CN-122012839-A - Molten iron pretreatment stirring device and application method thereof

Abstract

The stirrer is obliquely inserted into molten iron, an included angle alpha between the stirrer and the horizontal direction is 20-60 degrees and is adjustable, the stirrer comprises stirring rods and stirring rods, the stirring rods are axially symmetrically arranged by taking the stirring rods as shafts, the stirring rods are mutually parallel, and the stirrer rotates by taking the stirring rods as shaft centers through driving. Compared with the prior art, the method has the beneficial effects that 1, the stirring rod directly stirs the desulfurizing agent into the molten iron to obtain good dynamic conditions for mixing the molten iron and the desulfurizing agent, and 2, the material exchange rate between slag and the molten iron is far higher than that of the traditional stirring method because a rotating flow field with an included angle of 20-60 degrees with the vertical direction is obtained.

Inventors

• HUANG YUPING
• JIN ZHE
• LIAO XIANGWEI

Assignees

• 鞍钢股份有限公司

Dates

Publication Date

20260512

Application Date

20260309

Claims (5)

1. 1. The utility model provides a molten iron pretreatment stirring device, its characterized in that includes the agitator, the agitator slope inserts in the molten iron, and agitator and horizontal direction's contained angle alpha is 20 ~60, the agitator includes puddler and puddler, and a plurality of puddlers use the puddler to be the axisymmetric arrangement as the axle, are parallel to each other between the puddler, the agitator uses the puddler to be the axle center rotation through the drive.
2. 2. The stirring device for molten iron pretreatment of claim 1, wherein the number of stirring rods is 2-6.
3. 3. The molten iron pretreatment stirring device according to claim 1, wherein the outer layer of the stirrer is made of refractory materials, and the inner part of the stirrer is made of steel material core bars.
4. 4. The stirring device for molten iron pretreatment according to claim 1, wherein the diameter D of the circumference of the stirring rod is 500-2500 mm, the stirring rod is cylindrical or square rod-shaped, the diameter range of the cylindrical shape is 50-250 mm, the side length of Fang Bangzhuang is 50-250 mm, and the length L is 1000-3000 mm.
5. 5. A method of using the molten iron pretreatment stirring device of any one of claims 1 to 4, comprising: 1) Moving the hot metal ladle to be treated to a treatment station; 2) Reducing 50% -80% of the length of the stirring rod into molten iron; 3) The desulfurizing agent is put on the surface of the molten iron; 4) Turning on a power supply, and rotating the stirrer at the rotating speed of 30-180 rpm; 5) After desulfurization reaches the target value range, stirring is stopped, the stirrer is lifted, and the treatment is finished.

Description

Molten iron pretreatment stirring device and application method thereof Technical Field The invention belongs to the technical field of metallurgy, and particularly relates to a molten iron pretreatment stirring device and a using method thereof, which are suitable for stirring molten iron for molten iron pretreatment. Background The desulfurization process for molten iron pretreatment is one of effective ways for reducing desulfurization burden of iron making and steel making processes, simplifying operation and improving economic indexes of iron making and steel making technologies. The molten iron desulfurization process in the modern ferrous metallurgy process mainly has two process forms, namely a blowing method and a KR stirring method. From the application effect in practical production, both have serious disadvantages. The blowing method has the defects of low stirring efficiency and insufficient dynamic conditions for desulfurizing molten iron. The KR stirring method has the defects that the loss of the lining refractory material is extremely large due to severe scouring caused by severe rotation of molten iron, and meanwhile, the efficiency of the formed molten iron vortex flow field is low because of being involved in a desulfurizing agent. Simultaneously, the rotation resistance of the blade is very large, so that the blade has high material resistance loss and power consumption, and the desulfurization cost is high. Therefore, there is a need to develop a stirring method having high stirring efficiency and high entrainment rate of the desulfurizing agent. The utility model discloses a molten iron desulfurization spray gun (application number: CN202320628530.5, authorized bulletin number: CN 220537846U), which relates to the technical field of molten iron pretreatment and comprises a connecting flange, a rib plate, a refractory material protection layer, a spray pipe, a graphite head and the like, wherein the refractory material protection layer is arranged on the outer side of a spray gun main pipe, the front end of the spray gun main pipe is connected with one end of the spray pipe, the graphite head is arranged at the other end of the spray pipe, a positioner is arranged at one end, far away from the spray pipe, of the spray gun main pipe, the rib plate is arranged at the upper end of the spray gun main pipe, and the flange is arranged at the top end of the rib plate. Two layers of reinforcing rib plates are uniformly welded on the periphery of the blowing pipe, and anchoring parts are welded between the two layers of reinforcing rib plates. Firstly, a large number of rib plates are added in the gun body to ensure the stability of the gun body, a replaceable refractory graphite head is added at the gun head part to ensure that the gun is not eroded and blocked by splash slag, and the replacement is simpler and more convenient along with the increase of the service life of the spray gun, so that the desulfurization spray gun is ensured to be suitable for the change of various molten iron pretreatment working condition environments. Disclosed is a method for desulfurizing molten iron, which comprises adding a first amount of limestone into molten iron to be desulfurized when the temperature of the molten iron to be desulfurized is higher than a first preset temperature, controlling a stirring head to rotate when the added first amount of limestone melts, adding a second amount of desulfurizing agent into the molten iron to be desulfurized when a vortex is formed in the molten iron to be desulfurized, obtaining stirring parameters, and controlling the stirring head to stir and desulfurize according to the stirring parameters. In this way, the temperature of the molten iron to be desulfurized can be reduced by adding the first amount of limestone into the molten iron to be desulfurized under the condition that the temperature of the molten iron to be desulfurized is higher than the first preset temperature, so that the agglomeration phenomenon of the desulfurizing agent is reduced, the desulfurizing effect of the desulfurizing agent is improved, and the decomposing product of the limestone can play a role in desulfurizing, so that part of the desulfurizing agent can be replaced, the amount of the desulfurizing agent is further reduced, and the aim of saving the cost is achieved. None of the above patent documents improves the dynamic conditions of mixing the molten iron and the desulfurizing agent, so that the ideal effect is far from being achieved, and the requirements cannot be well met. Disclosure of Invention The invention aims to provide the stirring device for molten iron pretreatment and the using method thereof, which can obviously shorten and improve the dynamic conditions of mixing molten iron and a desulfurizing agent, reduce the time for desulfurizing the molten iron and the dosage of the desulfurizing agent, thereby ensuring that the production is more smooth and the production cost