Demagnetizing device for iron phosphate

Abstract

The utility model discloses a demagnetizing device for iron phosphate. The demagnetizing device comprises a barrel body, a powder feeding hole and a liquid phase feeding hole are formed in the top end of the barrel body; a first demagnetizing piece and a second demagnetizing piece are sequentially arranged on the barrel body; the first demagnetizing piece is communicated with the powder feeding hole; the second demagnetizing piece is arranged on the inner wall of the barrel body; and a stirring assembly is arranged in the barrel body. The device has the advantages of dry demagnetization and wet demagnetization, good demagnetization effect, high demagnetization efficiency, simple structure and low cost, and is beneficial to industrial production and application.

Description

Technical Field

[0001] This utility model relates to the field of demagnetization technology, and in particular to a demagnetizing device for iron phosphate. Background Technology

[0002] Lithium iron phosphate batteries are widely used in the new energy battery industry due to their advantages such as good safety and low cost. Safety performance is a key indicator of lithium batteries, and magnetic impurities in lithium batteries may cause internal short circuits during charging and discharging, posing a safety hazard. Furthermore, magnetic materials in lithium batteries can also adversely affect their self-discharge rate, energy density, and battery life.

[0003] Iron phosphate is a precursor for the cathode material of lithium iron phosphate batteries, and controlling the magnetic content is a crucial step. During the production of iron phosphate, demagnetization is performed at each stage to ensure that the magnetic content in the product meets standards. Traditionally, demagnetization of iron phosphate involves bringing the material into contact with a demagnetizer during transport. However, because the material is a powder or particle that easily clumps together and flows at a relatively high speed, it fails to make sufficient and uniform contact with the demagnetizer, resulting in poor demagnetization effect and low efficiency. Utility Model Content

[0004] In view of this, this application aims to at least partially solve the problems in the related technology. The purpose of this application is to provide a demagnetizing device for ferric phosphate, comprising: a barrel; a powder inlet and a liquid inlet are provided at the top of the barrel; a first demagnetizing component and a second demagnetizing component are sequentially provided on the barrel; the first demagnetizing component is connected to the powder inlet; the second demagnetizing component is provided on the inner wall of the barrel; and a stirring assembly is provided inside the barrel.

[0005] During the demagnetization operation, ferric phosphate powder enters the tank through the powder inlet. Upon contact with the first demagnetizing element, the magnetic substances in the material are adsorbed, performing primary demagnetization. Solvent (water or dilute acid) is then injected into the tank through the liquid inlet. The mixture is then stirred for 10-20 minutes to thoroughly mix the material and water, forming a slurry. During this stirring process, the magnetic substances in the material are adsorbed by a second demagnetizing element on the inner wall of the tank, performing secondary demagnetization. The added solvent during stirring dissolves the magnetic substances and increases the material's fluidity. When processing highly magnetic ferric phosphate, a dilute acid solution can be used to mix with the material, removing some of the magnetic substances through dissolution. If water is used as the solvent, the slurry after secondary demagnetization can be filtered, and the filter cake can be fed back into the powder inlet to repeat the demagnetization process, improving the demagnetization effect. This invention combines dry and wet demagnetization, offering good demagnetization effect and high efficiency. The device has a simple structure, low cost, and is suitable for industrial production applications.

[0006] In a preferred embodiment of this invention, the first demagnetizing component includes: a pipeline demagnetizer; the pipeline demagnetizer has several magnetic rods disposed inside; the input end of the pipeline demagnetizer is connected to the powder feed inlet; and the output end of the pipeline demagnetizer is connected to the inner cavity of the barrel.

[0007] Specifically, the pipeline demagnetizer is a permanent magnet demagnetizer, which is uniformly filled with multiple high-strength magnetic rods inside. It can attract magnetic substances in the material and adsorb most of the magnetic substances inside the pipeline demagnetizer. After being demagnetized by the pipeline demagnetizer, the magnetic substances contained in the material are greatly reduced.

