Water treatment device for preparing low-iron low-salt heavy soda ash and treatment process thereof

Abstract

The invention relates to the technical field of alkali production wastewater treatment, and discloses a water treatment device for preparing low-iron low-salt heavy soda ash and a treatment process thereof.The water treatment device comprises a treatment box and an aeration tank arranged at the upper end of the treatment box and communicated with the treatment box, and at least three main filter plates are obliquely arranged at the upper end of the inner side of the treatment box; filter cloth is arranged at the top of the main filter plate, one end of the main filter plate is rotatably connected with the inner wall of the treatment box, and the other end abuts against the inner wall of the treatment box; the backwashing mechanism is arranged on the inner side of the treatment box and comprises a guide groove which is formed in the edge of the bottom of the main filter plate and is parallel to the main filter plate. According to the water treatment device for preparing the low-iron and low-salt heavy soda ash, the main filter plate is obliquely and rotatably arranged in the treatment box, the inclination angle of the main filter plate can be increased while backwashing cleaning is performed in cooperation with the backwashing mechanism, impurities are used for flushing down, one end of the main filter plate is separated from the inner wall of the treatment box, and the impurities are conveniently discharged and collected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of caustic soda wastewater treatment, and particularly relates to a water treatment device for preparing low-iron low-salt heavy-duty caustic soda and a treatment process thereof. BACKGROUND

[0002] The preparation of low-iron low-salt heavy-duty caustic soda has strict requirements on raw material water quality and process cleanliness, because trace iron ions can cause product coloring, and salt accumulation can affect the crystallization purity and density; the wastewater produced in the production process contains dissolved ferrous iron, calcium and magnesium precipitates and microcrystals, and if it is directly discharged or reused, it will pollute the environment and destroy the salt balance, so the impurities need to be controlled through a wastewater pretreatment system; among them, aeration oxidation is the core link, and through forced air, the ferrous iron is converted into insoluble flocs; then solid-liquid separation needs to intercept solid impurities step by step, to provide low-suspended solids and low-iron feed water conditions for subsequent reverse osmosis desalination or evaporation crystallization, and to ensure the purity of the final product. However, the existing solid-liquid separation pretreatment device has certain defects: the multi-stage filtration unit usually adopts a fixed filter plate structure, and the filter cake (containing 、 and microcrystals) intercepted on the surface of the filter cloth needs to be cleaned regularly to restore the flux, although backwashing is the mainstream cleaning method, but because the filter plate is fixed and cannot be moved, the flushing water flow cannot completely strip the caked impurities, resulting in high filter cake residual rate and the need for frequent shutdown for manual removal; in addition, the backwashing flow and the filter cake discharge path are not designed in coordination, and the impurities accumulate at the bottom of the equipment and cannot be efficiently collected, causing the risk of secondary blockage. SUMMARY

[0003] The technical problem to be solved by the present application is that the existing technology has the shortcomings of low cleaning efficiency of the filter structure and difficulty in discharging and collecting impurities, and therefore the present application provides a water treatment device for preparing low-iron low-salt heavy-duty caustic soda and a treatment process thereof.

[0004] To achieve the above purpose, the present application adopts the following technical scheme: a water treatment device for preparing low-iron low-salt heavy-duty caustic soda and a treatment process thereof, comprising: a water treatment device for preparing low-iron low-salt heavy-duty caustic soda, comprising a treatment box and an aeration tank arranged on the upper end of the treatment box and communicating with the treatment box, at least three main filter plates are arranged on the upper end of the inner side of the treatment box and inclined, a filter cloth is arranged on the top of the main filter plate, one end of the main filter plate is rotationally connected with the inner wall of the treatment box, and the other end is in abutment with the inner wall of the treatment box; It also includes a backwashing mechanism located inside the treatment tank. The backwashing mechanism includes a guide groove located at the bottom edge of the main filter plate and parallel to the main filter plate. The two ends of the inner side of the treatment tank are laterally movably connected to traction rods corresponding to the edges of the main filter plate. The side wall of the traction rod is provided with a guide pin that moves and guides the guide groove. The traction rod is a hollow structure. The side of the traction rod is connected to a backwashing pipe that corresponds to the main filter plate and is located at the bottom of the main filter plate. The upper end of the backwashing pipe is provided with a water spray nozzle. One end of the traction rod is connected to a water supply hose that extends to the outside of the treatment tank. The side of the treatment tank is provided with a drive source for driving the displacement of the traction rod.

