JP2003034826A - Iron source raw material for iron manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an iron source raw material for iron manufacture, which is supplied from scrap consisting of metal and resin, but does not generate hazardous substances for environment such as dusts, white smoke and dioxins, when melted in a smelting furnace as an iron source, though the scrap is not shredded and resins or the like in the scrap are not separated. SOLUTION: The objective iron source raw material 6 for iron manufacture is characterized by being worked and formed so that the metals may wrap the resins in scrap 1 consisting of metals and resins, when the scrap is worked and formed. The scrap does not need to be shredded. Waste automobiles or waste household electric appliances can be used for the scrap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron source raw material for iron making, which is obtained from a waste containing resin as a constituent substance, such as used automobiles and used electric home appliances, and used in a refining furnace such as a converter or an electric furnace. More specifically, the present invention relates to an iron source material for iron making, which can reduce the generation of soot, dioxin, etc. without separating the resin in the waste.

[0002]

2. Description of the Related Art Conventionally, used automobiles are shredded after valuable parts such as batteries and tires have been removed, sorted by magnetic separation and reused as iron sources. Plastic during this shredder process,
Shredder dust containing rubber, iron, aluminum, copper, etc. is generated. Also, used home appliances are shredded after removing the motor and coolant, and reused as an iron source.
Shredder dust containing a mixture of rubber, iron, aluminum, copper, etc. is generated. The shredder dust thus generated 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.

[0004] Against this background, many methods have been proposed for reusing wastes such as used automobiles and used home appliances without shredding. For example, JP-A-10
Japanese Patent Laid-Open Publication No. 195516 (hereinafter referred to as "Prior Art 1") discloses a melting method in which an approximately prototype used automobile, in which only a liquid is extracted in advance, is press-molded and which is blended in a steel-making melting furnace as iron scrap. Japanese Patent Laid-Open No. Hei 10
Japanese Patent Publication No. 47635 (hereinafter referred to as "Prior Art 2") discloses a method in which a used automobile from which valuable components and dangerous substances are removed is entirely steamed and baked, and a combustible substance is thermally decomposed to separately collect iron and copper. Japanese Patent Laid-Open No. 10-
No. 30112 (hereinafter referred to as "Prior Art 3")
Disclosed is an iron source / fuel body for iron making, which is produced by pressing metal product waste and tire waste or synthetic resin product waste into a rectangular parallelepiped shape.

[0005]

Although the prior arts 1 to 3 do not require the shredder treatment of wastes such as used automobiles and used home appliances, the prior arts 1 to 3 have the following problems.

That is, in the prior art 1, the resin is also exposed on the surface of the press-molded product of the used automobile, and when the press-molded product was charged into the converter, the resin contacted the hot metal. It instantly gasifies to generate environmentally harmful substances such as soot, white smoke and dioxins. In a normal converter, the furnace body is inclined when charging iron scrap and hot metal, and the absorption port of the exhaust gas treatment equipment and the converter furnace port do not match,
Part of the generated gas leaks into the building. Although it can be said that the entire building is dust-collected, it is extremely unfavorable that gas containing soot, dioxin, etc. leaks into the work environment, and therefore, in order to suppress the amount of gas generated to the extent that it is sucked into the exhaust gas treatment facility, It is necessary to limit the charging amount of press-formed products. On the other hand, in the electric furnace, the atmospheric temperature is lower than in the converter, so the gasification of the resin is slow, and although it can be sucked by the existing exhaust gas treatment equipment, the harmful substances remain undecomposed due to the low exhaust gas temperature. There is a concern that it will be released into the atmosphere, and it is necessary to install a device that removes harmful substances as part of the exhaust gas treatment facility.

In the prior art 2, a facility for steaming and burning a used automobile as a whole is required, and a facility for processing gas generated from the resin is also required, so that an extremely high facility cost is required. Further, in Prior Art 3, the resin is exposed on the surface of the iron source / fuel body for iron making, which is a press-formed product, and therefore there is the same problem as in Prior Art 1.

