JPH05215464A - Scrap melting and separating device - Google Patents

Abstract

PURPOSE:To enhance a thermal efficiency and to raise a removing efficiency of adhered oil content when metal having a low melting point is recovered and separated as melted metal from different type metal mixture scrap by utilizing a difference of melting points of metals. CONSTITUTION:A burner 3 is opposed directly to a rotary kiln 10, and a lift plate 15 is mounted circumferentially in the kiln. For example, when mixture scrap of aluminum and iron is charged in the kiln 10, the aluminum is efficiently melted by a direct flame, transmitted along a lowermost surface in the kiln 10, and, dropped from screens 18a, 18b. On the other hand, since heating of the burner 3 is so maintained that the iron is not heated to its melting point or higher, the iron is repeatedly scraped up and dropped by the plate 15 and discharged from the screens 18a, 18b or an outlet 16. In this case, adhered oil content of scrap is effectively burned due to direct flame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes use of the difference in melting point of metals from scraps of heterogeneous metals such as iron and aluminum, such as scrap cars, household electrical equipment scraps, and return materials with iron in the aluminum casting process. The present invention relates to an apparatus for collecting and separating a metal having a melting point as a molten metal.

[0002]

2. Description of the Related Art An apparatus of this type is disclosed in U.S. Pat. No. 3,401,925. This one is equipped with a cylindrical retort that can be rotated with the outlet side tilted downward, and is put into the rotating retort from the inlet side, moved to the outlet side while rotating and stirring, and is rotated from the outer surface of the retort. The object to be treated is heated with heat.

In this action, for example, when the object to be treated is a mixture of iron and aluminum, if the heating state is set to the melting point of aluminum or higher and the melting point of iron or lower, the aluminum melts and becomes a molten metal, and the screen at the outlet transfers it to the container. Pouring, on the other hand, the iron does not melt and is sent from the outlet into another container.

However, since this technique is indirect heating through the peripheral wall of the retort, there are many problems in terms of thermal efficiency. Further, when the object to be treated is, for example, a scrap car, the oil content adhering to the object is smoldered and an offensive odor is generated, which causes a problem in exhaust gas treatment.

In view of the above points, it is an object of the present invention to improve the thermal efficiency and to enable the treatment of oil content at the same time when the metal is melted.

[0006]

In order to solve the above problems, according to the present invention, a long cylindrical rotary kiln is installed with its outlet side inclined downward, and a heating burner is directly exposed to this rotary kiln. In the rotary kiln, lift plates in the lengthwise direction are floated from the inner surface and are provided at required intervals in the circumferential direction, and a screen for extracting molten metal is formed on the entire circumference before the exit of the rotary kiln.

[0007]

In the scrap melting and separating apparatus according to the present invention having the above-mentioned structure, when the burner is ignited while the rotary kiln is rotated and a heterogeneous mixed metal scrap, for example, a mixed scrap of aluminum and iron is charged into the rotary kiln, the scrap is removed. Moves to the outlet side while being heated.

At this time, if the inside of the rotary kiln is kept above the melting point of aluminum but below the melting point of iron, the aluminum will melt and become molten metal during its movement, and will fall from the screen on the outlet side along the lowermost portion of the inner surface of the rotary kiln. The molten metal that falls is received in a container, holding furnace, etc.

On the other hand, iron is not melted but is repeatedly scraped up and dropped by the lift plate in the rotary kiln, and is repeatedly moved to the outlet side and discharged. In this way, aluminum is separated from iron as molten metal in the rotary kiln. The position and shape of the lift plate are appropriately set so that the dropping position of the iron does not become the passage of the molten aluminum.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a rotary kiln 10 is provided with an outlet 16 on a base frame F via left and right support rollers 1.
It is installed with the side tilted downward. The support roller 1 has two rolls 1a in the front and rear in the circumferential direction of the kiln 10, the iron tires 11 of the kiln 10 are mounted on both rolls 1a, and one of the rolls 1a of one of the support rollers 1 is a motor (not shown). The kiln 10 rotates via the tire 11 by rotating the kiln 10.

The rotary kiln 10 is made of a heat-resistant member having a total length of 6.6 m, and a hood 2 made of refractory bricks is provided at an inlet 12 thereof. Main burner 3 in this hood 2
Is attached, and its crater faces the inlet 12. The burner 3 raises and maintains the temperature inside the kiln 10 at a temperature above the melting point of aluminum but below the melting point of iron. A vibrating feeder 4 is installed on the frame F at the entrance 12, and scraps such as scrapped vehicles are thrown into the kiln 10 by vibrating force from the feeder 4. Scrap is carried into the hopper of the vibrating feeder 4 from the overhead crane 4a or the like (see FIG. 3).

A spiral blade 13 is provided on the inner surface of the rotary kiln 10 on the inlet side, and scraps introduced by the blade 13 are sent forward. Therefore, entrance 1
No scrap will stay in No.2. Further, a caster lining 14 is stretched from the inner surface entrance of the rotary kiln 10 by a refractory brick or the like for a required length.
The length of the lining 14 (the length direction of the kiln 10) is appropriately selected in consideration of the heat from the burner 3. Preferably, it is stretched over the entire length of the inner surface of the kiln 10.

