Recovery system and recovery method for layered structure bonded by curing glue

Abstract

The invention provides a recovery system and a recovery method for a layered structure bonded by a curing adhesive. The recovery system comprises a barrel groove device, a fused salt supply device and a transfer device. The barrel groove device can accommodate the layered structure. The fused salt supply equipment can inject fused salt prepared according to a unique formula into the barrel groove device and can also be used for discharging the fused salt in the barrel groove device. The transfer device is capable of transferring the layered structure among the outside, the temperature adjustment space and the tub device. Through the structural design of the barrel groove device, the fused salt supply equipment and the transfer equipment, the fused salt can be used for heating and cracking cured viscose in the layered structure, the layered object with a complete structure is obtained, and the defects that the layered structure is recycled through methods such as direct heating and cracking, mechanical stripping or scraping and the like at present can be overcome.

Description

Technical Field

[0001] The present invention relates to a material recycling system and recycling method, and in particular to a recycling system and recycling method for recycling a layered structure bonded by a cured adhesive. Background Art

[0002] In the global wave of renewable energy, solar power generation has become one of the main renewable energy sources used in various countries. However, solar modules have a certain service life. When the solar cell module loses its power generation function, its self-generation system must be dismantled, resulting in an increasing number of discarded solar cell modules. How to recycle these discarded solar cell modules has become an important industry issue.

[0003] Solar modules are generally composed of key components such as the outer frame, glass cover, photovoltaic panels, adhesive materials, backplane, and junction box. Since the warranty period of solar modules is required to be as long as 25 years, the photovoltaic panels will be firmly fixed between the glass cover and the backplane by adhesive materials. Therefore, in the process of recycling solar cell modules, how to completely separate the glass cover, photovoltaic panels and the backplane becomes the biggest challenge. Since the backplane is usually made of fluorine-containing materials, direct incineration is very environmentally unfriendly and is not an acceptable treatment method at this stage.

[0004] At present, the mainstream method for disassembling the glass cover and the back plate of the solar cell module is mechanical peeling or scraping. However, this method is prone to cause the glass cover to break, and in order to deal with the breakage of the glass cover, different improvement methods must be derived. In addition, the aforementioned recycling methods can usually only disassemble and recycle single solar modules one by one, and cannot simultaneously recycle a large number of solar cell modules. Similarly, the recycling of other types of layered structures bonded with cured adhesives will also have the same problem.

[0005] China Patent Publication No. CN115805227A discloses a molten salt recycling device for waste circuit boards, Taiwan Patent Publication No. TW Case M426447U discloses a high-temperature liquid inorganic molten salt rapid extraction module device for metal ions, Taiwan Invention Patent Publication No. TW201028224A discloses a reactor device for cracking circuit boards, and China Utility Model Publication No. CN210305002U discloses a molten salt furnace fume treatment device; the technologies disclosed in these prior patents all immerse the waste to be recycled into a tank body that has been pre-filled with molten salt without preheating, and therefore all have the same disadvantages including: the temperature difference between the waste before and after immersion in the molten salt is too large, resulting in the breakage of the plate-like material to be completely recovered, the waste is shaken and collided due to the buoyancy and surface tension of the molten salt during immersion in the pre-filled molten salt, and the plate-like material to be recycled after cracking is directly taken out from the filled molten salt. The plate-like material is still attached to a lot of molten salt, which directly solidifies on the surface of the plate-like material after cooling, resulting in difficulty in handling, thereby reducing the efficiency and yield of recovering complete plate-like materials, and there is room for further improvement. Summary of the invention

[0006] It is therefore an object of the present invention to provide a system for recycling cured adhesive bonded layer structures which ameliorates at least one of the disadvantages of the prior art.

[0007] Another object of the present invention is to provide a method for recycling layered structures bonded by cured adhesives that can improve at least one disadvantage of the prior art.

[0008] Therefore, the present invention provides a recovery system for a layered structure bonded by a cured adhesive, comprising at least one mounting device, each of which can accommodate a plurality of layered structures; at least one tank body, each of which has a recovery processing space for accommodating the mounting device; a molten salt container for accommodating molten salt; a heating device connected to the molten salt container, which can heat the molten salt contained in the molten salt container; at least one pump body device, connected to the molten salt container and the tank body, which can transport the molten salt contained in the molten salt container into the recovery processing space of the tank body, and pump the molten salt contained in the recovery processing space back to the molten salt container; and a heat preservation device, connected to the tank body, which can heat the molten salt contained in the recovery processing space of the tank body. The invention relates to a device for heating the molten salt contained in the molten salt container; a transfer device capable of transferring the device and the plurality of layered structures contained in the device into or out of the recycling processing space of the tank; and a control device, the signal of which is connected to the heating device, the pump device, the heat preservation device and the transfer device; wherein the control device performs the following control functions: controlling the heating device to heat the molten salt contained in the molten salt container to a molten state; controlling the transfer device to transfer the device and the plurality of layered structures contained in the device into the recycling processing space of the tank when the liquid level of the molten salt in the recycling processing space of the tank is lower than a predetermined low water level; controlling the pump device to transfer the device and the plurality of layered structures contained in the device into the recycling processing space of the tank; and controlling the pump device to transfer the device and the plurality of layered structures contained in the device into the recycling processing space of the tank. , when the apparatus and the plurality of layered structures are already contained in the recycling processing space of the tank body, the pump body device transports the molten salt contained in the molten salt container into the recycling processing space of the tank body until the liquid level of the molten salt contained in the recycling processing space of the tank body reaches a predetermined high water level; the heat preservation device is controlled to heat the molten salt in the recycling processing space of the tank body so that the molten salt in the recycling processing space is maintained at a predetermined heat preservation temperature; when the liquid level of the molten salt transported to the recycling processing space reaches the predetermined high water level, the control device starts timing a predetermined processing time, and controls the pump body device to heat the molten salt contained in the apparatus and the plurality of layered structures after the predetermined processing time ends. In a state where the structure is still located in the recycling and processing space, the molten salt in the recycling and processing space is pumped back to the molten salt container until the liquid level of the molten salt in the recycling and processing space is lower than the predetermined low water level; when the predetermined processing time is over and the liquid level of the molten salt in the recycling and processing space is lower than the predetermined low water level, the control device controls the transfer device to enable the transfer device to move the mounting device together with the plurality of layered structures accommodated in the mounting device out of the recycling and processing space of the tank body; wherein the predetermined low water level is lower than the bottom of the plurality of layered structures accommodated in the mounting device, and the predetermined high water level is higher than the top of the plurality of layered structures accommodated in the mounting device.

[0009] In one embodiment, the recovery system comprises a tank, a molten salt supply device, a transfer device disposed in a chamber device, and a control device. The tank defines a recovery processing space for accommodating the layered structure. The molten salt supply device can be used to inject the molten salt with a unique formula into the tank, and can also be used to discharge the molten salt in the tank. The transfer device can transfer the layered structure between the outside, the temperature adjustment space and the recovery processing space.

[0010] In one embodiment, the molten salt supply device includes a molten salt container containing molten salt in a molten state, and a pump device connected between the recovery and processing space of the tank body and the molten salt container. The pump device includes a delivery pipe. When the liquid level of the molten salt in the recovery and processing space of the tank body is lower than a predetermined low water level, the transfer device delivers the mounting device together with the plurality of layered structures accommodated in the mounting device into the recovery and processing space of the tank body. Afterwards, the delivery pipe of the pump device is controlled to open, and the molten salt in the molten salt container is delivered and injected into the recovery and processing space where the layered structures have been placed, until the liquid level of the molten salt reaches a predetermined high water level, so that the molten salt can heat and crack the solidified adhesive in the layered structure. Then, after a predetermined processing time is reached, the pump device is controlled to pump the molten salt in the recycling and processing space back to the molten salt container while the mounting device and the plurality of layered structures are still located in the recycling and processing space, until the liquid level of the molten salt in the recycling and processing space is lower than the predetermined low water level. Thereafter, the transfer device is controlled to move the mounting device together with the plurality of layered structures contained in the mounting device out of the recycling and processing space of the tank body when the liquid level of the molten salt in the recycling and processing space of the tank body is lower than the predetermined low water level.

[0011] In one embodiment of the recycling system of the present invention, a cavity device and a cooling device are further included. The cavity device includes a cavity and a door unit installed in the cavity. A temperature adjustment space is defined inside the cavity, which can be connected to the recycling and processing space. The door unit can be controlled by the control device to change between a first position that allows the temperature adjustment space to communicate with the outside world and close the recycling and processing space, and a second position that separates the temperature adjustment space from the outside world and connects the temperature adjustment space with the recycling and processing space. The temperature adjustment space has a first temperature adjustment interval that is connected to the outside world, and a second temperature adjustment interval that connects the first temperature adjustment interval with the recycling and processing space. The door unit has a first door body. When the door unit is located at the first position, the first door body will close the second temperature adjustment interval and the recycling and processing space, and the first temperature adjustment interval will be connected to the outside world. When the door unit is located at the second position, the first door body will close the first temperature adjustment interval and the outside world, and the second temperature adjustment interval will be connected to the recycling and processing space.

[0012] In one embodiment, when the control device is activated to have a recycling function, a preheating procedure, a recycling procedure and a cooling procedure are successively executed; when the control device is executing the preheating procedure, the control device controls the transfer device to move the equipment from the outside into the first temperature adjustment zone, then controls the door unit to change to the second position, and after a preliminary preheating time, controls the transfer device to move the equipment into the second temperature adjustment zone and stay there for a high temperature preheating time. When the control device is executing the recycling procedure, the control device controls the transfer device to move the equipment into the recycling processing space. When the control device is executing the cooling procedure, the control device controls the transfer device to move the equipment from the recycling processing space into the second temperature adjustment zone and stay there for a first cooling time, then controls the transfer device to move the equipment into the first temperature adjustment zone and stay there for a second cooling time, then controls the door unit to change to the first position, and controls the transfer device to move the equipment out of the first temperature adjustment zone.

