Metal recovery device, metal recovery method, and pouch unit

Abstract

This technology provides an efficient method for recovering target metals. [Solution] The metal recovery device 1 is a device for recovering target metal. The metal recovery device 1 comprises a pouch unit 10 and a liquid delivery unit 30. The pouch unit 10 has a carrier 12 to which powder capable of adsorbing target metal is pre-attached, and a pouch 11 containing the carrier 12. The liquid delivery unit 30 supplies a dissolution solution in which the target metal is dissolved into the pouch 11.

Description

Technical Field

[0001] The subject matter disclosed in this specification relates to a metal recovery device, a metal recovery method, and a pouch unit.

Background Art

[0002] In recent years, metals such as rare metals or precious metals have been recovered from wastes such as shredded E-waste (waste electrical and electronic equipment). Techniques for recovering such metals are broadly classified into dry smelting and wet smelting. Dry smelting is a method of melting waste in a high-temperature furnace to recover metals, and wet smelting is a method of dissolving and recovering metals contained in waste with chemical solutions such as acids and alkalis. Generally, wet smelting is more energy-saving and environmentally preferable than dry smelting. The method of wet smelting is disclosed in, for example, Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when microorganisms are directly added to the extract as in Patent Document 1, it is necessary to separate and recover the microorganisms from the extract after adsorption. As methods for separating microorganisms from the extract, a centrifugation method and a filtration method can be considered, but each has problems.

[0005] For example, centrifugal separation is time-consuming, making it difficult to efficiently recover the target metal. Furthermore, the high cost of introducing and operating centrifugal separation equipment makes processing large quantities of extract difficult. Filtration also requires considerable processing time and increases maintenance work, such as filter paper replacement. Additionally, clogging of the filter paper reduces the recovery rate of microorganisms. Therefore, there is a need for technologies that can efficiently recover the target metal.

[0006] The purpose of this disclosure is to provide a technology that can efficiently recover a target metal. [Means for solving the problem]

[0007] To solve the above problems, the first embodiment is a metal recovery device for recovering a target metal, comprising a pouch unit including a carrier to which a powder capable of adsorbing the target metal is pre-attached, and a pouch containing the carrier, and a liquid supply unit for supplying a solution in which the target metal is dissolved into the pouch.

[0008] The second embodiment is a metal recovery apparatus according to the first embodiment, wherein the liquid delivery unit discharges the dissolving solution from inside the pouch.

[0009] A third embodiment is a metal recovery apparatus according to the second embodiment, further comprising a chamber capable of housing the pouch unit and a pressure adjustment unit for pressurizing the inside of the chamber.

[0010] A fourth embodiment is a metal recovery apparatus according to the third embodiment, wherein the pressure adjustment unit reduces the pressure in the chamber.

[0011] The fifth embodiment is a metal recovery apparatus according to any of the first to fourth embodiments, wherein the pouch unit is detachably replaceable with respect to the liquid delivery unit.

[0012] The sixth embodiment is a metal recovery apparatus according to the fifth embodiment, wherein the pouch unit has an inlet port for introducing the dissolving liquid into the pouch and an outlet port for releasing the dissolving liquid from inside the pouch.

[0013] The seventh aspect is a metal recovery device according to the sixth aspect, wherein the inlet port and outlet port each have a check valve.

[0014] The eighth aspect is a metal recovery apparatus according to the sixth or seventh aspect, wherein the pouch unit further has an inlet pipe extending from the inlet port and inserted into the pouch, the inlet pipe having a discharge port above the carrier for discharging the dissolving liquid into the pouch.

[0015] The ninth embodiment is a metal recovery apparatus according to any of the first to eighth embodiments, wherein the liquid delivery unit includes a circulation unit that discharges the dissolving liquid from the pouch and returns the dissolving liquid to the pouch.

[0016] The tenth embodiment is a metal recovery apparatus according to any of the first to ninth embodiments, wherein the powder is a microorganism or a component derived from a microorganism.

