Iron phosphate high magnetic material demagnetization recovery device

Abstract

The utility model discloses a kind of high-magnetic iron phosphate material demagnetization recovery devices, including iron-removal tank and the demagnetizer being connected between the upper and lower ends of iron-removal tank, the iron-removal tank at least two be provided, iron-removal tank connection is pumped into the circulating pump of demagnetizer or beating pulp tank, at least two demagnetizers are connected between each iron-removal tank upper and lower end and are connected in parallel, the switch valve is arranged between the circulating pump and each demagnetizer and beating pulp tank connected with it. By setting parallel demagnetizer, each demagnetizer in it is controlled separately to clean in the process of circulating demagnetization, ensure that demagnetization efficiency and demagnetization effect;Parallel demagnetization groove is set, concentrate a period of time continuously income and invest in production, facilitate product traceability and quality management;Material after demagnetization does not need temporary storage, avoid foreign matter to enter again while also save production investment cost;Demagnetization groove feed inlet is set grid fence and demagnetization bar and carries out primary screening, further ensure that demagnetization effect.

Description

Technical Field

[0001] This utility model relates to a magnetic material recycling device, and more particularly to a demagnetization and recycling device for high magnetic materials such as iron phosphate. Background Technology

[0002] Lithium iron phosphate (LFP), as a core electrode material in the new energy field, has been widely used in new energy vehicle power batteries, large-scale energy storage power stations, and portable electronic device power supplies due to its outstanding characteristics such as excellent safety, long cycle life, low cost, and environmental friendliness. It has become one of the key materials driving the global energy structure towards a cleaner future. With the explosive growth of the global new energy vehicle industry and the rapid expansion of the energy storage industry under the "dual carbon" goal, the market demand for LFP has grown exponentially, leading to a sharp increase in the demand for its raw materials. To meet the market demand for high-quality LFP products, the production process adopts an automated control system, significantly improving production efficiency and effectively alleviating market supply pressure. However, behind the pursuit of high-efficiency production, the high-frequency operation of equipment, high-precision screening and interception, and increased system cleaning requirements in the continuous production process inevitably generate a certain amount of waste. For example, coarse particles intercepted during continuous screening and residual slurry from equipment switching or shutdown cleaning become the main components of high-magnetic waste in LFP production. The core problem with this type of material is that its magnetic content exceeds the standard, making it unsuitable for direct use in lithium iron phosphate production. If it is not recycled, it will not only occupy a large amount of industrial storage space but also require additional environmental treatment costs. Direct disposal, on the other hand, will result in a serious waste of lithium iron phosphate raw materials, increasing production costs. The invention patent with publication number CN120039842A discloses a dissolution-reprecipitation process for treatment. While this process can regenerate magnetic materials, it requires the addition of phosphoric acid as an auxiliary material during production, resulting in high energy consumption and a long process chain. The utility model patent with announcement number CN220759550U discloses a battery slurry demagnetization and recycling system. By setting a slurry storage device at the bottom of the demagnetizer for temporary storage of slurry during permanent magnet cleaning to avoid waste, the cleaning of the demagnetizer still requires shutdown and cannot continuously demagnetize and recycle materials. Therefore, it cannot be directly and continuously put into production. The recycled materials still need to be temporarily stored and reused at a suitable time, which increases the space and cost requirements for temporary storage and also increases the risk of secondary pollution. In addition, the inability to centrally recycle and reuse the materials is not conducive to production line management, product traceability and quality control. Utility Model Content

[0003] Purpose of the utility model: The purpose of this utility model is to provide a demagnetization and recycling device for high magnetic materials of iron phosphate in order to improve the efficiency of recycling and reuse of high magnetic materials in production lines.

[0004] Technical solution: The iron phosphate high magnetic material demagnetization and recovery device of this utility model includes an iron removal tank and a demagnetizer connected between the upper and lower ends of the iron removal tank. At least two iron removal tanks are provided. The iron removal tank is connected to a circulation pump that pumps the slurry into the demagnetizer or the slurry tank. At least two demagnetizers are connected in parallel between the upper and lower ends of each iron removal tank. A switch valve is provided between the circulation pump and each demagnetizer and the slurry tank connected to it.

[0005] Furthermore, the iron removal tank is equipped with a sampling port for detecting the demagnetization efficiency. The sampling port is located near the lower middle end of the iron removal tank and away from the return valve inlet, so that the sample can better reflect the magnetic content of the slurry inside the iron removal tank.

