A kind of calcium hydroxide production wastewater treatment device

Abstract

The application relates to the field of wastewater neutralization and treatment, and particularly relates to a wastewater treatment device for calcium hydroxide production. The existing device is inconvenient to control the acid agent adding speed, so that the pH value of the wastewater after treatment cannot be accurately controlled, the acid agent is not uniformly mixed with the wastewater when the acid agent is added, and the acid agent is prone to residue after being added. The wastewater treatment device for calcium hydroxide production comprises a sedimentation tank and the like; a water inlet is arranged on one side of the sedimentation tank; guide rails are fixedly connected to the two sides of the sedimentation tank; electric sliding blocks are slidably connected to the guide rails; and supporting bent arms are fixedly connected to the electric sliding blocks. During the rotation of the intercepting ring, the part, which is connected between the intercepting opening of the intercepting ring and the flow guiding opening of the flow guiding ring, gradually becomes smaller, so that the adding speed of the acid agent gradually becomes slow, that is, the pH value of the wastewater changes fast first and then slow, so that the pH value of the wastewater after treatment can be more accurately controlled.

Description

Technical Field

[0001] This invention relates to the field of wastewater neutralization and treatment, and more particularly to a wastewater treatment device for calcium hydroxide production. Background Technology

[0002] Wastewater generated during the production of calcium hydroxide mainly comes from equipment cleaning, raw material soaking, and product washing. The wastewater contains high concentrations of calcium ions, hydroxide ions, and some suspended solids. The pH value of the wastewater is usually as high as 11-13. During treatment, sulfuric acid, hydrochloric acid, or other acidic agents are usually added for acid-base neutralization to reduce the pH value to the neutral range.

[0003] However, the existing equipment is not convenient for controlling the acid addition rate, which makes it difficult to accurately control the pH value of the wastewater after treatment. Furthermore, the acid is not mixed evenly with the wastewater when added, and there is a tendency for acid residue to remain after addition. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a wastewater treatment device for calcium hydroxide production that can better control the addition of acid agent from fast to slow, more accurately control the pH value of wastewater after treatment, and mix the acid agent with the wastewater more evenly during addition, making it less likely to produce acid agent residue.

[0005] The technical implementation scheme of the present invention is as follows: a wastewater treatment device for calcium hydroxide production, comprising a sedimentation tank, an inlet on one side of the sedimentation tank, guide rails fixedly connected to both sides of the sedimentation tank, an electric slider slidably connected to each guide rail, a supporting arm fixedly connected to each electric slider, a discharge box fixedly connected between two supporting arms, a funnel fixedly connected to the upper part of the discharge box, the funnel communicating with the interior of the discharge box, a flow guiding mechanism provided at the lower part of the discharge box for guiding additives into the wastewater, and a feeding mechanism provided on the discharge box for quantitatively adding the additives in the discharge box.

[0006] More preferably, the flow guiding mechanism includes a straight pipe, which is fixedly connected to the lower end of the discharge box and communicates with the interior of the discharge box. A flow-dividing frame is fixedly connected to the lower end of the straight pipe. Two flow-dividing pipes (first and second) are fixedly connected to the lower part of the flow-dividing frame. The flow-dividing pipes (second and first), the flow-dividing frame, and the straight pipe are internally connected. A horn tube is fixedly connected to the lower end of each of the two flow-dividing pipes (first and second). A through hole is opened on one side of each horn tube, and a side rod is fixedly connected to one side of each horn tube. Each side rod has... Each tube is slidably connected with a sliding block, one side of which is located inside the through hole of the horn tube. A servo motor is fixedly connected to the lower part of one of the supporting curved arms. A drive gear is fixedly connected to the output shaft of the servo motor. A driven gear is rotatably connected to the straight tube and meshes with the drive gear. A guide ring is rotatably connected to the inner wall of the straight tube and has a guide port. Four magnet blocks are fixedly connected to the driven gear, and four magnet blocks are fixedly connected to the guide ring. The magnet blocks are magnetically opposite to the magnet blocks.