[0013] In one embodiment, the cooling device is disposed in the cavity and is signal-connected to the control device; the cooling device can be controlled by the control device to start up and generate a heat dissipation airflow in the first temperature adjustment zone; when executing the cooling procedure, the control device controls the transfer device to move the device into the first temperature adjustment zone during the second cooling time, and controls to start up the cooling device.

[0014] In one embodiment of the recycling system described in the present invention, it further includes a cavity device and a cooling device; wherein: the cavity device includes a cavity and a door unit installed in the cavity; a temperature-adjusting space is defined inside the cavity, which can be connected to the recycling processing space; the door unit can be controlled by the control device to change between a first position that enables the temperature-adjusting space to communicate with the outside world and close the recycling processing space, and a second position that separates the temperature-adjusting space from the outside world and enables the temperature-adjusting space to communicate with the recycling processing space; the temperature-adjusting space has a first temperature-adjusting interval and a third temperature-adjusting interval that are connected to the outside world, and a second temperature-adjusting interval that is connected between the first temperature-adjusting interval and the second temperature-adjusting interval and connected above the recycling processing space; the door unit The door unit can be controlled to change between the first position, the second position and a third position; when the door unit is located at the first position, the first temperature adjustment interval is connected to the outside world and the recycling processing space is separated from the second temperature adjustment interval, and the third temperature adjustment interval is separated from the outside world; when the door unit is located at the second position, the recycling processing space is connected to the second temperature adjustment interval, and the first temperature adjustment interval is separated from the outside world, and the third temperature adjustment interval is separated from the outside world; when the door unit is located at the third position, the third temperature adjustment interval is connected to the outside world, and the recycling processing space is separated from the second temperature adjustment interval, and the first temperature adjustment interval is separated from the outside world; when the control device is activated with a recycling function, a preheating program will be executed in succession , a recycling process and a cooling process; when the control device executes the preheating process, it controls the transfer device to move the equipment from the outside into the first temperature adjustment zone, then controls the door unit to change to the second position, and after a preliminary preheating time, controls the transfer device to move the equipment into the second temperature adjustment zone and stay there for a high temperature preheating time; when the control device executes the recycling process, it controls the transfer device to move the equipment into the recycling process space; when the control device executes the cooling process, it controls the transfer device to move the equipment from the recycling process space into the second temperature adjustment zone and stay there for a first cooling time, and then controls the transfer device to move the equipment into the third temperature adjustment zone and stay there for a second cooling time, Then, the door unit is controlled to change to the third position, and the transfer device is controlled to move the fixture out of the third temperature adjustment zone; the cooling device is arranged in the cavity and is connected to the control device by signal; the cooling device can be controlled by the control device to start and generate heat dissipation airflow in the third temperature adjustment zone; when executing the cooling program, the control device controls the transfer device to move the fixture into the third temperature adjustment zone during the second cooling time, and controls to start the cooling device; the temperature of the first temperature adjustment zone is maintained between 100 and 200° C., the temperature of the second temperature adjustment zone is maintained between 200 and 350° C., the temperature of the third temperature adjustment zone is lower than 200° C., and the temperature of the molten salt in the tank is maintained at a high temperature of 300 to 550° C. by the heat preservation device.

[0015] In a further embodiment of the recovery system described in the present invention, the control device includes a liquid level sensor arranged in the tank body, and a first temperature sensor arranged in the molten salt container; the liquid level sensor can sense the liquid level of the molten salt in the recovery and processing space; when the molten salt is injected into the recovery and processing space, the control device will stop injecting the molten salt when it is determined that the liquid level measured by the liquid level sensor has reached the predetermined high water level; when the control device controls the pump body device to pump the molten salt in the recovery and processing space back to the molten salt container, it will control the pump body device to stop operating when it is determined that the liquid level measured by the liquid level sensor is lower than the predetermined low water level; the first temperature sensor can sense the temperature of the molten salt in the molten salt container, and when the control device is operated to start the recovery and processing program, when it is determined that the molten salt measured by the first temperature sensor has reached a predetermined melting temperature, it will control the pump body device to start transporting the molten salt contained in the molten salt container into the recovery and processing space of the tank body.

[0016] In a further embodiment of the recovery system of the present invention, the molten salt is a potassium nitrate molten salt with additional pure potassium element added thereto, so that the weight percentage content of potassium in the modulated molten salt is higher than the potassium content in the pure potassium nitrate molten salt; wherein the weight percentage of the additional pure potassium element added to the potassium nitrate molten salt is in the range of 5% to 15% of the weight percentage of the potassium nitrate molten salt, so that the weight proportion of the potassium component in the molten salt is in the range of 41.6% to 46.68%.

[0017] Therefore, the present invention provides a method for recovering layered structures bonded by solidified adhesive, comprising the following steps: a heat treatment medium preparation step, preparing a molten salt with potassium nitrate as the main component, placing the prepared molten salt in a molten salt container, and then using a heating device to heat the molten salt in the molten salt container to a predetermined heat treatment temperature, so that the molten salt becomes a fluid; a preheating step, controlling a transfer device by a control device to move a holder containing a plurality of layered structures into a temperature adjustment space for preheating treatment, thereby reducing the temperature difference between the layered structures and the molten salt; a recycling step; The recycling step further comprises the following steps: a step of placing the layered structure, wherein the control device causes the transfer device to place the placement device together with the layered structure that has completed the preheating treatment into a recycling treatment space of a tank; at this time, the liquid level of the molten salt in the tank is not high enough to soak the bottom of the layered structure; a step of filling molten salt, wherein the control device injects the molten salt that has been heated to the predetermined heat treatment temperature from the molten salt container into the recycling treatment space of the tank until the liquid level of the molten salt has completely submerged the top of the layered structure; and The control device controls a heat preservation device to heat the molten salt in the recycling and processing space of the tank body and maintain it at a predetermined heat preservation temperature; and a molten salt heating and cracking treatment step is performed to immerse the layered structure in the molten salt in the recycling and processing space, so that a viscose in the layered structure contacts the molten salt and stays for a treatment time, so that a plurality of layered objects originally bonded by the viscose in the layered structure are separated to produce a recycling product; a recycling product removal step is performed, after the treatment time is over, the control device controls a pump body device to pump the molten salt in the recycling and processing space back to the molten salt container a device for transferring the molten salt in the recycling processing space until the liquid level of the molten salt in the recycling processing space is lower than the bottom of the layered structure; a cooling step, the control device causes the transfer device to transfer the device together with the recovered product generated after the layered structure is treated with the molten salt from the recycling processing space into the temperature adjustment space for cooling treatment after the treatment time is completed and the liquid level of the molten salt in the recycling processing space is lower than the bottom of the layered structure; and a discharging step, the control device causes the transfer device to transfer the recovered product out of the temperature adjustment space after the recovered product completes the cooling treatment.

[0018] In a further embodiment of the recycling method of the present invention, the temperature control space has a first temperature control interval and a second temperature control interval connected to the recycling processing space and the first temperature control interval; in the preheating step, the transfer device first moves the layered structure into the first temperature control interval and keeps it for a preliminary preheating time, and then the transfer device moves the layered structure into the second temperature control interval and keeps it for a high-temperature preheating time, and then the recycling processing step is continued.

[0019] In a further embodiment of the recovery method of the present invention, in the cooling step, the transfer device is used to move the recovered product into the second temperature adjustment interval and keep it there for a first cooling time, and then the transfer device is controlled to move the recovered product into the first temperature adjustment interval and keep it there for a second cooling time, and during the second cooling time, a cooling device is controlled to generate a heat dissipation airflow flowing through the recovered product in the first temperature adjustment interval, and then the discharging step is performed.

[0020] In a further embodiment of the recovery method of the present invention, the temperature control space also has a third temperature control interval; the second temperature control interval is connected between the first temperature control interval, the third temperature control interval and the recovery processing space; in the cooling step, the transfer device moves the recovered product into the second temperature control interval and stays for a first cooling time, and then controls the transfer device to move the recovered product into the third temperature control interval and stays for a second cooling time, and controls a cooling device to generate a heat dissipation airflow flowing through the recovered product in the third temperature control interval during the second cooling time, and then performs the discharging step; wherein, the temperature of the first temperature control interval is maintained between 100 and 200°C, the temperature of the second temperature control interval is maintained between 200 and 350°C, the temperature of the third temperature control interval is lower than 200°C, and the temperature of the molten salt in the tank body is maintained at a high temperature of 300 to 550°C by the insulation device.

