Equipment for treating dust and magnetic substances on surface of particle silicon

Abstract

The utility model provides equipment for treating dust and magnetic substances on the surface of particle silicon, which comprises a dust removal device for treating the dust on the surface of the particle silicon, and a magnetic absorption device for treating the magnetic substances on the surface of the particle silicon is fixedly arranged below the dust removal device; a feeding hole (11) is formed in the top of the dust removal device, and the bottom of the dust removal device is communicated with the top of the magnetic attraction device; and a discharge hole (25) is formed in the bottom of the magnetic attraction device and is communicated with a subsequent storage device. The device disclosed by the utility model can effectively remove free silicon powder on the surface of the granular silicon, reduce the turbidity and metal content of the product and effectively improve the quality of the granular silicon product.

Description

Technical Field

[0001] The utility model relates to a device for processing granular silicon, in particular to a device for processing dust and magnetic substances on the surface of granular silicon. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] In the granular silicon production process, the initial product, granular silicon, contains a large amount of dust on its surface. The current process involves two stages of dust removal before the granular silicon enters the packaging stage to form the final product. The two-stage dust removal system involves the following: the silicon material first enters a screening device, where screening and nitrogen purging are combined to perform a first-stage dust removal process, separating small particles and dust from the final product to produce a first-stage dust-removed product. The first-stage dust-removed product then enters a second-stage dust removal device, where dust is removed to produce the final granular silicon product. The final granular silicon enters the packaging stage to form the final granular silicon product.

[0004] After the above-mentioned two-stage dust removal treatment of granular silicon, there is still obvious dust remaining on the packaging bags during the repackaging process, and there is still some free silicon powder on the surface of the silicon material, which causes extremely unstable turbidity. At the same time, the initial product granular silicon contains a small amount of magnetic material, which will affect the metal content of the final product, and ultimately lead to high wire breakage rate and low conversion rate in the downstream single crystal pulling process.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Utility Model Content

[0006] Purpose of the invention: The technical problem to be solved by the present invention is to provide a device for treating dust and magnetic substances on the surface of granular silicon in view of the shortcomings of the existing technology.

[0007] In order to solve the above technical problems, the utility model discloses a device for treating dust and magnetic substances on the surface of granular silicon, comprising:

[0008] A dust removal device for processing dust on the surface of granular silicon, wherein a magnetic attraction device for processing magnetic substances on the surface of granular silicon is fixedly provided below the dust removal device;

[0009] The dust removal device is provided with a feed port at the top, and the bottom is connected to the top of the magnetic attraction device;

[0010] A discharge port is provided at the bottom of the magnetic attraction device and is communicated with a subsequent storage device.

[0011] Furthermore, the dust removal device specifically includes:

[0012] A hollow upper barrel body, wherein the feed port is opened at the top of the upper barrel body; a purge port for inputting purge gas is opened on the side of the top of the upper barrel body, and a negative pressure port for discharging the purge gas is also opened at the top of the upper barrel body;

[0013] A discharge pipe for discharging the dust-removed granular silicon is provided at the bottom of the upper barrel, and the lower end of the discharge pipe is connected to the top of the magnetic attraction device.

[0014] Furthermore, the magnetic attraction device specifically includes:

[0015] A lower barrel body whose top is connected to the bottom of the dust removal device, wherein an inverted Y-shaped bracket is fixedly provided in the lower barrel body; a buffer device for buffering the falling granular silicon is fixedly provided on the top of the bracket, and a fixing groove is provided at the bottom; a magnetic plate is placed on the fixing groove;

[0016] The discharge port is provided at the bottom of the lower barrel.

[0017] Furthermore, the upper barrel body is in the shape of an inverted cone.

[0018] Furthermore, a convex point is provided on the inner side wall of the upper barrel body.

[0019] Furthermore, the purge port intersects with the side wall of the upper barrel body, and the angle with the horizontal plane is 15° to 60°.

[0020] Furthermore, a disassembly and inspection port is provided on the side surface of the lower barrel body, corresponding to the positions of the buffer device and the magnetic plate.

[0021] Furthermore, a vacuum pipe opening is provided on the barrel wall of the lower barrel body.

[0022] Furthermore, the buffer device is in the shape of an inverted cone, and the circular diameter of the top surface is larger than the bottom of the dust removal device;

[0023] The angle between the magnetic plate and the horizontal plane is 15°.

[0024] Furthermore, the dust removal device and the magnetic attraction device are connected via a ball valve.

