Magnetic foreign matter removing device and method

Abstract

The invention discloses a magnetic foreign matter removing device and method. The magnetic foreign matter removing device comprises a reactor, a magnetizing coil, a reverse suspension coil and a liquid film demagnetizing device. The reactor is provided with a demagnetizing cavity, a feed port and a discharge port, the feed port is communicated with the upper end of the demagnetizing cavity, and the discharge port is communicated with the lower end of the demagnetizing cavity; the magnetizing coil is arranged in the demagnetizing cavity and is positioned at the upper part of the demagnetizing cavity; the reverse suspension coil is arranged in the demagnetizing cavity and located below the magnetizing coil, and the reverse suspension coil and the magnetizing coil form a forward and reverse magnetic field; the liquid film demagnetizing device is arranged in the demagnetizing cavity and located between the magnetizing coil and the reverse suspension coil, and the liquid film demagnetizing device is used for forming a magnetic fluid liquid film. According to the invention, the magnetic foreign matters can be efficiently removed on the premise of not changing the material characteristics of the material.

Description

Technical Field

[0001] This invention relates to the field of demagnetizing equipment technology, and in particular to a device and method for removing magnetic foreign objects. Background Technology

[0002] Currently, new energy companies are developing rapidly, and the main material for new energy batteries is lithium iron phosphate. As the raw material for lithium iron phosphate, the production process of iron phosphate contains magnetic foreign matter such as Cu and Zn. These magnetic foreign matter greatly affect the service life of lithium iron phosphate batteries, so it is necessary to demagnetize the iron phosphate material.

[0003] In related technologies, demagnetizing devices generally employ methods such as wet demagnetization, high-temperature sintering demagnetization, and magnetic demagnetization. Wet demagnetization requires dissolving the iron phosphate crystals to extract the magnetic material, while high-temperature sintering demagnetization involves mixing electromagnetic slag with powdered organic carbon sources and then sintering at high temperatures. Both of these methods alter the properties of the original material and require stringent reaction conditions. Magnetic demagnetization, on the other hand, has poor demagnetization efficiency and demands high-quality permanent magnets. Therefore, there is a need for a demagnetizing device that offers good demagnetization performance, does not alter the original state of the crystals, and has simple reaction conditions, enabling its widespread application in the manufacturing process of new energy materials. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a magnetic foreign matter removal device and method.

[0005] The solution to the technical problem of this invention is: Firstly, a magnetic foreign matter removal device is proposed, comprising: The reactor is provided with a demagnetizing chamber, a feed inlet and a discharge outlet, the feed inlet being connected to the upper end of the demagnetizing chamber and the discharge outlet being connected to the lower end of the demagnetizing chamber; A magnetizing coil is disposed inside the demagnetizing cavity and located at the upper part of the demagnetizing cavity; A reverse levitation coil is disposed inside the demagnetizing cavity and located below the magnetizing coil. The reverse levitation coil and the magnetizing coil form positive and negative magnetic fields, respectively. A liquid film demagnetizer is disposed within the demagnetizing cavity and located between the magnetizing coil and the reverse levitation coil. The liquid film demagnetizer is used to form a magnetofluid liquid film.

[0006] This invention offers at least the following advantages: A positive and negative magnetic field is formed between the magnetizing coil and the reverse levitation coil. When the magnetofluid enters the liquid film demagnetizer, it suspends in a liquid film state under the influence of the positive and negative magnetic fields, thus forming a magnetofluid liquid film. When the material to be demagnetized passes through the liquid film demagnetizer, the magnetofluid liquid film adsorbs the magnetic foreign matter on the material surface. Throughout the demagnetization process, the material does not need to be dissolved or altered, maintaining its original material properties. Furthermore, the magnetofluid liquid film can directly contact the magnetic foreign matter on the material surface, resulting in higher efficiency in removing magnetic foreign matter and higher purity of the processed product.

[0007] As a further improvement to the above technical solution, the liquid film demagnetizer is a box with a mesh structure, which is used to separate the magnetic fluid. The mesh structure can separate the magnetic fluid into an extremely thin liquid film, and use positive and negative magnetic fields to maintain the stability of the magnetic fluid liquid film, ensuring that the magnetic fluid is not carried away by the material passing through, thus preventing magnetic fluid loss.

