Magnetic bar and magnetic separation device

Abstract

According to the magnetic bar and the magnetic separation device provided by the utility model, the surface of the magnetic bar body is coated with the high polymer coating film, so that the magnetic bar shell is not in direct contact with metal powder in the magnetic separation discharging process. A magnetic bar (200) is provided with: a magnetic bar body (210) that has a magnetic core and a stainless steel case and is used in a magnetic separation device (100); and the high polymer coating film (220) is coated on the surface of the magnetic rod body (210).

Description

Technical Field

[0001] The utility model relates to a magnetic rod and a magnetic separation device. Background Art

[0002] With the development of electronic technology, lithium-ion batteries, as a new type of energy storage method, have been developed and utilized since the 1990s. Due to their advantages such as high energy density, light weight, long cycle life, no memory effect, and green environmental protection, they have been widely used in portable electronic devices such as mobile phones, laptops, and cameras.

[0003] When manufacturing ternary lithium batteries, the first step is to verify whether the purchased positive electrode powder raw materials meet the specified requirements. Specifically, it is necessary to verify whether the positive electrode powder raw materials contain magnetic foreign matter. Therefore, to complete this verification, it is necessary to use a magnetic separation device to magnetically separate the positive electrode powder raw materials and collect the magnetic powder at the magnetic rod.

[0004] Furthermore, lithium batteries need to be separated and recycled after their lifespan has expired. During the battery recycling process, the batteries are crushed and then sieved. This recycling process also requires the use of magnetic separation equipment to collect magnetic powder at the magnetic rod.

[0005] In the prior art, in order to verify the type, quantity and size of the separated magnetic powder, a magnetic bar is set at the discharge port of the magnetic separation device. The outer shell of the magnetic bar is in direct contact with the powder and attracts the magnetic powder therein. By analyzing the type and size of the magnetic powder on the magnetic bar before and after magnetic separation, it is determined whether the magnetic separation effect meets the requirements, thereby determining whether the powder raw material meets the specified requirements.

[0006] However, since the outer shell of the magnetic rod is in direct contact with the powder, wiping off the residual magnetic powder on the magnetic rod after magnetic separation is completed can easily cause damage to the surface of the magnetic rod, resulting in a limited life of the magnetic rod. In addition, due to the friction between the powder and the stainless steel surface of the magnetic rod, new magnetic powder is easily generated, causing distortion of the magnetic powder inspection results and affecting the sampling effect.

[0007] Furthermore, if the service life of the magnetic bar's stainless steel surface is reduced due to the impact and friction of metal powder, or if new magnetic powder is introduced due to scratches and shedding on the stainless steel surface of the magnetic bar, causing distortion of the magnetic bar verification results, if the newly introduced magnetic powder is not detected, it is more likely to cause an internal short circuit after the battery is made, and then the battery will thermally run away and explode, causing huge economic losses. Utility Model Content

[0008] In view of the above situation, the inventors of the present invention conducted intensive research and proposed a magnetic rod and a magnetic separation device, in which the surface of the magnetic rod body is coated with a polymer coating, so that the magnetic rod shell does not directly contact the metal powder during the magnetic separation process.

[0009] The technical solution of the present utility model is as follows.

[0010] The utility model provides a magnetic bar, which is characterized by comprising: a magnetic bar body, which has a magnetic core and a stainless steel shell and is used in a magnetic separation device; and a high polymer coating film, which is coated on the surface of the magnetic bar body.

[0011] Preferably, the polymer coating film serving as the sleeve is fixed to the surface of the magnetic rod body by thermoplasticization.

[0012] Preferably, the magnetic bar body has a sleeve insertion groove, and the polymer coating film serving as a sleeve is inserted into the sleeve insertion groove and fixed to the surface of the magnetic bar body.

[0013] Preferably, the polymer coating film is detachable relative to the magnetic rod body.

[0014] Preferably, the magnetic core of the magnetic bar body is an electromagnet that is magnetized when powered on and demagnetized when powered off.

