Impurity removal and demagnetization device for falling particle silicon

Abstract

The utility model provides an impurity-removing and demagnetizing device for falling particle silicon, which is applied to the technical field of impurity removal of silicon materials. The device comprises a feeding device, an impurity removing device, a demagnetizing device and a discharging device, the feeding device is arranged above the impurity removing device, and silicon particles sequentially pass through the impurity removing device and the demagnetizing device and then enter the discharging device; the impurity removal device comprises an air blowing mechanism, an impurity removal belt and an impurity recovery tank; the blowing mechanism is arranged between the feeding device and the impurity removing belt, and the impurity removing belt is obliquely arranged to drive light impurities and chippings to be upwards conveyed into the impurity recycling tank; and the demagnetizing device comprises a demagnetizing belt, a scraping plate and a magnetic impurity collecting tank. The device has the beneficial effects that the automatic impurity removal and demagnetization of the granular silicon are realized, the labor is saved, the impurity removal and demagnetization efficiency is improved, the whole structure is simple, and the operation is convenient; impurity removal and demagnetization are conducted many times, and the impurity removal and demagnetization effect and the product quality are guaranteed. The application range is wider, and the flexibility is higher; and the production cost of the single crystal is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of silicon material impurity removal, in particular to a device for removing impurities and demagnetizing fallen silicon particles. Background Art

[0002] In the solar photovoltaic and semiconductor material manufacturing industries, as the amount of granular silicon used increases, more and more granules fall to the ground during use. In order to avoid wasting resources, it is usually necessary to recycle the granular silicon that has fallen to the ground; however, it is difficult to avoid impurities in the granular silicon that has fallen to the ground, and the impurities must be removed before use. The existing technology uses manual selection methods, which have poor stability in the removal effect and require repeated selection to completely remove impurities. The impurity removal efficiency is low, the cycle is long, and a large amount of human resources is required, resulting in an increase in the cost of using granular silicon. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a device for removing impurities and demagnetizing fallen silicon particles, which effectively solves the problems of low impurity removal efficiency and poor impurity removal effect of fallen silicon particles.

[0004] The technical solution adopted by the utility model is:

[0005] A device for removing impurities and demagnetizing fallen silicon particles, comprising a feeding device, an impurity removal device, a demagnetization device and a discharging device, wherein the feeding device is arranged above the impurity removal device, and the silicon particles sequentially pass through the impurity removal device and the demagnetization device before entering the discharging device; the impurity removal device removes light impurities and debris in the silicon particles; the demagnetization device absorbs magnetic impurities in the silicon particles by electromagnetic absorption.

[0006] Furthermore, the impurity removal device includes a blower mechanism, an impurity removal belt and an impurity recovery trough; the impurity removal belt is arranged at an angle and has protrusions on the surface; the blower mechanism is arranged between the feeding device and the impurity removal belt to blow the light impurities to the side close to the high end of the impurity removal belt; the impurity removal belt drives the light impurities and the debris to be transported upward into the impurity recovery trough, and the granular silicon rolls to the lower end of the impurity removal belt to the demagnetization device.

[0007] Furthermore, the bottom of the feeding device is arranged to be inclined, and the inclination direction is the same as that of the impurity removal belt; and a discharge port and a switch valve are arranged on the side wall connected to the lower side of the bottom.

[0008] Furthermore, the material discharge port and the air outlet of the air blowing mechanism are arranged along the width direction of the impurity removing belt.

[0009] Furthermore, the demagnetization device includes a demagnetization belt, a scraper and a magnetic impurity collection trough; the demagnetization belt drives the granular silicon to be transported to the discharging device, and absorbs the magnetic impurities to rotate; the scraper is arranged in the magnetic impurity collection trough and abuts against the demagnetization belt to scrape off the magnetic impurities.

[0010] Furthermore, the demagnetization belt is arranged obliquely along its transmission direction.

[0011] Furthermore, the demagnetization belt comprises a primary demagnetization belt and a secondary demagnetization belt, which are arranged in sequence along the transmission direction.

[0012] Furthermore, the entry end of the primary demagnetization belt is arranged below the de-impurity belt, and the end end is arranged above the secondary demagnetization belt.

