JP2021138996A - Molten metal collection vessel and processing method of lithium ion secondary battery - Google Patents

Abstract

To collect molten metal which exits from a lithium ion secondary battery, in incineration disposal of a lithium ion secondary battery including metal whose melting point is 700°C to 1000°C, at a temperature greater than the melting point of the metal.SOLUTION: There is provided a molten metal collection vessel 1 used for an incinerator for performing incineration disposal of a lithium ion secondary battery W including metal whose melting point is 700°C to 1000°C, the vessel is formed into a shape on which the lithium ion secondary battery W is mounted and which receives molten metal exited from the lithium ion secondary battery W. An inner face of the collection vessel 1 is a fastening suppression face on which fastening of the molten metal is suppressed, and a support member 2 for lithium ion secondary battery W protruded upward from an inner face of a bottom of the collection vessel 1, is provided so that a support part 2a for supporting the lithium ion secondary battery W and a storage part 2b for storing the molten metal are formed at a position higher than the inner face of the bottom of the collection vessel 1.SELECTED DRAWING: Figure 6

Description

INDUSTRIAL APPLICABILITY The present invention flows out of a defective lithium ion secondary battery generated in the manufacturing process, and a lithium ion secondary battery that is discarded due to the equipment used and the life of the battery during incineration. The present invention relates to a technique for recovering molten metal (hereinafter, “molten metal”).

Lithium-ion secondary batteries are lighter, higher capacity, and higher electromotive force secondary batteries than conventional lead-acid batteries and Nikkado secondary batteries, and are used in mobile devices such as electric vehicles, mobile phones, and laptop computers. Widely used in.
_{Lithium cobalt oxide (LiCoO 2} ), lithium nickel oxide (LiNiO ₂ ), nickel-manganese-cobalt oxide, and the like are used as the positive electrode material of such a lithium ion secondary battery, and these are rare and valuable. It contains cobalt and nickel, which are substances. Therefore, it has been proposed to recover these valuable resources from a used lithium ion secondary battery and heat them to a temperature of 300 ° C. to 600 ° C. in an oxygen-containing gas stream for combustion treatment (Patent Document 1). reference).

By the way, when the incineration treatment temperature of the lithium ion secondary battery is high, there is a concern that a metal having a melting point lower than the incineration treatment temperature may flow out from the lithium ion secondary battery. If the spilled molten metal falls on the transport trolley, furnace wall, or hearth that transports the lithium-ion secondary battery, the molten metal may stick to the wheels or rails of the transport trolley, causing transport troubles, or the furnace wall or hearth. When the molten metal stuck to the hearth is peeled off, the furnace material may be worn.

Japanese Unexamined Patent Publication No. 10-8150

In the combustion treatment of Patent Document 1, the binder such as fluororubber is decomposed at about 300 ° C. to 400 ° C., and the conductive agent such as acetylene black and carbon is also oxidized and decomposed almost completely. On the other hand, at a combustion treatment temperature higher than 600 ° C., metal foil such as aluminum foil is oxidized, and a part of it becomes fine powder of aluminum oxide and is mixed with useful metal compound injection, and unoxidized fine aluminum. Since the foil is also mixed with a useful metal compound, there is a problem that it cannot be recovered as it is.

The present invention has been made in view of the above problems, and when a lithium ion secondary battery containing a metal having a melting point of 700 ° C. to 1000 ° C. is incinerated at a temperature higher than the melting point of the metal, the lithium ion secondary battery is formed. The purpose is to efficiently recover the molten metal flowing out of the next battery.

The present invention that solves the above problems is a molten metal recovery container used in an incinerator that incinerates a lithium ion secondary battery containing a metal that melts at 700 ° C. to 1000 ° C. at a temperature higher than the melting point of the metal. The lithium ion secondary battery is installed at the upper part and has a shape of receiving the molten metal flowing out from the lithium ion secondary battery, and the inner surface of the recovery container is a sticking suppressing surface that suppresses sticking of the molten metal. Above the bottom inner surface of the recovery container so that a support portion for supporting the lithium ion secondary battery and a storage portion for storing the molten metal are formed at a position higher than the bottom inner surface of the recovery container. It is characterized in that a support member for the lithium ion secondary battery is provided.

