JPH06145834A - Melting furnace for aluminum cans - Google Patents

Abstract

PURPOSE:To provide a melting furnace for aluminum can by which the aluminum can easily be melted and whose structure is simple. CONSTITUTION:In a melting chamber 20 fitted with a burner for melting and storing molten aluminum by melt the aluminum can in non-oxidizing atmosphere, in the melting furnace for melting aluminum can used to refreshing drink, etc., a cylindrical body 14 is inserted into a heating space part of the melting furnace so that the lower end of the cylindrical body 14 charging and packing the aluminum can positions at the upper part near the molten aluminum storing surface 18.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an aluminum can melting furnace,
More specifically, it relates to a melting furnace for aluminum cans that melts aluminum cans used for soft drinks and the like.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of environmental protection and effective use of resources, aluminum cans used for soft drinks have been recycled. By the way, an aluminum can that is recycled is usually re-melted and then re-refined for use. Therefore, since the aluminum can needs to be transported to a predetermined place where it is melted, it is transported after being crushed in order to improve transportation efficiency.

[0003]

By crushing the aluminum cans and then transporting them as described above, the transport efficiency can be significantly improved as compared with the case where the aluminum cans are transported without crushing. However, since the volume of the crushed aluminum can is still large compared to the volume of molten aluminum,
In order to further improve the transportation efficiency, it is desired to melt an aluminum can into an aluminum ingot such as an ingot. In addition, if the molten aluminum obtained by melting the aluminum cans can be used for the casting crafts in the crafts class related to the casting crafts that has recently been prosperous, the recycling use of the aluminum cans can be promoted. Therefore, an object of the present invention is to provide a melting furnace for an aluminum can, which can easily melt the aluminum can and has a simple structure.

[0004]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the inventors of the present invention first heated an aluminum can in the atmosphere as a molten glass, and after the paint and the like applied to the aluminum can decomposed. However, white aluminum oxide was formed on the surface of the aluminum can, and the aluminum can could not be easily melted. On the other hand, it was found that the aluminum can can be easily melted without producing aluminum oxide by heating the aluminum can in a substantially non-oxygenated atmosphere by flowing nitrogen gas. Therefore, the present inventors, as a result of further studies based on these findings,
It was found that the aluminum can can be easily melted by inserting the tubular body into the heating space so that the lower end of the tubular body into which the aluminum can is placed is near the upper side of the storage surface of the molten aluminum. Arrived

That is, the present invention relates to an aluminum can melting furnace for melting aluminum cans used for soft drinks,
In the lower part of the melting furnace, a melting burner for heating and melting an aluminum can is installed, and a melting chamber for storing molten aluminum is provided, and the lower end of a cylindrical body for charging and charging the aluminum can is the melting chamber. In the melting furnace for aluminum cans, the tubular body is inserted into the heating space of the melting furnace so as to be located above and near the storage surface of the molten aluminum stored in the melting furnace. Further, the present invention is a melting furnace for aluminum cans that melts aluminum cans used for soft drinks, etc., and a melting burner for heating and melting the aluminum cans is attached and melted at the bottom of the melting furnace. A melting chamber for storing aluminum is provided, and a cylindrical body for charging / filling the aluminum can is inserted into the heating space of the melting furnace, and at the lower end of the cylindrical body on the melting chamber side, there is no melting aluminum. The melting furnace for an aluminum can is also characterized in that a cylindrical body made of a heat-resistant material such as graphite having affinity and heat resistance is inserted.

[0006]

According to the present invention, the aluminum can charged and filled in the tubular body can be heated and melted while removing the paint and the like applied to the aluminum can. In other words, put it in a tubular body
The filled aluminum can descends while being heated by the heat from the heating atmosphere heated by the melting burner. During that time, the aluminum can is heated under substantially non-oxygen, so that aluminum oxide is not generated on the surface of the can. Therefore, the aluminum can reaching the storage surface of the molten aluminum existing near the lower end of the tubular body is immediately melted. Also, while descending in the tubular body, the paint, water, etc. applied to the aluminum can are scattered by thermal decomposition, evaporation, etc., and when the aluminum can is melted, the applied paint, etc. Can be fully removed. Furthermore, by inserting a cylinder made of a heat-resistant material such as graphite, which is incompatible with molten aluminum and has heat resistance, into the lower end of the cylindrical body on the side of the melting chamber, the highest temperature part is kept in contact with the molten aluminum. A tubular body made of an affinity and heat-resistant material can be used, and a drop failure of the aluminum can due to fusion between the inner wall surface of the tubular body and the aluminum can can be prevented.

