Industrial regeneration system for lithium iron phosphate battery

Abstract

The utility model relates to an industrial regeneration system for a lithium iron phosphate battery. The system comprises a pretreatment device, a feeding device, a regeneration device, a discharging device, a drying device and a calcining device, the pretreatment device is used for disassembling the lithium iron phosphate battery to obtain positive electrode powder of the lithium iron phosphate battery; the regeneration device is used for carrying out regeneration treatment on the positive electrode powder poured through the feeding device to obtain a regenerated lithium iron phosphate positive electrode material; the drying device is used for drying the regenerated lithium iron phosphate positive electrode material discharged by the discharging device; and the calcining device is used for performing pyrolysis calcining treatment on the dried regenerated lithium iron phosphate positive electrode material to obtain the calcined regenerated lithium iron phosphate positive electrode material. According to the technical scheme provided by the utility model, lithium iron phosphate can be regenerated, so that the lithium iron phosphate is recovered to the initial electrochemical performance for reuse, and the cycle life of the battery is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium iron phosphate battery regeneration technical field, specifically related to a lithium iron phosphate battery industrialization regeneration system. BACKGROUND

[0002] The retired power lithium battery mainly contains two categories of ternary lithium and lithium iron phosphate battery. The valuable metal of lithium iron phosphate battery only contains lithium and the present lithium price is low, and the recovery value is not high. At the same time, the recovery rate of the recovery and utilization technology of the prior art to the lithium iron phosphate battery is low, under the condition that the future power battery gradually takes lithium iron phosphate as the mainstream, the efficient resource recovery technical means of lithium iron phosphate battery is particularly important, therefore, it is urgent to propose a system that can efficiently recover the resource of lithium iron phosphate battery. SUMMARY

[0003] The utility model provides a lithium iron phosphate battery industrialization regeneration system to at least solve the technical problem of low recovery rate of the recovery and utilization technology of the lithium iron phosphate battery in the related art.

[0004] The utility model discloses a lithium iron phosphate battery industrialization regeneration system, the system includes: pretreatment device, feeding device, regeneration device, discharge device, drying device, calcining device;

[0005] The pretreatment device, the feeding device, the regeneration device, the discharge device, the drying device and the calcining device are connected in sequence.

[0006] The pretreatment device is used for disassembling and processing the lithium iron phosphate battery to obtain the positive electrode powder of the lithium iron phosphate battery.

[0007] The regeneration device is used for regenerating and processing the positive electrode powder poured through the feeding device to obtain regenerated lithium iron phosphate positive electrode material.

[0008] The drying device is used for drying the regenerated lithium iron phosphate positive electrode material discharged through the discharge device.

[0009] The calcining device is used for pyrolysis and calcining treatment of the regenerated lithium iron phosphate positive electrode material after drying to obtain the calcined regenerated lithium iron phosphate positive electrode material.

[0010] Preferably, the system further comprises a circulating pump.

[0011] The circulating pump is connected with the regeneration device and the discharge device respectively.

[0012] The regeneration device stores regenerated lithium aqueous solution.

[0013] The circulating pump is used to extract the regenerated lithium aqueous solution in the discharging device to the regeneration device.

[0014] Further, the pretreatment device comprises a cutting device, a disassembling device, a low-temperature evaporation device, and a dissolving device.

[0015] The cutting device is used to cut the lithium iron phosphate battery at both ends to obtain a roll core.

[0016] The disassembling device is used to disassemble the roll core to obtain a battery diaphragm, a positive electrode material, and a negative electrode material.

[0017] The low-temperature evaporation device is used to evaporate the electrolyte of the lithium iron phosphate battery in the disassembling process at low temperature to realize electrolyte recovery.

[0018] The dissolving device is used to perform solvent extraction treatment on the positive electrode material to obtain a positive electrode powder.

[0019] Further, the feeding device comprises a material valve, a material bin, a feeding port, a conveyor, and a sealed port.

[0020] The sealed port is arranged above the material bin.

[0021] The material bin is connected with the regeneration device through the conveyor, and the material valve is connected with the material bin.