[0005] Preferably, the traction rod is provided with an adjustment assembly on its side. The adjustment assembly includes a horizontal pipe connected to the side of the traction rod and corresponding to the backwash pipe. The backwash pipe is movably and sealed to the outside of the horizontal pipe. The upper end of the horizontal pipe is provided with a water outlet corresponding to the water spray nozzle. A traction arm is provided on the side wall of the end of the backwash pipe. A roller is rotatably provided at one end of the traction arm. Drive plates corresponding to the traction arm are respectively provided on opposite sides of the inner cavity of the treatment box. Arc-shaped protrusions are evenly provided on the side of the drive plates. Arc-shaped grooves are provided between adjacent arc-shaped protrusions. The arc-shaped protrusion on one drive plate corresponds to the arc-shaped groove on the other drive plate. The roller is used to roll and cooperate with the arc-shaped protrusions and the arc-shaped grooves.

[0006] Preferably, the length of the horizontal tube is greater than the length of the backwash tube, and elastic elements are provided on the outside of both ends of the horizontal tube.

[0007] Preferably, the top two sides of the main filter plate are provided with a first enclosure.

[0008] Preferably, a waste removal assembly is provided at the lower inner end of the processing box. The waste removal assembly includes a waste removal port located on one side of the lower end of the processing box. A secondary filter plate corresponding to the waste removal port is rotatably provided on the lower end of the processing box cavity near the waste removal port. A movable plate is movably sleeved on the side of the secondary filter plate facing away from the waste removal port. The upper end of the movable plate is rotatably connected to the bottom of the traction rod.

[0009] Preferably, the edge of the secondary filter plate is provided with a second enclosure in the shape of a "U".

[0010] Preferably, a sealing assembly is provided between the secondary filter plate and the inner wall of the treatment box. The sealing assembly includes a second sealing strip embedded in the edge of the secondary filter plate. A groove is provided on the inner side of the treatment box corresponding to the edge of the discharge port. A first sealing strip is fixedly provided at one end of the groove. A frame is movably provided on the inner side of the groove near the first sealing strip. The side of the frame near the first sealing strip is arc-shaped. Hydraulic oil is filled between the side of the frame facing away from the first sealing strip and the inner wall of the groove. A pressure plate extending to the inner side of the discharge port is vertically and movably connected to the bottom of the inner side of the discharge port. The upper end of the pressure plate is used to abut against the bottom of the second enclosure.

[0011] Preferably, the side wall of the traction rod is provided with a second guide rod corresponding to the traction arm, and the traction arm is movably sleeved with the second guide rod.

[0012] Preferably, a ceramic filter disc is provided on the lower inner side of the processing box.

[0013] This application also includes an embodiment, specifically a water treatment process for preparing low-iron, low-salt heavy soda ash, comprising the following steps: S1: Wastewater is introduced into the aeration tank, and air is forcibly introduced into the wastewater in the aeration tank; S2: After aeration, the wastewater in the aeration tank is slowly released into the treatment tank, and the wastewater is filtered step by step through at least three main filter plates. S3: Wastewater that has been filtered by multiple main filter plates falls and is then finely filtered by ceramic filter discs before being discharged to the next stage; S4: When the main filter plate needs to be cleaned after a period of use, the backwashing mechanism drives the main filter plate to tilt while flushing water from the bottom. One end of the main filter plate separates from the inner wall of the treatment tank, the tilt angle increases, and solid impurities are discharged.

[0014] The technical effects and advantages of this invention are as follows: In this invention, the main filter plate is tilted and rotated within the treatment chamber. Combined with the backwashing mechanism, the tilt angle of the main filter plate can be increased during backwashing, not only flushing away impurities but also separating one end of the main filter plate from the inner wall of the treatment chamber for easier collection. The adjustable components allow for the reciprocating movement of the backwash pipe, changing the flushing position of the spray nozzles and improving the flushing range and effect, ensuring thorough flushing. Furthermore, the gradual misalignment and alignment of the water outlet and spray nozzles allows for continuous adjustment of the spray nozzle inner diameter, thereby continuously adjusting the flow rate and achieving pulse-type flushing for better flushing results. The automatic adjustment of position and flow rate based on the displacement of the backwash pipe results in a compact structure and increased practicality.