[0017] The eleventh aspect is a metal recovery method for recovering a target metal, comprising the step of supplying a solution in which the target metal is dissolved into a pouch of a pouch unit containing a carrier to which a powder capable of adsorbing the target metal is pre-attached.

[0018] The twelfth embodiment is a pouch unit comprising a carrier to which a powder capable of adsorbing a target metal is pre-attached, and a pouch capable of containing a solution in which the carrier and the target metal are dissolved. [Effects of the Invention]

[0019] According to the metal recovery apparatus of the first to ninth embodiments, the target metal can be adsorbed onto a carrier by supplying a dissolving solution to a pouch unit. This allows for efficient recovery of the target metal.

[0020] According to the metal recovery device of the second aspect, by discharging the dissolution solution from the pouch, dehydration of the carrier becomes easy.

[0021] According to the metal recovery device of the third aspect, by pressurizing the inside of the chamber, the pouch becomes more likely to collapse. Thereby, dehydration of the carrier can be promoted.

[0022] According to the metal recovery device of the fourth aspect, by depressurizing the inside of the chamber, the pouch becomes more likely to expand. Thereby, the supply of the dissolution solution into the pouch can be promoted.

[0023] According to the metal recovery device of the fifth aspect, by replacing the pouch unit, the target metal can be effectively recovered from the dissolution solution.

[0024] According to the metal recovery device of the seventh aspect, it is possible to prevent liquid leakage when attaching and detaching the inflow port and the outflow port.

[0025] According to the metal recovery device of the ninth aspect, by circulating the dissolution solution through the pouch unit, the adsorption efficiency can be increased.

Brief Description of the Drawings

[0026] [Figure 1] It is a schematic diagram showing the metal recovery device according to the embodiment. [Figure 2] It is a block diagram showing the electrical connection between the control unit and the controlled object. [Figure 3] It is a diagram showing the flow of the metal recovery method according to the embodiment. [Figure 4] It is a schematic diagram showing the metal recovery device in the liquid supply step. [Figure 5] It is a schematic diagram showing the metal recovery device in the circulation step. [Figure 6] It is a schematic diagram showing the metal recovery device in the liquid discharge step. [Figure 7] It is a schematic diagram showing the metal recovery device in the recovery step. [Modes for carrying out the invention]

[0027] Embodiments of the present invention will be described below with reference to the attached drawings. Note that in the drawings, the dimensions and number of parts may be exaggerated or simplified for ease of understanding.

[0028] <1. First Embodiment> Figure 1 is a schematic diagram showing a metal recovery device 1 according to an embodiment. The metal recovery device 1 is a device that recovers target metals such as rare metals and precious metals from electrical and electronic equipment waste called e-waste, lithium-ion batteries, fuel cells (battery waste), industrial waste liquids, etc. Specifically, rare metals include indium, gallium, chromium, germanium, cobalt, zirconium, strontium, cesium, cerium, tungsten, tantalum, titanium, niobium, nickel, vanadium, palladium, platinum, or manganese. Specifically, precious metals include gold, silver, palladium, platinum, iridium, or rhodium. The metal recovery device 1 includes a chamber 2, a pouch unit 10, a liquid delivery unit 30, a pressure adjustment unit 50, and a control unit 60.

[0029] Chamber 2 is a rigid housing capable of housing the pouch unit 10 inside. Chamber 2 has an opening / closing door 21. The opening / closing door 21 is a door for opening and closing an opening 23 provided on the front of Chamber 2. When the opening / closing door 21 is closed, the inside of Chamber 2 is sealed, and when the opening / closing door 21 is opened, the pouch unit 10 can be inserted and removed through the opening 23.

[0030] The pouch unit 10 is a unit for adsorbing the target metal dissolved in the dissolving solution. The pouch unit 10 includes a pouch 11, a carrier 12, an inlet port 13, an outlet port 14, an inlet pipe 15, and an outlet pipe 16.