[0022] Further, the regeneration device comprises a hydrothermal device, a control device, and a stirring device.

[0023] The hydrothermal device is used to store an aqueous solution containing regenerated lithium and regenerate the lithium iron phosphate positive electrode material through the dissolution recrystallization effect of the hydrothermal reaction.

[0024] The control device is connected with the hydrothermal device, and the control device is used to monitor the reaction temperature, pressure, and liquid level of the hydrothermal reaction and perform dynamic adjustment.

[0025] An opening is arranged above the hydrothermal device, the stirring device is placed in the hydrothermal device through the opening, and the stirring device is used to stir the solution of the hydrothermal device.

[0026] Further, the regeneration device further comprises a first protection device.

[0027] The first protection device comprises a pressure relief port and an alarm device.

[0028] The alarm device is used to alarm when the pressure is higher than a preset pressure threshold or the temperature is greater than a preset temperature threshold.

[0029] The pressure relief port is used to relieve pressure when the pressure is higher than a preset pressure.

[0030] Further, the discharging device comprises a discharging valve, a discharging port and a receiving pool.

[0031] The discharging port is arranged at the bottom of the side of the hydrothermal device, the discharging valve is arranged at the discharging port, and the receiving pool is arranged below the discharging port.

[0032] Further, the discharging device further comprises a discharging pump.

[0033] The discharging pump is used for pumping the solution in the hydrothermal device.

[0034] Further, the drying device comprises a pumping pump, a trolley, a conveying device and a dryer.

[0035] The pumping pump is connected with the receiving pool and the trolley respectively.

[0036] The pumping pump is used for pumping the regenerated lithium iron phosphate positive electrode material in a static state.

[0037] The trolley is used for carrying out solid-liquid separation on the pumped regenerated lithium iron phosphate positive electrode material and carrying and transporting the regenerated lithium iron phosphate positive electrode material.

[0038] The conveying device is used for conveying the trolley to the dryer area.

[0039] The dryer is used for drying the regenerated lithium iron phosphate positive electrode material.

[0040] Further, the calcining device comprises a feeding device, a calciner, a second protection device and a discharging device.

[0041] The feeding device is connected with the calciner, and the calciner is used for pyrolysis calcination treatment on the regenerated lithium iron phosphate positive electrode material sent in through the feeding device, so as to obtain the calcined regenerated lithium iron phosphate positive electrode material.

[0042] The second protection device is connected with the calciner, and the second protection device is used for providing protection gas for the calciner.

[0043] The discharging device is used for conveying the calcined regenerated lithium iron phosphate positive electrode material out.

[0044] The technical scheme provided by the embodiment of the utility model has at least the following beneficial effects:

[0045] The utility model provides a kind of lithium iron phosphate battery industrialization regeneration system provided by the utility model, the system includes: pretreatment device, feeding device, regeneration device, discharge device, drying device, calcining device;The pretreatment device, the feeding device, the regeneration device, the discharge device, the drying device, the calcining device are sequentially connected;The pretreatment device is used to disassemble and process lithium iron phosphate battery, and the positive electrode powder of lithium iron phosphate battery is obtained;The regeneration device is used to regenerate the positive electrode powder poured by the feeding device and is handled, and the regenerated lithium iron phosphate positive material is obtained;The drying device is used to dry the regenerated lithium iron phosphate positive material discharged by the discharge device;The calcining device is used to pyrolysis calcining treatment to the regenerated lithium iron phosphate positive material after drying, and the calcined regenerated lithium iron phosphate positive material is obtained.The technical scheme provided by the utility model can regenerate lithium iron phosphate, restore initial electrochemical performance and be reused, and can effectively improve battery cycle life, and the system can be industrialized continuous production, and production efficiency is high.