[0008] As a further improvement to the above technical solution, the magnetic foreign matter removal device further includes a circulation assembly, which includes a circulation pump, an inlet pipe, and an outlet pipe. The outlet end of the circulation pump is connected to the inlet end of the inlet pipe, the outlet end of the inlet pipe is connected to the inlet end of the liquid film demagnetizer, the inlet end of the outlet pipe is connected to the outlet end of the liquid film demagnetizer, and the outlet end of the outlet pipe is connected to the inlet end of the circulation pump. The inlet pipe, the liquid film demagnetizer, the circulation pump, and the outlet pipe form a circulation loop. The magnetic fluid circulates in this loop under the action of the circulation pump, which can improve the utilization rate of the magnetic fluid.

[0009] As a further improvement to the above technical solution, the circulation assembly further includes a return pipe, a purification pipe, a discharge pipe, a filter, a first valve, a second valve, and a third valve. The filter is used to filter and recover magnetic foreign matter in the magnetic fluid. The first valve is located on the return pipe, the second valve is located on the purification pipe, and the third valve is located on the discharge pipe. The inlet end of the return pipe and the inlet end of the discharge pipe are respectively connected to the outlet end of the liquid outlet pipe. The outlet end of the discharge pipe is connected to the inlet end of the filter, and the outlet end of the filter is connected to the inlet end of the purification pipe. The outlet end of the return pipe and the outlet end of the purification pipe are respectively connected to the inlet end of the circulation pump.

[0010] The filter is used to filter and recycle magnetic foreign objects adsorbed in the magnetic fluid. When the magnetic fluid is saturated, it is allowed to enter the filter for purification and regeneration to ensure the demagnetization effect.

[0011] As a further improvement to the above technical solution, the circulation component further includes a controller and a first detection component. The first detection component is located at the discharge port and is used to detect the content of magnetic foreign matter in the material. The first detection component, the first valve, the second valve, and the third valve are electrically connected to the controller. The controller is configured to: when the first detection component detects that the content of magnetic foreign matter in the material is greater than or equal to a first preset value, control the first valve to close and control the second valve and the third valve to open.

[0012] The first detection component detects the content of magnetic foreign matter in the material at the outlet, and the controller realizes automatic control of the first, second and third valves, which can achieve automation and timely purify the saturated magnetic fluid to ensure the demagnetization effect.

[0013] As a further improvement to the above technical solution, the magnetic foreign matter removal device further includes a dehydration component, which includes a drying fan and an air outlet pipe. The air outlet pipe and the drying fan are respectively connected to the reaction chamber and located below the liquid film demagnetizer. The air outlets of the air outlet pipe and the drying fan are respectively connected to the demagnetization chamber. The drying fan can introduce airflow into the demagnetization chamber and dry the moisture on the surface of the material crystals to obtain the final product. After entering the demagnetization chamber, the airflow is discharged through the air outlet pipe.

[0014] As a further improvement to the above technical solution, the drying fan is located below the air outlet pipe. Since the demagnetized material is discharged from top to bottom under the action of gravity, when the drying fan blows air into the demagnetization chamber, the airflow flows from bottom to top and flows out through the air outlet pipe. The airflow direction is opposite to the running direction of the demagnetized material, thereby obtaining a longer drying time and making the drying more complete.

[0015] As a further improvement to the above technical solution, the magnetic foreign matter removal device also includes a feeding hopper, the outlet of which is connected to the feed inlet. The feeding hopper guides the material into the reactor.

[0016] Secondly, a method for removing magnetic foreign matter is proposed, applied to the magnetic foreign matter removal device described in any of the above technical solutions, wherein the magnetic foreign matter removal method includes the following steps: Power is supplied to the magnetizing coil and the reverse levitation coil respectively to form positive and negative magnetic fields in the demagnetizing cavity; A magnetic fluid is introduced into the liquid film demagnetizer, and the magnetic fluid forms a suspended magnetic fluid liquid film under the action of the positive and negative magnetic fields; The material to be demagnetized is added into the demagnetizing chamber through the feed port, and the material is discharged from the discharge port after passing through the magnetofluid film.

[0017] When materials to be demagnetized pass through a liquid film demagnetizer, the magnetofluid liquid film adsorbs the magnetic foreign matter on the material surface. Throughout the demagnetization process, the material does not need to be dissolved or altered, maintaining its original material properties. Furthermore, the magnetofluid liquid film can directly contact the magnetic foreign matter on the material surface, resulting in higher efficiency in removing magnetic foreign matter and higher purity of the treated product.