[0031] Pouch 11 is a flexible bag with an internal seal. Pouch 11 is made of a material resistant to the solvent of the dissolving solution, such as a resin like polyethylene. Pouch 11 is roughly rectangular in shape. However, the shape of pouch 11 is not limited to rectangular and can be arbitrarily set.

[0032] The carrier 12 is housed inside the pouch 11. The carrier 12 is a component to which powder capable of adsorbing the target metal is pre-attached. The powder attached to the carrier 12 is a microorganism or a component derived from a microorganism. For example, if the target metal is gold, the microorganism can be yeast, baker's yeast, Torula yeast, Cupriavidus metallidurans, Chromobacterium, or Chromobacterium violaceum. Among the microorganisms, commercially available baker's yeast (dried cells) and Torula yeast (dried cells) are inexpensive and readily available in large quantities, thus keeping the cost of the adsorbent low. Furthermore, metal recovery after adsorption can be carried out by relatively easy methods such as roasting the microorganism or its components containing the target metal. Moreover, because this is a biological metal separation and recovery method, it does not use petroleum-derived separation agents (e.g., ion exchange resins, solvent extractants, etc.), thus significantly reducing the environmental burden. However, the powder is not limited to microorganisms or components derived from microorganisms. In other words, inorganic or organic materials can be used as the powder, and specifically, metal-organic frameworks (MOFs) or noria derivatives can be used.

[0033] The carrier 12 can be made of a water-permeable or water-permeable material such as filter paper, membrane, or film, with cellulose as the main material. The carrier 12 is preferably in sheet form, but may also be in block form, etc. The powder is attached to the surface of the carrier 12, for example, via an adhesive. It is not essential that the powder is attached to the surface of the carrier 12; it may also be attached to the inside of the carrier 12.

[0034] The inlet port 13 is a port for allowing the dissolving solution to flow into the pouch 11. The outlet port 14 is a port for allowing the dissolving solution to flow out of the pouch 11. The inlet port 13 is flow-connected to the second liquid supply pipe 33 of the liquid supply unit 30. The outlet port 14 is flow-connected to the second drain pipe 43 of the liquid supply unit 30.

[0035] The inlet pipe 15 is connected to the inlet port 13. The inlet pipe 15 is inserted into the pouch 11 and is a tube for injecting the dissolving solution into the pouch 11 from the outside. The inlet pipe 15 is inserted into the pouch 11 from one end of the top of the pouch 11. The inlet pipe 15 has a plurality of discharge ports 151. The plurality of discharge ports 151 are bent at a 90-degree angle inside the pouch 11 and have a parallel portion 153 that extends parallel to the top edge of the pouch 11. The plurality of discharge ports 151 are provided in the parallel portion 153 of the inlet pipe 15 that extends parallel to its top edge. The plurality of discharge ports 151 are arranged at equal intervals along the parallel portion 153 of the inlet pipe 15. The plurality of discharge ports 151 discharge the dissolving solution into the pouch 11 from a position above the carrier 12. Note that there may be only one discharge port 151. The discharge port 151 may be an elongated slit-shaped hole.

[0036] Multiple discharge ports 151 are arranged in a dispersed manner along the width direction of the carrier 12. Therefore, the dissolving solution can be dispersed and discharged throughout the entire carrier 12 in the width direction. This allows for increased adsorption efficiency of the target metal.

[0037] The outflow tube 16 is connected to the outflow port 14. The outflow tube 16 is inserted into the pouch 11 and is a tube for sucking out the dissolved liquid stored in the pouch 11. The outflow tube 16 is inserted into the pouch 11 from the other end of the top of the pouch 11. The outflow tube 16 extends along the side of the pouch 11 from the top to the bottom of the pouch 11. The outlet 161 of the outflow tube 16 is located in the lower part of the pouch 11.