[0046] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0047] The above and / or additional aspects and advantages of the utility model will become apparent and more readily understood from the following description of embodiments, in conjunction with the accompanying drawings, in which:

[0048] Figure 1 It is the first kind of structure diagram of lithium iron phosphate battery industrialization regeneration system provided according to one embodiment of the utility model;

[0049] Figure 2 It is the second kind of structure diagram of lithium iron phosphate battery industrialization regeneration system provided according to one embodiment of the utility model;

[0050] Figure 3 It is the structure diagram of pretreatment device provided according to one embodiment of the utility model;

[0051] Figure 4 It is the structure diagram of feeding device provided according to one embodiment of the utility model;

[0052] Figure 5 It is the structure diagram of regeneration device provided according to one embodiment of the utility model;

[0053] Figure 6 It is the structure diagram of discharge device provided according to one embodiment of the utility model;

[0054] Figure 7It is a structure diagram of the drying device according to one embodiment of the utility model;

[0055] Figure 8 It is a structure diagram of the calcining device according to one embodiment of the utility model;

[0056] Reference signs:

[0057] Pretreatment device 1, feed device 2, regeneration device 3, discharge device 4, drying device 5, calcining device 6, circulating pump 7, cutting device 1-1, disassembling device 1-2, low-temperature evaporation device 1-3, dissolving device 1-4, material valve 2-1, material bin 2-2, feed inlet 2-3, conveyor 2-4, airtight opening 2-5, hydrothermal device 3-1, control device 3-2, stirring device 3-3, first protection device 3-4, pressure relief opening 3-4-1, alarm device 3-4-2, discharge valve 4-1, discharge opening 4-2, material receiving tank 4-3, discharge pump 4-4, material pumping pump 5-1, material car 5-2, conveying device 5-3, dryer 5-4, feed device 6-1, calciner 6-2, second protection device 6-3, discharge device 6-4. DETAILED DESCRIPTION

[0058] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model and cannot be understood as a limitation of the utility model.

[0059] The utility model proposes a kind of lithium iron phosphate battery industrialization regeneration system, the system includes: pretreatment device, feed device, regeneration device, discharge device, drying device, calcining device;The pretreatment device, the feed device, the regeneration device, the discharge device, the drying device, the calcining device are sequentially connected;The pretreatment device is used to disassemble and process lithium iron phosphate battery, and the positive pole powder of lithium iron phosphate battery is obtained;The regeneration device is used to regenerate the positive pole powder poured by the feed device and is handled, and the regenerated lithium iron phosphate positive pole material is obtained;The drying device is used to dry the regenerated lithium iron phosphate positive pole material discharged by the discharge device and is handled;The calcining device is used to pyrolysis calcining treatment to the regenerated lithium iron phosphate positive pole material after drying, and the calcined regenerated lithium iron phosphate positive pole material is obtained.The technical scheme provided by the utility model can regenerate lithium iron phosphate, restore initial electrochemical performance and reuse, and can effectively improve battery cycle life, and the system can be industrialized continuous production, and production efficiency is high.

[0060] The utility model discloses an embodiment of the present application refers to a kind of lithium iron phosphate battery industrial regeneration system, as shown in

[0061] Embodiment 1

[0062] Figure 1 The structure diagram of a kind of lithium iron phosphate battery industrial regeneration system provided in the embodiment of the present disclosure is as shown in Figure 1 The system includes: pretreatment device 1, feeding device 2, regeneration device 3, discharge device 4, drying device 5, calcining device 6;

[0063] The pretreatment device 1, the feeding device 2, the regeneration device 3, the discharge device 4, the drying device 5 and the calcining device 6 are connected in sequence.

[0064] The pretreatment device 1 is used for disassembling and processing lithium iron phosphate batteries to obtain positive electrode powder of the lithium iron phosphate batteries.

[0065] The regeneration device 3 is used for regenerating and processing the positive electrode powder poured through the feeding device 2 to obtain regenerated lithium iron phosphate positive electrode material.

[0066] The drying device 5 is used for drying the regenerated lithium iron phosphate positive electrode material discharged through the discharge device 4.

[0067] The calcining device 6 is used for pyrolysis and calcining the dried regenerated lithium iron phosphate positive electrode material to obtain calcined regenerated lithium iron phosphate positive electrode material.

[0068] In the embodiment of the present disclosure, as shown in Figure 2 The system further includes a circulating pump 7.

[0069] The circulating pump 7 is connected with the regeneration device 3 and the discharge device 4 respectively.