[0007] More preferably, the feeding mechanism includes two supporting bent rods, both of which are fixedly connected to one side of the sedimentation tank. Two supporting bent rods are fixedly connected to the side of the sedimentation tank away from the supporting bent rods. An inclined rod is fixedly connected between the supporting bent rods and the supporting bent rods. A vertical rod is fixedly connected to each supporting bent rod. A sliding frame is slidably connected between the two vertical rods. A return spring is connected between the sliding frame and the vertical rod. Contact wheels are rotatably connected to both sides of the sliding frame. The contact wheels contact the lower surface of the inclined rod. A rotating frame is rotatably connected to the middle of the feeding box. An inclined groove is opened on the upper part of the rotating frame. The sliding frame cooperates with the inclined groove of the rotating frame. A flow-blocking ring is fixedly connected to the lower end of the rotating frame. A flow-blocking port is opened on the flow-blocking ring.

[0008] More preferably, it also includes a rinsing mechanism, which is located on one side of the sedimentation tank. The rinsing mechanism is used to rinse away residual additives in the discharge box. The rinsing mechanism includes a piston tank, which is fixedly connected to one side of the sedimentation tank. The piston tank has several leakage holes on its side. A piston rod is slidably connected to the piston tank. A water outlet pipe is fixedly connected to one side of the piston tank. An extension pipe is slidably connected to the upper part of the water outlet pipe. A connecting spring connects the extension pipe and the water outlet pipe. A squeezing rod is fixedly connected to the piston rod. A waterproof pipe is fixedly connected to one side of the sedimentation tank. The waterproof pipe passes through the sedimentation tank. One side of the squeezing rod is located inside the waterproof pipe. A return spring connects the squeezing rod and the waterproof pipe. A crossbar is fixedly connected between the two diversion pipes. A water receiving pipe is fixedly connected to the upper part of the discharge box.

[0009] More preferably, it also includes a swing mechanism, which is disposed on the second diversion pipe. The swing mechanism is used to disperse the additives added into the wastewater. The swing mechanism includes two rack rods, both of which are fixedly connected to the bottom of the sedimentation tank. Support frames are fixedly connected to one side of each of the two diversion pipes. A crank rod is rotatably connected to each support frame. A rotating gear is fixedly connected to each crank rod. The rotating gear meshes with the rack rod. A rotating rod is rotatably connected between the two support frames. Four swing plates are fixedly connected to one side of the rotating rod. Two guide rods are fixedly connected to the rotating rod. A straight groove is opened on the guide rod. One end of the crank rod is located in the straight groove on the guide rod.

[0010] The present invention has the following advantages: 1. By controlling the addition rate of the acid agent from fast to slow, that is, the pH value of the wastewater changes from fast to slow, the pH value of the wastewater after treatment can be controlled more accurately.

[0011] 2. After the acid is added, the crossbar will contact the piston rod, and the upper part of the water inlet pipe will also contact a section of the extension pipe. As the crossbar continues to move, it will squeeze the piston rod to move horizontally together, and the water inlet pipe will also squeeze the extension pipe to move together. The connecting spring is compressed. Since there is a leakage hole on the side of the piston tank, the wastewater will fill the piston tank first. Then, the horizontal movement of the piston rod will squeeze the wastewater in the piston tank into the outlet pipe, and then add it into the discharge box through the extension pipe and the water inlet pipe. Adding wastewater to the discharge box can prevent acid residue from remaining in the discharge box.

[0012] 3. When the second and first branch pipes move horizontally, the support frame will drive the rotating gear and the crank to move horizontally together. Then the rotating gear will rotate at the same time, which will drive the crank to rotate together. The rotation of the crank will drive the guide rod to swing back and forth. The swinging of the guide rod will then drive the swing plate to swing back and forth. Since the swing plate is located on one side of the trumpet pipe, the swinging of the swing plate will diffuse the acid flowing out of the trumpet pipe, thus making the acid and wastewater mix more thoroughly. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 This is a three-dimensional structural diagram of the flow guiding mechanism of the present invention.

[0015] Figure 3 This is a cross-sectional three-dimensional structural diagram of the straight pipe and the flow divider frame of the present invention.

[0016] Figure 4 For the present invention Figure 3 A magnified three-dimensional structural diagram at point A in the middle.

[0017] Figure 5 This is a schematic diagram of the three-dimensional structure of the separate horn tube and sliding block of the present invention.

[0018] Figure 6 This is a cross-sectional three-dimensional structural diagram of the horn tube and sliding block of the present invention.