[0013] Furthermore, the impurity recovery trough is arranged below the demagnetization belt; and the magnetic impurity collection trough is arranged below the demagnetization belt.

[0014] Furthermore, baffles are provided on both sides of the de-impurity belt and the demagnetization belt.

[0015] The advantages and positive effects of the utility model are:

[0016] 1. It realizes the automatic impurity removal and demagnetization of granular silicon, saves labor, improves the efficiency of impurity removal and demagnetization, and has a simple overall structure and convenient operation.

[0017] 2. According to the characteristics of impurities, multiple impurity removal and demagnetization are carried out through the blower mechanism, impurity removal belt, secondary demagnetization belt and secondary demagnetization belt to ensure the impurity removal and demagnetization effect and product quality.

[0018] 3. The size of the discharge port of the feeding device, the wind force and air volume of the blowing mechanism, and the running speed of the impurity removal belt and the demagnetization belt can be set according to actual needs. It can be used for impurity removal and demagnetization of granular silicon of different particle sizes, with a wider range of applications and higher flexibility.

[0019] 4. After being demagnetized and removed from impurities, the granular silicon can be used in the production of single crystals, reducing the production cost of single crystals. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a specific implementation of the utility model.

[0021] In the figure:

[0022] 1. Loading device 2. Impurity removal device 201. Blower mechanism

[0023] 202, impurity removal belt 203, impurity recovery tank 3, demagnetization device

[0024] 301, demagnetization belt 3011, primary demagnetization belt 3012, secondary demagnetization belt

[0025] 302, scraper 4, discharge device DETAILED DESCRIPTION

[0026] The embodiments of the present utility model are described below in conjunction with the accompanying drawings.

[0027] In the description of the embodiments of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "set" and "connect" 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 directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood by specific circumstances.

[0028] like Figure 1 As shown, the utility model proposes a device for removing impurities and demagnetizing granular silicon that has fallen on the ground, comprising a feeding device 1, an impurity removal device 2, a demagnetization device 3 and a discharging device 4. The feeding device 1 is arranged above the impurity removal device 2, and the granular silicon passes through the impurity removal device 2 and the demagnetization device 3 in sequence and then enters the discharging device 4; the impurity removal device 2 removes light impurities and debris in the granular silicon; the demagnetization device 3 absorbs magnetic impurities in the granular silicon by electromagnetic absorption. The inventor of the present application has found that the main impurities of the granular silicon scattered on the ground during production or transportation include light impurities, single crystal debris, polycrystalline debris, quartz debris and other irregular impurities and magnetic impurities. According to the specific impurities, the present device first removes light impurities and debris in the granular silicon through the impurity removal device 2, and then removes magnetic impurities in the granular silicon through the demagnetization device 3, thereby achieving a good impurity removal effect.

[0029] The impurity removal device 2 includes a blower mechanism 201, an impurity removal belt 202 and an impurity recovery trough 203; the impurity removal belt 201 is arranged at an angle and has protrusions on its surface (not shown in the figure); the blower mechanism 201 is arranged between the feeding device 1 and the impurity removal belt 202, and blows light impurities to the side close to the high end of the impurity removal belt 201; the impurity removal belt 201 conveys light impurities and debris upward into the impurity recovery trough 203, and the granular silicon rolls toward the lower end of the impurity removal belt 201 to the demagnetization device 3.

[0030] In the present embodiment, the air blowing mechanism 201 is arranged on one side of the falling direction of the granular silicon, specifically, on the side close to the lower end of the impurity removal belt 202; due to their small weight, light impurities are blown down to the side close to the high end of the impurity removal belt 202 under the action of the air blowing mechanism 201; at the same time, the granular silicon together with the debris impurities therein are less affected or not affected by the air blowing mechanism 201, and continue to fall to the impurity removal belt 202, completing the preliminary separation of light impurities; since the impurity removal belt 202 is inclined, the granular silicon is heavier and its shape is more convenient for rolling, and under the action of its own weight, it rolls downward along the impurity removal belt 202 to the demagnetization device 3, and at the same time, the light impurities and debris are blocked by the protrusions on the surface of the impurity removal belt 201, and are driven upward by the impurity removal belt 2021, thereby separating the light impurities and debris from the granular silicon, and realizing the effective removal of light impurities and debris.

