Powder particle stratified fluidized collision charging device, method and charged powder particle

Abstract

The present invention provides a powder particle stratified fluidized collision charging device, method and charged powder particles, including a disturbance mechanism, a charged screening mechanism and a feeding structure; the disturbance mechanism is used to provide a disturbed airflow to the charged screening mechanism; the fixed screen plate is arranged near the bottom of the friction charging cylinder; the blocking screen plate is arranged at the center of the friction charging cylinder; the outlet pipe is located at the top of the friction charging cylinder; the fixed screen plate, the blocking screen plate and the friction charging cylinder constitute a first screening chamber, which is used to crush and disperse the powder particles to form small-sized charged powder particles; the blocking screen plate and the top plate of the friction charging cylinder constitute a second screening chamber, which is used to complete the second charging of the small-sized charged powder particles entering therein and escape from the outlet pipe. The device of the present invention uses fluidized stratification and airflow disturbance to perform friction collision charging on the powder particles, which can enhance the friction charging effect of the powder particles and achieve stable charging of the powder particles.

Description

Technical Field

[0001] The invention relates to the technical field of electrostatic separation, and in particular to a powder particle stratified fluidized collision charging device, method and charged powder particles. Background Art

[0002] Electrostatic separation technology is a technology that uses electrostatic phenomena to separate and purify substances. It uses the differences in conductivity, dielectric constant and work function between substances to make different substances in the sorted materials carry different charges, and then sort them in a high-voltage electric field to obtain graded materials. Electrostatic separation technology belongs to dry sorting, which has low pollution, low water consumption during the sorting process, simple process and easy operation. It has obvious advantages in the development and utilization of resources in water-scarce areas.

[0003] Electrostatic sorting technology includes two steps: charging and separation. Charging is the prerequisite for sorting, ensuring that the powder particles carry sufficient charge. Common charging methods include friction charging, induction charging and corona charging. Corona charging and induction charging are based on the difference in conductivity of the sorted materials, and are usually suitable for sorting between conductors and non-conductor materials. When the sorted materials are food or medicines, the corona electric field will destroy the surface properties of the materials. When the sorted materials are particulate matter, since the particle size is an important factor affecting charging, corona charging and induction charging technologies are generally suitable for sorting materials with a particle size greater than 100μm. For fine particles with smaller particle sizes, fine particles are easily adsorbed and agglomerated, resulting in the particles not being fully exposed, and the charge transfer of the particles is inhibited, so the charging effect is poor. Therefore, when charging and sorting powder particles, friction charging is generally used.

[0004] Tribocharging has a wide range of applications and has a good charging effect on fine particles. Select appropriate friction materials and use the difference in work function between the friction material and the sorted material to charge the particles. Tribocharging is performed through contact and collision between material particles, which can avoid agglomeration between fine particles and make the material particles fully charged. Common devices for tribocharging include solid-state single-phase charging devices and gas-solid two-phase charging devices. Solid-state single-phase charging devices rely on friction collision between particles to charge, such as rollers and vibration devices; gas-solid two-phase charging devices use airflow to assist particle collision and friction charging, such as cyclone chargers and fluidized beds. Traditional tribocharging devices charge the screened particles by collision, ignoring the effect of particle crushing on charging. In addition, the powder particles leave the charging device after a single charge, which also reduces the charge of small-size particles. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a powder particle stratified fluidized collision charging device, method and charged powder particles.

[0006] The technical solution of the present invention is:

[0007] A powder particle stratified fluidized collision charging device comprises a disturbance mechanism, a charging screening mechanism and a feeding mechanism; the disturbance mechanism is used to provide a disturbed airflow to the charging screening mechanism; the charging screening mechanism comprises a friction charging cylinder, a fixed screen plate, a blocking screen plate and an outlet pipe; the fixed screen plate is arranged near the bottom of the friction charging cylinder; the blocking screen plate is arranged at the center of the friction charging cylinder; the outlet pipe is located at the top of the friction charging cylinder; the fixed screen plate, the blocking screen plate and the friction charging cylinder constitute a first screening chamber, which is used to crush and disperse the powder particles entering therein to form small-size powder particles and complete the first charging of the powder particles; the blocking screen plate and the top plate of the friction charging cylinder constitute a second screening chamber, which is used to complete the second charging of the powder particles entering therein and escape from the outlet pipe with the disturbed airflow; the feeding mechanism is used to transport the powder particles to the first screening chamber.

