JP2002285225A - Recycle treatment method for spent car or spent electric home appliances - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply recycle treatment to spent cars and spent electric home appliances generated in large quantities as an iron source without treating them with a shredder. SOLUTION: When a waste car scrap or a waste car pressed scrap or a waste electric home appliance scraps obtained from the spent car or the spent electric home appliances without treating them with the shredder, is melted as a melting raw material 16 in a melting chamber 2 having a heating source 19, gasifiable component in the melting raw material is gasified by preheating the melting raw material and thereafter, the melting raw material is charged into the melting chamber and melted. In this time, it is desirable to gasify in a preheating chamber 3 directly connected with the melting chamber and to use by mixing the produced molten metal 17 with molten iron in a blast furnace.

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 used refrigerators and washing machines, and more particularly to a method for shredding used automobiles or used electric home appliances. And a method for recycling as an iron source.

[0002]

2. Description of the Related Art Conventionally, used automobiles are pressed after valuable parts such as batteries and tires are removed, shredded after pressing, and reused as iron scrap. Plastic, rubber,
Shredder dust mixed with iron, aluminum, copper, etc. is generated. About 200 kg of shredder dust is generated from shredder processing of one ton of used vehicles, and about 800,000 tons of shredder dust is generated from used vehicles in Japan annually. Similarly, used home appliances are also shredded after removing a motor, a coolant, and the like, and approximately 300,000 tons of shredder dust is generated from used home appliances in Japan every year. This shredder dust is disposed of in landfill or burned and melted in a waste incinerator.

[0003] Landfill disposal requires a large disposal cost because the disposal site is limited. In addition, in the burning treatment by an incinerator, ash and metal in the shredder dust remain, and this disposal poses a problem. Furthermore, in the method of gasifying shredder dust and simultaneously melting non-combustible components directly, a molten metal mainly composed of iron and copper is generated, which can be used as a counterweight after solidification, but the amount used is limited. Yes, disposal of this bullion is a problem.

On the other hand, used automobiles (hereinafter also referred to as “waste cars”) are not shredded, and press scraps of the used automobiles (hereinafter referred to as “waste car press waste”) are directly passed through a steel melting furnace represented by a converter. The dissolving method is disclosed in JP-A-10-33.
No. 0821 has been proposed. According to this method,
No shredder dust is generated, and plastic, rubber, and the like also serve as a heat source at the time of melting, and can efficiently dissolve waste car press waste. However, this method has a limit in the amount of scrap car scrap that can be dissolved. That is, according to the same publication, the scrap scraps that can be charged into a 250-ton converter can be reduced to 15 tons (approximately 10 scrap cars) per heat because of the steel composition. Due to problems such as the method of charging scrap into the furnace and the generation of smoke at the time of charging, in reality, the limit is about four scrap cars per heat.

A method of directly charging waste car press waste into an arc melting facility (electric furnace) is also conceivable, but the waste car press waste has a large size (about 0.8 m × 0.8 m × 1.3 m). Since the bulk density is low, the furnace lid must be opened and closed each time scrap scrap is charged in ordinary arc melting equipment. From the viewpoint of productivity of the arc melting equipment and environmental measures, the arc melting equipment has There is naturally a limit to the charging.

[0006]

The number of scrapped vehicles generated in Japan is about 5 million units per year, and the penetration rate of home electric appliances does not stagnate even if the penetration rate increases. In addition, it is almost impossible to recycle such a large amount of used automobiles and used home appliances in a converter or arc melting equipment, which is a typical steel melting furnace, without shredding, without using the conventional technology. is there.

[0007] The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a method of recycling used automobiles and home electric appliances generated in large quantities as iron sources without shredding, that is, without generating shredder dust.

[0008]

SUMMARY OF THE INVENTION A method for recycling used automobiles or used home appliances according to the first aspect of the present invention is a method of recycling used cars or used home appliances, which is obtained from a used car or used home appliances without shredding. When melting press waste or waste home appliance waste in a melting chamber having a heating source as a melting raw material, this melting raw material is preheated to gasify gasified components in the melting raw material, and then the melting raw material is introduced into the melting chamber. It is characterized by being introduced and dissolved.