[0015] In this invention, the impurity discharge component is linked with the traction rod. During rinsing, the movable plate tilts the secondary filter plate, allowing wastewater to filter and leak down, while solid impurities are filtered by the secondary filter plate. After rinsing, the secondary filter plate returns to its vertical position, facilitating the discharge and cleaning of impurities. Simultaneously, in conjunction with the sealing component, the discharge port can be sealed when the secondary filter plate covers it, preventing wastewater leakage. The structure is highly interconnected, achieving a one-step solution and is easy to use. Attached Figure Description

[0016] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a structural schematic diagram from another perspective of the present invention; Figure 3 This is a schematic diagram of the internal structure of the processing box of the present invention; Figure 4 This is a schematic diagram of the structure of the traction rod and the main filter plate of the present invention in a disassembled state; Figure 5 This is a structural schematic diagram of the present invention from the bottom view when the traction rod and the main filter plate are in contact. Figure 6 This is a schematic diagram of the drive board structure of the present invention; Figure 7 This is a schematic diagram of the backwash pipe and horizontal pipe of the present invention in their disassembled state; Figure 8 This is a structural diagram of the movable plate, auxiliary filter plate, and impurity discharge port of the present invention in a disassembled state; Figure 9 This is a schematic diagram of the sub-filter plate and movable plate of the present invention in an inclined and extended state; Figure 10 This is a cross-sectional structural diagram of the discharge port of the present invention.

[0017] Legend: 1. Aeration tank; 2. Treatment box; 3. Drive source; 4. Drain outlet; 5. Impurity outlet; 6. Second enclosure; 7. Secondary filter plate; 8. Ceramic filter disc; 9. Water supply hose; 10. Main filter plate; 11. Traction rod; 12. Movable plate; 13. Drive plate; 14. First guide rod; 15. Connecting plate; 16. Backwash pipe; 17. First enclosure; 18. Guide groove; 19. Traction arm; 20. Spray nozzle; 21. Guide pin; 22. Second guide rod; 23. Roller; 24. Elastic element; 25. Horizontal pipe; 26. Water outlet; 27. First sealing strip; 28. Pressure plate; 29. ​​Second sealing strip; 30. Frame; 31. Groove. Detailed Implementation

[0018] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0019] Reference Figures 1-3As shown, a water treatment device for preparing low-iron, low-salt heavy soda ash includes a treatment tank 2 and an aeration tank 1 located at the top of the treatment tank 2. The core function of the aeration tank 1 is to force air into the wastewater through a conventional perforated pipe aeration system, oxidizing dissolved ferrous ions into insoluble ferric flocs, while simultaneously promoting the flocculation and sedimentation of some suspended solids. Iron sludge is initially separated using an inclined plate settling zone, controlling the iron content of the product from the source. The aeration tank 1 is a conventional technical method, and its specific construction principle will not be elaborated upon in this application. A discharge port 4 is provided at the bottom of the aeration tank 1, with a valve installed on the discharge port 4. The lower end of the discharge port 4 extends to the upper inner side of the treatment tank 2 and corresponds to the main filter plate 10. An inlet is provided at the top of the aeration tank 1, and a drain outlet is provided on one side of the lower end of the treatment tank 2, with a control valve installed on the drain outlet. At least three main filter plates 10 are inclinedly arranged at the upper inner side of the treatment tank 2, with filter cloth on the top of each main filter plate 10. The first-stage main filter plate... The filter cloth on the first stage 10 is a single-layer polyester woven cloth used to intercept coarse particles. The filter cloth on the second-stage main filter plate 10 is a polyester base cloth and a monofilament surface layer used to capture medium-sized flocs. The filter cloth on the third-stage main filter plate 10 is a double-layer monofilament polypropylene filter cloth used to finely intercept microcrystals. The higher end of the main filter plate 10 is rotatably connected to the inner wall of the treatment box 2, preferably by hinge, or other rotatable connection methods can be used instead. The other end abuts against the inner wall of the treatment box 2, and this end is an arc-shaped surface, making line contact with the inner wall of the treatment box 2. For further filtration, a ceramic filter disc 8 is provided at the lower inner side of the treatment box 2. The ceramic filter disc 8 serves as the final fine filtration unit in the pretreatment. Its core function is to deeply intercept microcrystals and colloidal iron that have penetrated the three-stage filtration through the porous cordierite ceramic filter element under vacuum suction. It adopts a honeycomb through-hole structure, which has strong resistance to alkali corrosion. Vacuum suction is achieved by equipping the bottom of the treatment box 2 with a vacuum pump and a matching gas-liquid separation tank.