[0008] Furthermore, the disturbance mechanism includes a fan and an air inlet pipe, the air inlet pipe connects the fan and the bottom of the friction charging cylinder, and is used to transport the airflow provided by the fan to the friction charging cylinder; a neck tube is provided at the bottom end of the friction charging cylinder, the neck tube is trumpet-shaped, and is connected to the air inlet pipe, and is used to enhance the air flow speed entering the friction charging cylinder.

[0009] Furthermore, a necked tube is provided at the top end of the outlet tube, and the necked tube is trumpet-shaped.

[0010] Furthermore, the feeding mechanism includes a loader, a hopper, a screw feeder and a conveying pipe; one end of the conveying pipe is connected to the screw feeder, and the other end extends into the first screening chamber, and a discharge port is arranged near the free end; the loader is used to convey the powder and granular material to the hopper, and then the powder and granular material is transported from the conveying pipe to the first screening chamber via the screw feeder.

[0011] Further, the blocking screen plate is installed at the center position of the height of the friction charging cylinder;

[0012] The net height of the first screening chamber is approximately equal to the diameter of the tribocharge cylinder;

[0013] The feeding port of the feeding mechanism is located in the first screening chamber, and the distance between the feeding port and the axis of the triboelectric cylinder is 17% to 30% of the diameter of the triboelectric cylinder, preferably 25%;

[0014] The distance between the feeding port of the feeding mechanism and the bottom surface of the blocking screen plate is 10% to 20% of the indoor height of the first screening chamber, preferably 17%;

[0015] The distance between the bottom surface of the fixed sieve plate and the bottom end surface of the friction charging cylinder is proportional to the diameter of the friction charging cylinder, and the distance is not less than 6 cm, and the sum of the distance and the length of the necking tube is not greater than the net height of the first screening chamber.

[0016] Furthermore, a valve is provided on the conveying pipe, and the amount of powder particles fed into the first screening chamber is controlled by adjusting the opening and closing angle of the valve; a notch is provided on the pipeline of the conveying pipe located inside the first screening chamber.

[0017] Furthermore, the fixed sieve plate and the blocking sieve plate are made of insulating materials; the mesh diameter of the fixed sieve plate is 0.2-0.7 mm; the mesh diameter of the blocking sieve plate is 0.1-0.5 mm; and the mesh diameter of the fixed sieve plate is larger than the mesh diameter of the blocking sieve plate.

[0018] Furthermore, the outlet pipe is arranged in a trapezoidal shape, and its large-diameter end is connected to the top end of the friction charging cylinder through a flange.

[0019] Furthermore, a third sieve plate is provided on the top of the friction charging cylinder, and the mesh diameter of the third sieve plate is set to 0.07-0.1 mm.

[0020] Furthermore, a third sieve plate may be provided at the top of the friction charging cylinder near the outlet pipe, and the mesh diameter of the third sieve plate is set to 0.07-0.1 mm, preferably 0.074 mm, for further screening the powder particles; or 0.11-0.5 mm, preferably 0.4 mm, for keeping the powder particles dispersed when escaping.

[0021] A powder particle stratified fluidized collision charging method comprises the following steps:

[0022] S1, start the disturbance mechanism to operate and output the disturbed airflow, specifically: turn on the fan, and the airflow is sent into the friction charging cylinder from the bottom end of the friction charging cylinder through the air inlet pipe;

[0023] S2, the feeding mechanism operates to feed a set amount of powder and granular raw materials to the charged screening mechanism, specifically: the feeder feeds the powder and granular raw materials into the hopper, the hopper conveys the powder and granular raw materials to the screw feeder, and the screw feeder conveys the powder and granular raw materials to the first screening chamber through the conveying pipe;

[0024] S3, the powder particle raw material is charged by friction collision for the first time in the first screening chamber of the charged screening mechanism under the action of air flow disturbance. In this process, large-sized powder particles and agglomerated powder particle clusters are crushed and dispersed to form small-sized powder particles;

[0025] S4, under the action of air flow disturbance, the small-size powder particles are screened by the blocking screen plate of the charged screening mechanism and enter the second screening chamber;

[0026] S5, the small-size powder particles are further subjected to a second friction collision charging in the second screening chamber under the action of the airflow, and the powder particles after two collision chargings escape from the outlet pipe along with the airflow.

[0027] Furthermore, the wind speed of the disturbed airflow is set in the range of 5 to 20 m / s.