[0038] The inlet port 13 and outlet port 14 are equipped with check valves (not shown). The check valve at the inlet port 13 allows fluid to flow from the second liquid supply pipe 33 to the inlet pipe 15 and blocks the flow in the reverse direction. Similarly, the check valve at the outlet port 14 allows fluid to flow from the outlet pipe 16 to the second drain pipe 43 and blocks the flow in the reverse direction. The presence of check valves at the inlet port 13 and outlet port 14 prevents liquid leakage when attaching or detaching the pouch unit 10.

[0039] The liquid supply unit 30 is a unit that supplies a solution containing the target metal into the pouch 11 of the pouch unit 10. The liquid supply unit 30 also has a discharge function for discharging the solution from the pouch 11 of the pouch unit 10. The liquid supply unit 30 includes a liquid supply tank 31, a first liquid supply pipe 32, a second liquid supply pipe 33, an on / off valve 34, a liquid supply pump 35, a first switching valve 36, and a second switching valve 37. The liquid supply unit 30 also includes a drain tank 41, a first drain pipe 42, a second drain pipe 43, and an on / off valve 44.

[0040] The liquid supply tank 31 is a container for storing the dissolving solution. The first liquid supply pipe 32 connects the liquid supply tank 31 and the first switching valve 36 via a flow path. The on / off valve 34 is provided in the first liquid supply pipe 32 and opens or closes the fluid flow within the first liquid supply pipe 32.

[0041] The second liquid supply pipe 33 penetrates the top of the chamber 2 and extends into the interior of the chamber 2. The second liquid supply pipe 33 connects the second switching valve 37 and the pouch unit 10 via a flow path. One end of the second liquid supply pipe 33 is detachably connected to the inlet port 13 of the pouch unit 10. The liquid transfer pump 35 is connected to the first switching valve 36 and the second switching valve 37, and pumps liquid from the first switching valve 36 side to the second switching valve 37 side.

[0042] The first switching valve 36 and the second switching valve 37 are valves capable of switching the fluid flow in two directions. The first switching valve 36 and the second switching valve 37 each have three connection ports. The three connection ports of the first switching valve 36 are connected to the first liquid supply pipe 32, the liquid transfer pump 35, and the second drain pipe 43, respectively. The three connection ports of the second switching valve 37 are connected to the second liquid supply pipe 33, the liquid transfer pump 35, and the first drain pipe 42, respectively.

[0043] The drain tank 41 is a container for storing drainage. The first drain pipe 42 connects the second switching valve 37 and the drain tank 41 via a flow path. The on / off valve 44 is provided in the first drain pipe 42 and opens or closes the fluid flow within the first drain pipe 42.

[0044] The second drain pipe 43 penetrates the top of the chamber 2 and extends into the interior of the chamber 2. The second drain pipe 43 connects the first switching valve 36 and the outlet port 14 of the pouch unit 10 via a flow path. One end of the second drain pipe 43 is detachably connected to the outlet port 14 of the pouch unit 10.

[0045] The pressure adjustment unit 50 is a unit that adjusts the pressure inside the chamber 2. The pressure adjustment unit 50 includes an air pipe 51, an on / off valve 52, and a pressure / depressurization pump 53. The air pipe 51 is attached to the side of the chamber 2 and is connected to the chamber 2 via a flow path. One end of the air pipe 51 is open to the atmosphere. The on / off valve 52 is provided on the air pipe 51 and can shut off or open the fluid flow inside the air pipe 51. The pressure / depressurization pump 53 is provided on the air pipe 51. The pressure / depressurization pump 53 supplies air into the chamber 2 via the air pipe 51 and pressurizes the inside of the chamber 2 to a positive pressure state greater than atmospheric pressure. The pressure / depressurization pump 53 also discharges air from inside the chamber 2 via the air pipe 51 and depressurizes the inside of the chamber 2. The pressure / depressurization pump 53 may consist of a pressurizing pump and a depressurizing pump (vacuum pump).

