A device for removing conductive impurities from fine powder materials

Abstract

The present invention relates to the field of powder impurity removal, and discloses a device for removing conductive impurities in fine powder materials, comprising: a material falling channel and a mobile magnetic field generator; a mobile magnetic field generator is arranged on one side or both sides of the material falling channel, and the mobile magnetic field generator forms a mobile magnetic field that moves horizontally in the material falling channel. The present invention provides a device for removing conductive impurities in fine powder materials, which realizes the deflection of the moving trajectory of conductive impurities and normal materials during the falling process by setting a mobile magnetic field, thereby realizing separation and removal of conductive impurities, and the removal process is simple and effective; and the device can not only remove iron impurities by using the mobile magnetic field, but also remove metal particles such as copper and zinc that cannot be polarized, which can improve the removal effect of conductive impurities.

Description

Technical Field

[0001] The invention relates to the field of powder impurity removal, in particular to a device for removing conductive impurities in fine powder materials. Background Art

[0002] The requirements for positive electrode materials in the lithium battery industry are: the material is in powder form, with a particle size between 5-15 microns, and the product is directly used in the slurry brushing process of battery manufacturers; the material cannot contain metal crystal particles, otherwise the metal crystal battery will grow from the positive electrode to the negative electrode during multiple charge and discharge processes, forming a short circuit between the positive and negative electrodes, causing the battery to be scrapped. Therefore, the amount of metal crystals directly affects the life and capacity of the battery.

[0003] At present, the removal of metal conductive impurities in fine powder materials mainly uses iron removers to do the final treatment of products that are about to be packaged and shipped, so as to remove metal particles in the products. When the material passes through the iron remover, the electromagnetic coil in the iron remover generates a magnetic field, which is induced on the magnetic core mesh in the middle. When the material passes through the magnetic core mesh, the iron and other magnetizable metal particles in the material are adsorbed, while normal materials are not adsorbed and can pass through the magnetic core mesh and fall directly into the packaging bag.

[0004] After the iron remover has been working for a period of time, more and more high-iron materials are adsorbed on the magnetic core mesh, reducing the iron removal efficiency. It is necessary to turn the discharge of the iron remover to the high-iron material discharge port, and cut off the power to demagnetize, so that the materials adsorbed on the magnetic core mesh fall into the high-iron material collection container, so as to achieve the purpose of separating normal materials from high-iron materials.

[0005] The iron remover can only absorb other tiny particles such as iron that can be magnetized, but it is powerless against metal particles such as copper, zinc, and nickel that are not easily magnetized, and the effect of removing metal impurities is not good. In addition, the efficiency is low, and frequent shutdowns are required to clean high-iron materials. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] The purpose of the present invention is to provide a device for removing conductive impurities in fine powder materials, which is used to solve or partially solve the problem that the existing iron remover can only absorb other tiny particles such as iron that can be magnetized, but is powerless against metal particles such as copper, zinc, nickel that are not easily magnetized, and has a poor effect in removing metal impurities.

[0008] (II) Technical solution

[0009] In order to solve the above technical problems, the present invention provides a device for removing conductive impurities in fine powder materials, comprising: a material falling channel and a mobile magnetic field generator; a mobile magnetic field generator is arranged on one side or both sides of the material falling channel, and the mobile magnetic field generator forms a mobile magnetic field that moves in a horizontal direction in the material falling channel.

[0010] On the basis of the above scheme, the mobile magnetic field generator includes: a silicon steel sheet and a three-phase winding coil; the silicon steel sheet is in the shape of a flat plate and is formed by stacking silicon steel sheets, and a plurality of wire slots are evenly spaced in the horizontal direction on one side of the silicon steel sheet, and the number of the wire slots is a multiple of 3, and the three-phase winding coils are arranged in sequence in the wire slots.

[0011] On the basis of the above scheme, a material inlet is arranged on one side of the top of the material falling channel, a material outlet is arranged on one side of the bottom of the material falling channel, and a first impurity outlet is arranged on the other side; the direction from one side to the other side of the top or bottom of the material falling channel is the moving direction of the moving magnetic field.