The present invention has been made in view of the above circumstances.
The purpose is to obtain an iron source raw material for iron making, which is obtained from waste containing resin as a constituent material of used automobiles and used home appliances, and is melted as an iron source in refining furnaces such as converters and electric furnaces. In the above, without using shredder treatment of the waste and separating the resin, etc. in the waste, it does not generate environmentally harmful substances such as soot dust, white smoke and dioxins when dissolved in the refining furnace. It is to provide an iron source raw material for iron making that can be performed.

[0009]

The iron source raw material for iron making according to the first invention is an iron source raw material for iron making which is formed by processing and molding a waste containing a resin, and the resin in the waste is Is processed and molded so as to be covered with metal, and the iron source material for iron making according to the second invention is characterized in that in the first invention, the waste is not shredded. The iron source material for iron making according to the third invention is characterized in that, in the first invention or the second invention, the outer surface thereof is processed / molded so as to be covered with a steel plate that constitutes waste. The iron source material for iron making according to the fourth invention is processed or processed in the first invention or the second invention so that the outer surface thereof is covered with a separately prepared steel plate or steel foil.
The iron source material for iron making according to the fifth invention, in any one of the first invention to the fourth invention, characterized in that the waste is a used automobile or a used household electric appliance. It is characterized by.

In the present invention, the waste containing resin as a constituent substance, such as used automobiles and used home appliances,
Processed so that the resin contained in the waste is not exposed on the surface.
It is molded, and this molded product is used as an iron source material for iron making. Since the surface of this molded product is covered with metal, the rapid temperature rise of the resin when charged into a refining furnace such as a converter or an electric furnace is prevented, and the rapid gasification of the resin is suppressed. Then, since smelting is gradually gasified after the furnace temperature reaches a sufficiently high temperature after starting refining, environmentally harmful substances such as soot dust, odor and dioxin generated with gasification are decomposed in the exhaust flue, It is possible to prevent scattering of these harmful substances into the atmosphere without installing a special device such as a dioxin removing device.

[0011] Such a molded product can be obtained by processing and molding so that the steel plate is exposed on the outer surface of a waste product such as a used automobile, which is frequently used for the outer casing. On the other hand, a waste product such as some home appliances in which a steel plate is not often used for the exterior can be obtained by wrapping it in a separately prepared steel plate or steel foil, and further by wrapping it and then compression-molding it. By treating the waste material in this way, the shredder treatment of the waste material becomes unnecessary.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show the first embodiment of the present invention.
FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 1 is a schematic view showing a processing / forming step for producing an iron source material for iron making according to the present invention from a used automobile, and FIG. 2 is a used automobile for a press forming apparatus. It is a perspective view which shows a mode that charging is carried out.

A substantially prototype used automobile 1 from which valuable components such as batteries and tires that can be easily removed and liquid such as cooling water have been removed is loaded into a press molding apparatus 2 using a working vehicle 3. . In this case, the lid 4 is operated so that the bottom surface of the used automobile 1 is on the outside of the press-molded body and the top surface is on the inside of the press-molded body for press-molding. This can be achieved, for example, by adjusting the charging angle of the used automobile 1 into the press molding apparatus 2 as shown in FIG. Then, the flat-shaped molded body molded in this manner is press-molded by the piston type press 5 to a size that can be charged into a refining furnace such as a converter or an electric furnace to obtain an iron source raw material 6 for iron making.

By producing the iron source material 6 for iron making in this manner, in the iron source raw material 6 for iron making, the steel plate at the bottom of the used automobile 1 covers the surface, and the interior resins such as sheets are The area that is pressed inside and exposed on the surface of the resin is extremely small. The exposed area of the resin with respect to the entire surface area is 20 to 40% before press molding, whereas it is 0 to 7% by molding in this way, which can be reduced to about 1/6 or less. .

