JP2003129138A - Recycling method for end-of-life vehicle or waste electrical household appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recycle end-of-life vehicles and waste electrical household appliances generating in large quantities, as iron sources, without shredding them, namely, without generating shredder dusts. SOLUTION: When melting pressed scrap of end-of-life vehicles or scrap of waste electrical household appliances provided from the unshredded end-of-life vehicles or waste electrical household appliances, by using a melting facility 1 having a melting chamber 2 provided with a heat source and a shaft type preheating chamber 3 directly connected to the melting chamber, this recycling method includes melting the pressed scrap of end-of-life vehicles or the scrap of waste electrical household appliances in the melting chamber with the heat source, while promoting gassification and burning of combustibles included in the pressed scrap of end-of-life vehicles or the scrap of waste electrical household appliances, by supplying the pressed scrap of end-of-life vehicles or the scrap of waste electrical household appliances to the preheating chamber, as well as supplying an oxygen-containing gas to the melting chamber, so as to maintain a state that the unmelted pressed scrap of end-of-life vehicles or the scrap of waste electrical household appliances exists in the melting chamber and the preheating chamber, and tapping a molten metal 17 when its predetermined amount has generated in the melting chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recycling used automobiles or used electric appliances such as refrigerators and washing machines, and more specifically, to shred used automobiles or used electric appliances. Instead, it relates to a method of recycling as an iron source.

[0002]

2. Description of the Related Art Conventionally, used automobiles are pressed after removing valuable parts such as batteries and tires, shredded after pressing, and reused as iron scraps. During this shredder processing, shredder dust containing plastic, rubber, iron, aluminum, copper, etc. is generated. Approximately 200 kg of shredder dust is generated by shredder processing of one used car of about 1 ton, and about 800,000 ton of shredder dust is generated annually from used cars in Japan. Similarly, used home appliances are shredded after removing the motor, coolant, etc.
0,000 tons of shredder dust is generated from used home appliances. This shredder dust is either landfilled or burned and melted in a waste incinerator.

The landfill disposal requires a large amount of disposal cost because the disposal site is limited, and in the combustion treatment by the incinerator, the ash content and the metal content in the shredder dust remain, and this disposal becomes a problem. Further, in the method of directly gasifying the shredder dust and directly melting the incombustible content, a molten metal containing iron and copper as main components is produced, and this is used as a counterweight after solidification, but the amount used is limited. Yes, the disposal of this bullion becomes a problem.

On the other hand, used automobiles (hereinafter also referred to as "waste cars") are not shredded, and used automobile scraps (hereinafter referred to as "waste car press scraps") are directly processed in a steelmaking melting furnace typified by a converter. The dissolution method is disclosed in JP-A-10-33.
It is proposed in Japanese Patent No. 0821. According to this method
No shredder dust is generated, and plastic, rubber, etc. also serve as a heat source during melting, and scrap car scraps can be efficiently melted. However, this method has a limit to the amount of scrap scraps that can be dissolved. That is, according to the same publication, the amount of scrap scraps of scrap cars that can be loaded into a 250 ton converter can be up to 15 tons (heat scrap: about 10 cars) per heat because of the steel composition. Due to problems such as the method of charging scrap into the furnace and smoke generation during charging, the limit is actually about four scrap cars per heat.

Although it is naturally conceivable to directly insert scrap scraps into an arc melting facility (electric furnace), scrap scraps are large in size (about 0.8 m × 0.8 m × 1.3 m). Since the bulk density of the arc melting equipment is small, it is necessary to open and close the upper lid of the melting chamber every time when scrap car press waste is charged in the normal arc melting equipment.From the viewpoint of productivity of the arc melting equipment and environmental measures, arc melting equipment There is a natural limit to charging equipment.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The number of disused cars generated in Japan is about 5 million per year, and the diffusion rate of home electric appliances may increase, but it will not stagnate. In addition, it is impossible to recycle such a large amount of used automobiles and used home appliances with a conventional technology without shredding with a converter or arc melting facility which is a typical steelmaking melting facility. is there.

The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a method for recycling used automobiles and used home appliances that generate a large amount as an iron source without shredding, that is, without generating shredder dust.

[0008]

The method for recycling used automobiles or used home appliances according to the first aspect of the present invention includes a melting chamber having a heating source and a shaft type preheating chamber directly connected to the melting chamber. When melting scrap car press scraps or waste home appliance scraps obtained without shredding from used automobiles or used home appliances using a melting facility as melting raw material, In order to maintain the state existing in the melting chamber and the preheating chamber, scrap car press scraps or waste home appliance scraps are supplied to the preheating chamber, and oxygen-containing gas is supplied to the melting chamber to combustible materials contained in scrap car press scraps or waste home appliance scraps. Characterized by melting waste car press scraps or waste home appliance scraps in the melting chamber with the heating source while accelerating gasification and combustion of the material, and discharging when a predetermined amount of molten metal is generated in the melting chamber It is intended to.

A second aspect of the present invention is the method for recycling used automobiles or used home appliances according to the first aspect of the present invention, in which oxygen-containing gas is supplied above the molten raw material in the preheating chamber, and scrap car press waste or waste home appliances are used. It is characterized by burning a combustible gas generated from scraps.

According to a third aspect of the present invention, there is provided a method of recycling used automobiles or used home appliances according to the first aspect or the second aspect, wherein the oxygen-containing gas supply amount is adjusted and the exhaust gas temperature at the preheating chamber outlet is adjusted. Is maintained at 400 ° C. or higher, and combustible gas remains in the exhaust gas at the outlet of the preheating chamber.

According to a fourth aspect of the present invention, there is provided a method for recycling used automobiles or used home appliances according to any one of the first to third aspects, wherein the secondary combustion chamber is provided downstream of the preheating chamber. Combustible gas in the exhaust gas,
The exhaust gas temperature is kept at 850 ° C. or higher, and then the exhaust gas is rapidly cooled to 250 ° C. or lower in a cooling chamber provided on the downstream side of the secondary combustion chamber.

According to a fifth aspect of the present invention, there is provided a method for recycling used automobiles or used home appliances according to any one of the first to fourth aspects, wherein the preheating chamber is provided with a pusher, and the pusher is operated. Thus, the melting raw material is supplied from the preheating chamber to the melting chamber.

According to a sixth aspect of the present invention, there is provided a method for recycling used automobiles or used home appliances according to any one of the first to fifth aspects, wherein the heating source is arc heating. Is.