[0008] In a preferred embodiment of this invention, the input end of the pipeline demagnetizer is connected to a vacuum feeder; the powder inlet is located on the side wall of the vacuum feeder; a vacuum pump is installed on the vacuum feeder; and the vacuum feeder is connected to the inner cavity of the barrel.

[0009] Vacuum feeders utilize a vacuum pump to create a low-pressure environment within the feed hopper. The pressure difference with the outside environment is used to feed materials. The material enters the vacuum feeder through the powder inlet, then undergoes a first demagnetization in the pipeline demagnetizer, and finally a second demagnetization in the inner cavity. The entire process involves sealed powder transport, preventing material contamination. Vacuum feeders also reduce manual labor intensity and improve work efficiency.

[0010] In a preferred embodiment of this invention, the output end of the vacuum feeder is provided with a feeder; one end of the feeder is connected to the vacuum feeder; and the other end of the feeder is connected to the pipeline demagnetizer.

[0011] Specifically, the feeder is preferably a single-tube screw feeder, which facilitates the metering and control of powdery materials. The single-tube screw feeder uses a closed conveying system, and when combined with a vacuum feeder, it has good sealing performance, which can avoid dust pollution to the environment and ensure stable feeding.

[0012] In a preferred embodiment of this invention, the second demagnetizing component includes a plurality of magnetic strips; the magnetic strips are disposed on the inner wall near the bottom of the barrel.

[0013] Specifically, after the solvent enters the tank through the liquid phase inlet, it mixes with the material to form a solution. In the solution, substances of equal volume experience the same buoyancy. However, substances with lower density experience a smaller difference between the buoyancy and their own weight, making it easier for them to maintain their position or float. Substances with higher density experience a larger difference between the buoyancy and their own weight, making them easier to sink. Because the density of the magnetic material in the material is greater than that of the iron phosphate powder, it easily sinks to the bottom of the tank wall and is attracted by the magnetic strips. The material undergoes secondary demagnetization, thus thoroughly removing the magnetic material. In practice, a discharge port can be set at the bottom of the tank, and a discharge pump can be placed near the discharge port. After demagnetization, the iron phosphate slurry is transported from the discharge port to the separation equipment for solid-liquid separation, followed by drying and dehydration to obtain demagnetized iron phosphate powder.

[0014] The inner wall of the barrel is preferably made of glass fiber reinforced plastic. The inner wall of the barrel made of glass fiber reinforced plastic has a certain mechanical strength, is lightweight and corrosion resistant, and will not adversely affect the demagnetization of the magnetic strip.

[0015] In a preferred embodiment of this invention, a magnetic groove cover is fitted onto the magnetic strip; the magnetic groove cover is disposed on the inner wall near the bottom of the barrel; a buckle is provided at the outlet end of the magnetic groove cover; the buckle passes through the barrel and connects to the magnetic groove cover.

[0016] When the magnetic material on the magnetic strip needs to be collected or cleaned, simply release the latch and remove the magnetic strip directly from the magnetic groove cover for quick and easy collection or cleaning. In practice, depending on the specific situation, the latch can be designed as a detachable or clasp-type structure to facilitate the removal of the magnetic strip from the barrel cavity.

[0017] In a preferred embodiment of this invention, the included angle between any two magnetic strips on the same plane is 120°; every three magnetic strips on the same plane form a magnetic group, and a total of M magnetic groups are provided at different heights on the inner wall of the barrel; where M is an integer greater than 0.

[0018] Setting multiple magnetic groups distributed at different heights inside the barrel helps improve the adsorption efficiency and demagnetization effect of magnetic materials. When the barrel is cylindrical, the three magnetic strips on the same plane are evenly distributed and arranged in a circular array, which helps to improve the adsorption efficiency of magnetic materials.

[0019] In a preferred embodiment of this invention, a tetrafluoroethylene sleeve is fitted onto the magnetic strip.