Therefore, even if the iron source material 6 for iron making is charged into a refining furnace such as a converter or an electric furnace, a rapid temperature rise of the resins contained in the iron source material 6 for iron making is prevented, The rapid gasification of is suppressed. After the refining starts and the temperature in the furnace reaches a sufficiently high temperature, it is gradually gasified, so environmentally harmful substances such as soot, odor and dioxins generated by gasification are decomposed in the exhaust flue and It is possible to prevent scattering of these harmful substances into the atmosphere without installing a removing device.

The used automobile 1 shown in FIG. 1 is almost the original form, but it is also possible to use a partially disassembled one or one cut into two or more parts. Also, a large number of copper members are arranged as conductive materials in automobiles, and since these copper members increase the copper concentration of molten steel after melting, even if the copper members are removed from the used automobile in advance and then press-molded. good.

Next, a second embodiment will be described. 3 and 4 are views showing a second embodiment of the present invention, and FIG. 3 is a schematic view showing a working / forming step of producing an iron source material for iron making according to the present invention from a used home electric appliance. ,
FIG. 4 is a perspective view showing how used home appliances are loaded into the press molding apparatus.

A steel plate or steel foil 8 is laid in advance in the press forming apparatus 2, and the used home electric appliances 7 from which the motor, the coolant and the like have been removed by using the working vehicle 3 are installed in the press forming apparatus 2 as a steel plate or Charge onto the steel foil 8. If there is no part to be removed, insert it as it is. After loading the used home appliances 7, the used home appliances 7
Is covered with a steel plate or a steel foil 8 so as to wrap it, and the lid 4 is operated to perform press molding. Further, if necessary, the piston type press 5 is used for press forming to obtain an iron source raw material 9 for iron making.

By producing the iron source material 9 for iron making in this manner, the steel sheet or the steel foil 8 covers the surface of the iron source material 9 for iron making, and the area where the resins contained in the household electrical appliances are exposed on the surface. Can be 6% or less of the whole.

Therefore, even if the iron source material 9 for iron making is charged into a refining furnace such as a converter or an electric furnace, a rapid temperature rise of the resins contained in the iron source material 9 for iron making is prevented, and The rapid gasification of is suppressed. After the refining starts and the temperature in the furnace reaches a sufficiently high temperature, it is gradually gasified, so environmentally harmful substances such as soot, odor and dioxins generated by gasification are decomposed in the exhaust flue and It is possible to prevent scattering of these harmful substances into the atmosphere without installing a removing device.

A large amount of copper members as conductive materials are also arranged in home appliances, and since the copper members increase the copper concentration of molten steel after melting, the copper members are removed from the used home appliances 7 in advance, and then pressed. It may be molded. or,
The tire of the used automobile 1 shown in FIG. 1 described above is removed, but when the tire is not removed, the outer surface may be covered with the steel plate or the steel foil 8 as in the second embodiment.

The present invention is not limited to the above description, but various modifications can be made. For example, a used car 1
The used electric home appliance 7 may be mixed and press-molded, and ordinary iron scrap may be mixed. or,
The manufacturing method is not limited to the above. For example, instead of the lid 4, a piston that moves in the vertical direction may be provided and pressing may be performed using this.

[0023]

[Examples] The iron source material for iron making, which was manufactured by processing and molding a used automobile from which liquids such as batteries, tires and cooling water were removed by the method shown in FIG. 1 described above, a motor and a coolant were removed. The used household electric appliances were used in a converter with the iron-making iron source material prepared by the method shown in FIG. 3 described above, and the state of soot and odor generation and the state of dioxin generation at that time were investigated. Dust was detected visually, odor was detected olfaction, and dioxin was investigated by chemical analysis.

For comparison, a conventional iron source for iron making is produced by press-molding a used automobile from which liquids such as batteries, tires and cooling water have been removed without taking care to cover the outer surface with a steel plate. Raw material (same as prior art 1)
A test was also conducted using an iron source raw material for iron making, which was produced by press-molding a used home electric appliance from which a motor and a coolant were removed without using a steel plate or the like.