According to a second aspect of the present invention, there is provided the method for recycling used automobiles or used home appliances according to the first aspect, wherein the exhaust gas generated in the melting chamber is introduced into the melting chamber, and the raw material is dissolved by the exhaust gas. A preheating chamber for preheating is directly connected, and gasified components are gasified in the preheating chamber.

[0010] The recycling method of used automobiles or used home appliances according to the third invention is the same as the recycling method of used cars or used home appliances of the first invention or the second invention, further comprising the steps of: After the molten metal produced by the melting of the molten iron is discharged from the melting chamber, the molten metal is mixed with blast furnace hot metal and refined in a converter.

[0011] A method for recycling used automobiles or used home appliances according to a fourth invention is characterized in that, in any one of the first invention to the fourth invention, the heating source is arc heating. It is.

In the first invention and the second invention, scrap car waste, scrap car press waste or scrap household electric appliances obtained from used automobiles or used home electric appliances without being subjected to shredder treatment is contained in these melting raw materials. Since the gasification components to be gasified are sufficiently volatilized and gasified and then charged into the melting chamber, it is possible to prevent rapid combustion and smoke emission when these dissolved raw materials are immersed in the molten metal in the melting chamber. Dissolved raw materials can be dissolved in large quantities and continuously. For example,
It is possible to dissolve even the entire scrap car press waste. That is, a large amount of used automobiles or used home appliances can be recycled as an iron source without shredding.

According to the third aspect of the present invention, the molten metal produced by melting the scrap car scrap, scrap car press scrap or scrap household electric appliance is mixed with the hot metal discharged from the blast furnace and refined in the converter. Generated when everything is melted as scrap car scrap,
Even a molten metal containing about 1 mass% of copper can be used as a part of the iron source of ordinary steel or as a copper source and an iron source of copper-containing steel.

Further, in the fourth invention, since the arc heating is used as the heating source, the heating amount and the heating rate can be easily controlled, and the scrap of scrap car, scrap of scrap car, or scrap of household electric appliance can be quickly and stably melted. can do.

In the present invention, the scrap car scrap refers to a scrap car from which valuable parts such as batteries and tires have been removed before being pressed, and the scrap scrap refers to a scrap car from which the valuable portion has been removed. The used car was pressed or cut after pressing. On the other hand, waste household waste refers to waste household appliances from which parts to be removed such as coolant have been removed before or after pressing. The shape may be as it is. In the recycling method of the present invention, since most home appliances can be melted in the same shape as long as the size of the home appliances, in the case of used home appliances, pressing is not performed from the viewpoint of reducing the pressing cost. Is more preferred.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, a first embodiment will be described with reference to FIGS. FIG. 1 is a view showing an example of an embodiment of the present invention, and is a schematic longitudinal sectional view of an arc melting equipment embodying the present invention, and FIG. 2 is a schematic plan view of the arc melting equipment shown in FIG.

In FIG. 1 and FIG. 2, a water-cooled furnace wall 4 is disposed on the upper side wall of the melting chamber 2 having a furnace bottom electrode 6 at the bottom, the inside of which is constructed of a refractory material. Is covered with a furnace lid 5 having a water cooling structure that can be opened and closed. A shaft-type preheating chamber 3 is disposed directly connected to the furnace lid 5.
And an upper electrode 7 made of graphite which can move up and down into the melting chamber 2 is provided. The furnace bottom electrode 6 and the upper electrode 7 are connected to a DC power supply (not shown), and an arc 19 serving as a heating source is generated between the furnace bottom electrode 6 and the upper electrode 7.

Above the preheating chamber 3, a bottom-opening supply bucket 15 for supplying scrap car waste, scrap car press waste or waste home appliance scrap obtained without shredding as a melting raw material 16 is a traveling cart. 24, the opening / closing lid 20 and the opening / closing lid 20 a provided in the preheating chamber 3 are opened and closed, and the molten raw material 16 is charged into the preheating chamber 3 from the supply bucket 15. When charging the raw material for melting 16, the open / close lid 20 and the open / close lid 20 a are alternately opened / closed, that is, by closing one of the open / close lids 20, 20 a, the exhaust gas generated in the melting chamber 2. Leakage can be prevented. An openable grate 11 is installed at the bottom of the preheating chamber 3, and the molten raw material 16 is a grate 11.
And stays in the preheating chamber 3.