[0020] PTFE tubing, also known as polytetrafluoroethylene tubing, has extremely high corrosion resistance and can be used in extreme environments such as strong acids, strong alkalis, and strong oxidants. It can prevent the magnetic strip from being corroded, and at the same time, it is easy to remove the tubing to collect the magnetic material adsorbed on it.

[0021] In a preferred embodiment of this invention, M baffles are provided on the inner wall of the barrel; M is an integer greater than 0.

[0022] M baffles are installed on the inner wall of the barrel. The baffles are inclined downwards at a certain angle relative to the barrel wall. When the liquid flows, it will come into contact with the baffles. The inclined baffles can change the flow direction of the liquid. The liquid in the vicinity will be blocked by them and thus change its flow direction, avoiding the liquid in the inner cavity of the barrel being in a horizontal state, enhancing the stirring effect, and making the material and liquid solution quickly and evenly mixed, preventing the iron phosphate powder from clumping and settling at the bottom of the barrel.

[0023] In a preferred embodiment of this invention, the stirring assembly includes a stirring paddle and a stirring motor; the stirring paddle is electrically connected to the stirring motor; and the stirring paddle is disposed inside the barrel.

[0024] Specifically, the stirring paddle has one or more layers to ensure that the material is mixed thoroughly and quickly with the liquid solution, preventing the iron phosphate powder from clumping together and settling at the bottom of the container.

[0025] Compared with the prior art, the above-mentioned technical solution provided in this application has the following advantages: In the demagnetizing device for ferric phosphate of this application, during the demagnetizing operation, ferric phosphate powder enters the tank from the powder inlet. After the material comes into contact with the first demagnetizing element, the magnetic substances in the material are adsorbed by the first demagnetizing element, performing a first demagnetization. A solvent (water or dilute acid) is injected into the tank from the liquid phase inlet, and then the stirring assembly is used to stir for 10-20 minutes, allowing the material and water to be fully mixed to form a slurry. During the stirring process, the magnetic substances in the material are adsorbed by a second demagnetizing element on the inner wall of the tank for a second demagnetization. During stirring in the tank, the added solvent can dissolve the magnetic substances and increase the fluidity of the material. When processing ferric phosphate with high magnetic properties, a dilute acid solution can be used to mix with the material, and the dilute acid solution can remove some of the magnetic substances by dissolving them. If water is used as the solvent, the slurry after the second demagnetization can be separated by pressure filtration, and the filter cake can be fed into the powder inlet to repeat the above demagnetizing operation, improving the demagnetizing effect. This invention combines dry and wet demagnetization, resulting in good demagnetization effect and high demagnetization efficiency. The device has a simple structure, low cost, and is suitable for industrial production applications. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] In the attached image:

[0029] Figure 1 This is a schematic diagram of a demagnetizing device for iron phosphate according to this application;

[0030] Figure 2 This is a schematic diagram of the magnetic stripe position according to this application;

[0031] Figure 3 This is a schematic diagram of a second demagnetizing element in this application.

[0032] Figure label:

[0033] 11. Powder inlet; 111. Vacuum feeder; 112. Vacuum pump; 113. Feeder; 12. Liquid inlet; 21. Stirring motor; 22. Stirring paddle; 23. Inner cavity; 24. Baffle plate; 31. Pipe demagnetizer; 32. Magnetic strip; 321. Magnetic groove cover; 322. Buckle; 41. Discharge port; 411. Discharge pump. Detailed Implementation

[0034] To provide a clearer understanding of the technical features, objectives, and effects of this application, the specific embodiments of this application are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the mechanism or element referred to must have a specific orientation; therefore, they should not be construed as limitations on this application.

[0035] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, that component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0036] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, mechanisms, circuits, and methods are omitted so as not to obscure the description of this application with unnecessary detail.

