JP2020143330A - Copper recovery apparatus and recovery method from copper-containing waste material, and heat resistant vessel - Google Patents

Abstract

To recover copper from a copper-containing waste material safely and efficiently.SOLUTION: A copper recovery apparatus 1 from copper-containing waste materials includes a heat resistant vessel 2 equipped with an inner vessel 2A that houses copper-containing waste materials 40 (waste copper pipes) and has a plurality of openings 2a on the side face, and an outer vessel 2B housing the inner vessel, a heat treatment furnace 3 for heating the heat resistant vessel, and a vessel transport device 4 for introducing the heat resistant vessel into the heat treatment furnace and taking out the heat resistant vessel from the heat treatment furnace. The copper recovery apparatus may include an exhaust gas treatment apparatus for supplying a gas discharged from the heat treatment furnace to cement manufacturing equipment.SELECTED DRAWING: Figure 1

Description

The present invention is used for an apparatus and method for recovering copper from copper-containing waste such as piping of a device having a heat exchanger such as an air conditioner (air conditioner) and a refrigerator, and for recovering copper from copper-containing waste. Regarding heat-resistant containers.

In recent years, various recycling activities have been carried out from the viewpoint of resource depletion. In particular, metal recycling has been actively carried out for a long time. For example, in Patent Document 1, waste is roasted and screened, and then sorted by specific gravity difference sorting, eddy current, etc., and gold, silver, etc. A method for recovering valuable resources such as copper has been proposed.

On the other hand, most of the pipes filled with refrigerant (CFCs, etc.) and refrigerating machine oil for devices with heat exchangers are made of copper, and the inside contains refrigerating machine oil (mineral oil) around the pipes. Has a resin portion such as rubber as a heat insulating material. For example, about 40 m of copper piping is used per household air conditioner, and the amount of copper used increases as the thermal efficiency improves due to the spread of energy-saving products, the equipment becomes larger, and the installation distance between the main unit and the outdoor unit is extended. May increase. In addition, copper is the second most consumed metal after iron and aluminum, and in recent years it has become more widely used in lithium-ion batteries as copper foil, so consumption will increase with the spread of electric vehicles in the future, and copper recycling will occur. Is expected to become more and more important.

JP-A-2018-031062

However, in the method described in Patent Document 1, the work efficiency is low because the copper-containing waste is screened after roasting and then further sorted by specific gravity difference sorting, eddy current, or the like. In addition, oil is attached to the copper piping of the air conditioner, and if it is crushed as it is, it may ignite. Therefore, it is necessary to recycle it after detoxifying it. Furthermore, since harmful gases such as hydrogen fluoride and hydrogen chloride may be generated from the resin part such as rubber adhering to the copper pipe during roasting, it is necessary to treat the exhaust gas, and the treatment cost is high. There is a possibility of becoming.

Therefore, the present invention has been made in view of the above-mentioned problems in the prior art, and an object of the present invention is to recover copper from copper-containing waste safely and efficiently.

In order to achieve the above object, the present invention is a copper recovery device from copper-containing waste, which accommodates an inner container that contains copper-containing waste and has a plurality of openings on the side surfaces, and the inner container. It is characterized by including a heat-resistant container including an outer container, a heat treatment furnace for heating the heat-resistant container, and a container transport device for charging and discharging the heat-resistant container into the heat-resistant container.

According to the present invention, by accommodating the copper-containing waste in the inner container of the heat-resistant container and heating it, the copper is recovered in the inner container, and the additive contained in the resin portion in the waste is powdered in the outer container. Since it is possible to recover something other than copper, such as a body, copper can be safely and efficiently recovered from copper-containing waste.

The copper recovery device can be provided with an exhaust gas treatment device that supplies the gas discharged from the heat treatment furnace to the cement manufacturing device, whereby harmful substances such as hydrogen fluoride and hydrogen chloride are contained by heating the copper-containing waste. Even when gas is generated, it can be immobilized on the cement raw material in the cement manufacturing process to make it harmless.

