JPH04322873A - Apparatus for removing non-metallic inclusion in molten metal - Google Patents

Abstract

PURPOSE:To provide the apparatus having a device promoting heat radiation from a molten metal vessel. CONSTITUTION:By setting the device for spouting cooling fluid into gap between the molten metal vessel. 10 giving the molten metal horizontal rotating stream with shifting magnetic field and an electromagnetic coil, lowering of strength of the molten metal vessel 10 and damage of the electromagnetic coil are prevented. Heat from the molten metal vessel does not conduct to the electromagnetic coil side, and lowering of performance or damage of the electromagnetic coil device is eliminated, and temp. of the molten metal vessel member does not raise and the lowering of strength thereof can be prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing nonmetallic inclusions from molten metal.

0002

2. Description of the Related Art In continuous casting of steel, etc., there is a method of applying a horizontal rotational flow to molten metal in an intermediate container in order to separate and remove non-metallic inclusions in molten metal.

[0003] Various techniques have been disclosed as methods for providing the horizontal rotational flow, but the mainstream is one using a coil device.

[0004] JP-A-01-312024 and JP-A-02
According to No. 217430, the outer shell of the coil device is made of a metal such as austenitic stainless steel with low magnetic loss, and is disposed directly opposite the molten metal container.

[0005]

[Problems to be Solved by the Invention] In the above method in which the coil device is placed close to the molten metal container, the heat radiated from the molten metal container is directly transmitted to the coil device, resulting in a decrease in the casing strength of the coil device and poor coil performance. There were problems in that the temperature of the molten metal container member increased and the strength decreased.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for removing non-metallic inclusions from molten metal having a device for solving the above-mentioned problems and promoting heat dissipation from a molten metal container.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes at least a circulating tank for separating and removing non-metallic inclusions in the molten metal by imparting a horizontal rotational flow to the molten metal. A device comprising an intermediate container and a coil device disposed opposite to the intermediate container, the device comprising a cooling device for spouting a cooling fluid into a gap between the intermediate container and the coil device. A metal inclusion removal apparatus is provided.

[0007] Here, the cooling fluid is preferably air or air containing water mist.

The present invention will be explained in more detail below.

First, as an example of the non-metallic inclusion removing apparatus of the present invention, an outline of continuous steel casting will be explained. For example, as shown in FIG. 1, a ladle 5, an intermediate container 10 and a mold (
(not shown), the molten metal 6 in the ladle 5 is poured into a circulation tank 10a of an intermediate container 10 having a circulation tank 10a and a distribution tank 10b. The circulation tank 10a
Now, the circulation tank 1 is created by the electromagnetic coil device 1 for generating a moving magnetic field.
A rotational force is applied to the molten metal 6 in 0a, and a part of the molten metal 6 circulated here moves from the bottom of the circulation tank 10a to the distribution tank 10b, and further passes through the sliding nozzle 7 provided at the bottom of the intermediate container 10 and It is injected into a mold through an immersion nozzle 8 and cast to a predetermined size. 3 is an iron skin, and 4 is a fireproof material.

Therefore, in this process, nonmetallic inclusions are separated from the molten metal 6 in the circulating tank 10a, and clean molten metal is injected into the mold via the distribution tank 10b.

[0011] The present invention provides a circulation tank 10 of the intermediate container 10.
The cooling device 2 has a cooling device 2 that spouts cooling fluid into the gap between the coil device 1 and the coil device 1 disposed facing the coil device 1a.

For example, as shown in FIG. 2, the cooling device 2 includes a fluid injection nozzle header 2a provided along the lower end of the side surface facing the intermediate container 10 of the coil device 1, with its nozzle holes 2b directed upward. An example is one in which a hole is opened toward the direction, but the invention is not limited to this.

[0013] By supplying a fluid such as air to the cooling device 2 and ejecting it from the nozzle hole 2b, the iron skin 3 of the intermediate container 10 and the outer peripheral surface of the coil device 1 can be cooled. The surface of the conductor wire of the coil is covered with an insulating material, but as the coil temperature rises, this insulating material deteriorates, causing a short circuit. Therefore, the temperature of the coil device is 17
It is desirable to maintain the temperature below 0°C.

[0014] It is preferable to use air containing water mist as the fluid because it has a high cooling effect.

The flow velocity of the fluid may be selected depending on the degree of temperature rise of the iron skin 3 and the outer circumferential surface of the coil device, the heat resistance of those materials, etc.
/s. In the present invention, the molten metal is not particularly limited, and may include, for example, molten steel.

Further, in the present invention, the coil device is a commonly used electromagnetic coil device that generates a moving magnetic field, such as a linear motor.

[0017]

【Example】

The present invention will be specifically explained below based on examples. (Example 1) Molten steel (tinplate material) was continuously injected using the intermediate container 10, coil device 1, and cooling device 2 shown in FIG.
A slab was manufactured. Each condition was as follows. Intermediate container capacity
:15 ton circulation tank diameter
:1000mm fireproof material
:Thickness 300mm
basic brick iron skin
:Thickness 10mm Molten steel temperature
: 1550°C coil device : Linear semicircular coil Gap between intermediate container and coil device : 70 mm Cooling fluid, flow rate : Air, 1
0m/s

During operation, the temperatures of the coil device 1 on the side facing the intermediate container 10 and the surface of the iron shell 3 facing thereto were maintained at 100° C. and 350° C., respectively. For comparison, the temperatures of the coil device 1 without using the heat insulating material and the same portions of the surface of the iron skin 3 facing the coil device 1 were 200° C. and 450° C., respectively.

Furthermore, the temperature of the iron shell 3 did not rise, and no deformation or cracking occurred, and it could be used stably for a long period of time. Further, the temperature rise of the coil device 1 could be suppressed, and the coil device 1 could be used for a long period of time with stable performance.

[0021]

[Effects of the Invention] Since the present invention is constructed as described above, the cooling fluid is blown into the gap between the molten metal container and the electromagnetic coil device, which generates a horizontal rotational flow in the molten metal by a moving magnetic field. As a result, heat from the molten metal container is not transmitted to the electromagnetic coil device, thereby eliminating performance deterioration or failure of the electromagnetic coil device, preventing the temperature of the molten metal container member from rising, and preventing a decrease in strength.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a nonmetallic inclusion removal device showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a cooling device used in the present invention.

[Explanation of symbols]

1 Coil device 2 Cooling device 2a Nozzle header 2b Nozzle hole 3 Iron skin 4 Fireproof material 5 Ladle 6 Molten metal 7 Sliding nozzle 8 Immersion nozzle 10 Intermediate container (molten metal container) 10a Circulation tank 10b Distribution tank

Claims (2)

[Claims] 1. A device comprising: an intermediate container having at least a circulating tank for separating and removing non-metallic inclusions in the molten metal by applying a horizontal rotational flow to the molten metal; and a coil device disposed opposite the intermediate container. An apparatus for removing non-metallic inclusions from molten metal, comprising a cooling device that spouts cooling fluid into a gap between the intermediate container and the coil device. 2. The device for removing nonmetallic inclusions from molten metal according to claim 1, wherein the cooling fluid is air or air containing water mist.