[0070] The regeneration device 3 stores regenerated lithium aqueous solution.

[0071] The circulating pump 4 is used for pumping the regenerated lithium aqueous solution in the discharge device 4 to the regeneration device 3.

[0072] It should be noted that the circulating pump 4 is mainly used for pumping lithium liquid in the discharge device 4 back for recycling.

[0073] Further, as shown in Figure 3 The pretreatment device 1 includes a cutting device 1-1, a disassembling device 1-2, a low-temperature evaporation device 1-3 and a dissolving device 1-4.

[0074] The cutting device 1-1 is used for cutting the lithium iron phosphate batteries at both ends to obtain a roll core.

[0075] The disassembling device 1-2 is used for disassembling the roll core to obtain the battery diaphragm, the positive electrode material and the negative electrode material;

[0076] The low-temperature evaporation device 1-3 is used for low-temperature evaporation of the electrolyte of the lithium iron phosphate battery in the disassembling process, so as to realize electrolyte recovery;

[0077] It should be noted that the low-temperature evaporation device 1-3 is used for low-temperature evaporation of the electrolyte in the disassembling process to recover the electrolyte;

[0078] The dissolving device 1-4 is used for solvent extraction treatment of the positive electrode material to obtain the positive electrode powder.

[0079] It should be noted that the dissolving device 1-4 is used for solvent extraction treatment of the disassembled positive electrode material to obtain the positive electrode powder from which the binder is removed, so as to facilitate subsequent regeneration treatment.

[0080] Further, as shown in Figure 4 The feeding device 2 includes a material valve 2-1, a material bin 2-2, a feeding port 2-3, a conveyor 2-4 and a sealing port 2-5.

[0081] The sealing port 2-5 is arranged above the material bin 2-2.

[0082] The material bin 2-2 is connected with the regeneration device 3 through the conveyor 2-4, and the material valve 2-1 is connected with the material bin 2-2.

[0083] It should be noted that the positive electrode powder obtained by pretreatment enters the hydrothermal regeneration reaction kettle, i.e., the hydrothermal device 3-1, from the feeding port 2-3 through the material bin 2-2, the feeding is controlled through the feeding valve 2-1, the feeding is assisted through the conveyor 2-4, the feeding port 2-5 on the upper side of the material bin is closed at the same time, and the feeding is carried out in a sealed manner to avoid pressure relief.

[0084] Further, as shown in Figure 5 The regeneration device 3 includes a hydrothermal device 3-1, a control device 3-2 and a stirring device 3-3.

[0085] The hydrothermal device 3-1 is used for storing an aqueous solution containing regenerated lithium and regenerating the lithium iron phosphate positive electrode material through the dissolution recrystallization effect of the hydrothermal reaction;

[0086] The control device 3-2 is connected with the hydrothermal device 3-1, and the control device 3-2 is used for monitoring and dynamically adjusting the reaction temperature, pressure and liquid level of the hydrothermal reaction;

[0087] The water heating device 3-1 is provided with an opening, the stirring device 3-3 is put into the stirring device 3-3 through the opening, and the stirring device 3-3 is used for stirring the solution of the water heating device 3-1.

[0088] Further, as shown in the figure, Figure 5 The regeneration device 3 further comprises a first protection device 3-4.

[0089] The first protection device 3-4 comprises a pressure relief port 3-4-1 and an alarm device 3-4-2.

[0090] The alarm device 3-4-2 is used for alarming when the pressure is higher than a preset pressure threshold or the temperature is greater than a preset temperature threshold.

[0091] The pressure relief port 3-4-1 is used for pressure relief when the pressure is higher than a preset pressure.

[0092] It should be noted that the reaction medium of the water heating device 3-1 is an aqueous solution containing regenerated lithium, the dissolution recrystallization effect of the water heating reaction is used to regenerate the lithium iron phosphate positive electrode material, the control device 3-2 is mainly used for monitoring and dynamically adjusting the reaction temperature, pressure and liquid level of the water heating, the stirring device 3-3 ensures that the reaction is a homogeneous system, and meanwhile avoids that the material sinks to the bottom and is difficult to regenerate, the first protection device 3-4 is mainly used for protecting the safety of the water heating reaction process, including the pressure relief port 3-4-1 and the alarm device 3-4-2, when the pressure is higher than the set pressure, the pressure relief port automatically relieves pressure and triggers the alarm device, and when the temperature is difficult to control and exceeds the set range, the alarm device is also triggered.