[0019] Figure 7 This is a cross-sectional perspective view of the straight tube and the feeding box of the present invention.

[0020] Figure 8 This is a schematic diagram of the separate three-dimensional structure of the flow guiding ring and the flow intercepting ring of the present invention.

[0021] Figure 9 This is a three-dimensional structural diagram of the rinsing mechanism of the present invention.

[0022] Figure 10 This is a schematic diagram of the three-dimensional separation structure of the rinsing mechanism of the present invention.

[0023] Figure 11 This is a three-dimensional structural diagram of the swing mechanism of the present invention.

[0024] Figure 12 For the present invention Figure 11 A magnified three-dimensional structural diagram at point B.

[0025] The components in the attached diagram are labeled as follows: 1. Sedimentation tank; 2. Inlet; 31. Guide rail; 32. Electric slider; 33. Support arm; 34. Discharge box; 35. Funnel; 41. Straight pipe; 42. Diverter frame; 431. Diverter pipe one; 432. Diverter pipe two; 44. Horn tube; 45. Side rod; 46. Sliding block; 47. Servo motor; 48. Drive gear; 49. Driven gear; 410. Guide ring; 411. Magnet block one; 412. Magnet block two; 51. Support arm one; 52. Support... 53. Inclined rod, 54. Vertical rod, 55. Sliding frame, 56. Return spring, 57. Contact wheel, 58. Rotating frame, 59. Flow-stopping ring, 61. Piston tank, 62. Piston rod, 63. Water outlet pipe, 64. Extension pipe, 65. Connecting spring, 66. Extrusion rod, 67. Waterproof pipe, 68. Return spring, 69. Horizontal bar, 610. Water inlet pipe, 71. Rack rod, 72. Support frame, 73. Curved rod, 74. Rotating gear, 75. Rotating rod, 76. Swing plate, 77. Guide rod. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. 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.

[0027] Example 1 A wastewater treatment device for calcium hydroxide production, such as Figure 1-12 As shown, the system includes a sedimentation tank 1, an inlet 2 on one side of the sedimentation tank 1, guide rails 31 fixedly connected to both sides of the sedimentation tank 1, an electric slider 32 slidably connected to each guide rail 31, a support arm 33 fixedly connected to each electric slider 32, a discharge box 34 fixedly connected between two support arms 33, a funnel 35 fixedly connected to the upper part of the discharge box 34, the funnel 35 communicating with the interior of the discharge box 34, a flow guiding mechanism at the lower part of the discharge box 34 for guiding the additive into the wastewater, and a feeding mechanism on the discharge box 34 for quantitatively adding the additive in the discharge box 34.

[0028] The flow guiding mechanism includes a straight pipe 41, which is fixedly connected to the lower end of the discharge box 34 and communicates with the interior of the discharge box 34. A flow dividing frame 42 is fixedly connected to the lower end of the straight pipe 41. Two flow dividing pipes 431 and two flow dividing pipes 432 are fixedly connected to the lower part of the flow dividing frame 42. The flow dividing pipes 432, the flow dividing pipes 431, the flow dividing frame 42, and the straight pipe 41 are internally connected. A horn pipe 44 is fixedly connected to the lower end of each of the two flow dividing pipes 431 and the two flow dividing pipes 432. A through hole is opened on one side of each horn pipe 44. A side rod 45 is fixedly connected to one side of each horn pipe 44, and each side rod 45 has a sliding mechanism. A sliding block 46 is connected to the horn tube 44. One side of the sliding block 46 is located in the through hole of the horn tube 44. A servo motor 47 is fixedly connected to the lower part of one of the supporting curved arms 33. A drive gear 48 is fixedly connected to the output shaft of the servo motor 47. A driven gear 49 is rotatably connected to the straight tube 41. The driven gear 49 meshes with the drive gear 48. A guide ring 410 is rotatably connected to the inner wall of the straight tube 41. A guide port is opened on the guide ring 410. Four magnet blocks 411 are fixedly connected to the driven gear 49. Four magnet blocks 412 are fixedly connected to the guide ring 410. The magnet blocks 412 have opposite magnetism to the magnet blocks 411.

