JPH11246917A - Dry distillation metal recovery method and apparatus - Google Patents

Abstract

(57) [Problem] To not oxidize metals from waste materials of composite products composed of metal and polymer materials, such as coated cables and coated electric wires, coated with polymer materials such as synthetic resin and rubber. The present invention provides a dry distillation type metal recovery method and apparatus in which coke after recovering metal, that is, a steamed coating or the like can be easily treated. SOLUTION: Waste material of a composite product composed of a metal and a polymer material is stored in a waste material storage container 30 in an indirect heating type pyrolysis furnace 1 and carbonized in an inert gas atmosphere. Thereafter, the residue remaining in the waste material storage container 30 taken out of the furnace is dismantled to collect the metal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for oxidizing a metal from the waste material of a composite product composed of a metal and a polymer material, such as a coated cable or a coated wire, which is coated with a polymer material such as synthetic resin or rubber. TECHNICAL FIELD The present invention relates to a method and an apparatus for recovering a dry-distilled metal without recovering it.

[0002]

2. Description of the Related Art Generally, waste materials such as coated cables and coated electric wires covered with a polymer material such as synthetic resin or rubber contain valuable metal valuables such as copper and aluminum. Conventionally, such metal recovery has been performed by a manual or mechanical coating material peeling device.However, in the waste material, for example, a metal portion of a cable terminal, or crushed during transportation or handling. There are flattened ones and ones containing viscous substances such as jelly cables, and many of them cannot be processed by a mechanical coating material peeling device.

On the other hand, there has been proposed a dry distillation type oil refining apparatus for recovering oil by dry-distilling a polymer or organic waste material such as a covered electric wire or a cable covered with rubber or plastic, or a tire (Japanese Patent Application Laid-Open No. Hei 8 (1996) -1996). -188779).

[0004]

However, in this dry distillation type oil conversion apparatus, the residue after pyrolysis in a gas generating furnace is burned in a residue combustion chamber adjacent to the gas generating chamber under the introduction of outside air. However, the metal contained in the residue may be oxidized, and the commercial value may be reduced by half. In addition, in this dry distillation type oil conversion device, the residue burned in the residue combustion chamber is cooled and collected in a cooling water tank, so that the combustion ash of the metal and the coating material is wet with water, and the metal, especially the coating material, Post-treatment of the combustion ash may be troublesome.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to combine metal such as a covered cable or a covered electric wire covered with a polymer material such as synthetic resin or rubber. A metallurgical method for recovering metals from waste materials of composite products composed of polymer materials without oxidizing them, while easily treating the coke after collecting the metals, that is, steamed coatings and the like. And a device.

[0006]

In order to achieve the above object, the invention according to claim 1 is directed to an indirect heating method in which waste materials of a composite product composed of a metal and a polymer material are stored in a waste material storage container. It is stored in a pyrolysis furnace and carbonized in an inert gas atmosphere. After carbonizing, the residue remaining in the waste material container taken out of the furnace is dismantled to recover the metal.

[0007] The invention according to claim 2 has a configuration in which an inert gas is supplied into the indirect heating type pyrolysis furnace at the time when the dry distillation of the waste material is completed, and the pressure in the furnace is maintained so as not to become lower than the atmospheric pressure. Has become. The invention according to claim 3 increases the supply amount of the inert gas supplied into the indirect heating type pyrolysis furnace at the time when the dry distillation of the waste material is completed so that the pressure in the furnace does not become lower than the atmospheric pressure. It is configured to hold.

According to a fourth aspect of the present invention, a pyrolysis gas discharged from an indirect heating type pyrolysis furnace is introduced into a drum to remove high boiling substances, and then guided to a condenser to recover pyrolysis oil. It has become. The invention according to claim 5 is configured such that the pyrolysis oil is used as fuel for an indirect heating type pyrolysis furnace.

According to a sixth aspect of the present invention, there is provided an indirect heating type pyrolysis furnace for recovering a metal from a waste material of a composite product comprising a metal and a polymer material, wherein the waste material is stored in a waste material storage container. It is configured to be stored inside. According to a seventh aspect of the present invention, a waste material storage container is provided with a box-shaped frame, a tray provided in the frame, a side plate attached to a side surface of the frame, and a plurality of pieces disposed in a pyrolysis furnace. And a plurality of rows of supports attached to the frame so as to correspond to the rows of support guides.

