A high-purity silicon micro-powder crushing and screening magnetic separation device

Abstract

The utility model relates to the technical field of silicon micro powder preparation equipment, concretely to a kind of crushing and screening magnetic separation device of high-purity silicon micro powder, including the tank body of horizontal crushing tank is equipped with crushing mechanism along axial direction, horizontal crushing tank top is equipped with feed inlet, tank bottom is equipped with discharge port, discharge port below is equipped with screening mechanism, screening mechanism includes screening cylinder, screening inlet is equipped with and is oppositely arranged with discharge port above screening cylinder, screening assembly is equipped in screening cylinder, screening assembly below is equipped with screening discharge pipe, magnetic separation mechanism is equipped below screening discharge pipe. Three processes of crushing, screening and magnetic separation are integrated, material transmission is fast. Crushing mechanism crushes silicon micro powder raw material to finer granularity, then the granularity distribution of silicon micro powder is accurately controlled by screening mechanism. After multistage screening, magnetic separation is carried out in magnetic separation mechanism, and impurity removal is realized in the case of introducing new impurities.

Description

Technical Field

[0001] This utility model relates to the technical field of silicon micropowder preparation equipment, specifically a crushing, screening, and magnetic separation device for high-purity silicon micropowder. Background Technology

[0002] The particle size of silicon micropowder has a significant impact on its performance. Smaller silicon particles meet the requirements for subsequent processing and use. Increased particle surface area is beneficial for subsequent chemical reactions and physical treatments. After crushing, the silicon material is sieved to remove particles that do not meet the size requirements. Silicon micropowder of different sizes can be used for different applications.

[0003] Magnetic impurities, such as iron filings and iron minerals, are often mixed into silicon micropowder. These impurities can cause conductivity problems in electronic materials and affect transparency in optical materials. Magnetic separation can effectively remove these magnetic impurities, ensuring the purity of the silicon micropowder.

[0004] Crushing, sieving, and magnetic separation are key steps in the preparation of silicon micro powder. They work together to ensure that the silicon micro powder has a suitable particle size distribution, high purity, and good performance.

[0005] However, in industrial-scale production, crushing equipment usually produces large particles after a single grinding and pulverization, which does not meet the fineness requirements of silicon micropowder. Multiple grinding processes are required, resulting in long grinding times and low efficiency.

[0006] After crushing, the particles are screened. However, for some silicon micropowders that require extremely fine particle size, the screening speed of existing screening equipment is still relatively slow, which is difficult to meet the needs of large-scale production.

[0007] Removing iron impurities using chemical methods is difficult, costly, and time-consuming, and may also cause environmental pollution. Currently, many magnetic separators still rely on manual operation for magnetic impurity removal, which is labor-intensive and inefficient. Utility Model Content

[0008] The purpose of this invention is to provide a crushing, screening, and magnetic separation device for high-purity silicon micropowder to solve the problems mentioned in the background art. This invention integrates a crushing mechanism, a screening mechanism, and a magnetic separation mechanism to comprehensively process silicon material, resulting in silicon micropowder with advantages such as particle size meeting usage standards, high purity, and good performance.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a crushing, screening, and magnetic separation device for high-purity silicon micropowder, comprising a horizontal crushing tank. The tank body has a crushing mechanism arranged axially. The top of the horizontal crushing tank has a feed inlet, and the bottom of the tank body has a discharge outlet. Below the discharge outlet is a screening mechanism, which includes a screening cylinder. Above the screening cylinder is a screening inlet directly opposite the discharge outlet. Inside the screening cylinder is a screening assembly, below the screening assembly is a screening discharge pipe, and below the screening discharge pipe is a magnetic separation mechanism. This integrates the crushing, screening, and magnetic separation processes into one device, reducing the material transfer time between different devices and avoiding material loss and contamination in intermediate stages.

[0010] The crushing mechanism inside the horizontal crushing tank can crush silicon micropowder raw materials to a finer particle size, providing a good foundation for subsequent screening and magnetic separation.