[0029] The feeding mechanism includes two supporting curved rods 51, both of which are fixedly connected to one side of the sedimentation tank 1. Two supporting curved rods 52 are fixedly connected to the side of the sedimentation tank 1 away from the supporting curved rods 51. An inclined rod 53 is fixedly connected between the supporting curved rods 51 and the supporting curved rods 52. A vertical rod 54 is fixedly connected to each supporting curved rod 33. A sliding frame 55 is slidably connected between the two vertical rods 54. A return spring 56 is connected between the sliding frame 55 and the vertical rod 54. Contact wheels 57 are rotatably connected to both sides of the sliding frame 55. The contact wheels 57 contact the lower surface of the inclined rod 53. A rotating frame 58 is rotatably connected to the middle of the discharge box 34. An inclined groove is opened on the upper part of the rotating frame 58. The sliding frame 55 cooperates with the inclined groove of the rotating frame 58. A flow-blocking ring 59 is fixedly connected to the lower end of the rotating frame 58. A flow-blocking port is opened on the flow-blocking ring 59.

[0030] In actual operation, the wastewater generated during calcium hydroxide production is alkaline, so it needs to be neutralized by adding an acid. Initially, the intercepting port of the intercepting ring 59 is not aligned with the guiding port of the guiding ring 410, so the straight pipe 41 is blocked. The wastewater is added to the sedimentation tank 1 through the inlet 2. Then, the acid is added to the discharge box 34 through the funnel 35. After the addition is completed, the electric slider 32 and the servo motor 47 are started. The electric slider 32 drives the discharge box 34, the first branch pipe 431 and the second branch pipe 432 to move horizontally away from the inlet 2. The servo motor 47 will drive... The driving gear 48 rotates 180°, which in turn drives the driven gear 49 to rotate 180°. The rotation of the driven gear 49 drives the first magnet block 411 to rotate. The rotation of the first magnet block 411 drives the second magnet block 412 and the guide ring 410 to rotate 180° together through magnetic force. This makes the intercepting port of the intercepting ring 59 completely aligned with the guide port of the guide ring 410. Then, the acid in the discharge box 34 flows into the first branch pipe 431 and the second branch pipe 432 through the straight pipe 41 and the branch frame 42 respectively, and finally flows out from the trumpet pipe 44 to neutralize the wastewater inside the sedimentation tank 1. 4. When adding acid during horizontal movement, the contact wheel 57 is squeezed by the inclined rod 53, which in turn drives the sliding frame 55 to move downward. The return spring 56 is compressed. The downward movement of the sliding frame 55 by the contact wheel 57 will cause the rotating frame 58 to rotate 180° through the inclined groove on the rotating frame 58. The rotation of the rotating frame 58 will cause the intercepting ring 59 to rotate 180°. During the 180° rotation of the intercepting ring 59, the connection between the intercepting port of the intercepting ring 59 and the guiding port of the guiding ring 410 gradually becomes smaller, thus causing the acid addition rate to slow down from fast to slow. That is, the pH value of the wastewater changes quickly at first and then slowly. To ensure that the pH value of the treated wastewater can be controlled more accurately, when the electric slider 32 moves horizontally towards the inlet 2 after the acid is added, the sliding block 46 will move horizontally away from the horn tube 44 due to the water flow, thereby opening the through hole on one side of the horn tube 44. In this way, when the horn tube 44 moves towards the inlet 2 in the wastewater, the water will pass through the through hole on one side of the horn tube 44, so the water will not easily rush upward into the discharge box 34 through the first diversion pipe 431 and the second diversion pipe 432, thus preventing some wastewater from remaining.

[0031] Example 2 Based on Example 1, such as Figure 9-10As shown, it also includes a rinsing mechanism, which is located on one side of the sedimentation tank 1. The rinsing mechanism is used to rinse away residual additives in the discharge box 34. The rinsing mechanism includes a piston tank 61, which is fixedly connected to one side of the sedimentation tank 1. Several leakage holes are opened on the side of the piston tank 61. A piston rod 62 is slidably connected to the piston tank 61. A water outlet pipe 63 is fixedly connected to one side of the piston tank 61, and an extension pipe 64 is slidably connected to the upper part of the water outlet pipe 63. A connecting spring 65 connects the extension pipe 64 to the outlet pipe 63. A squeezing rod 66 is fixedly connected to the piston rod 62. A waterproof pipe 67 is fixedly connected to one side of the sedimentation tank 1. The waterproof pipe 67 passes through the sedimentation tank 1. One side of the squeezing rod 66 is located inside the waterproof pipe 67. A return spring 68 connects the squeezing rod 66 and the waterproof pipe 67. A crossbar 69 is fixedly connected between the two diversion pipes 432. A water receiving pipe 610 is fixedly connected to the upper part of the discharge box 34.