[0046] Figure 2 is a block diagram showing the electrical connection between the control unit 60 and the controlled object. The control unit 60 is a computer equipped with a processor 61 such as a CPU and a memory 63 which is a main memory such as RAM. The memory 63 may be composed of an auxiliary storage device such as a hard disk drive. The memory 63 stores a program P that the computer can execute. The processor 61 controls the controlled object of the metal recovery device 1 by operating according to the procedures specified in the program P.

[0047] As shown in Figure 2, the control unit 60 is electrically connected to the control targets: the on / off valves 34, 44, 52, the liquid transfer pump 35, the first switching valve 36, the second switching valve 37, and the pressure / vacuum pump 53.

[0048] Figure 3 is a diagram showing the flow of the metal recovery method according to the embodiment. The metal recovery method includes, in order, a liquid supply process S1, a circulation process S2, a drainage process S3, and a recovery process S4. Each of these processes will be explained with reference to Figures 4 to 7. In the following explanation, it is assumed that the pouch unit 10 is set in the chamber 2 of the metal recovery device 1 in advance. That is, with the pouch unit 10 positioned in the chamber 2, the inlet port 13 of the pouch unit 10 is connected to the second liquid supply pipe 33, and the outlet port 14 is connected to the second drainage pipe 43.

[0049] Figure 4 is a schematic diagram showing the metal recovery device 1 in the liquid supply process S1. The liquid supply process S1 is the process of supplying the dissolving solution into the pouch 11 of the pouch unit 10 housed in the chamber 2. In the liquid supply process S1, the control unit 60 opens the on / off valve 34 and closes the on / off valve 44. The control unit 60 connects the first liquid supply pipe 32 to the liquid supply pump 35 using the first switching valve 36, and connects the liquid supply pump 35 to the second liquid supply pipe 33 using the second switching valve 37. In this state, the control unit 60 drives the liquid supply pump 35. As a result, the dissolving solution stored in the liquid supply tank 31 moves into the pouch 11 through the first liquid supply pipe 32, the second liquid supply pipe 33, the inlet port 13 and inlet pipe 15 of the pouch unit 10. In this way, the dissolving solution is supplied into the pouch 11.

[0050] In the liquid supply process S1, the control unit 60 opens the on / off valve 52 and drives the pressure pump 53 to discharge air from inside the chamber 2. This reduces the pressure inside the chamber 2 to a negative pressure state lower than atmospheric pressure. The pressure drop inside the chamber 2 makes it easier for the pouch 11 to inflate, promoting the movement of the dissolving solution into the pouch 11. Once the required amount of dissolving solution has been supplied into the pouch 11 in the liquid supply process S1, the next circulation process S2 is executed.

[0051] The timing for ending the liquid supply process S1 (for example, the timing for stopping the liquid supply pump 35) may be a predetermined value, or it may be determined by the control unit 60 based on the output from a sensor that measures the amount of dissolving solution sent from the liquid supply tank 31 to the pouch unit 10. As such a sensor, a flow sensor provided in the first liquid supply pipe 32 can be used.

[0052] Figure 5 is a schematic diagram showing the metal recovery device 1 in the circulation process S2. The circulation process S2 is a process in which the dissolving solution is circulated within the pouch 11. In the circulation process S2, the control unit 60 closes the on / off valves 34 and 52. The control unit 60 also connects the liquid transfer pump 35 to the first drain pipe 42 using the first switching valve 36, and connects the liquid transfer pump 35 to the second supply pipe 33 using the second switching valve 37. In this state, the control unit 60 drives the liquid transfer pump 35. As a result, the dissolving solution in the pouch 11 is discharged from the pouch 11 through the outflow pipe 16 and returned to the pouch 11 through the second drain pipe 43, the second supply pipe 33, and the inflow pipe 15. In other words, the dissolving solution circulates within the pouch 11. The liquid transfer pump 35, second liquid supply pipe 33, first switching valve 36, second switching valve 37, and second drain pipe 43 are an example of a circulation unit.