[0012] On the basis of the above scheme, it also includes: a silo, a vibrating screen and a guide cover; the silo is used to store materials to be processed, the bottom outlet of the silo is connected to the top inlet of the vibrating screen, and the bottom outlet of the vibrating screen is connected to the material inlet at the top of the material falling channel through the guide cover.

[0013] On the basis of the above solution, a star-shaped feeder is arranged between the bottom outlet of the silo and the top inlet of the vibrating screen, and the star-shaped feeder is connected to the servo motor.

[0014] On the basis of the above scheme, a second impurity outlet is arranged on one side above the screen of the vibrating screen; impurity collectors are arranged below the first impurity outlet and the second impurity outlet respectively; and a material collector is arranged below the material outlet.

[0015] On the basis of the above solution, the material outlet is connected to a discharge channel, and the cross-sectional area of ​​the discharge channel gradually decreases from top to bottom.

[0016] On the basis of the above solution, a heat sink is arranged on the outside of the moving magnetic field generator.

[0017] On the basis of the above solution, the three-phase winding coil is connected to a frequency converter, and the moving speed of the moving magnetic field is controlled by the frequency converter.

[0018] On the basis of the above scheme, it also includes: a supporting platform; the silo, the vibrating screen and the mobile magnetic field generator are fixed by the supporting platform.

[0019] (III) Beneficial effects

[0020] The present invention provides a device for removing conductive impurities from fine powder materials. A moving magnetic field is set to achieve the deflection of the motion trajectories of conductive impurities and normal materials during the falling process, thereby realizing separation and removal of conductive impurities. The removal process is simple and effective. The device utilizes the moving magnetic field to remove not only iron impurities but also metal particles such as copper and zinc that cannot be polarized, thereby improving the removal effect of conductive impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a device for removing conductive impurities from fine powder materials according to an embodiment of the present invention;

[0022] Figure 2 A side view of a device for removing conductive impurities from fine powder materials according to an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of a magnetic field generator in an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1—Support platform; 2—Materials bin; 3—Star-shaped feeder;

[0026] 4—Servo motor; 5—Vibrating screen; 6—Flow guide cover;

[0027] 7—magnetic field generator; 8—radiator; 9—material collector;

[0028] 10—impurity collector; 11—discharging channel; 12—impurity outlet channel;

[0029] 13—second impurity outlet; 14—material falling channel; 15—silicon steel sheet;

[0030] 16—Wire slot; 17—Three-phase winding coil. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] According to an embodiment of the present invention, a device for removing conductive impurities in fine powder material is provided. Figure 1 The device includes: a material falling channel 14 and a mobile magnetic field generator 7; the mobile magnetic field generator 7 is arranged on one side or both sides of the material falling channel 14, and the mobile magnetic field generator 7 forms a mobile magnetic field that moves in the horizontal direction in the material falling channel 14.

[0034] This embodiment provides a device for removing conductive impurities from fine powder materials, and proposes to set a moving magnetic field to separate the materials and the conductive impurities. The moving magnetic field moves in a horizontal direction, and the materials to be processed can be dropped from the material drop channel 14.

[0035] When the material to be processed falls freely, the conductive impurity particles will be deflected in the same direction as the horizontal moving magnetic field under the action of the horizontal moving magnetic field. That is, the conductive impurity particles will move horizontally along the moving direction of the moving magnetic field. Normal materials, as insulating particles, are not affected by the magnetic field and still fall vertically. Thus, the separation of normal materials and conductive impurity particles is achieved.

[0036] The principle of the action of dynamic magnetic field on conductive particles is: the conductor is cutting the magnetic lines of force in the moving magnetic field. When the conductor cuts the magnetic lines of force, it will induce electromotive force, that is, electromagnetic induction phenomenon, and the common application is the generator. The current flows inside the conductor, forming a magnetic field, and the two magnetic fields interact to generate force, and the common application is the dragon motor, which completes the function of pulling and separating the conductive impurity particles in the material.

