adopting the process, in addition, adoption of the process has no need of shutdown of the furnace, so that the converter operating rate can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a method for maintaining the lining of a converter. Background technique [0002] At present, the maintenance methods of the converter lining mainly include large-scale repairing, manual repairing, gunning, and slag splashing to protect the furnace. Among them, large-scale repairing is the main method. In the shaking furnace, the large material is spread on the east and west sides, and then sintered naturally or by oxygen to protect the lining; the artificial repairing process refers to manually replenishing the furnace lining at the weak part of the furnace lining; the gunning process is through the spray gun The gunning material is sprayed on the weak part of the furnace lining to protect the furnace lining; the furnace lining is protected by slag splashing after the converter is tapped, and the slag with high MgO content is splashed on the furnace lining by high-pressu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/44F27D1/16
Inventor 李伟东徐福泉吴春杰孙群栗斌王成青张颖
Owner ANGANG STEEL CO LTD
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