As described above, according to the first aspect of the present invention,
The waste materials of composite products composed of metal and polymer materials are stored in a pyrolysis furnace while being stored in a waste material storage container, and carbonized in an inert gas atmosphere. Oxidation is hindered. After the carbonization, the residue remaining in the waste material storage container taken out of the furnace is subjected to thermal decomposition of the polymer material to form coke. Therefore, the coke is crushed to recover only the metal. The coke remaining after collecting the metal is buried in a landfill.

According to the second and third aspects of the present invention, in addition to the function of the first aspect of the present invention, since no outside air enters the pyrolysis furnace, there is no danger of explosion, and the operation can be performed safely. . According to the fourth aspect of the invention, the first aspect of the invention is provided.
In addition to the operation according to the invention described above, since the high-boiling cracked oil contained in the high-temperature pyrolysis gas is recovered in advance by the drum, it is possible to prevent the cooling pipe in the condenser from being clogged.

According to the fifth aspect of the invention, the fuel cost can be saved in addition to the effect of the first aspect of the invention. On the other hand, the invention according to claim 6 stores waste material of a composite product composed of a metal and a polymer material in an indirect heating type pyrolysis furnace in a state of being stored in a waste material storage container. While the structure is simple, it can be processed regardless of the shape of the waste material.

Further, since the waste material is stored in the waste material storage container, no residue due to dry distillation remains in the pyrolysis furnace. Therefore, it is not necessary to clean the inside of the pyrolysis furnace every time the carbonization is performed, so that the downtime can be reduced and the metal can be efficiently recovered. According to a seventh aspect of the present invention, in addition to the function of the sixth aspect, the waste material storage container is provided with a plurality of support members corresponding to a plurality of rows of support guides installed in the pyrolysis furnace. Therefore, the waste material storage container can be easily taken in and out of the pyrolysis furnace. Further, since the receiving tray is provided in the waste material storage container, there is no fear that solid matter such as coke will spill into the pyrolysis furnace.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, this dry distillation metal recovery apparatus is composed of three facilities: a pyrolysis furnace facility A, a pyrolysis oil recovery facility B, and a pyrolysis gas incineration facility C. The pyrolysis furnace equipment A includes a nitrogen generator (not shown), an indirect heating type pyrolysis furnace (hereinafter, referred to as a pyrolysis furnace) 1, a hot air generation furnace 2, a blower 3, an air compressor 4, and an oil supply pump 5. ,
It comprises a recovered oil tank 6 and a heavy oil tank 7.

The pyrolysis oil recovery facility B comprises a pyrolysis oil tank (hereinafter, referred to as a pyrolysis oil drum) 8, a condenser 9, a water sealing tank 10, a cooling tower 11, and a cooling water pump 12, and The gas incinerator C includes a pyrolysis gas incinerator 13 and a blower 3. As shown in FIG.
The pyrolysis furnace 1 mainly includes a horizontal furnace body 14 and a furnace body 14.
A door 15 attached to the opening of the furnace so as to be openable and closable,
And a heat insulating material 17 attached to the outside of each component.

As shown in FIG. 1, the pyrolysis furnace 1 includes an oxygen concentration detection sensor 18, a pressure sensor 19, and a temperature sensor 2.
0 to measure the oxygen concentration, pressure and temperature in the furnace body 14. Then, the first flow control valve 22 provided in the nitrogen gas supply pipe 21 is controlled based on the measurement value of the pressure sensor 19 to adjust the flow rate of the nitrogen gas a supplied into the furnace body 14. I have. Further, based on the measurement value of the temperature sensor 20, the second flow rate control valve 24 provided in the oil supply pipe 23, the third flow rate control valve 26 provided in the compressed air supply pipe 25, and the blower pipe 27 are provided. The fourth flow control valve 28 is controlled to supply the heavy fuel oil b or the thermally decomposed oil f to be supplied to the hot air generator 2, respectively.
The supply amounts of the compressed air for combustion c and the air for hot air d are respectively adjusted.