Further, the present invention from another viewpoint is a method for treating a lithium ion secondary battery in which a lithium ion secondary battery containing a metal that melts at 700 ° C. to 1000 ° C. is incinerated at a temperature higher than the melting point of the metal. The inner surface of the recovery container that receives the molten metal flowing out of the lithium ion secondary battery is used as a sticking suppressing surface that suppresses the sticking of the molten metal, and the inner surface of the bottom of the recovery container is higher than the inner surface of the bottom of the recovery container. A support member for the lithium ion secondary battery that projects upward from the inner surface of the bottom of the recovery container so that a support portion that supports the lithium ion secondary battery and a storage portion for storing the molten metal are formed at the position. The recovery container is placed on a transport mechanism, the lithium ion secondary battery is placed on the recovery container and incinerated, and then the molten metal stored in the storage unit is recovered.

When a lithium ion secondary battery containing a metal that melts at 700 ° C. to 1000 ° C. is incinerated at a temperature higher than the melting point of the metal, the molten metal that flows out from the lithium ion secondary battery can be recovered.

It is a figure which shows the schematic structure of the incinerator which concerns on embodiment of this invention. FIG. 5 is a cross-sectional view taken along the line AA in FIG. It is a figure for demonstrating operation of the transport carriage which concerns on embodiment of this invention. It is a figure for demonstrating operation of the transport carriage which concerns on embodiment of this invention. It is a figure for demonstrating operation of the transport carriage which concerns on embodiment of this invention. It is a top view which shows the schematic shape of the collection container which concerns on embodiment of this invention. In this figure, the lithium ion secondary battery is shown by a chain double-dashed line. FIG. 6 is a cross-sectional view taken along the line BB in FIG. FIG. 6 is a cross-sectional view taken along the line CC in FIG. In this figure, the lithium ion secondary battery is not shown. It is a top view which shows the schematic shape of the collection container which concerns on other embodiment of this invention. In this figure, the lithium ion secondary battery is shown by a chain double-dashed line. FIG. 9 is a cross-sectional view taken along the line DD in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

The molten metal recovery container 1 according to the present embodiment is used in an incinerator for a lithium ion secondary battery. As shown in FIG. 1, the incinerator 10 has a carry-in standby chamber 11 in which the lithium ion secondary battery W before the heat treatment stands by, a processing chamber 12 in which the lithium ion secondary battery W is heat-treated, and a processing chamber 12 after the heat treatment. It is provided with a carry-out standby chamber 13 in which the lithium ion secondary battery W stands by. A door 14 that can be opened and closed is provided between the carry-in waiting chamber 11 and the processing chamber 12 and between the processing chamber 12 and the carry-out waiting chamber 13. The processing chamber 12 includes a temperature raising unit 12a for heating the lithium ion secondary battery W, a temperature holding unit 12b for holding the temperature of the heated lithium ion secondary battery W, and cooling for cooling the lithium ion secondary battery W. It has a part 12c. The incinerator is not limited to continuous furnaces such as pusher type and conveyor type, and fixed furnaces such as box type, trolley type, elevator type, pit type, and pot type can also be used.