[0015] In addition, the utility model provides a magnetic separation device, which is characterized in that it comprises: a feeding port, into which raw material powder is fed; a screening mechanism, which screens the raw material powder fed; and a magnetic separation mechanism, into which a magnetic rod for collecting magnetic powder is inserted, and magnetic separation is performed on the magnetic powder in the raw material powder after screening, and the magnetic rod comprises: a magnetic rod body, having a magnetic core and a stainless steel shell; and a polymer coating film, which covers the surface of the magnetic rod body.

[0016] Preferably, the magnetic separation mechanism performs magnetic separation on the positive electrode active material of the ternary lithium battery, and the magnetic rod collects the positive electrode active material on the surface of the polymer coating film.

[0017] Preferably, a plurality of magnetic bars are provided in the magnetic separation mechanism according to the feeding speed of the raw material powder in the magnetic separation device.

[0018] The effect of the utility model is as follows: the surface of the magnetic rod body is coated with a polymer coating film, thereby achieving the beneficial effects of extending the life of the magnetic rod, improving the quality of the output product, improving the accuracy of the output product quality verification, and improving the magnetic separation production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a magnetic separation device 100 according to one embodiment of the present invention.

[0020] Figure 2 This is a perspective view showing a state in which the magnetic bar 200 is inserted into the wall portion 131 of the magnetic separation mechanism 130 according to one embodiment of the present invention.

[0021] Figure 3A 1 is a schematic diagram showing an embodiment of the present invention before a polymer coating film 220 is coated on a magnetic bar body 210 .

[0022] Figure 3B 1 is a schematic diagram showing a state in which a polymer coating film 220 is coated on a magnetic bar body 210 according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present invention using the accompanying drawings. However, in the embodiments described below, various technically preferred limitations are added for the implementation of the present invention. Therefore, the scope of the technology disclosed herein is not limited to the following embodiments and illustrated examples. Furthermore, the sizes, shapes, and proportional relationships in the illustrated examples are merely illustrative and do not represent specific sizes, shapes, and proportional relationships. In addition, in the accompanying drawings, the same symbols are used for common components in the embodiments, and repeated descriptions are omitted.

[0024] Figure 1 FIG. 1 is a schematic structural diagram of a magnetic separation device 100 according to an embodiment of the present invention. Figure 1 As shown, the magnetic separation device 100 has a feeding port 110, a screening mechanism 120, and a magnetic separation mechanism 130. The magnetic separation device 100 is used, for example, to screen target metals from battery powder as a raw material powder. The target metals are, for example, magnetic foreign matter used to determine whether the powder raw material meets the specified requirements, and can also be positive active materials, negative active materials, and aluminum foil, copper foil, etc. used as positive and negative electrode sheets for recycling. The raw material powder includes but is not limited to battery powder of ternary lithium batteries, for example, ternary lithium battery powder that has been crushed and dried. The magnetic separation device 100 is used, for example, to magnetically separate positive active materials such as lithium nickel cobalt manganese oxide or lithium iron phosphate in the powder.

[0025] During a single magnetic separation operation, the magnetic separation device 100 feeds raw material powder into the feed port 110, causing the raw material powder to move within the internal space of the feed port 110. For example, the feed port 110 may be funnel-shaped, thereby enabling the feed rate of the raw material powder to be controlled even if a bag of raw material powder is fed into the feed port 110 at once. Furthermore, the feed path from the feed port 110 in the magnetic separation device 100 may also be equipped with a negative pressure pipeline or a conveying mechanism to assist in feeding.

[0026] The screening mechanism 120 is provided on the downstream side of the feeding port 110 to screen the raw material powder fed from the feeding port 110. The screening mechanism 120 is, for example, a vibrating screen. For example, a plurality of vibrating screens are sequentially arranged from the upstream side to the downstream side in descending order of the particle size of the powder. For example, in the screening mechanism 120, vibrating screens with a mesh size of less than 100, a mesh size of 100-200, and a mesh size of greater than 200 are sequentially arranged from the upstream side to the downstream side to separate fragments of different particle sizes in the raw material powder, so that the fine powder particles including the positive electrode active material are screened out to the downstream side of the screening mechanism 120, and other larger particulate matter is collected on the vibrating screen.