[0020] like Figures 3-7As shown, it also includes a backwashing mechanism located inside the treatment tank 2. The backwashing mechanism includes guide grooves 18 located at both ends of the bottom edge of the main filter plate 10 and parallel to the main filter plate 10. Traction rods 11 corresponding to the edges of the main filter plate 10 are laterally movably connected to both ends of the inner side of the treatment tank 2. The traction rods 11 are located in the gap between the main filter plate 10 and the inner wall of the treatment tank 2. To prevent wastewater from falling into this gap, first barriers 17 are provided on both sides of the top of the main filter plate 10. Wastewater discharged from the discharge port 4 slowly falls between the two first barriers 17 on the top of the main filter plate 10. The two traction rods 11 are connected as one unit by multiple connecting plates 15. A guide pin 21 is provided on the side wall of the traction rod 11 to movably guide and cooperate with the guide groove 18. The traction rod 11 has a hollow structure, and its side is connected to a guide pin 21 that... The backwash pipes 16 are located at the bottom of the main filter plates 10 and correspond one-to-one. Multiple spray nozzles 20 are evenly arranged at the upper end of the backwash pipes 16. A water supply hose 9 extending to the outside of the treatment box 2 is connected to one end of the traction rod 11. The water supply hose 9 is used to connect to an external clean water source. A drive source 3 for driving the displacement of the traction rod 11 is arranged on the side of the treatment box 2. The drive source 3 is preferably a cylinder or a hydraulic cylinder. The end of its output shaft is bolted to one of the connecting plates 15 between the two traction rods 11. Thus, the drive source 3 can drive the two traction rods 11 to move laterally through the connecting plate 15. In order to increase the stability of the traction rod 11, multiple first guide rods 14 are arranged at the upper and lower ends of the inner side of the treatment box 2. The connecting plates 15 at the upper and lower ends of the traction rod 11 are in a movable guiding cooperation with the first guide rods 14.

[0021] like Figures 3-7As shown, to enhance the flushing effect, an adjustment assembly is provided on the side of the traction rod 11. The adjustment assembly includes a horizontal pipe 25 connected between the two traction rods 11 and corresponding to the backwash pipes 16. The backwash pipes 16 are movably and sealingly fitted onto the outside of the horizontal pipe 25. The upper end of the horizontal pipe 25 is provided with water outlet holes 26 corresponding to the spray nozzles 20. A traction arm 19 is provided on the side wall of the end of the backwash pipe 16. A roller 23 is rotatably provided at one end of the traction arm 19. On opposite sides of the inner cavity of the treatment box 2, drive plates 13 corresponding to the traction arms 19 are respectively provided. The sides of the drive plates 13 are evenly provided with arc-shaped protrusions, and arc-shaped grooves are provided between adjacent arc-shaped protrusions. The arc-shaped protrusion on one of the drive plates 13... The roller 23 corresponds to the arc-shaped groove on the other drive plate 13 and is used to roll in cooperation with the arc-shaped protrusion and the arc-shaped groove. In order to increase the stability of the backwash pipe 16, the length of the horizontal pipe 25 is greater than the length of the backwash pipe 16. Both ends of the horizontal pipe 25 are provided with elastic elements 24. The elastic elements 24 are preferably springs. The springs are sleeved on both ends of the horizontal pipe 25, so that when the backwash pipe 16 is displaced, one of the elastic elements 24 contracts, and the stability of the backwash pipe 16 is achieved through the reverse force. In order to ensure that the backwash pipe 16 can be displaced along the axial direction of the horizontal pipe 25, a second guide rod 22 corresponding to the traction arm 19 is provided on the side wall of the traction rod 11, and the traction arm 19 is movably sleeved with the second guide rod 22.

