Filter for treating iron phosphate wastewater and filtering method thereof

Abstract

This invention relates to the field of ferric phosphate technology and discloses a filter and its filtration method for treating ferric phosphate wastewater. The filter includes a filter box and a heater. A chemical injection port is connected to the left side of the top of the filter box, a feed pipe is connected to the middle of the top of the filter box, a guide pipe is connected to the top of the feed pipe, and a discharge pipe is connected to the bottom of the filter box. A mixing mechanism is provided on the left side of the filter box, including a rotating motor and a driven stirring rod. The feeding mechanism scrapes the precipitate on the top of the filter plate inwards, facilitating uniform dehydration and preventing the precipitate from directly solidifying in the gaps of the filter plate, thus avoiding blockage. Furthermore, the heater heats the scraped precipitate, and the water evaporates due to the properties of calcium sulfate (losing one molecule of water of crystallization at 128℃ and all water at 163℃), achieving coagulation and complete dehydration of the calcium sulfate.

Description

Technical Field

[0001] This invention relates to the field of ferric phosphate technology, specifically to a filter and filtration method for treating ferric phosphate wastewater. Background Technology

[0002] Lithium iron phosphate (LiFePO4) is currently the ideal cathode material for batteries. With the rapid development of the new energy market, the demand for power batteries, energy storage materials, and equipment is increasing, leading to a rapid increase in demand for LiFePO4. The production process of LiFePO4 involves processes such as generators and washing, resulting in high-salt inorganic wastewater containing varying concentrations of metal ions, sulfate ions, and ferric phosphate ions. This wastewater is difficult to treat, and its release can cause serious damage and harm to the surrounding environment.

[0003] In the treatment of ferric phosphate wastewater, filters are required to filtration the wastewater. The mainstream treatment method is lime precipitation. Phosphate and sulfate ions in the wastewater react with lime to form calcium phosphate and calcium sulfate precipitates. The precipitates are then filtered to treat the ferric phosphate wastewater. However, the calcium sulfate produced in the wastewater has a strong water absorption capacity. Therefore, during the precipitation and filtration process, it absorbs water and becomes a viscous slurry, which may clog the filter plates inside the filter. Furthermore, the viscous calcium sulfate has strong toughness after solidification, making it difficult for workers to remove it from the surface of the filter plates, thus affecting the filtration effect.

[0004] To address the aforementioned issues, we propose an improvement: a filter for treating ferric phosphate wastewater and its filtration method. Summary of the Invention

[0005] The purpose of this invention is to provide a filter and filtration method for treating ferric phosphate wastewater, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A filter for treating ferric phosphate wastewater includes a filter box and a heater. The left side of the top of the filter box is connected to a chemical injection port, the middle of the top of the filter box is connected to a feed pipe, the top of the feed pipe is connected to a guide pipe, and the bottom of the filter box is connected to a discharge pipe.

[0008] A mixing mechanism is provided on the left side of the filter box, which includes a rotating motor and a driven stirring rod. A pushing mechanism is provided on the right side of the filter box, which includes a servo motor, a threaded sleeve, a forward and reverse threaded rod, and a driven shaft. A baffle plate is provided in the inner cavity of the filter box, and discharge pipes are connected to the two sides of the bottom of the baffle plate. A solenoid valve is provided on the surface of the discharge pipe. Filter plates are provided on both sides of the heater, and the outer sides of the filter plates are welded to the inner wall of the filter box. Guide plates are welded to the left and right sides of the bottom of the inner cavity of the filter box.

[0009] As a further embodiment of the present invention: the output end of the servo motor is fixedly connected to the drive shaft, the driven shaft is movably connected to the right side of the filter box through a bearing, the positive and negative threaded rods are welded to the inner sides of the driven shaft and the drive shaft, the threaded sleeve is threadedly connected to the left and right sides of the positive and negative threaded rods, a connecting plate is welded to the bottom of the threaded sleeve, a scraper is provided at the bottom of the connecting plate, and the bottom of the scraper contacts the filter plate, the surfaces of the drive shaft and the driven shaft are respectively welded with a drive pulley and a driven pulley, and the drive pulley and the driven pulley are connected by a transmission belt.