In the first aspect of the present invention, when the waste car press scraps or the waste home electric appliance scraps obtained from the used automobiles or the used home electric appliances without the shredder treatment are dissolved as the melting raw material, the undissolved waste car press scraps or The waste car press scraps or waste home appliance scraps are melted in the melting chamber because the waste car press scraps or waste home appliance scraps are melted while charging the preheating chamber so that the waste home appliance scraps exist in the melting chamber and the preheating chamber. Since it is not directly charged in, it is charged on unmelted scraps of scrap cars or scraps of household appliances, and is preheated with exhaust gas and then supplied into the molten metal.
Volatilization and combustion of combustibles contained in scraps of scraps of used cars and scraps of household electric appliances gradually progress during this preheating, and prevent sudden combustion and smoke emission when scraps of scraps of pressed cars and scraps of household appliances are immersed in the molten metal. You can That is, a large amount of used automobiles or used home appliances can be stably recycled as an iron source without shredding. or,
Oxygen-containing gas is supplied to the melting chamber to promote gasification and combustion of combustibles contained in scrap car press scraps or waste home appliance scraps in the melt chamber and preheating chamber, so scrap car press scraps and waste home appliance scraps are immersed in the molten metal. It is possible to further prevent rapid combustion and smoke generation at the time of performing, so that the amount of generated gas is leveled and a stable melting operation can be performed.

In the second aspect of the present invention, the oxygen-containing gas is supplied above the molten raw material in the preheating chamber to burn the combustible gas generated from scraps of scrap of used cars or scraps of household electric appliances, so that the exhaust gas temperature is maintained at a high temperature. Therefore, the decomposition of dioxins contained in the exhaust gas can be promoted.

In the third aspect of the present invention, since the exhaust gas temperature is kept at 400 ° C. or higher by adjusting the supply amount of the oxygen-containing gas, it is produced by gasification of synthetic resins and rubber contained in scraps of scrap of used cars or scraps of household electric appliances. The tar-based composition can be prevented from solidifying, equipment troubles such as duct clogging can be avoided, and stable melting operation can be performed. However, in order to prevent the tar-based composition from being generated, the exhaust gas temperature is preferably set to 1000 ° C. or higher, which is higher than the decomposition temperature of the tar-based composition.

In the fourth aspect of the invention, the unburned combustible gas is burned in the secondary combustion chamber provided on the downstream side of the preheating chamber and the exhaust gas temperature is kept at 850 ° C. or higher, so that the decomposition of dioxins is continued. Since the concentration of dioxins in the exhaust gas can be made extremely low, and after that, the exhaust gas is rapidly cooled to 250 ° C or less in the cooling chamber provided on the downstream side of the secondary combustion chamber. Synthesis can be prevented, and the concentration of dioxins in exhaust gas can be made extremely low.

In the fifth aspect of the present invention, the preheating chamber is provided with a pusher, and the pusher is operated to supply the melting raw material to the melting chamber. Therefore, the hanging phenomenon of the melting raw material can be avoided, and the melting raw material can be avoided. It becomes possible to stably supply the solution to the dissolution chamber.

In the sixth aspect of the invention, since arc heating is used as the heating source, the amount of heating and the heating rate can be easily controlled, and scraps of scraps of pressed cars or scraps of household electric appliances can be quickly and stably melted.

In the present invention, the scrap car press waste is
Used automobiles from which valuable parts such as engines, batteries, fuel tanks, tires, suspensions, and drive shafts have been removed have been pressed or cut after pressing, and scraps of household appliances are cathode ray tubes for TVs. Used PCBs, such as printed circuit boards, compressors and refrigerant CFCs for refrigerators, compressors, heat exchangers and refrigerant CFCs for air conditioners, motors for washing machines, salt water, etc. If there is no portion to be removed before or after pressing the equipment, the shape of the waste home electric appliance may be the same. Since the outer shell of a home electric appliance has a rectangular parallelepiped shape, and if the size of the home electric appliance is large, most of the home electric appliance can be dissolved in the recycling treatment method of the present invention even if the size is the same, use In the case of a completed home electric appliance, it is preferable to melt it in its shape without pressing it from the viewpoint of reducing the pressing cost. Further, the melting raw material may be only scraps of scraps of pressed cars and scraps of household electric appliances, or may be mixed with ordinary iron scraps or cold iron and other cold iron sources such as direct reduced iron.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. First, the first embodiment will be described. FIG. 1 is a diagram showing an example of a first embodiment of the present invention, a schematic vertical cross-sectional view of an arc melting facility according to the present invention, and FIG. 2 is an exhaust gas connected to the arc melting facility shown in FIG. It is a schematic diagram of processing equipment.

In FIG. 1, the interior is constructed of refractory material,
A shaft type preheating chamber 3 and a side wall portion 4 of a water cooling structure are arranged above the melting chamber 2 having a bottom electrode 6 on the bottom thereof, and an upper opening of the side wall portion 4 is an upper lid 5 of a water cooling structure which can be opened and closed. Is covered with. An upper electrode 7 made of graphite is provided which penetrates the upper lid 5 and is vertically movable into the melting chamber 2. The bottom electrode 6 and the top electrode 7 are connected to a DC power source (not shown), and an arc 19 serving as a heating source is generated between the bottom electrode 6 and the top electrode 7.

Above the preheating chamber 3, a bottom-opening type supply bucket 1 for supplying scrap car press scraps or waste home electric appliance scraps obtained without performing shredder processing as a melting raw material 16.
5 is provided by being suspended from the traveling carriage 11. The opening / closing lid 20 and the opening / closing lid 20a provided on the upper portion of the preheating chamber 3 are opened and closed by the supply bucket 15, and scraps of waste vehicle press waste or waste household electrical appliances are scraped. Is charged into the preheating chamber 3 as the melting raw material 16. Exhaust gas generated in the melting chamber 2 by alternately opening and closing the open / close lid 20 and the open / close lid 20a when charging the melting raw material 16, that is, by closing one of the open / close lids 20 and 20a. Can be prevented from leaking.

As the melting raw material 16, waste car press scraps obtained from used automobiles without shredding treatment, or waste home electric appliance scraps obtained from used home electric appliances without shredding treatment are used. However, in addition to these, other cold iron sources such as ordinary iron scrap or cold iron and direct reduced iron may be used as the melting raw material 16. FIG. 1 shows a case where scrap car press scraps and normal iron scraps are used in combination as the melting raw material 16.

A large amount of copper members are arranged as conductive materials in automobiles and home electric appliances, and since these copper members are the main cause of increasing the copper concentration of the molten metal 17 after melting, used automobiles and used home appliances The copper member may be removed from the device in advance and then scrapped. At that time, by removing 80% or more of the copper members constituting the automobile and the home electric appliances in advance, the copper concentration of the molten metal 17 to be generated is 0.3.
It can be suppressed to 5 mass% or less, and the copper concentration standard is 0.3.
It can be used as an iron source for steel products of 5 mass% or less.

An oxygen-containing gas supply lance 8 is provided penetrating the upper lid 5, and the oxygen-containing gas is melted in the melting chamber 2 in order to accelerate gasification and combustion of combustible substances contained in scraps of scraps of pressed cars and scraps of household electric appliances. It is blown inside. Air, oxygen-enriched air, and pure oxygen can be used as the oxygen-containing gas.

