A method for suppressing eddy current slag entrainment at the end of ladle tapping

Abstract

The invention discloses a method for inhibiting vortex slag entrapment at the last phase of steel ladle tapping. An electromagnetic stirrer is encapsulated on the lower portion of a steel ladle lowerbrick cup; a gap of the electromagnetic stirrer and the lower brick cup is filled with a heat insulating refractory material; and a power line guiding-out opening and a cooling pipeline guiding-out opening are formed in a steel ladle bottom shell. Under the condition that the electromagnetic stirrer does not work, nitrogen with the pressure being 0.3-0.5 MPa is blown through a cooling pipeline tocool the electromagnetic stirrer. After steel tapping, when the height of molten steel in a steel ladle reaches one third of the total height, the electromagnetic stirrer is started to stir the moltensteel in a tapping hole so as to inhibit generation of vortex, the power of the electromagnetic stirrer is 30-100 kW, the power supply frequency is 5-20 Hz, and meanwhile the electromagnetic stirreris cooled with the wind pressure being 0.5-0.8 MPa. After tapping of the molten steel is finished, the tapping hole is closed, meanwhile the electromagnetic stirrer is powered off, and the electromagnetic stirrer continues to be subjected to wind cooling. Through the method, generation of the vortex can be inhibited, and vortex slag entrapment is reduced.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, in particular to a method for suppressing eddy current slag entrainment at the end of ladle tapping. Background technique [0002] When the solution is poured from one container to another, due to the accumulated energy of the solution, especially the kinetic energy around the container, it is easy to lose stability when the liquid level is lowered, forming a tiny vortex, called the confluence vortex. The eddy current generated by this converging vortex will cause slag entrainment during the ladle tapping process, especially in the later stage of tapping as the molten steel level drops, a penetrating vortex will be generated on the steel liquid level above the tapping hole, and it will intensify to promote slag The steel emulsification makes the slag enter the tundish with the steel flow, which easily pollutes the molten steel in the tundish. In addition, the vortex will also involve a large...

AI Technical Summary

Problems solved by technology

[0008] From the perspective of the above two methods, the common disadvantage is that due to the existence of the vortex at the end of tapping, the detection signal detection has a process from weak to strong.

During this process, part of the slag has already entered the tundish, causing pollution to the molten steel

If the signal for detecting and closing the sliding plate is set too small, it will inevitably cause too much steel left in the ladle, which will increase the consumption of steel materials and increase the cost

It can be seen that through electromagnetic detection, vibration detection and other detection methods, and then start the relevant slag blocking device, the slag blocking function can be realized, but it can only be used to prevent the slag from the ladle, and cannot prevent the vortex slag rolling phenomenon at the end of the ladle casting

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