Waste liquid recovery equipment for production of superfine high-purity spherical silica powder

Abstract

The invention relates to the technical field of silicon powder waste liquid recycling and reusing, in particular to waste liquid recycling equipment for superfine high-purity spherical silicon micropowder production, which comprises a waste liquid tank and a main shaft, a negative pressure system capable of rotating along with the main shaft is arranged on the main shaft, and a plurality of filter discs arranged around the main shaft at equal intervals are arranged on the main shaft. An adjusting assembly for adjusting the adsorption pressure of the filter disc to silicon dioxide is arranged between each filter disc and the negative pressure system, and the negative pressure of the filter disc at different stages is dynamically regulated and controlled through the adjusting assemblies, so that the equipment can automatically match the optimal adsorption force according to the position and the working state of the filter disc; therefore, the whole system is prevented from being in a high negative pressure state for a long time, energy consumption and mechanical abrasion are reduced, and the service life of equipment is prolonged. Through the mode, the silicon powder can be stably and uniformly separated and dried in each cycle, so that efficient and continuous recovery of the silicon powder in the waste liquid is realized, the production cost is further reduced, and the resource utilization rate is improved.

Description

Technical Field

[0001] The invention relates to the technical field of recycling and reusing silicon powder waste liquid, and in particular to a waste liquid recycling device used for producing ultrafine high-purity spherical silicon micropowder. Background Art

[0002] There is no recycling equipment for silicon powder in the current market. Most of them require chemical methods. This method will turn traditional solid waste into hazardous waste, and turn traditional silicon powder waste into fluoride silicon waste liquid. The treatment cost is greatly increased, which is unsafe and environmentally unfriendly. 1. Since waste liquid with cutting fluid is generated after silicon material cutting, the waste liquid cannot meet the direct discharge standard. At present, most of them are treated by traditional methods, which are treated by adding chemical reagents. A certain specific raw material is added to the silicon powder waste liquid to make it produce chemical reactions and then precipitate. Since the addition of chemical reagents produces chemical reactions, the original silicon powder solid waste becomes hazardous waste, so the treatment cost is greatly increased. 2. Recover silicon powder by precipitation. Chinese patent authorization announcement number CN109704342B discloses a silicon powder waste liquid recovery device, including a liquid storage mechanism, a filtering mechanism arranged on the liquid storage mechanism, a pumping mechanism connected to the filtering mechanism, a bubbling mechanism arranged in the liquid storage mechanism, a silicon powder cleaning mechanism matched with the disc of the filtering mechanism, a silicon powder transmission mechanism arranged at the lower end of the liquid storage mechanism, and a vacuum packaging mechanism connected to the silicon powder transmission mechanism; this invention separates waste liquid into water and silicon powder through a filter plate to realize waste utilization, but because a plurality of fan-shaped filter plates constitute an overall disc-shaped structure, the filter plate will be immersed in the feed liquid of the waste liquid tank in a sideways manner, and the immersed feed liquid will be immersed in the feed liquid of the waste liquid tank. When the liquid is immersed in the feed liquid, negative pressure adsorption makes the liquid pass through the filter membrane vertically, and silicon powder is deposited on the surface of the filter plate. The fluid flow direction is perpendicular to the filter membrane surface, which is a typical dead-end filtration. The vertical deposition of silicon powder particles can easily block the pores of the filter plate. The machine needs to be shut down for backwashing every 1 to 2 hours, which affects continuous production. In addition, the negative pressure system cannot adjust the adsorption force of the filter disc. Once the filter disc is immersed in the feed liquid, silicon dioxide quickly forms an adsorption layer on its surface, resulting in uneven distribution of the adsorption layer. At the same time, when the filter disc is separated from the liquid surface, due to the lack of pressure regulation, the moisture in the adsorption layer is quickly absorbed, resulting in the problem of premature falling off before reaching the designated collection area. Summary of the invention

[0003] In view of the above problems, a waste liquid recovery device for the production of ultrafine high-purity spherical silicon micropowder is provided. The negative pressure of the filter disc at different stages is dynamically regulated by adjusting the components, so that the device can automatically match the optimal adsorption force according to the position and working state of the filter disc, thereby avoiding the entire system being in a high negative pressure state for a long time, reducing energy consumption and mechanical wear, and extending the life of the equipment. In this way, the silicon powder can be stably and evenly separated and dried in each cycle, realizing efficient and continuous recovery of silicon powder in waste liquid, further reducing production costs and improving resource utilization.