A pusher 12 is installed in the preheating chamber 3. The pusher 12 moves in and out of the preheating chamber 3, and the melting raw material 16 filled in the preheating chamber 3 is pushed into the melting chamber 2 and supplied. If the pusher 12 frequently moves in and out of the preheating chamber 3, a large amount of the melting raw material 16 is supplied to the melting chamber 2, and if the pusher 12 is stopped, the melting raw material 16 is melted in the melting chamber 2. Depending on the amount of the melting raw material 16,
It freely falls into the melting chamber 2 and is charged into the melting chamber 2. However, in this case, the supply amount of the melting raw material 16 to the melting chamber 2 is not stable, and the supply of the raw material 16 may become stagnant in the preheating chamber 3 due to the hanging state.

A duct 21 connected to the exhaust gas treatment equipment 31 is provided above the preheating chamber 3, and the high temperature exhaust gas generated in the melting chamber 2 passes through the preheating chamber 3 and the duct 21 to form the exhaust gas treatment equipment 31. Is discharged to. At that time, preheating room 3
The melting raw material 16 charged in the preheating chamber 3 is preheated by the exhaust gas passing through.

The protruding portion 2a provided on a portion of the melting chamber 2 different from the side to which the preheating chamber 3 is directly connected has a bottom portion, the outlet side of which is pressed by a door 22 so that sand or mud is filled inside. A tap hole 13 filled with the agent and a slag hole 14 whose side wall is filled with sand or mud agent and whose outlet side is pressed by a door 23 are provided. A burner 10 is attached to the upper lid 5 of the portion corresponding to the vertically upper side of the tap hole 13. Burner 10
Burns fossil fuels such as heavy oil, kerosene, pulverized coal, propane gas, and natural gas in the melting chamber 2 with air or oxygen or oxygen-enriched air. The melting chamber 2 is tilted toward the tap hole 13 side by a tilting device (not shown). In this way, the DC arc melting equipment 1 is constructed.

Further, as the exhaust gas treatment equipment 31 connected to the downstream side of the duct 21, a secondary combustion chamber 32 is first connected to the duct 21 as shown in FIG. An oxygen-containing gas such as air is supplied to the secondary combustion chamber 32 in order to burn the combustible components in the exhaust gas generated in the melting chamber 2 and raise the temperature of the exhaust gas. In addition, an auxiliary burner 33 that uses fuel such as heavy oil, kerosene, and LPG is installed in the secondary combustion chamber 32, and the auxiliary burner 33 can accelerate combustion and temperature rise of exhaust gas.

A cooling chamber 34 is installed downstream of the secondary combustion chamber 32. A water spray nozzle 35 is provided in the cooling chamber 34.
Is installed and the re-synthesis of harmful substances such as dioxins can be prevented by spraying cooling water to quench the exhaust gas.

A dilution air supply pipe 36 is connected to the downstream side of the cooling chamber 34, so that the dilution air and the exhaust gas can join. The diluting air may be either air sucked to collect dust in the building or air exclusively supplied as diluting air.

An adsorbent supply unit 37 and a blower 38 connected to the adsorbent supply unit 37 are installed downstream of the connecting portion of the dilution air supply pipe 36, and the adsorbent supply is performed via the blower 38. By supplying the adsorbent into the exhaust gas from the part 37, the harmful substances can be further reduced to a low level. In this case, slaked lime, activated carbon, coal ash or the like can be used as the adsorbent. A bag filter 39 is installed downstream of the adsorbent supply unit 37, and the exhaust gas passing through the bag filter 39 is installed downstream of the blower 40 via a blower 40 installed downstream of the bag filter 39. It is released from the chimney 41 into the atmosphere. The exhaust gas treatment facility 31 is configured in this way.

DC arc melting equipment 1 having such a structure
When the waste vehicle press waste or the waste home appliance waste obtained from the used automobile or the used home electric appliance is recycled as the melting raw material 16 by using the exhaust gas treatment equipment 31, first, the melting chamber 2 is placed in a horizontal state and supplied. Bucket 1
The molten raw material 16 is charged into the preheating chamber 3 from 5. Preheating room 3
The melting raw material 16 charged inside is also charged into the melting chamber 2 and eventually fills the inside of the preheating chamber 3. In order to uniformly load the melting raw material 16 into the melting chamber 2, the upper lid 5 may be opened and the melting raw material 16 may be charged into the melting chamber 2 opposite to the preheating chamber 3. Further, as described above, ordinary iron scrap, cold iron, and other cold iron sources such as direct reduced iron may be simultaneously charged into the preheating chamber 3 and the melting chamber 2 as the melting raw material 16.

Then, the upper electrode 7 is moved up and down while supplying a direct current between the bottom electrode 6 and the upper electrode 7, and the melting raw material 16 is charged between the bottom electrode 6 and the upper electrode 7 or charged.
An arc 19 is generated between the upper electrode 7 and the upper electrode 7. Then, the melting raw material 16 is melted by the generated arc heat to generate the molten metal 17. With the formation of the molten metal 17, quicklime,
A flux such as fluorite is charged into the melting chamber 2 to form the molten slag 18 on the molten metal 17 to prevent the molten metal 17 from being oxidized and to keep the molten metal 17 warm. When the amount of the molten slag 18 is too large, the molten slag 18 can be discharged from the outlet 14 even during melting.

Since the melting raw material 16 in the melting chamber 2 decreases as the molten metal 17 is generated, the operation of the pusher 12 is started from the time when the molten metal 17 is generated in the melting chamber 2. The pusher 12 may be operated to reciprocate within the preheating chamber 3 in about 10 seconds at intervals of several minutes, for example, once every 3 minutes. The melting raw material 16 to be filled in the preheating chamber 3 is forcedly pushed by the pusher 12 and supplied to the molten metal 17 side.

The melting raw material 16 in the preheating chamber 3 is the molten metal 1
Since it decreases with the generation of 7, the melting raw material 16 is charged from the supply bucket 15 into the preheating chamber 3 in order to compensate for this decrease. The charging of the melting raw material 16 into the preheating chamber 3 is performed continuously or intermittently so that the melting raw material 16 remains in the preheating chamber 3 and the melting chamber 2 continuously.