[0031] Preferably, the height of the protrusions on the surface of the impurity removal belt 202 is 2-5 mm, which can fully block the debris without adversely affecting the rolling of the granular silicon; the inclination angle of the impurity removal belt 202 should not be too large to prevent the debris from rolling down with the granular silicon; at the same time, the angle of the impurity removal belt 202 should not be too small, which will make it difficult for the granular silicon to roll down or form accumulation, affecting the impurity removal effect. Preferably, the angle of the impurity removal belt 202 is set to an angle of 3°-20° with the horizontal direction.

[0032] In this embodiment, the wind force and air volume of the air blowing mechanism 201 can be adjusted according to actual needs.

[0033] In order to make it easier for the granular silicon to roll downward, the bottom of the loading device 1 is tilted, and the tilting direction is the same as that of the impurity removal belt 201; the side wall connected to the lower side of the bottom is provided with a discharge port and a switch valve (not shown in the figure). This design allows the granular silicon to have an initial speed in the tilted downward direction when falling through the discharge port, so that it retains part of the initial speed when falling to the impurity removal belt 201, and at the same time, under the superposition of its own gravity, it rolls more smoothly in the direction opposite to the conveying direction of the impurity removal belt 201, thereby improving the impurity removal efficiency and being more conducive to the smooth operation of the overall device.

[0034] In this embodiment, the discharge port of the feeding device 1 should not be set too large to avoid too many granular silicon falling through the discharge port at the same time, resulting in too large a thickness of granular silicon laid on the impurity removal belt 201, affecting the rolling of granular silicon downward. Preferably, the size of the discharge port is matched with the particle size of the granular silicon and the running speed and inclination angle of the impurity removal belt 202, so that the granular silicon is laid in a single layer when it falls on the impurity removal belt 201. Preferably, the opening and closing size of the discharge port can be set as needed by switching the valve.

[0035] The discharge port and the air outlet of the blower mechanism 201 are arranged along the width direction of the impurity removal belt 202; that is, when the granular silicon falls onto the impurity removal belt 202 from the discharge port, it is evenly scattered along the width direction of the impurity removal belt 202, and will not accumulate at individual locations to affect the downward rolling of the granular silicon; preferably, in order to ensure the thorough removal of light impurities, the blower mechanism 201 is also arranged along the width direction of the impurity removal belt 202, and at the same time, the length of the blower mechanism 201 is not less than the length of the discharge port of the feeding device, so that the coverage range of the blower mechanism 201 includes the entire discharge port length range, and the granular silicon containing impurities falling from the discharge port is evenly blown by the wind of the blower mechanism 201, thereby achieving preliminary separation from the light impurities.

[0036] The demagnetization device 3 includes a demagnetization belt 301, a scraper 302 and a magnetic impurity collection trough; the demagnetization belt 301 transports the granular silicon to the discharging device 4, and absorbs the magnetic impurities and rotates to the top of the magnetic impurity collection trough; the scraper 302 is arranged in the magnetic impurity collection trough and abuts against the demagnetization belt 301 to scrape off the magnetic impurities. The demagnetization belt 301 is an electromagnetic device. When it is running, uniform magnetic force is generated on all parts of its surface. Granular silicon with magnetic impurities falls from the demagnetization belt 202 to the surface of the demagnetization belt 301. The demagnetization belt 301 rotates along the rolling direction of the granular silicon, driving the granular silicon 5 to continue to be transmitted forward to the end of the demagnetization belt 301, and the granular silicon continues to roll forward to the discharging device 4. At the same time, the magnetic impurities are adsorbed by the demagnetization belt 301 and driven to continue to rotate downward. Under the action of the scraper 302, they are scraped into the magnetic impurity collection tank, thereby removing the magnetic impurities. In order to ensure the effect of the scraper 302 in removing magnetic impurities, the scraper 301 conflicts with the demagnetization belt 301 in the entire width direction, and can be set to one or more along the length direction of the demagnetization belt 301.

[0037] The demagnetization belt 301 is tilted along its transmission direction so that the granular silicon can continue to roll forward after being conveyed to the end of the demagnetization belt 3 and finally enter the discharging device 4 .