A plurality of exhaust pipes 15 for exhausting exhaust gas generated in the processing chamber are connected to the ceiling of the temperature raising unit 12a and the temperature holding unit 12b of the processing chamber 12 at intervals. Further, as shown in FIG. 2, a plurality of exhaust pipes 16 are also connected to the side wall portions of the temperature raising portion 12a and the temperature holding portion 12b of the processing chamber 12 at intervals. The exhaust pipe 15 and the exhaust pipe 16 are connected to the exhaust duct 17 shown in FIG. 1, and the exhaust gas exhausted by the exhaust pipes 15 and 16 is sent to an exhaust gas treatment device (not shown) via the exhaust duct 17. .. Further, as shown in FIG. 2, burners 18 are installed at regular intervals on the side wall portions of the temperature raising portion 12a and the temperature holding portion 12b of the processing chamber 12. Of the burners 18, those installed in the temperature holding portion (zones 3 to 8) use fuel oil as fuel, and the fuel oil can be blown into the furnace for processing. A water-cooled jacket 19 is provided on the ceiling and side walls of the cooling unit 12c of the processing chamber 12, and the lithium ion secondary battery W is cooled by heat exchange with water passing through a pipe arranged inside the water-cooled jacket. Will be done.

The lithium ion secondary battery W is moved in the furnace by the transport carriage 30 shown in FIG. A recovery container 1 for recovering the molten metal flowing out of the lithium ion secondary battery W is detachably mounted on the transport trolley 30, and the lithium ion secondary battery W is mounted on the recovery container 1. Be transported. The movement of the transport carriage 30 in the furnace is performed by the carriage extrusion device 40 provided in the carry-in standby chamber 11 and the carriage pull-out device 50 provided in the carry-out standby chamber 13.

The carriage extrusion device 40 includes a cylinder device 41 configured so that the cylinder rod 42 expands and contracts up and down, and a link mechanism 43 including a plurality of links 44 connected to the tip end portion of the cylinder rod 42. The link mechanism 43 is configured such that the tip end portion of the link mechanism 43 (the end portion of the link 44 located on the most downstream side of the transport line) moves in the horizontal direction in conjunction with the vertical movement of the cylinder rod 42. An extrusion member 45 that pushes the transport carriage 30 from the carry-in standby chamber 11 to the processing chamber 12 is attached to the tip of the link mechanism 43.
Further, as shown in FIG. 2, the carry-in standby chamber 11 is provided with an inlet traverser 31 for carrying the transport carriage 30 on which the lithium ion secondary battery W is mounted into the incinerator. As the cylinder device 41 of the carriage extrusion device 40, for example, a hydraulic cylinder is used. Further, in FIG. 2, the illustration of the carriage extruder 40 is omitted.

The bogie pull-out device 50 includes a cylinder device 51 configured so that the cylinder rod 52 expands and contracts up and down, and a link mechanism 53 composed of a plurality of links 54 connected to the tip end portion of the cylinder rod 52. The link mechanism 53 is configured such that the tip end portion of the link mechanism 53 (the end portion of the link 54 located on the most upstream side of the transport line) moves in the horizontal direction in conjunction with the vertical movement of the cylinder rod 52. At the tip of the link mechanism 53, a pull-out member 55 for pulling out the transport carriage 30 from the processing chamber 12 to the carry-out standby chamber 13 is attached.
The drawer member 55 is formed with a protruding portion 55a that protrudes upward, and is shaped so as to be caught on the lower surface portion of the transport carriage 30 when the cylinder rod 52 is extended. Further, as shown in FIG. 2, the carry-out standby chamber 13 is provided with an outlet traverser 32 for carrying out the transport carriage 30 on which the lithium ion secondary battery W is mounted to the outside of the incinerator. As the cylinder device 51 of the carriage pull-out device 50, for example, a hydraulic cylinder is used. Further, in FIG. 2, the illustration of the bogie pull-out device 50 is omitted.