From the time when the molten metal 17 is produced, the oxygen-containing gas is supplied into the melting chamber 2 through the oxygen-containing gas supply lance 8 to gasify and combust combustible substances contained in scraps of scraps of pressed cars and scraps of household appliances. Promote. The hydrocarbon-based combustible gas produced by gasification of the combustible material is combusted by the oxygen-containing gas. At this time, combustion heat is generated, and this combustion heat further promotes gasification of the combustible material contained in the undissolved raw material 16 and contributes to preheating the raw material 16. By doing so, the exhaust gas discharged from the preheating chamber 3 contains a combustible gas, and contributes to the temperature rise of the exhaust gas in the secondary combustion chamber 32. In this case, in order to prevent the generated tar-based product from adhering, it is preferable to adjust the blowing amount of the oxygen-containing gas to maintain the exhaust gas temperature at the outlet of the preheating chamber 3 and the duct 21 at 400 ° C. or higher. . In order to further raise the exhaust gas temperature, it is preferable to carry out oxygen blowing and carbonaceous material blowing into the molten metal 17 via a blowing lance (not shown). As a result, CO gas is generated, and the exhaust gas temperature is further raised by the combustion heat due to the reaction with oxygen blown from the oxygen-containing gas supply lance 8.

When the melted raw material 16 is melted and a predetermined amount of melt 17, for example, one heat, is accumulated in the melt chamber 2, the melt chamber 2 is tilted toward the tap port 13 and the tap port 1 is moved.
The door 22 that has closed 3 is opened, and the molten metal 17 for one heat is discharged from the molten metal outlet 13 to a molten metal holding container (not shown).
At the time of tapping, the melt 17 may be heated by the burner 10 in order to prevent clogging of the tap hole 13 due to solidification of the tap metal 17. It should be noted that the predetermined amount of molten metal in the present invention means, for example, the amount of molten metal for one heat, or in the case of leaving the molten metal 17 in the melting chamber 2 after tapping, the amount of molten metal for one heat and the amount of molten metal in the melting chamber 2 It is an amount including the amount of residual molten metal, and is an amount of molten metal that is appropriately determined depending on the operating conditions.

When 80% or more of the copper member in the used automobile or the used home electric appliances is removed, the melting raw material 1
When a large amount of ordinary iron scrap is used together as 6, the copper concentration in the molten metal 17 produced is 0.35 mass%.
Since it can be suppressed to the following, a steel product having a copper concentration standard of 0.35 mass% or less is produced from the molten metal 17. Therefore, when tapping, it is possible to adjust the chemical composition such as the carbon concentration of the melt 17 to the standard range of the target steel product before tapping, or tap it after refining in a ladle refining furnace etc. In that case, the hot water is adjusted to near the standard range, tapped, adjusted to the standard range for steel products in a ladle refining furnace, and then cast by a continuous casting machine or the like. In addition, when the copper concentration in the molten metal 17 exceeds 0.35 mass% and it cannot be directed to steel products as it is, hot metal or cold metal tapped from the blast furnace, or iron scrap is used. To dilute the copper concentration.

After the molten metal 17 is discharged and, if necessary, the molten slag 18 is discharged, the melting chamber 2 is returned to the horizontal position, and the filling holes 13 and 14 are filled with filling sand or mud material. , Next, start melting the heat.

At the time of tapping, the unmelted melting raw material 16 may be maintained in the preheating chamber 3 and the melting chamber 2 continuously, and the melting raw material 16 in the preheating chamber 3 and the melting chamber 2 may be maintained.
It is also possible to dissolve all of the ingredients and then release the hot water. When the melting raw material 16 is left in the preheating chamber 3 and the melting chamber 2, it becomes possible to preheat all the melting raw material 16 that is melted after the second heat, and it is possible to reduce the amount of power consumption. When all of the molten raw material 16 is melted for each tap, the temperature of the melt 17 at the tap can be adjusted arbitrarily, so troubles at tapping due to a decrease in the melt temperature (blocking of the tap 13 etc.) Can be prevented.

When the unmelted melting raw material 16 is continuously present in the preheating chamber 3 and the melting chamber 2 during tapping, the melting raw material 16 is buried in the molten metal 17 and coexists. Therefore, the molten metal temperature is close to the solidification temperature, and it is difficult to obtain a sufficient degree of superheat. Therefore, when the temperature of the molten metal at the time of tapping is raised, when a predetermined amount, for example, one heat of the molten metal 17 is accumulated in the melting chamber 2, the pusher 1
2 is stopped and the supply of the melting raw material 16 to the melting chamber 2 is reduced, and heating is performed by arc heating or the combined use of the arc heating and the burner 10, or the pusher 12
In the state where the melting chamber 2 is tilted to the tap 13 side after the stop of
It is preferable to perform heating by arc heating or a combination of arc heating and the burner 10. By doing so, the melting raw material 16 buried in the molten metal 17 is reduced, the contact area between the molten metal 17 and the melting raw material 16 is reduced, and the amount of heating energy contributing to the temperature rise of the molten metal 17 is increased. The molten metal 17 having a large degree of superheat can be obtained.

On the other hand, during this time, the exhaust gas containing the combustible gas discharged from the preheating chamber 3 is introduced into the secondary combustion chamber 32 through the duct 21, and in the secondary combustion chamber 32, the combustible gas in the exhaust gas is removed. After complete combustion, the exhaust gas temperature at the outlet of the secondary combustion chamber 32 is maintained at 850 ° C or higher. By maintaining the exhaust gas temperature at 850 ° C. or higher, dioxins can be decomposed. The auxiliary burner 33 may be used to secure the exhaust gas temperature at 850 ° C. or higher. Further, in order to prevent the sensible heat of the exhaust gas discharged from the preheating chamber 3 from being removed, it is preferable that the secondary combustion chamber 32 be installed close to the preheating chamber 3.

The exhaust gas heated to a predetermined temperature or higher in the secondary combustion chamber 32 is rapidly cooled to 250 ° C. or lower in the cooling chamber 34 to prevent re-synthesis of harmful substances such as dioxins. Furthermore,
The exhaust gas is mixed with the dilution air supplied from the dilution air supply pipe 36 and cooled to about 100 ° C. Furthermore,
If necessary, an adsorbent is supplied from the adsorbent supply unit 37,
Adsorbs and removes dioxin and other harmful substances remaining in exhaust gas. The exhaust gas is dust-removed by the bag filter 39, and then released from the chimney 41 into the atmosphere.

In this way, the scraps of scraps of pressed cars or scraps of household electric appliances are melted as the melting raw material 16 to melt the used automobiles and the used electric appliances without shredding, that is, to generate shredder dust. Instead, used automobiles and used home appliances can be recycled as iron sources. Further, the molten raw material 16 is not directly charged into the molten metal 17 but is placed on the unmelted molten raw material 16 filled in the preheating chamber 3 and is preheated in the preheating chamber 3 and then supplied into the molten metal 17. Therefore, volatilization and combustion of the combustible material contained in the melting raw material 16 gradually progresses during preheating, and rapid combustion and smoke generation when immersed in the molten metal 17 can be prevented.

Further, the exhaust gas is 850 ° C. in the secondary combustion chamber 32.
Since the temperature is maintained at the above temperature and then rapidly cooled to 250 ° C. or lower in the cooling chamber 34, the dioxins in the exhaust gas can be extremely reduced.