The branch pipe 2 branched from the oil supply pipe 23
Each of 3 'and 23 "is provided with a valve (not shown) to select a fuel oil. As shown in Fig. 2, a plurality of pyrolysis furnaces 1 (two in this example) ) Tray basket 30 can be accommodated.
The tray basket 30 is, as shown in FIGS.
A box-shaped frame 31 made of pipe, an oil pan 32 provided at the bottom of the frame 31, a side plate 33 attached to all sides of the frame 31, and a pair of cross sections attached to the lower surface of the frame 31 It is composed of a U-shaped support 34.

As shown in FIG. 3, inside the furnace body 14,
Guide roller 35 for supporting tray basket 30
Are provided in a plurality of rows (two rows in the present example).
4 is attached to the frame 31. The cross section of the support 34 is not limited to the U-shape, and may be, for example, an L-shape.
The point is that the support 34 may have a shape that does not derail from the guide roller 35. Further, the side plate 33 may be, for example, a punched metal or a net having an infinite number of holes and openings, capable of venting gas, and capable of preventing falling off of waste materials. In the case of this example, the side plate 33
Is mounted inside the frame 31.

A pair of left and right pipe-shaped guides 36 are provided inside the furnace body 14 in order to prevent the tray basket 30 from tipping over. Further, as shown in FIG. 2, a stopper 37 is provided at the back of the furnace body 14. As shown in FIG. 1, the high-temperature pyrolysis gas e that has exited from the furnace body 14 of the pyrolysis furnace 1 flows into the pyrolysis oil drum 8 from the pipe 40, and is heated while passing through the pyrolysis oil drum 8. The high-boiling cracked oil contained in the cracked gas e is left on the pyrolyzed oil drum 8. The pyrolysis gas e from which the high-boiling cracked oil has been removed is condensed with the pyrolysis oil f remaining in the pyrolysis gas e while passing through the condenser 9 erected on the pyrolysis oil drum 8. , Condenser 9
Flows down to the pyrolysis oil tank 8 below.

The pyrolysis gas e that has exited the condenser 9 is released from the pipe 41 into the water g in the water seal tank 10. The pyrolysis gas e that has left the water sealing tank 10 is supplied to the pyrolysis gas incinerator 13 via the pipe 42 and burned. While the LPG gas h is supplied to the pyrolysis gas incinerator 13 via the gas pipe 43,
Combustion air from the blower 3 is supplied from 7 '. The working water i of the cooling tower 11 is supplied to the condenser 9 by the cooling water pump 12.
And a part of the water is supplied through a branch pipe 44 to the water sealing tank 10.
Supplied to Also, the working water i supplied to the condenser 9 is
It is returned to the cooling tower 11 through the pipe 45.

The pyrolysis oil f of the pyrolysis oil drum 8 (including high-boiling-point cracked oil) is supplied to the recovered oil tank 6 through a pipe 46. It is to be taken out of the system from the pipe 47 if desired. On the other hand, hot-air exhaust gas j that has exited the heating jacket 16
Is supplied to the pyrolysis gas incinerator 13 via a pipe 48. In FIG. 1, reference numeral 49 denotes a working water supply pipe, and 50 denotes a hot air supply pipe.

Next, the metal recovery operation will be described. After storing a predetermined amount of waste material (not shown) such as a sheathed cable cut into a predetermined length in the tray basket 30, the tray basket 30 is placed in the furnace body 14 using a transportation means such as a forklift (not shown). Store in. At this time, the support 34 of the tray basket 30 is placed on the guide roller 35, and the tray basket 30 is pushed into the furnace body 14 using the rolling of the guide roller 35.

A predetermined number (2 in this example) is placed in the furnace body 14.
After the tray baskets 30 are stored, the door 15 of the pyrolysis furnace 1 is closed. Then, nitrogen gas a is supplied into the furnace body 14 to expel air in the furnace body 14. When the oxygen concentration in the furnace body 14 falls below the set value, hot air k is supplied from the hot air generator 2 to the heating jacket 16 of the pyrolysis furnace 1 to radiantly heat the waste material in the furnace body 14.

At this time, since the oxygen constituting the hot air is not supplied into the furnace body 14, the inside of the furnace body 14 can be maintained in a sufficient inert gas atmosphere, and the oxidation of the metal in the waste material can be ensured. Can be prevented. The temperature in the furnace body 14 is monitored by the temperature sensor 20 and the second, third, and fourth flow control valves 24, 26, and 28 are set to a set temperature (a temperature at which the covering material of the waste material is thermally decomposed). Is adjusted from time to time.