[0037] The present embodiment provides a device for removing conductive impurities from fine powder materials. A moving magnetic field is set to deflect the motion trajectories of conductive impurities and normal materials during the falling process, thereby separating and removing the conductive impurities. The removal process is simple and effective. The device utilizes a moving magnetic field to remove not only iron impurities but also metal particles such as copper and zinc that cannot be polarized, thereby improving the removal effect of conductive impurities.

[0038] Furthermore, the device is used to remove conductive impurities in the positive electrode material of the battery, which can improve the removal efficiency and increase the service life of the battery.

[0039] On the basis of the above embodiment, this embodiment further describes the specific configuration of the mobile magnetic field generator 7. Figure 3 The mobile magnetic field generator 7 includes a silicon steel sheet 15 and a three-phase winding coil 17. The silicon steel sheet 15 is in a flat plate shape and is formed by stacking silicon steel sheets.

[0040] A plurality of wire grooves 16 are evenly spaced in the horizontal direction on one side of the silicon steel sheet 15. That is, the plurality of wire grooves 16 are evenly spaced in the horizontal direction, and there is a gap between two adjacent wire grooves 16. Preferably, the silicon steel sheet 15 can be vertically arranged. And each wire groove 16 is arranged in the vertical direction. The wire groove 16 is a groove located on the surface of the silicon steel sheet 15, and a coil can be placed.

[0041] The number of the wire slots 16 is a multiple of 3, and the three-phase winding coils 17 are sequentially arranged in the wire slots 16. The three-phase winding coils 17 include three groups of windings, and one end of the three groups of windings is connected to the three-phase power of ABC respectively. That is, the three-phase winding coils 17 include the A-phase winding, the B-phase winding, and the C-phase winding connected to the three-phase power.

[0042] Each phase winding includes multiple coils. That is, the A-phase winding includes multiple A-phase coils; the B-phase winding includes multiple B-phase coils; and the C-phase winding includes multiple C-phase coils. In all the slots 16, the first A-phase coil in the A-phase winding in the horizontal direction is wound in the first slot 16 and the fourth slot 16; the second A-phase coil is wound in the fourth slot 16 and the seventh slot 16; and so on.

[0043] The first B-phase coil in the B-phase winding is wound in the second wire slot 16 and the fifth wire slot 16; the second B-phase coil is wound in the fifth wire slot 16 and the eighth wire slot 16; and so on.

[0044] The first C-phase coil in the C-phase winding is wound in the third wire slot 16 and the sixth wire slot 16; the second C-phase coil is wound in the sixth wire slot 16 and the ninth wire slot 16; and so on. In this way, since the magnetic fields partially overlap, the continuous movement of the magnetic fields can be guaranteed.

[0045] One end of the first coil in the A-phase winding is connected to the A-phase electrical phase, and the other end is connected to one end of the second coil in the A-phase winding, and so on. That is, the multiple coils in the A-phase winding are connected in series end to end.

[0046] At the same time, one end of the first coil of the B-phase winding is connected to the B-phase electrical phase, and the other end is connected to one end of the second coil of the B-phase winding, and so on. That is, the multiple coils in the B-phase winding are connected in series end to end.

[0047] One end of the first coil of the C phase winding is electrically connected to the C phase, and the other end is connected to one end of the second coil of the C phase winding, and so on. That is, the multiple coils in the C phase winding are connected in series end to end.

[0048] The suspended end of the last coil of each phase winding can be connected together to form a star connection, or the last suspended end of the A phase winding is electrically connected to the B phase, and the suspended end of the last coil of the B phase winding is electrically connected to the C phase. The suspended end of the last coil of the C phase winding is electrically connected to the A phase to form a triangle connection.

[0049] After the three-phase winding coil 17 is connected to the three-phase power, a simulated horizontal moving electromagnetic field is generated on one side of the silicon steel plate 15 where the three-phase winding coil 17 is set. The moving direction of the moving magnetic field is from A to B to C.