[0018] As a further improvement to the above technical solution, the magnetic foreign matter removal device further includes a dehydration component, which includes a drying fan and an air outlet pipe. The air outlet pipe and the drying fan are respectively connected to the reactor and located on the lower side of the liquid film demagnetizer. The air outlet of the air outlet pipe and the air outlet of the drying fan are respectively connected to the demagnetization chamber. The method for removing magnetic foreign objects also includes the following steps: Turn on the drying fan and make the airflow blown into the demagnetizing chamber in the opposite direction to the material discharge direction.

[0019] As the material flows from top to bottom and is discharged through the outlet located at the bottom of the reaction chamber, the airflow provided by the drying fan flows from bottom to top, which can thoroughly dry the moisture on the surface of the material crystals.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of the present invention, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the magnetic foreign matter removal device according to an embodiment of the present invention; Figure 2 This is a flowchart of a magnetic foreign object removal method according to an embodiment of the present invention.

[0023] Reference numerals: 100, reactor; 200, magnetizing coil; 300, reverse suspension coil; 400, liquid film demagnetizer; 500, circulation assembly; 510, circulation pump; 520, liquid outlet pipe; 530, liquid inlet pipe; 540, reflux pipe; 541, first valve; 550, purification pipe; 551, second valve; 560, discharge pipe; 561, third valve; 600, dewatering assembly; 610, drying fan; 620, air outlet pipe; 700, hopper. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of this invention, the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0026] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0028] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. The various technical features of the present invention can be combined interactively without contradicting each other.

[0029] Reference Figure 1 In the first aspect, the present invention provides a magnetic foreign matter removal device that can be applied to the removal of magnetic foreign matter from iron phosphate. It not only allows the iron phosphate crystals to maintain their original state and material properties, but also provides simple demagnetization conditions and good demagnetization effect.

[0030] The magnetic foreign matter removal device includes a reaction chamber, a magnetizing coil 200, a reverse suspension coil 300, and a liquid film demagnetizer 400. The reactor 100 is equipped with a demagnetizing chamber, an inlet, and an outlet. The inlet is connected to the upper end of the demagnetizing chamber, and the outlet is connected to the lower end. The reactor 100 provides the reaction space for demagnetizing the material. Both the magnetizing coil 200 and the reverse suspension coil 300 are located within the demagnetizing chamber and are connected to a power source. The magnetizing coil 200 is located at the upper part of the demagnetizing chamber, while the reverse suspension coil 300 is located below the magnetizing coil 200. When the magnetizing coil 200 and the reverse suspension coil 300 are energized, they can generate positive and negative magnetic fields within the demagnetizing chamber. The liquid film demagnetizer 400 is located within the demagnetizing chamber, between the magnetizing coil 200 and the reverse suspension coil 300. The liquid film demagnetizer 400 can form a magnetofluid liquid film between the magnetizing coil 200 and the reverse suspension coil 300.

[0031] When using the magnetic foreign matter removal device of this embodiment to demagnetize ferric phosphate, ferric phosphate crystals are added into the demagnetization chamber through the feed port. As the material passes through the magnetic fluid film, magnetic foreign matter such as Cu and Zn on the crystal surface can be adsorbed by the magnetic fluid film. The demagnetized material is discharged through the discharge port. Throughout the demagnetization process, it is not necessary to dissolve the ferric phosphate, thus preserving the state of the ferric phosphate crystals and maintaining their material properties. Moreover, compared to the magnet demagnetization process, the magnetic foreign matter removal device of this embodiment has a more thorough adsorption effect on magnetic foreign matter. The magnetic fluid film comes into contact with the magnetic foreign matter, resulting in higher efficiency in removing magnetic foreign matter and higher purity of the demagnetized product.

[0032] It is understandable that when the magnetofluid enters the liquid film demagnetizer 400, under the influence of positive and negative magnetic fields, the nano-sized iron(III) oxide (Fe3O4) in the magnetofluid... The fluid is in a suspended liquid film state. The liquid film demagnetizer 400 uses positive and negative magnetic fields to maintain the stability of the magnetic fluid liquid film. When the iron phosphate crystal passes by, the iron phosphate crystal will not carry away the magnetic fluid and cause magnetic fluid loss.