[0021] In yet a further embodiment of the recovery method of the present invention, the formula of the molten salt is to add additional pure potassium element to a potassium nitrate molten salt, so that the weight percentage of potassium in the modulated molten salt is higher than the potassium content in the pure potassium nitrate molten salt; wherein the weight percentage of the additional pure potassium element added to the potassium nitrate molten salt is in the range of 5% to 15% of the weight percentage of the potassium nitrate molten salt, so that the weight proportion of the potassium component in the molten salt is in the range of 41.6% to 46.68%, thereby accelerating the timeliness of cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, in which:

[0023] Figure 1 is a side sectional view of a first embodiment, illustrating the structure of a first embodiment of the system for recovering a layered structure bonded by a cured adhesive according to the present invention;

[0024] Figure 2 is a fragmentary side cross-sectional view schematically illustrating the structure of the layered structure to be recycled and processed in the first embodiment;

[0025] Figure 3 is an incomplete three-dimensional diagram illustrating the structure of a mounting device of the first embodiment;

[0026] Figure 4 is a step flow chart illustrating a process of a method for recovering a cured adhesive bonded layered structure according to a second embodiment;

[0027] Figure 5 is similar Figure 1 A view schematically illustrating the first embodiment of the present invention when the layered structure is recycled using molten salt;

[0028] Figure 6 is a functional block diagram illustrating the functional architecture of the second embodiment;

[0029] Figure 7 is a side sectional view schematically illustrating the structure of the second embodiment of the system for recovering a layered structure bonded with a cured adhesive according to the present invention;

[0030] Figure 8 is similar Figure 7 , illustrating a situation when a door unit changes to a first position and a piece of equipment is moved to a first temperature adjustment zone;

[0031] Fig. 9 is similar Figure 7 , illustrating a situation when the mounting device is moved into the first temperature adjustment zone and the door unit changes to the second position;

[0032] Fig.10 is similar Figure 7 A view illustrating the situation when the device is transferred to the second temperature adjustment zone;

[0033] Fig.11 is similar Figure 7 , illustrating the situation when the device is moved into the recycling processing space and the layered structure carried by the device contacts the molten salt;

[0034] Fig.12 is similar Figure 7 , illustrating the situation when the device containing the layered objects produced by the layered structure after processing is moved upward out of the recycling processing space;

[0035] Fig.13 is similar Figure 7 , illustrating a situation when the device is moved to the third temperature adjustment zone and a cooling device is driven to generate heat dissipation airflow;

[0036] Fig.14 is similar Figure 7 , illustrating a situation when the door unit is driven to change to the third position and the third temperature adjustment zone is connected to the outside;

[0037] Fig.15 is similar Figure 7A view illustrating a situation when the device is moved out of the third temperature adjustment zone;

[0038] Fig.16 is a side sectional view schematically illustrating the structure of a third embodiment of the system for recovering a cured adhesive bonded layered structure of the present invention; and

[0039] Fig.17 1 is a schematic structural diagram of a fourth embodiment of a system for recovering layered structures bonded by cured adhesive according to the present invention.

[0040] Description of the accompanying figures: 200-recovery system; 2-cavity equipment; 21-cavity; 211-temperature adjustment space; 212, 213, 214-temperature adjustment interval; 22-door unit; 221, 222-door; 225, 226, 227, 228-gate; 223-driver; 241-feeding area; 242-preheating area; 243-recovery tank area; 244-cooling area; 245-discharging area; 3-barrel tank device; 31-tank; 310-recovery processing space; 32-cover; 4-transfer equipment; 40-track unit; 41-mounting device; 410-separation interval ; 411-rod; 42-transfer device; 5-molten salt supply equipment; 51-molten salt container; 52-conveying pipe; 53-pump body equipment; 61-heating device; 62-insulating device; 69-cooling device; 690-heat dissipation airflow; 7-control device; 71, 73-temperature sensor; 72-liquid level sensor; 74-controller; 81~85, 811, 812, 831~834-steps; 900-layered structure; 901-layered object; 901a-glass cover; 901b-photovoltaic panel; 901c-back panel; 902-adhesive; 910-molten salt. DETAILED DESCRIPTION

[0041] See also Figure 1 , Figure 2 , Figure 5 A first embodiment of the recycling system 200 for a layered structure 900 bonded with a solidified adhesive is suitable for using a molten salt 910 to heat and crack the solidified adhesive 902 in the layered structure 900, so as to separate the bonded layered objects 901. In this embodiment, the layered structure 900 is a solar cell module composed of a layered object 901 (including a glass cover plate 901a, a photovoltaic panel 901b and a back plate 901c) bonded and fixed by an adhesive 902 such as EVA (ethylene-vinyl acetate copolymer), PVB (polyvinyl butyral) or TPU (thermoplastic polyurethane).

[0042] The recovery system 200 includes a chamber device 2, two barrel tank devices 3, a molten salt supply device 5 connected to the barrel tank devices 3 and containing salts that are heated to become molten salt 910, a heating device 61 arranged on the molten salt supply device 5, two transfer devices 4 for moving the layered structure 900 in and out of the barrel tank devices 3, two insulation devices 62 respectively arranged on the barrel tank devices 3, and a control device 7 that signals connect the barrel tank devices 3, the molten salt supply device 5, the heating device 61, the insulation devices 62 and the transfer devices 4.

[0043] Each of the tank devices 3 includes a tank body 31 having a recycling processing space 310 with an opening facing upward, and a cover body 32 (hereinafter also referred to as a door body) installed on the top side of the tank body 31 and covering the recycling processing space 310. The tank body 31 can contain the molten salt 910 in the recycling processing space 310. The cover body 32 can be controlled by the control device 7 to open and close.

[0044] See also Figure 1 , Figure 3 , Figure 5 , the plurality of transfer devices 4 are respectively installed above the barrel tank devices 3. Each of the transfer devices 4 includes a transfer device 42 installed above the corresponding barrel tank device 3, and a mounting device 41 installed on the transfer device 42 and used to carry the layered structure 900. Each of the transfer devices 42 can be controlled to send the corresponding mounting device 41 downward into the recycling processing space 310 of the corresponding tank body 31, and to move the mounting device 41 upward out of the recycling processing space 310 and keep the mounting device 41 at a position of a temperature control space 211.

[0045] In this embodiment, the transfer device 42 is a hanging device, but in other embodiments of the present invention, it can also be a track-type transfer device. Since the transfer device 42 is a prior art and has many types, it will not be described in detail, and is not limited to the above-mentioned embodiments.

[0046] The mounting device 41 is an open frame formed by connecting a plurality of rods 411, and has a plurality of partitions 410 for partitioning and accommodating the layered structure 900. The mounting device 41 can be moved into the recycling space 310 by the transfer device 42, and the layered structure 900 carried and accommodated therein can be moved into the recycling space 310.

[0047] The molten salt supply device 5 includes a molten salt container 51 containing salts that can be heated into a molten state, and two pump devices 53 connected between the molten salt container 51 and the tanks 31. The pump device 53 includes two delivery pipes 52 connected between the molten salt container 51 and the tanks 31 and having a valve function. The molten salt container 51 can be heated by the heating device 61 to heat the contained salts and heat-melt them into the molten salt 910. The melting point of the salt constituting the molten salt 910 is between 200 and 550°C, such as but not limited to sodium nitrate and potassium nitrate.

[0048] Each of the delivery pipes 52 of the pump body device 53 is connected to the bottom of the internal space of the molten salt container 51 at one end, and is connected to the top of the corresponding recovery processing space 310 of the tank body 31 at the other end. Each of the delivery pipes 52 can be controlled to open by the control device 7 to deliver the molten salt 910 in the molten salt container 51 into the corresponding recovery processing space 310 of the tank body 31.

[0049] Each of the pump devices 53 is connected to the bottom of the recycling space 310 of the corresponding tank body 31 and can be controlled to start and pump the molten salt 910 in the recycling space 310 to the molten salt container 51 .

[0050] The heating device 61 is arranged on the molten salt container 51, and can be powered on to generate heat to heat the molten salt container 51, so that the salt in the molten salt container 51 melts into the molten salt 910, and maintains it at a predetermined melting temperature. The heat preservation devices 62 are respectively arranged on the tank bodies 31, and each of the heat preservation devices 62 is an electric heating device that can be powered on to generate heat, and heats the molten salt 910 in the corresponding tank body 31 and maintains it at a predetermined insulation temperature. However, in other embodiments of the present invention, the heating device 61 and the heat preservation devices 62 can also be other types of heaters, such as but not limited to direct-fired heaters, or solar thermal collectors that use sunlight to collect heat.

[0051] The control device 7 includes a first temperature sensor 71 disposed in the molten salt container 51, two liquid level sensors 72 respectively disposed in the tanks 31, two second temperature sensors 73 respectively disposed in the tanks 31, and a controller 74 that signals the first temperature sensor 71, the liquid level sensors 72, and the second temperature sensors 73. The first temperature sensor 71 can be used to sense the temperature of the molten salt 910 in the molten salt container 51. Each liquid level sensor 72 can be used to sense the liquid level of the molten salt 910 in the corresponding recycling space 310. Each second temperature sensor 73 can be used to sense the temperature of the molten salt 910 in the corresponding recycling space 310.

[0052] In this embodiment, the first temperature sensor 71 and the second temperature sensors 73 are both infrared temperature sensors, but other types of temperature sensors may be used in practice, such as but not limited to thermocouples. The liquid level sensors 72 are optical liquid level sensors, but other types of liquid level sensors may be used in practice, such as but not limited to float type liquid level sensors, electrical liquid level sensors that sense impedance changes, acoustic wave type liquid level sensors, and radar wave type liquid level sensors.

[0053] The controller 74 also signals the covers 32 , the heating device 61 , the heat-insulating devices 62 , the delivery pipes 52 and the pump equipment 53 , and can be used to control the operation of the covers 32 , the transfer device 42 , the heating device 61 , the heat-insulating devices 62 , the delivery pipes 52 and the pump equipment 53 .

[0054] The controller 74 has a built-in recycling program. When the recycling program is activated, the controller 74 controls the transfer devices 42 to transfer the holders 41 containing the plurality of layered structures 900 and place them in the recycling spaces 310, and controls the heating device 61 to heat the molten salt 910 in the molten salt container 51 to the predetermined melting temperature. When the transfer device 42 places the holder 41 in the recycling space 310, the recycling space 310 is still empty and has not yet been filled with molten salt 910, or only a small amount of molten salt 910 that has not been completely discharged remains in the recycling space 310, and the liquid level is not high enough to soak the bottom of the layered structure 900. When the controller 74 determines that the temperature of the molten salt 910 measured by the first temperature sensor 71 has reached the predetermined melting temperature, the controller 74 controls the delivery pipes 52 of the pump device 53 to connect the molten salt container 51 and the tanks 31, and starts to inject the molten salt 910 into the recycling processing space 310 where the mounting device 41 and the layered structure 900 have been placed. The controller 74 analyzes the liquid level measured by each liquid level sensor 72, and when it is determined that the liquid level has reached a predetermined high water level, controls the delivery pipe 52 of the corresponding pump device 53 to close, and controls the cover 32 of the corresponding tank device 3 to close to cover the recycling processing space 310, so as to reduce heat dissipation, and starts to count a predetermined processing time. The predetermined processing time is, for example, but not limited to, 10 minutes, 20 minutes or 1 hour.

