A lithium iron phosphate material slurry electromagnetic iron remover residual material recovery system
By designing an automated waste material recycling system, the problem of difficult waste material recycling in lithium iron phosphate production has been solved, achieving efficient recycling and reuse of waste material and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YIBIN TIANYUAN NEW LITHIUM BATTERY CO LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-06-26
Smart Images
Figure CN224404967U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of lithium iron phosphate production equipment, and more specifically, to a lithium iron phosphate material slurry electromagnetic iron separator residue recovery system. Background Technology
[0002] Based on the situation in the lithium iron phosphate (LFP) industry, LFP materials generally require a metal particle count content of ≤95 psc / kg in the finished product, and some leading battery cell manufacturers even require a metal particle count content of ≤60 psc / kg in the finished LFP materials. Combined with LFP production process control, the process flow is generally as follows: feeding - homogenization - coarse grinding - fine grinding - slurry iron removal - spray drying - sintering - crushing - sieving for iron removal - packaging. LFP production suppliers typically install electromagnetic iron separators in the wet slurry section to remove metal particles introduced into the production system from the raw materials.
[0003] At present, after each iron removal operation, the magnetic core inside the slurry magnetic separator needs to be rinsed with pure water. Because there is residual material inside the slurry magnetic separator, the normal material discharge (solid content: between 0.2% and 2%) caused by rinsing the magnetic core is difficult to achieve automatic recovery of residual material. At present, the discharge material of the slurry electromagnetic magnetic separator is collected manually, which is simple to operate and inefficient. Utility Model Content
[0004] To address the problems of high collection costs, rudimentary operation, and low efficiency in the current electromagnetic separator cleaning process for slurry, this invention provides a residual material recovery system for lithium iron phosphate slurry electromagnetic separators.
[0005] The embodiments of this utility model are implemented as follows:
[0006] A lithium iron phosphate material slurry electromagnetic iron separator residue recovery system includes a central processing unit and a recovery tank, a first diaphragm pump, a solid-liquid separation component, and a batching tank with a first weighing module connected in sequence. The recovery tank is connected to a recovery pipe, and the batching tank is connected to a first inlet pipe with an inlet valve and a discharge pipe with a second diaphragm pump. The recovery tank is equipped with a first stirring component, and the batching tank is equipped with a second stirring component. The first stirring component, the second stirring component, the first weighing module, the first diaphragm pump, the second diaphragm pump, the solid-liquid separation component, and the inlet valve are all electrically connected to the central processing unit.
[0007] In this embodiment, the residual material (solid content: between 0.2% and 2%) of lithium iron phosphate material slurry electromagnetic separator can be automatically recycled. Approximately 60-130 kg of material can be recycled per ton of product. This method achieves residual material recycling in a relatively simple way, reducing waste and avoiding the labor costs of manual waste disposal, thereby indirectly reducing the overall production cost.
[0008] In some technical solutions of this utility model, the above-mentioned solid-liquid separation component is a plate and frame filter press.
[0009] Plate and frame filter presses offer thorough solid-liquid separation, have a simple structure, and are easy to operate and maintain.
[0010] In some technical solutions of this utility model, the above-mentioned recycling tank is connected to a second water inlet pipe.
[0011] This design is intended to facilitate the cleaning of the recycling tank.
[0012] In some technical solutions of this utility model, the first diaphragm pump is connected to the solid-liquid separation component through a first connecting pipe, the solid-liquid separation component is connected to the mixing tank through a second connecting pipe, and the recovery pipe, the first connecting pipe and the second connecting pipe are all equipped with control valves that are electrically connected to the central processing unit.
[0013] This design approach can further improve the automation level of the waste material recycling system, further reduce the manpower input in the waste material recycling system, and enable more precise control.
[0014] In some technical solutions of this utility model, both the first water inlet pipe and the discharge pipe have a second weighing module that is electrically connected to the central processing unit.
[0015] Since the residual recovery system is connected to the lithium iron phosphate production process, the final material ratio entering the spray tank needs to be precise. This design can control the accuracy of the material moisture ratio to a certain extent.
[0016] In some technical solutions of this utility model, both the first weighing module and the second weighing module are PID weighing modules.