The carriage 30 is moved by the carriage extrusion device 40 and the carriage extraction device 50 as follows. First, the transport vehicle 30 carrying the untreated lithium ion secondary battery W ₁ by the inlet traverser 31 is carried into the carry-standby chamber 11 as shown in FIG. 3, the cylinder rod 42 of the bogie extrusion device 40 as shown in FIG. 4 Stretches, and the tip of the cylinder rod 42 moves downward. Along with this, the extrusion member 45 of the carriage extrusion device 40 moves to the processing chamber side by the link mechanism 43 and comes into contact with the transport carriage 30. In this state, the cylinder rod 42 is further extended to push the transport carriage 30 out to the extrusion member 45, and the transport carriage 30 is carried into the processing chamber. At this time, the transport trolley 30 already in the processing chamber is moved by one transport trolley so as to be pushed by the transport trolley 30 newly carried into the processing chamber 12. By moving the transport trolley 30 in a billiard state in this way, the transport trolley 30 on which the processed lithium ion secondary battery W ₂ is mounted moves so as to be pushed out from the processing chamber 12. At this stage, part of the transport vehicle 30 loaded with processed lithium ion secondary battery W ₂ is in the state of being located below the door 14, it is impossible to close the door 14.

Subsequently, the cylinder rod 52 of the carriage pull-out device 50 extends, and the tip end portion of the cylinder rod 52 moves downward. Along with this, the drawer member 55 of the carriage pull-out device 50 moves to the processing chamber side, and the protruding portion 55a provided at the tip of the drawer member 55 engages with the lower surface of the transport carriage 30. When the cylinder rod 42 contracts in this state, _{the transport carriage 30 on which the processed lithium ion secondary battery W 2} is mounted is pulled by the drawer member 55 and moves to the carry-out standby chamber 13.

After that, as shown in FIG. 5, each door 14 is closed, and the lithium ion secondary battery in the processing chamber is incinerated. During this period, the transport trolley 30 that has moved to the carry-out waiting chamber 13 is carried out from the incinerator 10 by the outlet traverser 32. Then, outside the incinerator, the treated lithium ion secondary battery W ₂ and the untreated lithium ion secondary battery W ₁ were transshipped, and the untreated lithium ion secondary battery W ₁ was placed as shown in FIG. The transport trolley 30 is carried into the carry-in waiting room 11 by the entrance traverser 31.

The movement of the transport carriage 30 in the incinerator 10 of the present embodiment is performed in this way. Next, the molten metal recovery container 1 mounted on the transport carriage 30 will be described.

As shown in FIGS. 6 to 8, the collection container 1 of the present embodiment has a quadrangular shape in a plan view, has a bottom portion 1a and a side wall 1b, and has a shape such that the upper portion is open. That is, the recovery container 1 has a shape like a metal pan, and has a shape capable of receiving the molten metal flowing out from the lithium ion secondary battery W. The shape of the collection container 1 is not limited to a square shape. Further, for example, SUS304 is used as the material of the collection container 1, but a material other than metal may be used. The material of the recovery container 1 may be any material as long as the recovery container 1 is not damaged by the molten metal flowing out from the lithium ion secondary battery W.

A support member 2 for supporting the bottom surface of the lithium ion secondary battery W is provided on the inner surface of the bottom of the recovery container 1, and the support member 2 is shaped so as to project upward from the inner surface of the bottom of the recovery container 1. Have. As a result, as shown in FIG. 7, the support portion 1c that supports the lithium ion secondary battery W at a position higher in the vertical relationship in the vertical direction than the inner surface of the bottom of the recovery container 1 and the molten metal that has flowed out from the lithium ion secondary battery W. A storage unit 1d that receives and stores the storage unit 1d is formed.

Further, as the support member 2 of the present embodiment, the first support member 2a and the second support member 2b are provided on the inner surface of the collection container 1 so as to extend from one side wall 1b facing the other side wall 1b to the other side wall 1b. Has been done. The first support member 2a and the second support member 2b have different stretching directions. In the plan view shown in FIG. 6, the first support member 2a is arranged so that the vertical direction is the stretching direction and the first support member 2a is arranged in the horizontal direction at predetermined intervals. On the other hand, in the plan view shown in FIG. 6, the second support member 2b is arranged so that six are arranged in the vertical direction at predetermined intervals with the horizontal direction being the stretching direction. Since the first support member 2a and the second support member 2b are provided so as to be orthogonal to each other in this way, the storage portion 1d of the collection container 1 is divided into a plurality of regions. In other words, when the collection container 1 is sliced in a horizontal plane, the horizontal plane is divided into a plurality of regions by the support member 2.