Next, a second embodiment will be described. FIG. 3 is a diagram showing an example of the second embodiment of the present invention, and is a schematic vertical cross-sectional view of an arc melting facility in which the present invention is carried out. This arc melting equipment 1A has the same structure as that shown in FIG.
The exhaust gas treatment equipment 31 shown in is connected.

In FIG. 3, the interior is constructed of refractory material,
A shaft type preheating chamber 3 and a side wall portion 4 of a water cooling structure are arranged above the melting chamber 2 having a bottom electrode 6 on the bottom thereof, and an upper opening of the side wall portion 4 is an upper lid 5 of a water cooling structure which can be opened and closed. Is covered with. An upper electrode 7 made of graphite is provided which penetrates the upper lid 5 and is vertically movable into the melting chamber 2. The bottom electrode 6 and the top electrode 7 are connected to a DC power source (not shown), and an arc 19 serving as a heating source is generated between the bottom electrode 6 and the top electrode 7.

Above the preheating chamber 3, a bottom opening type supply bucket 1 for supplying scrap car press scraps or scraps of household electric appliances obtained without performing shredder processing as a melting raw material 16.
5 is provided by being suspended from the traveling carriage 11. The opening / closing lid 20 and the opening / closing lid 20a provided on the upper portion of the preheating chamber 3 are opened and closed by the supply bucket 15, and scraps of waste vehicle press waste or waste household electrical appliances are scraped. Is charged into the preheating chamber 3 as the melting raw material 16. Exhaust gas generated in the melting chamber 2 by alternately opening and closing the open / close lid 20 and the open / close lid 20a when charging the melting raw material 16, that is, by closing one of the open / close lids 20 and 20a. Can be prevented from leaking.

As the melting raw material 16, waste car press scraps obtained from used automobiles without shredding treatment, or waste home electric appliance scraps obtained from used home electric appliances without shredding treatment are used. However, in addition to these, other cold iron sources such as ordinary iron scrap or cold iron and direct reduced iron may be used as the melting raw material 16. FIG. 3 shows a case where scrap car press waste is used as the melting raw material 16.

A large number of copper members are arranged as conductive materials in automobiles and home electric appliances, and since these copper members are the main cause of increasing the copper concentration of the molten metal 17 after melting, used automobiles and used home appliances The copper member may be removed from the device in advance and then scrapped. At that time, by removing 80% or more of the copper members constituting the automobile and the home electric appliances in advance, the copper concentration of the molten metal 17 to be generated is 0.3.
It can be suppressed to 5 mass% or less, and the copper concentration standard is 0.3.
It can be used as an iron source for steel products of 5 mass% or less.

An oxygen-containing gas supply lance 8 is provided penetrating the upper lid 5, and the oxygen-containing gas is melted in the melting chamber 2 in order to promote gasification and combustion of combustible substances contained in scraps of scraps of pressed cars and scraps of household electric appliances. It is blown inside. Air, oxygen-enriched air, and pure oxygen can be used as the oxygen-containing gas.

On the side wall of the preheating chamber 3 above the position where the melting raw material 16 is charged, the oxygen-containing gas supply port 9 is provided.
Is provided, and an oxygen-containing gas is blown into the preheating chamber 3 in order to control the exhaust gas composition and the exhaust gas temperature at the outlet of the preheating chamber 3. Thus, the preheating chamber 3 has both the function of supplying the melting raw material 16 into the melting chamber 2 and the function of adjusting the composition and temperature of the exhaust gas generated in the melting chamber 2. In this case, a burner may be installed instead of the oxygen-containing gas supply port 9.

A pusher 12 is installed in the preheating chamber 3. The pusher 12 moves in and out of the preheating chamber 3, and the melting raw material 16 filled in the preheating chamber 3 is pushed into the melting chamber 2 and supplied. If the pusher 12 frequently moves in and out of the preheating chamber 3, a large amount of the melting raw material 16 is supplied to the melting chamber 2, and if the pusher 12 is stopped, the melting raw material 16 is melted in the melting chamber 2. Depending on the amount of the melting raw material 16,
It freely falls into the melting chamber 2 and is charged into the melting chamber 2. However, in this case, the supply amount of the melting raw material 16 to the melting chamber 2 is not stable, and the supply of the raw material 16 may become stagnant in the preheating chamber 3 due to the hanging state.

A duct 21 connected to the exhaust gas treatment facility 31 is provided above the preheating chamber 3, and the high-temperature exhaust gas generated in the melting chamber 2 passes through the preheating chamber 3 and the duct 21 to produce the exhaust gas treatment facility 31. Is discharged to. At that time, preheating room 3
The melting raw material 16 charged in the preheating chamber 3 is preheated by the exhaust gas passing through.

The protruding portion 2a provided on a portion of the melting chamber 2 different from the side to which the preheating chamber 3 is directly connected has a bottom portion, the outlet side of which is pressed by a door 22 to fill the inside with sand or mud. A tap hole 13 filled with the agent and a slag hole 14 whose side wall is filled with sand or mud agent and whose outlet side is pressed by a door 23 are provided. A burner 10 is attached to the upper lid 5 of the portion corresponding to the vertically upper side of the tap hole 13. Burner 10
Burns fossil fuels such as heavy oil, kerosene, pulverized coal, propane gas, and natural gas in the melting chamber 2 with air or oxygen or oxygen-enriched air. The melting chamber 2 is tilted toward the tap hole 13 side by a tilting device (not shown). In this way, the DC arc melting equipment 1A is constructed.

Duct 2 of this DC arc melting facility 1A
The exhaust gas treatment equipment 31 shown in FIG. The exhaust gas treatment equipment 31 is exactly the same as the exhaust gas treatment equipment described in the first embodiment, and therefore its description is omitted.

DC arc melting equipment 1 having such a configuration
When using A and the exhaust gas treatment facility 31 to recycle waste car press scraps or waste home appliance scraps obtained from used automobiles or used home appliances as the melting raw material 16, first, the melting chamber 2 is placed in a horizontal state, Supply bucket 1
The molten raw material 16 is charged into the preheating chamber 3 from 5. Preheating room 3
The melting raw material 16 charged inside is also charged into the melting chamber 2 and eventually fills the inside of the preheating chamber 3. In order to uniformly load the melting raw material 16 into the melting chamber 2, the upper lid 5 may be opened and the melting raw material 16 may be charged into the melting chamber 2 opposite to the preheating chamber 3. Further, as described above, ordinary iron scrap, cold iron, and other cold iron sources such as direct reduced iron may be simultaneously charged into the preheating chamber 3 and the melting chamber 2 as the melting raw material 16.

