A pickling and impurity removing device for silicon micro powder production

Abstract

The utility model provides a pickling and impurity removing device for silicon powder production relates to silicon powder pickling technical field, including pickling tank, the pickling tank mouth lap joint has the open -work cylinder and the pickling tank outer box wall is hinged with the spray head for the plugging open -work cylinder cylinder mouth in the mouth part, the acid liquor containing impurity directly enters the filter jar in the circulation process, the solid impurity and part of the dissolved state metal ions are intercepted through the filter cylinder, avoid the impurity with the acid liquor backflow to the acid liquor tank, compared with the traditional pickling tank " the mode that the total amount of impurity is dissolved in the acid liquor", can significantly reduce the concentration of metal ions such as Fe 3 ⁺, Al 3 ⁺, Mg 2 ⁺ etc. in the acid liquor, delay the decline speed of the effective concentration of acid liquor, maintain stable pickling efficiency, the design of three -way valve cooperation two filter jars can control the flow of acid liquor through the switch valve, when the filter cylinder of one filter jar needs cleaning, can switch to another filter jar to continue filtering, need not interrupt pickling operation.

Description

Technical Field

[0001] This utility model relates to the field of silicon micropowder pickling technology, and in particular to a pickling and impurity removal device for silicon micropowder production. Background Technology

[0002] When removing impurities from silicon micro powder by acid washing, the carrier container is immersed in the acid washing tank. During the acid washing process, impurities fall off and deposit inside the carrier container. However, the fallen impurities can easily clog the filter screen of the carrier container, reducing the drainage efficiency. Therefore, an existing acid washing and impurity removal device for silicon carbide micro powder production, disclosed in CN221133369U, firstly adds acid to the acid washing tank, then adds the silicon carbide micro powder to be removed into the acid washing tank. Next, a cylinder drives a support plate to immerse the acid washing tank in the acidic solution of the acid washing tank. The acidic solution enters the acid washing tank through filter holes. A motor drives a primary rotating shaft to rotate, which in turn drives two secondary rotating shafts to rotate via a connecting plate. This, in turn, drives a stirring rod to rotate. Through meshing transmission, the stirring rod on the secondary rotating shaft rotates, thereby accelerating the dissolution rate of impurities and increasing the impurity removal efficiency. When the primary and secondary rotating shafts rotate, the primary rotating shaft, through the connecting plate, drives the two secondary rotating shafts to rotate around itself. This causes the strip-shaped brushes at the bottom of the primary and secondary rotating shafts to rotate around the center point, achieving simultaneous cleaning of the filter screen while accelerating impurity dissolution, thus avoiding filter screen clogging and slow drainage efficiency.

[0003] However, existing technology prevents filter clogging by dissolving impurities in the acidic solution of the pickling tank. As pickling progresses, if too many impurities are dissolved in the acidic solution, the dissolved metal ions (Fe2+) in the acid solution... 3 ⁺、Al 3 ⁺、Mg 2 (e.g., ⁺) will gradually accumulate, leading to a decrease in the effective concentration of acid and a slower pickling speed. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing an acid washing and impurity removal device for silicon micropowder production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an acid washing and impurity removal device for silicon micropowder production, comprising an acid washing tank, wherein a perforated cylinder is connected to the opening of the acid washing tank and a nozzle for sealing the opening of the perforated cylinder is hinged to the outer wall of the acid washing tank near the opening; a three-way valve is installed at the bottom of the acid washing tank, one of the valve ports of the three-way valve is connected to the acid washing tank, and the other two valve ports have built-in switch valves and are each equipped with connecting pipes; the ends of the two connecting pipes away from the three-way valve are connected to filter tanks; guide pipes are installed on the bottom edge of the walls of the two filter tanks; one end of the two guide pipes is connected to a transition tank; an inner tube coaxially distributed is fixedly installed at the top of the filter tank; the bottom opening of the inner tube penetrates the bottom of the filter tank and a filter cylinder with clearance fit is installed inside the inner tube; the opening of the filter cylinder faces upward and is connected to the connecting pipe; a piston block is hinged to the bottom of the filter cylinder and the sieve holes of the filter cylinder are distributed on the cylinder wall; and several drainage grooves are opened in the upper part of the inner wall of the inner tube.

[0006] Preferably, an acid tank is provided outside the pickling tank, and two pumps are provided on the acid tank. One pump is used to draw acid from the transition tank, and the other pump is used to connect to the nozzle.