[0007]

EXAMPLES The present invention will be described in more detail by way of examples. FIG. 1 is a vertical sectional view showing an embodiment of the present invention.
The melting furnace shown in FIG. 1 is composed of a melting part 10 and a communication part 12 provided in the lower part. Melting part 10 and communication part 12
In each of the above, a heat resistant heat insulating material 20 such as rock wool is mounted inside an iron cylinder 22. The communication section 12 is
The melting chamber 20 formed in the melting unit 10 and the communication chamber 22 are positioned and placed on the upper portion of the melting unit 10 so as to communicate with each other. Such positioning of the communication portion 12 is performed by the L-shaped angle 28 provided on the upper surface of the fusion portion 10. In addition, as shown in FIG. 2, the melting portion 10 is provided with a mounting hole 16 on the inner wall surface for mounting a melting burner, and the molten aluminum is stored on the bottom surface side of the melting chamber 20. A melting burner such as a propane gas burner for heating and melting an aluminum can is mounted in the mounting hole 16.

In the present embodiment, the tubular member 14 made of iron is provided approximately at the center of the melting chamber 20 and the communication chamber 22 which are connected to each other.
Has been inserted. The tubular body 14 is for charging and filling an aluminum can, and the upper portion of the tubular body 14 is positioned so that the lower end thereof is in the vicinity of and above the storage surface 18 of the molten aluminum stored in the melting chamber 20. It is locked to the upper end surface of the communication portion 12 by a locking portion 36 provided on the. Here, the tubular body 1
When the lower end of 4 is brought into contact with the molten aluminum storage surface 18, a part of the aluminum can charged and filled in the tubular body 14 is melted, and is fused to the wall surface of the tubular body 14 to form the aluminum can. This is because a fall failure or the like occurs. Further, in the melting furnace of this embodiment, a combustion tube 30 is provided above the communication part 12.
This combustion cylinder 30 is for completely burning the decomposition gas and the like generated from the paint applied to the aluminum can charged and filled in the cylindrical body 14 to prevent the generation of black smoke. Therefore, in order to sufficiently supply the air into the combustion cylinder 30, a gap is provided between the communication portion 12 and the combustion cylinder 30.

In order to melt an aluminum can by using the melting furnace of this embodiment shown in FIG. 1, the melting burner mounted in the mounting hole 16 is ignited so that the temperature inside the melting chamber 20 is controlled by the aluminum can. Heat to melt temperature. Next, when an aluminum can is charged and filled into the tubular body 14, the aluminum can is heated and gradually softened and descends, and when it reaches the molten aluminum storage surface 18, it is immediately melted. In addition, when molten aluminum does not exist in the melting chamber 20 at the start of melting of the aluminum can, it takes some time until the molten aluminum is stored. By placing the molten aluminum, the molten aluminum can be stored at an early stage, and the melting rate of the aluminum can can be quickly brought to a steady rate. As described above, in this embodiment, since the aluminum can reaching the storage surface 18 of the molten aluminum is immediately melted, the aluminum can charged and filled in the tubular body 14 is substantially non-oxygenated. It is heated. This means that when an aluminum can is heated in an oxygen atmosphere, the surface of the aluminum can is oxidized and aluminum oxide is produced, so the aluminum can cannot be easily melted even if heated above the melting temperature of aluminum. Is clear from.

Further, the paint applied to the aluminum can, residual water, and the like are scattered by thermal decomposition and evaporation when descending in the tubular body 14, so that impurities such as carbon are mixed in the molten aluminum. Can be prevented. Therefore, the molten aluminum stored on the bottom surface side of the melting chamber 20 is clean without carbon and the like, and a required amount of molten aluminum is supplied from a molten aluminum outlet (not shown) provided in the melting chamber 20. Can be extracted. The molten aluminum extracted from the melting furnace can be molded into a molded product having a predetermined shape by pouring it into a mold that has been molded in advance, and can be used for casting crafts or education. Further, it may be formed into an ingot shape that is convenient for transportation to a refining factory so as to be purified and recycled. The decomposed gas such as paint is discharged from the upper end of the cylindrical body 14 and completely burned in the combustion cylinder 30, so that black smoke can be prevented from being discharged when the aluminum can is melted.

In the melting furnace shown in FIGS. 1 and 2, an iron tubular body is used as the tubular body 14, so that the tubular body 14 that passes through the heating space portion at the highest temperature in the vicinity of the melting burner has a tubular shape. It was found that an alloy of iron and aluminum was generated and the thickness of the tubular body 14 was likely to be thin. Therefore, as shown in FIG. 3, the portion to be inserted into the melting chamber 20 is
By using the tubular body 32 made of graphite, it is possible to prevent the tubular body 14 from being thinned due to the formation of the aluminum alloy. The cylindrical body 32 is erected on the bottom surface of the melting chamber 20, and is provided with a plurality of notches 34 on the bottom surface side so that molten aluminum can flow in and out, and at the upper end portion of the cylindrical body 32. The lower end of the tubular body 14 made of iron is inserted. This cylinder 32
Since it has no affinity for molten aluminum and has good heat resistance, it can be immersed in molten aluminum, and the molten aluminum storage surface 18 is placed near the lower end of the tubular body 14 inserted into the tubular body 32. Can be raised up to. Although the cylindrical body 32 shown in FIG. 3 is not provided with a bottom portion, it may be in the form of a pot with a bottom portion.