As described above, the melting raw material 16 is as follows.
Scrap car scrap or scrap car scrap obtained from a used car without shredding, or scrap household scrap obtained from a used home appliance without shredding is used. However, besides these, other cold iron sources such as ordinary iron scrap, cold pig iron and direct reduced iron may be used as the melting raw material 16. FIG. 1 shows a case where scrap car scrap is used as the melting raw material 16.

A large amount of copper members are disposed as a conductive material 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 electric appliances are used. The copper member may be removed from the device in advance, and thereafter, may be scrapped. At this time, by removing 80 mass% or more of the copper members constituting the automobile and the home appliance in advance, the copper concentration of the molten metal 17 generated can be suppressed to 0.35 mass% or less. Even if it is not used, it can be used as an iron source for steel products having a copper concentration standard of about 0.35 mass% or less.

The preheating chamber 3 is provided with a duct 21 connected to a dust collector (not shown), and high-temperature exhaust gas generated in the melting chamber 2 is discharged through the preheating chamber 3 and the duct 21. At that time, the exhaust gas passing through the preheating chamber 3 preheats the molten raw material 16 held by the grate 11 in the preheating chamber 3, and gasification components in the molten raw material 16 are volatilized and gasified. After the gasified components in the melted raw material 16 are sufficiently volatilized and gasified, the melted raw material 16 is charged into the melting chamber 2.

An oxygen blowing lance 8 and a carbon material blowing lance 9 are provided to penetrate the furnace cover 5 and move up and down in the melting chamber 2, and oxygen is blown into the melting chamber 2 from the oxygen blowing lance 8. And, from the carbon material injection lance 9, air, nitrogen or the like is used as a carrier gas for coke, char,
A coal material such as coal, charcoal, graphite or the like is blown into the melting chamber 2.

The projecting portion 2a, which is provided on a portion of the melting chamber 2 which is different from the side to which the preheating chamber 3 is directly connected, has an outlet side pressed down by a door 22 on its bottom to fill the inside with sand or mud. A tap hole 13 filled with the agent and a tap hole 14 whose inner wall is pressed by a door 23 and filled with sand or a mud agent are provided on the side wall thereof. A burner 10 is attached to the furnace lid 5 at a position corresponding to a position vertically above 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 13 by a tilting device (not shown). Thus, the DC arc melting equipment 1 is configured.

DC arc melting equipment 1 having such a configuration
At the time of recycling waste car waste or waste car press waste or waste home appliance scrap obtained from used automobiles or used home appliances as melting raw material 16, first, the melting chamber 2 was placed in a horizontal state, and the grate 11 was closed. In this state, the molten raw material 16 is charged into the preheating chamber 3 from the supply bucket 15. Before and after this, the melting raw material 16 is also charged into the melting chamber 2. As described above, other iron sources such as ordinary iron scrap, cold pig iron and direct reduced iron are simultaneously supplied to the preheating chamber 3 and the melting chamber 2.
May be charged.

Next, the upper electrode 7 is moved up and down while supplying a direct current between the furnace bottom electrode 6 and the upper electrode 7, and the space between the furnace bottom electrode 6 and the upper electrode 7 or the charged raw material 16
An arc 19 is generated between the electrode and the upper electrode 7. Then, the molten raw material 16 is melted by the generated arc heat to generate a molten metal 17. With the production of molten metal 17, quicklime,
A flux such as fluorite is charged into the melting chamber 2 to form a molten slag 18 on the molten metal 17, thereby preventing oxidation of the molten metal 17 and keeping the temperature of the molten metal 17 high. If the amount of the molten slag 18 is too large, it can be discharged from the slag port 14 even during melting.

From the time the molten metal 17 is formed, it is preferable to blow oxygen from the oxygen blowing lance 8 and carbon material from the carbon material blowing lance 9 into the molten metal 17 or the molten slag 18 in the melting chamber 2. The carbon material blown and dissolved in the molten metal 17 or the carbon material suspended in the molten slag 18 reacts with the blown oxygen to generate combustion heat, and acts as an auxiliary heat source to save power consumption. At the same time, the bubbles 25 of the reaction product CO gas form the molten slag 18 and the arc 19 is wrapped in the molten slag 18, so-called slag forming operation.