The support member 2 has a shape that is sharpened from the inner surface of the bottom of the collection container 1 toward the tip in a cross-sectional view perpendicular to the stretching direction. As a result, the molten metal easily flows into the storage portion 1d, and the molten metal is less likely to accumulate between the lithium ion secondary battery W and the support member 2. As a result, it is possible to suppress sticking of the lithium ion secondary battery W due to solidification of the molten metal between the lithium ion secondary battery W and the support member 2. In the present specification, "the support member is sharp" means a shape in which the cross-sectional area of the horizontal cross section of the support member 2 gradually decreases as it approaches the tip of the support member 2, and is a point like the tip of a pin. In addition to the shape that points sharply, the shape that points linearly like the edge of paper is also included.

Further, a coating layer is formed on the inner surface of the recovery container 1 by applying a coating agent for suppressing the molten metal from sticking to the recovery container 1. When the molten metal is aluminum, COAT-AL manufactured by Yotai Co., Ltd. is used as the coating agent. One of the features of this embodiment is that a coating agent suitable for the molten metal recovery container 1 is used. In a normal lithium-ion secondary battery incinerator, a furnace material suitable for long-term continuous operation is selected in consideration of heat resistance, corrosion resistance against acid gas, and abrasion resistance, and the corrosion resistance against molten metal is high. Not usually considered. On the other hand, in the present embodiment, a coating agent used in dry metal smelting by melting in an electric furnace is used. Further, the configuration of the present embodiment in which the coat layer is provided on the metal surface is preferable from the viewpoint of ensuring the heat transfer property of the molten metal recovery container 1 and the strength in a high temperature environment and suppressing the cost for manufacturing. ..

Next, a method for processing the lithium ion secondary battery W using the molten metal recovery container 1 will be described.

First, a coating agent that suppresses sticking of molten metal is applied to the inner surface of the recovery container 1.

Subsequently, the recovery container 1 is placed on the transport carriage 30, and the lithium ion secondary battery W is placed on the recovery container 1. After that, the lithium ion secondary battery W is carried into the carry-in waiting chamber 11 shown in FIG. Subsequently, the lithium ion secondary battery W is conveyed to the temperature rising section 12a of the processing chamber 12 and heated to, for example, 850 ° C. or higher by a burner. After that, the lithium ion secondary battery W is transported to the temperature holding unit 12b of the processing chamber 12, and the lithium ion secondary battery W is held in a temperature range of, for example, 850 to 950 ° C. By holding the lithium ion secondary battery W for a predetermined time in the temperature holding unit 12b, the molten metal contained in the lithium ion secondary battery W can be efficiently recovered.

Here, since the temperature holding unit 12b is in a high temperature state, the metal having a melting point lower than the temperature of the temperature holding unit 12b melts while passing through the temperature holding unit 12b and flows out from the lithium ion secondary battery W. In the present embodiment, the temperature holding portion 12b is held in a temperature range of 850 to 950 ° C., but since this temperature is higher than the melting point of aluminum, when the lithium ion secondary battery W contains aluminum. Outflows aluminum from the lithium ion secondary battery W.

On the other hand, in the present embodiment, since the recovery container 1 is provided between the transport carriage 30 and the lithium ion secondary battery W, the molten metal flowing out from the lithium ion secondary battery W is received by the recovery container 1. be able to. Then, on the inner surface of the recovery container 1, the support member 2 separates the support portion 1c for supporting the lithium ion secondary battery W and the storage portion 1d for storing the molten metal, whereby the lithium ion secondary battery W is separated. The molten metal can be stored in the storage portion 1d while suppressing the adhesion of the molten metal between the support member 2 and the support member 2.