[0032] Diverter pipe 2 432 moves horizontally away from inlet 2. When acid is added to the wastewater, diverter pipe 2 432 will drive crossbar 69 to move horizontally closer to piston rod 62. After the acid is added, crossbar 69 will contact piston rod 62, and the upper part of water inlet pipe 610 will also contact extension pipe 64. As crossbar 69 continues to move, it will squeeze piston rod 62 to move horizontally together, and water inlet pipe 610 will also squeeze extension pipe 64 to move together. Connecting spring 65 is compressed. Since there is a leakage hole on the side of piston tank 61, the wastewater will... First, the piston tank 61 is filled. Then, the piston rod 62 moves horizontally, squeezing the wastewater in the piston tank 61 into the outlet pipe 63. Then, it is added into the discharge box 34 through the extension pipe 64 and the water receiving pipe 610. Since the intercepting ring 59 rotates 180° after the acid is added, the intercepting port of the intercepting ring 59 and the guiding port of the guiding ring 410 are not aligned. Therefore, the wastewater added into the discharge box 34 will flow back into the sedimentation tank 1 when the intercepting ring 59 is reset. Adding wastewater to the discharge box 34 can make it less likely that there will be acid residue in the discharge box 34.

[0033] Example 3 Based on Example 2, such as Figure 11-12As shown, it also includes a swing mechanism, which is disposed on the second diversion pipe 432. The swing mechanism is used to disperse the additives added into the wastewater. The swing mechanism includes two rack rods 71, both of which are fixedly connected to the bottom of the sedimentation tank 1. Support frames 72 are fixedly connected to one side of each of the two diversion pipes 432. A crank rod 73 is rotatably connected to each support frame 72. A rotating gear 74 is fixedly connected to each crank rod 73. The rotating gear 74 meshes with the rack rod 71. A rotating rod 75 is rotatably connected between the two support frames 72. Four swing plates 76 are fixedly connected to one side of the rotating rod 75. Two guide rods 77 are fixedly connected to the rotating rod 75. A straight groove is opened on the guide rod 77. One end of the crank rod 73 is located in the straight groove on the guide rod 77.

[0034] When the second diversion pipe 432 and the first diversion pipe 431 move horizontally, the support frame 72 will drive the rotating gear 74 and the crank 73 to move horizontally together. Then the rotating gear 74 will rotate at the same time, which will drive the crank 73 to rotate together. The rotation of the crank 73 will drive the guide rod 77 to swing back and forth. The swinging of the guide rod 77 will drive the swing plate 76 to swing back and forth. Since the swing plate 76 is located on one side of the trumpet pipe 44, the swinging of the swing plate 76 will diffuse the acid flowing out of the trumpet pipe 44, thus making the acid and wastewater mix more thoroughly.

[0035] Although this disclosure has been shown and described with reference to specific exemplary embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made to this disclosure without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents. Therefore, the scope of this disclosure should not be limited to the above embodiments, but should be defined not only by the appended claims, but also by their equivalents.