[0037] Example 1

[0038] like Figures 1-3 As shown, this embodiment provides a demagnetizing device for ferric phosphate, comprising: a barrel; a powder inlet 11 and a liquid inlet 12 are provided at the top of the barrel; a first demagnetizing component and a second demagnetizing component are sequentially provided on the barrel; the first demagnetizing component is connected to the powder inlet 11; the second demagnetizing component is provided on the inner wall of the barrel; and a stirring assembly is provided inside the barrel.

[0039] During the demagnetization operation, ferric phosphate powder enters the tank through the powder inlet 11. Upon contact with the first demagnetizing element, the magnetic substances in the material are adsorbed, performing a primary demagnetization. A solvent (water or dilute acid) is then injected into the tank through the liquid inlet 12, and the mixture is stirred for 10-20 minutes to thoroughly mix the material and water, forming a slurry. During this stirring process, the magnetic substances in the material are adsorbed by a second demagnetizing element on the inner wall of the tank, resulting in a secondary demagnetization. The solvent added during stirring dissolves the magnetic substances and increases the material's fluidity. When processing ferric phosphate with high magnetic properties, a dilute acid solution can be mixed with the material, removing some of the magnetic substances through dissolution. If water is used as the solvent, the slurry after secondary demagnetization can be filtered, and the filter cake can be fed back into the powder inlet 11 to repeat the demagnetization operation, improving the demagnetization effect. This invention combines dry and wet demagnetization, resulting in good demagnetization effect and high demagnetization efficiency. The device has a simple structure, low cost, and is suitable for industrial production applications.

[0040] Optionally, the first demagnetizing component includes: a pipeline demagnetizer 31; the pipeline demagnetizer 31 has several magnetic rods inside; the input end of the pipeline demagnetizer 31 is connected to the powder feed inlet 11; and the output end of the pipeline demagnetizer 31 is connected to the inner cavity 23 of the barrel.

[0041] Specifically, the pipeline demagnetizer 31 is a permanent magnet demagnetizer, which is uniformly filled with multiple high-strength magnetic rods inside. It can attract magnetic substances in the material and adsorb most of the magnetic substances inside the pipeline demagnetizer 31. After being demagnetized by the pipeline demagnetizer 31, the magnetic substances contained in the material are greatly reduced.

[0042] Optionally, the input end of the pipeline demagnetizer 31 is connected to a vacuum feeder 111; the powder inlet 11 is located on the side wall of the vacuum feeder 111; a vacuum pump 112 is installed on the vacuum feeder 111; and the vacuum feeder 111 is connected to the inner cavity 23 of the barrel.

[0043] The vacuum feeder 111 utilizes a vacuum pump 112 to create a low-pressure environment within its hopper. The pressure difference with the outside environment is used to feed the material. The material enters the vacuum feeder 111 through the powder inlet 11, then enters the pipeline demagnetizer 31 for initial demagnetization, and finally enters the inner cavity 23 for secondary demagnetization. The entire process involves sealed powder transport, preventing material contamination. The vacuum feeder 111 also reduces manual labor intensity and improves work efficiency.

[0044] Optionally, the output end of the vacuum feeder 111 is provided with a feeder 113; one end of the feeder 113 is connected to the vacuum feeder 111; the other end of the feeder 113 is connected to the pipeline demagnetizer 31.

[0045] Specifically, the feeder 113 is preferably a single-tube screw feeder 113, which facilitates the metering and control of powdery materials. The single-tube screw feeder uses a closed conveying system for materials, and when combined with the vacuum feeder 111, it has good sealing performance, which can avoid dust pollution to the environment and ensure stable feeding.

[0046] Example 2

[0047] like Figures 1-3 As shown, this embodiment provides a demagnetizing device for ferric phosphate, comprising: a barrel; a powder inlet 11 and a liquid inlet 12 are provided at the top of the barrel; a first demagnetizing component and a second demagnetizing component are sequentially provided on the barrel; the first demagnetizing component is connected to the powder inlet 11; the second demagnetizing component is provided on the inner wall of the barrel; and a stirring assembly is provided inside the barrel.