[0006] Furthermore, the feed inlet of the iron removal trough is equipped with a mesh screen for preliminary screening of large foreign objects. The mesh screen is evenly arranged with multiple demagnetizing rods to intercept larger foreign objects such as clumps of ferric phosphate and metal shavings from equipment wear.

[0007] Furthermore, the mesh grille has square openings with a diameter of 2-3 cm. This is because high-magnetic waste often contains a significant number of rod-shaped or irregularly shaped large foreign objects, and appropriately sized square openings are more effective at intercepting larger objects.

[0008] Furthermore, a pure water inlet valve is installed at the top of the iron removal tank, and an appropriate amount of pure water is pumped in to make the highly magnetic material into a slurry for the circulating demagnetization process.

[0009] Furthermore, the iron removal tank is equipped with a solids content detector for detecting the content of high magnetic materials in the slurry. The solids content is between 10% and 15%, and a slurry with a suitable concentration is beneficial for the removal of magnetic substances.

[0010] Furthermore, the iron removal tank is equipped with a stirring device for mixing high magnetic materials into a uniform slurry, which improves the uniformity of slurry mixing in the tank, prevents magnetic substances from accumulating at the bottom of the tank and interfering with the accuracy of the demagnetization test results, and ensures the quality of the slurry pumped into the slurry tank.

[0011] Furthermore, the pulping tank is equipped with a level gauge to control the amount of recycled material pumped in. The volume of the pulping tank is determined by controlling the amount of recycled slurry pumped into each tank through the level gauge. Normal material is then pumped in through the inlet to control the low proportion of recycled slurry blending at 5%-15%.

[0012] Beneficial effects: Compared with the prior art, this utility model has the following advantages: 1. By setting up parallel demagnetizers, each demagnetizer is individually controlled for cleaning during the cyclic demagnetization process, ensuring demagnetization efficiency and effect; 2. Setting up parallel demagnetization tanks allows for continuous intake and production over a concentrated period, facilitating product traceability and quality management; 3. Demagnetized materials do not require temporary storage, preventing foreign objects from re-entering and saving production input costs; 4. The feed inlet of the demagnetization tank is equipped with a mesh grid and demagnetizing rods for initial screening, further ensuring the demagnetization effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0014] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0015] like Figure 1 The device for demagnetizing and recovering high-magnetic iron phosphate material shown includes two parallel iron removal tanks 9. Two demagnetizers 6 are arranged parallel to each other between the upper and lower ends of each iron removal tank 9. A circulation pump 5 is connected to the bottom of each iron removal tank 9 to pump the slurry into the demagnetizer 6 or the pulping tank 11. Each circulation pump 5 has an independently controlled switch valve connected to each demagnetizer 6 and the pulping tank 11. The inlet of the iron removal tank 9 is equipped with a mesh screen 3 for preliminary screening to remove large foreign objects. Multiple demagnetizing rods 2 are evenly arranged on the mesh screen 3, and the mesh screen 3 has square holes with a diameter of 2-3 cm. A pure water inlet valve 10 is installed at the top of the iron removal tank 9. Inside, there is a stirring device 1 for mixing the high-magnetic material with pure water to form a uniform slurry, a solid content analyzer 4 for detecting the high-magnetic material content in the slurry, and a sampling port 14 for detecting the demagnetization efficiency. After passing the demagnetization test, the slurry is pumped into the pulping tank 11 by the circulation pump 5. The amount of recycled material pumped in is controlled by the level gauge 15, and the ratio of recycled material to normal material is controlled. After being mixed evenly, it is pumped into the next process.

[0016] The method for recycling highly magnetic materials and reusing them in production using the above-mentioned recycling device includes the following steps:

[0017] (S1) The pure water inlet valves 10 at the top of the two iron removal tanks 9 are activated one after another to inject a certain amount of pure water into them. The stirring device 1 inside the iron removal tank 9 is turned on. The waste bag is clamped by the mechanical arm and hoisted to the top of the feed inlet of the iron removal tank 9 for vertical feeding.

[0018] (S2) During the fall of the waste, it first passes through the grid 3 and the demagnetizing rod 2 for pre-screening, so that larger foreign objects such as larger lumps of iron phosphate and metal scraps from equipment wear are intercepted. The pre-treated waste falls into the iron removal tank 9.