[0011] The screening mechanism precisely controls the particle size distribution of the silicon micro powder. Multi-stage screening ensures uniform particle size after screening, and the powder then enters the magnetic separation mechanism for magnetic separation.

[0012] As a further embodiment of this invention, the magnetic separation mechanism includes a rotating drum with end caps at both ends. A rotating shaft is positioned between the two end caps, and a rotary motor is mounted on one end of the rotating shaft. The rotary motor shaft is connected to the rotating shaft via a coupling. The end caps are coaxially fixed to the rotating shaft, and a magnetic system regulator is mounted on the other end of the rotating shaft. The rotating drum rotates automatically, and the rotation speed is controlled in real time to ensure stable operation and improve magnetic separation efficiency.

[0013] As a further embodiment of this invention, a magnetic system is provided along the inner wall of the rotating cylinder, and several mounting bearings are provided in the middle of the rotating shaft. A sector-shaped connecting plate is provided around the outer ring of each mounting bearing, and the outer circle of the sector-shaped connecting plate is fixedly arranged with the inner ring of the magnetic system. The magnetic system is positioned within an angle range of 105°-135° along its circumference, and the magnetic system remains fixed at all times. This design, where the magnetic system remains fixed and is connected to the rotating shaft via the mounting bearings and sector-shaped connecting plate, ensures the stability of the magnetic system's position during rotation, avoiding instability in the magnetic separation effect caused by magnetic system swaying.

[0014] The magnetic system remains in a fixed position for magnetic separation. After being adsorbed by the magnetic system, magnetic impurities are more fully separated from the silicon material as the rotating drum rotates upwards.

[0015] As a further embodiment of this utility model, the magnetic system includes several magnetic poles, and the magnetic poles are magnetic strips made of permanent magnet material, including strontium ferrite permanent magnets or neodymium iron boron permanent magnets.

[0016] As a further embodiment of this utility model, the lower part of the rotating cylinder is provided with a half-tank body, and a material selection channel is formed between the half-tank body and the outer wall of the rotating cylinder. A feeding box is provided on one side of the material selection channel, and the screening discharge pipe extends into the feeding box. A vertically arranged blowing water pipe is provided at one end of the material selection channel near the feeding box. The feeding box extends downward to form a feeding channel, and the opening of the feeding channel faces upward and is connected to the material selection channel. The fluid material flows into the material selection channel along the feeding channel. A magnetic material box is provided on the other side of the tank body. A magnetic material flushing pipe is arranged parallel to the length direction of the rotating cylinder above the magnetic material box. The magnetic material flushing pipe has several water outlets along its length, and the water outlets are set directly opposite the magnetic material box. Under the action of the blowing water in the blowing water pipe, the silicon material enters the feeding channel in a loose and suspended fluid state. It has strong fluidity. In the fluid state, the magnetic separation efficiency is high, and the material is separated quickly after magnetic separation, which is convenient for collection.

[0017] The rotating drum rotates unidirectionally towards the magnetic material box. Magnetic impurities are attracted by the magnetic system and adhere to the surface of the rotating drum. As the rotating drum continues to rotate upward, they are released from the magnetic system and are flushed into the magnetic material box through the water outlet. The bottom of the magnetic material box is equipped with a magnetic material discharge pipe. Magnetic impurities continue to rise with the rotation of the drum. When they rise to a certain height, they are no longer attracted by the magnetic system and fall naturally for separation. This does not introduce new impurities and add separation steps.

[0018] After being screened, the silicon material enters the refined material box at the end of the material selection channel. The bottom of the refined material box is equipped with a refined material discharge pipe.

[0019] As a further embodiment of this utility model, the end of the material selection channel is provided with an arc-shaped guide plate, which is positioned corresponding to the end of the magnetic system. The arc-shaped guide plate is provided with a fine material inlet that communicates with the fine material box. The top of the magnetic material box is located on one side of the rotating cylinder and has an inclined scraper that slopes towards the magnetic material box. There is a gap between the inclined scraper and the rotating cylinder through which the magnetic material passes.