[0048] During the demagnetization operation, ferric phosphate powder enters the tank through the powder inlet 11. Upon contact with the first demagnetizing element, the magnetic substances in the material are adsorbed, performing a primary demagnetization. A solvent (water or dilute acid) is then injected into the tank through the liquid inlet 12, and the mixture is stirred for 10-20 minutes to thoroughly mix the material and water, forming a slurry. During this stirring process, the magnetic substances in the material are adsorbed by a second demagnetizing element on the inner wall of the tank, resulting in a secondary demagnetization. The solvent added during stirring dissolves the magnetic substances and increases the material's fluidity. When processing ferric phosphate with high magnetic properties, a dilute acid solution can be mixed with the material, removing some of the magnetic substances through dissolution. If water is used as the solvent, the slurry after secondary demagnetization can be filtered, and the filter cake can be fed back into the powder inlet 11 to repeat the demagnetization operation, improving the demagnetization effect. This invention combines dry and wet demagnetization, resulting in good demagnetization effect and high demagnetization efficiency. The device has a simple structure, low cost, and is suitable for industrial production applications.

[0049] Optionally, the second demagnetizing component includes: a plurality of magnetic strips 32; the magnetic strips 32 are disposed on the inner wall near the bottom of the barrel.

[0050] Specifically, after the solvent enters the tank through the liquid inlet 12, it mixes with the material to form a solution. In the solution, substances of the same volume experience the same buoyancy. However, substances with lower density experience a smaller difference between the buoyancy and their own weight, making it easier for them to maintain their position or float. Substances with higher density experience a larger difference between the buoyancy and their own weight, making them easier to sink. Since the density of the magnetic material in the material is greater than that of the iron phosphate powder, it easily sinks to the bottom of the tank wall and is attracted by the magnetic strip 32, thus undergoing secondary demagnetization and thoroughly removing the magnetic material. In practice, an outlet 41 can be set at the bottom of the tank, and a discharge pump 411 can be set near the outlet 41. After demagnetization, the iron phosphate slurry is transported by the discharge pump 411 from the outlet 41 to the separation equipment for solid-liquid separation, followed by drying and dehydration to obtain demagnetized iron phosphate powder.

[0051] The inner cavity 23 of the barrel is preferably made of glass fiber reinforced plastic. The inner cavity 23 of the barrel made of glass fiber reinforced plastic has a certain mechanical strength, is lightweight and corrosion resistant, and will not adversely affect the demagnetization of the magnetic strip 32.

[0052] Optionally, a magnetic groove cover 321 is fitted onto the magnetic strip 32; the magnetic groove cover 321 is disposed on the inner wall near the bottom of the barrel; a buckle 322 is provided at the outlet end of the magnetic groove cover 321; the buckle 322 passes through the barrel and is connected to the magnetic groove cover 321.

[0053] When the magnetic material on the magnetic strip 32 needs to be collected or cleaned, the buckle 322 can be released, and the magnetic strip 32 can be directly removed from the magnetic groove cover 321 for convenient and quick collection or cleaning of the magnetic material on the magnetic strip 32. In practice, depending on the specific situation, the buckle 322 can be designed as a detachable or clasp-type structure to facilitate the removal of the magnetic strip 32 from the barrel cavity.

[0054] Optionally, the included angle between any two magnetic strips 32 on the same plane is 120°; every three magnetic strips 32 on the same plane form a group of magnetic groups 32, and a total of M groups of magnetic groups 32 are set at different heights on the inner wall of the barrel; where M is an integer greater than 0.

[0055] In this embodiment, six magnetic strips are arranged in two groups. Multiple magnetic groups 32 are distributed at different heights inside the barrel, which helps to improve the adsorption efficiency and demagnetization effect of magnetic materials. Figure 2 As shown, when the barrel is cylindrical, the three magnetic strips 32 on the same plane are evenly distributed and arranged in a circular array, which is beneficial to improving the adsorption efficiency of magnetic materials.