[0025] Beneficial effects:

[0026] The utility model can effectively remove free silicon powder on the surface of granular silicon, reduce product turbidity and metal content, and effectively improve the quality of granular silicon products. Specifically:

[0027] 1. In the present invention, the purge port is at a certain angle to the horizontal plane and intersects tangentially with the conical barrel, ensuring that the granular silicon moves in a spiral downward, which can effectively prevent products with smaller particle sizes from entering the negative pressure pipe due to purge and causing losses.

[0028] 2. In the present invention, the dust removal area is set as an inverted cone shape, which can increase the residence time of the granular silicon in the system and improve the powder removal rate.

[0029] 3. In the present invention, the inverted cone material receiving device is provided in the magnetic attraction area to reduce the damage of the granular silicon to the pipe wall caused by scouring. At the same time, the granular silicon is diverted to improve the magnetic attraction efficiency of the strong magnetic plate.

[0030] 4. In the present invention, the magnetic plates in the magnetic attraction area can be regularly disassembled and replaced. The disassembly and inspection can be used to monitor the status of magnetic materials in the production line, so as to facilitate subsequent process improvements.

[0031] 5. In the present invention, the granular silicon can achieve dust-free product packaging process through the dust removal and magnetic absorption system, effectively reducing the pollution to the clean room, greatly reducing the turbidity and metal content of the silicon material, improving product quality, and reducing the breakage rate of the drawn single crystal silicon rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more apparent.

[0033] Figure 1 It is a front view of an embodiment of the utility model.

[0034] Figure 2 It is a side view of an embodiment of the utility model.

[0035] In the figure, 1 is the upper barrel body, 11 is the feed port, 12 is the negative pressure port, 13 is the purge port, 14 is the discharge pipe, 15 is the convex point, 16 is the disassembly and inspection port, 2 is the lower barrel body, 21 is the bracket, 22 is the buffer device, 23 is the magnetic plate, 24 is the fixing groove, 25 is the discharge port, 26 is the vacuum pipe port, and 3 is the ball valve. DETAILED DESCRIPTION

[0036] like Figure 1 As shown, the overall concept of the utility model is as follows:

[0037] 1. Dust removal section: Add an inverted conical barrel 1 before the granular silicon is packaged. A feed port 11 and a negative pressure port 12 are set on the top of the conical barrel. A nitrogen purge port 13 is set next to the cone near the top of the tank. The purge port 13 intersects tangentially with the conical barrel 1, and the purge direction is at a certain angle (15°-60°) to the horizontal plane. The negative pressure port 12 is connected to the filter. After the silicon material enters the conical barrel 1 through the feed port 11, nitrogen purge is used to give the silicon material a tangential force. Under the dual action of its own gravity and the force of nitrogen, the silicon material performs a gradually downward spiral motion in the conical barrel 1. During the movement, the silicon materials constantly rub against each other, causing the free silicon powder on the surface to detach. The silicon powder is then vacuumed through the negative pressure port 12 on the top and adsorbed into the subsequent filtration system to achieve a deep dust removal effect on the silicon material. (During operation, the entire system maintains a slight positive pressure to prevent external contamination.)

[0038] 2. Buffering and demagnetization section: The lower barrel body 2 is arranged below the upper barrel body 1. An inverted "Y"-shaped bracket 21 is provided in this area. An inverted conical buffer device 22 with a diameter larger than the discharge pipe 14 is welded above the bracket 21. On both sides are fixed grooves 24 for placing magnetic plates 23. After the final dust removal, the granular silicon product first falls into the buffer device 22 with a diameter larger than the discharge pipe 14 for deceleration and buffering. The buffered granular silicon product is then diverted to the strong magnetic plates 23 on both sides, which are at a -15° angle to the horizontal plane. The magnetic material is adsorbed to the plate surface under the action of the magnetic field of the strong magnetic plate. Normal granular silicon products are not affected by the magnetic field and normally fall into the product tank below through the discharge port 25 for storage, ultimately achieving the effect of removing the magnetic material in the granular silicon.

[0039] like Figure 2 As shown, in one embodiment, a ball valve 3 is provided between the upper barrel 1 and the lower barrel 2 for controlling the falling of the granular silicon.

[0040] In one embodiment, the purge port 13 is at a certain angle to the horizontal plane and intersects tangentially with the conical barrel 1, ensuring that the granular silicon moves in a spiral downward, which can effectively prevent products with smaller particle sizes from entering the negative pressure pipe due to purge and causing losses.

[0041] In one embodiment, the dust removal area is configured as an inverted cone, which can increase the residence time of the granular silicon in the system and improve the powder removal rate.

