Method for repairing furnace lining of intermediate frequency furnace for steelmaking

A technology for furnace lining repair and intermediate frequency furnace, which is applied in the direction of lining repair, furnace, electric furnace, etc. It can solve the problems of time and labor required for furnace lining, difficulty in combining furnace lining with original furnace lining, poor furnace wall repair effect, etc., and achieve sintering effect Good, fast and effective repair, easy to master effect

Inactive Publication Date: 2006-02-08
QINGTONGXIA ALUMINUM IND GROUP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] Since the melting point of quartz sand is about 1700°C, which is close to the molten steel temperature of about 1600°C, and the medium-frequency induction furnace has a relatively strong heating capacity (up to 10°C / min), and it also has electromagnetic stirring effect, it is easy to cause molten steel to melt first. Rapid heating and rinsing of the furnace bottom and furnace wall will cause loss of the quartz sand furnace lining. Usually, the furnace lining will become thinner and fail after 40-50 furnace times. figure 1 As shown, at this time, the furnace lining is often in the shape of an elephant foot, and it takes a lot of time and labor to rebuild and sinter the furnace lining. Therefore, the user often chooses to repair the failed furnace lining. Dry material hot repair is a commonly used furnace repair method. However, from the point of view of the use effect, it has certain defects, mainly in: (1), the repair effect on the furnace wall is not good, and the repair material is not easy to combine with the original furnace lining; (2), after repair, add steel material for sintering , due to the different shapes and sizes of the steel materials, the contact with the furnace is not uniform, resulting in poor sintering of the furnace surface, and part of the repair material peeling off

Method used

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  • Method for repairing furnace lining of intermediate frequency furnace for steelmaking
  • Method for repairing furnace lining of intermediate frequency furnace for steelmaking

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Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 As shown, usually after 40-50 heats, the furnace lining becomes thinner and fails, often in the shape of an elephant foot. At this time, the obvious characteristics are: the melting speed is obviously accelerated, the liquid level of the molten steel of the same weight is lower than the initial stage by more than 300mm, and the local There are obvious deep recesses, and when it is found that the thickness of the current lining is less than or equal to 40% of the original lining thickness during actual production, the lining can be repaired.

[0032] Pour out all the molten steel in the furnace. If there is any remaining part, wait for it to solidify and remove it, and clean up the residue attached to the furnace. Sprinkle boric acid with a particle size of 1mm evenly on the bottom 2 of the furnace. The thickness of boric acid is controlled at 5mm or according to the weight of boric acid. / Furnace bottom 2 area is 2.0Kg / m 2 Add boric acid, and then put...

Embodiment 2

[0034] When the thickness of the front lining is less than or equal to 40% of the original lining thickness, the lining can be repaired.

[0035] Pour out all the molten steel in the furnace, if there is any remaining part, take it out after it solidifies, and clean up the residue attached to the furnace, evenly sprinkle boric acid with a particle size of 1.5mm on the bottom 2 of the furnace, control the thickness of boric acid at 5.5mm or press Boric acid weight / area of ​​furnace bottom 2 is 2.25Kg / m 2 Add boric acid, and then put in an appropriate amount of quartz sand that is exactly the same as the furnace lining in terms of composition and particle size as the furnace material according to the loss of the second part of the furnace bottom. Furnace mending is put into the furnace with forming steel mold 3, as figure 2 As shown, the forming steel mold 3 is a barrel shape matched with the furnace wall 1, and then a steel block 4 is put into the forming steel mold 3, the si...

Embodiment 3

[0037] When the thickness of the front lining is less than or equal to 40% of the original lining thickness, the lining can be repaired.

[0038] Pour out all the molten steel in the furnace, if there is any remaining part, take it out after it solidifies, and clean up the residue attached to the furnace, evenly sprinkle boric acid with a particle size of 2mm on the bottom 2 of the furnace, and control the thickness of boric acid at 6mm or according to the weight of boric acid / Furnace bottom 2 area is 2.5Kg / m 2 Add boric acid, and then put in an appropriate amount of quartz sand that is exactly the same as the furnace lining in terms of composition and particle size as the furnace material according to the loss of the second part of the furnace bottom. Furnace mending is put into the furnace with forming steel mold 3, as figure 2 As shown, the forming steel mold 3 is a barrel shape matched with the furnace wall 1, and then a steel block 4 is put into the forming steel mold...

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Abstract

The present invention is furnace lining repairing process, and is especially the furnace lining repairing process for steelmaking IF furnace. The furnace lining repairing process includes the following steps: determining repairing time, clearing furnace inside, applying adhesive and furnace building material, setting forming steel mold and starting mold block, applying furnace building material, and sintering furnace building material. The furnace lining repairing process is relatively simple, and has effective repair of furnace lining, organic combination of the repair material and original furnace building material, flat furnace bottom, homogeneous heating of the hearth, good sintering effect and long service life of the repaired furnace lining.

Description

technical field [0001] The invention relates to a furnace lining repair method, in particular to a method for repairing the furnace lining of an intermediate frequency furnace for steelmaking. Background technique [0002] The steelmaking process of the intermediate frequency furnace is simple, and the required investment is relatively economical. Quartz sand is a widely used furnace material. The Chinese invention patent application "Induction Furnace Lining Sand" (public number: CN 1171539A, public date: January 28, 1998, Application No.: 96118045.5) and "Acidic Furnace Lining Refractories for Induction Electric Furnace" (publication No.: CN 1110964A, publication date: November 1, 1995, application No.: 94110946.1), all compared the quartz sand materials used for furnace construction in detail. instruction of. [0003] Since the melting point of quartz sand is about 1700°C, which is close to the molten steel temperature of about 1600°C, and the medium-frequency induction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D1/16C21C5/52
CPCY02P10/20
Inventor 丁永华王宁
Owner QINGTONGXIA ALUMINUM IND GROUP
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