[0017] This design allows for more precise control of the water inlet volume of the first water pipe, thereby controlling the water content of the slurry in the mixing tank.
[0018] In some technical solutions of this utility model, the first stirring assembly includes a first rotating shaft rotatably disposed inside the recycling tank. One end of the first rotating shaft passes through the recycling tank and is connected to a first drive motor electrically connected to the central processing unit. The other end is placed inside the recycling tank and has multiple first stirring blades arranged around its circumference.
[0019] This design prevents solids from accumulating in the recovery tank from the collected liquid waste.
[0020] In some technical solutions of this utility model, the second stirring assembly includes a second rotating shaft rotatably disposed in the ingredient tank. One end of the second rotating shaft passes through the ingredient tank and is connected to a second drive motor electrically connected to the central processing unit. The other end is placed inside the ingredient tank and has multiple second stirring blades arranged around its circumference.
[0021] This design avoids the accumulation of solids in the collected slurry within the mixing tank, thus preventing material sedimentation.
[0022] In summary, the embodiments of this utility model provide a lithium iron phosphate material slurry electromagnetic separator waste recovery system. This system can recover waste from the electromagnetic separator cleaning process. Solid materials are extracted from the waste through a solid-liquid separation component, and water is added to prepare a slurry with the same proportions for the next process, thus achieving waste liquid reuse. Compared to the current manual waste liquid cleaning, this system improves the automation level of waste liquid treatment, enables waste liquid reuse, and can also reduce production costs.
[0023] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects:
[0024] The waste material recovery system is equipped with a sequentially connected recovery tank, a first diaphragm pump, a solid-liquid separation component, and a batching tank with a first weighing module. It also includes a first stirring component, a second stirring component, a central processing unit, a first inlet pipe with an inlet valve, and a discharge pipe with a second diaphragm pump. The system collects the waste liquid from cleaning the electromagnetic separator, recovers the waste material from the waste liquid, and re-mixes it into slurry. This allows the mixed slurry to directly enter the spray drying process, making the operation convenient, avoiding waste of waste material, and saving manpower. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the structure of a lithium iron phosphate material slurry electromagnetic separator residue recovery system in an embodiment of this utility model.
[0027] Icons: 1-Recovery tank, 2-First diaphragm pump, 3-First weighing module, 4-Battery tank, 5-Recovery pipe, 6-Inlet valve, 7-First inlet pipe, 8-Second diaphragm pump, 9-Discharge pipe, 10-First mixing assembly, 11-Second mixing assembly, 12-Plate and frame filter press, 13-Second inlet pipe, 14-First connecting pipe, 15-Second connecting pipe, 16-Second weighing module, 17-First rotating shaft, 18-First drive motor, 19-First mixing blade, 20-Second rotating shaft, 21-Second drive motor, 22-Second mixing blade, 23-Canister to be sprayed, 24-Electromagnetic separator. Detailed Implementation
[0028] Example:
[0029] Please refer to Figure 1 A lithium iron phosphate material slurry electromagnetic iron separator residue recovery system includes a central processing unit and a recovery tank 1, a first diaphragm pump 2, a solid-liquid separation component, and a batching tank 4 with a first weighing module 3 connected in sequence. The recovery tank 1 is connected to a recovery pipe 5, and the batching tank 4 is connected to a first inlet pipe 7 with an inlet valve 6 and a discharge pipe 9 with a second diaphragm pump 8. The recovery tank 1 is equipped with a first stirring component 10, and the batching tank 4 is equipped with a second stirring component 11. The first stirring component 10, the second stirring component 11, the first weighing module 3, the first diaphragm pump 2, the second diaphragm pump 8, the solid-liquid separation component, and the inlet valve 6 are all electrically connected to the central processing unit.