[0004] To solve the problems of the existing technology, the present invention provides a waste liquid recovery device for the production of ultra-fine high-purity spherical silica powder, which includes a waste liquid tank and a main shaft horizontally arranged in the waste liquid tank. A negative pressure system that can rotate with the main shaft is arranged on the main shaft. A plurality of filter discs are arranged on the main shaft at equal intervals around it. All the filter discs are connected to the negative pressure system. The filter discs are installed on the main shaft in an inclined posture, and a specific angle can be formed between two adjacent filter discs. When the filter discs rotate with the main shaft, the inclined surface of the filter discs can form a cross-flow angle with the liquid material after being immersed in the waste liquid tank, and cooperate with the negative pressure system to enable the filter discs to adsorb silicon dioxide in the liquid material through their surfaces; a regulating component for regulating the adsorption pressure of the filter discs on silicon dioxide is arranged between each filter disc and the negative pressure system.

[0005] Preferably, the filter discs are rotatably arranged on the main shaft, and a scraping mechanism for scraping and collecting the adsorption layer formed on the surface of the filter discs is arranged at the top of the waste liquid tank; when the filter discs rotate to the position of the scraping mechanism, they can adjust their postures to a state adapted to the scraping mechanism, so that the scraping mechanism can clean the adsorption layer on the surface of the filter discs.

[0006] Preferably, an installation pipe is arranged at the bottom of the filter disc. The installation pipe is rotatably sleeved on the negative pressure system and is hermetically connected to the negative pressure system. A gear is fixedly connected to the outside of the installation pipe, and a rack meshed with the gear is arranged on the main shaft.

[0007] Preferably, the rack can slide along the axis direction of the main shaft. A limiting block is arranged at the end of the rack, an elastic member is arranged between the limiting block and the main shaft, and an arc-shaped driving block capable of driving the rack to slide along the main shaft direction is arranged on the inner wall of the waste liquid tank.

[0008] Preferably, the regulating component includes an electric controller and a valve. The valve is sleeved between the negative pressure system and the installation pipe of the filter disc, and the opening degree of the valve is controlled by the electric controller to regulate the adsorption pressure of the filter disc on silicon dioxide.

[0009] Preferably, a plurality of spray heads for driving the liquid material to flow are arranged at the bottom of the waste liquid tank.

[0010] Preferably, the scraping mechanism includes a collection tank and two elastically deformable and mirror-symmetrical scraping plates. The bottom surface of the collection tank is inclined, and the collection tank is connected to an external driving mechanism. The external driving mechanism can create a negative pressure environment in the collection tank to facilitate the collection of the dry silicon powder scraped from the surface of the filter discs.

[0011] Preferably, a guide pipe is arranged at the bottom of the collection tank, a conveying mechanism is arranged beside the waste liquid tank, and the diversion pipe is connected to the conveying mechanism.

[0012] Preferably, a sensor for detecting the position of the filter disc is also arranged on the filter disc.

[0013] Preferably, a plurality of annular mounting brackets for supporting the filter plates are arranged on the main shaft at equal intervals along its axis.

[0014] The beneficial effects of the present invention compared with the prior art are as follows: 1. The present invention realizes the dynamic regulation of the negative pressure of the filter disc at different stages through the adjustment component, enabling the equipment to automatically match the optimal adsorption force according to the position and working state of the filter disc, thereby avoiding the entire system being in a high negative pressure state for a long time, reducing energy consumption and mechanical wear, and extending the service life of the equipment. In the above way, the silicon powder can be stably and evenly separated and dried in each cycle, realizing the efficient and continuous recovery of the silicon powder in the waste liquid, further reducing the production cost and improving the resource utilization rate.

[0015] 2. The present invention adjusts the attitude of the filter disc, enabling the scraping mechanism to act evenly on the surface of the filter disc, effectively avoiding incomplete cleaning caused by the angle problem of the inclined filter disc, and improving the recovery rate of silicon powder. The adjustable setting of the filter disc scheduling ensures that the filter disc maintains the optimal inclination angle during filtration and can restore the angle during cleaning, optimizing the entire filtration and cleaning process and improving the stability of the equipment.

[0016] 3. The present invention precisely adjusts the valve opening through the electric controller, enabling the filter disc to have different adsorption pressures at different working stages, ensuring uniform deposition of silicon powder particles, reducing local blockage phenomena, and improving filtration stability. Through the spray head, the two sides of the filter disc can be guided, promoting a better cross-flow effect of the liquid on the surface of the filter disc to enhance the adsorption effect of the filter disc on silicon dioxide in the liquid. Through the setting of the sensor, it monitors whether the filter disc reaches the cleaning mechanism to ensure accurate operation of the scraping mechanism and improve the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of a waste liquid recovery device for the production of ultra-fine high-purity spherical silicon micropowder.

[0018] Figure 2 is a top view of a waste liquid recovery device for the production of ultra-fine high-purity spherical silicon micropowder.

[0019] Figure 3 is a front view of a waste liquid recovery device for the production of ultra-fine high-purity spherical silicon micropowder.