[0010] As a further embodiment of the present invention: the output end of the rotating motor is fixedly connected to an active stirring rod, and the driven stirring rod is movably connected to the inner cavity of the filter box through a bearing. The surfaces of the active stirring rod and the driven stirring rod are provided with multiple stirring blades.

[0011] As a further embodiment of the present invention: the bottom of the baffle plate is provided with sliding grooves on both the left and right sides, and the top of the threaded sleeve is welded with a sliding rod, which is slidably connected in the sliding groove.

[0012] As a further embodiment of the present invention: limiting blocks are welded on both the left and right sides of the surface of the positive and negative threaded rod, and the diameter of the limiting blocks is larger than the diameter of the threaded sleeve.

[0013] As a further embodiment of the present invention: a driven gear is welded to the outer side of the driven stirring rod, and a driving gear is welded to the outer side of the active stirring rod, and the active gear and the driven gear mesh with each other through teeth.

[0014] As a further embodiment of the present invention: a heating tube is provided in the inner cavity of the guide plate, and a heating wire is wound around the surface of the heating tube.

[0015] As a further embodiment of the present invention: support legs are welded to all four sides of the bottom of the filter box, and anti-slip pads are provided on the bottom of the support legs.

[0016] As a further embodiment of the present invention: both the rotary motor and the servo motor are provided with brackets at their bottoms, and a support rod is welded to the bottom of the bracket, with one end of the support rod welded to the outside of the filter box.

[0017] A filtration method for a filter used in the treatment of ferric phosphate wastewater, comprising the following steps:

[0018] S1: Mixing Reaction: First, the alkaline solution and flocculant are added into the inner cavity of the filter box through the injection port. Then, the ferric phosphate wastewater comes into contact with the alkaline solution and flocculant and mixes. At this time, the active stirring rod is driven by the rotating motor to rotate. The active stirring rod synchronously drives the active gear to rotate. The active gear drives the driven gear to rotate through the meshing of the teeth. The driven gear drives the driven stirring rod to rotate in the opposite direction. The driven stirring rod and the active stirring rod synchronously drive the stirring blades to rotate, stirring and mixing the ferric phosphate wastewater with the alkaline solution and flocculant, accelerating its reaction rate, and allowing the wastewater to be initially filtered.

[0019] S2: Heated Feeding: The wastewater after the initial reaction by the mixing mechanism contains sediment. At this time, the wastewater and sediment fall together through the discharge pipe to the top of the filter plate for filtration. The sediment is filtered to the top of the filter plate. Then, the output of the servo motor drives the drive shaft to rotate. The drive shaft drives the drive pulley to rotate. The drive pulley drives the driven pulley to rotate through the transmission belt. The driven pulley drives the driven shaft to rotate. The driven shaft and the drive shaft drive the positive and negative threaded rods to rotate. The positive and negative threaded rods drive the threaded sleeve to move inward through the thread action. The threaded sleeve drives the connecting plate and scraper to move inward, scraping the sediment in the wastewater to the surface of the heater. The heater heats the sediment accumulated on its surface. Due to the characteristics of calcium sulfate (losing 1 molecule of water of crystallization at 128℃ and losing all water at 163℃), the water evaporates. After the sediment has completely solidified, the staff removes the sediment by opening the material removal door.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. The present invention, through the setting of the feeding mechanism, can scrape the precipitate on the top of the filter plate inward, which facilitates uniform dehydration and avoids the precipitate from directly solidifying in the gaps of the filter plate and causing blockage. Furthermore, the scraped precipitate is heated by a heater, and the water is evaporated by the characteristics of calcium sulfate (it loses 1 molecule of water of crystallization at 128°C and loses all water at 163°C), thus realizing the solidification of calcium sulfate and complete dehydration.

[0022] 2. The present invention, through the setting of the mixing mechanism, can mix wastewater, alkaline solution and flocculant evenly. The driven gear and driven gear drive the driven stirring rod to rotate in the opposite direction to the active stirring rod, so as to generate a large centrifugal force, so as to mix it evenly, accelerate the reaction rate and improve the filtration effect.