In addition, high-temperature CO gas generated in large quantities
CO generated by combustion of CO gas _Two The gas is supplied to the preheating chamber 3
Through the duct 21. This exhaust gas
Therefore, the molten raw material 16 in the preheating chamber 3 is efficiently preheated,
The gasification components in the dissolved raw material 16 are volatilized and gasified. Ten
Once the gasified components have volatilized, release the grate 11
The molten raw material 16 is supplied from the preheating chamber 3 to the melting chamber 2. Throw
After entering, the grate 11 is closed, and new melting is performed again in the preheating chamber 3.
The raw material 16 is charged, and the gasified component in the dissolved raw material 16 is removed.
Volatilize, and after sufficient volatilization, put into melting chamber 2
Is repeatedly performed.

When the melting of the molten raw material 16 proceeds in this way and a predetermined amount of molten metal, for example, the molten metal 17 for one heat accumulates in the melting chamber 2, the temperature of the molten metal 17 is raised as necessary. Then, the door 22 closing the tap 13 is opened while tilting the melting chamber 2 toward the tap 13, and the molten metal 17 for one heat is discharged from the tap 13 into a molten metal holding container (not shown). At the time of tapping, the tap 13 due to solidification of the melt 17
The molten metal 17 may be heated by the burner 10 in order to prevent clogging. Note that the predetermined amount of molten metal is, for example, the amount of molten metal for one heat, or the amount of molten metal for one heat and the amount of molten metal remaining in the melting chamber 2 when the molten metal 17 remains in the melting chamber 2 after tapping. And the amount of the molten metal appropriately determined according to the operating conditions.

When the molten metal 17 is mixed with the blast furnace molten iron and refined in a converter, the higher the carbon concentration of the molten metal 17 becomes, the easier the converter refining in the next step becomes. Therefore, the carbon concentration of the molten metal 17 is increased. It is preferable to discharge the molten metal 17 as molten iron. The carbon concentration of the molten metal 17 can be adjusted to an arbitrary value by controlling the amount of carbon material blown from the carbon material blowing lance 9. In this case, the carbon concentration may be adjusted as needed before tapping.

After tapping, the mixture is mixed with blast furnace molten iron, refined in a converter, melted into molten steel of a predetermined component, and then cast by a continuous casting machine or the like. In this case, the molten steel 17 is adjusted so that the molten steel component after the converter refining conforms to the standard for the copper concentration of the steel product.
Adjust the blending amount of When refining in the converter, either the molten metal 17 may be charged into the converter as it is, or the molten metal 17 may be once solidified and then charged into the converter. Also, molten metal 17
When charged as it is, it may be either mixed with the blast furnace hot metal and then charged into the converter, or separately charged and mixed in the converter.

On the other hand, when the copper member in the used automobile or the copper member in the used home electric appliance is removed or when a large amount of ordinary iron scrap or the like is used in combination as the melting raw material 16, the molten metal 17 that is formed Copper concentration in the lower,
Mixing with blast furnace hot metal may be unnecessary. When it is not necessary to mix the molten metal 17 with the molten iron in the blast furnace, the chemical composition such as the carbon concentration of the molten metal 17 is adjusted to the standard range of the target steel product before tapping, or the ladle after tapping. If refining is possible in a refining furnace or the like, the hot water is adjusted in the vicinity of the specification range, and the steel product is adjusted to the specification range of the steel product in a ladle refining furnace or the like and cast by a continuous casting machine or the like.

After the molten metal 17 is discharged, and the molten slag 18 is discharged as required, the melting chamber 2 is returned to a horizontal position, and the filling holes 13 and 14 are filled with sand or mud material. Next, start melting the heat. By leaving the molten metal 17 in the melting chamber 2 at the time of tapping, it is not necessary to put the molten raw material 16 in the melting chamber 2 at the start of the next heat, and the molten raw material 16 can be continuously melted in the previous heat.