[0055] When the controller 74 starts timing the predetermined processing time, the temperature sensors 73 respectively sense the temperatures of the molten salt 910 in the tanks 31, and respectively control the operation of the insulation devices 62, so that the insulation devices 62 respectively heat the molten salt 910 in the tanks 31 to maintain the molten salt 910 at the predetermined insulation temperature.

[0056] After the predetermined processing time of each tank body 31 is over, the controller 74 controls the activation of the pump devices 53 to pump the molten salt 910 in the recycling processing space 310 back to the molten salt container 51; at this time, the mounting device 41 and the layered structure 900 are still located in the tank body 31. When it is determined that the liquid level measured by the liquid level sensors 72 drops to a predetermined low water level, the controller 74 controls the closure of the pump devices 53, the opening of the covers 32, and the transfer devices 42 to move the mounting devices 41 together with the layered structure 900 out of the recycling processing space 310, thereby completing the recycling processing procedure.

[0057] In this embodiment, two tank devices 3 and two transfer devices 4 are used as an example for explanation, but the implementation is not limited to this number. The number of the tank devices 3 and the transfer devices 4 can be increased or decreased according to demand, and the minimum number is one.

[0058] In the other embodiments described below, since the structures, connection relationships and functions of the components included in the recycling system 200 are mostly the same or similar to those of the first embodiment, in the following description and drawings, the components with the same structures and functions will be directly given the same component names and numbers and their details will not be repeated.

[0059] Please refer to 4. Figure 6 , Figure 7 The second embodiment of the recovery system 200 for the layered structure 900 bonded with solidified adhesive is suitable for utilizing the fluid molten salt 910 to heat and crack the solidified adhesive in the layered structure 900 so that each bonded layered object 901 (such as Fig.15 shown) separation.

[0060] The second embodiment of the recovery system 200 includes a chamber device 2, a barrel tank device including at least one tank body 31, a molten salt supply device 5 connected to the barrel tank devices 3 and containing salts that are heated to become molten salt 910, a heating device 61 arranged on the molten salt supply device 5, at least one heat preservation device 62 installed on the chamber device 2 and in contact with the tank body 31, a cooling device 69, at least one transfer device 4, and a control device 7. The control device 7 is signal-connected to the chamber device 2, the barrel tank device, the molten salt supply device 5, the heating device 61, the heat preservation device 62, the cooling device 69 and the transfer device 4. The molten salt supply device 5 includes: a molten salt container 51 and a pump body device 53 (including a delivery pipe 52). The control device 7 includes a first temperature sensor 71, a liquid level sensor 72, a second temperature sensor 73, and a controller 74. Since the structures, connection relationships and functions of the above-mentioned elements of the second embodiment of the recycling system 200 are the same as those of the first embodiment, the details thereof will not be repeated.

[0061] The chamber device 2 includes a chamber 21 and a door unit 22 installed in the chamber 21. The chamber 21 defines a temperature adjustment space 211 connected up and down, and a recovery and processing space 310 for the molten salt supply device 5 to inject the molten salt 910. The temperature adjustment space 211 has a first temperature adjustment interval 212, a second temperature adjustment interval 213 and a third temperature adjustment interval 214 arranged horizontally and connected in sequence, and the recovery and processing space 310 is connected below the second temperature adjustment interval 213.

[0062] See also Figure 6 , Figure 7 , Fig.14 The door unit 22 includes a first door 221 and a second door 222 which are arranged at intervals in the cavity 21, and two drivers 223 which are installed in the cavity 21 and are respectively connected to the first door 221 and the second door 222. Each of the drivers 223 can be controlled to change the state of the first door 221 corresponding to the transmission between blocking the first temperature adjustment zone 212 from the outside and blocking the second temperature adjustment zone 213 from the recycling processing space 310, or to change the state of the second door 222 corresponding to the transmission between blocking the third temperature adjustment zone 214 from the outside and blocking the second temperature adjustment zone 213 from the recycling processing space 310, so that the entire door unit 22 can change between a first position, a second position and a third position relative to the cavity 21.

[0063] In the second embodiment, the drivers 223 are telescopic cylinders that can telescopically drive the first door body 221 and the second door body 222 to move relative to the cavity 21. However, in another embodiment of the present invention, the drivers 223 can also be motor transmission devices. Since there are many types of drivers that can be used to control the opening / closing of the door body, the drivers 223 are not limited to the above-mentioned embodiments in implementation.

[0064] When the door unit 22 is in the first position (eg Figure 8 ), the first temperature adjustment zone 212 is connected to the outside, the first door 221 seals and separates the second temperature adjustment zone 213 from the recycling processing space 310, and the second door 222 seals and separates the third temperature adjustment zone 214 from the outside. When the door unit 22 is in the second position (as shown in FIG. Figure 7 ), the first door 221 seals and separates the first temperature adjustment zone 212 from the outside, the second temperature adjustment zone 213 is connected to the recycling processing space 310, and the second door 222 seals and separates the third temperature adjustment zone 214 from the outside. When the door unit 22 is in the third position (as shown in FIG. Fig.14As shown), the first door body 221 seals and separates the first temperature adjustment interval 212 from the outside, the second door body 222 seals and separates the second temperature adjustment interval 213 from the recycling and processing space 310, and the third temperature adjustment interval 214 is connected to the outside. When the door body unit 22 is located in the second position, the heat energy generated by the heat preservation device 62 or / and the heat energy of the molten salt 910 in the recycling and processing space 310 will diffuse upward into the temperature adjustment space 211, so that the ambient temperature of the second temperature adjustment interval 213 will be relatively higher than the ambient temperature of the first temperature adjustment interval 212 and the third temperature adjustment interval 214. In this embodiment, the temperature of the first temperature adjustment interval 212 is maintained between 100 and 200°C, the temperature of the second temperature adjustment interval 213 is maintained between 200 and 350°C, the temperature of the third temperature adjustment interval 214 is lower than 200°C, and the temperature of the molten salt in the tank body 31 is maintained at a high temperature of 300 to 550°C by the heat preservation device 62.

[0065] The heat preservation device 62 can be controlled by the control device 7, and can not only heat and insulate the molten salt 910 contained in the recycling and processing space 310, but also heat the empty tank body 31 (or the tank body 31 only has a little molten salt 910 that has not been completely discharged and the liquid level is not high enough to soak the bottom of the layered structure 900) to achieve the function of increasing and maintaining the temperature of the second temperature adjustment zone 213.

[0066] The cooling device 69 can be controlled by the control device 7 to generate a heat dissipation airflow 690 in the third temperature adjustment zone 214, which can be used to dissipate heat and cool down the items in the third temperature adjustment zone 214. In this embodiment, the cooling device 69 is a fan device, but in another embodiment of the present invention, it can also be an air conditioning device using a refrigerant.

[0067] The transfer device 4 includes a track unit 40 extending transversely in the cavity 21, a transfer device 42 mounted on the track unit 40 and controllably displaced along the track unit 40, and a holder 41 detachably mounted on the transfer device 42 and used to accommodate a plurality of the layered structures 900 to be recycled.

[0068] In this embodiment, the track unit 40 extends transversely across the first temperature adjustment zone 212, the second temperature adjustment zone 213, and the third temperature adjustment zone 214. The transfer device 42 is a hanging device, which can be used to transfer the mounting device 41 up and down, and can be controlled to transfer the mounting device 41 between the zones along the track unit 40. Figure 3 shown.

[0069] In other embodiments of the present invention, the track unit 40 may be designed to extend between the outside and the first temperature adjustment zone 212, between the second temperature adjustment zone 213 and the recycling processing space 310, and between the third temperature adjustment zone 214 and the outside, and the transfer device 42 may be changed into a track-type transfer device, so that the mounting device 41 may be transferred between these zones and spaces along the track unit 40.

[0070] See also Figure 6 , Figure 7 The control device 7 includes a plurality of temperature sensors 71 and 73 for measuring the temperature of the molten salt 910 in the recycling processing space 310, a liquid level sensor 72, and a controller 74 connected to the sensors 71, 72, and 73. The controller 74 has a built-in recycling function. When the recycling function is activated, a medium heating process, a preheating process, a recycling process, and a cooling process are successively executed to recycle the layered structure 900. The processes of the recycling function will be described later.