[0038] In order to further ensure the removal effect of magnetic impurities, the demagnetization belt 301 includes a primary demagnetization belt 3011 and a secondary demagnetization belt 3012, which are arranged in sequence along the transmission direction; the granular silicon enters the secondary demagnetization belt 3012 from the end of the primary demagnetization belt 3011. As the secondary demagnetization belt 3012 runs, the granular silicon with magnetic impurities is further broken up and evenly scattered along the length direction of the secondary demagnetization belt 3012, so that the magnetic impurities are completely adsorbed and removed.

[0039] In order to ensure that the granular silicon is smoothly transmitted from the de-impurity belt 202 to the discharging device 4, the entrance end of the first-level demagnetization belt 3011 is arranged below the de-impurity belt 202, so that when the granular silicon rolls to the lower end of the de-impurity belt 202, it can smoothly roll down to the entrance end of the first-level demagnetization belt 3011 under the action of its own gravity and rolling speed, and then move forward with the first-level demagnetization belt 3011 to the end of the first-level demagnetization belt 3011. The end of the first-level demagnetization belt 3011 is arranged above the second-level demagnetization belt 3012, so that the granular silicon can fall to the second-level demagnetization belt 3012 again under the action of its own gravity and rolling speed; the overall transmission process is smooth and smooth, which ensures the effect of de-impurity and demagnetization.

[0040] In a preferred implementation, in order to maximize the efficient operation of the device, the de-dusting belt 202, the primary demagnetization flat belt 3011 and the secondary demagnetization belt 3012 are connected end to end; specifically, the entrance end of the primary demagnetization belt 3011 is arranged below the lower end of the de-dusting belt 202, and the end of the primary demagnetization belt 3011 is arranged above the entrance end of the secondary demagnetization belt 3012.

[0041] In order to facilitate the collection of light impurities, debris and magnetic impurities, and to avoid the overall device from occupying a large space, the impurity recovery trough 203 is arranged below the de-impurity belt and is connected to the upper end of the de-impurity belt 202. The de-impurity belt 202 rotates from bottom to top, driving light impurities and debris from the upper end to fall into the impurity recovery trough 203; the magnetic impurity collection trough is arranged below the demagnetization belt 301, and is connected to the end of the demagnetization belt 301, so that the magnetic impurities are adsorbed by the demagnetization belt 301 and driven to continue to rotate downward, and are scraped into the magnetic impurity collection trough under the action of the scraper 302.

[0042] In this embodiment, the impurity recovery tank 203 and the magnetic impurity collection tank can be connected to the outside world, so as to facilitate the removal of light impurities, debris and magnetic impurities in the impurity recovery tank 203 and the magnetic impurity collection tank.

[0043] In order to prevent the granular silicon from rolling down from both sides of the de-impurity belt 202 and the demagnetization belt 301 when rolling on the surface, baffles are arranged on both sides of the de-impurity belt 202 and the demagnetization belt 301; the height of the baffle is set according to the particle size and scattered thickness of the granular silicon, preferably, it is set to 200-400mm.

[0044] The technical solution of the present utility model is described below in conjunction with specific embodiments, wherein the devices and facilities not specifically described in the embodiments can be purchased from commercial companies unless otherwise specified.