[0053] In the circulation process S2, the dissolving solution is circulated within the pouch 11, allowing for effective agitation. This enables efficient adsorption of the target metal in the dissolving solution onto the powder of the carrier 12. In the circulation process S2, as shown in Figure 5, each discharge port 151 of the inlet pipe 15 is exposed above the liquid surface of the dissolving solution in the pouch 11. This allows for agitation of the dissolving solution, thereby increasing the adsorption efficiency. After the circulation process S2, the control unit 60 executes the draining process S3.

[0054] Figure 6 is a schematic diagram showing the metal recovery device 1 in the drainage process S3. Drainage process S3 is the process of discharging the dissolved liquid from the pouch 11. In drainage process S3, the control unit 60 opens the on / off valve 44. The control unit 60 also connects the liquid transfer pump 35 and the first drainage pipe 42 using the second switching valve 37. In this state, the control unit 60 drives the liquid transfer pump 35. As a result, the dissolved liquid from the pouch 11 is drawn out by the outflow pipe 16 and sent to the drainage tank 41 through the first drainage pipe 42. As a result, the dissolved liquid is discharged into the pouch 11.

[0055] In the drainage process S3, the control unit 60 opens the on / off valve 52 and drives the pressure pump 53 to send air into the chamber 2. This pressurizes the chamber 2. The pressurization in the chamber 2 makes the pouch 11 more likely to deflate, further promoting the discharge of the dissolved liquid from the pouch 11. After the drainage process S3 is completed, the recovery process S4 is executed.

[0056] The timing for ending the drainage process S3 (for example, the timing for stopping the liquid transfer pump 35) may be a predetermined value, or it may be determined by the control unit 60 based on the output from a sensor that measures the amount of dissolved liquid sent from the pouch unit 10 to the drainage tank 41. As such a sensor, a flow sensor provided in the first drainage pipe 42 can be used.

[0057] Furthermore, in the drainage process S3, after the dissolution liquid in the pouch 11 has been drained, the pressure adjustment unit 50 may repeatedly depressurize and pressurize the chamber 2, thereby repeatedly expanding and contracting the pouch 11. This allows for further drainage of the dissolution liquid in the pouch 11, thereby promoting dewatering of the carrier 12. In addition, a mechanism for supplying air into the pouch 11 may be provided to expand the pouch 11. For example, a valve for venting to the atmosphere may be provided in the second drainage pipe 43 or the second supply pipe 33, and the control unit 60 can open the valve to supply air into the pouch 11. Alternatively, a separate pump may be provided to supply air into the pouch 11.

[0058] Figure 7 is a schematic diagram showing the recovery process S4. In the recovery process S4, the control unit 60 closes the on / off valves 34 and 44, and stops the liquid transfer pump 35. In this state, the user opens the on / off door 21 and disconnects the inlet port 13 and outlet port 14 from the second liquid supply pipe 33 and the second liquid drain pipe 43. This allows the user to remove the pouch unit 10 from inside the chamber 2.

[0059] As described above, with the metal recovery device 1, pouch unit 10, and the metal recovery method described above, the target metal can be adsorbed onto the carrier 12 by supplying a dissolving solution containing the target metal into the pouch unit 10. Therefore, the target metal can be recovered efficiently.

[0060] Furthermore, by circulating the dissolving solution within pouch 11, the adsorption efficiency can be increased, thereby shortening the time required to recover the target metal.

[0061] Furthermore, discharging the dissolving solution from the pouch 11 facilitates the dewatering of the carrier 12. In particular, pressurizing the chamber 2 during discharge makes the pouch 11 more likely to deflate. This promotes the dewatering of the carrier 12.