The lithium ion secondary battery W from which the molten metal has been removed by the temperature holding unit 12b is then cooled by the cooling unit 12c of the processing chamber 12 and carried out of the furnace via the carry-out standby chamber 13. Then, after carrying out the work of unloading the lithium ion secondary battery W from the transport carriage 30, the work of recovering the molten metal stored in the storage unit 1d of the recovery container 1 is performed. Since the temperature of the recovery container 1 at this stage is lower than the melting point of the metal melted in the temperature holding portion 12b, the molten metal is in a solidified state. Since the coating agent is applied to the inner surface of the recovery container 1, the solidified molten metal stored in the storage unit 1d can be easily peeled off with an iron spatula or the like. In this way, the molten metal flowing out of the lithium ion secondary battery W is recovered.

Further, in the present embodiment, the support member 2 of the recovery container 1 has a shape extending in one direction, and has a shape sharpened from the inner surface of the bottom of the recovery member toward the tip. This makes it easier to peel off the metal ingot from the collection container 1. Further, since the inner surface of the collection container 1 is configured such that the storage portion 1d is divided by the first support member 2a and the second support member 2b, the size of the metal ingot to be collected should be reduced. Can be done. That is, the weight of the recovered metal ingot can be reduced, and the recovery and transportation work can be easily performed.

Further, since the storage unit 1d is divided, a liquid layer of molten metal having a certain thickness is likely to be formed in each storage unit 1d. The molten metal stored at a certain thickness has a limited surface in contact with the atmosphere, and the state inside the liquid layer is likely to be stable. Further, when the molten metal is stored in a liquid layer, different metals are easily separated into the upper part and the lower part of the liquid layer due to the difference in specific densities. Further, since the region of each storage unit 1d becomes smaller due to the division of the storage unit 1d, it is difficult for a large incinerator falling from the lithium ion secondary battery W to be mixed into each storage unit 1d. That is, the recovery container 1 according to the present embodiment is used as a saucer for forming a liquid layer, thereby separating substances unnecessary for recovery of molten metal, suppressing mixing of large incinerators, and producing molten metal. Recovery can be efficient.

After the metal ingot is peeled off from the recovery container 1 and recovered, the coating agent is applied to the recovery container 1 again, and the next lithium ion secondary battery W is incinerated by the same procedure as the above procedure.

The processing method of the lithium ion secondary battery W of the present embodiment is performed as described above. As described above, according to the molten metal recovery container 1 according to the present embodiment, when the lithium ion secondary battery W containing a metal that melts at 700 ° C. to 1000 ° C. is incinerated at a temperature higher than the melting point of the metal. In addition, the molten metal flowing out of the lithium ion secondary battery W can be recovered. Further, in the present embodiment, since the lithium ion secondary battery W is in a stationary state and the recovery container 1 is also operated only by moving in the furnace, oxidation of the molten metal stored in the storage unit 1d is suppressed. Therefore, it is possible to recover a metal having the same composition as that of a pure metal. If the lithium ion secondary battery or the stored molten metal is moved by stirring or the like, the molten metal is oxidized due to the atmosphere in the furnace, which is not preferable.

In the present embodiment, the transport trolley 30 is used as the transport mechanism of the recovery container 1 on which the lithium ion secondary battery W is mounted, but the transport mechanism of the recovery container 1 is not limited to this. Other transport mechanisms such as roller conveyors and belt conveyors may be used as long as the recovery container 1 can be placed on the transport mechanism and moved in the furnace.

Further, in the present embodiment, in order to divide the storage portion 1d of the recovery container 1 into a plurality of regions, the support member so that the first support member 2a extending in one direction and the second support member 2b are orthogonal to each other. Although 2 is provided, the shape of each support member 2 is not limited to this, and is appropriately changed according to the quantity and shape of the lithium ion secondary battery W mounted on the recovery container 1.