[0045] Example 1

[0046] like Figure 1As shown, a device for removing impurities and demagnetizing fallen granular silicon comprises a feeding device 1, an impurity removal device 2, a demagnetization device 3 and a discharging device 4; the impurity removal device 2 comprises a blower mechanism 201, an impurity removal belt 202 and an impurity recovery tank 203; the impurity removal belt 201 is tilted, and the tilt angle is 10°; the surface of the impurity removal belt 201 is provided with barb-shaped protrusions (not shown in the figure), the height of the protrusions is 3mm, and the length of the impurity removal belt 201 is 2500mm; the feeding device 1 is arranged above the impurity removal device 2, and the bottom of the feeding device 1 is tilted, and the tilt direction is the same as that of the impurity removal belt 201; the side wall connected to the lower side of the bottom is provided with a discharging port and a switch valve (not shown in the figure), the discharging port is arranged along the width direction of the impurity removal belt 201, and the switch valve can control the discharging port Opening and closing size; the air blowing mechanism 201 is arranged between the feeding device 1 and the impurity removing belt 202, and is arranged on the side of the lower end of the impurity removing belt 202 in the falling direction of the granular silicon; the air outlet of the air blowing mechanism 201 is arranged along the width direction of the impurity removing belt 202, and the length of the air outlet is greater than the length of the discharge port; when the granular silicon with impurities falls, the air blowing mechanism 201 blows the light impurities to the side close to the high end of the impurity removing belt 201; the impurity removing belt 201 runs from bottom to top, and an impurity recovery trough 203 is arranged under the impurity removing belt 201, and the upper end of the impurity removing belt 201 is connected with the impurity recovery trough 203, and the impurity removing belt 201 drives the light impurities and debris to be transported upward into the impurity recovery trough 203; the granular silicon rolls to the lower end of the impurity removing belt 201 to the demagnetization device 3. The demagnetization device 3 includes a demagnetization belt 301, a scraper 302 and a magnetic impurity collection tank. The demagnetization belt 301 includes a primary demagnetization belt 3011 and a secondary demagnetization belt 3012, both of which are inclined. The entry end of the primary demagnetization belt 3011 is set below the lower end of the demagnetization belt 202, and the end of the primary demagnetization belt 3011 is set above the entry end of the secondary demagnetization belt 3012. The magnetic impurity collection tank is set below the demagnetization belt 301 and is connected to the end of the demagnetization belt 301. The scraper 302 is set in the magnetic impurity collection tank and abuts against the demagnetization belt 301, and abuts against the entire width direction of the demagnetization belt 301. Baffles with a height of 200 mm are set on both sides of the demagnetization belt 202 and the demagnetization belt 301.

[0047] In this embodiment, the material device 1, the impurity removal device 2, the demagnetization device 3 and the discharging device 4 are all installed on a fixed frame, the impurity removal belt 201, the first-level demagnetization belt 3011 and the second-level demagnetization belt 3012 are respectively driven by the driving device to rotate, and the operating speeds of the three can be adjusted; the first-level demagnetization belt 3011 and the second-level demagnetization belt 3012 are electromagnetic devices, so that the surface of the devices has a uniform magnetic force; a transparent protective cover is arranged above the fixed frame, and the material device 1, the impurity removal device 2, the demagnetization device 3 and the discharging device 4 are all arranged inside the transparent protective cover to prevent the granular silicon from jumping out and facilitate the operator to observe the inside.

[0048] The working process of this example: the size of the discharge port of the feeding device 1, the wind force and air volume of the air blowing mechanism 301, and the running speeds of the impurity removal belt 202 and the demagnetization belt 3011 are set according to actual needs; the granular silicon falls from the discharge port of the feeding device 1, and under the action of the air blowing mechanism 201, the light impurities fall to the side of the impurity removal belt 202 close to the high end, and the granular silicon together with the debris impurities therein are less affected by the air blowing mechanism 201, and continue to fall to the impurity removal belt 202, completing the preliminary separation of the light impurities; the light impurities and debris are blocked by the protrusions on the surface of the impurity removal belt 201, and are driven upward by the impurity removal belt 2021, and finally enter the impurity recovery tank 203; the granular silicon rolls downward along the impurity removal belt 202 to the demagnetization device 3 under the action of its own weight, so that the light impurities and debris are separated from the granular silicon; the granular silicon falls to the primary demagnetization belt 3011, and the primary demagnetization belt 3011 rotates along the rolling direction of the granular silicon, driving The granular silicon continues to be transmitted forward to the end of the primary demagnetization belt 301, and the granular silicon falls to the secondary demagnetization belt 3012 again under the action of its own gravity and rolling speed. The magnetic impurities are adsorbed by the primary demagnetization belt 3011 and driven to continue to rotate downward, and are scraped into the magnetic impurity collection tank under the action of the scraper 302, thereby achieving the first removal of magnetic impurities; the granular silicon enters the secondary demagnetization belt 3012 from the end of the primary demagnetization belt 3011, and with the operation of the secondary demagnetization belt 3012, the granular silicon with magnetic impurities is further broken up and evenly scattered along the length direction of the secondary demagnetization belt 3012. The remaining magnetic impurities are adsorbed by the secondary demagnetization belt 3012 and driven to continue to rotate downward, and are scraped into the magnetic impurity collection tank under the action of the scraper 302, thereby achieving complete removal of magnetic impurities; the granular silicon continues to roll forward to the discharging device 4, and the granular silicon in the discharging device 4 can continue to be used as raw material.