[0062] The pouch unit 10 can be attached to and replaced with the liquid delivery unit 30. Therefore, by replacing the pouch unit 10, the target metal can be effectively recovered from the dissolving solution.

[0063] <2. Variant Example> Although embodiments have been described above, the present invention is not limited to those described above, and various modifications are possible.

[0064] For example, the chamber 2 may be provided with a valve that releases the vacuum inside the chamber 2. The control unit 60 may reduce the pressure by opening the valve.

[0065] Furthermore, a pressing mechanism for deflating the pouch 11 may be provided. The pressing mechanism may be one which compresses the pouch 11 with rollers.

[0066] Furthermore, the liquid delivery unit 30 may have multiple lines to connect to multiple pouch units 10. In this case, by supplying the dissolving solution to the pouch units 10 simultaneously, the adsorption of the target metal in the dissolving solution can be efficiently carried out.

[0067] Although not shown in the diagram, the metal recovery device 1 may also include an extraction device that extracts the target metal from an object containing the target metal (such as e-waste) using a chemical solution. The chemical solution (dissolving solution) containing the target metal sent from the extraction device may be stored in the supply tank 31.

[0068] Although this invention has been described in detail, the above description is illustrative in all respects, and the invention is not limited thereto. It is understood that countless variations not illustrated can be conceived without falling outside the scope of this invention. The components described in each of the above embodiments and variations can be combined or omitted as appropriate, as long as they do not contradict each other. [Explanation of symbols]

[0069] 1: Metal recovery device 2: Chamber 10: Pouch Unit 11: Pouch 12: Carrier 13: Inflow Port 14: Leakage Port 15:Inflow pipe 30: Liquid delivery unit 50: Pressure adjustment unit 151:Discharge port

Claims

1. A metal recovery device for recovering target metals, A pouch unit comprising a carrier to which a powder capable of adsorbing a target metal is pre-attached, and a pouch containing the carrier, A liquid delivery unit that supplies the dissolution solution containing the target metal into the pouch, A metal recovery device equipped with the following features.

2. A metal recovery device according to claim 1, The liquid delivery unit is a metal recovery device that discharges the dissolving solution from inside the pouch.

3. A metal recovery device according to claim 2, A chamber capable of housing the pouch unit inside, A pressure adjustment unit that pressurizes the inside of the chamber, A metal recovery device that also includes additional features.

4. A metal recovery device according to claim 3, The pressure adjustment unit is a metal recovery device that reduces the pressure inside the chamber.

5. A metal recovery device according to claim 1, A metal recovery device in which the pouch unit is detachably replaceable with respect to the liquid delivery unit.

6. A metal recovery device according to claim 5, The metal recovery device comprises a pouch unit having an inlet port for introducing the dissolving solution into the pouch and an outlet port for releasing the dissolving solution from inside the pouch.

7. A metal recovery device according to claim 6, The metal recovery device has check valves at its inlet port and outlet port, respectively.

8. A metal recovery device according to claim 6, The pouch unit further includes an inlet pipe extending from the inlet port and inserted into the pouch, The metal recovery device has an inlet pipe above the carrier and a discharge port for discharging the dissolving liquid into the pouch.

9. A metal recovery device according to claim 1, The liquid delivery unit is a metal recovery device having a circulation unit that discharges the dissolving solution from the pouch and returns the dissolving solution to the pouch.

10. A metal recovery device according to any one of claims 1 to 9, The aforementioned powder is a microorganism or a component derived from a microorganism, and the metal recovery device.

11. A metal recovery method for recovering a target metal, A metal recovery method comprising the step of supplying a dissolved solution containing the target metal into a pouch of a pouch unit containing a carrier to which a powder capable of adsorbing the target metal is pre-attached.

12. It is a pouch unit, A carrier to which a powder capable of adsorbing a target metal is pre-attached, A pouch capable of containing the dissolution solution in which the carrier and the target metal are dissolved, A pouch unit equipped with [a specific feature / feature].

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