[0007] Preferably, a stirring rod is rotatably connected to the center of the bottom of the hollow cylinder, and a locking block driven by a motor and inserted into the top of the central shaft of the stirring rod is installed on the inner side of the nozzle.

[0008] Preferably, an electric push rod for driving the piston block to rise and fall is fixedly installed on the outer wall of the filter tank, and a motor for driving the filter cylinder to rotate and swing is fixedly installed on the piston block. The filter cylinder opening and bottom side extend outward in the horizontal direction and are slidably connected to the inner wall of the inner tube.

[0009] Preferably, the inner wall of the filter cylinder is inclined near the cylinder opening, and the outer side of the filter cylinder wall is fitted with the inner wall of the inner tube with a clearance.

[0010] Preferably, the nozzle side is sloped and abuts against the inner wall of the hollow cylinder opening.

[0011] Preferably, one side of the nozzle is connected to the pump body via a hose, and the two sides of the nozzle are respectively hinged to one side of the pickling tank and connected to the other side via a pin.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this invention, the acid solution containing impurities directly enters the filter tank during the circulation process. The filter cartridge traps solid impurities and some dissolved metal ions, preventing impurities from flowing back to the acid tank with the acid solution. Compared to the traditional pickling tank method where "all impurities are dissolved in the acid solution," this significantly reduces the Fe content in the acid solution. 3 ⁺、Al 3 ⁺、Mg2 The concentration of metal ions such as ⁺ slows down the rate of decrease in the effective concentration of acid, maintaining a stable pickling efficiency. The three-way valve, combined with the design of two filter tanks, allows the flow of acid to be controlled by switching the valve on and off. When the filter cartridge of one filter tank needs cleaning, it can be switched to the other filter tank to continue filtration without interrupting the pickling operation.

[0013] 2. In this utility model, the acid solution is filtered and then returned to the acid solution tank through a transition tank, which reduces acid consumption and production costs; at the same time, it reduces waste acid emissions and reduces environmental protection pressure. Attached Figure Description

[0014] Figure 1 This utility model provides a three-dimensional structural schematic diagram of an acid washing and impurity removal device for silicon micropowder production; Figure 2 This utility model proposes an acid washing and impurity removal device for silicon micropowder production. Figure 1 A schematic diagram of the left-side view structure; Figure 3 This utility model proposes an acid washing and impurity removal device for silicon micropowder production. Figure 1 A schematic diagram of the cross-sectional structure; Figure 4 This is a cross-sectional view of the filter tank.