[0050] The reason why silicon steel sheets are pressed into a skeleton is that silicon steel generates a magnetic field when there is electricity, and quickly demagnetizes when there is no electricity. In this way, under the action of three-phase electricity, a moving magnetic field effect can be generated. The silicon steel sheets are to prevent the electromagnetic field from generating eddy currents on the skeleton and generating high temperatures, which can damage the skeleton.

[0051] Furthermore, the silicon steel sheet plate 15 is formed by stacking silicon steel sheets. Specifically, the silicon steel sheet plate 15 is formed by stacking a plurality of silicon steel sheets. A groove shape can be punched out on each silicon steel sheet. A plurality of silicon steel sheets are stacked up and down and the groove positions correspond to each other. The grooves on the plurality of silicon steel sheets are connected to form the wire slot 16.

[0052] On the basis of the above embodiment, this embodiment further specifically describes the setting of the inlet and outlet of the material falling channel 14. The material to be processed enters from the top of the material falling channel 14 and falls from the bottom. A material inlet is set on one side of the top of the material falling channel 14. The material inlet is the entrance for the material to be processed to enter the material falling channel 14. The material inlet should be located at the starting point of the moving direction of the magnetic field.

[0053] A material outlet is provided at one side of the bottom end of the material falling channel 14. The material outlet refers to the outlet of normal materials after passing through the material falling channel 14. Normal materials will fall vertically in free fall motion because they are not affected by the magnetic field. The material outlet is located on the same side as the material inlet, and both are located at the starting point of the moving direction of the moving magnetic field.

[0054] A first impurity outlet is provided on the other side of the bottom of the material falling channel 14. The first impurity outlet is an outlet for conductive impurities in the material to be processed. When the material to be processed falls in the material falling channel 14, the conductive impurities will be horizontally deflected following the moving direction of the moving magnetic field, thereby being separated from the normal material.

[0055] The direction from one side to the other side of the top or bottom of the material falling channel 14 is the moving direction of the moving magnetic field. That is, the direction from the material outlet at the bottom of the material falling channel 14 to the first impurity outlet is the moving direction of the moving magnetic field.

[0056] On the basis of the above embodiment, further, a device for removing conductive impurities in fine powder material also includes: a silo 2, a vibrating screen 5 and a guide cover 6. The silo 2 is used to store the material to be processed. The top of the silo 2 is provided with an inlet for the material to be processed. The bottom of the silo 2 is provided with an outlet for the material to be processed. The outlet at the bottom of the silo 2 is connected to the top inlet of the vibrating screen 5. The bottom outlet of the vibrating screen 5 is connected to the material inlet at the top of the material falling channel 14 through the guide cover 6.

[0057] Before the material to be processed enters the material falling channel 14 for impurity separation, the material to be processed is first transported to the high silo 2. The material is quantitatively dropped into the vibrating screen 5 by free fall. The vibrating screen 5 first removes the oversized impurities in the material to be processed, and at the same time disperses the material to facilitate the removal of conductive impurities in the next step. The loose material passing through the vibrating screen 5 can evenly fall into the material falling channel 14.

[0058] On the basis of the above embodiment, further, a star-shaped feeder 3 is arranged between the bottom outlet of the silo 2 and the top inlet of the vibrating screen 5, and the star-shaped feeder 3 is connected to the servo motor 4. The servo motor 4 drives the star-shaped feeder 3 to feed the vibrating screen 5 uniformly and quantitatively to ensure the stability of subsequent work. By controlling the rotation speed of the star-shaped feeder 3 and the feeding speed, the processing speed and quality of the material are ensured to reach the best state.

[0059] On the basis of the above embodiment, further, a second impurity outlet 13 is provided on one side above the screen of the vibrating screen 5; large particle impurities screened out by the vibrating screen 5 can be discharged from the vibrating screen 5 through the second impurity outlet 13 during the vibration of the vibrating screen 5. Impurity collectors 10 are provided below the first impurity outlet and the second impurity outlet 13 respectively; conductive impurities and large particle impurities are collected respectively. A material collector 9 is provided below the material outlet to collect normal materials.