By dissolving scrap car scrap, scrap scrap from car scrap, or scrap from waste home appliances as the dissolving raw material 16 in this manner,
It is possible to dissolve used cars and used home appliances without shredding, that is, to recycle used cars and used home appliances as iron sources without generating shredder dust. Further, at the time of melting, the molten raw material 16 is charged into the melting chamber 2 after the gasified components are sufficiently volatilized in the preheating chamber 3, and thus is included in the molten raw material 16 when charged into the molten metal 17. Rapid combustion and fuming of combustibles can be prevented.

The molten raw material 16 obtained from used automobiles and used home appliances contains combustible materials such as plastics and rubber, and therefore, it is necessary to recover these as gases without burning them from the viewpoint of resource utilization. preferable. The method of recovering these combustibles as gas can be performed as follows.

That is, the gasified components in the molten raw material 16 are volatilized as much as possible during the preheating of the molten raw material 16 in the preheating chamber 3. Here, the gasification component is a hydrocarbon-based compound (plastic), attached moisture, oil, hydroxide, or other gas generated by decomposition / evaporation, and the like. By preheating to a temperature range of 550 ° C. or more and 800 ° C. or less, gasification components in the dissolved raw material 16 can be sufficiently volatilized.
If the preheating temperature is lower than 200 ° C., the volatilization rate is low and it is difficult to volatilize sufficiently. On the other hand, if the preheating temperature exceeds 800 ° C., soot and the like are generated, which is not preferable. At that time, in order to prevent the generated gasification components from burning, it is preferable to control the oxygen concentration in the exhaust gas to be equal to or lower than the concentration that reacts with the gasification components.

Then, after removing the exhaust gas containing the gasification component, the exhaust gas is recovered by a gas recovery device (not shown). As the gas recovery device, a conventional device including a gas holder or the like can be used. However, in the gas recovery, the temperature of the exhaust gas introduced into the gas recovery device is determined by the decomposition temperature of the tar-based composition in the exhaust gas generated as a gasification component (1).
(Approximately 000 ° C.) or more to prevent adhesion of the tar-based composition in the gas recovery device. When the energy of the recovered gas is small, the energy may be adjusted by mixing and introducing a gas calorie modifier into the recovered gas. The recovered gas can be used as a fuel gas or a power generation gas.

Next, a second embodiment will be described with reference to FIG.
It will be described based on. FIG. 3 is a view showing an example of another embodiment of the present invention, and is a schematic longitudinal sectional view of an arc melting facility embodying the present invention. This DC arc melting equipment 1A
Has a preheating chamber 3a extending in the horizontal direction directly connected to the upper part of the melting chamber 2.

Inside the preheating chamber 3a, the molten raw material 16
Transport means such as a conveyor for transporting
2a is installed. Then, the opening / closing lid 20 and the opening / closing lid 20a installed in the preheating chamber 3a are alternately opened and closed, and the preheating chamber 3 is opened by an appropriate supply means (not shown) such as a pusher.
The melted raw material 16 charged in a is transported in the preheating chamber 3 a by the transporting means 12, 12 a, and charged in the melting chamber 2.

The preheating chamber 3a is provided with a duct 21 connected to a dust collector (not shown). The preheating chamber 3a also serves as a discharge passage for exhaust gas generated in the melting chamber 2. Therefore, in this DC arc melting equipment 1A, the melting raw material 16 supplied into the preheating chamber 3a is preheated by the exhaust gas from the melting chamber 2. Further, in the DC arc melting equipment 1A, a supply means for charging the melting raw material 16 into the preheating chamber 3a is necessary. However, the supply bucket 15 and the traveling in the DC arc melting equipment 1 shown in FIG. The cart 24 is not particularly required.

As described above, in the DC arc melting apparatus 1A, the preheating chamber 3a extending in the horizontal direction instead of the shaft type preheating chamber 3 is different from the DC arc melting apparatus 1 described above.
Are installed, and the supply bucket 15 and the traveling cart 2
4 is not installed, but the rest is the same as the DC arc melting equipment 1 shown in FIG. 1, and the same parts as the DC arc melting equipment 1 are denoted by the same reference numerals, and the description thereof is omitted.

