A method for controlling the drainage sand into the tundish in the continuous casting process

Abstract

The invention discloses a method for controlling flow guiding sand to enter tundish in the continuous casting process and belongs to the field of continuous casting of iron and steel. The method includes the steps that firstly, before casting of a previous furnace steel ladle is completed, for a steel ladle without casting starting, located on a standby position of a steel ladle revolving platformand provided with flow guiding sand, inert gas is blown into molten steel through a breathable water gap base brick at the bottom of the steel ladle; and when the steel ladle rotates on the steel ladle revolving platform till an angle with a steel ladle casting position is 20 degrees to 50 degrees, rotation stops; secondly, a waste steel groove is placed below a steel ladle water gap, due to continuous gas blowing in the period from the time when it is started to blow in the inert gas to the time when rotation stops for the first time, the temperature of molten steel over the breathable watergap base brick is made to increase by 2-5 DEG C, a sliding water gap is opened for the first time, and the flow guiding sand and an extremely small amount of molten steel are discharged; and when allthe flow guiding sand is discharged, the sliding water gap is closed; and thirdly, it is kept to blow in the inert gas, the steel ladle is fast rotated to the casting position, and is connected witha large ladle long water gap, the sliding water gap is opened for the second time, and normal casting starting starts; and after normal casting starting of the steel ladle starts, it is stopped to blow in the inert gas.

Description

technical field [0001] The invention belongs to the field of continuous casting of iron and steel, and in particular relates to a method for controlling drainage sand to enter a tundish in a continuous casting process. Background technique [0002] In the continuous casting production process, it is usually necessary to use ladle drainage sand for drainage, that is, add drainage sand to the upper nozzle of the ladle. When the sliding nozzle slide plate is opened, the drainage sand will fall due to the pressure of the molten steel, and the molten steel will automatically flow out with the drainage sand. flow out. After the molten steel is automatically poured, the drainage sand will also enter the tundish. Due to the large size of the drainage sand, if it cannot be removed in time, it will react with the molten steel to form large inclusions in the steel, which will seriously pollute the molten steel and significantly deteriorate the casting. Blank and product quality. [0...

AI Technical Summary

Problems solved by technology

A small number of iron and steel enterprises manually pick up part of the drainage sand before the molten steel flows out of the ladle. Although this partially reduces the amount of drainage sand flowing into the tundish, a considerable amount of drainage sand will still enter the tundish; Sand has the following disadvantages: ①The operation is poorly controllable and the labor intensity of workers is high; ②There are potential safety hazards

This patent has the following shortcomings: complex equipment, high cost, and cumbersome operation; no specific operating parameters are given, which is of little significance for practical application guidance on the spot; no consideration is given to the narrow space between the ladle and the tundish, and then the drainage sand is installed. Devices and other devices will affect the normal pouring production and are not suitable for large-scale production applications on site

[0005] At present, there is no effective method that can completely prevent the drainage sand from flowing into the tundish, and the pollution to the molten steel caused by the drainage sand flowing into the tundish cannot be completely eliminated. The present invention proposes a method for controlling the drainage sand into the tundish during the continuous casting process. It can completely solve the technical problem of drainage sand flowing into the tundish, and has low cost and easy operation, which is of great significance to the stable production of high-quality steel

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