[0033] In some embodiments, the liquid film demagnetizer 400 is a box with a mesh structure, which is used to separate the magnetic fluid. The mesh structure can separate the magnetic fluid into an extremely thin liquid film and use positive and negative magnetic fields to maintain the stability of the magnetic fluid liquid film, ensuring that the iron phosphate crystals do not carry away the magnetic fluid and cause magnetic fluid loss when passing through.

[0034] In some embodiments, the magnetic foreign object removal device further includes a circulation assembly 500, which includes a circulation pump 510, an inlet pipe 530, and an outlet pipe 520. The outlet end of the circulation pump 510 is connected to the inlet end of the inlet pipe 530, the outlet end of the inlet pipe 530 is connected to the inlet end of the liquid film demagnetizer 400, the inlet end of the outlet pipe 520 is connected to the outlet end of the liquid film demagnetizer 400, and the outlet end of the outlet pipe 520 is connected to the inlet end of the circulation pump 510.

[0035] With this configuration, the inlet pipe 530, the liquid film demagnetizer 400, the circulation pump 510, and the outlet pipe 520 form a circulation loop. The magnetic fluid circulates in this loop under the action of the circulation pump 510. When it enters the liquid film demagnetizer 400, the magnetic fluid is in a liquid film state and adsorbs magnetic foreign objects, which can improve the utilization rate of the magnetic fluid.

[0036] Furthermore, the circulation assembly 500 also includes a return pipe 540, a purification pipe 550, a discharge pipe 560, a filter, a first valve 541, a second valve 551, and a third valve 561. The first valve 541 is disposed on the return pipe 540, the second valve 551 is disposed on the purification pipe 550, and the third valve 561 is disposed on the discharge pipe 560. The inlet ends of the return pipe 540 and the discharge pipe 560 are respectively connected to the outlet ends of the liquid outlet pipe 520. The outlet end of the discharge pipe 560 is connected to the inlet end of the filter. The outlet end of the filter is connected to the inlet end of the purification pipe 550. The outlet ends of the return pipe 540 and the purification pipe 550 are respectively connected to the inlet ends of the circulation pump 510.

[0037] In use, the first valve 541 is opened and the second valve 551 and the third valve 561 are closed. The magnetic fluid discharged from the outlet pipe 520 flows along the return pipe 540 and returns to the inlet pipe 530 under the action of the circulation pump 510, thus achieving cyclic adsorption. It can be understood that the magnetic fluid can continue to flow along the above-mentioned circulation loop and perform cyclic adsorption before adsorption saturation.

[0038] Understandably, the filter is used to filter and recover magnetic foreign matter adsorbed in the magnetic fluid. When the magnetic fluid is saturated, the first valve 541 is opened and closed, and the second valve 551 and the third valve 561 are opened, allowing the magnetic fluid discharged from the outlet pipe 520 to enter the filter along the discharge pipe 560 for filtration. The magnetic fluid purified and regenerated in the filter can flow out along the purification pipe 550 and enter the liquid film demagnetizer 400 along the inlet pipe 530 under the action of the circulation pump 510, continuing to demagnetize the material.

[0039] In some embodiments, the filter is layered with different filter media to filter and adsorb magnetic foreign objects, such as Cu and Zn, from the saturated magnetic fluid. It is understood that when the second valve 551 and the third valve 561 are closed and the first valve 541 is opened, the operator can process the filter media to prevent saturation and subsequent failure to filter magnetic foreign objects from the magnetic fluid. It is also understood that the cleaning process does not affect the circulation and adsorption of the magnetic fluid, thus achieving online cleaning.

[0040] In some embodiments, the inlet end of the filter is located at the lower end of the filter, and the outlet end is located at the upper end of the filter. The magnetic fluid entering the filter flows upward, which can improve the filtration effect.

[0041] In some embodiments, the circulation assembly 500 further includes a controller, wherein the first valve 541, the second valve 551 and the third valve 561 in the circulation assembly 500 are electrically connected to the controller and are automatically controlled by the controller.

[0042] In some embodiments, the circulation assembly 500 further includes a first detection component disposed at the discharge port. This first detection component detects the content of magnetic foreign matter in the material discharged from the discharge port. The first detection component, first valve 541, second valve 551, and third valve 561 are electrically connected to a controller. When the first detection component detects that the content of magnetic foreign matter in the material is greater than or equal to a first preset value, the controller controls the first valve 541 to close and controls the second valve 551 and the third valve 561 to open, thereby switching the circulation loop. It is understood that the first preset value is the material discharge requirement value.