Further, in the present embodiment, the support member 2 is provided so as to divide the storage portion 1d of the collection container 1 into a plurality of regions, but as shown in FIGS. 9 and 10, for example, the shape is such that the storage portion 1d is not divided. Support member 2 may be provided. In the examples shown in FIGS. 9 and 10, quadrangular pyramid-shaped support members 2 are arranged on the inner surface of the bottom of the collection container 1 at predetermined intervals. Even in such a recovery container 1, the support portion 1c that supports the lithium ion secondary battery W and the storage portion 1d that stores the molten metal can be separated. However, from the viewpoint of workability of the collection and transportation work, it is preferable to divide the storage unit 1d into a plurality of parts to reduce the weight of the collected metal ingot.

Further, in the present embodiment, the support member 2 is formed so as to be sharp from the inner surface of the bottom of the collection container 1 toward the tip, but the tip of the support member 2 may be flat. Even in this case, the support member 2 that supports the lithium ion secondary battery W and the storage portion 1d in which the molten metal is stored can be separated.
However, in order to suppress the sticking of the lithium ion secondary battery W due to solidification of the molten metal between the lithium ion secondary battery W and the support member 2, the tip of the support member 2 is formed to be sharp. Is preferable.

Further, in the present embodiment, the coat layer is formed by applying a coating agent to the inner surface of the recovery container 1, but if the recovery container 1 is made of a material in which molten metal does not easily adhere, the coating layer is provided. You don't have to. Further, even if the recovery container is made of a material in which the molten metal is hard to adhere, a coat layer may be formed on the inner surface of the recovery container. That is, if the inner surface of the recovery container 1 is a surface on which the sticking of the molten metal is suppressed (hereinafter, “sticking suppression surface”), the recovery container 1 is made of a material in which the molten metal is hard to stick and is fixed. Even if the restraining surface is formed, even if the sticking suppressing surface is formed by applying the coating agent to the inner surface of the recovery container 1, the molten metal as described in the present embodiment can be recovered. ..

Although the embodiments of the present invention have been described above, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention also includes them. It is understood that it belongs to.

The lithium ion secondary battery was incinerated using the molten metal recovery container according to the present invention. In this embodiment, aluminum flows out from the lithium ion secondary battery during the incineration process. The shape of the recovery container on which the lithium ion secondary battery is placed is as shown in FIG. 6, and the material of the recovery container is SUS304. The inner surface of the collection container was coated with a mixture of 2 kg of water and 2 kg of COAT-AL manufactured by Yotai Co., Ltd. Then, the aluminum ingot solidified in the storage part of the recovery container after the incinerator treatment was recovered, and its components were analyzed. The weight of each recovered aluminum ingot was 10 kg or less, which was a weight that could be carried by an operator.

The component analysis of the aluminum ingot was performed using an ICP emission spectroscopic analyzer iCAP6300 Dou View manufactured by Thermo Scientific. In this example, two types of aluminum A and aluminum B were prepared as test materials to be used for component analysis.
Here, the aluminum A is obtained by cutting a part of the aluminum ingot recovered from the recovery container and dissolving it in acid. Aluminum B is obtained by collecting and acid-dissolving foil-like or granular aluminum collected from a collection container. The results of component analysis of typical aluminum and copper of aluminum A and B are shown in Table 1 below.

As shown in Table 1, it can be said that aluminum A has high purity and good quality. Further, although aluminum B has a higher copper concentration than aluminum A, it can be said that it is a high-quality aluminum having market value. As can be seen from the results of this example, if the molten metal recovery container according to the present invention is used, it is possible to recover high-quality aluminum that can be recycled.

When the lithium ion secondary battery was incinerated using a recovery container without a support member, the aluminum accumulated in the recovery container solidified and adhered to the lithium ion secondary battery, and the aluminum was recovered. I couldn't.

The present invention can be applied to an incinerator treatment of a lithium ion secondary battery.