[0056] Optionally, the magnetic strip 32 is fitted with a tetrafluoroethylene sleeve.

[0057] The PTFE sleeve, also known as polytetrafluoroethylene tubing, has extremely high corrosion resistance and can be used in extreme environments such as strong acids, strong alkalis, and strong oxidants. It can prevent the magnetic strip 32 from being corroded, and at the same time, it is easy to remove the sleeve to collect the magnetic material adsorbed on the sleeve.

[0058] Example 3

[0059] like Figures 1-3 As shown, this embodiment provides a demagnetizing device for ferric phosphate, comprising: a barrel; a powder inlet 11 and a liquid inlet 12 are provided at the top of the barrel; a first demagnetizing component and a second demagnetizing component are sequentially provided on the barrel; the first demagnetizing component is connected to the powder inlet 11; the second demagnetizing component is provided on the inner wall of the barrel; and a stirring assembly is provided inside the barrel.

[0060] During the demagnetization operation, ferric phosphate powder enters the tank through the powder inlet 11. Upon contact with the first demagnetizing element, the magnetic substances in the material are adsorbed, performing a primary demagnetization. A solvent (water or dilute acid) is then injected into the tank through the liquid inlet 12, and the mixture is stirred for 10-20 minutes to thoroughly mix the material and water, forming a slurry. During this stirring process, the magnetic substances in the material are adsorbed by a second demagnetizing element on the inner wall of the tank, resulting in a secondary demagnetization. The solvent added during stirring dissolves the magnetic substances and increases the material's fluidity. When processing ferric phosphate with high magnetic properties, a dilute acid solution can be mixed with the material, removing some of the magnetic substances through dissolution. If water is used as the solvent, the slurry after secondary demagnetization can be filtered, and the filter cake can be fed back into the powder inlet 11 to repeat the demagnetization operation, improving the demagnetization effect. This invention combines dry and wet demagnetization, resulting in good demagnetization effect and high demagnetization efficiency. The device has a simple structure, low cost, and is suitable for industrial production applications.

[0061] Optionally, the first demagnetizing component includes: a pipeline demagnetizer 31; the pipeline demagnetizer 31 has several magnetic rods inside; the input end of the pipeline demagnetizer 31 is connected to the powder feed inlet 11; and the output end of the pipeline demagnetizer 31 is connected to the inner cavity 23 of the barrel.

[0062] Specifically, the pipeline demagnetizer 31 is a permanent magnet demagnetizer, which is uniformly filled with multiple high-strength magnetic rods inside. It can attract magnetic substances in the material and adsorb most of the magnetic substances inside the pipeline demagnetizer 31. After being demagnetized by the pipeline demagnetizer 31, the magnetic substances contained in the material are greatly reduced.

[0063] Optionally, the input end of the pipeline demagnetizer 31 is connected to a vacuum feeder 111; the powder inlet 11 is located on the side wall of the vacuum feeder 111; a vacuum pump 112 is installed on the vacuum feeder 111; and the vacuum feeder 111 is connected to the inner cavity 23 of the barrel.

[0064] The vacuum feeder 111 utilizes a vacuum pump 112 to create a low-pressure environment within its hopper. The pressure difference with the outside environment is used to feed the material. The material enters the vacuum feeder 111 through the powder inlet 11, then enters the pipeline demagnetizer 31 for initial demagnetization, and finally enters the inner cavity 23 for secondary demagnetization. The entire process involves sealed powder transport, preventing material contamination. The vacuum feeder 111 also reduces manual labor intensity and improves work efficiency.

[0065] Optionally, the output end of the vacuum feeder 111 is provided with a feeder 113; one end of the feeder 113 is connected to the vacuum feeder 111; the other end of the feeder 113 is connected to the pipeline demagnetizer 31.