[0030] The principle of this waste material recovery system: The Central Processing Unit (CPU) is the core of a computer system's computation and control, and the final execution unit for information processing and program execution, playing a decisive role in the performance of the computer system. The CPU can directly power the control system in the automated production of lithium iron phosphate, making it more convenient. A solid-liquid separation component can be used for a high-pressure diaphragm filter press; it mainly consists of a frame, filtration section, hydraulic system, unloading device, washing system, tilting plate device, rapping device, and electrical control section. The high-pressure diaphragm filter press uses a hydraulic device as its power unit, equipped with automatic plate pulling and liquid receiving tilting plates, making it simple to operate, easy to maintain, highly automated, and with high filter plate strength. The current lithium iron phosphate production process is: feeding - homogenization - coarse grinding - fine grinding - slurry iron removal - spray drying. - Sintering-Pulverizing-Sieving for Iron Removal-Packaging. This waste material recovery system is connected between the slurry iron removal and spray drying processes. Specifically, the waste material recovery system is connected between the lithium iron phosphate material slurry electromagnetic separator 24 and the spray tank 23. The electromagnetic separator 24 includes a discharge pipe that discharges the waste liquid used to clean the electromagnetic separator 24. The recovery pipe 5 is connected to the discharge pipe of the electromagnetic separator 24. The discharge pipe 9 is connected to the spray tank 23. The slurry in the spray tank 23 will enter the spray drying process. The waste material recovery system is now installed. The recovery pipe 5 is equipped with a waste discharge valve.
[0031] When the waste material recovery system needs to work, its first operation requires adding 2000 kg of pure water to the mixing tank 4. If the waste material recovery system is running continuously, this step can be omitted. That is, if it is used in a cycle, only 2000 kg of pure water needs to be added to the mixing tank 4 again. After the preparation is completed, when the electromagnetic iron separator 24 finishes iron removal and is being rinsed, the discharge valve on the recovery pipe 5 is opened to discharge the cleaning waste liquid from rinsing the electromagnetic iron separator 24 into the recovery tank 1 for collection. When the liquid level in the recovery tank 1 reaches a certain position (preferably reaching 120% of the recovery tank), the central processing unit controls the opening of the first stirring component 10 of the recovery tank 1. When the liquid level (waste liquid from cleaning the electromagnetic separator 24) in the recovery tank 1 reaches 50%, after the first stirring component 10 has been running for 30 minutes, the central processing unit controls the first diaphragm pump 2 to start, delivering slurry to the solid-liquid separation component. The central processing unit then activates the solid-liquid separation component, which filters the material to obtain a solid filter cake, which is then fed into the batching tank 4. The first weighing module 3 in the batching tank 4 monitors the weight of the material in the tank in real time and transmits the information to the central processing unit. When the slurry weight in the batching tank 4 reaches 2500 kg, the central processing unit activates the second stirring component 11 in the batching tank 4. When the slurry weight in the batching tank 4 reaches 3000 kg, the central processing unit opens the inlet valve 6 on the first water inlet pipe 7 connected to the batching tank 4, allowing pure water to enter the batching tank 4. At the same time, the solid-liquid separation component stops delivering the filter cake. When the slurry weight in the recovery batching tank 410 reaches 4000 kg, the central processing unit activates the second diaphragm pump 8 to deliver slurry to the spray tank 23. In this embodiment, the electromagnetic separator for lithium iron phosphate slurry can automatically recover 24 kg of residual material (solid content: between 0.2% and 2%). Approximately 60-130 kg of material can be recovered per ton of product, thus reducing waste and avoiding manual waste disposal. This reduces labor costs and indirectly lowers the overall production cost.
[0032] As a preferred embodiment, the solid-liquid separation component is a plate and frame filter press 12.
[0033] In the above embodiments, the plate and frame filter press 12 is a common solid-liquid separation device, which is widely used in many fields such as chemical, pharmaceutical, food, and environmental protection. It has low filter cake moisture content, thorough solid-liquid separation, simple structure, and convenient operation and maintenance.
[0034] In a preferred embodiment, the aforementioned recycling tank 1 is connected to a second water inlet pipe 13.
[0035] In the above embodiment, the recycling tank 1 includes a drain outlet with a valve. The second water inlet pipe 13 is connected to pure water. When the recycling tank 1 needs to be cleaned, pure water can be introduced into the recycling tank 1 through the second water inlet pipe 13 for cleaning. After cleaning, the valve at the drain outlet is opened to discharge the waste liquid. This design is to facilitate cleaning of the recycling tank 1.