[0043] In other embodiments, the controller determines whether the magnetic fluid needs filtration based on the content of magnetic foreign matter in the magnetic fluid and controls the states of the first valve 541, the second valve 551, and the third valve 561. For example, a second detection component for detecting the content of magnetic foreign matter is provided at the outlet pipe 520. When the second detection component detects that the content of magnetic foreign matter in the magnetic fluid remains unchanged or is greater than a second preset value for a period of time, it determines that the magnetic fluid is saturated. At this time, the first valve 541 is closed, and the second valve 551 and the third valve 561 are opened, allowing the magnetic fluid to enter the filter for filtration and regeneration. The magnetic fluid circulates in the circulation loop flowing through the filter. When the second detection component detects that the content of magnetic foreign matter in the magnetic fluid is less than a third preset value, it determines that there are few magnetic foreign matter in the magnetic fluid, closes the second valve 551 and the third valve 561, and opens the first valve 541, allowing the magnetic fluid to circulate in the circulation loop that does not flow through the filter.

[0044] In other embodiments, the controller determines whether the magnetic fluid needs filtration based on the adsorption time. For example, after the magnetic fluid has adsorbed for a first preset time, if it is determined that the magnetic fluid is saturated or nearly saturated, the first valve 541 is closed, and the second valve 551 and the third valve 561 are opened, allowing the magnetic fluid to enter the filter for filtration and regeneration. After the magnetic fluid circulates in the filter's circulation loop for a second preset time, if it is determined that the content of magnetic foreign matter in the magnetic fluid is low or the magnetic foreign matter in the filter is saturated, the second valve 551 and the third valve 561 are closed, and the first valve 541 is opened, allowing the magnetic fluid to circulate in a circulation loop that does not flow through the filter.

[0045] Understandably, the controller can be a microcontroller, PLC controller, etc. The first valve 541, the second valve 551, and the third valve 561 can be solenoid valves, etc.

[0046] In some embodiments, the magnetic foreign matter removal device further includes a dehydration component 600, which includes a drying fan 610 and an air outlet pipe 620. The air outlet pipe 620 and the drying fan 610 are respectively connected to the reaction chamber and are located below the liquid film demagnetizer 400. The air outlets of the air outlet pipe 620 and the drying fan 610 are respectively connected to the demagnetization chamber.

[0047] Understandably, the drying fan 610 can introduce airflow into the demagnetizing chamber and dry the moisture on the surface of the material crystals to obtain the final product. After entering the demagnetizing chamber, the airflow is discharged through the air outlet pipe 620.

[0048] In some embodiments, the drying fan 610 is positioned below the air outlet pipe 620. With this configuration, when the drying fan 610 blows air into the demagnetizing chamber, the airflow flows from bottom to top and exits through the air outlet pipe 620. Since the demagnetized material is discharged from top to bottom under gravity, the airflow direction is opposite to the direction of material movement after demagnetization, thereby achieving a longer drying time and more complete drying.

[0049] In some embodiments, the magnetic foreign matter removal device further includes a hopper 700, the outlet end of which is connected to the inlet. The hopper 700 is configured to guide material into the reactor 100.

[0050] In some embodiments, a fourth valve is provided at the outlet end of the hopper 700, and the speed at which the material enters the reactor 100 can be controlled by adjusting the opening degree of the fourth valve.

[0051] Secondly, embodiments of the present invention provide a method for removing magnetic foreign matter, which is applied to the magnetic foreign matter removal device as described in any embodiment of the first aspect. The method achieves demagnetization of the material by direct contact between a magnetofluid film and the material. The magnetic foreign matter removal method includes steps S101, S102, and S103, as described below. Figure 2 .

[0052] In step S101, power is supplied to the magnetizing coil 200 and the reverse levitation coil 300 respectively to form positive and negative magnetic fields within the demagnetizing cavity. It is understood that the formed positive and negative magnetic fields can maintain the subsequently formed magnetofluid film and prevent material from carrying away the magnetofluid, thus avoiding magnetofluid loss.