Next, the upper electrode 7 is moved up and down while supplying a direct current between the bottom electrode 6 and the upper electrode 7, and the melted raw material 16 is placed between the bottom electrode 6 and the upper electrode 7 or charged.
An arc 19 is generated between the upper electrode 7 and the upper electrode 7. Then, the melting raw material 16 is melted by the generated arc heat to generate the molten metal 17. With the formation of the molten metal 17, quicklime,
A flux such as fluorite is charged into the melting chamber 2 to form the molten slag 18 on the molten metal 17 to prevent the molten metal 17 from being oxidized and to keep the molten metal 17 warm. When the amount of the molten slag 18 is too large, the molten slag 18 can be discharged from the outlet 14 even during melting.

Since the melting raw material 16 in the melting chamber 2 decreases with the generation of the molten metal 17, the operation of the pusher 12 is started from the time when the molten metal 17 is generated in the melting chamber 2. The pusher 12 may be operated to reciprocate within the preheating chamber 3 in about 10 seconds at intervals of several minutes, for example, once every 3 minutes. The melting raw material 16 to be filled in the preheating chamber 3 is forcedly pushed by the pusher 12 and supplied to the molten metal 17 side.

The melting raw material 16 in the preheating chamber 3 is the molten metal 17
The amount of the molten raw material 16 decreases with the production of the molten metal, and in order to compensate for the reduced amount, the melting raw material 16 is charged from the supply bucket 15 into the preheating chamber 3. The charging of the melting raw material 16 into the preheating chamber 3 is
The melting raw material 16 is continuously or intermittently maintained so as to maintain a state in which the melting raw material 16 continuously exists in the preheating chamber 3 and the melting chamber 2.

From the time when the molten metal 17 is produced, the oxygen-containing gas is supplied into the melting chamber 2 through the oxygen-containing gas supply lance 8 to gasify and combust combustible substances contained in scraps of scraps of pressed cars and scraps of household electric appliances. Promote. The hydrocarbon-based combustible gas produced by gasification of the combustible material is combusted by the oxygen-containing gas. At this time, combustion heat is generated, and this combustion heat further promotes gasification of the combustible material contained in the undissolved raw material 16 and contributes to preheating the raw material 16. Therefore, the exhaust gas reaching above the melting raw material 16 in the preheating chamber 3 contains combustible gas, and the oxygen containing gas is supplied through the oxygen containing gas supply port 9 provided in the preheating chamber 3. , Part of the combustible gas is combusted, and the exhaust gas temperature at the outlet of the preheating chamber 3 and the duct 21 is 400 ° C. due to the combustion heat.
Keep above. By doing so, it is possible to prevent the generated tar-based product from adhering. Instead of the oxygen-containing gas supply port 9, heating may be performed with a burner. or,
The exhaust gas temperature at the outlet of the residual heat chamber 3 is preferably maintained at 1000 ° C. or higher in order to prevent the production of tar-based products. In order to further raise the exhaust gas temperature, it is preferable to carry out oxygen blowing and carbonaceous material blowing into the molten metal 17 via a blowing lance (not shown). As a result, CO gas is generated, and the exhaust gas temperature is further raised by the combustion heat due to the reaction with oxygen blown from the oxygen-containing gas supply lance 8.

When the melted raw material 16 is melted and a predetermined amount of melt 17, for example, one heat, is accumulated in the melt chamber 2, the melt chamber 2 is tilted toward the melt outlet 13 side while the melt outlet 1 is tilted.
The door 22 that has closed 3 is opened, and the molten metal 17 for one heat is discharged from the molten metal outlet 13 to a molten metal holding container (not shown).
At the time of tapping, the melt 17 may be heated by the burner 10 in order to prevent clogging of the tap hole 13 due to solidification of the tap metal 17.

When 80% or more of the copper member in the used automobile or the used home electric appliances is removed, the melting raw material 1
When a large amount of ordinary iron scrap is used together as 6, the copper concentration in the molten metal 17 produced is 0.35 mass%.
Since it can be suppressed to the following, a steel product having a copper concentration standard of 0.35 mass% or less is produced from the molten metal 17. Therefore, when tapping, it is possible to adjust the chemical composition such as the carbon concentration of the melt 17 to the standard range of the target steel product before tapping, or tap it after refining in a ladle refining furnace etc. In that case, the hot water is adjusted to near the standard range, tapped, adjusted to the standard range for steel products in a ladle refining furnace, and then cast by a continuous casting machine or the like. In addition, when the copper concentration in the molten metal 17 exceeds 0.35 mass% and it cannot be directed to steel products as it is, hot metal or cold metal tapped from the blast furnace, or iron scrap is used. To dilute the copper concentration.

After the molten metal 17 is tapped and the molten slag 18 is drained if necessary, the melting chamber 2 is returned to the horizontal position, and the tap holes 13 and 14 are filled with filling sand or mud material. , Next, start melting the heat.

At the time of tapping, the unmelted melting raw material 16 may be maintained in the preheating chamber 3 and the melting chamber 2 continuously, and the melting raw material 16 in the preheating chamber 3 and the melting chamber 2 may be maintained.
It is also possible to dissolve all of the ingredients and then release the hot water. When the melting raw material 16 is left in the preheating chamber 3 and the melting chamber 2, it becomes possible to preheat all the melting raw material 16 that is melted after the second heat, and it is possible to reduce the amount of power consumption. When all of the molten raw material 16 is melted for each tap, the temperature of the melt 17 at the tap can be adjusted arbitrarily, so troubles at tapping due to a decrease in the melt temperature (blocking of the tap 13 etc.) Can be prevented.

When the unmelted raw material 16 is continuously present in the preheating chamber 3 and the melting chamber 2 at the time of tapping, the molten raw material 16 is buried in the molten metal 17 and coexists. Therefore, the molten metal temperature is close to the solidification temperature, and it is difficult to obtain a sufficient degree of superheat. Therefore, when the temperature of the molten metal at the time of tapping is raised, when a predetermined amount, for example, one heat of the molten metal 17 is accumulated in the melting chamber 2, the pusher 1
2 is stopped and the supply of the melting raw material 16 to the melting chamber 2 is reduced, and heating is performed by arc heating or the combined use of the arc heating and the burner 10, or the pusher 12
In the state where the melting chamber 2 is tilted to the tap 13 side after the stop of
It is preferable to perform heating by arc heating or a combination of arc heating and the burner 10. By doing so, the melting raw material 16 buried in the molten metal 17 is reduced, the contact area between the molten metal 17 and the melting raw material 16 is reduced, and the amount of heating energy contributing to the temperature rise of the molten metal 17 is increased. The molten metal 17 having a large degree of superheat can be obtained.