The melting of the melting raw material 16 in the DC arc melting equipment 1A constructed as described above is performed basically in the same manner as in the first embodiment. That is, in the DC arc melting equipment 1A, the melted raw material 16 in the preheating chamber 3a is sequentially preheated by the exhaust gas generated from the melting chamber 2, and the gasified components in the melted raw material 16 are sufficiently gasified. 16 is introduced into the melting chamber 2 and melted by the arc 19. When the molten raw material 16 is charged into the melting chamber 2, new molten raw material 16 is sequentially supplied into the preheating chamber 3a, and the molten raw material 16 always stays in the preheating chamber 3a. Also in the second embodiment, it is preferable that the combustibles in the dissolved raw material 16 be recovered as a gas by the method described in the first embodiment.

By dissolving the scrap car waste, scrap car press scrap, or scrap household electrical waste as the dissolving raw material 16 in this manner,
It is possible to dissolve used cars and used home appliances without shredding, that is, to recycle used cars and used home appliances as iron sources without generating shredder dust. In addition, at the time of melting, the molten raw material 16 is charged into the melting chamber 2 after the gasified components are sufficiently volatilized in the preheating chamber 3a, and thus is included in the molten raw material 16 when charged into the molten metal 17. Rapid combustion and fuming of combustibles can be prevented.

In the above description, the case of DC arc melting equipment has been described. However, the present invention can be applied to AC arc melting equipment without any problem. Further, the positional relationship between the preheating chambers 3 and 3a and the tap 13 in the melting chamber 2 is not limited to the position 180 ° opposite to the center of the melting chamber 2 but may be 90 °. Also, the case of arc heating has been described as a heating source. However, as a heating source other than arc heating, gas burner heating, electric induction heating, plasma gas heating, or the like can be used.

[0044]

[Embodiment 1] An embodiment of the DC arc melting apparatus shown in FIG. 1 will be described below. The arc melting equipment has a melting chamber with a diameter of 7.2 m, a height of 4 m, and a preheating chamber with a width of 3
m, length 3.5m, height 2.5m, capacity of melting chamber is 1
80 tons.

First, 3 normal iron scraps were placed in the melting chamber.
At the same time, 0 tons were charged and 6 pieces (approximately 5 tons) of scrap car scrap were charged into the preheating chamber, and melting was started using a graphite upper electrode having a diameter of 30 inches and a maximum power supply capacity of 750 V and 130 kA. With the formation of the molten metal, quicklime and fluorite are added to form a molten slag, and then oxygen is blown at about 4500 Nm ³ / hr from an oxygen blowing lance, and coke is blown at about 60 kg / m from a carbon material blowing lance.
In was blown into the molten slag. The molten slag formed by the injection of oxygen and coke, and the tip of the upper electrode was buried in the molten slag. The voltage at this time is 45
It was set to 0V.

Thereafter, when the iron scrap in the melting chamber is melted and the gasified components in the waste car press waste in the preheating chamber are sufficiently gasified, the grate is released and the waste car press waste in the preheating chamber is introduced into the melting chamber. And melted by an arc. After the waste car press waste is put into the melting chamber, six new waste car press wastes are charged into the preheating chamber, and when the gasified components in the waste car press waste are sufficiently gasified, they are put into the melting chamber to be melted. This was repeated. Then, when about 180 tons of hot metal was generated in the melting chamber, the hot metal was heated by an arc, and about 60 tons of hot metal was left in the melting chamber, and the copper concentration was 1.27 mass% (hereinafter referred to as “%”). About 120 tons of hot metal having a carbon concentration of about 3% was poured into a ladle.

After the tapping, the hot metal was charged to two hot metal pots each containing 220 tons of blast furnace hot metal, and each hot metal was charged to 280 tons. Then, the mixed hot metal is charged into a 280-ton converter and subjected to oxygen blowing to obtain a copper-containing weatherable steel having a copper concentration of 0.3% and a carbon concentration of 0.03%.
The heat was melted and cast into a 250 mm thick slab cast by a continuous casting machine.