[0020] Figure 4 is a three-dimensional sectional structural schematic diagram of a waste liquid recovery device for the production of ultra-fine high-purity spherical silicon micropowder.

[0021] Figure 5 is a three-dimensional structural schematic diagram inside the waste liquid tank of a waste liquid recovery device for the production of ultra-fine high-purity spherical silicon micropowder.

[0022] Figure 6It is a schematic three-dimensional structure diagram of a partial scraping mechanism and filter plate in a waste liquid recovery device for the production of ultra-fine high-purity spherical silica powder.

[0023] Figure 7 It is a schematic three-dimensional structure diagram of a main shaft and a negative pressure system in a waste liquid recovery device for the production of ultra-fine high-purity spherical silica powder.

[0024] Figure 8 It is Figure 4 An enlarged view of part A in

[0025] Figure 9 It is Figure 6 An enlarged view of part B in

[0026] Figure 10 It is Figure 7 An enlarged view of part C in

[0027] The reference numerals in the figure are: 1. Waste liquid tank; 11. Main shaft; 111. Rack; 1111. Limit block; 1112. Elastic member; 112. Ring-shaped mounting frame; 12. Negative pressure system; 13. Arc-shaped driving block; 14. Sprayer; 2. Filter disc; 21. Installation pipe; 211. Gear; 22. Adjustment assembly; 221. Electric controller; 222. Valve; 3. Scraping mechanism; 31. Collection tank; 311. Scraper; 312. Diversion pipe; 32. Conveying mechanism. Detailed implementation manners

[0028] To further understand the features, technical means, specific purposes, and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0029] As Figures 1 to 7 shown: A waste liquid recovery device for the production of ultra-fine high-purity spherical silica powder includes a waste liquid tank 1 and a main shaft 11 horizontally arranged in the waste liquid tank 1. A negative pressure system 12 that can rotate with it is provided on the main shaft 11. A plurality of filter discs 2 are arranged on the main shaft 11 at equal intervals around it. All the filter discs 2 are connected to the negative pressure system 12. The filter discs 2 are installed on the main shaft 11 in an inclined posture. A specific angle can be formed between two adjacent filter discs 2. When the filter discs 2 rotate with the main shaft 11, the inclined surfaces of the filter discs 2 can form a cross-flow angle with the liquid material after being immersed in the waste liquid tank 1, and cooperate with the negative pressure system 12 to enable the filter discs 2 to adsorb silicon dioxide in the liquid material through their surfaces; An adjustment assembly 22 for adjusting the adsorption pressure of the filter discs 2 on silicon dioxide is provided between each filter disc 2 and the negative pressure system 12.

[0030] In the prior art, since multiple sector-shaped filter disks 2 form an integral disk-shaped structure, the filter disks 2 will immerse into the liquid material in the waste liquid tank 1 in a lateral manner, and the adsorption force of the negative pressure system 12 on the filter disks 2 cannot be adjusted. Once the filter disks 2 are immersed in the liquid material, silicon dioxide will quickly form an adsorption layer on their surfaces, resulting in uneven distribution of the adsorption layer. At the same time, when the filter disks 2 are separated from the liquid surface, due to the lack of pressure adjustment, the moisture in the adsorption layer is quickly dried out, causing the problem of premature shedding before reaching the designated collection area.

[0031] The device of the present invention installs multiple filter disks 2 on the main shaft 11 in an inclined manner and sets independent adjustment components 22 on each filter disk 2 to achieve phased and dynamic regulation of the adsorption force of the filter disks 2. Its working process can be divided into the following three stages: Initial stage When the main shaft 11 rotates, it will drive the rotation of the filter disks 2. Since the filter disks 2 are arranged in an inclined posture, when they are first immersed in the liquid material, the adjustment component 22 will control the adsorption force of the filter disks 2 at a relatively low level, so that the silicon powder particles are evenly deposited on the surfaces of the filter disks 2 at a slower rate, forming a thin and uniform initial adsorption layer. The inclined installation of the filter disks 2 will generate a weak tangential flow during the rotation process with the main shaft 11, effectively guiding the silicon powder particles to be arranged in a certain direction and reducing the risk of pore blockage caused by excessive local deposition. Second stage As the filter disks 2 further penetrate into the liquid material, the adjustment component 22 will gradually increase the adsorption force, thereby accelerating the interception efficiency of the silicon powder. At this time, the rotation speed of the filter disks 2 increases, so that the tangential flow velocity increases accordingly, moderately scouring the formed adsorption layer to prevent excessive local deposition, and at the same time allowing new silicon powder to continue to deposit, ensuring that the filtration efficiency always remains at a high level.