[0028] Furthermore, the particle size of the powder particle raw material is set in the range of 1 to 100 μm.

[0029] The present invention utilizes the above-mentioned device and method to obtain a layered fluidized collision charged powder particle, wherein the ignition loss of the positive and negative electrode products of the charged powder particle are 12.77% and 44.40% respectively.

[0030] The beneficial effects of the present invention are:

[0031] The present invention adopts fluidization stratification and air flow disturbance to perform friction collision charging on powder particles.

[0032] The present invention arranges a fixed sieve plate and a blocking sieve plate in the friction charging cylinder along the running direction of powder particles to form a first sieving chamber and a second sieving chamber.

[0033] The airflow passes through the fixed sieve plate and enters the first screening chamber. The fixed sieve plate allows the airflow to act more evenly on the powder particles. When the powder particles enter the first screening chamber, they are disturbed by the airflow, which produces a dispersion effect. Under the disturbance of the airflow, they collide with the friction charging cylinder and are charged. Under the action of the fixed sieve plate, the powder particles are broken into powder particles with smaller particle sizes.

[0034] The charged particles after crushing are screened by the blocking screen plate and enter the second screening chamber, so that the crushed particles are further charged;

[0035] The present invention charges the powder particles multiple times in the friction charging cylinder and takes into account the influence of particle crushing on charging, thereby enhancing the charge amount of particles with small particle sizes.

[0036] The present invention has a simple operation process and can enhance the friction charging effect of powder particles to achieve stable charging of powder particles. The obtained positive and negative electrode products of charged powder particles have obvious differences in ignition loss, which is beneficial to their later sorting. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 : Schematic diagram of the structure of the powder particle stratified fluidized collision charging device;

[0038] Figure 2: Schematic diagram of the dimensions and positions of relevant components of the powder particle stratified fluidized collision charging device.

[0039] Explanation of symbols

[0040] 1-fan, 2-air inlet pipe, 3-friction charging cylinder, 4-fixed screen plate, 5-blocking screen plate, 6-flange, 7-outlet pipe, 8-loader, 9-hopper, 10-screw feeder, 11-conveying pipe, 12-necked pipe. DETAILED DESCRIPTION

[0041] The present invention is described in detail below by way of embodiments in conjunction with the accompanying drawings.

[0042] As attached Figure 1 As shown, the present invention describes a powder particle stratified fluidized collision charging device, which includes a disturbance mechanism, a charging screening mechanism and a feeding mechanism.

[0043] The disturbance mechanism preferably uses a fan 1. The fan 1 is connected to the friction charging cylinder 3 through an air inlet pipe 2, and is used to provide a disturbed airflow to the charged screening mechanism.

[0044] The charged screening mechanism includes a friction charging cylinder 3, a fixed sieve plate 4 and a blocking sieve plate 5. The fixed sieve plate 4, the blocking sieve plate 5 and the friction charging cylinder 3 constitute a first screening chamber, and the net height of the first screening chamber is approximately equal to the diameter of the friction charging cylinder 3; the blocking sieve plate 5 and the friction charging cylinder 3 constitute a second screening chamber.

[0045] The blocking screen plate 5 is arranged at the center of the friction charging cylinder 3 .

[0046] The fixed sieve plate 4 is arranged close to the bottom of the friction charging cylinder 3. The distance between the bottom surface of the fixed sieve plate 4 and the bottom end surface of the friction charging cylinder 3 is proportional to the diameter of the friction charging cylinder 3. The distance is not less than 6 cm, and the sum of the length of the fixed sieve plate 4 and the length of the necking tube 12 is not greater than the net height of the first screening chamber.

[0047] The charging screening mechanism further comprises an outlet pipe 7 , which is arranged in a trapezoidal shape, and the large-diameter end of the outlet pipe 7 is connected to the top end of the friction charging cylinder 3 via a flange 6 .

[0048] The feeding mechanism includes a feeder 8 , a hopper 9 , a screw feeder 10 and a conveying pipe 11 .

[0049] The feeder 8 conveys the powder and granular materials to the hopper 9 , and then the screw feeder 10 transports the powder and granular materials through the conveying pipe 11 to the first screening chamber.

[0050] The conveying pipe 11 passes through the side wall of the tribocharge cylinder 3, and the distance between the feeding port thereof located in the first screening chamber and the axis of the tribocharge cylinder is 25% of the diameter of the tribocharge cylinder.