[0023] 3. This invention, by setting a sliding groove and a sliding rod, can limit the threaded sleeve, improving its stability during movement and preventing it from deviating. By setting a limiting block, the threaded sleeve can be limited to prevent it from moving too far, thus affecting the movement position of the scraper. By setting a driving gear and a driven gear, the driven stirring rod is driven to rotate in the opposite direction to the driving stirring rod, generating a large centrifugal force to ensure uniform mixing and accelerate the reaction rate. By setting a heating tube and a heating wire, the filtered wastewater can be heated and sterilized during the discharge process, further improving the filtration effect. By setting a support leg and an anti-slip pad, it can play a role in preventing slippage and improving the stability of the overall device when placed. By setting a bracket and a support rod, it can support the rotating motor and the servo motor to prevent them from falling. Attached Figure Description

[0024] Figure 1 A schematic diagram of a filter for treating ferric phosphate wastewater and its filtration method;

[0025] Figure 2 This is a right-view structural schematic diagram of a filter and filtration method for treating ferric phosphate wastewater.

[0026] Figure 3 A cross-sectional structural diagram of a filter and filtration method for treating ferric phosphate wastewater;

[0027] Figure 4 A bottom-view cross-sectional diagram of a filter and filtration method for treating iron phosphate wastewater;

[0028] Figure 5 A schematic diagram of the feeding mechanism in a filter and filtration method for treating ferric phosphate wastewater;

[0029] Figure 6 A schematic diagram of the mixing mechanism in a filter and filtration method for treating ferric phosphate wastewater;

[0030] Figure 7 This is a schematic diagram of the cross-sectional structure of the guide plate in a filter for treating iron phosphate wastewater and its filtration method.

[0031] In the diagram: 1. Filter box; 2. Support rod; 3. Bracket; 4. Mixing mechanism; 401. Rotary motor; 402. Drive gear; 403. Driven stirring rod; 404. Stirring blade; 405. Driven stirring rod; 406. Driven gear; 5. Injection port; 6. Guide pipe; 7. Feed pipe; 8. Support leg; 9. Discharge pipe; 10. Anti-slip mat; 11. Pushing mechanism; 1101. Servo motor; 1102. Drive belt 1103. Wheel; 1104. Drive shaft; 1105. Threaded sleeve; 1106. Scraper; 1107. Connecting plate; 1108. Threaded rod (positive and negative); 1109. Limiting block; 1100. Sliding rod; 1110. Driven shaft; 1111. Driven pulley; 12. Discharge pipe; 13. Baffle plate; 14. Solenoid valve; 15. Guide plate; 16. Heater; 17. Filter plate; 18. Slide groove; 19. Heating tube; 20. Heating wire. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] Please see Figure 1 , 2 3, 4, 5, and 6, a filter for treating ferric phosphate wastewater, comprising a filter box 1 and a heater 16, a chemical injection port 5 connected to the left side of the top of the filter box 1, a feed pipe 7 connected to the middle of the top of the filter box 1, a guide pipe 6 connected to the top of the feed pipe 7, a discharge pipe 9 connected to the bottom of the filter box 1, a mixing mechanism 4 provided on the left side of the filter box 1, the mixing mechanism 4 including a rotary motor 401 and a driven stirring rod 405, and a pushing mechanism 11 provided on the right side of the filter box 1. The feeding mechanism 11 includes a servo motor 1101, a threaded sleeve 1104, a forward and reverse threaded rod 1107, and a driven shaft 1110. The inner cavity of the filter box 1 is provided with a baffle plate 13. The two sides of the bottom of the baffle plate 13 are connected to the discharge pipe 12. The surface of the discharge pipe 12 is provided with a solenoid valve 14. The two sides of the heater 16 are provided with filter plates 17, and the outer side of the filter plates 17 is welded to the inner wall of the filter box 1. The left and right sides of the bottom of the inner cavity of the filter box 1 are welded with guide plates 15.

