JP2001020020A - Method for cooling aluminum dross - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently execute the cooling of Al dross and the recovery of Al metal by continuously supplying the Al dross into a double structural rotary drum, indirectly water-cooling in the drum under Ar gas atmosphere and continuously discharging the cooled material. SOLUTION: The Al dross is continuously supplied into a rotary drum 11. Cooling water is spread onto the outer peripheral surface of an inner cylinder 21 from nozzles 28 through a cooling water supplying pipe 27 arranged at a hollow part between the inner cylinder 21 and an outer cylinder 22 in the rotary drum 11, and the spread cooling water is drained from a drainage hole 29 arranged at the outer cylinder 22. Gaseous Ar is supplied into the inner cylinder 21 from an opening hole 31 arranged at the inner cylinder 21 and exhausted from an exhausting hole 15 at a supplying chamber 12. In such a way, the Al dross continuously supplied into the inner cylinder 21 is indirectly water-cooled under Ar gas atmosphere while feeding it from the one end part to the other end part in the inner cylinder 21. When the inner cylinder 21 is rotated and one of an opening part 32 arranged in the extension part is communicated with an opening part 34 in a cover 33, the cooled material is dropped by gravity into a discharging chamber 35 and finally, discharged by opening a discharging door 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for cooling aluminum dross. When aluminum or its alloy is melted, dross floats on its surface. When pouring the molten aluminum or its alloy into a mold, the dross is removed in advance to prevent the dross on the surface from being caught. About 6 for the dross
Because it contains 0-80% aluminum metal,
The dross is primarily squeezed to recover aluminum metal from the dross. Approximately 40-60% of dross residue ash after recovering aluminum metal from dross by primary squeezing
The dross residual ash is secondarily squeezed to recover the aluminum metal from the dross residual ash. When recovering aluminum metal from such dross or dross residue ash, it is cooled for convenience of the recovery operation. The present invention relates to an improvement in a method for cooling dross or dross ashes (in the present invention, these are referred to as aluminum dross).

[0002]

2. Description of the Related Art Conventionally, as a method of cooling an aluminum dross, a method of cooling an aluminum dross in a container, a method of supplying an aluminum dross in a rotating drum, and the like have been used. In each of these conventional methods, the cooling of the aluminum dross is performed in the atmosphere. However, according to such a conventional method, the aluminum metal contained in the aluminum dross is oxidized and nitrided during cooling, so that the heat generated by the oxidation and nitridation reduces the efficiency of cooling the aluminum dross, and the recovery rate of the aluminum metal. There is a problem that is bad.

[0003]

The problem to be solved by the present invention is that in the conventional method, the aluminum metal contained in the aluminum dross is oxidized and nitrided during cooling, so that the heat generated by the oxidation and nitridation is generated. Therefore, the cooling efficiency of the aluminum dross is low, and the recovery rate of the aluminum metal is low.

[0004]

According to the present invention, an aluminum dross is continuously supplied into a rotating drum having a double structure, and the aluminum dross is indirectly water-cooled under an argon gas atmosphere in the rotating drum. And a method of cooling the aluminum dross, wherein the cooled material is continuously discharged from the rotating drum.

In the present invention, first, aluminum dross is continuously supplied into a rotating drum having a double structure. For example, a supply chamber is connected to one end of a rotating drum, and the supply chamber has an inlet,
Open an exit and an exhaust port, provide an entrance door at the entrance, and an exit door at the exit, close the exit door when opening the entrance door, and close the entrance door when opening the exit door. I do. A first feeder for supplying aluminum dross to the supply chamber is provided facing the inlet, and a second feeder for supplying aluminum dross supplied to the supply chamber into the rotary drum is provided at the bottom of the supply chamber. A seal is provided between the rotary drum and the peripheral edge of the outlet facing the rotary drum. In such a configuration, the entrance door is opened → the first feeder supplies aluminum dross to the supply chamber → the entrance door is closed → the exit door is opened → the second feeder supplies aluminum dross from the supply chamber into the rotary drum → exit door , And the above operation is repeated to continuously supply the aluminum dross into the rotating drum having the double structure.