[0071] See also Figure 4 , Figure 6 , Figure 7 When the recycling system 200 of the present invention is used to recycle the layered structure 900, the mounting device 41 is first placed below the first temperature adjustment zone 212, and the layered structure 900 to be recycled is placed in the mounting device 41, and then the recycling operation can be started. The recycling method of the recycling system 200 for recycling the layered structure 900 includes the following steps:

[0072] Heat treatment medium preparation step 81. First, the formula of the heat treatment medium needs to be modulated (step 811). In the present invention, the heat treatment medium includes a molten salt 910 with potassium nitrate as the main component. In a preferred embodiment, the modulation formula step 811 of the heat treatment medium preparation step 81 is to add additional pure potassium elements to the potassium nitrate molten salt so that the weight percentage content of potassium in the modulated molten salt 910 formula is higher than the potassium content in the pure potassium nitrate molten salt. Because the potassium ions in the potassium element will enhance the replacement reaction of potassium ions and sodium ions with the glass layer in the layered structure 900, the potassium ion concentration in the glass becomes higher, which promotes the hardness of the glass surface layer to become higher. By adding potassium elements to the molten salt with potassium nitrate as the main component, the potassium ion concentration of the modulated molten salt is increased, the glass becomes harder, and it is easier to produce cracks due to temperature differences to facilitate glass shattering or bursting, which can accelerate the timeliness of the cracking process when the recycling process is carried out. In this embodiment, the weight percentage of the additional potassium element added to the molten salt with potassium nitrate as the main component is in the range of 0.1% to 20% of the weight percentage of the potassium nitrate molten salt. However, the best implementation range is to make the weight percentage of the additional potassium element added to the potassium nitrate molten salt reach a range of 5% to 15%. Specifically, the relative molecular mass of potassium nitrate (KNO3) is 101.087, and its component ratio is 38.67% potassium, 13.86% nitrogen, and 47.47% oxygen. By adding 5% to 15% weight percentage of pure potassium element to the potassium nitrate molten salt, the potassium component ratio in the molten salt can be increased to 41.6% to 46.68%, and the aging of the cracking process can be maximized under this best implementation range. In another embodiment, the modulation formula step 811 of the heat treatment medium preparation step 81 is to increase the sodium ion content in the modulated molten salt 910 formula by adding additional sodium nitrate to the molten salt with potassium nitrate as the main component. Since the sodium ions in the sodium nitrate and the sodium ions generated by the glass layer in the layered structure 900 will not produce a replacement reaction, during the cracking process of the recycling process, the glass layer in the layered structure 900 maintains the surface hardness or gently reduces the glass strength in the process of losing the viscosity of the adhesive layer colloid, which is conducive to the peeling of the layers of the recyclable material and maintaining the integrity of the glass layer, backplane and photovoltaic panel after peeling as much as possible. In this embodiment, the weight percentage of the additional sodium nitrate added to the molten salt is 0.1% to 20% of the weight percentage of the molten salt with potassium nitrate as the main component. However, the best implementation range is to make the weight percentage of the additional sodium nitrate added to the molten salt with potassium nitrate as the main component reach the range of 5% to 15%. Under this best implementation range, the integrity of the layered objects such as the glass layer, backplane and photovoltaic panel obtained after peeling can be maximized.

[0073] In other words, when the goal of the recycling method of the present invention is to increase the cracking time of the recycling process as much as possible, the formula modulation step 811 is to add additional pure potassium elements to the potassium nitrate molten salt, so that the weight percentage content of the additional potassium elements in the potassium nitrate molten salt reaches 5% to 15%, thereby increasing the cracking time. Conversely, when the goal of the recycling method is to maintain the integrity of the layered objects such as the glass layer, backplane and photovoltaic panel obtained after peeling as much as possible, the formula modulation step 811 is to add additional sodium nitrate to the potassium nitrate molten salt, so that the weight percentage content of the additional sodium nitrate in the potassium nitrate molten salt reaches 5% to 15%, thereby maintaining the integrity of the layered objects such as the glass layer, backplane and photovoltaic panel obtained after cracking.

[0074] After the molten salt 910 is prepared, the molten salt is placed in a molten salt container, and the controller 74 starts the recovery function, and the medium heating step is started (step 812). The controller 74 controls the door unit 22 to change to the second position, so that the temperature adjustment space 211 and the recovery processing space 310 are completely isolated from the outside, and the recovery processing space 310 is connected to the temperature adjustment space 211. Next, in the heating step 812, the controller 74 controls the operation of the heating device 61 and the heat preservation device 62 according to the temperature of the molten salt 910 measured by the temperature sensors 71 and 73, so that the heating device 61 heats the molten salt 910 in the molten salt container 51 to a predetermined fluid heat treatment temperature, and the heat preservation device 62 heats the tank body 31 (at this time, the tank body 31 is still empty and has not yet been injected with the molten salt 910, or only a little molten salt 910 that has not been completely discharged remains in the tank body 31 and the liquid level is not high enough to soak the bottom of the layered structure 900) to maintain it at the predetermined heat treatment temperature.

[0075] At this time, the heat energy generated by the heat preservation device 62 for heating the tank body 31 and / or the heat energy of the molten salt 910 in the recycling processing space 310 will diffuse upward to the connected temperature adjustment space 211. The ambient temperature of the second temperature adjustment zone 213 connected to the recycling processing space 310 will be the highest, while the ambient temperatures of the first temperature adjustment zone 212 and the third temperature adjustment zone 214 connected to both sides of the second temperature adjustment zone 213 will be relatively lower than the ambient temperature in the second temperature adjustment zone 213.

[0076] See also Figure 4 , Figure 6 , Figure 8 , Fig. 9, preheating step 82. The controller 74 executes the preheating procedure. The controller 74 controls the door unit 22 to change from the second position to the first position, so that the first temperature adjustment zone 212 is connected to the outside. Then, the controller 74 controls the transfer device 42 to suspend the mounting device 41 upward into the first temperature adjustment zone 212, and controls the door unit 22 to change to the second position, thereby closing the first temperature adjustment zone 212 and the outside, and starting to preheat the layered structure 900 carried by the mounting device 41.

[0077] When performing the preheating treatment, the controller 74 first controls the transfer device 42 to drive the mounting device 41 to stay in the first temperature adjustment zone 212 for a preliminary preheating time. During the preliminary preheating time, the thermal energy diffused to the first temperature adjustment zone 212 can be used to perform preliminary preheating treatment on the layered structure 900 in the mounting device 41 to increase the temperature of the layered structure 900. Then, the controller 74 controls the transfer device 42 to transfer the mounting device 41 to the second temperature adjustment zone 213 and keep it for a high-temperature preheating time. During the high-temperature preheating time, the thermal energy in the second temperature adjustment zone 213 with a relatively higher ambient temperature can be used to further increase the temperature of the layered structure 900 and reduce the temperature difference between the layered structure 900 and the molten salt 910.

[0078] See also Figure 4 , Figure 6 , Fig.11 , recycling step 83. After the above-mentioned preheating step 822 is completed, the controller 74 continues to execute the recycling process. The controller 74 controls the transfer device 42 to transfer the mounting device 41 downward into the empty recycling space 310, and then injects the molten salt 910 from the molten salt container 51 into the recycling space 310 located in the tank body 31, so that the layered structure 900 in the mounting device 41 is completely immersed in the molten salt 910, and the mounting device 41 stays in the recycling space 310 for a processing time. Of course, after the molten salt 910 is injected into the recycling space 310, the heat preservation device 62 will continue to heat the fluid molten salt 910 contained in the recycling space 310 to maintain it at the predetermined heat treatment temperature. In this embodiment, the recycling step 83 further includes steps 831 to 834.

[0079] Step 831 of placing the layered structure. The control device 7 controls each of the transfer devices 42 to transfer the corresponding mounting device 41 into the corresponding recycling processing space 310 of the tank body 31. In each of the partitions 410 of the mounting device 41, a layered structure 900 to be recycled is placed. At this time, the tank body 31 is empty and has not yet been filled with molten salt 910, or only a little molten salt 910 that has not been completely drained is left in the tank body 31, and the liquid level is not high enough to soak the bottom of the layered structure 900.

[0080] Filling molten salt step 832. When the controller 74 controls the heating device 61 to heat the molten salt 910 in the molten salt container 51 to the predetermined melting temperature, the conveying pipes 52 of the pump device 53 are controlled to open, and the molten salt 910 is injected into the recycling processing space 310. When the controller 74 determines that the sensing results of the liquid level sensors 72 represent that the molten salt 910 has reached the predetermined high water level, that is, the liquid level of the molten salt 910 has completely submerged the top of the layered structure 900, the conveying pipes 52 of the pump device 53 are controlled to close. The predetermined melting temperature is between 200 and 550°C.

[0081] The reason why the recycling system of the present invention first places the layered structure 900 to be recycled into the empty tank 31 before injecting the molten salt 910 is mainly because, if the tank 31 is filled with liquid molten salt before the layered structure 900 is placed, the holder 41 with the layered structure 900 is very heavy as a whole, and there will be buoyancy tension on the surface of the molten salt when entering the liquid molten salt. When the holder 41 and the bottom of the layered structure 900 just touch the surface of the molten salt and are about to break through the resistance of the buoyancy tension on the surface of the molten salt and enter the liquid molten salt, the gravity of the holder 41 and the layered structure 900 itself and the surface tension and buoyancy of the molten salt disturb each other, causing the holder 41 and the layered structure 900 therein to move up and down or left and right in an undirected manner, which poses a risk in the process, and the holder 41 and the layered structure 900 can only be restored to stability when they are almost completely submerged by the molten salt. Therefore, in order to avoid the aforementioned risk of disturbance and non-directional shaking of the layered structure 900 caused by the surface tension and buoyancy of the molten salt, the recovery system of the present invention is specially equipped with a molten salt container 51, a delivery pipe 52, and a heating device 61 that are independent of the heat preservation device 62 and the tank body 31. In the recovery process step 83, the mounting device 41 and the layered structure 900 are first placed in the empty tank body 31, and then the liquid molten salt heated to a predetermined temperature by the heating device 61 is injected into the tank body 31 through the molten salt container 51 and the delivery pipe 52 of the pump body device 53, thereby eliminating the risk of disturbance and shaking.

[0082] Molten salt heating cracking treatment step 833. After the controller 74 controls the closing of the conveying pipes 52 of the pump body device 53, the controller 74 controls the closing of the door bodies 221 to seal the recycling processing space 310, and starts timing the predetermined processing time. At the same time, the controller 74 controls the activation of the insulation devices 62, so that the insulation devices 62 heat the molten salt 910 in the tank bodies 31 to maintain the predetermined insulation temperature. The practicable range of the predetermined insulation temperature is between 200 and 550°C, and the preferred range is between 300 and 550°C.

[0083] During the predetermined processing time of the molten salt heating and cracking treatment step 833, the layered structure is completely immersed in the molten salt in the recycling processing space, and the solidified adhesive in the layered structure 900 will contact the molten salt 910. The molten salt 910 heats and cracks the solidified adhesive in each layered structure 900, thereby separating the layered objects 901 originally bonded by the adhesive 902, and generating the recycling product to be recycled. The structure of the layered structure 900 can be seen in FIG. Figure 2 .