From the inner surface of the rotary kiln 10,
The lift plate 15 in the axial direction is fixed in a state of floating from the inner surface of the lift plate 15 via the legs 15a. The length, the cross-sectional shape (FIG. 2), the circumferential position and the number of the lift plate 15 are appropriately selected so that scrap scraped up does not drop near the lowermost inner surface of the kiln 10. As a result, the molten aluminum described below can smoothly flow near the lowermost surface in the kiln 10. The height of the leg 15a is determined in consideration of the flow amount. If the lift plate 15 has a slightly spiral shape, it promotes the advancing action of scrap.

The outlet 16 of the rotary kiln 10 is opened and closed by a lid 17 which is moved by a hydraulic cylinder (not shown), and the entire circumference of the kiln 10 in front of the outlet 16 is a perforated screen 1.
8a and 18b. A large number of 10 mmφ circular holes are formed in one screen 18a, and the molten metal from the inlet 12 side first drops from this screen 18a. On the other screen 18b, a large number of 9 × 45 mm long holes are formed,
Molten metal passing through the screen 18a and the screen 18
The molten metal drops when a is clogged. By providing these two types of screens 18a and 18b, it is possible to know the degree of clogging of the screen 18a from the position where the molten metal falls.

Around the screens 18a and 18b, a hood 5 made of refractory brick is provided on the frame F, and its exhaust port 5a is provided with a fire damper 30, a cyclone 31, a bag filter 32, etc., as shown in FIG. An exhaust fan 33 is connected, and the exhaust gas in the kiln 10 is collected by the intake air of the exhaust fan 33 and then discharged from the chimney 34 to the outside air.

Screens 18a, 18 in the hood 5
A molten metal receiver 6 is provided laterally below b.
Faces the inlet of the holding furnace 7. The trough portion of the receiver 6 is covered with a cover 6a with a burner to prevent the molten metal from cooling. The molten metal is carried by the container C from the holding furnace 7 to an appropriate place.

A chute 8a facing downward is provided behind the molten metal receiver 6 in the hood 5, and a screen 18a,
The scrap passing through 18b passes through the chute 8a and drops onto the vibration conveyor 9. A chute 8b is provided below the exit 16 and scraps from the exit 16 drop onto the vibration conveyor 9 through the chute 8b. The vibrating conveyor 9 is provided with a screen part, and after fine parts are removed by this screen part,
The undissolved scrap is carried by the container C to an appropriate place.

In the figure, TICA is a temperature indicating control alarm, T
IC is a temperature indicating controller, PICA is a pressure indicating alarm, FA is a flow alarm, FQ is a fuel integrating meter, FD is a flow adjusting damper, the dotted line indicates the control system, and its control is appropriately controlled by a computer. To do. Further, 19 is an auxiliary burner, which is used at the start of work and stops when the inside of the kiln 10 reaches a constant temperature. 20 is a blower for secondary air.

This embodiment is constructed as described above, and its operation will be described below.

Now, when the burners 3 and 19 are ignited while the rotary kiln 10 is rotated and the internal temperature reaches the required temperature, a mixed scrap of aluminum and iron is put into the rotary kiln 10, and the scrap is heated and exits. Move to the side. At this time, rotary kiln 1
The inside of 0 is kept above the melting point of aluminum and below the melting point of iron. During the movement, aluminum melts into a molten metal, which travels along the lowermost surface in the rotary kiln 10 and drops from the screen 18a or 18b on the outlet 16 side, It is stored in the holding furnace 7 through the molten metal receiver 6.

On the other hand, the residual scrap of iron or the like does not melt or becomes a large lump, and becomes a rotary kiln 10.
Inside the chute 8a, fine particles move to the exit 16 side while repeatedly being lifted up and dropped by the lift plate 15.
Then, a large one falls through the chute 8b and falls on the vibration conveyor 9.

At the time of this operation, since the heating is performed directly, the thermal efficiency is good, and the oil and the like adhering to the scrap is burned by the direct flame, and the post-treatment is easy.

[0023]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above and is based on direct heating, the heat efficiency is good, the workability is improved, and the oil adhering to the scrap is surely burned, and the post-treatment is easy. It will be

[Brief description of drawings]

FIG. 1 is a schematic sectional front view of an embodiment.

FIG. 2 is a schematic cut right side view of the embodiment.

[FIG. 3] Facility explanatory diagram of the same embodiment

[Explanation of symbols]

 1 Support Roller 2 Hood 3 Main Burner 4 Vibratory Feeder 5 Hood 5a Exhaust Port 6 Molten Metal Holder 7 Holding Furnace 8a Chute 8b Chute 9 Vibratory Conveyor 10 Rotary Kiln 11 Iron Tire 12 Inlet 13 Spiral Blade 14 Castor Lining 15 Lift Plate 16 Exit 18 17 Lid , 18b Screen 19 Auxiliary burner 20 Secondary air blower F frame C container

Claims (1)

[Claims] 1. A long cylindrical rotary kiln is installed with its outlet side inclined downwards, a heating burner is directly faced to this rotary kiln, and a lift plate in the lengthwise direction is floated from the inner surface in the rotary kiln. A scrap melting and separating device, which is provided at required intervals and has a screen for extracting molten metal around the entire circumference of the rotary kiln exit.