[0035] The output end of the servo motor 1101 is fixedly connected to the drive shaft 1103, and the driven shaft 1110 is movably connected to the right side of the filter box 1 through a bearing. The positive and negative threaded rods 1107 are welded to the inner side of the driven shaft 1110 and the drive shaft 1103. The threaded sleeve 1104 is threadedly connected to the left and right sides of the positive and negative threaded rods 1107. The bottom of the threaded sleeve 1104 is welded to the connecting plate 1106. The bottom of the connecting plate 1106 is provided with a scraper 1105, and the bottom of the scraper 1105 contacts the filter plate 17. The surfaces of the drive shaft 1103 and the driven shaft 1110 are respectively welded to the drive pulley 1102 and the driven pulley 1111, and the drive pulley 1102 and the driven pulley 1111 are connected by a transmission belt.

[0036] The bottom of the baffle plate 13 has grooves 18 on both the left and right sides. The top of the threaded sleeve 1104 is welded with a sliding rod 1109, which is slidably connected in the groove 18. Through the above technical solution, by setting the groove 18 and the sliding rod 1109, the threaded sleeve 1104 can be limited, improving its stability during movement and preventing it from deviating. The left and right sides of the surface of the positive and negative threaded rod 1107 are welded with limit blocks 1108, and the diameter of the limit blocks 1108 is larger than the diameter of the threaded sleeve 1104. Through the above technical solution, by setting the limit blocks 1108, the threaded sleeve 1104 can be limited, preventing it from moving too far and thus affecting the movement position of the scraper 1105.

[0037] The specific implementation of the present invention is as follows: by setting the feeding mechanism 11, the precipitate on the top of the filter plate 17 can be scraped inward, which facilitates uniform dehydration and avoids the precipitate from directly solidifying in the gaps of the filter plate 17, which would cause blockage. Furthermore, the scraped precipitate is heated by the heater 16, and the water is evaporated by the characteristics of calcium sulfate (it loses 1 molecule of water of crystallization at 128°C and loses all water at 163°C), thereby achieving the solidification and complete dehydration of calcium sulfate.

[0038] Example 2

[0039] Please see Figure 1-7A filter for treating ferric phosphate wastewater includes a filter box 1 and a heater 16. A chemical injection port 5 is connected to the left side of the top of the filter box 1. A feed pipe 7 is connected to the middle of the top of the filter box 1. A guide pipe 6 is connected to the top of the feed pipe 7. A discharge pipe 9 is connected to the bottom of the filter box 1. A mixing mechanism 4 is provided on the left side of the filter box 1. The mixing mechanism 4 includes a rotating motor 401 and a driven stirring rod 405. A pushing mechanism 11 is provided on the right side of the filter box 1. The pushing mechanism 11 includes a servo motor 1101, a threaded sleeve 1104, a forward and reverse threaded rod 1107, and a driven shaft 1110. A baffle plate 13 is provided in the inner cavity of the filter box 1. Discharge pipes 12 are connected to both sides of the bottom of the baffle plate 13. A solenoid valve 14 is provided on the surface of the discharge pipe 12. Filter plates 17 are provided on both sides of the heater 16, and the outer sides of the filter plates 17 are welded to the inner wall of the filter box 1. Guide plates 15 are welded to both the left and right sides of the bottom of the inner cavity of the filter box 1.

[0040] The output end of the rotating motor 401 is fixedly connected to the active stirring rod 403, and the driven stirring rod 405 is movably connected to the inner cavity of the filter box 1 through the bearing. Multiple stirring blades 404 are provided on the surface of the active stirring rod 403 and the driven stirring rod 405. Through the above technical solution, the wastewater, alkaline solution and flocculant can be mixed evenly by the mixing mechanism 4. The driven stirring rod 405 and the active stirring rod 403 are driven to rotate in opposite directions by the drive gear 402 and the driven gear 406 to generate a large centrifugal force, so as to mix them evenly, accelerate the reaction rate and improve the filtration effect.