[0015] Legend: 1. Pickling tank; 2. Nozzle; 3. Acid tank; 4. Pump body; 5. Filter tank; 6. Connecting pipe; 7. Three-way valve; 8. Transition tank; 9. Guide pipe; 10. Electric push rod; 11. Stirring rod; 12. Hollow cylinder; 13. Inner tube; 14. Piston block; 15. Filter cylinder; 16. Drainage trough; 17. Locking block. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0018] like Figures 1-4As shown, an acid pickling and impurity removal device for silicon micropowder production includes an acid pickling tank 1. A perforated cylinder 12 overlaps the opening of the acid pickling tank 1, and a nozzle 2 for sealing the opening of the perforated cylinder 12 is hinged to the outer wall of the acid pickling tank 1 near the opening. The nozzle 2 has a sloping side that abuts against the inner wall of the opening of the perforated cylinder 12. One inlet of the nozzle 2 is connected to a pump body 4 via a flexible hose, and both sides of the nozzle 2 are hinged to one side of the acid pickling tank 1 and connected to the other side via a pin. In use, the silicon carbide micro powder waiting to be pickled is placed into the hollow cylinder 12. The hollow cylinder 12 is hoisted and installed in the pickling tank 1 by means of a crane or other means. The nozzle 2 is driven to rotate by a stepper motor installed on the pickling tank 1, so that the nozzle 2 rotates to press the opening of the hollow cylinder 12. The swing edge of the nozzle 2 is fixed to the outer wall of the pickling tank 1 by a pin. The pump body 4 is used to draw acid into the nozzle 2 and then spray it downward to rinse the silicon carbide micro powder in the hollow cylinder 12. A stirring rod 11 is rotatably connected to the center of the bottom of the hollow cylinder 12. A locking block 17, driven by a motor and inserted into the top of the central shaft of the stirring rod 11, is installed inside the nozzle 2. After the hollow cylinder 12 is installed, the direction of the stirring rod 11 is manually rotated to ensure that the locking block 17 on the surface of the nozzle 2 smoothly inserts into the top of the central shaft of the stirring rod 11 when the nozzle 2 is closed. The locking block 17 can then be rotated by a motor installed on the outside of the nozzle 2, thus rotating the stirring rod 11 to agitate the silicon carbide powder and ensuring a good rinsing effect. A three-way valve 7 is installed at the bottom of the pickling tank 1. One port of the three-way valve 7 is connected to the pickling tank 1, and the other two ports have built-in switch valves and are each equipped with a connecting pipe 6. The ends of the two connecting pipes 6 furthest from the three-way valve 7 are connected to a filter tank 5. When rinsing the silicon carbide powder, impurities will enter the pickling tank 1 through the perforated sieve holes on the side of the hollow cylinder 12 along with the acid, and then enter the corresponding connecting pipe 6 through the three-way valve 7. The acid solution is filtered in filter tank 5. In addition, the switch valve in the three-way valve 7 allows the acid solution mixed with impurities to be selectively entered into the corresponding filter tank 5. Both filter tanks 5 are equipped with guide pipes 9 at the bottom of their walls. One end of the two guide pipes 9 is connected to the transition tank 8. An acid tank 3 is set outside the pickling tank 1. Two pumps 4 are set on the acid tank 3. One pump 4 is used to draw the acid solution in the transition tank 8, and the other pump 4 is used to connect to the nozzle 2. The acid solution filtered by the filter tank 5 is concentrated into the transition tank 8 along the guide pipes 9. Then, under the pumping action of one of the pumps 4, it enters the acid tank 3 for collection. Under the action of the other pump 4, it enters the nozzle 2. The pump 4 used in this scheme is a commercially available pump specifically designed for transporting acidic solutions. An inner tube 13 is fixedly installed at the top of the filter tank 5, with its bottom opening penetrating the bottom of the filter tank 5. A filter cylinder 15 with clearance fit is installed inside the inner tube 13, with the opening of the filter cylinder 15 facing upward and connected to the connecting pipe 6. A piston block 14 is hinged to the bottom of the filter cylinder 15, and the sieve holes of the filter cylinder 15 are distributed on the cylinder wall. Several drainage grooves 16 are opened in the upper part of the inner wall of the inner tube 13. The liquid entering the filter tank 5 first enters the filter cylinder 15 in the inner tube 13, and after being filtered by the filter cylinder 15, it passes through the drainage grooves 16 on the surface of the inner tube 13 and enters the filter tank 5, and then flows out along the guide pipe 9.

[0019] An electric push rod 10 for driving the piston block 14 to rise and fall is fixedly installed on the outer wall of the filter tank 5. A motor for driving the filter cylinder 15 to rotate and swing is fixedly installed on the piston block 14. The opening and bottom side of the filter cylinder 15 extend outward in the horizontal direction and are slidably connected to the inner wall of the inner tube 13. The inner wall of the filter cylinder 15 is inclined near the opening, and the outer side of the filter cylinder 15 is in clearance fit with the inner wall of the inner tube 13. When the injection of acidic solution into the filter tank 5 stops, the electric push rod 10 extends, causing the piston block 14 to drive the filter cylinder 15 to descend and disengage from the inner tube 13. Then, by installing a motor on the piston block 14, the filter cylinder 15 is driven to rotate and swing downward, so that the impurities trapped in the filter cylinder 15 can be discharged from the filter cylinder 15 by shaking or rinsing, which makes it convenient for the filter cylinder 15 to be recycled.

[0020] The method of using this utility model is as follows: Loading and Equipment Preparation: Place the silicon carbide micro powder to be pickled into the hollow cylinder 12, and use a crane or other equipment to hoist the hollow cylinder 12 into the pickling tank 1, ensuring that the hollow cylinder 12 overlaps with the opening of the pickling tank 1, and manually adjust the direction of the stirring rod 11 inside the hollow cylinder 12. Installation and fixing of nozzle 2: The nozzle 2 is driven to rotate by a stepper motor, so that it presses against the opening of the hollow cylinder 12. The side of the nozzle 2 abuts against the inner wall of the hollow cylinder 12, and the swinging side of the nozzle 2 is fixed to the outer wall of the pickling tank 1 by a pin. Pickling operation: Start the pump body 4 to draw acid from the acid tank 3 into the nozzle 2. The acid is sprayed downward to rinse the silicon carbide micro powder in the hollow cylinder 12. At the same time, start the motor on the outside of the nozzle 2, and drive the stirring rod 11 to rotate through the locking block 17 to stir the micro powder to enhance the rinsing effect. Acid filtration and circulation: The acid solution containing impurities enters the pickling tank 1 through the perforated cylinder 12, and is selected by the three-way valve 7 to enter one of the filter tanks 5; the acid solution first enters the inner tube 13 and filter cylinder 15 of the filter tank 5, and after filtration, it flows into the filter tank 5 through the drain trough 16 of the inner tube 13, and then flows into the transition tank 8 through the guide pipe 9; finally, the acid solution in the transition tank 8 is pumped back to the acid tank 3 by the pump body 4 to achieve recycling; Cleaning of filter cartridge 15: When it is necessary to clean impurities, close the switch valve of the corresponding filter tank 5 to stop the liquid inlet; the electric push rod 10 extends to make the piston block 14 drive the filter cartridge 15 to descend and separate from the inner tube 13, start the motor on the piston block 14 to drive the filter cartridge 15 to rotate and swing, and discharge the trapped impurities by shaking or rinsing. After cleaning, reset the filter cartridge 15 for the next use.