[0053] Step S102: A magnetic fluid is introduced into the liquid film demagnetizer 400. Under the influence of positive and negative magnetic fields, the magnetic fluid forms a suspended magnetic fluid liquid film. When the magnetic fluid enters the liquid film demagnetizer 400, under the influence of the positive and negative magnetic fields, the nano-sized iron(III) oxide (Fe3O4) in the magnetic fluid... The fluid exists in a suspended liquid film state and remains stable.

[0054] In step S103, the material to be demagnetized is added into the demagnetization chamber through the feed inlet, and the material is discharged from the outlet after passing through the magnetofluid liquid film. The material enters the reactor 100 through the feed hopper 700, and the magnetofluid liquid film that exists stably in the magnetic field adsorbs magnetic foreign matter such as Cu and Zn on the surface of the material crystals.

[0055] In some embodiments, the magnetic foreign matter removal device further includes a dehydration component 600, which includes a drying fan 610 and an air outlet 620. The air outlet 620 and the drying fan 610 are respectively connected to the reactor 100 and located below the liquid film demagnetizer 400. The air outlets of the air outlet 620 and the drying fan 610 are respectively connected to the demagnetization chamber. When performing step S103, the drying fan 610 is turned on and blows air into the demagnetization chamber. The direction of the airflow is opposite to the direction of material discharge. Specifically, since the material flows from top to bottom and is discharged through the outlet located at the lower end of the reaction chamber, the airflow provided by the drying fan 610 flows from bottom to top, which can thoroughly dry the moisture on the surface of the material crystals.

[0056] In some embodiments, the magnetic foreign matter removal method further includes step S104, whereby when the demagnetization effect of the material discharged from the outlet is lower than the required discharge value, the magnetic fluid is transported to the filter for adsorption and regeneration. Specifically, the magnetic foreign matter removal device further includes a circulation component 500, which includes a circulation pump 510, an inlet pipe 530, an outlet pipe 520, a return pipe 540, a purification pipe 550, a discharge pipe 560, a filter, a first valve 541, a second valve 551, and a third valve 561. The connection method of each component of the circulation component 500 and the control method of each valve have been described in the embodiments of the first aspect and will not be repeated here. It can be understood that the magnetic fluid regenerated by the filter enters the liquid film demagnetizer 400 to continue adsorbing magnetic foreign matter, which can realize the continuous reuse of the magnetic fluid and the precise separation of magnetic foreign matter.

[0057] The process of removing Cu, Zn, and other magnetic foreign matter from ferric phosphate crystals using this magnetic foreign matter removal device and method is as follows: Ferric phosphate crystals containing Cu and Zn magnetic foreign matter enter reactor 100 and pass through liquid film demagnetizer 400. Through contact adsorption by the magnetic fluid liquid film, the Cu, Zn, and other magnetic foreign matter on the surface of the ferric phosphate crystals separate from the crystals. The ferric phosphate crystals then continue to fall, and under the action of dehydration component 600, the water adhering to the surface of the crystals is removed. Subsequently, the ferric phosphate crystals are discharged through the outlet. Meanwhile, the magnetic fluid that adsorbs the magnetic foreign matter continuously circulates in the loop formed by inlet pipe 530, circulation pump 510, and outlet pipe 520 until saturation. The saturated magnetic fluid is discharged through discharge pipe 560 to a filter for stratified filtration, and then returned to the loop through purification pipe 550, realizing the regeneration and reuse of the magnetic fluid.

[0058] The embodiments of the present invention can realize the functions of magnetic foreign matter purification, drying, magnetic fluid recycling and magnetic fluid regeneration of iron phosphate crystals, and have the advantages of sufficient reaction, regeneration and high purity of finished product.

[0059] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A magnetic foreign object removal device, characterized in that, include: The reactor (100) is provided with a demagnetizing chamber, a feed inlet and a discharge outlet, the feed inlet being connected to the upper end of the demagnetizing chamber and the discharge outlet being connected to the lower end of the demagnetizing chamber; A magnetizing coil (200) is disposed inside the demagnetizing cavity and located at the upper part of the demagnetizing cavity; A reverse levitation coil (300) is disposed in the demagnetizing cavity and located below the magnetizing coil (200). The reverse levitation coil (300) and the magnetizing coil (200) form positive and negative magnetic fields. A liquid film demagnetizer (400) is disposed in the demagnetizing cavity and located between the magnetizing coil (200) and the reverse suspension coil (300). The liquid film demagnetizer (400) is used to form a magnetofluid liquid film.

