Silicon powder processing production line

Abstract

The utility model provides a silicon powder processing production line which comprises a main processing line, a first auxiliary processing line and a second auxiliary processing line, wherein the first auxiliary processing line and the second auxiliary processing line are communicated with the main processing line; the main processing line comprises a raw material bin, a first jaw crusher, a first surge bin, a first roll crusher, a second surge bin and a rocking screen which are sequentially communicated, and the first auxiliary processing line comprises a third surge bin and a first finished product bin which are sequentially communicated; the second auxiliary processing line comprises a fourth surge bin, a jet mill and an airflow classifier which are communicated in sequence, a first discharging port of the airflow classifier is communicated to a cloth bag dust collector, and a second discharging port of the airflow classifier is communicated to a feeding port of the swinging screen through a fifth bucket elevator and an eighth conveyor. Through the mode, silicon powder particles are repeatedly ground, the particle uniformity in the silicon powder crushing process is improved, and the silicon powder processing yield and recovery rate are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal silicon powder processing, in particular to a silicon powder processing production line. Background Art

[0002] Metallic silicon is a product smelted from quartz and coke in an electric furnace. The content of the main component silicon is about 98%. It is the raw material of ultra-pure silicon in the electronics industry and the basic raw material of the solar photovoltaic industry. Silicon powder is a metal silicon particle with certain particle size requirements prepared by different physical and chemical methods. The microstructure, specific surface area and particle size of silicon powder directly affect the application of silicon powder in the downstream deep processing industry. At present, the domestic existing technology for crushing metallic silicon has made substantial progress after several years of development. The more representative ones are Raymond mill, disc mill (vertical mill), roller mill, impact mill, etc.

[0003] In the traditional silicon powder processing process, silicon blocks are usually directly screened after single mechanical crushing, which is prone to incomplete crushing of silicon blocks and uneven crushing particle size, which leads to unreasonable crushing ratio, excessive consumption of silicon raw materials, waste of waste resources, low production efficiency, etc. At the same time, there is dust pollution in the silicon powder processing process, which is easy to affect the health of operators and the surrounding environment if it is not handled in time. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a silicon powder processing production line which can effectively improve the utilization rate of raw materials.

[0005] The main contents of the utility model include: a main processing line, a first auxiliary processing line and a second auxiliary processing line interconnected with the main processing line;

[0006] The main processing line includes a raw material bin, a first jaw crusher, a first buffer bin, a first pair of roller crushers, a second buffer bin and a swing screen which are sequentially connected and arranged, and the swing screen includes a screen mesh, and the screen mesh separates the inside of the swing screen from top to bottom into a secondary powder chamber and a primary powder chamber;

[0007] The input end of the first auxiliary processing line is connected to the discharge end of the primary powder chamber, and the first auxiliary processing line includes a third buffer bin, a drum magnetic separator and a first finished product bin which are connected in sequence;

[0008] The input end of the second processing line is connected to the discharge end of the secondary powder chamber, the second processing line comprises a fourth buffer bin, a jet mill and an airflow classifier which are connected in sequence, the first discharge port of the airflow classifier is connected to a bag dust collector, and the second discharge port of the airflow classifier is connected to the feed port of the swing screen through a fifth bucket elevator and an eighth conveyor;

[0009] The raw material bin, the first jaw crusher, the first pair of roller crushers, and the swing screen are all provided with dust extraction ports, the dust extraction ports are connected to the cyclone dust collector, and the cyclone dust collector is connected to the centrifugal fan;

[0010] The air inlet of the jet mill is connected to a Roots blower, and the air outlet of the bag dust collector is connected to an induced draft fan.

[0011] Preferably, a first conveyor is arranged between the raw material bin and the first jaw crusher, a first bucket elevator is arranged between the first jaw crusher and the first buffer bin, a second conveyor is arranged between the first buffer bin and the first pair of roller crusher, a third conveyor and a second bucket elevator are arranged in communication between the first pair of roller crusher and the second buffer bin, and a fourth conveyor is arranged in communication between the second buffer bin and the swing screen.

[0012] Preferably, a fifth conveyor and a third bucket elevator are connected between the third buffer bin and the drum magnetic separator for transmitting silicon powder.

[0013] Preferably, a sixth conveyor, a fourth bucket elevator and a seventh conveyor are sequentially connected between the fourth buffer bin and the jet mill for transmitting silicon powder.

[0014] Preferably, the seventh conveyor is provided with a permanent magnetic iron removal device for removing iron and impurities from the silicon powder.

[0015] Preferably, a dust extraction pipe is correspondingly arranged on the dust extraction port, and a plurality of the dust extraction pipes are connected to a dust removal main pipe, and the dust removal main pipe is connected to the cyclone dust collector.