[0020] As a further embodiment of this utility model, the screening mechanism includes a coarse screening layer and a fine screening layer arranged from top to bottom. The coarse screening layer includes a first screening screen, and a plurality of first vibrators are evenly distributed around the first screening screen. A first vibration spring is provided above the first screening screen corresponding to each first vibrator, and a first impurity suction pipe is provided above the first screening screen.

[0021] As a further embodiment of this utility model, the fine sieve layer includes a second sieve screen, a plurality of second vibrators are evenly distributed around the second sieve screen, a second vibration spring is provided above the second sieve screen corresponding to each second vibrator, and a second impurity suction pipe is provided above the second sieve screen.

[0022] As a further embodiment of this invention, the mesh diameter of the second screening mesh is smaller than that of the first screening mesh.

[0023] As a further embodiment of this utility model, the crushing mechanism includes a crushing shaft arranged along the axis of the horizontal crushing tank. A crushing motor is provided at one end of the crushing shaft, and a positioning bearing is provided at the other end of the crushing shaft. Several sets of crushing blades of different lengths are arranged alternately along the length direction of the crushing shaft. The crushing blades include long crushing blades and short crushing blades, which are staggered in the circumferential direction.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows: This device includes a horizontal crushing tank, the tank body of which is provided with a crushing mechanism along the axial direction. The top of the horizontal crushing tank is provided with a feed inlet, the bottom of the tank body is provided with a discharge outlet, and a screening mechanism is provided below the discharge outlet. The screening mechanism includes a screening cylinder, a screening inlet located above the screening cylinder and directly opposite the discharge outlet, a screening assembly inside the screening cylinder, a screening discharge pipe below the screening assembly, and a magnetic separation mechanism below the screening discharge pipe. By integrating the crushing, screening, and magnetic separation processes into one device, the material transfer time between different equipment is reduced, and material loss and contamination in intermediate stages are avoided.

[0025] The crushing mechanism inside the horizontal crushing tank can crush silicon micropowder raw materials to a finer particle size, providing a good foundation for subsequent screening and magnetic separation.

[0026] The screening mechanism precisely controls the particle size distribution of the silicon micro powder. Multi-stage screening ensures uniform particle size after screening, and the powder then enters the magnetic separation mechanism for magnetic separation.

[0027] During the magnetic separation process, magnetic impurities continue to rise with the rotation of the drum. When they reach a certain height, they are no longer attracted by the magnetic system and fall naturally for separation. This does not introduce new impurities or add separation steps. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the external structure of this utility model.

[0029] In the diagram: 1-Magnetic material box, 101-Magnetic material discharge pipe, 102-Inclined scraper, 103-Magnetic material flushing pipe. 2-Magnetic separation mechanism; 201-Rotary motor; 211-Rotating shaft; 212-Mounting bearing; 202-Rotating cylinder; 203-Sector-shaped connecting plate; 204-Magnetic system; 3-Horizontal crushing tank; 301-Discharge port; 302-Inlet port; 303-Short crushing blades; 304-Long crushing blades; 305-Crushing shaft; 4-First impurity suction pipe; 401-Second impurity suction pipe; 5-Screening mechanism. 501-First vibrating spring, 502-First screening screen, 503-First vibrator, 504-Screening cylinder, 505-Second vibrating spring, 506-Second screening screen, 507-Second vibrator, 508 Screening discharge pipe, 6-Blowing water pipe, 601-Water supply pump, 7-Feeding box, 701-Feeding channel, 8-Fine material box, 801-Fine material discharge pipe, 9-Selection channel, 901-Arc-shaped guide plate. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] Example 1 Please see the appendix Figure 1 - Appendix Figure 3 A crushing, screening, and magnetic separation device for high-purity silicon micropowder includes a horizontal crushing tank 3. The tank body has a crushing mechanism along its axial direction. The crushing mechanism includes a crushing shaft 305 arranged along the axis of the horizontal crushing tank. A crushing motor 1 is located at one end of the crushing shaft. When the crushing motor starts, it drives the crushing shaft to rotate synchronously. A positioning bearing is located at the other end of the crushing shaft. Several sets of crushing blades of alternating long and short lengths are arranged sequentially along the length of the crushing shaft. The crushing blades include long crushing blades 304 and short crushing blades 303, which are circumferentially staggered. A feed inlet 302 is located at the top of the horizontal crushing tank, through which silicon material enters and is crushed by the combined action of the long and short crushing blades. A discharge outlet 301 is located at the bottom of the tank. The completely crushed silicon material falls through the discharge outlet.