[0032] Third stage When the filter disks 2 are separated from the liquid material, the adjustment component 22 will further increase the adsorption force of the filter disks 2 to promote the formation of a dry silicon powder layer on the surfaces of the filter disks 2. Subsequently, before the filter disks 2 are immersed in the liquid material again, the dry silicon powder layer is gently scraped or automatically collected by a cleaning mechanism (not shown in the figure) to complete the recovery of the silicon powder, and then the filter disks 2 enter the next cycle. The low-pressure adsorption stage enables the silicon powder particles to be slowly deposited. Combined with the tangential flow guided by the inclination of the filter disks 2, a uniform and thin initial adsorption layer can be formed, effectively preventing local blockage caused by uneven deposition.

[0033] The adjustment component 22 realizes the dynamic regulation of the negative pressure of the filter disks 2 at different stages, enabling the device to automatically match the best adsorption force according to the position and working state of the filter disks 2, thus avoiding the entire system being in a high negative pressure state for a long time, reducing energy consumption and mechanical wear, and prolonging the service life of the device. Through the above method, the silicon powder can be stably and evenly separated and dried in each cycle, realizing the efficient and continuous recovery of the silicon powder in the waste liquid, further reducing the production cost and improving the resource utilization rate.

[0034] As shown Figures 1 to 6 in the figure: The filter disc 2 is rotatably arranged on the main shaft 11, and a scraping mechanism 3 for scraping and collecting the adsorption layer formed on the surface of the filter disc 2 is arranged at the top of the waste liquid tank 1; when the filter disc 2 rotates to the position of the scraping mechanism 3, it can adjust its posture to a state adapted to the scraping mechanism 3, so that the scraping mechanism 3 can clean the adsorption layer on the surface of the filter disc 2.

[0035] Since the filter disc 2 rotates into the liquid at an inclined angle on the main shaft 11 to achieve efficient adsorption and filtration. However, before the filter disc 2 is re-immersed in the liquid, the adsorption layer on its surface needs to be cleaned. But if the filter disc 2 always maintains an inclined posture, it is difficult for the scraping mechanism 3 to clean the inclined filter disc 2. Therefore, after the filter disc 2 completes filtration and gradually disengages from the liquid, by adjusting the angle of the filter disc 2, it is adjusted from an inclined state to a posture adapted to the scraping mechanism 3 so as to enter the scraping mechanism 3. The dry silica powder layer on the surface of the filter disc 2 is thoroughly removed by the scraping mechanism 3, and the collected silica powder is introduced into the storage or subsequent processing system. After the filter disc 2 is cleaned, the inclined angle is restored so that the filter disc 2 can enter the liquid again for circulation.

[0036] By adjusting the posture of the filter disc 2, the scraping mechanism 3 can act evenly on the surface of the filter disc 2, effectively avoiding incomplete cleaning of the inclined filter disc 2 due to angle problems and improving the silica powder recovery rate. The adjustable setting of the filter disc 2 ensures that the filter disc 2 maintains the best inclined angle during filtration and can restore the angle during cleaning, optimizing the entire filtration and cleaning process and improving the equipment stability.

[0037] As shown Figures 1 to 6 and Figure 8 and Figure 9 in the figure: An installation pipe 21 is arranged at the bottom of the filter disc 2. The installation pipe 21 is rotatably sleeved on the negative pressure system 12 and is hermetically connected to the negative pressure system 12. A gear 211 is fixedly connected to the outside of the installation pipe 21, and a rack 111 meshing with the gear 211 is arranged on the main shaft 11.

[0038] During the operation of the device, the filter disc 2 is connected to the negative pressure system 12 through the installation pipe 21 at the bottom to achieve a stable adsorption effect. The gear 211 outside the installation pipe 21 meshes with the rack 111 on the main shaft 11. Before the filter disc 2 is immersed in the liquid material, the movement of the rack 111 drives the meshing-connected gear 211 to rotate, and the rotation of the gear 211 drives the rotation of the installation pipe 21, thereby generating the tilting posture of the filter disc 2, and the filter disc 2 can form a uniform adsorption layer in the liquid material. As the filter disc 2 gradually disengages from the liquid material, when the filter disc 2 moves to the scraping mechanism 3, the rack 111 will move again, driving the gear 211, so that the filter disc 2 can rotate to match the scraping mechanism 3, facilitating the scraping mechanism 3 to recover the silicon powder on the surface of the filter disc 2, enabling the filter disc 2 to maintain precise control in different working stages, optimizing the processes of silicon powder adsorption, dehydration and scraping, and reducing the subsequent processing cost.

[0039] Through a stable transmission structure, the filter disc 2 rotates uniformly when entering the liquid material, ensuring that the adsorption layer is formed evenly, preventing local overthickness or blockage, and improving the quality of silicon powder recovery. Moreover, the gear 211 and rack 111 transmission mechanism is wear-resistant and not prone to loosening, reducing the maintenance requirements and extending the service life of the equipment.