[0016] Preferably, in the first jaw crusher, the width of the jaw crusher discharge port is 15 mm.

[0017] Preferably, in the first pair of roller crusher, the roller gap width between the two pairs of rollers is 3 mm.

[0018] Preferably, the mesh size of the screen inside the swing screen is 35 meshes.

[0019] The beneficial effects of the utility model are: the silicon block is coarsely crushed by the first jaw crusher, the silicon block is finely crushed by the first pair of roller crushers, and then the swing screen is used for screening, and then the jet mill is used for reflux composite screening and grinding of part of the silicon powder, the crushing ratio is large, the grinding and screening circulation volume is high, the final finished product rate is effectively improved, and the waste of raw materials is reduced;

[0020] Throughout the entire production process, cyclone dust collectors are used in conjunction with dust extraction pipes to remove dust from the production line, effectively reducing dust emissions, preventing environmental pollution, and ensuring safety and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a top view of a preferred embodiment;

[0022] Figure 2 This is a schematic diagram of the side structure of a preferred embodiment;

[0023] Figure 3 This is a schematic diagram of a fan connection structure of a preferred embodiment;

[0024] Figure 4 A schematic diagram of a flow chart of a preferred embodiment;

[0025] Reference numerals:

[0026] 1. Raw material bin; 2. First conveyor; 3. First jaw crusher; 4. First bucket elevator; 5. First buffer bin; 6. Second conveyor; 7. First roller crusher; 8. Third conveyor; 9. Second bucket elevator; 10. Second buffer bin; 11. Fourth conveyor; 12. Swing screen;

[0027] 13. The third bucket elevator; 14. The first finished product warehouse;

[0028] 20. Fourth bucket elevator; 21. Jet mill; 22. Fifth bucket elevator; 23. Eighth conveyor; 24. Airflow classifier; 25. Bag dust collector;

[0029] 31. Roots blower; 32. induced draft fan; 33. dust removal pipe; 34. cyclone dust collector; 35. centrifugal fan. DETAILED DESCRIPTION

[0030] The technical solution protected by the utility model is described in detail below with reference to the accompanying drawings.

[0031] like Figure 1-3 As shown, the present application relates to a silicon powder processing production line, comprising: a main production line and a first sub-production line and a second sub-production line connected to the output end of the main production line. The main production line is used for preliminarily crushing and rolling silicon blocks and then screening them. After silicon powder particles of different mesh sizes are screened out, they are subsequently processed in the first sub-production line and the second sub-production line respectively.

[0032] like Figure 1-3As shown, the main production line includes a raw material bin 1, a first jaw crusher 3, a first buffer bin 5, a first pair of roller crushers 7, a second buffer bin 10 and a swing screen 12. The first jaw crusher 3 is used to coarsely crush the silicon blocks, and then the first pair of roller crushers 7 further crush the silicon blocks and then screen the silicon blocks by the swing screen 12 to improve the crushing ratio of the silicon raw materials. A first conveyor 2 is arranged between the raw material bin 1 and the first jaw crusher 3. The output end of the raw material bin 1 is connected to the input end of the first conveyor 2, and the output end of the first conveyor 2 is connected to the input end of the first jaw crusher 3. The first conveyor 2 transmits the silicon blocks by vibration. During the transmission process, the silicon block raw materials can be preliminarily sorted manually to prevent the presence of large foreign objects from causing damage to the subsequent crusher and affecting the purity of the finished product. A first bucket elevator 4 is arranged between the first jaw crusher 3 and the first buffer bin 5. The first bucket elevator 4 is used to lift the coarsely crushed silicon blocks in the first jaw crusher 3 and introduce them into the first buffer bin 5. The first buffer bin 5 is used for temporary storage of the coarsely crushed silicon blocks. A second conveyor 6 is provided between the first buffer bin 5 and the first pair of roller crusher 7 to transfer the roughly crushed silicon blocks to the first pair of roller crusher 7 for secondary fine crushing. A third conveyor 8 for conveying and feeding and a second bucket elevator 9 for lifting silicon materials are provided between the first pair of roller crusher 7 and the second buffer bin 10 to lift the finely crushed silicon materials and place them in the second buffer bin 10. A fourth conveyor 11 is provided between the second buffer bin 10 and the swing screen 12 to transfer silicon materials. Preferably, the crushing degree and particle size of the silicon sand material can be regulated by the size of the jaw crusher discharge port, the size of the roller gap and the size of the spring pressure. In this embodiment, the width of the jaw crusher discharge port of the first jaw crusher 3 is 15 mm, which can roughly crush the silicon blocks to a diameter less than 15 mm, and the roller gap width between the two pairs of rollers of the first pair of roller crusher 7 is 3 mm, which can further crush the silicon blocks to a diameter less than 3 mm.