[0066] Specifically, the feeder 113 is preferably a single-tube screw feeder 113, which facilitates the metering and control of powdery materials. The single-tube screw feeder uses a closed conveying system for materials, and when combined with the vacuum feeder 111, it has good sealing performance, which can avoid dust pollution to the environment and ensure stable feeding.

[0067] Optionally, the second demagnetizing component includes: a plurality of magnetic strips 32; the magnetic strips 32 are disposed on the inner wall near the bottom of the barrel.

[0068] Specifically, after the solvent enters the tank through the liquid inlet 12, it mixes with the material to form a solution. In the solution, substances of the same volume experience the same buoyancy. However, substances with lower density experience a smaller difference between the buoyancy and their own weight, making it easier for them to maintain their position or float. Substances with higher density experience a larger difference between the buoyancy and their own weight, making them easier to sink. Since the density of the magnetic material in the material is greater than that of the iron phosphate powder, it easily sinks to the bottom of the tank wall and is attracted by the magnetic strip 32, thus undergoing secondary demagnetization and thoroughly removing the magnetic material. In practice, an outlet 41 can be set at the bottom of the tank, and a discharge pump 411 can be set near the outlet 41. After demagnetization, the iron phosphate slurry is transported by the discharge pump 411 from the outlet 41 to the separation equipment for solid-liquid separation, followed by drying and dehydration to obtain demagnetized iron phosphate powder.

[0069] The inner cavity 23 of the barrel is preferably made of glass fiber reinforced plastic. The inner cavity 23 of the barrel made of glass fiber reinforced plastic has a certain mechanical strength, is lightweight and corrosion resistant, and will not adversely affect the demagnetization of the magnetic strip 32.

[0070] Optionally, a magnetic groove cover 321 is fitted onto the magnetic strip 32; the magnetic groove cover 321 is disposed on the inner wall near the bottom of the barrel; a buckle 322 is provided at the outlet end of the magnetic groove cover 321; the buckle 322 passes through the barrel and is connected to the magnetic groove cover 321.

[0071] When the magnetic material on the magnetic strip 32 needs to be collected or cleaned, the buckle 322 can be released, and the magnetic strip 32 can be directly removed from the magnetic groove cover 321 for convenient and quick collection or cleaning of the magnetic material on the magnetic strip 32. In practice, depending on the specific situation, the buckle 322 can be designed as a detachable or clasp-type structure to facilitate the removal of the magnetic strip 32 from the barrel cavity.

[0072] Optionally, the included angle between any two magnetic strips 32 on the same plane is 120°; every three magnetic strips 32 on the same plane form a group of magnetic groups 32, and a total of M groups of magnetic groups 32 are set at different heights on the inner wall of the barrel; where M is an integer greater than 0.

[0073] In this embodiment, six magnetic strips are arranged in two groups. Multiple magnetic groups 32 are distributed at different heights inside the barrel, which helps to improve the adsorption efficiency and demagnetization effect of magnetic materials. Figure 2 As shown, when the barrel is cylindrical, the three magnetic strips 32 on the same plane are evenly distributed and arranged in a circular array, which is beneficial to improving the adsorption efficiency of magnetic materials.

[0074] Optionally, the magnetic strip 32 is fitted with a tetrafluoroethylene sleeve.

[0075] The PTFE sleeve, also known as polytetrafluoroethylene tubing, has extremely high corrosion resistance and can be used in extreme environments such as strong acids, strong alkalis, and strong oxidants. It can prevent the magnetic strip 32 from being corroded, and at the same time, it is easy to remove the sleeve to collect the magnetic material adsorbed on the sleeve.

[0076] Optionally, the inner wall of the barrel is provided with M baffles 24; M is an integer greater than 0.