[0019] (S3) The concentration data of the mixed slurry in the iron removal tank 9 is collected in real time by the online solid content detector 4 to ensure that the solid content is between 10% and 15%;

[0020] (S4) Start the circulation pump 5, open the inlet valve 8 and return valve 7 on the iron removal tank 9 and the demagnetizing feed valve 13 at the front end of each demagnetizer 6, and close the recovery feed valve 12 at the bottom of the slurry tank 11. Pump the mixed slurry into the demagnetizer 6 for demagnetization treatment, and then flow back to the iron removal tank 9 through the return valve 7. During the circulation process, the opening and closing of the demagnetizing feed valve 13 at the front end of each demagnetizer 6 is controlled individually. The magnetic material adsorbed on the surface of the magnetic rod inside each demagnetizer 6 can be cleaned in sequence without stopping the machine, so as to ensure the demagnetization efficiency.

[0021] (S5) After a period of cyclic demagnetization, the slurry inside the iron removal tank 9 is extracted through the sampling port 14. The magnetic material content is ≤200pcs / kg, which meets the qualified standard. Then, the cyclic demagnetization is stopped.

[0022] (S6) Close the demagnetizing feed valve 13 at the front end of the demagnetizer 6 and the return valve 7 of the iron removal tank 9, open the recovery material feed valve 12 at the bottom of the pulping tank 11, pump the demagnetized slurry into the pulping tank 11 through the circulation pump 5, control the pumping amount of recovery slurry in each tank through the level gauge 15, and then pump in normal material through the inlet to control the low proportion of 5%-15% of the recovery slurry.

[0023] (S7) Start the stirring device in the pulping tank 11, mix evenly, and then transport to the filter press.

[0024] Through the above-mentioned recycling device and recycling method, the high magnetic materials generated by the production line can be centrally recycled and processed, and centrally put into production. There is no need for temporary storage in transfer equipment. The recycled materials can be centrally and continuously put into production, and the products can be accurately traced, which facilitates product quality control.

Claims

1. A demagnetization and recovery device for high-magnetic iron phosphate materials, comprising an iron removal tank (9) and a demagnetizer (6) connected between the upper and lower ends of the iron removal tank (9), characterized in that, At least two iron removal troughs (9) are provided. The iron removal troughs (9) are connected to a circulating pump (5) that pumps the slurry into the demagnetizer (6) or the slurry tank (11). At least two demagnetizers (6) are connected in parallel between the upper and lower ends of each iron removal trough (9). A switching valve is provided between the circulating pump (5) and each demagnetizer (6) and the slurry tank (11) it is connected to.

2. The demagnetization and recovery device for high-magnetic iron phosphate materials according to claim 1, characterized in that, The iron removal trough (9) is equipped with a sampling port (14) for detecting the demagnetization efficiency.

3. The demagnetization and recovery device for high-magnetic iron phosphate materials according to claim 1, characterized in that, The feed inlet of the iron removal trough (9) is equipped with a mesh grid (3) for preliminary screening of large foreign objects, and multiple demagnetizing rods (2) are evenly arranged in the mesh grid (3).

4. The demagnetization and recovery device for high-magnetic iron phosphate materials according to claim 3, characterized in that, The mesh fence (3) has square holes.

5. The demagnetization and recovery device for high-magnetic iron phosphate materials according to claim 4, characterized in that, The square aperture diameter of the mesh fence (3) is 2-3 cm.

6. The demagnetization and recovery device for high-magnetic iron phosphate materials according to claim 1, characterized in that, A pure water inlet valve (10) is provided at the top of the iron removal tank (9).

7. The demagnetization and recovery device for high-magnetic iron phosphate materials according to claim 1, characterized in that, The iron removal tank (9) is equipped with a solid content detector (4) for detecting the content of high magnetic materials in the slurry.

8. The demagnetization and recovery device for high-magnetic iron phosphate materials according to claim 1, characterized in that, The iron removal tank (9) is equipped with a stirring device (1) for mixing high magnetic materials into a uniform slurry.

9. The demagnetization and recovery device for high-magnetic iron phosphate materials according to claim 1, characterized in that, The pulping tank (11) is equipped with a level gauge (15) for controlling the amount of recycled material pumped in.

Images