[0033] like Figure 1-3 As shown, the swing screen 12 is built with a screen, which divides the interior of the swing screen 12 from top to bottom into a secondary powder chamber and a primary powder chamber for accommodating silicon powder particles of different diameters. In this embodiment, the mesh number of the screen is specifically set to 35 meshes. The discharge end of the primary powder chamber is connected to the first auxiliary processing line, and the discharge end of the secondary powder chamber is connected to the second auxiliary processing line.

[0034] like Figure 1-3As shown, the first secondary processing line includes a third buffer bin, a fifth conveyor, a third bucket elevator 13 and a first finished product bin 14 which are interconnected in sequence. The first-level powder chamber is used to receive the silicon powder under the screen, and the discharge end of the first-level powder chamber is interconnected with the feed end of the third buffer bin. The screened silicon powder is placed in the third buffer bin for temporary buffering, and then evenly transported by the fifth conveyor and then lifted by the third bucket elevator 13 and placed in the first finished product bin 14. Preferably, a drum magnetic separator (not shown) is provided between the third bucket elevator 13 and the first finished product bin 14, which is used to perform permanent magnetic iron removal before the silicon powder enters the first finished product bin 14 to complete the finished product impurity removal.

[0035] like Figure 1-3 As shown, the second processing line includes the fourth buffer bin, the sixth conveyor, the fourth bucket elevator 20, the seventh conveyor, the jet mill 21 and the airflow classifier 24 which are interconnected in sequence. The fine powder discharge port of the airflow classifier 24 is connected to the bag dust collector 25. The fine powder is screened by the internal rotating fence and enters the bag dust collector 25 for collection. The coarse powder discharge port of the airflow classifier 24 is connected to the feed port of the swing screen 12 through the fifth bucket elevator 22 and the eighth conveyor 23, realizing a closed cycle, repeatedly grinding the silicon powder with a larger particle size to improve the yield. Preferably, a permanent magnetic iron removal device is provided on the seventh conveyor to remove iron from the silicon powder before entering the jet mill 21.

[0036] like Figure 3 As shown, the air inlet pipe of the jet mill 21 is interconnected with the Roots blower 31. The Roots blower 31 generates high-speed compressed air, which forms a jet effect between the compression chamber and the material in the feed pipe, and hits the target at high speed, thereby further crushing the silicon powder particles. The air outlet of the bag dust collector 25 is connected to the induced draft fan 32 through the air duct to form a negative pressure to ensure the dust filtering and dust removal effect. The airflow enters the jet mill 21 from the Roots blower 31, and then flows out from the induced draft fan 32 after passing through the airflow classifier 24 and the bag integrator 25, thereby forming a complete airflow circulation route, so as to better recover the fine silicon powder and dust in the pipeline.

[0037] like Figure 1-2 As shown, several buffer bins in the production line are used to receive silicon block particles that are in different processing stages and have completed the previous processing step, and play a temporary storage role to prevent excessive discharge in a certain link, which would cause excessive operation of the transmission machinery, damage the machinery, and affect the overall processing efficiency.

[0038] like Figure 1-3As shown, the raw material warehouse 1, the first jaw crusher 3, several bucket elevators, the first pair of roller crushers 7, the swing screen 12 and several buffer warehouses are all equipped with dust extraction ports (not shown), and dust extraction pipes are correspondingly configured on the dust extraction ports. The several dust extraction pipes are all connected to a dust removal main pipe 33, and the end of the dust removal main pipe 33 is connected to a cyclone dust collector 34. The cyclone dust collector 34 is connected to a centrifugal fan 35 to collect dust generated during the raw material warehouse feeding, jaw crusher feeding, bucket elevator unloading, pair of roller feeding, screening feeding, etc., to prevent dust from being discharged into the atmosphere, causing environmental pollution and harm to the human body. The collected dust can be recycled into SC by-products to improve the recovery rate and reduce the waste of raw materials.

[0039] The specific processing process is Figure 4 As shown: the silicon block products in the raw material bin 1 are transported to the first jaw crusher 3 through the first conveyor 2. During the process of the first conveyor 2 vibrating and transporting the silicon blocks, the silicon blocks are manually sorted and impurities are removed and permanent magnetic iron removal is performed to reduce impurities in the raw materials and improve the purity of the subsequent finished products. The first jaw crusher 3 performs coarse crushing on the silicon blocks, effectively crushing large silicon blocks into silicon block particles with a diameter of less than 15mm. The silicon block particles are then lifted by the first bucket elevator 4 to the first buffer bin 5 for temporary buffer storage. The discharge port of the first buffer bin 5 is connected to the input end of the first pair of roller crushers 7 through the second conveyor 6. The silicon block particles enter the first pair of roller crushers 7 for crushing and fine crushing, effectively crushing the diameter of the silicon block particles to less than 3mm. The crushed silicon powder is evenly transferred to the second bucket elevator 9 through the third conveyor 8. The second bucket elevator 9 then lifts the silicon powder to the second buffer bin 10 for temporary buffer storage, and then is transferred to the swing screen 12 through the fourth conveyor 11 to screen the silicon powder particles with a diameter of less than 3 mm.