[0051] The conveying pipe 11 is located below the blocking screen plate 5, and the distance between the discharge port of the conveying pipe 11 and the bottom surface of the blocking screen plate 5 is 17% of the indoor height of the first screening chamber.

[0052] In the above embodiment, as a preferred method:

[0053] 1. A valve is provided on the conveying pipe 11 located outside the tribocharging cylinder 3. The feeding amount of the powder particles entering the tribocharging cylinder 3 is controlled by adjusting the opening and closing angle of the valve.

[0054] 2. The conveying pipe 11 is located inside the friction charging cylinder 3 and has a notch to increase the amount of powder particles discharged.

[0055] 3. The bottom end of the tribocharged cylinder 3 and the top end of the outlet pipe 7 are respectively provided with a necking tube 12, which is trumpet-shaped, and the angle between its inclined surface and the cylinder wall of the tribocharged cylinder 3 is 91° to 179°, preferably 120° to 160°. The necking tube 12 at the top is connected to the outlet pipe 7, and the necking tube 12 at the bottom is connected to the air inlet pipe 2. The necking tube 12 at the bottom is used to increase the air flow velocity entering the tribocharged cylinder 3. Its setting plays a guiding role in the air flow, so that the air flow can diffuse from the center of the tribocharged cylinder 3 to the surroundings along the inner inclined surface of the necking tube, so that the air flow evenly enters the first screening chamber, prevents the formation of air flow dead angles around the first screening chamber, and can also prevent powder particles from being deposited at the bottom of the tribocharged cylinder 3. The necking tube 12 at the top guides the escape of powder particles and prevents them from being blocked when escaping.

[0056] 4. The fixed sieve plate 4 and the blocking sieve plate 5 are both made of insulating materials, such as ceramics, nylon, etc., to avoid affecting the charging of powder particles.

[0057] 5. The mesh diameter of the fixed sieve plate 4 is set to 0.2-0.7 mm, preferably 0.6 mm; the mesh diameter of the blocking sieve plate 5 is set to 0.1-0.5 mm, preferably 0.4 mm. In addition, the mesh diameter of the fixed sieve plate 4 should be larger than the mesh diameter of the blocking sieve plate 5.

[0058] 6. The fixed sieve plate 4 and the blocking sieve plate 5 are both configured to be detachably connected to the friction charging cylinder 3, and can meet different powder particle charging and screening operation requirements by changing their respective sieve hole sizes.

[0059] Based on the above powder particle stratified fluidized collision charging device, the present invention also describes a powder particle stratified fluidized collision charging method, comprising the following steps:

[0060] S1, start the disturbance mechanism and output the disturbance airflow, and the wind speed of the disturbance airflow is controlled in the range of 5 to 20 m / s. Here, when the wind speed is lower than 5 m / s, the powder particles cannot obtain sufficient kinetic energy in the charged screening mechanism, which is not conducive to the formation of effective collision charging in the charged screening mechanism; when the wind speed is higher than 20 m / s, some powder particles that cannot be effectively or fully collision-charged will escape from the charged screening mechanism with the airflow.

[0061] Specifically, the fan 1 is turned on, and the air flow is sent into the friction charging cylinder 3 from the bottom end of the friction charging cylinder 3 through the air inlet pipe 2.

[0062] Under different disturbance gas velocities, the particle stratified fluidization collision charging effect is obvious. Compared with the original uncharged particles, the average charge-to-mass ratio of particles after stratified fluidization first increases and then decreases with the increase of disturbance gas velocity. The effect of wind speed on the average charge-to-mass ratio of particles after stratified fluidization is shown in Table 1.

[0063] Table 1

[0064]

[0065] It can be seen from the above table that the appropriate disturbance air velocity is 5 to 20 m / s.

[0066] S2, the feeding mechanism operates to feed a set amount of powder and granular raw materials into the charged screening mechanism.

[0067] Specifically, the feeder 8 puts the powder and granular raw materials into the hopper 9 , the hopper 9 conveys the powder and granular raw materials to the screw feeder 10 , and the screw feeder 10 conveys the powder and granular raw materials to the first screening chamber through the conveying pipe 11 .

[0068] Here, the particle size of the powder particle raw material is preset to be in the range of 1 to 100 μm.

[0069] S3, under the action of air flow disturbance, the powder particle raw material undergoes the first friction collision charging inside the first screening chamber of the charged screening mechanism. During this process, large-sized powder particles and agglomerated powder particle clusters are crushed and dispersed to form small-sized powder particles.