[0022] like Figures 1-3 , Figures 8-10 As shown, in order to facilitate the discharge of impurities, a discharge assembly is provided at the lower inner side of the processing box 2. The discharge assembly includes a discharge port 5 located on one side of the lower end of the processing box 2. A secondary filter plate 7 corresponding to the discharge port 5 is rotatably arranged on the lower side of the inner cavity of the processing box 2 near the discharge port 5. A movable plate 12 is movably sleeved on the side of the secondary filter plate 7 facing away from the discharge port 5. The secondary filter plate 7 and the movable plate 12 can extend and retract and cannot be separated. The upper end of the movable plate 12 is rotatably connected to the bottom of the traction rod 11. In order to block impurities, a second enclosure 6 in the shape of a "U" is provided on the edge of the secondary filter plate 7.

[0023] like Figures 8-10As shown, in order to seal the discharge port 5 during the wastewater filtration stage, a sealing assembly is provided between the secondary filter plate 7 and the inner wall of the treatment tank 2. The sealing assembly includes a second sealing strip 29 embedded in the edge of the secondary filter plate 7. A groove 31 is provided on the inner side of the treatment tank 2 corresponding to the edge of the discharge port 5. A first sealing strip 27 is fixedly provided at one end of the groove 31. A frame 30 is movably sealed at the end of the inner side of the groove 31 near the first sealing strip 27, and the side of the frame 30 near the first sealing strip 27 is arc-shaped. Hydraulic oil is filled between the side of the frame 30 facing away from the first sealing strip 27 and the inner wall of the groove 31. A pressure plate 28 extending to the inner side of the groove 31 is vertically and movably connected to the bottom of the inner side of the discharge port 5. The upper end of the pressure plate 28 is used to abut against the bottom of the second enclosure 6. When the auxiliary filter plate 7 vertically blocks the discharge port 5, the second enclosure 6 can press down the pressure plate 28, thereby pushing the first sealing strip 27 outward by the frame 30, and then the first sealing strip 27 generates an arc-shaped protrusion that comes into close contact with the second sealing strip 29.

[0024] Furthermore, this application also includes an embodiment, specifically a water treatment process for preparing low-iron, low-salt heavy soda ash, implemented using the aforementioned water treatment apparatus for preparing low-iron, low-salt heavy soda ash, and specifically including the following steps: Step 1: Wastewater is introduced into aeration tank 1, and air is forcibly introduced into the wastewater in aeration tank 1; Step 2: After aeration, the wastewater in aeration tank 1 is slowly released into treatment tank 2. The wastewater is then filtered through at least three main filter plates 10 in sequence. Step 3: The wastewater, after being filtered by multiple main filter plates 10, flows down and is finely filtered by ceramic filter discs 8 before being discharged to the next stage; Step 4: When the main filter plate 10 needs to be cleaned after a period of use, the backwashing mechanism drives the main filter plate 10 to tilt while flushing water from the bottom. One end of the main filter plate 10 separates from the inner wall of the treatment box 2, the tilt angle increases, and solid impurities are discharged.

[0025] Specific working principle: During use, when pretreating wastewater from soda ash production, the wastewater is introduced into aeration tank 1. Air is forcibly introduced into the wastewater through a conventional perforated pipe aeration system, oxidizing dissolved ferrous ions into insoluble ferric flocs. Simultaneously, it promotes the flocculation and sedimentation of some suspended solids, providing low-iron, low-suspended-solids influent conditions for subsequent three-stage filtration. After aeration for a period, the control valve on the discharge port 4 is opened, and the wastewater slowly drips into the inner cavity of the treatment tank 2. The wastewater then passes through three main filter plates 10 and a ceramic filter disc 8 before being discharged. The filter cloth at the top of the uppermost main filter plate 10 is a single-layer polyester woven fabric, effectively intercepting coarse particles such as silt and sand. The filter cloth at the top of the second main filter plate 10 is made of polyester base fabric with a monofilament surface layer, used to capture medium-sized flocs, such as... , The filter cloth at the top of the third main filter plate 10 is a double-layer monofilament polypropylene filter cloth, used for fine interception of microcrystals. The three layers of filter cloth are made of different materials and have decreasing pore sizes. The ceramic filter disc 8 serves as a fine filtration unit. Its core function is to deeply intercept microcrystals and colloidal iron that have penetrated the three-stage filtration through the porous cordierite ceramic filter element under vacuum suction. The ceramic filter disc 8 is equipped with a honeycomb-shaped through-hole structure, which has strong resistance to alkali corrosion. The vacuum suction system creates negative pressure in the sealed water collection chamber at the bottom of the ceramic filter disc 8 by a vacuum pump. Atmospheric pressure is used to push the wastewater through the ceramic micropores. After the filtrate is sucked into the water collection chamber, it is discharged through the drain valve. The gas is blocked by the gas-liquid separator and then discharged by the vacuum pump. Its core is to achieve efficient interception of particles through low-pressure differential physical filtration, while avoiding damage to the microcrystal structure by hydraulic shear. It should be noted that the vacuum pump and gas-liquid separator are conventional technical means, and the solution will not be described in detail.