When the thermal decomposition of the waste material starts, the high-temperature pyrolysis gas e flows from the furnace body 14 into the pyrolysis oil drum 8, and the high-boiling cracking oil contained in the high-temperature pyrolysis gas e is thermally decomposed. It is left on the oil drum 8. The pyrolysis gas e from which the high-boiling cracked oil has been removed is supplied to a condenser 9 erected on a pyrolyzed oil drum 8.
, The pyrolysis oil f contained in the pyrolysis gas e condenses and flows down into the pyrolysis oil drum 8. The thermally decomposed oil f (including the decomposed oil having a high boiling point) is recovered in the recovered oil tank 6 as a by-product. On the other hand, the pyrolysis gas e that has exited the condenser 9 is supplied to the pyrolysis gas incinerator 13 via the water sealing tank 10 and incinerated.

When the carbonization time has elapsed, the hot-air generating furnace 2 is stopped, and the furnace body 14 is naturally cooled. Note that, if desired, only the blowing by the blower 3 may be continued, and the furnace body 14 may be forcibly cooled. Since the temperature inside the furnace body 14 is reduced and the inside of the furnace body 14 is depressurized, the nitrogen gas a is supplied into the furnace body 14 to avoid the inside of the furnace body 14 being depressurized, Eliminate flammable gases in 14.

If necessary, the amount of nitrogen gas a supplied into the furnace body 14 at the time of completion of the dry distillation of the waste material is increased so as to prevent the inside of the furnace body 14 from being reduced in pressure. Is also good. When the temperature inside the furnace body 14 reaches room temperature, the door 15 of the pyrolysis furnace 1 is opened, and as shown in FIG.
Are sequentially taken out of the furnace. Then, the residue remaining in the tray basket 30 is subjected to a sorting operation to collect metals such as copper, aluminum, and iron. Coke and the like remaining on the oil pan 32 are buried in a landfill.

When a predetermined amount of the pyrolysis oil f is stored in the recovery oil tank 6 by repeating the above-mentioned metal recovery operation in a batch system, the pyrolysis oil f is replaced with the heavy fuel oil b in the heavy oil tank 7.
Is used as fuel. Excess pyrolysis oil f that cannot be consumed by this device is extracted out of the system and used as appropriate. In the above description, the case where the pyrolysis gas e is incinerated in the pyrolysis gas incinerator 13 has been described, but the pyrolysis gas e may be stored in the storage tank 61 and used as fuel instead of incineration.
When the coating material is vinyl chloride, a neutralizing device 62 may be provided before the pyrolysis gas incinerator 13 to neutralize the pyrolysis gas e. In addition, the waste material can be processed without being cut into a fixed length and being wound in a loop shape.

[0029]

Example 1 As a result of subjecting 5 kg of a raw material (coated cable) to thermal decomposition using a horizontal tubular furnace having an inner diameter of 20 cm and a length of 100 cm, products shown in Table 1 were obtained. The surface of the copper in the product was not oxidized and could be evaluated as almost pure copper.

The operating conditions were a thermal decomposition temperature of 480 ° C., and thermal decomposition was performed for about 1 hour while introducing nitrogen gas into the furnace. The composition ratio of the raw materials is polyethylene 28 Wt%, vulcanized rubber 3 Wt%, copper 50 Wt%, aluminum 4 Wt%,
Iron was 15 Wt%.

[0031]

[Table 1]

Comparative Example 1 A test was performed under the same conditions as in Example 1. However, for comparison, when nitrogen gas was not supplied into the furnace, cracked oil,
The cracked gas yield was reduced. In addition, the surface of the copper was oxidized, and the quality was greatly reduced. The cause is presumed to be that the surface of the copper was oxidized by oxygen in the air. Comparative Example 2 A test was performed under the same conditions as in Example 1. However, when the pyrolysis gas was guided to the condenser to recover the pyrolysis oil, the condenser was clogged during the processing unless a drum was installed before (upstream) the condenser.

[0033]

As described above, according to the first aspect of the present invention, waste materials of a composite product composed of a metal and a polymer material are stored in a pyrolysis furnace while being stored in a waste material storage container. Since dry distillation is performed in an atmosphere of an inert gas, oxidation of the metal contained in the waste material can be prevented. Also,
The residue remaining in the waste material storage container taken out of the furnace after the carbonization is converted into coke by pyrolysis of the polymer material, so that only the metal can be easily recovered by crushing the coke portion.