[0070] S4, under the action of air flow disturbance, the small-size powder particles are screened by the blocking screen plate 5 of the charged screening mechanism and enter the second screening chamber.

[0071] S5, the powder particles are further subjected to a second friction collision charging in the second screening chamber under the action of the airflow. After two collision chargings, the powder particles escape from the outlet pipe 7 along with the airflow.

[0072] In the above steps,

[0073] 1. The powder particles undergo two friction charging processes, but according to the needs of actual operations, the number of blocking screen plates can be increased in the charging screening mechanism.

[0074] 2. A third sieve plate may be provided at the top of the friction charging cylinder 3, i.e., near the outlet pipe 7; the mesh diameter of the third sieve plate is set to 0.07-0.1 mm, preferably 0.074 mm, for further screening the powder particles; or 0.11-0.5 mm, preferably 0.4 mm, for keeping the powder particles dispersed when escaping.

[0075] 3. The third sieve plates are all configured to be detachably connected to the friction charging cylinder 3, and can meet different operating requirements by changing the size of the sieve holes.

[0076] During the above operation, the distance H5 between the bottom surface of the fixed sieve plate 4 and the bottom end surface of the friction charging cylinder 3, the axial distance W1 between the discharge port of the conveying pipe and the friction charging cylinder 3, and the distance H6 between the discharge port of the conveying pipe and the bottom surface of the blocking sieve plate 5 have a more intuitive influence on the dispersion and charging effect of the powder particles during the charging treatment process, which will be further explained in conjunction with specific embodiments below.

[0077] In this embodiment, the inner diameter of the friction charging cylinder selected is D1=60 cm , length H1= 140 cm; inner diameter D2 of outlet pipe 7 = 60 cm, length H2= 25 cm; the internal length H3 of the diameter reduction tube 12 = 35 cm; Net height of the first screening chamber H4 = 60 According to the size of the device of the present invention, four sets of data were set for experiment, and the results are shown in Table 2.

[0078] Table 2

[0079]

[0080] It can be seen from Table 2 that under the same wind speed conditions, the setting of the fourth group of data, that is, when the bottom surface of the fixed sieve plate 4 is 10 cm away from the bottom end surface of the friction charging cylinder 3, the discharge port of the conveying pipe is 15 cm away from the axis of the friction charging cylinder 3, and the discharge port of the conveying pipe is 10 cm away from the bottom surface of the blocking sieve plate 5, can play a role in uniform and stable gas distribution, and can fully disperse the powder particles to avoid local particle accumulation and accumulation.

[0081] In view of the present invention, the inventors conducted a triboelectric separation comparison experiment to verify the beneficial effects of the stratified fluidized collision charging device of the present invention, as shown in Table 3 for details.

[0082] Table 3

[0083]

[0084] As shown in Table 3, using loss on ignition as an evaluation index, the results show that the loss on ignition of the positive and negative electrode products after direct sorting are 23.80% and 29.79%, respectively, which are not much different from the average loss on ignition of 25.51% of the particles before sorting; however, after adding a stratified fluidized collision charging device before sorting, the loss on ignition of the positive and negative electrode products are 12.77% and 44.40%, respectively, and the sorting effect is significantly improved.