[0060] On the basis of the above embodiment, further, the material outlet is connected to the discharge channel 11, and the cross-sectional area of ​​the discharge channel 11 gradually decreases from top to bottom. The top cross-sectional area of ​​the discharge channel 11 is larger, that is, the width along the moving direction of the moving magnetic field is larger, which is convenient for ensuring that normal materials fall into the discharge channel 11 during the falling process. The bottom cross-sectional area of ​​the discharge channel 11 is smaller, that is, the width along the moving direction of the moving magnetic field is smaller, which is convenient for normal materials to fall into the material collector 9 and avoid material spillage.

[0061] The impurity collector 10 and the material collector 9 can realize the separation of normal materials and impurities while collecting normal materials and impurities, which can ensure the continuous and stable operation of the device; at the same time, the conductive impurities are collected, which is also convenient for the recovery and treatment of the conductive impurities.

[0062] Further, the first impurity outlet at the bottom of the material falling channel 14 can be connected to the impurity outlet channel 12. The top of the discharge channel 11 at the bottom of the material falling channel 14 can be connected to the top of the impurity outlet channel 12. And the width of the discharge channel 11 at the bottom of the material falling channel 14 can be greater than the width of the first impurity outlet channel 12.

[0063] On the basis of the above embodiments, further, referring to Figure 2 , a radiator 8 is arranged on the outer side of the mobile magnetic field generator 7. The radiator 8 can dissipate heat and cool the mobile magnetic field generator 7 to ensure its normal operation.

[0064] On the basis of the above embodiment, the three-phase winding coil 17 is further connected to the frequency converter, and the moving speed of the moving magnetic field is controlled by the frequency converter. By adjusting the output frequency of the frequency converter, the horizontal moving speed of the moving magnetic field is controlled to adjust the loss of the material. If the moving speed of the moving magnetic field is too fast, a large amount of normal material is easily taken away due to physical impact; if the speed is too slow, the removal effect does not meet the requirements and effective separation and removal cannot be achieved.

[0065] On the basis of the above embodiments, further, a device for removing conductive impurities in fine powder materials also includes: a support platform 1; a silo 2, a vibrating screen 5 and a mobile magnetic field generator 7 are fixed by the support platform 1.

[0066] On the basis of the above embodiments, further, a device for removing conductive impurities from fine powder materials can be applied to industries that require that the powder materials of lithium battery positive electrode materials, i.e. insulating materials, etc., be free of conductive impurity particles.

[0067] The device changes the static magnetic field in the traditional system for removing metal impurities into a horizontal transverse moving magnetic field perpendicular to the falling direction of the material. When the material containing conductive particles is in free fall, the conductive particles are deflected in the same direction as the transverse moving magnetic field under the action of the transverse moving magnetic field. Normal materials are insulating particles and are not affected by the magnetic field and still fall vertically, so as to achieve the purpose of separating and removing normal materials from conductive particles.

[0068] The specific process of removing conductive impurities by the device is as follows: the vibrating screen 5 has the function of dispersing the powdered material, and guides the dispersed material to the entrance of the moving magnetic field through the guide cover 6. The moving magnetic field generator 7 of the transverse moving magnetic field generates a transverse moving magnetic field perpendicular to the falling direction of the material. After the material passes through the transverse moving magnetic field, it is divided into two flow directions. The normal material falls vertically and enters the normal material collection container, and the conductive particles enter the impurity collection container due to deflection. The material processing is completed.

[0069] The transverse moving magnetic field generator 7 is mainly a flat plate formed by laminating silicon steel sheets, and a uniform wire slot 16 is punched on the plane of one side. A three-phase winding coil 17 is placed in the wire slot 16. After the coil is connected to the three-phase power, a simulated transverse moving electromagnetic field, that is, perpendicular to the gravity, is generated on one side of the flat plate with the winding coil.

