Method for building container bottom of carbon-containing molten steel container

Abstract

The invention relates to a method for building the container bottom of a carbon-containing molten steel container, which comprises the following steps: firstly, pouring a high-aluminum pouring material layer 2 into a casing 1 of the molten steel container; building a carbon-free working layer 4 below a working layer 3 at the wall of the molten steel container and a carbon-containing working layer 5 above the working layer 3 at the wall of the molten steel container by three layers of carbon-free precast blocks 7; arranging the carbon-free precast blocks 7, a ventilation brick 8 and a slide water gap 9 at an impact area on the high-aluminum pouring material layer 2 at the container bottom 6 of the molten steel container; pouring a carbon-free pouring material layer 10 at a non-impact area on the high-aluminum pouring material layer 2 at the container bottom 6 of the molten steel container; and after pouring the container bottom 6 of the molten steel container, filling by a carbon-free pouring material along the carbon-free working layer 4 on the carbon-free pouring material layer 10 into a slope type encircling wall 11. The invention solves the change of physical properties, such as carbon-containing brick chalking, folding strength and the like, caused by the water of a pouring material at the container bottom of the molten steel container, controls steel clamping caused by the replacement of the bottom, has more stable running of the impact area at the bottom of a tank and is beneficial to the unity of large back molten steel containers with various varieties.

Description

technical field [0001] The invention relates to a masonry method with a carbon ladle bottom, which belongs to the masonry method for casting molten substance container linings, and is particularly suitable for the masonry method with a carbon brick ladle bottom for continuous steel casting. Background technique [0002] In the prior art, aluminum-magnesium-carbon bricks with two height brick types (A: 320mm and B: 280mm) are used for the bottom of the carbon ladle, both of which are vertically laid. A-type bricks are used in the middle molten steel impact area, and B-type bricks For use in non-impact areas. After the bottom brick of the ladle is built to the vicinity of the pit reserved for the breathable brick, the breathable seat brick is installed, and a 30-40mm gap is reserved around the breathable brick, and the gap is poured with corundum self-flowing material and rammed tightly. After the bottom brick is built, the wall is built after the brick is built, that is, the...

AI Technical Summary

Problems solved by technology

Since the bottom of the ladle is first used for masonry, it is necessary to retain the supporting bricks under the masonry wall, and the entire masonry wall cannot be removed. The matching tolerance of new bricks cannot be guaranteed and other problems, resulting in molten steel seeping into the permanent layer from the junction of new and old bricks after the bottom replacement, which seriously affects the safe operation of the ladle

The cost of replacing refractory materials for 25 bottom cycles is high

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