[0026] In addition, after a period of wastewater treatment, the filter cloth at the top of the main filter plate 10 will generally become clogged, affecting its use. At this time, the drive source 3 can be controlled to drive the overall displacement of the two traction rods 11, the connecting plate 15, and the backwash pipe 16. At the same time, the water supply hose 9 is connected to an external water source and supplies water to the traction rods 11. When the traction rods 11 drive the backwash pipe 16 to move, the guide pins 21 and the guide grooves 18 will also gradually tilt the multiple main filter plates 10. During this period, water in the traction rods 11 enters the horizontal pipe 25, and then the water outlet 26 enters the spray nozzle 20, and then the main filter plates are flushed from the bottom up. Filter plate 10, impurities are flushed away from the filter cloth, and as the inclination angle of the main filter plate 10 gradually increases, one end of the main filter plate 10 separates from the inner wall of the treatment box 2, allowing impurities to be quickly discharged. Furthermore, as the backwash pipe 16 moves, it also drives the traction arm 19 to move synchronously. Under the action of the arc-shaped protrusions and arc-shaped grooves on the drive plates 13 on both sides, the roller 23 drives the backwash pipe 16 to move axially back along the horizontal pipe 25 via the traction arm 19. Consequently, the spray nozzle 20 continuously changes its flushing position. Moreover, due to the displacement of the backwash pipe 16, the outlet hole 26 and the spray nozzle 20 gradually... The staggered and aligned positions are equivalent to continuously changing the inner diameter of the spray nozzle 20, thus constantly changing the flow rate and achieving pulsed flushing. The elastic element 24 can increase the stability of the backwash pipe 16 and provide pre-tightening force. In addition, when the traction rod 11 moves, it will also cause the movable plate 12 and the secondary filter plate 7 to tilt as a whole, and the movable plate 12 will extend and retract with the secondary filter plate 7. The impurity discharge port 5 is opened, and the impurities discharged from the main filter plate 10 fall to the top of the movable plate 12 and the secondary filter plate 7. The wastewater falls down, and the impurities are blocked by the second enclosure 6. When the flushing is completed, the traction rod 11 is driven by the drive source 3. The movable plate 12 and the auxiliary filter plate 7 are reset, and the auxiliary filter plate 7 blocks the discharge port 5. The second enclosure 6 enters the discharge port 5, and the pressure plate 28 is pushed down by the downward pressure of the bottom of the second enclosure 6. The lower end of the pressure plate 28 gradually enters the groove 31, thereby squeezing the internal hydraulic oil. The hydraulic oil pushes the frame 30 to move and support the first sealing strip 27, so that the first sealing strip 27 and the second sealing strip 29 are tightly fitted, thereby achieving a seal. Alternatively, to further increase the sealing performance, an additional conventional sealing door can be added outside the discharge port 5.

[0027] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A water treatment device for preparing low-iron, low-salt heavy soda ash, characterized in that, It includes a treatment box and an aeration tank located at the top of the treatment box and connected to the treatment box. At least three main filter plates are inclinedly arranged at the upper end of the inner side of the treatment box. Filter cloth is provided on the top of the main filter plates. One end of the main filter plate is rotatably connected to the inner wall of the treatment box, and the other end abuts against the inner wall of the treatment box. It also includes a backwashing mechanism located inside the treatment tank. The backwashing mechanism includes a guide groove located at the bottom edge of the main filter plate and parallel to the main filter plate. The two ends of the inner side of the treatment tank are laterally movably connected to traction rods corresponding to the edges of the main filter plate. The side wall of the traction rod is provided with a guide pin that moves and guides the guide groove. The traction rod is a hollow structure. The side of the traction rod is connected to a backwashing pipe that corresponds to the main filter plate and is located at the bottom of the main filter plate. The upper end of the backwashing pipe is provided with a water spray nozzle. One end of the traction rod is connected to a water supply hose that extends to the outside of the treatment tank. The side of the treatment tank is provided with a drive source for driving the displacement of the traction rod.