[0085] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A powder particle stratified fluidized collision charging device, characterized in that: include Disturbance mechanism, charging screening mechanism and feeding mechanism; The disturbance mechanism is used to provide a disturbed airflow to the charged screening mechanism; The charging screening mechanism comprises a tribocharger, a fixed sieve plate, a blocking sieve plate and an outlet pipe; the fixed sieve plate is arranged near the bottom of the tribocharger; the blocking sieve plate is arranged at the center of the tribocharger; the outlet pipe is located at the top of the tribocharger; The fixed sieve plate, the blocking sieve plate and the friction charging cylinder constitute a first screening chamber, which is used to crush and disperse the powder particles entering therein to form small-size powder particles and complete the first charging of the powder particles; the blocking sieve plate and the top plate of the friction charging cylinder constitute a second screening chamber, which is used to complete the second charging of the powder particles entering therein and escape from the outlet pipe along with the disturbed airflow; The feeding mechanism is used to transport powder particles to the first screening chamber; A neck tube is provided between the bottom end of the triboelectric cylinder and the air inlet pipe and at the top end of the outlet pipe, and the neck tube is trumpet-shaped. The neck tube is used to increase the airflow velocity entering the triboelectric cylinder, guide the airflow to diffuse from the center of the triboelectric cylinder to the surroundings along the inner inclined surface of the neck tube, so that the airflow enters the first screening chamber evenly, prevents the airflow dead angle around the first screening chamber, prevents the powder particles from being deposited at the bottom of the triboelectric cylinder, and guides the escape of the powder particles to prevent them from being blocked when escaping; The feeding mechanism includes a feeder, a hopper, a screw feeder and a conveying pipe; one end of the conveying pipe is connected to the screw feeder, and the other end extends into the first screening chamber, and a discharge port is arranged near the free end; the feeder is used to convey the powder and granular material to the hopper, and then the powder and granular material are transported from the conveying pipe to the first screening chamber via the screw feeder; The blocking screen plate is installed at the center of the height of the triboelectric cylinder; the net height of the first screening chamber is approximately equal to the diameter of the triboelectric cylinder; the feeding port of the feeding mechanism is located in the first screening chamber, and the distance between the feeding port and the axis of the triboelectric cylinder is 17% to 30% of the diameter of the triboelectric cylinder; the distance between the feeding port of the feeding mechanism and the bottom surface of the blocking screen plate is 10% to 20% of the indoor height of the first screening chamber; the distance between the bottom surface of the fixed screen plate and the bottom end surface of the triboelectric cylinder is proportional to the diameter of the triboelectric cylinder, and the distance is not less than 6 cm, and the sum of the distance and the length of the necking tube is not greater than the net height of the first screening chamber; The fixed sieve plate and the blocking sieve plate are made of insulating materials; the mesh diameter of the fixed sieve plate is 0.2-0.7 mm; the mesh diameter of the blocking sieve plate is 0.1-0.5 mm; and the mesh diameter of the fixed sieve plate is larger than the mesh diameter of the blocking sieve plate.

2. A powder particle stratified fluidized collision charging device according to claim 1, characterized in that: The disturbance mechanism comprises a fan and an air inlet pipe, wherein the air inlet pipe connects the fan and the bottom of the friction charging cylinder and is used for conveying the airflow provided by the fan to the friction charging cylinder.

3. A powder particle stratified fluidized collision charging device according to claim 1, characterized in that: The conveying pipe is provided with a valve, and the amount of powder particles fed into the first screening chamber is controlled by adjusting the opening and closing angle of the valve; The delivery pipe is located at a pipe arrangement slot inside the first screening chamber.

4. A powder particle stratified fluidized collision charging device according to claim 1, characterized in that: The outlet pipe is arranged in a trapezoidal shape, and the large-diameter end of the outlet pipe is connected to the top end of the friction charging cylinder.

5. The powder particle stratified fluidized collision charging device according to claim 1, characterized in that: A third sieve plate is provided at the top of the friction charging cylinder near the outlet pipe. The mesh diameter of the third sieve plate is set to 0.07~0.1mm for further screening the powder particles; or 0.11~0.5mm for keeping the powder particles in a dispersed state when escaping.

6. A powder particle stratified fluidized collision charging method using the powder particle stratified fluidized collision charging device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, start the disturbance mechanism to operate and output the disturbed airflow, and the airflow is sent into the friction charging cylinder from the bottom end of the friction charging cylinder through the air inlet pipe; S2, the feeding mechanism operates to feed a set amount of powder and granular raw materials into the charged screening mechanism, and the powder and granular raw materials are transported to the first screening chamber through the conveying pipe; S3, the powder particle raw material is charged by friction collision for the first time in the first screening chamber of the charged screening mechanism under the action of air flow disturbance. In this process, large-sized powder particles and agglomerated powder particle clusters are crushed and dispersed to form small-sized powder particles; S4, the small-size powder particles are screened by the blocking screen plate of the charged screening mechanism under the action of air flow disturbance, and then enter the second screening chamber upward; S5, the small-size powder particles are further subjected to a second friction collision charging in the second screening chamber under the action of the airflow, and the powder particles after two collision chargings escape from the outlet pipe along with the airflow.

7. A powder particle stratified fluidized collision charging method according to claim 6, characterized in that: The wind speed of the disturbed airflow is set to 5-20 m / s.

8. A powder particle stratified fluidized collision charging method according to claim 6, characterized in that: The particle size of the powder particle raw material is set at 1-100 μm.

9. A layered fluidized collision charged powder particle, characterized in that: According to any one of claims 6 to 8, the ignition loss of the positive and negative electrode products of the charged powder particles are 12.77% and 44.40%, respectively.

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