[0040] As Figures 4 to 7 and Figure 10 shown: The rack 111 can slide along the axis direction of the main shaft 11. A limit block 1111 is provided at the end of the rack 111. An elastic member 1112 is provided between the limit block 1111 and the main shaft 11. An arc-shaped driving block 13 capable of driving the rack 111 to slide along the main shaft 11 is provided on the inner wall of the waste liquid tank 1.

[0041] During the operation of the device, the filter disc 2 rotates synchronously with the main shaft 11. The end of the rack 111 will always be close to the inner wall of the waste liquid tank 1 under the action of the elastic member 1112 and maintain sliding with the inner wall when the main shaft 11 rotates. When the end of the rack 111 contacts the arc-shaped driving block 13, the arc-shaped driving block 13 exerts a thrust on the rack 111, causing the rack 111 to slide axially along the main shaft 11, thereby driving the rotation of the gear 211. Through the rotation of the gear 211, the rotation of the installation pipe 21 is further driven, and through the rotation of the installation pipe 21, the angle or rotation state of the filter disc 2 is changed accordingly. After the rack 111 slides to the set position, the elastic member 1112 provides buffering and resets the rack 111 after the filter disc 2 leaves the arc-shaped driving block 13, ensuring that the filter disc 2 returns to the initial state and enters the next cycle.

[0042] Through the linkage between the arc-shaped driving block 13 and the rack 111, the automatic adjustment of the angle or rotation state of the filter disc 2 at different process stages is realized, which helps to optimize the processes of silicon powder adsorption, dehydration and scraping, and improve the overall recovery efficiency. The end of the rack 111 is always smoothly abutted against the inner wall of the waste liquid tank 1 under the action of the elastic member 1112, and the sliding impact is reduced through the buffering effect, the wear of the gear 211, the rack 111 and the filter disc 2 is reduced, and the service life of the equipment is prolonged. Using the arc-shaped driving block 13 as the driving force for the sliding of the rack 111, the automatic adjustment of the angle of the filter disc 2 can be realized without additional power input, the energy consumption is reduced, and the economic efficiency of the equipment operation is improved.

[0043] By precisely controlling the angle or rotation state of the filter disc 2, the silicon powder layer is in the best desorption state during the scraping stage, the cleaning efficiency of the scraping mechanism 3 is improved, the loss of silicon powder is reduced, and the continuous and stable operation is ensured.

[0044] As Figures 4 to 9 shown: The adjusting assembly 22 includes an electric controller 221 and a valve 222. The valve 222 is sleeved between the negative pressure system 12 and the installation pipe 21 of the filter disc 2. The opening degree of the valve 222 is controlled by the electric controller 221 to adjust the adsorption pressure of the filter disc 2 on silicon dioxide.

[0045] During the operation of the equipment, the negative pressure system 12 provides an adsorption force to the filter disc 2 through the installation pipe 21 to intercept silicon dioxide in the waste liquid. The adjusting assembly 22 precisely adjusts the opening degree of the valve 222 through the electric controller 221 to control the adsorption pressure of the negative pressure system 12 on the filter disc 2. When the filter disc 2 is first immersed in the liquid material, the electric controller 221 adjusts the opening degree of the valve 222 to a smaller value to keep the adsorption force at a lower level, ensuring that the silicon powder particles are evenly deposited to form a stable initial adsorption layer. As the filter disc 2 deepens into the liquid material, the electric controller 221 gradually increases the opening degree of the valve 222 to increase the adsorption pressure, enhance the interception effect of the silicon powder, and cooperate with the tangential flow to optimize the filtration efficiency. When the filter disc 2 is separated from the liquid material, the electric controller 221 adjusts the opening degree of the valve 222 to the maximum to increase the adsorption force to further remove the moisture in the adsorption layer, making it form a dry silicon powder layer, and finally the silicon powder is collected through the scraping mechanism 3.

[0046] Precisely adjust the opening degree of the valve 222 through the electric controller 221, so that the filter disc 2 has different adsorption pressures in different working stages, ensuring uniform deposition of silicon powder particles, reducing local blockage phenomena, and improving filtration stability. Gradually increase the adsorption force to keep the silicon powder at an appropriate deposition rate during the entire adsorption process, avoid forming an overly thick adsorption layer at once, and provide a higher adsorption force during the dehydration stage to improve the dryness of the silicon powder and reduce the energy consumption of subsequent processing. Avoid the lag of traditional mechanical adjustment methods, improve the response speed, ensure that the filter disc 2 is in the best adsorption state at different stages, achieve refined control, and improve production efficiency. Reduce the equipment maintenance cost, while improving the adjustment accuracy, making the adsorption process of the filter disc 2 more stable and reliable, and extending the service life of the overall equipment.