On the other hand, in the arc melting equipment, even after tapping 120 tons of hot metal, scrap scraps of scrap car are melted in the same manner as above, and when about 180 tons of hot metal is generated in the melting chamber, the hot metal is heated. After that, about 60 tons of hot metal is left in the melting chamber,
Hot metal with a copper concentration of 1.22% and a carbon concentration of about 3%
The tons were again poured into the ladle.

A total of 280 tons of the mixed hot metal obtained by mixing 10 tons of the hot metal and 270 tons of the blast furnace hot metal were charged into the converter and subjected to oxygen blowing to obtain a steel of ordinary steel having a copper concentration standard of 0.06% or less. Melt 12 heats, 250m with continuous casting machine
It was cast into a slab slab of m thickness. The average of the copper concentration of the molten steel in these 12 heats was 0.05%, which sufficiently satisfied the copper concentration standard.

[Embodiment 2] An embodiment of the DC arc melting apparatus shown in FIG. 3 will be described below. The arc melting equipment has a melting chamber with a diameter of 7 m, a height of 4 m, and a preheating chamber with a width of 1.5.
m, length 5m, height 1.5m, capacity of melting chamber is 180
Tons.

First, 3 normal iron scraps were placed in the melting chamber.
At the same time, 0 tons were charged and 6 pieces (approximately 5 tons) of scrap car scrap were charged into the preheating chamber, and melting was started using a graphite upper electrode having a diameter of 30 inches and a maximum power supply capacity of 750 V and 130 kA. With the formation of the molten metal, quicklime and fluorite are added to form a molten slag, and then oxygen is blown at about 4500 Nm ³ / hr from an oxygen blowing lance, and coke is blown at about 60 kg / m from a carbon material blowing lance.
In was blown into the molten slag. The molten slag formed by the injection of oxygen and coke, and the tip of the upper electrode was buried in the molten slag. The voltage at this time is 45
It was set to 0V.

Thereafter, when the iron scrap in the melting chamber is melted and the gasification components in the waste car press waste in the preheating chamber are sufficiently gasified, one waste car press waste closest to the melting chamber in the preheating chamber is removed. And melted by an arc. A new waste car press waste is charged to the preheating chamber at the end, and when the gasification components in the most advanced waste car press waste are sufficiently gasified, they are repeatedly injected into the melting chamber and dissolved. did. When about 180 tons of hot metal is generated in the melting chamber in this way, the hot metal is heated by an arc, and about 60 tons of hot metal is left in the melting chamber. The copper concentration is 1.27% and the carbon concentration is about 3 tons. Approximately 120 tons of hot metal was poured into a ladle.

After the tapping, the hot metal was charged to two hot metal pots each containing 220 tons of blast furnace hot metal, and each hot iron was charged to 280 tons. Then, the mixed hot metal is charged into a 280-ton converter and subjected to oxygen blowing to obtain a copper-containing weatherable steel having a copper concentration of 0.3% and a carbon concentration of 0.03%.
The heat was melted and cast into a 250 mm thick slab cast by a continuous casting machine.

On the other hand, in the arc melting equipment, even after tapping 120 tons of hot metal, the scrap scrap from the scrap car is melted in the same manner as above, and when about 180 tons of hot metal is generated in the melting chamber, the hot metal is heated. After that, about 60 tons of hot metal is left in the melting chamber,
Hot metal with a copper concentration of 1.22% and a carbon concentration of about 3%
The tons were again poured into the ladle.

A total of 280 tons of the mixed hot metal obtained by mixing 10 tons of the hot metal and 270 tons of the blast furnace hot metal were charged into the converter and subjected to oxygen blowing to obtain a steel having a copper concentration standard of 0.06% or less. Melt 12 heats, 250m with continuous casting machine
It was cast into a slab slab of m thickness. The average of the copper concentration of the molten steel in these 12 heats was 0.05%, which sufficiently satisfied the copper concentration standard.

[Embodiment 3] An embodiment in the DC arc melting equipment shown in FIG. 1 will be described below. The arc melting equipment has a melting chamber having a diameter of 5.5 m and a height of 3.5 m, a preheating chamber having a width of 3 m, a length of 3 m and a height of 7 m, and a capacity of the melting chamber of 80 tons.