Further, the present invention is a method for recovering copper from copper-containing waste, in which the inner container of a heat-resistant container including an inner container having a plurality of openings and an outer container for accommodating the inner container contains copper-containing waste. It is characterized in that an object is stored, the heat-resistant container is heated, copper is collected in the inner container of the heat-resistant container after heating, and something other than copper is collected in the outer container.

According to the present invention, by accommodating the copper-containing waste in the inner container of the heat-resistant container and heating it, the copper is recovered in the inner container, and the additive contained in the resin portion in the waste is powdered in the outer container. It is possible to recover things other than copper, such as the body, and it is possible to safely and efficiently recover copper from copper-containing waste.

By supplying the gas discharged from the heat treatment furnace to the cement manufacturing equipment, even if harmful gas containing hydrogen fluoride, hydrogen chloride, etc. is generated by heating the copper-containing waste, it can be used as a cement raw material in the cement manufacturing process. It can be fixed and rendered harmless.

Further, the present invention is a heat-resistant container which is heated in a heat treatment furnace after containing copper-containing waste, and is an inner container which contains copper-containing waste and has a plurality of openings on the side surfaces, and the inner container. It is characterized by including an outer container for accommodating. Using this heat-resistant container, copper can be recovered in the inner container, and anything other than copper can be safely and efficiently recovered in the outer container.

As described above, according to the present invention, copper can be safely and efficiently recovered from copper-containing waste.

It is an overall cross-sectional view which shows one Embodiment of the copper recovery device which concerns on this invention. It is an overall vertical sectional view which shows one Embodiment of the copper recovery apparatus which concerns on this invention. It is a vertical sectional view which shows the heat-resistant container used in the copper recovery apparatus which concerns on this invention. It is a cross-sectional view which shows the heat-resistant container just before being put into a heat treatment furnace. It is a vertical cross-sectional view which shows the heat-resistant container just before being put into a heat treatment furnace.

Next, an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, a case where copper is recovered from the copper piping of an air conditioner discarded as copper-containing waste will be illustrated.

As shown in FIGS. 1 and 2, the copper recovery device 1 from copper-containing waste according to the present invention includes a plurality of heat-resistant containers 2 for storing copper pipes, a heat treatment furnace 3, and a heat-resistant container 2 in the heat treatment furnace 3. It is provided with a container transport device 4 and the like for loading and unloading.

The heat treatment furnace 3 is a cylindrical vertical furnace, and is heated by four gas burners 8 (8A to 8D). Nozzles 11 (11A to 11D) are provided in the vicinity of the gas burner 8, and air A for combustion and cooling is supplied into the furnace by a fan (not shown). The hearth 17 of the heat treatment furnace 3 is rotated about a vertical axis by a hearth rotating device 19 provided with an electric motor (not shown), and is positioned at a predetermined position by a positioning sensor (not shown). A secondary combustion chamber, a chimney for exhaust, and the like are provided on the downstream side of the exhaust pipe 28.

An opening 7a is formed in a part of the furnace wall 7 of the heat treatment furnace 3 so as to be separated from the outside by a furnace body door 7b that can be opened and closed vertically. At a position facing the opening 7a, a container transport device 4 is provided in which the heat-resistant container 2 is put into the heat treatment furnace 3 from the opening 7a and the heat-resistant container 2 is discharged from the heat treatment furnace 3.

As shown in FIGS. 1, 2 and 5, the container transport device 4 extends in the direction on the line connecting the opening 7a of the heat treatment furnace 3 and the center of the heat treatment furnace 3 (left-right direction in FIG. 1), and the motor 18 A pusher portion 4a that abuts the heat-resistant container 2 and pushes the heat-resistant container 2 into the heat treatment furnace 3 by the forward rotation of the heat-treated container 2, and a claw 4c that locks the hanger 2c provided on the outer periphery of the inner container 2A of the heat-treated container 2 It is provided with a pull-out portion 4b for pulling out the heat-resistant container 2 from the heat treatment furnace 3 by the negative rotation of the motor 18. The pusher portion 4a is located directly above the pullout portion 4b.