[0077] M baffles 24 are installed on the inner wall of the barrel. The baffles 24 are inclined downwards at a certain angle relative to the barrel wall. When the liquid flows, it comes into contact with the baffles 24, and the liquid's flow direction is changed due to the obstruction of the inclined baffles 24. This prevents the liquid in the inner cavity 23 of the barrel from flowing horizontally, enhances the stirring effect, and ensures that the material and liquid solution are thoroughly and quickly mixed, preventing the iron phosphate powder from clumping and settling at the bottom of the barrel. The number of baffles 24 can be determined according to the specific size of the barrel. In this embodiment, there are 12 baffles 24, evenly arranged in 4 layers at different heights on the inner wall of the barrel, with 3 baffles evenly arranged in each layer to ensure good stirring effect.

[0078] Optionally, the stirring assembly includes: a stirring paddle 22 and a stirring motor 21; the stirring paddle 22 is electrically connected to the stirring motor 21; the stirring paddle 22 is disposed inside the barrel.

[0079] Specifically, the stirring paddle 22 is one or more layers, used to fully and quickly mix the material with the liquid solution, and to prevent the iron phosphate powder from clumping together and settling at the bottom of the container.

[0080] It is understood that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that, for those skilled in the art, without departing from the concept of this application, the above technical features can be freely combined, and several modifications and improvements can be made, all of which fall within the protection scope of this application. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of this application should fall within the scope of the claims of this application.

Claims

1. A demagnetizing device for ferric phosphate, characterized in that, It includes: a barrel body; a powder inlet and a liquid inlet are provided at the top of the barrel body; a first demagnetizing component and a second demagnetizing component are sequentially provided on the barrel body; the first demagnetizing component is connected to the powder inlet; the second demagnetizing component is provided on the inner wall of the barrel body; and a stirring assembly is provided inside the barrel body.

2. The demagnetizing device for ferric phosphate according to claim 1, characterized in that, The first demagnetizing component includes: a pipeline demagnetizer; the pipeline demagnetizer has several magnetic rods installed inside; the input end of the pipeline demagnetizer is connected to the powder inlet; and the output end of the pipeline demagnetizer is connected to the inner cavity of the barrel.

3. The demagnetizing device for ferric phosphate according to claim 2, characterized in that, The input end of the pipeline demagnetizer is connected to a vacuum feeder; the powder inlet is located on the side wall of the vacuum feeder; and a vacuum pump is installed on the vacuum feeder.

4. A demagnetizing device for ferric phosphate according to claim 3, characterized in that, The vacuum feeder is equipped with a feeder at its output end; one end of the feeder is connected to the vacuum feeder; the other end of the feeder is connected to the pipeline demagnetizer.

5. A demagnetizing device for ferric phosphate according to claim 1, characterized in that, The second demagnetizing component includes: a plurality of magnetic strips; the magnetic strips are disposed on the inner wall near the bottom of the barrel.

6. A demagnetizing device for ferric phosphate according to claim 5, characterized in that, A magnetic groove cover is fitted onto the magnetic strip; the magnetic groove cover is located on the inner wall near the bottom of the barrel; a buckle is provided at the outlet end of the magnetic groove cover; the buckle passes through the barrel and connects to the magnetic groove cover.

7. A demagnetizing device for ferric phosphate according to claim 5, characterized in that, The included angle between any two magnetic strips on the same plane is 120°; every three magnetic strips on the same plane form a magnetic group, and a total of M magnetic groups are set at different heights on the inner wall of the barrel; where M is an integer greater than 0.

8. A demagnetizing device for ferric phosphate according to claim 5, characterized in that, The magnetic strip is fitted with a PTFE sleeve.

9. A demagnetizing device for ferric phosphate according to claim 1, characterized in that, The inner wall of the barrel is provided with M baffles; M is an integer greater than 0.

10. A demagnetizing device for ferric phosphate according to claim 1, characterized in that, The stirring assembly includes: a stirring paddle and a stirring motor; the stirring paddle is electrically connected to the stirring motor; the stirring paddle is disposed inside the barrel.

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