[0027] The magnetic separation mechanism 130 is provided downstream of the screening mechanism 120 , and has a magnetic bar 200 inserted therethrough for collecting magnetic powder. The magnetic separation mechanism 130 magnetically separates the magnetic powder in the powdered raw material powder screened by the screening mechanism 120 . Figure 2 This is a perspective view showing an embodiment of the present invention in which the magnetic rod 200 is inserted into the wall portion 131 of the magnetic separation mechanism 130. Figure 2 As shown, in the magnetic separation mechanism 130, a magnetic bar 200 is provided so as to be inserted through the magnetic separation mechanism 130 via an opening 132 provided in a wall portion 131 of the magnetic separation mechanism 130. The magnetic bar 200 is detachable from the wall portion 131 of the magnetic separation mechanism 130.

[0028] For example, in a magnetic separation operation, the magnetic rod 200 adsorbs lithium nickel cobalt manganese oxide, which serves as the positive electrode active material, from the powdered raw material powder that has been sieved by the sieving mechanism 120. In order to efficiently enable the magnetic rod 200 to adsorb the positive electrode active material, the magnetic rod 200 has, for example, a magnetic field strength and a magnetic field distribution corresponding to the type of the positive electrode active material and the size of the wall 131 of the magnetic separation mechanism 130. The magnetic field strength is, for example, greater than 4000 Gauss, and more preferably greater than 8000 Gauss. In addition, it is also possible to consider providing a plurality of magnetic rods 200 in the magnetic separation mechanism 130 according to the feeding speed of the raw material powder in the magnetic separation device 100, so as to ensure the adsorption of various types of magnetic powder.

[0029] Through the magnetic separation mechanism 130, after the raw material powder is fed once, the magnetic powder and non-magnetic powder in the raw material powder screened by the screening mechanism 120 are separated, the magnetic powder is adsorbed on the magnetic rod 200, and the non-magnetic powder is discharged through the discharge port on the downstream side of the magnetic separation mechanism 130.

[0030] After the magnetic rod 200 adsorbs the magnetic powder, the positive magnetic powder adsorbed on the surface of the magnetic rod 200 is collected. At this time, if the magnetic powder such as the positive active material is in direct contact with the stainless steel surface of the magnetic rod 200, the impact and friction of the magnetic powder during powder collection may easily reduce the service life of the magnetic rod 200 or cause the stainless steel on its surface to be scratched and fall off, introducing new magnetic powder, causing distortion of the magnetic rod verification result.

[0031] In this embodiment, the magnetic bar 200 includes a magnetic bar body 210 and a polymer coating 220 covering the surface of the magnetic bar body 210. The polymer coating 220 prevents the stainless steel surface of the magnetic bar body 210 from directly contacting the magnetic powder, thereby preventing scratches on the stainless steel surface of the magnetic bar body 210, which could reduce the service life of the magnetic bar 200 or distort the magnetic bar verification results.

[0032] Magnetic bar body 210 comprises a magnetic core with magnetic properties and a stainless steel outer shell. The core can be a permanent magnet, such as a magnet, or an electromagnet with an internal conductive winding that magnetizes the core when powered and demagnetizes it when powered off. To facilitate the collection of magnetic powder from magnetic bar 200, magnetic bar 200 preferably employs an electromagnet capable of demagnetizing magnetic bar body 210.

[0033] The material of the polymer coating 220 is not limited. To protect the stainless steel surface of the magnetic bar body 210 and not affect the magnetic field strength and distribution of the magnetic bar 200, polymers such as PP, PE, POE, EVA, and MMA are preferably used. Furthermore, the thickness of the polymer coating 220 is not limited, as long as it can protect the stainless steel surface of the magnetic bar body 210 and not affect the magnetic field strength and distribution of the magnetic bar 200.