[0042] In one embodiment, an inverted cone is provided in the magnetic attraction area to reduce the damage caused by erosion of the tube wall by the granular silicon, and at the same time, the granular silicon is diverted to improve the magnetic attraction efficiency of the strong magnetic plate.

[0043] In one embodiment, the magnetic plates in the magnetic attraction area can be regularly disassembled and replaced. The disassembly and inspection can be used to monitor the status of magnetic materials in the production line to facilitate subsequent process improvements.

[0044] In one embodiment, the granular silicon can achieve dust-free product packaging process through the dust removal and magnetic absorption system, effectively reduce the pollution to the clean room, significantly reduce the turbidity and metal content of the silicon material, improve product quality, and reduce the breakage rate of the drawn single crystal silicon rod.

[0045] In one embodiment, small protrusions 15 are added to the inner wall of the inverted conical barrel 1 of the dust removal section to increase the friction between the granular silicon and the inner wall, thereby enhancing the dust removal effect;

[0046] In one embodiment, a disassembly opening 26 is provided on the side of the lower barrel 2 for inspecting the internal devices thereof.

[0047] In one embodiment, the deceleration buffer demagnetization section may be equipped with a vacuum nozzle 27 to further remove dust from the system.

[0048] This utility model provides a device and method for treating dust and magnetic materials on the surface of granular silicon. There are many methods and approaches to implement this technical solution. The above is only a preferred embodiment of the utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the utility model. Such improvements and modifications should also be considered within the scope of protection of the utility model. Any components not specified in this embodiment may be implemented using existing technologies.

Claims

1. A device for treating dust and magnetic substances on the surface of granular silicon, characterized in that: include: A dust removal device for processing dust on the surface of granular silicon, wherein a magnetic attraction device for processing magnetic substances on the surface of granular silicon is fixedly provided below the dust removal device; The dust removal device is provided with a feed port (11) at the top, and the bottom is connected to the top of the magnetic attraction device; A discharge port (25) is provided at the bottom of the magnetic attraction device and is communicated with a subsequent storage device.

2. The device for treating dust and magnetic substances on the surface of granular silicon according to claim 1, characterized in that: The dust removal device specifically includes: A hollow upper barrel (1), wherein the feed port (11) is opened at the top of the upper barrel (1); a purge port (13) for inputting purge gas is opened on the side of the top of the upper barrel (1); and a negative pressure port (12) for discharging the purge gas is also opened at the top of the upper barrel (1); A discharge pipe (14) for discharging the dust-removed granular silicon is provided at the bottom of the upper barrel (1), and the lower end of the discharge pipe (14) is connected to the top of the magnetic attraction device.

3. The device for treating dust and magnetic substances on the surface of granular silicon according to claim 1, characterized in that: The magnetic attraction device specifically includes: A lower barrel (2) whose top is connected to the bottom of the dust removal device, wherein an inverted Y-shaped bracket (21) is fixedly provided in the lower barrel (2); a buffer device (22) for buffering the falling granular silicon is fixedly provided on the top of the bracket (21), and a fixing groove (24) is provided at the bottom; a magnetic plate (23) is placed on the fixing groove (24); The bottom of the lower barrel (2) is provided with the discharge port (25).

4. The device for treating dust and magnetic substances on the surface of granular silicon according to claim 2, characterized in that: The upper barrel (1) is in the shape of an inverted cone.

5. The device for treating dust and magnetic substances on the surface of granular silicon according to claim 4, characterized in that: A convex point (15) is provided on the inner side wall of the upper barrel body (1).

6. The device for treating dust and magnetic substances on the surface of granular silicon according to claim 4, characterized in that: The purge port (13) intersects with the side wall of the upper barrel (1) and has an angle of 15° to 60° with the horizontal plane.

7. The device for treating dust and magnetic substances on the surface of granular silicon according to claim 3, characterized in that: A disassembly and inspection opening (26) is provided on the side of the lower barrel (2), corresponding to the positions of the buffer device (22) and the magnetic plate (23).

8. The device for treating dust and magnetic substances on the surface of granular silicon according to claim 3, characterized in that: A vacuum pipe opening (27) is provided on the barrel wall of the lower barrel body (2).

9. The device for treating dust and magnetic substances on the surface of granular silicon according to claim 3, characterized in that: The buffer device (22) is in the shape of an inverted cone, and the circular diameter of the top surface is larger than the bottom of the dust removal device; The angle between the magnetic plate (23) and the horizontal plane is 15°.

10. The device for treating dust and magnetic substances on the surface of granular silicon according to claim 1, characterized in that: The dust removal device and the magnetic attraction device are connected via a ball valve (3).

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