[0049] The advantages and positive effects of the utility model are:

[0050] 1. It realizes the automatic impurity removal and demagnetization of granular silicon, saves labor, improves the efficiency of impurity removal and demagnetization, and has a simple overall structure and convenient operation.

[0051] 2. According to the characteristics of impurities, multiple impurity removal and demagnetization are carried out through the blower mechanism, impurity removal belt, secondary demagnetization belt and secondary demagnetization belt to ensure the impurity removal and demagnetization effect and product quality.

[0052] 3. The size of the discharge port of the feeding device, the wind force and air volume of the blowing mechanism, and the running speed of the impurity removal belt and the demagnetization belt can be set according to actual needs. It can be used for impurity removal and demagnetization of granular silicon of different particle sizes, with a wider range of applications and higher flexibility.

[0053] 4. After being demagnetized and removed from impurities, the granular silicon can be used in the production of single crystals, reducing the production cost of single crystals.

[0054] The above is a detailed description of the embodiments of the utility model, but the contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A device for removing impurities and demagnetizing fallen silicon particles, characterized in that: It includes a feeding device, an impurity removal device, a demagnetization device and a discharging device, wherein the feeding device is arranged above the impurity removal device, and the granular silicon enters the discharging device after passing through the impurity removal device and the demagnetization device in sequence; the impurity removal device removes light impurities and debris in the granular silicon; the demagnetization device absorbs magnetic impurities in the granular silicon by electromagnetic absorption; the impurity removal device includes an air blowing mechanism, an impurity removal belt and an impurity recovery trough; the impurity removal belt is arranged obliquely, and a protrusion is provided on the surface; the air blowing mechanism is arranged between the feeding device and the impurity removal belt, and blows the light impurities to the side close to the high end of the impurity removal belt; the impurity removal belt drives the light impurities and the debris to be transported upward into the impurity recovery trough, and the granular silicon rolls to the lower end of the impurity removal belt to the demagnetization device.

2. The device for removing impurities and demagnetizing fallen silicon particles according to claim 1, characterized in that: The bottom of the feeding device is tilted, and the tilting direction is the same as that of the impurity removal belt; a discharge port and a switch valve are arranged on the side wall connected to the lower side of the bottom.

3. The device for removing impurities and demagnetizing fallen silicon particles according to claim 2, characterized in that: The material outlet and the air outlet of the air blowing mechanism are arranged along the width direction of the impurity removing belt.

4. The device for removing impurities and demagnetizing fallen silicon particles according to claim 3, characterized in that: The demagnetization device includes a demagnetization belt, a scraper and a magnetic impurity collection tank; the demagnetization belt drives the granular silicon to be transported to the discharging device, and absorbs the magnetic impurities to rotate; the scraper is arranged in the magnetic impurity collection tank and abuts against the demagnetization belt to scrape off the magnetic impurities.

5. The device for removing impurities and demagnetizing fallen silicon particles according to claim 4, characterized in that: The demagnetization belt is arranged obliquely along its transmission direction.

6. The device for removing impurities and demagnetizing fallen silicon particles according to claim 5, characterized in that: The demagnetization belt comprises a primary demagnetization belt and a secondary demagnetization belt, which are arranged in sequence along the transmission direction.

7. The device for removing impurities and demagnetizing fallen silicon particles according to claim 6, characterized in that: The entry end of the primary demagnetization belt is arranged below the impurity removal belt, and the end end is arranged above the secondary demagnetization belt.

8. The device for removing impurities and demagnetizing fallen silicon particles according to claim 4 or 7, characterized in that: The impurity recovery trough is arranged below the impurity removal belt; the magnetic impurity collection trough is arranged below the demagnetization belt.

9. The device for removing impurities and demagnetizing fallen silicon particles according to claim 8, characterized in that: Baffles are arranged on both sides of the de-impurity belt and the demagnetization belt.

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