[0093] Further, as shown in the figure, Figure 6 The discharge device 4 comprises a discharge valve 4-1, a discharge port 4-2 and a receiving pool 4-3.

[0094] The discharge port 4-2 is arranged at the bottom of the side of the water heating device 3-1, the discharge valve 4-1 is arranged at the discharge port 4-2, and the receiving pool 4-3 is arranged below the discharge port.

[0095] Further, as shown in the figure, Figure 6 The discharge device 4 further comprises a discharge pump 4-4.

[0096] The discharge pump 4-4 is used for extracting the solution in the water heating device 3-1.

[0097] It should be noted that the discharge valve 4-1 controls whether to discharge, the discharge port 4-2 is used for guiding the regenerated lithium iron phosphate material, the discharge pump 4-4 assists in discharging, and the receiving pool 4-3 is used for storing the regenerated lithium iron phosphate solution.

[0098] Further, as shown in the figure,Figure 7 As shown in the figure, the drying device 5 comprises: a pumping pump 5-1, a trolley 5-2, a conveying device 5-3, and a dryer 5-4.

[0099] The pumping pump 5-1 is connected with the receiving pool 4-3 and the trolley 5-2 respectively.

[0100] The pumping pump 5-1 is used for pumping out the static regenerated lithium iron phosphate positive material.

[0101] The trolley 5-2 is used for solid-liquid separation and loading transportation of the pumped regenerated lithium iron phosphate positive material.

[0102] The conveying device 5-3 is used for conveying the trolley 5-2 to the dryer area.

[0103] The dryer 5-4 is used for drying treatment of the regenerated lithium iron phosphate positive material.

[0104] Further, as shown in the figure, the calcining device 6 comprises: a feeding device 6-1, a calciner 6-2, a second protection device 6-3, and a discharging device 6-4. Figure 8 The feeding device 6-1 is connected with the calciner 6-2, and the calciner 6-2 is used for pyrolysis calcination treatment of the regenerated lithium iron phosphate positive material sent through the feeding device 6-1, to obtain the calcined regenerated lithium iron phosphate positive material.

[0105] The second protection device 6-3 is connected with the calciner 6-2, and the second protection device is used for providing protection gas to the calciner 6-2.

[0106] The discharging device 6-4 is used for discharging the calcined regenerated lithium iron phosphate positive material.

[0107] It should be noted that the feeding device 6-1 is responsible for continuous feeding of the dried material, the calciner 6-2 is responsible for pyrolysis calcination treatment of the sent material, the second protection device 6-3 is mainly responsible for providing oxygen-free conditions for calcination, and argon and nitrogen are commonly used as protection gas, and the discharging device 6-4 is responsible for discharging the calcined material.

[0108] In summary, the lithium iron phosphate battery industrial regeneration system provided in the embodiment can realize resource recycling of retired lithium iron phosphate, and compared with the traditional regeneration technology, the present application can realize continuous regeneration, has high regeneration efficiency, can be applied on a large scale, and has high quality of regenerated material, good material uniformity, high electrochemical performance, low operation cost of the whole production line, and high safety.

[0109]

[0110] ​In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0111] Any process or method descriptions or descriptions of the flow diagrams in the flow charts described herein and elsewhere can be understood as representing modules, segments, or portions of code that include one or more executable instructions for implementing the specified logical functions or processes. The scope of the preferred embodiments of the present application includes additional implementation in which the functions described are performed in a different order, including substantially simultaneously, or in reverse order, according to the functions involved, and the skilled person in the art should understand this.