[0036] In a preferred embodiment, the first diaphragm pump 2 is connected to the solid-liquid separation component via a first connecting pipe 14, and the solid-liquid separation component is connected to the mixing tank 4 via a second connecting pipe 15. The recovery pipe 5, the first connecting pipe 14, and the second connecting pipe 15 are all equipped with control valves that are electrically connected to the central processing unit.
[0037] In the above embodiments, the control valve is the core control component of the fluid transport system. It adjusts parameters such as fluid flow rate, pressure, and temperature by changing the size or position of the flow channel, playing a vital role in industrial production. This design can further improve the automation level of the waste material recovery system, further reduce the manpower input in the waste material recovery system, and enable more precise control.
[0038] In a preferred embodiment, both the first water inlet pipe 7 and the discharge pipe 9 have a second weighing module 16 that is electrically connected to the central processing unit.
[0039] In the above embodiment, since the residual recovery system is connected to the lithium iron phosphate production process, the final material ratio entering the spray tank 23 needs to be accurate; it should be noted that the conveying capacity of the discharge pipe 9 is 1000 kg / h.
[0040] As a preferred implementation, both the first weighing module 3 and the second weighing module 16 are PID weighing modules.
[0041] In the above embodiments, the PID weighing module is an automated device that combines a weighing sensor with a PID (proportional-integral-derivative) control algorithm. It is mainly used for the precise measurement and control of material weight in industrial scenarios. By monitoring the weight signal in real time and using the PID algorithm to dynamically adjust the actuator (such as motors, valves, etc.), it can achieve functions such as quantitative feeding and constant weight control. The PID weighing module corresponding to the first weighing module 3 can use the PID algorithm to dynamically adjust the start and stop of the first stirring component 10. The PID weighing modules corresponding to the two second weighing modules 16 use the PID algorithm to dynamically adjust the corresponding pipeline valves. This design can more accurately control the water inlet of the first water pipe, thereby controlling the water content of the slurry in the batching tank 4.
[0042] In a preferred embodiment, the first stirring assembly 10 includes a first rotating shaft 17 rotatably disposed inside the recycling tank 1. One end of the first rotating shaft 17 passes through the recycling tank 1 and is connected to a first drive motor 18 electrically connected to the central processing unit. The other end is placed inside the recycling tank 1 and has multiple first stirring blades 19 arranged around its circumference.
[0043] In the above embodiment, the multiple first stirring blades 19 are divided into two groups. The first group of multiple first stirring blades 19 is circumferentially arranged around the second rotating shaft 20, and the second group of multiple second stirring blades 22 is circumferentially arranged around the second rotating shaft 20. The first and second groups are spaced apart along the axis of the second stirring shaft. The first drive motor 18 is preferably a servo drive motor. The recovery tank 1 is equipped with a liquid level sensor electrically connected to the central processing unit (a liquid level sensor is a device used to detect, measure, and monitor the height, depth, or position of liquid; its core function is to convert liquid level information into electrical signals or other identifiable signals to achieve automated control and safety protection). When the liquid level in the recovery tank 16 reaches 20%, the central processing unit receives the corresponding information and activates the first drive motor 18 in the recovery tank 1. The first drive motor 18 starts, driving the first rotating shaft 17 to rotate, and the first stirring blades 19 stir. At this time, the frequency of the first drive motor 18 is 5Hz. When the liquid level in the recovery tank 1 reaches 50%, the first stirring assembly 10 in the recovery tank 1 is activated at a frequency of 30Hz. Preferably, when slurry needs to be transported to the solid-liquid separation unit, the first stirring component 10 inside the recovery tank 1 starts operating after running at a frequency of 30 Hz for 30 minutes. This design can prevent solid material from the collected liquid waste from settling inside the recovery tank 1.
[0044] In a preferred embodiment, the second stirring assembly 11 includes a second rotating shaft 20 rotatably disposed on the ingredient tank 4. One end of the second rotating shaft 20 passes through the ingredient tank 4 and is connected to a second drive motor 21 electrically connected to the central processing unit. The other end is placed inside the ingredient tank 4 and has multiple second stirring blades 22 arranged around its circumference.
