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Molten iron slagging-off method

A technology of slag removal and molten iron, which is applied in the field of molten iron pretreatment process, can solve the problems of permeable bricks being easily damaged and unable to work in the furnace, and achieve the effect of reducing the amount of iron in slag removal, reducing sulfur return, and meeting the control of sulfur water content

Inactive Publication Date: 2011-04-27
ANGANG STEEL CO LTD
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Problems solved by technology

In order to prevent eddy current slag entrainment, porous ventilating bricks are installed at the steel outlet, and the eddy current is disturbed by blowing air. Generally, the thickness of ladle slag layer is less than 75mm in this method, but the ventilating bricks are easy to be damaged and cannot work in the whole furnace

Method used

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Embodiment Construction

[0012] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0013] A molten iron slag removal method, taking a 260-ton molten steel tank as an example, in the later stage of slag removal, inert gas is continuously blown into the molten iron tank at the farthest end of the slag removal side, and the steps are as follows:

[0014] 1) After molten iron is smelted, use a slag remover to remove slag until the thickness of the slag layer is less than 50mm;

[0015] 2) Extend the slag blowing pipe to 300-400mm below the molten iron level at the farthest end of the slag removal side, the gas source pressure is 0.6-0.8Mpa, and the gas flow rate is 15-30Nm 3 / h;

[0016] 3) After the slag removal is finished, stop blowing.

[0017] The inert gas is generally nitrogen with a purity greater than 98%, and other inert gases such as argon can also be selected. This method mainly discharges the slag to the slag-scrapin...

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Abstract

The invention relates to the field of molten iron pretreatment technologies, in particular to a molten iron slagging off method which is characterized in that an inert gas is continuously blown into a liquid iron tank at the farthest end on the slagging-off side at the later period of slagging off. The method comprises the following steps of: (1) carrying out slagging off by using a slagging off machine after iron is molten until the thickness of a slag layer is smaller than 50 mm; (2) stretching a slag blowing pipe 300-400 mm below the level of the molten iron at the farthest end on the slagging off side, and controlling air pressure at 0.6-0.8 MPa and air flow at 15-30 Nm3 / h; and (3) stopping blowing the gas after slagging off is completed. The gas is nitrogen, and the purity is greater than 98%. The invention has the advantages that slag is discharged to the slagging off side and gathered through gas churning, the slagging off time can be obviously shortened and is controlled within 10 min, the sulfur moisture content of a deeply-desulfurized steel grade can be well satisfied, the resulfurization of the melting process is reduced, and simultaneously, the slagging off iron content is reduced.

Description

technical field [0001] The invention relates to the technical field of molten iron pretreatment, in particular to a molten iron slag removal method. Background technique [0002] In the later stage of hot metal desulfurization and slag removal, the slag is dispersed, and the slag aggregate material needs to be added to increase the slag loss. After years of research, Japan Steel Tube Company found that the reason for the slag mixed into the steel flow out of the tap hole is mainly the steel flow suction vortex caused by the top of the tap hole. The higher the position of the suction vortex, the easier it is to carry the slag. Therefore, if the relative flow velocity of molten steel flowing out through the tapping hole is reduced, the height of the suction vortex generated can be reduced, thereby preventing the flow of slag. According to this research result, Japan Steel Tube Company proposed the tap hole air blowing interference eddy current method. The method is to instal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/072B22D43/00
Inventor 张志文于晖陈杰王文科于强刘庆辉
Owner ANGANG STEEL CO LTD
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