[0041] The output end of the rotating motor 401 is fixedly connected to the active stirring rod 403, and the driven stirring rod 405 is movably connected to the inner cavity of the filter box 1 through the bearing. The surfaces of the active stirring rod 403 and the driven stirring rod 405 are provided with multiple stirring blades 404. Through the above technical solution, by setting the active gear 402 and the driven gear 406, the driven stirring rod 405 and the active stirring rod 403 are driven to rotate in opposite directions to generate a large centrifugal force, so as to mix them evenly and accelerate their reaction rate.

[0042] The working principle of this invention is as follows: First, alkaline solution and flocculant are added into the inner cavity of filter box 1 through injection port 5. Then, ferric phosphate wastewater comes into contact with alkaline solution and flocculant and mixes. At this time, the active stirring rod 403 is driven to rotate by rotating motor 401. The active stirring rod 403 synchronously drives the active gear 402 to rotate. The active gear 402 drives the driven gear 406 to rotate through tooth meshing. The driven gear 406 drives the driven stirring rod 405 to rotate in the opposite direction. The driven stirring rod 405 and the active stirring rod 403 synchronously drive the stirring blade 404 to rotate, stirring and mixing the ferric phosphate wastewater with alkaline solution and flocculant, accelerating its reaction rate, and allowing the wastewater to be initially filtered. The wastewater after the initial reaction by mixing mechanism 4 will contain precipitates. At this time, the wastewater and precipitates fall together through discharge pipe 12 to the top of filter plate 17 for filtration. The precipitates are filtered to the top of filter plate 17. Subsequently, the output of the servo motor 1101 drives the drive shaft 1103 to rotate, the drive shaft 1103 drives the drive pulley 1102 to rotate, the drive pulley 1102 drives the driven pulley 1111 to rotate through the transmission belt, the driven pulley 1111 drives the driven shaft 1110 to rotate, the driven shaft 1110 and the drive shaft 1103 drive the positive and negative threaded rod 1107 to rotate, the positive and negative threaded rod 1107 drives the threaded sleeve 1104 to move inward through the thread action, the threaded sleeve 1104 drives the connecting plate 1106 and the scraper 1105 to move inward, scraping the sediment in the wastewater onto the surface of the heater 16, the heater 16 heats the sediment on its surface, and the water evaporates through the characteristics of calcium sulfate (losing 1 molecule of crystal water at 128℃, losing all water at 163℃), after the sediment has completely solidified, the workers remove the sediment by opening the material removal door.

[0043] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A filter for treating ferric phosphate wastewater, comprising a filter box (1) and a heater (16), characterized in that: The filter box (1) has a drug injection port (5) on the left side of the top, a feed pipe (7) on the middle of the top of the filter box (1), a guide pipe (6) on the top of the feed pipe (7), and a discharge pipe (9) on the bottom of the filter box (1). A mixing mechanism (4) is provided on the left side of the filter box (1). The mixing mechanism (4) includes a rotating motor (401) and a driven stirring rod (405). A pushing mechanism (11) is provided on the right side of the filter box (1). The pushing mechanism (11) includes a servo motor (1101), a threaded sleeve (1104), a positive and negative threaded rod (1107), and a driven shaft (1110). A baffle plate (13) is provided in the inner cavity of the filter box (1). A discharge pipe (12) is connected to both sides of the bottom of the baffle plate (13). A solenoid valve (14) is provided on the surface of the discharge pipe (12). Filter plates (17) are provided on both sides of the heater (16). The outer side of the filter plates (17) is welded to the inner wall of the filter box (1). Guide plates (15) are welded to both sides of the bottom of the inner cavity of the filter box (1). The output end of the servo motor (1101) is fixedly connected to the drive shaft (1103). The driven shaft (1110) is movably connected to the right side of the filter box (1) through a bearing. The positive and negative threaded rod (1107) is welded to the inner side of the driven shaft (1110) and the drive shaft (1103). The threaded sleeve (1104) is threaded to the left and right sides of the positive and negative threaded rod (1107). The bottom of the threaded sleeve (1104) is welded to a connecting plate (1106). The bottom of the connecting plate (1106) is provided with a scraper (1105), and the bottom of the scraper (1105) is in contact with the filter plate (17). The surfaces of the drive shaft (1103) and the driven shaft (1110) are respectively welded with a drive pulley (1102) and a driven pulley (1111), and the drive pulley (1102) and the driven pulley (1111) are connected by a transmission belt. The output end of the rotary motor (401) is fixedly connected to the active stirring rod (403), and the driven stirring rod (405) is movably connected to the inner cavity of the filter box (1) through the bearing. The surfaces of the active stirring rod (403) and the driven stirring rod (405) are provided with multiple stirring blades (404). The bottom of the baffle plate (13) is provided with sliding grooves (18) on both the left and right sides. The top of the threaded sleeve (1104) is welded with a sliding rod (1109), and the sliding rod (1109) is slidably connected in the sliding groove (18). Limiting blocks (1108) are welded to both the left and right sides of the surface of the positive and negative threaded rod (1107), and the diameter of the limiting block (1108) is larger than the diameter of the threaded sleeve (1104).