On the other hand, during this time, the exhaust gas containing the combustible gas discharged from the preheating chamber 3 is introduced into the secondary combustion chamber 32 through the duct 21, and in the secondary combustion chamber 32, the combustible gas in the exhaust gas is removed. After complete combustion, the exhaust gas temperature at the outlet of the secondary combustion chamber 32 is maintained at 850 ° C or higher. By maintaining the exhaust gas temperature at 850 ° C. or higher, dioxins can be decomposed. The auxiliary burner 33 may be used to secure the exhaust gas temperature at 850 ° C. or higher.

The exhaust gas heated to a predetermined temperature or higher in the secondary combustion chamber 32 is rapidly cooled to 250 ° C. or lower in the cooling chamber 34 to prevent re-synthesis of harmful substances such as dioxins. Furthermore,
The exhaust gas is mixed with the dilution air supplied from the dilution air supply pipe 36 and cooled to about 100 ° C. Furthermore,
If necessary, an adsorbent is supplied from the adsorbent supply unit 37,
Adsorbs and removes dioxin and other harmful substances remaining in exhaust gas. The exhaust gas is dust-removed by the bag filter 39, and then released from the chimney 41 into the atmosphere.

In this way, the scraps of scraps of pressed cars or scraps of household electric appliances are melted as the melting raw material 16 to melt used automobiles and used household appliances without shredding, that is, to generate shredder dust. Instead, used automobiles and used home appliances can be recycled as iron sources. Further, the molten raw material 16 is not directly charged into the molten metal 17 but is placed on the unmelted molten raw material 16 filled in the preheating chamber 3 and is preheated in the preheating chamber 3 and then supplied into the molten metal 17. Therefore, volatilization and combustion of the combustible material contained in the melting raw material 16 gradually progresses during preheating, and rapid combustion and smoke generation when immersed in the molten metal 17 can be prevented.

Further, by supplying the oxygen-containing gas above the melting raw material 16 in the preheating chamber 3 and burning the combustible gas in the exhaust gas, the temperature of the exhaust gas at the outlet of the preheating chamber 3 is adjusted to 4
The temperature can be maintained at 00 ° C or higher, and the adhesion of tar-based products can be prevented.

Further, the exhaust gas is 850 ° C. in the secondary combustion chamber 32.
Since the temperature is maintained at the above temperature and then rapidly cooled to 250 ° C. or lower in the cooling chamber 34, the dioxins in the exhaust gas can be extremely reduced.

In the above description, the case of the DC type arc melting equipment is explained, but the present invention can be applied to the AC type arc melting equipment without any trouble. Further, the positional relationship between the preheating chamber 3 and the tap hole 13 in the melting chamber 2 is not limited to a position facing the center of the melting chamber 2 by 180 °, but may be a position of 90 °.
In addition, when tapping the molten metal, several tons to several tens of tons of the molten metal 17 are melted into the melting chamber 2.
It may be left inside and the melting of the heat may be resumed next time.
By doing so, the initial dissolution is promoted and the dissolution efficiency is improved. Although the case of arc heating as the heating source has been described, gas burner heating, electric induction heating, plasma gas heating or the like can be used as a heating source other than arc heating.

[0075]

EXAMPLES Example 1 An example of the DC arc melting equipment shown in FIG. 1 will be described below. The exhaust gas treatment equipment shown in FIG. 2 is connected to this arc melting equipment, and the arc melting equipment has a melting chamber with a diameter of 5.5 m and a height of 3.5.
m, the preheating chamber has a maximum width of 4 m, a length of 4 m, and a height of 5 m, and the melting chamber has a capacity of 100 tons. The used car scraps used are
This is a pressed automobile used to remove some of plastics such as engine, battery, fuel tank, tire, suspension, drive shaft, and bumper and 90% or more of copper members.

First, 60% of a melting raw material prepared by mixing 20% of scrap car press waste with ordinary iron scrap is placed in the melting chamber and the preheating chamber.
Ton was charged and the melting by the arc was started. Then, as the molten metal was produced, the pusher was moved in and out of the preheating chamber at intervals of 3 minutes.

After that, when the mixture of the ordinary iron scrap in the melting chamber and the scrap scraps of the scrap car, that is, the melting raw material is melted, the melting raw material in the preheating chamber is lowered, and 20% of the scrap scrap of the scrap car is mixed with the ordinary iron scrap. The melted raw material was charged into the preheating chamber with a supply bucket, and the melting was continued while maintaining the height of the molten raw material in the preheating chamber within a certain height range. Then, when about 100 tons of molten metal is generated in the melting chamber, the operation of the pusher is stopped, the molten metal components are adjusted, and the temperature of the molten metal is raised, and then about 30 tons of molten metal is left in the melting chamber, About 70 tons of molten metal was tapped into a ladle with the molten raw material continuously present in the preheating chamber.

After tapping, the molten raw material in the melting chamber was melted while maintaining the height of the molten raw material in the preheating chamber within a certain height range, and when about 100 tons of molten metal was produced in the melting chamber, the pusher After stopping the operation, adjusting the molten metal components and raising the temperature of the molten metal, about 30 tons of the molten metal is left in the melting chamber and the molten raw material is continuously present in the melting chamber and the preheating chamber. Tons of tons were repeatedly discharged into a ladle.

The copper concentrations of the thus obtained molten metals were all 0.35 mass% or less. The molten metal was cast by a continuous casting machine and then hot-rolled to produce a steel product having a copper concentration standard of 0.35 mass% or less.

Further, during this period, industrial pure oxygen was supplied to the melting chamber as an oxygen-containing gas to promote the gasification and combustion of the combustible material contained in the scraps of scrap cars. Further, the exhaust gas discharged from the preheating chamber is introduced into the secondary combustion chamber, where air is supplied as an oxygen-containing gas to burn combustible gas in the exhaust gas, and the temperature of the exhaust gas at the outlet of the secondary combustion chamber is adjusted to 850 Keep the temperature above ℃, and then remove the exhaust gas from the secondary combustion chamber in the cooling chamber.
It was rapidly cooled to below 50 ° C. As a result, dioxins in the exhaust gas were reduced, and the concentration of dioxins in the exhaust gas could be made 0.1 ng-TEQ / Nm ³ or less. or,
No adhesion of the tar-based composition was observed in the duct or the secondary combustion chamber.

[Embodiment 2] An embodiment of the DC arc melting equipment shown in FIG. 3 will be described below. The exhaust gas treatment equipment shown in Fig. 2 is connected to this arc melting equipment,
The arc melting equipment has a melting chamber with a diameter of 5.5 m and a height of 3.5.
m, the preheating chamber has a maximum width of 4 m, a length of 4 m, and a height of 5 m, and the melting chamber has a capacity of 100 tons. The used car scraps used are
This is a pressed automobile used to remove some of plastics such as engine, battery, fuel tank, tire, suspension, drive shaft, and bumper and 90% or more of copper members.

