Masonry method of permanent ladle layer by using magnesia carbon bricks

Abstract

The invention discloses a method for building a permanent ladle layer by using magnesia carbon bricks, which comprises the following steps of: selecting the traditional ladle layer material magnesia carbon bricks for building the permanent ladle layer; during building, firstly, knotting a ladle bottom permanent layer to a specified thickness by using a castable of the permanent ladle layer, then leveling the knotted ladle bottom permanent layer by using a 3 mm ladle bottom padding, tightly attaching a ladle shell insulating layer or a ladle wall insulating layer on the leveled ladle bottom permanent layer one cycle by one cycle from bottom to top to build a permanent layer area and a slag line permanent layer area, and distributing adjacent magnesia carbon brick layers in a staggered mode in the vertical direction of building joints; and pressing the magnesia carbon bricks of the built permanent layer by using a method for welding press plates when building to the height 400 mm away from the ladle shell, and sealing the ladle mouth by using a ladle mouth knotting material after the ladle working layer is built. The invention has the advantages that when being corroded and damaged, the ladle working layer can still resist the corrosion of liquid steel, and the leakage accident of the ladle is avoided; the service life is prolonged to more than 1000 times; and cracks with large criss-cross structure can not occur during long-time use.

Description

technical field [0001] The invention relates to a permanent layer of a steel ladle, in particular to a method for building the permanent layer of a steel ladle with magnesia-carbon bricks. Background technique [0002] Conventional steel ladles are provided with insulation layer, permanent layer and working layer sequentially from the shell to the inside, and the permanent layer of the ladle is built from the earliest high-alumina T-3 refractory bricks. Since the permanent layer of the ladle shows signs of steel penetration in the brick joints, the unpacking process is easily removed together with the penetration of steel, and the service life is short; after the edge of the ladle is changed to a vertical pressing plate, it cannot play the role of compressing the permanent layer bricks of the ladle. The permanent layer bricks are easily partially poured out when unpacking and turning over the package. Due to the shortcomings of the above-mentioned permanent layer, it has gr...

AI Technical Summary

Problems solved by technology

Since the permanent layer of the ladle shows signs of steel penetration in the brick joints, the unpacking process is easily removed together with the penetration of steel, and the service life is short; after the edge of the ladle is changed to a vertical pressing plate, it cannot play the role of compressing the permanent layer bricks of the ladle. The permanent layer bricks are easily partially poured out when unpacking and turning over the package

Due to the shortcomings of the above-mentioned permanent layer, it has gradually transitioned to the current integral casting of ladle castables. Although the service life of the integrally cast ladle permanent layer has been improved and the labor intensity has been significantly reduced, the permanent layer ladle castable cannot well resist Molten steel erosion, when the ladle bricks in the working layer of the slag line are eroded, it is very easy to cause the slag line to penetrate the ladle

At the same time, the permanent layer of the ladle poured as a whole, the thermal stress after being heated during use cannot be evenly decomposed, and large vertical and horizontal cracks often occur, which brings hidden dangers to safe production

Images