[0047] As Figure 4 shown: Multiple spray heads 14 for driving the flow of the liquid material are provided at the bottom of the waste liquid tank 1.

[0048] A pump (not shown in the figure) is provided at the bottom of the waste liquid tank 1. The pump can suck the liquid material and introduce it into the multiple spray heads 14 at the bottom of the waste liquid tank 1; The spray heads 14 are preferably arranged on both sides of the filter disc 2. Through the spray heads 14, the two sides of the filter disc 2 can be guided, promoting a better cross-flow effect of the liquid material on the surface of the filter disc 2, so as to enhance the adsorption effect of the filter disc 2 on silicon dioxide in the liquid material.

[0049] When the filter disc 2 rotates with the main shaft 11 and immerses into the liquid material in the waste liquid tank 1. At this time, the pump at the bottom of the waste liquid tank 1 starts, sucks the liquid material from the waste liquid tank 1, and transports it to each spray head 14 through a pipeline. The spray heads 14 spray the liquid material at a specific angle and direction to guide the two sides of the filter disc 2. Since the filter disc 2 is installed in an inclined posture, the sprayed liquid material forms a certain angle with the surface of the filter disc 2, thus forming a cross-flow on the surface of the filter disc 2. This cross-flow enables the liquid material to come into contact with the surface of the filter disc 2 more fully. On the one hand, it can timely take away the liquid material near the area on the surface of the filter disc 2 that has been saturated with adsorption, avoiding interference with the subsequent adsorption process; On the other hand, it can continuously bring new liquid material containing silicon dioxide to the surface of the filter disc 2, improving the adsorption efficiency of the filter disc 2 for silicon dioxide.

[0050] The cross-flow can make the liquid material flow uniformly on the surface of the filter disc 2, avoiding the accumulation or stagnation of the liquid material in local areas, enabling silicon dioxide to be adsorbed more uniformly on the surface of the filter disc 2, improving the quality and uniformity of the adsorption layer, and being beneficial to subsequent scraping and collection operations. It can also timely take away the impurities and particles that may accumulate on the surface of the filter disc 2, preventing their accumulation on the surface of the filter disc 2 and causing blockage. This helps to maintain the permeability of the filter disc 2, extend the service life of the filter disc 2, and reduce the maintenance frequency and cost of the equipment.

[0051] Due to the improvement of adsorption efficiency and uniformity, as well as the improvement of the clogging situation of the filter disc 2, the entire waste liquid recovery process is more stable and efficient, and can better realize the recovery of silicon dioxide in the waste liquid of ultrafine high-purity spherical silica powder production, improving the quality and purity of the recovered product.

[0052] As Figures 1 to 6 shown: The scraping mechanism 3 includes a collection tank 31 and two elastically deformable scraping plates 311 that are mirror-symmetrical. The bottom surface of the collection tank 31 is inclined, and the collection tank 31 is connected to an external driving mechanism. The external driving mechanism can create a negative pressure environment in the collection tank 31 to facilitate the collection of the dry silicon powder scraped from the surface of the filter disc 2.

[0053] When the filter disc 2 rotates to the scraping mechanism 3 and is adjusted to a proper posture, the two mirror-symmetrical elastic scraping plates 311 are in close contact with the surface of the filter disc 2. As the filter disc 2 rotates, the scraping plates 311 scrape off the adsorbed silicon dioxide layer on the surface of the filter disc 2. The scraped dry silicon powder will fall downward into the collection tank 31 due to the action of gravity and the scraping of the scraping plates 311. At this time, the external driving mechanism connected to the collection tank 31 starts to work, creating a negative pressure in the collection tank 31. Under the action of the negative pressure, the dry silicon powder is more smoothly sucked into the collection tank 31, and because the bottom surface of the collection tank 31 is inclined, the silicon powder will naturally slide along the inclined bottom surface and gather at a specific position in the collection tank 31, facilitating subsequent unified processing.

[0054] The negative pressure environment in the collection tank 31 can generate suction force, preventing the scraped silicon powder from flying and spreading in the air, and improving the collection rate of the silicon powder. At the same time, the inclined bottom surface is conducive to the natural aggregation and sliding of the silicon powder, avoiding the accumulation of silicon powder in the collection tank 31 and ensuring the smooth progress of the collection process. By collecting the silicon powder under negative pressure, the residue of the silicon powder in the surrounding environment of the equipment can be reduced, and the pollution risk of the silicon powder to other components of the equipment and the working environment can be lowered, which helps to keep the equipment clean and stable in operation. Using the external driving mechanism to form negative pressure for collection, the operation is relatively simple. Only by controlling the operation of the driving mechanism can the effective collection of the silicon powder be achieved, reducing the difficulty and workload of manual intervention.