First, ordinary iron scrap was charged into the melting chamber, and then scrap car press waste was charged into the preheating chamber. The total charging amount of iron scrap and scrap of scrap car was 45 tons. Then, the melting by the arc was started, and the pusher was moved in and out of the preheating chamber at intervals of 3 minutes as the molten metal was generated.

After that, when the scrap iron press scraps in the preheating chamber descend as the normal iron scrap in the melting chamber melts, the scrap scraps are put into the preheating chamber with the supply buckets so that the preheating chamber always has a space. In order to secure the height, the height of the scrap car press waste in the preheating chamber was maintained within a certain height range to continue melting. When about 100 tons of molten metal is generated in the melting chamber, the operation of the pusher is stopped, the molten metal components are adjusted, and the temperature of the molten metal is raised.
About 0 tons of molten metal was left in the melting chamber, and about 70 tons of molten metal was tapped into a ladle in a state where scrap car press scraps were continuously present in the melting chamber and the preheating chamber.

After tapping, the waste car press scraps in the melting chamber are melted while maintaining the height of the scrap car press scraps in the preheating chamber within a certain height range, and when about 100 tons of molten metal is generated in the melting chamber, After stopping the operation of the pusher and adjusting the molten metal components and raising the temperature of the molten metal, about 30 tons of the molten metal was left in the melting chamber, and scrap car press scraps were continuously present in the melting chamber and the preheating chamber. Repeatedly pouring about 70 tons of molten metal into a ladle.

The copper concentrations of the molten metals thus obtained were all 0.35 mass% or less. The molten metal was cast by a continuous casting machine and then hot-rolled to produce a steel product having a copper concentration standard of 0.35 mass% or less.

During this period, industrial pure oxygen was supplied as an oxygen-containing gas to the melting chamber and the preheating chamber, and the exhaust gas temperature at the outlet of the preheating chamber was controlled to 1000 ° C. or higher. Then, the exhaust gas discharged from the preheating chamber is introduced into the secondary combustion chamber, where the combustible gas in the exhaust gas is burned, the temperature of the exhaust gas is maintained at 850 ° C or higher, and then the secondary combustion chamber is discharged. The exhaust gas was rapidly cooled to 250 ° C or lower in the cooling chamber. As a result, dioxins in the exhaust gas were reduced, and the concentration of dioxins in the exhaust gas could be made 0.1 ng-TEQ / Nm ³ or less. Further, no adhesion of the tar-based composition was observed in the duct or the secondary combustion chamber.

[0087]

EFFECTS OF THE INVENTION According to the present invention, it is possible to prevent generation and adhesion of a tar-based composition that is generated as a combustible gas from used automobiles and used home appliances, and prevent generation of harmful substances such as dioxins. Recycling a large amount of used automobiles or used home appliances without shredding as an iron source, in other words, without using any shredder treatment costs and shredder dust treatment costs, it is possible to dispose of used automobiles or used home appliances. It can be recycled as an iron source at a low cost, and brings industrial beneficial effects.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a first embodiment of the present invention, and is a schematic vertical cross-sectional view of an arc melting facility in which the present invention is implemented.

FIG. 2 is a schematic diagram of an exhaust gas treatment facility connected to an arc melting facility.

FIG. 3 is a diagram showing an example of a second embodiment of the present invention, and is a schematic vertical cross-sectional view of an arc melting facility in which the present invention is implemented.

[Explanation of symbols]

1 DC arc melting equipment 1A DC arc melting equipment 2 Melting chamber 3 preheating room 6 bottom electrode 7 Upper electrode 8 Oxygen-containing gas supply lance 9 Oxygen-containing gas supply port 12 pushers 13 Outlet 16 Melting raw material 17 Molten metal 18 Molten slag 19 arc 21 duct 31 Exhaust gas treatment equipment 32 Secondary combustion chamber 34 Cooling chamber 36 Dilution air supply pipe 37 Adsorbent supply unit 39 Bug filter 41 chimney

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F23G 5/00 115 F23G 5/027 Z 4K045 5/027 5/16 E 4K063 5/16 5/24 B 5 / 24 7/00 B 7/00 F27B 3/18 F27B 3/18 F27D 13/00 D F27D 13/00 F B09B 3/00 303Z (72) Inventor Katsuhiro Iwasaki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Pipe Co., Ltd. (72) Inventor Ryuji Yamaguchi 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. (72) Toshimichi Maki 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. F-term (reference) 3K061 AA16 AB03 AC20 BA05 CA14 DB02 DB04 DB18 FA04 FA21 FA27 3K078 AA05 BA03 CA02 CA11 4D004 AA22 AA26 BA05 CA27 CA29 CB04 CB31 CB42 DA03 DA06 4K001 AA10 BA 22 FA10 GA16 GB01 4K014 CB07 CB09 CC05 CD13 4K045 AA04 BA02 RB02 RB22 RC02 4K063 AA04 BA02 BA13 CA01 CA02 CA06 GA02 GA09

Claims (6)

[Claims] 1. A melting facility having a melting chamber having a heating source and a shaft type preheating chamber directly connected to the melting chamber is used, and the melting facility is obtained from a used automobile or a used household electric appliance without performing a shredder treatment. When melting scrap car press scraps or waste home appliance scraps as a melting raw material, to the preheating chamber so that unmelted scrap car press scraps or waste home appliance scraps remain in the melting chamber and preheating chamber While supplying scraps, supplying oxygen-containing gas into the melting chamber to promote gasification and combustion of combustibles contained in scrap car press scraps or scraps of household electric appliances, A method of recycling used automobiles or used home appliances, which comprises melting at a heating source and discharging when a predetermined amount of molten metal is generated in the melting chamber. 2. The used according to claim 1, wherein an oxygen-containing gas is supplied above the molten raw material in the preheating chamber to burn combustible gas generated from scraps of scrap of used cars or scraps of household electric appliances. Recycling method for automobiles or used home appliances. 3. The supply amount of the oxygen-containing gas is adjusted, the exhaust gas temperature at the outlet of the preheating chamber is kept at 400 ° C. or higher, and the flammable gas is left in the exhaust gas at the outlet of the preheating chamber. The method for recycling used automobiles or used home appliances according to claim 1 or 2. 4. The combustible gas in the exhaust gas is burned in a secondary combustion chamber provided on the downstream side of the preheating chamber to adjust the exhaust gas temperature to 85%.
4. The exhaust gas is maintained at 0 ° C. or higher, and then the exhaust gas is rapidly cooled to 250 ° C. or lower in a cooling chamber provided on the downstream side of the secondary combustion chamber. Recycling method for used automobiles or used home appliances. 5. The preheating chamber is provided with a pusher,
The method for recycling used automobiles or used home appliances according to any one of claims 1 to 4, wherein the melting raw material is supplied from the preheating chamber to the melting chamber by operating the pusher. 6. The method for recycling used automobiles or used home appliances according to claim 1, wherein the heating source is arc heating.