Next, in the present invention, the aluminum dross continuously supplied to the rotating drum having the double structure is indirectly water-cooled in the rotating drum under an argon gas atmosphere. For example,
The rotating drum is formed in a double structure with an inner cylinder and an outer cylinder surrounding the inner cylinder, and the outer cylinder is connected to a driving means to rotate the inner cylinder and the outer cylinder simultaneously. Then, the cooling water supply pipe inserted into the inner cylinder is taken out from the axis portion at the other end of the inner cylinder between the inner cylinder and the outer cylinder, and extended, and a plurality of nozzles are provided in the cooling water supply pipe. The cooling water is sprayed from these nozzles to the outer peripheral surface of the inner cylinder, and the sprayed cooling water is drained from a drain port provided at the other end of the outer cylinder, while the cooling water is sprayed to an axial portion at the other end of the inner cylinder. Argon gas is supplied into the inner cylinder from the provided opening, and the supplied argon gas passes through the inner cylinder and is exhausted from an exhaust port of the charging chamber connected to one end of the inner cylinder. In such a configuration, the aluminum dross continuously supplied into the inner cylinder is
While being sent from one end to the other end in the inner cylinder, indirect water cooling is performed in an argon gas atmosphere.

[0007] Finally, in the present invention, the cooled aluminum dross water-cooled indirectly in an argon gas atmosphere in a double-structured rotating drum is continuously discharged from the rotating drum. For example, at the other end of the double-structured rotary drum, only the inner cylinder is extended, and slit-shaped openings along the axial direction are provided at predetermined intervals on the peripheral surface of the extended portion of the inner cylinder. A cover for covering these openings is attached to the outer peripheral surface of the extended portion of the inner cylinder, a slit-shaped opening is separately provided at the lower portion of the cover, and a discharge chamber having a discharge door is connected to the lower portion. In such a configuration, when one of the openings provided in the extended portion of the inner cylinder rotates and communicates with the opening of the cover, the cooling material falls by its own weight from these openings to the discharge chamber. When the opening provided in the extending portion of the inner cylinder and the opening of the cover are not in communication, the discharge door of the discharge chamber is opened to discharge.

In the present invention, since the aluminum dross is continuously cooled indirectly in an argon gas atmosphere, the aluminum metal contained in the aluminum dross is not oxidized or nitrided during cooling. The cooling efficiency of the aluminum dross is good and the recovery rate of the aluminum metal is good because there is no heat generated by nitriding.

[0009]

FIG. 1 is an overall view schematically showing an embodiment of the present invention in a partially omitted longitudinal section. A supply chamber 12 is connected to one end of the rotating drum 11, and the supply chamber 12 has an inlet 13, an outlet 14, and an exhaust port 15,
The entrance 13 is provided with an entrance door 16, and the exit 14 is provided with an exit door 17. Entrance door 16 and exit door 17
When the entrance door 16 is opened, the exit door 17 is closed, and when the exit door 17 is opened, the entrance door 16 is closed. Aluminum dross supply chamber 1 facing entrance 13
A first vibrating conveyor 18 for supplying the aluminum dross supplied to the supply chamber 12 to the inside of the rotary drum 11 is provided at the bottom of the supply chamber 12. Have been. The outlet 14 is opened facing the inside of the rotating drum 11, and the space between the periphery of the outlet 14 and the rotating drum 11 is sealed. In the illustrated embodiment, the entrance door 16 is opened → the first vibration conveyor 18 supplies aluminum dross to the supply chamber 12 → the entrance door 16 is closed → the exit door 17 is opened → the second vibration conveyor 19 supplies aluminum dross. From the step 12, the charging is performed into the rotating drum 11, and the exit door 17 is closed.