Further, a slide base 21 that can be moved in the tangential direction (vertical direction in FIG. 1) of the heat treatment furnace 3 is provided, and the slide base 21 is in front of the furnace body door 7b by the base moving device 22 connected to the end portion. It is movable between the furnace front chamber 23 (position in FIG. 1) provided at the position and the stand 25 located on the outside of the furnace front chamber door 24 which can be opened and closed. The base moving device 22 moves the slide base 21 connected to the tip of the shaft 22b by moving the shaft 22b back and forth by driving the motor 22a.

The furnace front chamber 23 is separated from the outside by a furnace front chamber door 24 and is separated from the heat treatment furnace 3 by a furnace body door 7b so as to suppress a temperature change when the furnace body door 7b is opened. I have to.

As shown in FIGS. 3 to 5, the heat-resistant container 2 is composed of an inner container 2A and an outer container 2B, and has a heat-resistant temperature of at least 650 ° C. Further, the heat-resistant container 2 is preferably made of a metal alloy such as general structure rolled steel (SS), stainless steel (SUS304), or copper alloy having high thermal conductivity, but the heat generated when the waste LIB module M is heated in a rotary furnace. It is more preferable that the material is made of a material that can withstand a temperature of at least 650 ° C., such as stainless steel (SUS304).

The inner container 2A is formed in a cylindrical shape that opens upward and has a bottom surface, and has a large number of rectangular openings 2a on the side surfaces. The shape of the opening 2a is not limited to a rectangular shape. The size of the opening 2a is preferably 5 to 50 mm, more preferably 10 to 30 mm.

The outer container 2B is formed in a cylindrical shape that opens upward and has a bottom surface, and accommodates the inner container 2A. The hanger 2c projects from the peripheral surface 2b of the outer container 2B, and a plurality of wheels 2d are provided on the bottom surface.

Next, a copper recovery method from copper-containing waste using the copper recovery device 1 having the above configuration will be described.

The temperature inside the heat treatment furnace 3 is raised to 650 ° C., the furnace front chamber door 24 is opened, and the slide base 21 is advanced to the position of the stand 25 provided outside the furnace front chamber 23 via the base moving device 22. .. Then, using a crane (not shown), as shown in FIGS. 4 and 5, the heat-resistant container 2 in which the discarded copper pipe (hereinafter referred to as “waste copper pipe”) is stored is placed at the position of the stand 25. It is placed on the moved slide base 21.

The slide base 21 is retracted from the position of the stand 25 to the inside of the furnace front chamber 23 via the base moving device 22, the furnace front chamber door 24 is closed, the furnace body door 7b is opened, and the pusher portion 4a of the container transport device 4 ( (See FIG. 5) is advanced to put the heat-resistant container 2 into the heat treatment furnace 3. As a result, the heat-resistant container 2 is placed on the hearth 17 of the heat treatment furnace 3 at the 9 o'clock position in FIG.

After retracting the pusher portion 4a of the container transport device 4, the furnace body door 7b is closed, and the hearth 17 is rotated counterclockwise by 45 ° via the hearth rotating device 19.

By further repeating the above operation 7 times, as shown in FIG. 1, eight heat-resistant containers 2 are placed on the hearth 17 of the heat treatment furnace 3 with adjacent heat-resistant containers 2 at regular intervals. Is placed in a ring.

During the above operation, while the heat-resistant container 2 makes one round in the heat-resistant container 3, the waste copper pipe 40 in the heat-resistant container 2 is roasted, high-quality copper remains in the inner container 2A, and the waste copper pipe 40 When the additive contained in the resin portion inside is powdered and flows out from the opening 2a of the inner container 2A to the outer container 2B, it is possible to recover the substances other than copper in the outer container 2B. ..