2. The water treatment device for preparing low-iron, low-salt heavy soda ash according to claim 1, characterized in that: An adjustment assembly is provided on the side of the traction rod. The adjustment assembly includes a horizontal pipe connected to the side of the traction rod and corresponding to the backwash pipe. The backwash pipe is movably and sealingly fitted onto the outside of the horizontal pipe. The upper end of the horizontal pipe is provided with a water outlet corresponding to the water spray nozzle. A traction arm is provided on the side wall of the end of the backwash pipe. A roller is rotatably provided on one end of the traction arm. A drive plate corresponding to the traction arm is provided on each of the opposite sides of the inner cavity of the treatment box. Arc-shaped protrusions are evenly provided on the side of the drive plate. Arc-shaped grooves are provided between adjacent arc-shaped protrusions. The arc-shaped protrusion on one drive plate corresponds to the arc-shaped groove on the other drive plate. The roller is used to roll and cooperate with the arc-shaped protrusions and the arc-shaped grooves.

3. The water treatment device for preparing low-iron, low-salt heavy soda ash according to claim 2, characterized in that: The length of the horizontal tube is greater than the length of the backwash tube, and elastic elements are provided on the outside of both ends of the horizontal tube.

4. The water treatment device for preparing low-iron, low-salt heavy soda ash according to claim 1, characterized in that: The main filter plate has a first enclosure on both sides of its top edge.

5. The water treatment device for preparing low-iron, low-salt heavy soda ash according to claim 1, characterized in that: The lower inner side of the processing box is provided with a waste removal component. The waste removal component includes a waste removal port located on one side of the lower end of the processing box. A secondary filter plate corresponding to the waste removal port is rotatably arranged on the lower end of the processing box cavity near the waste removal port. A movable plate is movably sleeved on the side of the secondary filter plate facing away from the waste removal port. The upper end of the movable plate is rotatably connected to the bottom of the traction rod.

6. The water treatment apparatus for preparing low-iron, low-salt heavy soda ash according to claim 5, characterized in that: The edge of the secondary filter plate is provided with a second enclosure in the shape of a "U".

7. The water treatment apparatus for preparing low-iron, low-salt heavy soda ash according to claim 6, characterized in that: A sealing assembly is provided between the secondary filter plate and the inner wall of the treatment box. The sealing assembly includes a second sealing strip embedded in the edge of the secondary filter plate. A groove is provided on the inner side of the treatment box corresponding to the edge of the discharge port. A first sealing strip is fixedly provided at one end of the groove. A frame is movably provided on the inner side of the groove near the first sealing strip. The side of the frame near the first sealing strip is arc-shaped. Hydraulic oil is filled between the side of the frame facing away from the first sealing strip and the inner wall of the groove. A pressure plate extending to the inner side of the discharge port is vertically and movably connected to the bottom of the inner side of the discharge port. The upper end of the pressure plate is used to abut against the bottom of the second enclosure.

8. The water treatment apparatus for preparing low-iron, low-salt heavy soda ash according to claim 2, characterized in that: The side wall of the traction rod is provided with a second guide rod corresponding to the traction arm, and the traction arm is movably connected to the second guide rod.

9. The water treatment apparatus for preparing low-iron, low-salt heavy soda ash according to any one of claims 1-8, characterized in that: A ceramic filter disc is provided on the lower inner side of the processing box.

10. A water treatment process for preparing low-iron, low-salt heavy soda ash, implemented using the water treatment apparatus for preparing low-iron, low-salt heavy soda ash as described in claim 9, characterized in that... Includes the following steps: S1: Wastewater is introduced into the aeration tank, and air is forcibly introduced into the wastewater in the aeration tank; S2: After aeration, the wastewater in the aeration tank is slowly released into the treatment tank, and the wastewater is filtered step by step through at least three main filter plates. S3: Wastewater that has been filtered by multiple main filter plates falls and is then finely filtered by ceramic filter discs before being discharged to the next stage; S4: When the main filter plate needs to be cleaned after a period of use, the backwashing mechanism drives the main filter plate to tilt while flushing water from the bottom. One end of the main filter plate separates from the inner wall of the treatment tank, the tilt angle increases, and solid impurities are discharged.

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