[0032] Example 2 A screening mechanism 5 is provided below the discharge port of the horizontal crushing tank. The screening mechanism includes a screening cylinder 504. A screening inlet is provided above the screening cylinder, which is directly opposite to the discharge port. A screening component is provided inside the screening cylinder. The screening mechanism includes a coarse screening layer and a fine screening layer arranged from top to bottom. The coarse screening layer includes a first screening screen 502. The completely crushed silicon material falls along the discharge port and lands on the first screening screen.

[0033] A number of first vibrators 503 are evenly distributed around the first screening mesh. When the first vibrator is started, the first vibrator drives the first screening mesh to vibrate synchronously. Each first vibrator is equipped with a first vibration spring 501 above the first screening mesh. The first vibration spring cooperates to make the first screening mesh vibrate. The silicon material is screened by the first screening mesh. Silicon material particles larger than the diameter of the screen holes of the first screening mesh remain on the first screening mesh.

[0034] A first impurity suction pipe 4 is provided above the first screening screen. A suction pump is provided on the first impurity suction pipe. Silicon particles remaining on the first screening screen are periodically pumped away from the surface of the first screening screen by the suction pump, and then screened again.

[0035] The fine sieve layering includes a second sieve screen 506. After the silicon material passes through the first sieve screen, it falls off to obtain primary sieved silicon material, which then falls onto the second sieve screen.

[0036] A number of second vibrators 507 are evenly distributed around the circumference of the second screening mesh. A second vibration spring 505 is located above each second vibrator on the second screening mesh. When the second vibrator is activated, it drives the second screening mesh to vibrate synchronously. The silicon material is screened by the second screening mesh, whose mesh diameter is smaller than that of the first screening mesh. Silicon material particles larger than the mesh diameter of the second screening mesh remain on the second screening mesh. A second impurity suction pipe 401 is located above the second screening mesh.

[0037] The second impurity suction pipe is equipped with a suction pump. The silicon particles remaining on the second screening screen are periodically pumped out of the surface of the second screening screen by the suction pump, so that the unscreened silicon particles can be screened again.

[0038] Silicon particles smaller than the mesh diameter of the second screening screen fall along the second screening screen to obtain the final screened silicon material. A screening discharge pipe is provided below the screening assembly. The final screened silicon material falls along the screening discharge pipe.

[0039] Example 3 A magnetic separation mechanism 2 is located below the screening discharge pipe. The magnetic separation mechanism includes a rotating drum 202, with end caps at both ends. A rotating shaft 211 is located between the two end caps. A rotating motor 201 is located at one end of the rotating shaft. During normal operation, the rotating motor is started, driving the rotating shaft to move synchronously. The rotating motor shaft is connected to the rotating shaft via a coupling. The end caps are coaxially fixed to the rotating shaft, causing the rotating drum to rotate synchronously. A magnetic system adjuster is located at the other end of the rotating shaft. The magnetic system adjuster allows for fine-tuning to adjust the distance between the magnetic system and the rotating drum.

[0040] The rotating cylinder is provided with a magnetic system 204 along the inner wall of the cylinder. The magnetic system includes several magnetic poles. The magnetic poles are magnetic strips made of permanent magnet material, including strontium ferrite permanent magnets or neodymium iron boron permanent magnets.