The rotary drum 11 is formed in a double structure with an inner cylinder 21 and an outer cylinder 22 surrounding the inner cylinder 21, and ring-shaped large gears 23, 24 are mounted on the outer peripheral surface of the outer cylinder 22. The large gears 23 and 24 mesh with small gears 25 and 26 attached to a motor-driven rotating shaft. By motor drive, through small gears 25 and 26 and large gears 23 and 24,
The outer cylinder 24 and the inner cylinder 23 rotate simultaneously. The hollow portion between the inner cylinder 21 and the outer cylinder 22 has an inner cylinder 21
A cooling water supply pipe 27 inserted into the inner cylinder 21 from the axial portion at the other end of the cooling water supply pipe 27 is taken out of the hollow part, is branched and extends, and the cooling water supply pipe 27 has a plurality of nozzles 28. Installed. The cooling water supplied through the cooling water supply pipe 27 is sprayed from these nozzles 28 to the outer peripheral surface of the inner cylinder 21, and the sprayed cooling water is drained from a drain port 29 provided at the other end of the outer cylinder 22. It has become. An opening 31 is provided in the axis portion at the other end of the inner cylinder 21, and the argon gas supplied from the opening 31 into the inner cylinder 21 is connected to one end of the inner cylinder 21 through the inner cylinder 21. Air is exhausted from the exhaust port 15 of the charging chamber 12. In the illustrated embodiment, as described above, the aluminum dross continuously supplied into the inner cylinder 21 is indirectly water-cooled in an argon gas atmosphere while being sent from one end to the other end in the inner cylinder 21.

At the other end of the rotary drum 11 having a double structure, the inner cylinder 21 extends from the outer cylinder 22. A plurality of slits are formed on the peripheral surface of the extension of the inner cylinder 21 along the axial direction thereof. Openings 32 are provided at predetermined intervals. Opening 32
A cover 33 having a slit-shaped opening 34 at the lower portion is bearing on the outer peripheral surface of the inner cylinder 21 provided with the cover 33. The cover 33 is in sliding contact with the outer peripheral surface, and the slit-shaped A discharge chamber 35 communicating with the opening 34 is formed. The cylindrical container 36 forming the discharge chamber 35 is connected to the cover 33 and has a discharge door 37 at the bottom. The extended portion of the inner cylinder 21 provided with the opening 32 is surrounded by an enclosure 38, and the space between the enclosure 38 and the other end of the outer cylinder 22 is sealed. The enclosure 38 includes a discharge chamber 35.
Is attached, and the discharge door 37 is taken out of the enclosure 38 and the enclosure 3
8 is provided with an argon gas supply port 39 on the wall surface.
In the illustrated embodiment, when the inner cylinder 21 rotates and one of the openings 32 provided in the extending portion thereof communicates with the opening 34 of the cover 33, the discharge chamber 35 is opened from the opening 32 through the opening 34.
The cooling material falls under its own weight to the inner cylinder 21.
When the opening 32 provided in the extension of the cover 33 is not in communication with the opening 34 of the cover 33, the discharge door 37 is opened to discharge.

[0012]

As is apparent from the above description, the present invention described above has a high cooling efficiency for aluminum dross because the aluminum metal contained in aluminum dross is not oxidized or nitrided during cooling. The effect is that the recovery rate is also good.

[Brief description of the drawings]

FIG. 1 is an overall view schematically showing an embodiment of the present invention in a partially omitted longitudinal section.

[Explanation of symbols]

11. rotary drum, 12 supply chamber, 16 inlet door, 17 outlet door, 21 inner cylinder, 22 outer cylinder, 2
7. Cooling water supply pipe, 32 opening, 33 cover
35 discharge chamber, 37 discharge door, 38 enclosure, 3
9. Argon gas inlet

Claims (1)

[Claims] 1. An aluminum dross is continuously supplied into a rotating drum having a double structure, and indirectly water-cooled in the rotating drum under an argon gas atmosphere, and the cooled product is continuously discharged from the rotating drum. A method for cooling aluminum dross.