[0084] Step 834 of taking out the recovered product. After the predetermined processing time is over, the control device 7 controls the pump device 53 to pump the molten salt 910 in the recovery processing space 310 back into the molten salt container 51. When the controller 74 determines that the sensing results of the liquid level sensors 72 represent that the molten salt 910 has reached the predetermined low water level, that is, when the liquid level of the molten salt 910 in the recovery processing space 310 (in the tank 31) is lower than the bottom of the layered structure 900, the door bodies 221 are opened and the transfer devices 42 are controlled to move the holders 41 upward out of the recovery processing space 310 to perform the cooling step 84. At this time, the layered object 901 produced by the recovery processing of the layered structure 900 and peeled off can be obtained. Taking the recovery processing of the layered structure 900 such as the solar cell module as an example, the independently separated glass cover plate, back plate and photovoltaic panel will be obtained.

[0085] After the present invention uses molten salt to crack the adhesive in the layered structure, the molten salt in the barrel device is first discharged to a predetermined low water level, and then the cover of the barrel device is opened, and then the holder carrying the separated layered objects is moved upward out of the barrel device. With this design, in addition to reducing the hot air that escaping from the molten salt, it can also reduce the resistance when the holder and the layered objects are moved upward out of the barrel device, and greatly reduce the molten salt attached to the holder and the layered objects. In the process of moving the holder out of the barrel device, it can reduce the situation where the molten salt still attached to the surface of the layered object encounters relatively low temperature air outside and is cooled and solidified and attached to the holder or the layered objects, which can improve the yield and efficiency of subsequent recycling of the separated layered objects.

[0086] See also Figure 4 , Figure 6 , Fig.12 , cooling step 84. After the recovery step 83 is completed, the controller 74 starts to execute the cooling program. The controller 74 controls the transfer device 42 to move the mounting device 41 upward into the second temperature adjustment zone 213, that is, to move the recovery product upward out of the recovery processing space 310, and stay in the second temperature adjustment zone 213 for a first cooling time. During the first cooling time, the residual liquid molten salt 910 still attached to the recovery product (layered object 901) can drip down the recovery processing space 310, so that the layered objects 901 are gradually cooled to a temperature close to the ambient temperature of the second temperature adjustment zone 213.

[0087] See also Figure 6 , Fig.13 , Fig.14 Then, the controller 74 controls the transfer device 42 to move the mounting device 41 horizontally to the third temperature adjustment zone 214 and keep it there for a second cooling time. At the same time, the controller 74 also controls the cooling device 69 to start, so that the cooling device 69 generates the heat dissipation airflow 690 in the third temperature adjustment zone 214. At this time, the heat dissipation airflow 690 can be used to increase the cooling speed of the recovered product in the mounting device 41.

[0088] Then, the controller 74 controls the door unit 22 to switch to the third position, and the second door 222 closes the recycling processing space 310 and the second temperature adjustment zone 213 to prevent the heat energy in the recycling processing space 310 from further diffusing to the temperature adjustment space 211, and the third temperature adjustment zone 214 is connected to the outside. The controller 74 continues to control the transfer device 42 to keep the mounting device 41 in the third temperature adjustment zone 214 for a third cooling time, and continues to control the start-up of the cooling device 69 to further increase the cooling speed of the recycled product in the mounting device 41 and make the temperature of the recycled product closer to the external environment temperature.

[0089] See also Figure 4 , Figure 6 , Fig.15 , discharging step 85. After the cooling step 84 is completed, the controller 74 controls the transfer device 42 to move the mounting device 41 downward out of the third temperature adjustment zone 214, thus completing the recycling process. At this time, the layered object 901 produced by the recycling can be taken out from the mounting device 41.

[0090] The recycling system and recycling method of the present invention, by controlling the transfer device 42, can allow the layered structure 900 to stay in the first temperature adjustment zone 212, the second temperature adjustment zone 213, and the third temperature adjustment zone 214 of the present invention for a predetermined period of time before being moved from the outside into the recycling processing space 310 and injected with molten salt, and before the layered structure 900 is moved from the recycling processing space 310 to the outside after cracking is completed, so that the temperature difference between the temperature of the layered structure 900 and the working temperature required for each recycling process is reduced, which can not only improve the efficiency of the recycling process, but also avoid the layered object 901 in the layered structure 900 being broken due to the drastic temperature difference, thereby reducing the recycling and reuse results.

[0091] In this embodiment, the transfer device 42 can be controlled to lift the mounting device 41 up and down between the first temperature adjustment zone 212 and the outside world, and lift the mounting device 41 up and down between the third temperature adjustment zone 214 and the outside world. However, in another embodiment of the present invention, the first temperature adjustment zone 212 and the third temperature adjustment zone 214 can be designed to be laterally connected to the outside world, and the transfer device 42 can be correspondingly designed to laterally transfer the mounting device 41 between the first temperature adjustment zone 212 and the outside world, and between the third temperature adjustment zone 214 and the outside world.

[0092] See also Fig.16 The third embodiment of the recycling system 200 for cured adhesive-bonded layered structures 900 of the present invention differs from the second embodiment in the structural design of the cavity device 2, the cooling device 69 and the transfer device 4, and the step design of the corresponding recycling method. For the convenience of description, only the differences between the embodiments will be described below.

[0093] In the third embodiment, the temperature adjustment space 211 only has the first temperature adjustment zone 212 and the second temperature adjustment zone 213 connected to each other. The transfer device 42 can be controlled to transfer the mounting device 41 between the outside, the first temperature adjustment zone 212, the second temperature adjustment zone 213 and the recycling processing space 310. The cooling device 69 is disposed in the first temperature adjustment zone 212.

[0094] The door unit 22 only has the first door 221, and the door unit 22 can be controlled to change between the first position and the second position. When the door unit 22 is in the first position, the first temperature adjustment zone 212 is connected to the outside, and the first door 221 seals and separates the second temperature adjustment zone 213 from the recycling processing space 310. When the door unit 22 is in the second position, the first door 221 seals the first temperature adjustment zone 212 from the outside, and the second temperature adjustment zone 213 is connected to the recycling processing space 310.

[0095] See also Figure 4 , Figure 6 , Fig.16 The differences between the recycling method of the layered structure 900 performed by the recycling system 200 and the second embodiment are described as follows.

[0096] In the heating step 812 of the heat treatment medium preparation step 81 , the controller 74 executes the medium heating program, controls the door unit 22 to be located at the second position, and controls the insulation devices 61 , 62 to heat and insulate the molten salt container 51 and the molten salt 910 in the recovery processing space 310 .

[0097] In the preheating step 82, the controller 74 executes the preheating procedure and controls the door unit 22 to change to the first position, and controls the transfer device 42 to move the mounting tool 41 into the first temperature adjustment zone 212, and then controls the door unit 22 to change to the second position again. The controller 74 controls the transfer device 42 to keep the mounting tool 41 in the first temperature adjustment zone 212 for the initial preheating time. Then, the controller 74 controls the transfer device 42 to move the mounting tool 41 into the second temperature adjustment zone 213, and keeps the mounting tool 41 in the second temperature adjustment zone 213 for the high temperature preheating time.

[0098] In the recycling step 83, the controller 74 executes the recycling procedure and controls the transfer device 42 to move the mounting device 41 into the empty recycling space 310 and start injecting molten salt until the molten salt liquid level completely covers the top of the layered structure 900, so that the mounting device 41 stays in the recycling space 310 for the processing time. At this time, the molten salt 910 contacts and gradually decomposes the solidified adhesive of the layered structure 900 in the mounting device 41.

[0099] In the cooling step 84, the controller 74 executes the cooling procedure. The controller 74 pumps the molten salt 910 in the recycling space 310 back to the molten salt container 51 until the remaining molten salt 910 in the recycling space 310 does not soak into the bottom of the layered structure 900. Then, the controller 74 controls the transfer device 42 to move the mounting device 41 from the recycling space 310 from which the molten salt has been emptied to the second temperature adjustment zone 213, and after the mounting device 41 stays in the second temperature adjustment zone 213 for the first cooling time, the layered object (not shown) in the mounting device 41 is initially cooled down. Then, the controller 74 controls the transfer device 42 to move the mounting device 41 to the first temperature adjustment zone 212, so that the mounting device 41 stays in the first temperature adjustment zone 212 for the second cooling time, and the controller 74 controls the activation of the cooling device 69 to accelerate the cooling down of the layered object in the mounting device 41 by using the heat dissipation airflow 690. Next, the controller 74 controls the door unit 22 to change to the first position, so that the first temperature adjustment zone 212 is connected to the outside, and the mounting device 41 continues to stay in the first temperature adjustment zone 212 for the third cooling time, and the controller 74 controls the cooling device 69 to continue to operate, so as to accelerate the cooling of the layered object.

[0100] In the unloading step 85 , the controller 74 controls the transfer device 42 to move the mounting device 41 out of the first temperature adjustment zone 212 , thereby completing the recycling process.

[0101] Through the structural design of the chamber device 2, the cooling device 69 and the transfer device 4, and the control function design of the control device 7, the third embodiment can also use the molten salt 910 to perform the recycling operation of the layered structure 900, but the volume of the recycling system can be reduced.

