JPH027868Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an aluminum refining gas injection device for injecting refining gas into molten metal for refining aluminum or aluminum alloys.

[Prior art and its problems] For example, the "metal refining gas blowing pipe" shown in Utility Model Publication No. 45-32090 uses a breathable refractory at the tip of the blowing pipe that blows refining gas into the molten metal. By installing it, the refining gas can be dispersed and blown into the molten metal in the form of small bubbles. However, in cases where air-permeable refractories are simply attached, the bubbles that are blown out will have to grow large before they can be separated from the refractory surface. The buoyancy caused the buoyancy to rise before the smelting effect was achieved as expected. In addition, a conventional idea in which a gas outlet is provided in a part of a rotary blade that stirs molten metal is disclosed in Japanese Utility Model Publication No. 45-3522, but in this conventionally known configuration, a plurality of rotary blades are provided with a gas outlet. Since the rotor was located equidistant from the center of rotation of the rotating blade, gas diffusion was still poor, and there was a method of rotating at high speed to improve gas diffusion. This method had the risk of involving oxides.

[Means for Solving the Problems] The purpose of the present invention is to provide a gas blowing device for aluminum refining that eliminates such conventional drawbacks. A plurality of inclined blades are provided at the lower end of the blowing pipe, and openings communicating with the inside of the blowing pipe are provided at different radial distances from the blowing pipe on the lower surface of each inclined blade, and a breathable refractory is loaded into the openings. Configured.

[Function] Due to the rotating action of the blowing pipe, the refining gas diffuses into the molten aluminum in the form of minute bubbles and stays in the molten metal for a long time, mixing well with impurities and performing a powerful refining action.

Furthermore, since the refining gas is ejected through the breathable refractories provided at different radial openings on the lower surface of the inclined blades, it circulates throughout the bath and uniformly refines the molten metal.

[Example] An example of the present invention will be described below with reference to the drawings. In the figure, 1 is a hot water tank, 2 is a column vertically erected on one side, and the column 2 supports an arm 3 so as to be able to move up and down. A motor 4 is fixed to the base end 3a of the arm 3, and a pulley 6 is attached to the drive shaft 5 of the motor 4. Further, a bearing 7 is fixedly installed at the tip of the arm 3.

Reference numeral 8 denotes a refining gas blowing pipe having a hollow interior 8a, and the blowing pipe 8 is vertically supported by the bearing 7 so as to be rotatable. A pulley 9 is integrally attached to the blowing pipe 8 which protrudes slightly above the bearing 7, and an endless belt 10 is connected between the pulley 6 on the motor 4 side.
to be suspended. The upper end of the blowing pipe 8 is connected to a refining gas source via a joint 11.

As shown in FIG. 2, four inclined blades 12a, 12b, 12c, and 12d are provided radially at the lower end of the blowing pipe 8 at approximately equal intervals. The inclined blade 1
2a, 12b, 12c, and 12d each have an inclination angle of about 30 degrees with respect to the horizontal plane, as shown in FIG.
d to the blowing pipe 8. Slanted blades 12a, 12
Inside b, 12c, 12d are hollow passages 14a, 14b, 14 communicating with the hollow part 8a of the blowing pipe 8.
c, 14d, and the hollow passages 14a, 14b,
Inclined blades 12a, 12b, 1 from 14c, 14d
Openings 15a, 15 toward the lower surfaces of 2c, 12d
b, 15c, and 15d are provided. Here each opening 15
a, 15b, 15c, and 15d are dimensioned so that the distances in the radial direction of the blowing pipe 8 are all different from each other as l ₁ , l ₂ , l ₃ , and l ₄ as shown in FIG. The openings 15a, 15b, 15c, and 15d are each filled with an air-permeable refractory material 16 such as ceramic.

Then, the blowing pipe 8 is suspended in the molten metal tank 1, the inclined blades 12a, 12b, 12c, and 12d are immersed in the molten metal 17, and then the blowing pipe 8 is rotated at a low speed by driving with the motor 4 through the pulleys 6 and 9. (100-150rpm). Then, pressurized refining gas is blown into the blowing pipe 8. The refining gas passes through the lower end of the blowing pipe 8, passes through each hollow passage 14a, 14b, 14c, 14d inside the four inclined blades 12a, 12b, 12c, 12d, and enters each opening 15a, 15b, 15c, 1 on the lower surface thereof.
It reaches 5d. and breathable refractories 16, 16, 1
The refining gas is made into fine bubbles and ejected into the molten metal by passing through the fine voids of several microns possessed by the refining gas. At this time, the inclined blade 12
a, 12b, 12c, and 12d are rotating in the molten metal 17, and the ejected small bubbles immediately leave the surface of the air-permeable refractory 16 as small bubbles due to relative friction with the molten metal. That is, the bubbles diffuse into the molten metal soon after they grow large. Therefore, the small bubbles circulate uniformly in the bath as shown in the figure. In addition, the blowing pipe 8 rotates at a low speed (100 to 150 rpm) as described above.
Therefore, there is little possibility that oxides accumulated on the upper surface of the molten metal 17 will be involved.

[Effects of the Invention] As described above in the embodiments, according to the present invention, fine bubbles of refining gas can be ejected downward in many lines from the lower surface of the rotating inclined blade. As a result, there is an advantage that the refining gas can be uniformly circulated within the molten metal and refining can be carried out effectively.

[Brief explanation of drawings]

Fig. 1 is a partially sectional front view of a gas equipment for aluminum refining showing an embodiment of the present invention, Fig. 2 is an enlarged bottom view of its inclined blades, Fig. 3 is an enlarged sectional view thereof, and Fig. 4 is an enlarged sectional view of the inclined blade.
The figure is an enlarged side view showing a part thereof in section. 8...Blowing pipe, 12a, 12b, 12c, 12
d... Inclined blade, 15a, 15b, 15c, 15
d...opening, 16...breathable refractory, 17...molten aluminum, _l1 , _l2 , _l3 , _l4 ...radial distance from the blowing pipe.

Claims (1)

[Scope of utility model registration request] A plurality of inclined blades that cause the molten metal to flow downward through rotation are provided at the lower end of the blowing pipe, and openings communicating with the inside of the blowing pipe are provided on the lower surface of each inclined blade at different radial distances from the blowing pipe. A gas blowing device for aluminum refining, characterized by having an opening filled with a breathable refractory.