2. The filter for treating ferric phosphate wastewater according to claim 1, characterized in that: A driven gear (406) is welded to the outside of the driven stirring rod (405), and a driving gear (402) is welded to the outside of the driving stirring rod (403), and the driving gear (402) and the driven gear (406) mesh with each other.

3. A filter for treating ferric phosphate wastewater according to claim 1, characterized in that: The inner cavity of the guide plate (15) is provided with a heating tube (19), and the surface of the heating tube (19) is wound with a heating wire (20).

4. A filter for treating ferric phosphate wastewater according to claim 1, characterized in that: The bottom of the filter box (1) is welded with support legs (8) around its perimeter, and the bottom of the support legs (8) is provided with anti-slip pads (10).

5. A filter for treating ferric phosphate wastewater according to claim 1, characterized in that: Both the rotary motor (401) and the servo motor (1101) are provided with brackets (3) at their bottoms. A support rod (2) is welded to the bottom of the bracket (3), and one end of the support rod (2) is welded to the outside of the filter box (1).

6. A filtration method for a filter used in the treatment of ferric phosphate wastewater, comprising using the filter for treating ferric phosphate wastewater as described in any one of claims 1 to 5, characterized in that: Its filtering method includes the following steps: S1: Mixing reaction: First, the alkaline solution and flocculant are added into the inner cavity of the filter box (1) through the injection port (5). Then, the ferric phosphate wastewater is mixed with the alkaline solution and flocculant. At this time, the active stirring rod (403) is driven to rotate by the rotating motor (401). The active stirring rod (403) drives the active gear (402) to rotate synchronously. The active gear (402) drives the driven gear (406) to rotate through the meshing of teeth. The driven gear (406) drives the driven stirring rod (405) to rotate in the opposite direction. The driven stirring rod (405) and the active stirring rod (403) drive the stirring blade (404) to rotate synchronously. The ferric phosphate wastewater is stirred and mixed with the alkaline solution and flocculant to accelerate its reaction rate and make the wastewater initially filtered. S2: Heating and feeding: The wastewater after the initial reaction by the mixing mechanism (4) will contain sediment. At this time, the wastewater and sediment fall together through the discharge pipe (12) to the top of the filter plate (17) for filtration. The sediment is filtered to the top of the filter plate (17). Then, the output end of the servo motor (1101) drives the drive shaft (1103) to rotate. The drive shaft (1103) drives the drive pulley (1102) to rotate. The drive pulley (1102) drives the driven pulley (1111) to rotate through the transmission belt. The driven pulley (1111) drives the driven shaft (1102) to rotate. 110) Rotate, driven shaft (1110) and drive shaft (1103) drive the positive and negative threaded rod (1107) to rotate. The positive and negative threaded rod (1107) drives the threaded sleeve (1104) to move inward through the thread action. The threaded sleeve (1104) drives the connecting plate (1106) and scraper (1105) to move inward, scraping the sediment in the wastewater onto the surface of the heater (16). The heater (16) heats the sediment accumulated on its surface, and the water evaporates through the properties of calcium sulfate. After the sediment is completely solidified, the staff removes the sediment by opening the material removal door.

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