Method for repairing furnace lining of intermediate frequency furnace for steelmaking
A furnace lining repairing and intermediate frequency furnace technology is applied in the lining repairing, furnace, electric furnace and other directions, which can solve the problems of poor furnace wall repairing effect, large time and labor required, poor furnace surface sintering, etc., and achieves good sintering effect. Easy to master, fast and effective repair effect
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Embodiment 1
[0031] As shown in Figure 1, usually after 40-50 heats, the furnace lining becomes thin and fails, often in the shape of an elephant foot. At this time, the obvious characteristics are: the melting speed is obviously accelerated, and the liquid level of the molten steel of the same weight is lower than the initial 300mm Above, there are obvious deep recesses locally. In actual production, when it is found that the thickness of the current furnace lining is less than or equal to 40% of the original furnace lining thickness, the furnace 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 in an ...
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. The forming steel mold 3 for repairing the furnace is put into the furnace, as shown in Figure 2, the forming steel mold 3 is a barrel shape matched with the furnace wall 1, and then the steel block 4 is put into the forming steel mold ...
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. The forming steel mold 3 for repairing the furnace is put into the furnace, as shown in Figure 2, the forming steel mold 3 is a barrel shape matched with the furnace wall 1, and then the steel block 4 is put into the forming s...
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Abstract
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