[0045] In the above embodiment, the multiple second stirring blades 22 are divided into two groups. The second stirring blades 22 in the first group are circumferentially arranged around the second rotating shaft 20, and the second stirring blades 22 in the second group are also circumferentially arranged around the second rotating shaft 20. The first and second groups are spaced apart along the axis of the second stirring shaft. A liquid level sensor electrically connected to the central processing unit is also provided in the mixing tank 4. When the liquid level in the mixing tank 4 is lower than 10%, the central processing unit shuts down the second diaphragm pump 8. After 5 minutes, the second stirring assembly 11 in the mixing tank 4 is automatically shut down, that is, the second drive motor 21 is shut down, the second start motor is turned off, the second rotating shaft 20 stops rotating, and the second stirring blades 22 also stop working. This design can prevent solid materials in the collected slurry from depositing in the mixing tank 4, that is, prevent material sedimentation.
[0046] In summary, the embodiments of this utility model provide a residual material recovery system for an electromagnetic separator of lithium iron phosphate material slurry. It can recover the waste material cleaned by the electromagnetic separator 24, and remove the solid material from the waste material through a solid-liquid separation component. Water is added to prepare the same proportion of slurry for the next process, thereby realizing the reuse of waste liquid. Compared with the current manual cleaning of waste liquid, it improves the automation level of waste liquid treatment, realizes the reuse of waste liquid, and can also reduce production costs.
Claims
1. A residual material recovery system for lithium iron phosphate material slurry electromagnetic separator, characterized in that, The system includes a central processing unit and sequentially connected components: a recovery tank (1), a first diaphragm pump (2), a solid-liquid separation assembly, and a batching tank (4) with a first weighing module (3). The recovery tank (1) is connected to a recovery pipe (5), and the batching tank (4) is connected to a first inlet pipe (7) with an inlet valve (6) and a discharge pipe (9) with a second diaphragm pump (8). The recovery tank (1) is equipped with a first stirring assembly (10), and the batching tank (4) is equipped with a second stirring assembly (11). The first stirring assembly (10), the second stirring assembly (11), the first weighing module (3), the first diaphragm pump (2), the second diaphragm pump (8), the solid-liquid separation assembly, and the inlet valve (6) are all electrically connected to the central processing unit.
2. The lithium iron phosphate material slurry electromagnetic separator residue recovery system according to claim 1, characterized in that, The solid-liquid separation component is a plate and frame filter press (12).
3. The lithium iron phosphate material slurry electromagnetic separator residue recovery system according to claim 1 or 2, characterized in that, The recycling tank (1) is connected to a second water inlet pipe (13).
4. The lithium iron phosphate material slurry electromagnetic separator residue recovery system according to claim 1 or 2, characterized in that, The first diaphragm pump (2) is connected to the solid-liquid separation component through the first connecting pipe (14), and the solid-liquid separation component is connected to the mixing tank (4) through the second connecting pipe (15). The recovery pipe (5), the first connecting pipe (14) and the second connecting pipe (15) are all equipped with control valves that are electrically connected to the central processing unit.
5. The lithium iron phosphate material slurry electromagnetic separator residue recovery system according to claim 1, characterized in that, Both the first water inlet pipe (7) and the discharge pipe (9) have a second weighing module (16) that is electrically connected to the central processing unit.
6. The lithium iron phosphate material slurry electromagnetic separator residue recovery system according to claim 5, characterized in that, Both the first weighing module (3) and the second weighing module (16) are PID weighing modules.
7. The lithium iron phosphate material slurry electromagnetic separator residue recovery system according to claim 1, characterized in that, The first stirring assembly (10) includes a first rotating shaft (17) rotatably disposed inside the recycling tank (1). One end of the first rotating shaft (17) passes through the recycling tank (1) and is connected to a first drive motor (18) electrically connected to the central processing unit. The other end is placed inside the recycling tank (1) and has multiple first stirring blades (19) arranged around its circumference.
8. The lithium iron phosphate material slurry electromagnetic separator residue recovery system according to claim 1, characterized in that, The second stirring assembly (11) includes a second rotating shaft (20) rotatably disposed in the mixing tank (4). One end of the second rotating shaft (20) passes through the mixing tank (4) and is connected to a second drive motor (21) electrically connected to the central processing unit. The other end is placed inside the mixing tank (4) and has multiple second stirring blades (22) arranged around its side.