[0102] Fig.17: is a structural schematic diagram of the fourth embodiment of the recycling system for the layered structure bonded by the cured adhesive of the present invention. In the fourth embodiment, the machine structure of the recycling system is designed to be horizontal, and its transfer equipment only needs to move horizontally without lifting and lowering. The recycling system also includes a barrel tank device of a tank body 31, a molten salt supply device 5 connected to the tank body 31 and containing molten salt 910, a heating device 61 arranged on the molten salt supply device 5, a heat preservation device 62 in contact with the tank body 31, a cooling device 69, a transfer device 4, and a control device 7. The control device 7 is signal-connected to the cavity device 2, the barrel tank device, the molten salt supply device 5, the heating device 61, the heat preservation device 62, the cooling device 69 and the transfer device 4. The molten salt supply device 5 includes: a molten salt container 51, and a pump body device 53 (including a delivery pipe 52). The control device 7 includes a first temperature sensor 71, a liquid level sensor 72, a second temperature sensor 73, and a controller 74. Since the structures, connection relationships and functions of the above-mentioned elements of the fourth embodiment of the recycling system are the same as those of the first embodiment, the details thereof will not be repeated.

[0103] At Fig.17 In the fourth embodiment shown, the cavity equipment 2 of the recovery system has five spaces arranged horizontally, which are, in sequence, a feed area 241, a preheating area 242, a recovery tank area 243, a cooling area 244, and a discharge area 245. Switchable gates 225, 226, 227, and 228 are provided between each area, and in particular, the two gates 226 and 227 provided in the recovery tank area 243 are sealed gates that can prevent liquid leakage.

[0104] The feeding zone 241 is connected to the outside, and the temperature of the feeding zone 241 is generally close to the outside temperature, generally between 10 and 50°C. The mounting device 41 on which the layered structure 900 is placed is horizontally moved to the feeding zone 241 by the transfer device 42 on the track unit 40 at the outside temperature. Afterwards, the first gate 225 located between the feeding zone 241 and the preheating zone 242 is opened, and the transfer device 42 horizontally moves the mounting device 41 and the layered structure 900 into the preheating zone 242, and then the first gate 225 is closed. Because the preheating zone 242 is adjacent to the recovery tank zone 245, the temperature of the preheating zone 242 will be heated to between 100 and 200°C due to the high temperature of the tank body 31 in the recovery tank zone 245. The mounting device 41 and the layered structure 900 stay in the preheating zone 242 for ten minutes to one hour, so that the temperature of the mounting device 41 and the layered structure 900 is also preheated to 100-200° C. At this time, the tank body 31 in the recovery tank area 243 is empty, and the molten salt has not yet been injected, and the high temperature of 200-550° C. is maintained by the heat preservation device 62. Next, the second gate 226 located between the preheating zone 242 and the recovery tank area 243 is opened, and the transfer device 42 moves the mounting device 41 and the layered structure 900 horizontally into the empty tank body 31 in the recovery tank area 243, and then closes the second gate 226. At this time, the third gate 227 located between the recovery tank area 243 and the cooling zone 244 is also closed. Next, the high-temperature liquid molten salt 910 of 200-550° C. in the molten salt container 51 is injected into the tank body 31 in the recovery tank area 243 until the molten salt 910 completely submerges the top of the layered structure 900. The mounting device 41 and the layered structure 900 are immersed in the molten salt 910 in the tank body 31 of the recovery tank area 243 for ten minutes to one hour, and the heat preservation device 62 maintains the temperature of the molten salt 910 in the tank body 31 at a high temperature of 300-550° C., so that the adhesive of the layered structure 900 is cracked and the layered objects are separated. Then, the molten salt 910 in the tank body 31 is pumped back to the molten salt container 51 until the tank body 31 is emptied, and then the third gate 227 is opened, and the transfer device 42 moves the mounting device 41 and the layered structure 900 into the cooling area 244. After that, the third gate 227 is closed, and the cooling device 69 is started to cool the temperature of the mounting tool 41 and the layered structure 900 in the cooling zone 244 for ten minutes to one hour until the temperature of the mounting tool 41 and the layered structure 900 is reduced to below 200° C., and then the fourth gate 228 between the cooling zone 244 and the outside world 245 is opened, and the transport device 42 transports the mounting tool 41 and the layered structure 900 to the outside world.

[0105] In the fourth embodiment, the track unit 40 may be a circulating track on which a plurality of transfer devices 42 are disposed, and each transfer device 42 is respectively connected to a group of the mounting apparatus 41 and the layered structure 900 for translation. The recycling process adopts a continuous batch operation. For example, when a group of the mounting apparatus 41 and the layered structure 900 is located in the recycling tank area 243 for cracking operation, the previous group of the mounting apparatus 41 and the layered structure 900 that have completed the cracking operation is located in the cooling area 244 for cooling operation, and at the same time, the next group of the mounting apparatus 41 and the layered structure 900 is located in the preheating area 242 for preheating operation. In this way, not only the recycling efficiency of the recycling method of the present invention can be greatly improved, but also the transfer device 42 does not need to lift the mounting apparatus 41 up and down, so the mechanism is simpler and easier to maintain.

[0106] In another embodiment not shown in the figure, the tank body 31 is a double-layer design. The inner layer of the tank body 31 is a recycling and processing space for accommodating the mounting device 41 and the layered structure 900, and an interlayer space is provided in the tank wall for molten salt injection. When the temperature of the inner recycling and processing space reaches about 150-200°C, the liquid molten salt is injected into the interlayer space. At this time, the mounting device 41 and the layered structure 900 are not in direct contact with the molten salt. The high temperature of the molten salt raises the temperature of the interlayer space of the tank body 31 and the tank wall to between 200-550°C, thereby performing high-temperature cracking of the layered structure 900 located in the inner recycling and processing space.

[0107] In another embodiment not shown in the figure, the device is of closed design. The layered structure 900 is completely covered by the device and then immersed in the high-temperature molten salt, so that the layered structure has no direct contact with the molten salt, and the layered structure 900 located in the inner layer recovery and processing space is only subjected to high-temperature cracking by the high temperature of 200-550°C.

[0108] In summary, the present invention can utilize the molten salt 910 to heat and crack the solidified adhesive 902 in the layered structure 900 through the structural design of the barrel tank device 3 and the molten salt supply device 5, the structural design of the recycling and processing space 310 and the temperature adjustment space 211 of the cavity 21, the structural design of the door unit 22, and the structural design of the transfer device 4 and the control device 7, so as to separate the layered objects 901 bonded by the adhesive 902, and then obtain the layered objects 901 with a complete structure. When used for the recycling of solar cell modules, the glass cover plate, the back plate and the photovoltaic panels with a complete structure can be obtained, so the shortcomings of the existing recycling methods such as direct heating and cracking, mechanical stripping or scraping can be improved. Therefore, the recycling system 200 and recycling method for the layered structure 900 bonded with a cured adhesive of the present invention are indeed quite innovative, convenient and practical creations, and can indeed achieve the purpose of the present invention.

[0109] What is described above is only an embodiment of the present invention, and should not be used to limit the scope of implementation of the present invention. All simple equivalent changes and modifications made according to the claims and description of the present invention are still within the scope of the patent of the present invention.

Claims

1. A system for recovering layered structures bonded with cured adhesives, characterized in that: Include: At least one container, each of which can accommodate a plurality of layered structures; At least one tank, each of which has a recycling processing space for accommodating the device; A molten salt container for containing molten salt; a heating device connected to the molten salt container, capable of heating the molten salt contained in the molten salt container; At least one pump device is connected to the molten salt container and the tank body, and can transport the molten salt contained in the molten salt container into the recovery processing space of the tank body, and pump the molten salt contained in the recovery processing space back to the molten salt container; a heat preservation device connected to the tank body, capable of heating the molten salt contained in the recycling and processing space of the tank body; a transfer device capable of transferring the mounting device and the plurality of layered structures contained in the mounting device into or out of the recycling processing space of the tank; and a control device, the signal of which is connected to the heating device, the pump device, the heat preservation device and the transfer device; The control device performs the following control functions: Controlling the heating device to heat the molten salt contained in the molten salt container to make it reach a molten state; controlling the transfer device so that the transfer device transfers the mounting device and the plurality of layered structures contained in the mounting device into the recycling space of the tank body when the liquid level of the molten salt in the recycling space of the tank body is lower than a predetermined low water level; controlling the pump device so that the pump device transports the molten salt contained in the molten salt container into the recycling space of the tank body when the device and the plurality of layered structures are contained in the recycling space of the tank body, until the liquid level of the molten salt contained in the recycling space of the tank body reaches a predetermined high water level; Controlling the heat preservation device to heat the molten salt in the recycling and processing space of the tank body so that the molten salt in the recycling and processing space is maintained at a predetermined heat preservation temperature; When the liquid level of the molten salt transported to the recycling space reaches the predetermined high water level, the control device starts timing a predetermined processing time, and after the predetermined processing time ends, controls the pump device to pump the molten salt in the recycling space back to the molten salt container in a state where the mounting device and the plurality of layered structures are still located in the recycling space, until the liquid level of the molten salt in the recycling space is lower than the predetermined low water level; When the predetermined processing time is over and the liquid level of the molten salt in the recycling processing space is lower than the predetermined low water level, the control device controls the transfer device to enable the transfer device to transfer the mounting device and the plurality of layered structures contained in the mounting device out of the recycling processing space of the tank body; The predetermined low water level is lower than the bottom of the plurality of layered structures contained in the device, and the predetermined high water level is higher than the top of the plurality of layered structures contained in the device.