[0041] The rotating shaft has several mounting bearings 212 in the middle, and the outer ring of the mounting bearings has a fan-shaped connecting plate 203. The outer circle of the fan-shaped connecting plate is fixedly set with the inner ring of the magnetic system. The magnetic system is set in a 120° angle range along the circumference. Depending on the actual screening degree, different angle ranges of the magnetic system are selected, and the magnetic system always remains in a fixed state.

[0042] The lower part of the rotating cylinder is provided with a half-groove, and a material selection channel 9 is formed between the half-groove and the outer wall of the rotating cylinder. A feeding box 7 is provided on one side of the material selection channel. The screening discharge pipe 508 extends into the feeding box, and the final screened silicon material falls down along the screening discharge pipe and into the feeding box.

[0043] The material selection channel is located at one end of the feeding box and is equipped with a vertically arranged blowing water pipe 6. A water supply pump 601 is installed on the blowing water pipe. When the water supply pump is started, the water in the blowing water pipe is flushed into the feeding box, which blows the final screened silicon material into a loose and suspended fluid liquid.

[0044] The feeding box extends downward to form a feeding channel 701. The opening of the feeding channel faces upward and is connected to the material selection channel 9. The fluid material flows into the material selection channel along the feeding channel.

[0045] On the other side of the tank, there is a magnetic material box 1. The rotating cylinder rotates unidirectionally towards the magnetic material box. Magnetic impurities are attracted by the magnetic system and adhere to the surface of the rotating cylinder. As the rotating cylinder continues to rotate upward, after it is freed from the magnetic system, a magnetic material flushing pipe 103 is arranged parallel to the length of the rotating cylinder above the magnetic material box 1. The magnetic material flushing pipe has several water outlets along its length, and the water outlets are set directly opposite the magnetic material box. The magnetic material is flushed into the magnetic material box 1 through the water outlet. The bottom of the magnetic material box is equipped with a magnetic material discharge pipe. The top of the magnetic material box 1 is provided with an inclined scraper 102 that is inclined towards the magnetic material box on one side of the rotating cylinder. There is a gap between the inclined scraper and the rotating cylinder for the magnetic material to pass through.

[0046] The end of the material selection channel is provided with an arc-shaped guide plate 901, which is positioned corresponding to the end of the magnetic system. The arc-shaped guide plate 901 is provided with a fine material inlet that communicates with the fine material box. The screened silicon material enters the fine material box along the end of the material selection channel. The bottom of the fine material box 8 is provided with a fine material outlet pipe 801.

[0047] Finally, the silicon micro powder is crushed, sieved, and magnetically separated to obtain pure silicon micro powder of the target particles.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A crushing, screening, and magnetic separation device for high-purity silicon micropowder, characterized in that: The system includes a horizontal crushing tank (3), the tank body of which is provided with a crushing mechanism along the axial direction, the top of which is provided with a feed inlet (302), the bottom of which is provided with a discharge outlet (301), and a screening mechanism (5) below the discharge outlet. The screening mechanism includes a screening cylinder (504), the top of which is provided with a screening inlet that is directly opposite to the discharge outlet, the screening cylinder is provided with a screening component, the screening component is provided with a screening discharge pipe (508) below it, and a magnetic separation mechanism (2) is provided below the screening discharge pipe.

2. The crushing, screening, and magnetic separation device for high-purity silicon micropowder according to claim 1, characterized in that: The magnetic separation mechanism includes a rotating drum (202), with end caps at both ends of the rotating drum and a rotating shaft (211) between the two end caps. A rotating motor (201) is provided at one end of the rotating shaft, and the rotating motor shaft is connected to the rotating shaft through a coupling. The end caps of the drum are coaxially fixed with the rotating shaft, and a magnetic system adjuster is provided at the other end of the rotating shaft.

3. The crushing, screening, and magnetic separation device for high-purity silicon micropowder according to claim 2, characterized in that: The rotating cylinder (202) is provided with a magnetic system (204) along the inner wall of the cylinder. Several mounting bearings (212) are provided in the middle of the rotating shaft. A fan-shaped connecting plate (203) is provided on the outer ring of the mounting bearing. The outer circle of the fan-shaped connecting plate is fixedly set with the inner ring of the magnetic system. The magnetic system is set in the circumferential direction within the 105°-135° angle range. The magnetic system always remains in a fixed state.