In the melting furnace shown in FIGS. 1 to 3, a single cylindrical body 14 was provided. However, when it is desired to enhance the melting capacity of the aluminum can, as shown in FIG. It is advantageous to provide a plurality of tubular bodies 14. Even if the diameter of the tubular body 14 is enlarged and the amount of aluminum cans charged and filled in the tubular body 14 is simply increased, the aluminum cans near the center of the tubular body 14 are sufficiently heated. However, since the paint and the like are insufficiently removed, the melting rate of the aluminum can cannot be substantially improved. In the melting furnace shown in FIG. 4, a melting chamber 2 having a mounting hole 16 in which a melting burner is mounted is provided.
A cylindrical body 32 made of graphite is erected on the bottom surface of 0, and the lower end of the cylindrical body 14 is inserted into the upper end of the cylindrical body 32.
The cylindrical body 32 is in the shape of a pot having a bottom, and an inlet / outlet hole 40 for letting molten aluminum in and out is provided near the bottom. Therefore, the molten aluminum remains at the bottom of the tubular body 32, but even if the residual molten aluminum solidifies, the molten aluminum is melted at the start of the next operation and the molten aluminum is stored in the lower portion of the tubular body 14 early, and the operation is restarted. The rising time at the start can be shortened.

Also in the melting furnace shown in FIG. 4, in order to easily discharge the slag generated in the cylindrical body 14 and the cylindrical body 32, the bottom of the vase-shaped cylindrical body 32 is cut and melted in a cylindrical shape. A gap may be provided between the bottom surface of the chamber 20 and the lower end of the tubular body 32. In this case, the lower end of the cylindrical body 32 may be immersed in the molten aluminum, or the position may be adjusted so as to be located above the vicinity of the storage surface of the molten aluminum. Incidentally, the tubular body 3
As shown in FIG. 4, since No. 2 cannot be directly placed on the bottom surface of the melting chamber 20, it is necessary to provide a support tool for supporting the tubular body 32 on the furnace wall surface. As described above, in this embodiment,
Charcoal or the like may be put in advance in the melting chamber 20 in order to quickly bring the reducing chamber into the reducing atmosphere and improve the melting efficiency.

[0014]

According to the present invention, an aluminum can for recycling can be melted to form an ingot-shaped aluminum lump, and the transport efficiency of the aluminum can can be remarkably improved. Furthermore, since the paint or the like applied to the aluminum can has been removed, the aluminum can be easily purified, and the aluminum can can be recycled and used further.
Moreover, since the structure of the melting furnace is simple and transportable,
Aluminum cans can be used as raw materials for casting and craft classes and school education. Especially in school education, you can easily make handprints, etc., so you can actually experience manufacturing castings and recycling aluminum cans.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a fusion zone 10 shown in FIG.

FIG. 3 is a partial sectional view showing another embodiment of the present invention.

FIG. 4 is a vertical sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Melting part 12 Communication part 14 Cylindrical body 16 Melting burner device hole 18 Molten aluminum storage surface 20 Melting chamber 22 Communication chamber

(72) Inventor Ryoji Sakata 1503-17 Hirashiba, Nagano City, Nagano Prefecture (72) Inventor Fumitake Nishiyama Nagano City, Nagano Prefecture 2-2-3 Tamba Island (72) Inventor Hideki Maruyama Nagano City, Nagano Prefecture Azumiri Isemiya 2420-235 (72) Inventor Kenji Shimakura 2-111-1, Ueno, Nagano City, Nagano Prefecture

Claims (2)

[Claims] 1. A melting furnace for an aluminum can that melts an aluminum can used in soft drinks and the like, and a melting burner for heating and melting the aluminum can is attached to the lower part of the melting furnace and the melting aluminum is used. Is provided, and the tubular body is melted so that the lower end of the tubular body for charging / filling the aluminum can is near and above the storage surface of the molten aluminum stored in the melting chamber. A melting furnace for aluminum cans, which is inserted into the heating space of the furnace. 2. A melting furnace for an aluminum can, which melts an aluminum can used for soft drinks, etc., and a melting burner for heating and melting the aluminum can is attached to the lower part of the melting furnace and the melting aluminum is used. Is provided with a melting chamber in which the aluminum can is charged and filled, and the cylindrical body for charging and filling the aluminum can is inserted into the heating space of the melting furnace, and the lower end of the cylindrical body on the melting chamber side is incompatible with molten aluminum. A melting furnace for aluminum cans, in which a cylindrical body made of a heat-resistant material such as graphite having heat resistance and heat resistance is inserted.