1 Molten metal recovery container 1a Bottom of recovery container 1b Side wall of recovery container 1c Support part of recovery container 1d Storage part of recovery container 2 Support member 2a First support member 2b Second support member 10 Incinerator 11 Carry-in waiting room 12 Processing chamber 12a Temperature raising unit 12b Temperature holding unit 12c Cooling unit 13 Carrying out standby chamber 14 Door 15 Exhaust pipe 16 Exhaust pipe 17 Exhaust duct 18 Burner 19 Water cooling jacket 30 Transport trolley 31 Inlet traverser 32 Outlet traverser 40 trolley extrusion device 41 Cylinder device 42 Cylinder rod 43 Link mechanism 44 Link 45 Extrusion member 50 Trolley drawer device 51 Cylinder device 52 Cylinder rod 53 Link mechanism 54 Link 55 Drawer member 55a Drawer member protrusion W Lithium ion secondary battery W ₁ Untreated lithium ion secondary battery W ₂ treated lithium ion secondary battery

Claims (11)

A molten metal recovery container used in an incinerator that incinerates a lithium ion secondary battery containing a metal that melts at 700 ° C. to 1000 ° C. at a temperature higher than the melting point of the metal.
It has a shape on which the lithium ion secondary battery is mounted and receives the molten metal flowing out of the lithium ion secondary battery.
The inner surface of the recovery container is a sticking suppressing surface that suppresses sticking of the molten metal.
The above projecting upward from the inner surface of the bottom of the recovery container so that a support for supporting the lithium ion secondary battery and a storage for storing the molten metal are formed at a position higher than the inner surface of the bottom of the recovery container. A molten metal recovery container provided with a support member for a lithium ion secondary battery. The molten metal recovery container according to claim 1, wherein the sticking suppressing surface is a surface of a coat layer formed on the inner surface of the recovery container and which suppresses sticking of the molten metal. The molten metal recovery container according to claim 1 or 2, wherein the support member is formed so as to be sharp from the inner surface of the bottom of the recovery container toward the tip end. The molten metal recovery container according to any one of claims 1 to 3, wherein the support member is formed so that the storage portion is divided into a plurality of regions. The molten metal recovery container according to any one of claims 1 to 4, wherein the molten metal is aluminum. A method for treating a lithium ion secondary battery, which incinerates a lithium ion secondary battery containing a metal that melts at 700 ° C. to 1000 ° C. at a temperature higher than the melting point of the metal.
The inner surface of the recovery container that receives the molten metal flowing out of the lithium ion secondary battery is used as a sticking suppressing surface that suppresses the sticking of the molten metal, and the bottom inner surface of the recovery container is located higher than the bottom inner surface of the recovery container. A support member for the lithium ion secondary battery that projects upward from the inner surface of the bottom of the recovery container so that a support portion for supporting the lithium ion secondary battery and a storage portion for storing the molten metal are formed in the above. Provide,
Place the collection container on the transport mechanism and place it.
After placing the lithium ion secondary battery on the recovery container and incinerating it,
A method for treating a lithium ion secondary battery, which recovers the molten metal stored in the storage unit. The method for treating a lithium ion secondary battery according to claim 6, wherein the sticking-suppressing surface is formed by applying a coating agent that suppresses sticking of the molten metal to the inner surface of the recovery container. The method for treating a lithium ion secondary battery according to claim 6 or 7, wherein the support member is formed so as to be sharp from the inner surface of the bottom of the collection container toward the tip. The method for treating a lithium ion secondary battery according to any one of claims 6 to 8, wherein the support member is formed so that the storage portion is divided into a plurality of regions. The method for treating a lithium ion secondary battery according to any one of claims 6 to 9, wherein the molten metal is aluminum. Any of claims 6 to 10, wherein the recovery container is carried out of the incinerator to recover the molten metal stored in the storage unit while the molten metal has flowed out and stored in the storage unit. The method for treating a lithium ion secondary battery according to item 1.

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