[0070] The device can remove copper, zinc and other metal particles that cannot be polarized and cannot be removed by the original static magnetic field, thereby improving the removal effect of metal impurities and increasing the service life of the battery. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for removing conductive impurities from fine powder of positive electrode material, characterized in that: include: A material falling channel and a moving magnetic field generator; a moving magnetic field generator is arranged on one side or both sides of the material falling channel, and the moving magnetic field generator forms a moving magnetic field moving in a horizontal direction in the material falling channel; The mobile magnetic field generator comprises: a silicon steel plate and a three-phase winding coil; the silicon steel plate is in a flat plate shape and is formed by stacking silicon steel sheets, a plurality of wire slots are evenly spaced in the horizontal direction on one side of the silicon steel plate, the number of the wire slots is a multiple of 3, and the three-phase winding coils are sequentially arranged and placed in the wire slots; The three-phase winding coil includes an A-phase winding, a B-phase winding and a C-phase winding connected to the three-phase electrical phases. The A-phase winding includes a plurality of A-phase coils, which are connected in series end to end. The B-phase winding includes a plurality of B-phase coils, which are connected in series end to end. The C-phase winding includes a plurality of C-phase coils, which are connected in series end to end. In all the slots, the first A-phase coil in the A-phase winding is in the first slot 16 and the fourth slot 16 along the horizontal direction. Winding; the second A-phase coil is wound in the fourth wire slot 16 and the seventh wire slot 16; by analogy, the first B-phase coil in the B-phase winding is wound in the second wire slot 16 and the fifth wire slot 16; the second B-phase coil is wound in the fifth wire slot 16 and the eighth wire slot 16; by analogy, the first C-phase coil in the C-phase winding is wound in the third wire slot 16 and the sixth wire slot 16; the second C-phase coil is wound in the sixth wire slot 16 and the ninth wire slot 16; and so on; Wherein, the particle size of the positive electrode material subdivided material is between 5 and 15 microns.

2. The device for removing conductive impurities from fine powder materials according to claim 1, characterized in that: A material inlet is arranged on one side of the top of the material falling channel, a material outlet is arranged on one side of the bottom of the material falling channel, and a first impurity outlet is arranged on the other side; the direction from one side to the other side of the top or bottom of the material falling channel is the moving direction of the moving magnetic field.

3. The device for removing conductive impurities from fine powder materials according to claim 2, characterized in that: Also includes: Silos, vibrating screens and shrouds; The silo is used to store materials to be processed, the bottom outlet of the silo is connected to the top inlet of the vibrating screen, and the bottom outlet of the vibrating screen is connected to the material inlet at the top of the material falling channel through a guide cover.

4. The device for removing conductive impurities from fine powder materials according to claim 3, characterized in that: A star-shaped feeder is arranged between the bottom outlet of the silo and the top inlet of the vibrating screen, and the star-shaped feeder is connected to the servo motor.

5. The device for removing conductive impurities from fine powder materials according to claim 3, characterized in that: A second impurity outlet is arranged on one side above the screen of the vibrating screen; impurity collectors are arranged below the first impurity outlet and the second impurity outlet respectively; and a material collector is arranged below the material outlet.

6. The device for removing conductive impurities from fine powder materials according to claim 2, characterized in that: The material outlet is connected to a discharge channel, and the cross-sectional area of ​​the discharge channel gradually decreases from top to bottom.

7. The device for removing conductive impurities from fine powder materials according to claim 2, characterized in that: A heat sink is arranged outside the moving magnetic field generator.

8. The device for removing conductive impurities from fine powder materials according to claim 1, characterized in that: The three-phase winding coil is connected to a frequency converter, and the moving speed of the moving magnetic field is controlled by the frequency converter.

9. The device for removing conductive impurities from fine powder materials according to claim 3, characterized in that: Also includes: Support platform; the silo, vibrating screen and mobile magnetic field generator are fixed by the support platform.

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