2. The magnetic foreign matter removal device according to claim 1, characterized in that, The liquid film demagnetizer (400) is a box with a mesh structure, which is used to separate the magnetofluid.

3. The magnetic foreign matter removal device according to claim 1, characterized in that, The magnetic foreign object removal device further includes a circulation assembly (500), which includes a circulation pump (510), an inlet pipe (530), and an outlet pipe (520). The outlet end of the circulation pump (510) is connected to the inlet end of the inlet pipe (530), the outlet end of the inlet pipe (530) is connected to the inlet end of the liquid film demagnetizer (400), the inlet end of the outlet pipe (520) is connected to the outlet end of the liquid film demagnetizer (400), and the outlet end of the outlet pipe (520) is connected to the inlet end of the circulation pump (510).

4. The magnetic foreign matter removal device according to claim 3, characterized in that, The circulation assembly (500) further includes a return pipe (540), a purification pipe (550), a discharge pipe (560), a filter, a first valve (541), a second valve (551), and a third valve (561). The filter is used to filter and recover magnetic foreign matter in the magnetic fluid. The first valve (541) is located on the return pipe (540), the second valve (551) is located on the purification pipe (550), and the third valve (561) is located on the discharge pipe (560). The inlet end of the return pipe (540) and the inlet end of the discharge pipe (560) are respectively connected to the outlet end of the liquid outlet pipe (520). The outlet end of the discharge pipe (560) is connected to the inlet end of the filter. The outlet end of the filter is connected to the inlet end of the purification pipe (550). The outlet end of the return pipe (540) and the outlet end of the purification pipe (550) are respectively connected to the inlet end of the circulation pump (510).

5. The magnetic foreign matter removal device according to claim 4, characterized in that, The circulation component (500) further includes a controller and a first detection component. The first detection component is located at the discharge port and is used to detect the content of magnetic foreign matter in the material. The first detection component, the first valve (541), the second valve (551) and the third valve (561) are electrically connected to the controller. The controller is configured to: when the first detection component detects that the content of magnetic foreign matter in the material is greater than or equal to a first preset value, control the first valve (541) to close and control the second valve (551) and the third valve (561) to open.

6. The magnetic foreign matter removal device according to claim 1, characterized in that, The magnetic foreign object removal device further includes a dehydration component (600), which includes a drying fan (610) and an air outlet pipe (620). The air outlet pipe (620) and the drying fan (610) are respectively connected to the reaction chamber and located below the liquid film demagnetizer (400). The air outlets of the air outlet pipe (620) and the drying fan (610) are respectively connected to the demagnetization chamber.

7. The magnetic foreign matter removal device according to claim 6, characterized in that, The drying fan (610) is located on the lower side of the air outlet pipe (620).

8. The magnetic foreign matter removal device according to claim 1, characterized in that, The magnetic foreign object removal device also includes a feeding hopper (700), the outlet end of which is connected to the feeding port.

9. A method for removing magnetic foreign objects, characterized in that, The magnetic foreign matter removal device as described in any one of claims 1 to 8, wherein the magnetic foreign matter removal method comprises the following steps: Power is supplied to the magnetizing coil (200) and the reverse levitation coil (300) respectively to form positive and negative magnetic fields in the demagnetizing cavity; A magnetic fluid is introduced into the liquid film demagnetizer (400), and the magnetic fluid forms a suspended magnetic fluid liquid film under the action of the positive and negative magnetic fields; The material to be demagnetized is added into the demagnetizing chamber through the feed port, and the material is discharged from the discharge port after passing through the magnetofluid film.

10. The method for removing magnetic foreign matter according to claim 9, characterized in that, The magnetic foreign matter removal device further includes a dehydration component (600), which includes a drying fan (610) and an air outlet pipe (620). The air outlet pipe (620) and the drying fan (610) are respectively connected to the reactor (100) and located on the lower side of the liquid film demagnetizer (400). The air outlets of the air outlet pipe (620) and the drying fan (610) are respectively connected to the demagnetization chamber. The method for removing magnetic foreign objects also includes the following steps: Turn on the drying fan (610) and make the airflow blown into the demagnetizing chamber by the drying fan (610) in the opposite direction to the material discharge direction.

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