[0040] The silicon powder under the 35-mesh sieve falls into the primary powder chamber of the swing screen 12 and is transmitted to the third buffer bin through a pipeline, and then transmitted to the third bucket elevator through the fifth conveyor. The silicon powder is lifted into the drum magnetic separator by the third bucket elevator, and is further deironed and then transmitted to the first finished product bin.

[0041] The silicon powder on the 35-mesh sieve is placed in the secondary powder chamber of the swing screen 12, and falls into the fourth buffer bin from the second discharge port after continuous tumbling, and is then transmitted to the fourth bucket elevator through the sixth conveyor. The fourth bucket elevator lifts the silicon powder to the seventh conveyor for transmission and simultaneously performs permanent magnetic iron removal treatment before being transmitted to the jet mill 21 for further fine grinding. The silicon powder is screened by the airflow classifier 24, and the fine powder passing through the 300-mesh rotating fence can be collected in the bag dust collector. The silicon powder particles larger than 300 mesh are vibrated and input into the swing screen through the fifth bucket elevator 22 and the eighth conveyor 23, forming a closed-loop powder making with the jet mill 21 and repeated grinding.

[0042] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A silicon powder processing production line, characterized in that: Mainly include: A main processing line, a first sub-processing line and a second sub-processing line interconnected with the main processing line; The main processing line includes a raw material bin, a first jaw crusher, a first buffer bin, a first pair of roller crushers, a second buffer bin and a swing screen which are sequentially connected and arranged, and the swing screen includes a screen mesh, and the screen mesh separates the inside of the swing screen from top to bottom into a secondary powder chamber and a primary powder chamber; The input end of the first auxiliary processing line is connected to the discharge end of the primary powder chamber, and the first auxiliary processing line includes a third buffer bin, a drum magnetic separator and a first finished product bin which are connected in sequence; The input end of the second processing line is connected to the discharge end of the secondary powder chamber, and the second processing line includes a fourth buffer bin, a jet mill and an airflow classifier which are connected in sequence, the fine powder discharge port of the airflow classifier is connected to a bag dust collector, and the coarse powder discharge port of the airflow classifier is connected to the feed port of the swing screen through a fifth bucket elevator and an eighth conveyor; The raw material bin, the first jaw crusher, the first pair of roller crushers, and the swing screen are all provided with dust extraction ports, the dust extraction ports are connected to the cyclone dust collector, and the cyclone dust collector is connected to the centrifugal fan; The air inlet of the jet mill is connected to a Roots blower, and the air outlet of the bag dust collector is connected to an induced draft fan.

2. A silicon powder processing production line according to claim 1, characterized in that: A first conveyor is arranged between the raw material bin and the first jaw crusher, a first bucket elevator is arranged between the first jaw crusher and the first buffer bin, a second conveyor is arranged between the first buffer bin and the first pair of roller crusher, a third conveyor and a second bucket elevator are arranged between the first pair of roller crusher and the second buffer bin, and a fourth conveyor is arranged between the second buffer bin and the swing screen.

3. A silicon powder processing production line according to claim 1, characterized in that: A fifth conveyor and a third bucket elevator are connected between the third buffer bin and the drum magnetic separator for transmitting silicon powder.

4. A silicon powder processing production line according to claim 1, characterized in that: The sixth conveyor, the fourth bucket elevator and the seventh conveyor are sequentially connected between the fourth buffer bin and the jet mill for transmitting silicon powder.

5. A silicon powder processing production line according to claim 4, characterized in that: The seventh conveyor is provided with a permanent magnetic iron removal device for removing iron and impurities from silicon powder.

6. The silicon powder processing production line according to claim 1, characterized in that: A dust extraction pipe is correspondingly arranged on the dust extraction port, and a plurality of the dust extraction pipes are connected to a dust removal main pipe, and the dust removal main pipe is connected to the cyclone dust collector.

7. The silicon powder processing production line according to claim 1, characterized in that: In the first jaw crusher, the width of the jaw crusher discharge port is 15 mm.

8. The silicon powder processing production line according to claim 1, characterized in that: In the first pair of roller crusher, the roller gap width between the two pairs of rollers is 3 mm.

9. The silicon powder processing production line according to claim 1, characterized in that: The mesh number of the screen inside the swing screen is 35 meshes.

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