Repairing method for steel ladle wall permanent layer

Abstract

The invention provides a repairing method for a steel ladle wall permanent layer. The repairing method is implemented after slag line bricks of a steel ladle wall working layer are dismantled, and comprises the specific operation steps that the wall permanent layer is cleaned, self-flow castable is prepared, new slag line bricks are laid several times, 1-2 layers are laid every time, the self-flow castable is poured between the new slag line bricks and heat preservation bricks after laying is finished, the steps are repeatedly executed till a 40-60 mm gap is reserved between new slag line bricks on the uppermost layer and a ladle edge opening swaged plate, the gap serves as an expansion gap and is filled with repairing materials, finally natural curing and baking are carried out, and therefore wall permanent layer repairing and new slag line brick laying are achieved. The self-flow castable is added with water and then stirred, vibration is avoided, and the constriction saves time and labor. In addition, the strength of the wall permanent layer is large after pouring due to the specific proportional range of Al2O3 and MgO, the repaired portion of the wall permanent layer is not likely to be poured out or damaged during ladle dismantling and overturning, the integrity is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to a construction process of lining a refractory material in a liquid steel metallurgical container containing steel, and a method for repairing a permanent layer of a ladle wall. Background technique [0002] The ladle is a container for carrying molten steel and refining outside the furnace, and it is an indispensable tool for transportation, refining outside the furnace and pouring molten steel in the process of connecting the converter to the steelmaking production process. The ladle is used as a container for carrying molten steel and refining outside the furnace, and its inner refractory material is divided into two layers: a permanent layer and a working layer. The permanent layer of the ladle wall is generally cast in one piece; the working layer of the ladle wall is divided into the molten pool part and the slag line part. The molten pool part is generally built with integral casting mode or shaped refractory bricks. Bri...

AI Technical Summary

Problems solved by technology

The permanent layer of the ladle wall is generally cast in one piece; the working layer of the ladle wall is divided into the molten pool part and the slag line part. The molten pool part is generally built with integral casting mode or shaped refractory bricks. Brick masonry is called slag line brick. After a certain period of use, the slag line brick needs to be dismantled and repaired. Since the slag line brick is removed by unpacking machine or pneumatic pick, the vibration during the demolition process is easy to damage the self-flowing castable of the permanent layer of the wall. , and then cause the wall permanent layer self-flowing castable to crack or fall off in a large area. Under normal circumstances, if the wall permanent layer crack is ≤ 5mm, it should be repaired with green mortar; if the wall permanent layer crack is ≥ 5mm, it should be repaired with ladle wall repair material repair

However, if the ladle wall repair material is used for repair when the permanent layer of the wall falls off in a large area, there will be a risk of steel breakout due to the insufficient compactness of the repair material

Therefore, those skilled in the art propose to use the self-flowing castable of the original permanent layer for repairing, but this method needs to use a vibrating rod to vibrate and compact the self-flowing castable in actual operation. Due to the vibration of the vibrating rod, the already masonry may be damaged. The displacement of the new slag line bricks will cause the mortar of the new slag line bricks to be not full or the brick joints exceed the standard, and there are also potential accidents of infiltration of molten steel or even steel leakage

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