The exposed area of the resin with respect to the total area of the iron source raw material for iron making is 2% in the iron source raw material for iron making according to the present invention made from a used automobile, and the iron making iron according to the present invention made from a used household electric appliance. It was 1% in the source material.
On the other hand, it was 26% in the conventional iron source raw material for iron making made from used automobiles, and 31% in the iron source raw material for iron making made from used home electric appliances without using steel plates and the like.

Table 1 shows the results of an investigation of the release of soot dust, odor, and dioxin into the atmosphere when these iron source materials for iron making were used. In Table 1, a test using the iron source material for iron making according to the present invention is shown as an example, and a test using a conventional iron source material for iron making is shown as a comparative example. Also, Table 1
Also shows the results of the normal refining without using the iron source material for iron making made from used automobiles and used home appliances. In Table 1, this refining is indicated as a conventional example, and in this case, the resin is used. Since it does not generate soot dust or odor, it is not listed in Table 1.

[0027]

[Table 1]

As shown in Table 1, in the comparative example, environmentally harmful substances are discharged into the atmosphere at the beginning of operation, and unless a facility for removing dioxins is installed, used automobiles and used home appliances Although it was impossible to use as an iron source, in the examples, the amount of environmentally harmful substances generated is exactly the same as in the conventional example, and exhaust gas treatment equipment that does not have equipment for removing dioxins, etc. However, it was found that it is possible to recycle used automobiles and used home appliances as iron sources.

[0029]

EFFECTS OF THE INVENTION According to the present invention, wastes such as used automobiles and used home appliances that contain resin as a constituent substance are not shredded, and environmentally harmful substances such as soot, odor and dioxin. It becomes possible to recycle and use as an iron source material for iron making while preventing the release of iron. This makes it possible for iron makers to reduce manufacturing costs by using inexpensive iron source materials.
In addition, it becomes possible to safely and inexpensively process the waste containing the resin, which has been difficult or expensive for the society as a whole due to environmental problems, which brings about an industrially remarkable effect.

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of the present invention and is a schematic view showing a working / forming step of producing an iron source material for iron making according to the present invention from a used automobile.

FIG. 2 is a diagram showing the first embodiment of the present invention, and is a perspective view showing a state in which a used automobile is loaded into a press molding apparatus.

FIG. 3 is a view showing a second embodiment of the present invention, and is a schematic view showing a working / forming step of producing an iron source material for iron making according to the present invention from a used home electric appliance.

FIG. 4 is a view showing a second embodiment of the present invention, and is a perspective view showing a state where a used home electric appliance is loaded into the press molding apparatus.

[Explanation of symbols]

1 used car 2 Press molding equipment 3 Working vehicles 4 lid 5 piston type press 6 Iron source raw material for iron making 7 Used home appliances 8 Steel plate or steel foil 9 Iron source raw material for iron making

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tadaaki Hino             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. F-term (reference) 4D004 AA07 AA22 AA26 BA03 BA05                       CA03 CB15                 4K001 AA10 BA22 CA00 DA01 GA06                       GA16

Claims (5)

[Claims] 1. An iron source material for iron making, which is formed by processing and molding a waste material containing a resin, wherein the resin in the waste material is processed and molded so as to be covered with a metal. An iron source material for iron making. 2. The iron source raw material for iron making according to claim 1, wherein the waste is not shredded. 3. The iron source raw material for iron making according to claim 1 or 2, wherein the outer surface is processed and molded so as to be covered with a steel plate that constitutes waste. 4. The iron source raw material for iron making according to claim 1, wherein the outer surface is processed and molded so as to be covered with a separately prepared steel plate or steel foil. 5. The iron source raw material for iron making according to claim 1, wherein the waste is used automobiles or used home appliances.