2. The recycling system according to claim 1, characterized in that: It also includes a cavity device and a cooling device; wherein: The cavity device comprises a cavity and a door unit installed in the cavity; a temperature-adjusting space is defined inside the cavity, which can be connected to the recycling processing space; the door unit can be controlled by the control device to change between a first position that enables the temperature-adjusting space to be connected to the outside and closes the recycling processing space, and a second position that separates the temperature-adjusting space from the outside and enables the temperature-adjusting space to be connected to the recycling processing space; The temperature-adjusting space has a first temperature-adjusting zone connected to the outside, and a second temperature-adjusting zone connected to the first temperature-adjusting zone and the recycling and processing space; the door unit has a first door; when the door unit is located at the first position, the first door closes the second temperature-adjusting zone and the recycling and processing space, and the first temperature-adjusting zone is connected to the outside; when the door unit is located at the second position, the first door closes the first temperature-adjusting zone and the outside, and the second temperature-adjusting zone is connected to the recycling and processing space; When the control device is activated to have a recycling function, a preheating procedure, a recycling procedure and a cooling procedure are successively executed; when the control device is executing the preheating procedure, the control device controls the transfer device to move the equipment from the outside into the first temperature adjustment zone, then controls the door unit to change to the second position, and after a preliminary preheating time, controls the transfer device to move the equipment into the second temperature adjustment zone and stay there for a high temperature preheating time; when the control device is executing the recycling procedure, the control device controls the transfer device to move the equipment into the recycling processing space; when the control device is executing the cooling procedure, the control device controls the transfer device to move the equipment from the recycling processing space into the second temperature adjustment zone and stay there for a first cooling time, then controls the transfer device to move the equipment into the first temperature adjustment zone and stay there for a second cooling time, then controls the door unit to change to the first position, and controls the transfer device to move the equipment out of the first temperature adjustment zone; The cooling device is disposed in the cavity and is signal-connected to the control device; the cooling device can be controlled by the control device to start up and generate a heat dissipation airflow in the first temperature adjustment zone; when executing the cooling program, the control device controls the transfer device to move the device into the first temperature adjustment zone during the second cooling time, and controls to start up the cooling device.

3. The recycling system according to claim 1, characterized in that: It also includes a cavity device and a cooling device; wherein: The cavity device comprises a cavity and a door unit installed in the cavity; a temperature-adjusting space is defined inside the cavity, which can be connected to the recycling processing space; the door unit can be controlled by the control device to change between a first position that enables the temperature-adjusting space to be connected to the outside and closes the recycling processing space, and a second position that separates the temperature-adjusting space from the outside and enables the temperature-adjusting space to be connected to the recycling processing space; The temperature control space has a first temperature control interval and a third temperature control interval connected to the outside world, and a second temperature control interval connected between the first temperature control interval and the second temperature control interval and connected to the top of the recycling and processing space; the door unit can be controlled to change between the first position, the second position and a third position; when the door unit is located at the first position, the first temperature control interval is connected to the outside world and separates the recycling and processing space from the second temperature control interval, and separates the third temperature control interval from the outside world; when the door unit is located at the second position, the recycling and processing space is connected to the second temperature control interval, and separates the first temperature control interval from the outside world, and separates the third temperature control interval from the outside world; when the door unit is located at the third position, the third temperature control interval is connected to the outside world, separates the recycling and processing space from the second temperature control interval, and separates the first temperature control interval from the outside world; When the control device is activated to have a recycling function, a preheating procedure, a recycling procedure and a cooling procedure are successively executed; when the control device is executing the preheating procedure, the control device controls the transfer device to move the equipment from the outside into the first temperature adjustment zone, then controls the door unit to change to the second position, and after a preliminary preheating time, controls the transfer device to move the equipment into the second temperature adjustment zone and stay there for a high temperature preheating time; when the control device is executing the recycling procedure, the control device controls the transfer device to move the equipment into the recycling processing space; when the control device is executing the cooling procedure, the control device controls the transfer device to move the equipment from the recycling processing space into the second temperature adjustment zone and stay there for a first cooling time, then controls the transfer device to move the equipment into the third temperature adjustment zone and stay there for a second cooling time, then controls the door unit to change to the third position, and controls the transfer device to move the equipment out of the third temperature adjustment zone; The cooling device is disposed in the cavity and is signal-connected to the control device; the cooling device can be controlled by the control device to start up and generate a heat dissipation airflow in the third temperature adjustment zone; when executing the cooling program, the control device controls the transfer device to move the device into the third temperature adjustment zone during the second cooling time, and starts up the cooling device; The temperature of the first temperature adjustment zone is maintained between 100 and 200°C, the temperature of the second temperature adjustment zone is maintained between 200 and 350°C, the temperature of the third temperature adjustment zone is lower than 200°C, and the temperature of the molten salt in the tank is maintained at a high temperature of 300 to 550°C by a heat preservation device.

4. The recovery system according to claim 3, characterized in that: The control device includes a liquid level sensor disposed on the tank body and a first temperature sensor disposed on the molten salt container; the liquid level sensor can sense the liquid level of the molten salt in the recycling and processing space; when the molten salt is injected into the recycling and processing space, the control device will stop injecting the molten salt when it is determined that the liquid level measured by the liquid level sensor has reached the predetermined high water level; when the control device controls the pump body device to pump the molten salt in the recycling and processing space back to the molten salt container, the control device will control the pump body device to stop operating when it is determined that the liquid level measured by the liquid level sensor has been lower than the predetermined low water level; The first temperature sensor can sense the temperature of the molten salt in the molten salt container. When the control device is operated to start the recovery process, when it is determined that the molten salt measured by the first temperature sensor has reached a predetermined melting temperature, the pump body device is controlled to start transporting the molten salt contained in the molten salt container into the recovery process space of the tank body.

5. The recovery system according to claim 4, characterized in that: The molten salt is prepared by adding an additional pure potassium element to a potassium nitrate molten salt, so that the weight percentage of potassium in the modulated molten salt is higher than that in the pure potassium nitrate molten salt; wherein the weight percentage of the additional pure potassium element added to the potassium nitrate molten salt is in the range of 5% to 15% of the weight percentage of the potassium nitrate molten salt, so that the weight percentage of the potassium component in the molten salt is in the range of 41.6% to 46.68%.

6. A method for recovering a layered structure bonded with a cured adhesive, characterized in that: The following steps are involved: a heat treatment medium preparation step, preparing a molten salt with potassium nitrate as the main component, placing the prepared molten salt in a molten salt container, and then using a heating device to heat the molten salt in the molten salt container to a predetermined heat treatment temperature, so that the molten salt becomes a fluid; a preheating step, in which a control device controls a transfer device to move a container containing a plurality of layered structures into a temperature-adjusting space for preheating treatment, thereby reducing the temperature difference between the layered structures and the molten salt; A recycling process step, the recycling process step further comprising the following steps: a step of placing the layered structure, wherein the control device causes the transfer device to place the mounting device together with the layered structure that has completed the preheating treatment into a recovery processing space of a tank; at this time, the liquid level of the molten salt in the tank is not high enough to soak the bottom of the layered structure; a molten salt filling step, wherein the control device injects the molten salt heated to the predetermined heat treatment temperature from the molten salt container into the recovery processing space of the tank body until the liquid level of the molten salt has completely submerged the top of the layered structure; and the control device causes a heat preservation device to heat the molten salt in the recovery processing space of the tank body and maintain it at a predetermined heat preservation temperature; and a molten salt heating cracking treatment step, wherein the layered structure is immersed in the molten salt in the recycling treatment space, and a viscose in the layered structure is allowed to contact the molten salt for a treatment time, so that a plurality of layered objects originally bonded by the viscose in the layered structure are separated to produce a recycling product; and a step of taking out the recovered product, wherein after the processing time is over, the control device controls a pump device to pump the molten salt in the recovery processing space back to the molten salt container until the liquid level of the molten salt in the recovery processing space is lower than the bottom of the layered structure; a cooling step, wherein the control device causes the transfer device to move the device and the recovered product produced after the layered structure is treated with the molten salt from the recovery processing space into the temperature adjustment space for cooling treatment after the treatment time is completed and the liquid level of the molten salt in the recovery processing space is lower than the bottom of the layered structure; and In a discharging step, the control device enables the transfer device to move the recovered product out of the temperature adjustment space after the recovered product completes the cooling treatment.

7. The recycling method according to claim 6, characterized in that: The temperature control space has a first temperature control interval and a second temperature control interval connected to the recycling processing space and the first temperature control interval; in the preheating step, the transfer device first moves the layered structure into the first temperature control interval and keeps it for a preliminary preheating time, and then the transfer device moves the layered structure into the second temperature control interval and keeps it for a high-temperature preheating time, and then the recycling processing step is continuously performed.

8. The recycling method according to claim 7, characterized in that: In the cooling step, the transfer device is controlled to move the recovered product into the second temperature adjustment interval and keep it there for a first cooling time, and then the transfer device is controlled to move the recovered product into the first temperature adjustment interval and keep it there for a second cooling time. During the second cooling time, a cooling device is controlled to generate a heat dissipation airflow flowing through the recovered product in the first temperature adjustment interval, and then the discharging step is performed.

9. The recycling method according to claim 7, characterized in that: The temperature control space also has a third temperature control interval; the second temperature control interval is connected between the first temperature control interval, the third temperature control interval and the recycling and processing space; in the cooling step, the transfer device moves the recovered product into the second temperature control interval and keeps it for a first cooling time, and then controls the transfer device to move the recovered product into the third temperature control interval and keeps it for a second cooling time, and controls a cooling device to generate a heat dissipation airflow flowing through the recovered product in the third temperature control interval during the second cooling time, and then performs the discharging step; wherein, the temperature of the first temperature control interval is maintained between 100 and 200°C, the temperature of the second temperature control interval is maintained between 200 and 350°C, the temperature of the third temperature control interval is lower than 200°C, and the temperature of the molten salt in the tank body is maintained at a high temperature of 300 to 550°C by the insulation device.

10. The recycling method according to claim 9, characterized in that: The molten salt prepared in the heat treatment medium preparation step is prepared by adding an additional pure potassium element to a potassium nitrate molten salt, so that the weight percentage of potassium in the prepared molten salt is higher than that in the pure potassium nitrate molten salt; wherein the weight percentage of the additional pure potassium element added to the potassium nitrate molten salt is in the range of 5% to 15% of the weight percentage of the potassium nitrate molten salt, so that the weight proportion of the potassium component in the molten salt is in the range of 41.6% to 46.68%.

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