[0055] As Figures 1 to 6 shown: A guide pipe is provided at the bottom of the collection tank 31, and a conveying mechanism 32 is provided beside the waste liquid tank 1. The diversion pipe 312 is connected to the conveying mechanism 32.

[0056] When the collection tank 31 of the scraping mechanism 3 collects the dry silicon powder scraped from the surface of the filter disc 2 under the action of negative pressure, the silicon powder slides down the bottom surface of the inclined collection tank 31 to the guide pipe at the bottom under the action of gravity. The guide pipe serves as a channel connecting the collection tank 31 and the conveying mechanism 32, and guides the silicon powder into the conveying mechanism 32. The conveying mechanism 32 is preferably a screw feeder, and the screw feeder can rotate under the drive of a motor through the spiral blade inside it. The rotating spiral blade will push the silicon powder forward along the pipe of the feeder, so as to transport the silicon powder to subsequent processing links, such as a storage device or further processing equipment.

[0057] The provision of the material guide pipe ensures that the silicon powder in the collecting tank 31 can be smoothly transferred from the collecting tank 31 to the conveying mechanism 32 , thereby preventing the silicon powder from accumulating at the bottom of the collecting tank 31 and ensuring the continuous and effective operation of the scraping mechanism 3 .

[0058] Screw feeders usually have good sealing properties, which can effectively prevent silicon powder from leaking into the surrounding environment during transportation, reducing the pollution of silicon powder to the working environment, while also avoiding the loss of silicon powder and improving the recovery rate of silicon powder.

[0059] The entire conveying system has a compact structure. The combination of the guide pipe and the screw feeder can be easily integrated into the entire waste liquid recovery equipment without taking up too much space, which is beneficial to the overall layout and installation of the equipment.

[0060] like Figures 1 to 5 The filter disc 2 is also provided with a sensor for detecting its position.

[0061] During the operation of the equipment, the filter disc 2 rotates with the main shaft 11 and undergoes multiple stages such as immersion, filtration, dehydration, and scraping. The sensor (not shown in the figure) is used to detect the position of the filter disc 2 at each stage in real time and feed back the data to the electric controller 221. The electric controller 221 dynamically adjusts the opening of the valve 222 according to the position information provided by the sensor, thereby accurately controlling the adsorption pressure of the filter disc 2. For example, when the filter disc 2 first enters the feed liquid, the sensor detects that the filter disc 2 has just entered the low-position area, and the electric controller 221 lowers the adsorption pressure accordingly; when the filter disc 2 goes deeper, the adsorption force gradually increases; when the filter disc 2 is separated from the feed liquid, the sensor detects that it is at the highest position, and the electric controller 221 increases the adsorption force to remove moisture and prepare for scraping. The sensor can also be used to monitor whether the filter disc 2 reaches the cleaning mechanism to ensure that the scraping mechanism 3 operates accurately and improves the cleaning efficiency.

[0062] To ensure the accuracy and stability of the position detection of the filter disc 2, the selection of sensors is crucial. It is preferably to adopt a combination of a magnetic encoder and an inductive proximity sensor to achieve high-precision detection and stable monitoring. Among them, the magnetic encoder is used to detect the rotation angle and position of the filter disc 2 to ensure that the motion state of the filter disc 2 is controllable at each stage; the inductive proximity sensor is used to detect whether the filter disc 2 reaches specific workstations, such as immersing in the liquid material and entering the scraping mechanism 3, etc., so as to improve the automation level of the equipment. In addition, a pressure sensor can be supplemented to monitor the adsorption force of the negative pressure system 12 in real time, optimize the adsorption pressure adjustment strategy, and improve the recovery efficiency of silicon powder. At the same time, for specific requirements, an ultrasonic sensor can be selected to detect the distance between the filter disc 2 and the liquid surface, or a temperature and humidity sensor can be used to monitor the drying degree of the silicon powder on the surface of the filter disc 2 to ensure the efficient operation of the scraping process. Through the collaborative work of multiple sensors, the equipment can achieve intelligent control, improve the recovery efficiency, extend the service life of the filter disc 2, and optimize the overall energy consumption management. Reduce manual intervention and improve production efficiency and stability.

[0063] As Figures 1 to 7 shown: There are a plurality of annular mounting brackets 112 arranged at equal intervals along the axis of the main shaft 11 for supporting the filter plate.

[0064] Through the setting of the annular mounting bracket 112, the weight of the filter disc 2 can be evenly dispersed, so that the filter disc 2 can maintain balance during rotation. Each annular mounting bracket 112 is tightly connected to the filter disc 2, providing a stable support for the filter disc 2 to prevent the filter disc 2 from shaking, shifting, etc. during rotation. In this way, the filter disc 2 can maintain a stable posture at each working stage, such as immersing in the liquid material, adsorbing silicon dioxide, and rotating to the scraping mechanism 3, etc., to ensure the smooth progress of the entire silicon powder recovery process.