[0034] Figure 3A 1 is a schematic diagram showing an embodiment of the present invention before a polymer coating film 220 is coated on a magnetic bar body 210 . Figure 3B Schematic diagram showing an embodiment of the present invention after a polymer coating film 220 is coated on a magnetic rod body 210. Figures 3A-3B As shown, the polymer coating 220 is in the form of a sleeve and can be placed over the magnetic rod body 210. After being placed over the magnetic rod body 210, the polymer coating 220 is fixed to the surface of the magnetic rod body 210 by, for example, a thermoplastic process using a thermoplastic gun. Alternatively, the handle of the magnetic rod body 210 may be provided with a sleeve insertion groove, and the polymer coating 220, serving as a sleeve, may be inserted into the sleeve insertion groove and fixed to the surface of the magnetic rod body 210.

[0035] After a magnetic separation operation is completed, magnetic powder can be easily collected by sampling from the surface of the magnetic bar 200 coated with the polymer coating 220 without damaging the stainless steel surface of the magnetic bar body 210. This prevents scratches on the stainless steel surface from introducing new magnetic powder and distorting the magnetic bar verification results. Furthermore, the polymer coating 220 can be freely removed from the magnetic bar body 210, making it easy to replace the polymer coating 220 and collect magnetic powder.

[0036] In one embodiment, the stainless steel surface of the magnetic rod is heat-shrink wrapped with a polypropylene heat-shrink tube. In the subsequent production report, the number and proportion of stainless steel (SUS) detected in the detection and analysis report of the magnetic separation results are significantly reduced, and after continuous magnetic separation of 1000t of raw material powder, there is no obvious damage to the surface of the magnetic rod body and the coating.

[0037] The embodiments of the present invention have been described above with reference to the accompanying drawings. The embodiments described above are merely specific examples of the present invention, intended for understanding the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art can, based on the technical concept of the present invention, make various modifications, combinations, and reasonable omissions of elements to the embodiments, and the resulting embodiments are also included within the scope of the present invention.

Claims

1. A magnetic bar, characterized in that have: The magnetic rod body has a magnetic core and a stainless steel shell and is used in a magnetic separation device; and The polymer coating film is coated on the surface of the magnetic rod body.

2. The magnetic bar according to claim 1, wherein The polymer coating film serving as a sleeve is fixed to the surface of the magnetic rod body by thermoplasticization.

3. The magnetic bar according to claim 1, wherein The magnetic bar body has a sleeve insertion slot, The polymer coating film serving as a sleeve is inserted into the sleeve insertion groove and fixed to the surface of the magnetic bar body.

4. The magnetic bar according to claim 1, wherein The polymer coating film can be removed relative to the magnetic bar body.

5. The magnetic bar according to any one of claims 1 to 3, wherein The magnetic core of the magnetic bar body is an electromagnet that is magnetized when power is supplied and demagnetized when power is disconnected.

6. A magnetic separation device, characterized in that: have: Feeding port, where raw material powder is fed; A screening mechanism for screening the input raw material powder; and The magnetic separation mechanism is provided with a magnetic rod for collecting magnetic powder, and magnetically separates the magnetic powder in the sieved raw material powder. The magnetic bar has: A magnetic rod body having a magnetic core and a stainless steel shell; and The polymer coating film is coated on the surface of the magnetic rod body.

7. The magnetic separation device according to claim 6, characterized in that The magnetic separation mechanism performs magnetic separation on the positive active material of the ternary lithium battery. The magnetic rod collects the positive electrode active material on the surface of the polymer coating film.

8. The magnetic separation device according to claim 6, characterized in that According to the feeding speed of the raw material powder in the magnetic separation device, a plurality of magnetic bars are arranged in the magnetic separation mechanism.

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