4. The crushing, screening, and magnetic separation device for high-purity silicon micropowder according to claim 3, characterized in that: The magnetic system (204) includes several magnetic poles, which are magnetic strips made of permanent magnet material, including strontium ferrite permanent magnets or neodymium iron boron permanent magnets.

5. The crushing, screening, and magnetic separation device for high-purity silicon micropowder according to claim 4, characterized in that: The lower part of the rotating cylinder is provided with a half-tank body, and a material selection channel (9) is formed between the half-tank body and the outer wall of the rotating cylinder. A feeding box (7) is provided on one side of the material selection channel. The screening discharge pipe (508) extends into the feeding box. A vertically arranged blowing water pipe (6) is provided at one end of the feeding box of the material selection channel. The feeding box extends downward to form a feeding channel (701). The opening of the feeding channel is upward and connected to the material selection channel (9). The fluid material flows into the material selection channel along the feeding channel. A magnetic material box (1) is provided on the other side of the tank body. A magnetic flushing pipe (103) is arranged parallel to the length direction of the rotating cylinder above the magnetic material box. The magnetic flushing pipe has several water outlets along the length direction. The water outlets are set directly opposite the magnetic material box. The rotating drum (202) rotates unidirectionally towards the magnetic material box. Magnetic impurities are attracted by the magnetic system and adhere to the surface of the rotating drum. As the rotating drum continues to rotate upward, after it is removed from the magnetic system, it is flushed into the magnetic material box (1) through the flushing water in the water outlet. The bottom of the magnetic material box is provided with a magnetic material discharge pipe (101). After being screened, the silicon material enters the fine material box (8) at the end of the material selection channel. The bottom of the fine material box is equipped with a fine material discharge pipe (801).

6. The crushing, screening, and magnetic separation device for high-purity silicon micropowder according to claim 5, characterized in that: The material selection channel is provided with an arc-shaped guide plate (901) at the end, which is positioned corresponding to the end of the magnetic system. The arc-shaped guide plate is provided with a fine material inlet that communicates with the fine material box. The top of the magnetic material box is provided with an inclined scraper (102) that is inclined towards the magnetic material box on one side of the rotating cylinder, and there is a gap between the inclined scraper and the rotating cylinder for the magnetic material to pass through.

7. The crushing, screening, and magnetic separation device for high-purity silicon micropowder according to claim 1, characterized in that: The screening mechanism (5) includes a coarse screening layer and a fine screening layer arranged from top to bottom. The coarse screening layer includes a first screening screen (502). Several first vibrators (503) are evenly distributed around the first screening screen. A first vibration spring (501) is provided above the first screening screen corresponding to each first vibrator. A first impurity suction pipe (4) is provided above the first screening screen.

8. The crushing, screening, and magnetic separation device for high-purity silicon micropowder according to claim 7, characterized in that: The fine screening layer includes a second screening screen (506), a number of second vibrators (507) are evenly distributed around the second screening screen, a second vibration spring (505) is provided above the second screening screen corresponding to each second vibrator, and a second impurity suction pipe (401) is provided above the second screening screen.

9. The crushing, screening, and magnetic separation device for high-purity silicon micropowder according to claim 8, characterized in that: The mesh diameter of the second screening screen is smaller than that of the first screening screen.

10. The crushing, screening, and magnetic separation device for high-purity silicon micropowder according to claim 1, characterized in that: The crushing mechanism includes a crushing shaft (305) arranged along the axis of the horizontal crushing tank. A crushing motor is provided at one end of the crushing shaft, and a positioning bearing is provided at the other end of the crushing shaft. Several sets of crushing blades of different lengths are arranged alternately along the length direction of the crushing shaft. The crushing blades include long crushing blades (304) and short crushing blades (303). The long crushing blades and short crushing blades are staggered in the circumferential direction.

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