[0021] The wiring diagrams for the motor, pump body 4, electric push rod 10, and switching valve in this utility model are common knowledge in the field. Their working principles are known technologies. The appropriate model is selected according to actual use. Therefore, the control methods and wiring layouts for the motor, pump body 4, electric push rod 10, and switching valve will not be explained in detail.

[0022] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An acid washing and impurity removal device for silicon micropowder production, characterized in that: The system includes a pickling tank (1), with a perforated cylinder (12) attached to the opening of the tank. A nozzle (2) for sealing the opening of the perforated cylinder (12) is hinged to the outer wall of the tank (1) near the opening. A three-way valve (7) is installed at the bottom of the tank (1). One of the valve ports of the three-way valve (7) is connected to the pickling tank (1), and the other two valve ports have built-in switch valves and are each equipped with a connecting pipe (6). The ends of the two connecting pipes (6) away from the three-way valve (7) are connected to filter tanks (5). A guide pipe (9) is installed on the bottom edge of the walls of the two filter tanks (5). Two guide pipes (9) are connected to a transition tank (8) at one end. The filter tank (5) is fixedly installed with an inner tube (13) distributed coaxially. The bottom opening of the inner tube (13) penetrates the bottom of the filter tank (5) and a filter cylinder (15) with clearance fit is installed inside the inner tube (13). The opening of the filter cylinder (15) faces upward and is connected to the connecting pipe (6). A piston block (14) is hinged to the bottom of the filter cylinder (15) and the sieve holes of the filter cylinder (15) are distributed on the cylinder wall. Several drainage grooves (16) are opened in the upper part of the inner wall of the inner tube (13).

2. The acid washing and impurity removal device for silicon micropowder production according to claim 1, characterized in that: An acid tank (3) is provided outside the pickling tank (1). Two pump bodies (4) are provided on the acid tank (3). One pump body (4) is used to draw acid from the transition tank (8), and the other pump body (4) is used to connect the nozzle (2).

3. The acid washing and impurity removal device for silicon micropowder production according to claim 1, characterized in that: The hollow cylinder (12) has a stirring rod (11) rotatably connected to the center of the bottom of the inner cylinder, and the nozzle (2) has a locking block (17) installed on the inner side, which is driven by a motor and inserted into the top of the central shaft of the stirring rod (11).

4. The acid washing and impurity removal device for silicon micropowder production according to claim 1, characterized in that: An electric push rod (10) for driving the piston block (14) to rise and fall is fixedly installed on the outer wall of the filter tank (5). A motor for driving the filter cylinder (15) to rotate and swing is fixedly installed on the piston block (14). The filter cylinder (15) has its opening and bottom side extending outward in the horizontal direction and slidingly connected to the inner wall of the inner tube (13).

5. The acid washing and impurity removal device for silicon micropowder production according to claim 4, characterized in that: The inner wall of the filter cylinder (15) is inclined near the opening, and the outer side of the filter cylinder (15) is fitted with the inner wall of the inner tube (13) with a clearance.

6. The acid washing and impurity removal device for silicon micropowder production according to claim 1, characterized in that: The nozzle (2) has a sloping side and the side of the nozzle (2) abuts against the inner wall of the opening of the hollow cylinder (12).

7. The acid washing and impurity removal device for silicon micropowder production according to claim 1, characterized in that: The nozzle (2) has one inlet connected to the pump body (4) via a hose, and the nozzle (2) is hinged to one side of the pickling tank (1) and connected to the other side via a pin.

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