[0112] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A lithium iron phosphate battery industrial regeneration system, characterized in that, The system comprises a pretreatment device, a feeding device, a regeneration device, a discharging device, a drying device and a calcination device; The pretreatment device, the feeding device, the regeneration device, the discharging device, the drying device and the calcination device are connected in sequence; The pretreatment device is used for disassembling the lithium iron phosphate battery to obtain a positive electrode powder of the lithium iron phosphate battery. The regeneration device is used for regenerating the positive electrode powder poured in through the feeding device to obtain a regenerated lithium iron phosphate positive electrode material. The drying device is used for drying the regenerated lithium iron phosphate positive electrode material discharged through the discharging device. The calcination device is used for pyrolysis calcination of the dried regenerated lithium iron phosphate positive electrode material to obtain a calcined regenerated lithium iron phosphate positive electrode material.

2. The system of claim 1, wherein, The system further comprises a circulating pump; The circulating pump is connected with the regeneration device and the discharging device respectively; The regeneration device stores a regenerated lithium aqueous solution; The circulating pump is used for extracting the regenerated lithium aqueous solution in the discharging device to the regeneration device.

3. The system of claim 2, wherein, The pretreatment device comprises a cutting device, a disassembling device, a low-temperature evaporation device and a dissolving device; The cutting device is used for cutting the lithium iron phosphate battery at both ends to obtain a roll core; The disassembling device is used for disassembling the roll core to obtain a battery separator, a positive electrode material and a negative electrode material; The low-temperature evaporation device is used for low-temperature evaporation of electrolyte of the lithium iron phosphate battery in the disassembling process to realize electrolyte recovery; The dissolving device is used for solvent extraction of the positive electrode material to obtain a positive electrode powder.

4. The system of claim 3, wherein, The feeding device comprises a material valve, a material bin, a feeding port, a conveyor and a sealed port; The sealed port is arranged above the material bin; The material bin is connected with the regeneration device through the conveyor, and the material valve is connected with the material bin.

5. The system of claim 4, wherein, The regeneration device comprises a hydrothermal device, a control device and a stirring device; The hydrothermal device is used for storing an aqueous solution containing regenerated lithium and regenerating the lithium iron phosphate positive electrode material through dissolution recrystallization of hydrothermal reaction; The control device is connected with the hydrothermal device, and the control device is used for monitoring and dynamically adjusting the reaction temperature, pressure and liquid level of the hydrothermal reaction; An opening is arranged above the hydrothermal device, the stirring device is put into the stirring device through the opening, and the stirring device is used for stirring the solution of the hydrothermal device.

6. The system of claim 4, wherein, The regeneration device further comprises a first protection device; The first protection device comprises a pressure relief port and an alarm device; The alarm device is used for alarming when the pressure is higher than a preset pressure threshold or the temperature is greater than a preset temperature threshold; The pressure relief port is used for pressure relief when the pressure is higher than a preset pressure.

7. The system of claim 6, wherein, The discharging device comprises a discharging valve, a discharging port and a receiving pool; The discharging port is arranged at the bottom of the side of the hydrothermal device, the discharging valve is arranged at the discharging port, and the receiving pool is arranged below the discharging port.

8. The system of claim 7, wherein, The discharging device further comprises a discharging pump; The discharging pump is used for extracting the solution in the hydrothermal device.

9. The system of claim 8, wherein, The drying device comprises a material pumping device, a trolley, a conveying device and a dryer; The material pumping device is connected with the material receiving pool and the trolley respectively; The material pumping device is used for pumping the static regenerated lithium iron phosphate positive electrode material; The trolley is used for solid-liquid separation and loading transportation of the pumped regenerated lithium iron phosphate positive electrode material; The conveying device is used for conveying the trolley to the dryer area; The dryer is used for drying treatment of the regenerated lithium iron phosphate positive electrode material.

10. The system of claim 9, wherein, The calcining device comprises a feeding device, a calciner, a second protection device and a discharging device; The feeding device is connected with the calciner, and the calciner is used for pyrolysis calcination treatment of the regenerated lithium iron phosphate positive electrode material sent by the feeding device, to obtain the calcined regenerated lithium iron phosphate positive electrode material; The second protection device is connected with the calciner, and the second protection device is used for providing protection gas for the calciner; The discharging device is used for discharging the calcined regenerated lithium iron phosphate positive electrode material.

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