According to the second and third aspects of the present invention, in addition to the effect of the first aspect of the present invention, since no outside air enters the pyrolysis furnace, there is no danger of explosion and the operation is safe. can do. According to the fourth aspect of the present invention, in addition to the function of the first aspect of the present invention, a high-boiling-point cracked oil contained in a high-temperature pyrolysis gas is previously recovered by a drum. Blockage of the cooling pipe in the condenser can be prevented.

According to the fifth aspect of the present invention, the fuel cost can be saved in addition to the effect of the first aspect of the present invention. On the other hand, according to the invention of claim 6, since the waste material of the composite product composed of the metal and the polymer material is stored in the waste material storage container in the indirect heating type pyrolysis furnace, the metal recovery is performed. While the structure of the apparatus is simplified, it can be processed regardless of the shape of the waste material.

Also, since the waste material is stored in the waste material storage container, no residue due to dry distillation remains in the pyrolysis furnace. Therefore, it is not necessary to clean the inside of the pyrolysis furnace every time the carbonization is performed, so that the downtime can be reduced and the metal can be efficiently recovered. According to the seventh aspect of the present invention, in addition to the operation of the sixth aspect, the waste material storage container has a plurality of support members corresponding to a plurality of rows of support guides installed in the pyrolysis furnace. Is provided, the waste material storage container can be easily taken in and out of the pyrolysis furnace. Further, since the receiving tray is provided in the waste material storage container, there is no fear that solid matter such as coke will spill into the pyrolysis furnace.

[Brief description of the drawings]

FIG. 1 is a system diagram of an apparatus used for performing a carbonization metal recovery method according to the present invention.

FIG. 2 is a sectional view of a pyrolysis furnace.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a front view of the tray basket.

FIG. 5 is a plan view of a tray basket.

FIG. 6 is a side view of the tray basket.

FIG. 7 is an explanatory view showing a state in which a tray basket is pulled out of a pyrolysis furnace by a forklift.

[Explanation of symbols]

1 indirect heating type pyrolysis furnace 30 waste material storage container

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor ▲ Yoshi ▼ Masami Taketake 1 Yawata Kaigan-dori, Ichihara-shi, Chiba Mitsui Engineering & Shipbuilding Co., Ltd. Chiba Works Co., Ltd. Shipbuilding Co., Ltd. Chiba Works

Claims (7)

[Claims] 1. A waste material of a composite product composed of a metal and a polymer material is stored in an indirect heating type pyrolysis furnace while being stored in a waste material storage container, and carbonized in an inert gas atmosphere.
After the carbonization, a carbonization-type metal recovery method in which the residue remaining in the waste material storage container taken out of the furnace is dismantled and the metal is recovered. 2. The carbonization metal according to claim 1, wherein an inert gas is supplied into the indirect heating type pyrolysis furnace at the time when the carbonization of the waste material is completed, and the pressure in the furnace is maintained so as not to become lower than the atmospheric pressure. Collection method. 3. The method according to claim 1, wherein when the dry distillation of the waste material is completed, the supply amount of the inert gas supplied into the indirect heating type pyrolysis furnace is increased so as to keep the pressure in the furnace from being lower than the atmospheric pressure. Item 7. The carbonization metal recovery method according to Item 1. 4. The dry distillation method according to claim 1, wherein the pyrolysis gas discharged from the indirect heating type pyrolysis furnace is introduced into a drum to remove high boiling substances, and then guided to a condenser to recover pyrolysis oil. Metal recovery method. 5. The dry distillation metal recovery method according to claim 4, wherein the pyrolysis oil is used as a fuel for an indirect heating type pyrolysis furnace. 6. When recovering metal from waste material of a composite product composed of metal and a polymer material, the waste material is stored in a waste material storage container in an indirect heating type pyrolysis furnace. Carbonized metal recovery equipment. 7. A waste material storage container is provided with a box-shaped frame, a tray provided in the frame, a side plate attached to a side surface of the frame, and a plurality of rows of supports installed in a pyrolysis furnace. 7. The dry distillation metal recovery apparatus according to claim 6, comprising a plurality of rows of supports mounted on the frame so as to correspond to the guides.