When the heat-resistant container 2 makes one round in the heat-treated furnace 3, the furnace body door 7b is opened and the pull-out portion 4b of the container transport device 4 is advanced to the position of the heat-resistant container 2, and as shown in FIG. 5, the tip of the pull-out portion 4b is advanced. The claw 4c provided in the heat-resistant container 2 is locked to the hanger 2c provided in the heat-resistant container 2. Then, the pull-out portion 4b is retracted, the heat-resistant container 2 is pulled out from the heat treatment furnace 3 and placed on the slide base 21, and the furnace body door 7b is closed.

Next, after opening the furnace front chamber door 24, the slide base 21 on which the heat-resistant container 2 that has been heat-treated is placed is advanced to the position of the stand 25 via the base moving device 22. After that, the heat-resistant container 2 that has been heat-treated on the slide base 21 that has been moved to the position of the stand 25 is moved to a transfer conveyor (not shown) by a dedicated lift and carried to the next process.

After that, the slide base 21 is retracted to its original position again by the base moving device 22, and the furnace front chamber door 24 is fully closed.

In the above treatment method, the gas discharged through the exhaust pipe 28 of the heat treatment furnace 3 can be introduced into the region of 350 ° C. or higher of the preheater of the cement manufacturing apparatus. As a result, it is not necessary to provide a secondary combustion chamber, etc., and harmful gases such as hydrogen fluoride and hydrogen chloride generated by roasting waste copper pipes can be captured by the cement compounding raw material, and VOC (VOC) can be obtained. Volatile organic compounds) can also be burned, and unburned gas can be detoxified.

In the present embodiment, uniform heat treatment was performed by using the heat treatment furnace 3 in which the hearth 17 rotates, but the waste copper pipe 40 was roasted and high-quality copper was placed in the inner container 2A. As long as it is a heat treatment furnace that can be recovered, the hearth 17 does not necessarily have to rotate. Further, although a plurality of heat-resistant containers 2 are continuously put in and discharged into the heat treatment furnace 3, a batch type can also be applied. Further, the heat-resistant container 2 does not have to go around in the heat treatment furnace 3, and the heat-resistant container 2 may be discharged from the heat treatment furnace 3 after a predetermined time has passed.

Further, the heat-resistant container 2 containing the waste copper pipe 40 was put into the heat treatment furnace 3 in an oxidizing atmosphere for heat treatment, but the upper opening of the outer container 2A of the heat-resistant container 2 was closed to provide a small exhaust pipe. It may be heated in a reducing atmosphere or an inert atmosphere.

1 Copper recovery device from copper-containing waste 2 Heat-resistant container 3 Heat treatment furnace 4 Container transfer device 7 Furnace wall 8 (8A to 8D) Gas burner 11 (11A to 11D) Nozzle 17 Hearth 18 Motor 19 Hearth rotation device 21 Slide Base 22 Base moving device 23 Furnace front chamber 24 Furnace front chamber Door 25 Stand 28 Exhaust pipe 40 Waste copper pipe

Claims (5)

A heat-resistant container including an inner container for accommodating copper-containing waste and having a plurality of openings on the side surfaces, and an outer container for accommodating the inner container.
A heat treatment furnace that heats the heat-resistant container and
A copper recovery device from copper-containing waste, which comprises a container transport device for putting and discharging the heat-resistant container in the heat treatment furnace. The copper recovery device for copper-containing waste according to claim 1, further comprising an exhaust gas treatment device for supplying the gas discharged from the heat treatment furnace to the cement manufacturing device. Copper-containing waste is contained in the inner container of a heat-resistant container including an inner container having a plurality of openings and an outer container for accommodating the inner container.
The heat-resistant container is heated and
A method for recovering copper from copper-containing waste, which comprises recovering copper in the inner container of the heat-resistant container after heating, and recovering something other than copper in the outer container. The method for recovering copper from copper-containing waste according to claim 3, wherein the gas discharged from the heat treatment furnace is supplied to the cement manufacturing apparatus. A heat-resistant container that is heated in a heat treatment furnace after containing copper-containing waste.
An inner container that holds copper-containing waste and has multiple openings on the sides,
A heat-resistant container including an outer container for accommodating the inner container.

Images