First, 15 tons of non-pressed waste household electric appliances such as a refrigerator and a washing machine were charged into the melting chamber and the preheating chamber.
Arc melting started. With the production of the molten metal, quick lime and fluorite were added to form a molten slag, then oxygen was blown from an oxygen blowing lance, and coke was blown into the molten slag from a carbon material blowing lance to form the slag. .

Thereafter, the waste household waste in the melting chamber is dissolved,
When the gasification components in the waste household waste in the preheating room were sufficiently gasified, the grate was released, and the waste household waste in the preheating room was introduced into the melting chamber and melted by the arc. After the waste household waste is put into the melting room, new waste household waste is charged into the preheating room, and when the gasified components in the waste household waste are sufficiently gasified, the waste household waste is thrown into the melting room to be melted. Repeated. When about 80 tons of hot metal is generated in the melting chamber, the hot metal is heated by an arc, and about 20 tons of hot metal is left in the melting chamber. The copper concentration is 6.1% and the carbon concentration is about 3%. About 60 tons of hot metal was poured into a ladle.

After the tapping, the hot metal was charged into three hot metal pots each containing 260 tons of blast furnace hot metal, and each hot metal was charged to 280 tons. Then, the mixed hot metal is charged into a 280-ton converter and subjected to oxygen blowing to produce three heat components of the copper-containing weatherable steel having a copper concentration of 0.45% and a carbon concentration of 0.03%. Then, it was cast into a slab slab having a thickness of 250 mm by a continuous casting machine.

[0060]

According to the present invention, it is possible to recycle a large amount of used automobiles or used home appliances as an iron source without shredding, that is, to completely eliminate shredding and shredder dust disposal costs. In addition, it is possible to recycle used automobiles or used home electric appliances at low cost as an iron source, which brings an industrially significant effect.

[Brief description of the drawings]

FIG. 1 is a view showing an example of an embodiment of the present invention, and is a schematic longitudinal sectional view of an arc melting equipment embodying the present invention.

FIG. 2 is a schematic plan view of the arc melting equipment shown in FIG.

FIG. 3 is a view showing an example of another embodiment of the present invention, and is a schematic longitudinal sectional view of an arc melting equipment embodying the present invention.

[Explanation of symbols]

 Reference Signs List 1 DC arc melting equipment 1A DC arc melting equipment 2 Melting chamber 3 Preheating chamber 6 Furnace bottom electrode 7 Upper electrode 11 Grate 12 Conveyor 13 Tap hole 14 Slag port 16 Melting raw material 17 Melt 18 Melting slag 19 Arc

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C22B 7/00 F27D 13/00 F F27D 13/00 B09B 3/00 ZAB 303Z (72) Inventor Toshimichi Maki Tokyo 1-1-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) in Nihon Kokan Co., Ltd. 4D004 AA22 AA26 AC04 BA05 CA27 CA29 CB04 CB31 4K001 AA10 BA22 CA02 FA11 GA06 GA13 GB01 GB02 4K014 CB01 CB07 CC01 CC04 CC05 CD02 CD13 CD3 CD18 406 AA04 AA12 BA13 CA02 CA07 GA02 GA09 4K070 AA01 AA02 AB01 AC02 AC05

Claims (4)

[Claims] When melting waste car waste or waste car press waste or waste home appliance scrap obtained from a used automobile or used home appliance without performing shredder treatment in a melting chamber having a heating source as a melting raw material, A method for recycling used automobiles or used home appliances, wherein the raw material is preheated to gasify gasified components in the raw material, and then the raw material is introduced into the melting chamber and dissolved. 2. An exhaust gas generated in the melting chamber is introduced into the melting chamber, and a preheating chamber for preheating the melted raw material by the exhaust gas is directly connected to the gas chamber, and a gasification component is gasified in the preheating chamber. The method for recycling used cars or used home appliances according to claim 1. 3. The method for recycling used automobiles or used home appliances according to claim 1 or 2, further comprising: discharging the molten metal generated by melting the molten raw material from the melting chamber; A method for recycling used cars or used home appliances, which is mixed with hot metal and refined in a converter. 4. The method according to claim 1, wherein the heating source is arc heating.