[0065] The above embodiments only represent one or several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A waste liquid recovery device for producing ultrafine high-purity spherical silicon powder, comprising a waste liquid tank (1) and a main shaft (11) arranged horizontally in the waste liquid tank (1), the main shaft (11) being provided with a negative pressure system (12) capable of rotating therewith, the main shaft (11) being provided with a plurality of filter discs (2) arranged equidistantly around the main shaft (11), all the filter discs (2) being connected to the negative pressure system (12), characterized in that: The filter disc (2) is installed on the main shaft (11) in an inclined posture, and a specific angle can be formed between two adjacent filter discs (2). When the filter disc (2) rotates with the main shaft (11), the inclined surface of the filter disc (2) can form a cross-flow angle with the feed liquid after being immersed in the waste liquid tank (1), and the negative pressure system (12) is used to enable the filter disc (2) to adsorb silicon dioxide in the feed liquid through its surface; An adjustment component (22) for adjusting the adsorption pressure of the filter disc (2) on silicon dioxide is provided between each filter disc (2) and the negative pressure system (12).

2. The waste liquid recovery equipment for the production of ultrafine high-purity spherical silicon powder according to claim 1, characterized in that: The filter disc (2) is rotatably arranged on the main shaft (11), and a scraping mechanism (3) for scraping and collecting an adsorption layer formed on the surface of the filter disc (2) is arranged on the top of the waste liquid tank (1); when the filter disc (2) is rotated to the scraping mechanism (3), the posture of the filter disc (2) can be adjusted to a state compatible with the scraping mechanism (3), so that the scraping mechanism (3) can clean the adsorption layer on the surface of the filter disc (2).

3. The waste liquid recovery equipment for the production of ultrafine high-purity spherical silicon powder according to claim 2, characterized in that: A mounting tube (21) is provided at the bottom of the filter disc (2); the mounting tube (21) is rotatably sleeved on the negative pressure system (12) and maintains an airtight connection with the negative pressure system (12); a gear (211) is fixedly connected to the outside of the mounting tube (21); and a rack (111) meshingly connected to the gear (211) is provided on the main shaft (11).

4. The waste liquid recovery equipment for the production of ultrafine high-purity spherical silicon powder according to claim 3, characterized in that: The rack (111) can slide along the axial direction of the main shaft (11), a limit block (1111) is arranged at the end of the rack (111), an elastic member (1112) is arranged between the limit block (1111) and the main shaft (11), and an arc-shaped driving block (13) capable of driving the rack (111) to slide along the direction of the main shaft (11) is arranged on the inner wall of the waste liquid tank (1).

5. The waste liquid recovery equipment for the production of ultrafine high-purity spherical silicon powder according to claim 1, characterized in that: The regulating component (22) comprises an electric controller (221) and a valve (222); the valve (222) is sleeved between the negative pressure system (12) and the mounting pipe (21) of the filter disc (2); the opening of the valve (222) is controlled by the electric controller (221) to regulate the adsorption pressure of the filter disc (2) on silica.

6. The waste liquid recovery equipment for the production of ultrafine high-purity spherical silicon powder according to claim 1, characterized in that: A plurality of nozzles (14) for driving the flow of liquid are arranged at the bottom of the waste liquid tank (1).

7. The waste liquid recovery equipment for the production of ultrafine high-purity spherical silicon powder according to claim 2, characterized in that: The scraping mechanism (3) comprises a collecting trough (31) and two scrapers (311) which are mirror-symmetrical and elastic. The bottom surface of the collecting trough (31) is arranged at an inclination, and the collecting trough (31) is connected to an external driving mechanism. The external driving mechanism can form a negative pressure environment in the collecting trough (31) so as to facilitate the collection of the dry silicon powder scraped off the surface of the filter disc (2).

8. The waste liquid recovery equipment for the production of ultrafine high-purity spherical silicon powder according to claim 7, characterized in that: A material guide pipe is provided at the bottom of the collecting tank (31), a conveying mechanism (32) is provided on the side of the waste liquid tank (1), and the guide pipe (312) is connected to the conveying mechanism (32).

9. The waste liquid recovery equipment for the production of ultrafine high-purity spherical silicon powder according to claim 1, characterized in that: The filter disc (2) is also provided with a sensor for detecting its position.

10. The waste liquid recovery equipment for producing ultrafine high-purity spherical silicon powder according to claim 1, characterized in that: The main shaft (11) is provided with a plurality of annular mounting frames (112) which are equidistantly distributed along its axis and are used to support the filter plate.

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