Claims

1. A wastewater treatment device for calcium hydroxide production, characterized in that, The system includes a sedimentation tank (1), an inlet (2) on one side of the sedimentation tank (1), guide rails (31) fixedly connected to both sides of the sedimentation tank (1), an electric slider (32) slidably connected to each guide rail (31), a support arm (33) fixedly connected to each electric slider (32), a discharge box (34) fixedly connected between two support arms (33), a funnel (35) fixedly connected to the upper part of the discharge box (34), the funnel (35) communicating with the interior of the discharge box (34), a flow guiding mechanism provided at the lower part of the discharge box (34), the flow guiding mechanism being used to guide the additive into the wastewater, and a feeding mechanism provided on the discharge box (34), the feeding mechanism being used to quantitatively add the additive in the discharge box (34); The flow guiding mechanism includes a straight pipe (41), which is fixedly connected to the lower end of the discharge box (34). The straight pipe (41) communicates with the interior of the discharge box (34). A flow divider frame (42) is fixedly connected to the lower end of the straight pipe (41). Two flow divider pipes (431) and two flow divider pipes (432) are fixedly connected to the lower part of the flow divider frame (42). The flow divider pipes (432), the flow divider pipes (431), the flow divider frame (42), and the straight pipe (41) are internally connected. A horn tube (44) is fixedly connected to the lower end of each of the two flow divider pipes (431) and the two flow divider pipes (432). A through hole is opened on one side of each horn tube (44). A side rod (45) is fixedly connected to one side of each side rod (45). A sliding plate is mounted on each side rod (45). A sliding block (46) is connected to the haptic connection. One side of the sliding block (46) is located in the through hole of the horn tube (44). A servo motor (47) is fixedly connected to the lower part of one of the supporting curved arms (33). A drive gear (48) is fixedly connected to the output shaft of the servo motor (47). A driven gear (49) is rotatably connected to the straight tube (41). The driven gear (49) meshes with the drive gear (48). A guide ring (410) is rotatably connected to the inner wall of the straight tube (41). A guide port is opened on the guide ring (410). Four magnet blocks (411) are fixedly connected to the driven gear (49). Four magnet blocks (412) are fixedly connected to the guide ring (410). The magnet blocks (412) have opposite magnetism to the magnet blocks (411).

2. The wastewater treatment device for calcium hydroxide production according to claim 1, characterized in that, The feeding mechanism includes two supporting curved rods (51), both of which are fixedly connected to one side of the sedimentation tank (1). Two supporting curved rods (52) are fixedly connected to the side of the sedimentation tank (1) away from the supporting curved rods (51). An inclined rod (53) is fixedly connected between the supporting curved rods (51) and the supporting curved rods (52). A vertical rod (54) is fixedly connected to each supporting curved rod (33). The two vertical rods (54)... 4) A sliding frame (55) is slidably connected between the sliding frame (55) and the upright (54), and a return spring (56) is connected between the sliding frame (55) and the upright (54). Contact wheels (57) are rotatably connected to both sides of the sliding frame (55), and the contact wheels (57) are in contact with the lower surface of the inclined rod (53). A rotating frame (58) is rotatably connected to the middle of the feeding box (34), and a flow-blocking ring (59) is fixedly connected to the lower end of the rotating frame (58). A flow-blocking port is opened on the flow-blocking ring (59).

3. A wastewater treatment device for calcium hydroxide production according to claim 2, characterized in that, The upper part of the rotating frame (58) has an inclined groove, and the sliding frame (55) cooperates with the inclined groove of the rotating frame (58).

4. A wastewater treatment device for calcium hydroxide production according to claim 2, characterized in that, It also includes a rinsing mechanism, which is located on one side of the sedimentation tank (1). The rinsing mechanism is used to rinse the residual additives in the discharge box (34). The rinsing mechanism includes a piston tank (61), which is fixedly connected to one side of the sedimentation tank (1). A piston rod (62) is slidably connected to the piston tank (61). A water outlet pipe (63) is fixedly connected to one side of the piston tank (61). An extension pipe (64) is slidably connected to the upper part of the water outlet pipe (63). The extension pipe (64) and the water outlet pipe (63) are connected to each other. A connecting spring (65) is connected between them. A squeezing rod (66) is fixedly connected to the piston rod (62). A waterproof pipe (67) is fixedly connected to one side of the sedimentation tank (1). The waterproof pipe (67) passes through the sedimentation tank (1). One side of the squeezing rod (66) is located inside the waterproof pipe (67). A return spring (68) is connected between the squeezing rod (66) and the waterproof pipe (67). A crossbar (69) is fixedly connected between the two diversion pipes (432). A water receiving pipe (610) is fixedly connected to the upper part of the discharge box (34).

5. A wastewater treatment device for calcium hydroxide production according to claim 4, characterized in that, The piston can (61) has several leakage holes on its side.

6. A wastewater treatment device for calcium hydroxide production according to claim 4, characterized in that, It also includes a swing mechanism, which is set on the second diversion pipe (432). The swing mechanism is used to disperse the additives added into the wastewater. The swing mechanism includes two rack rods (71). The two rack rods (71) are fixedly connected to the bottom of the sedimentation tank (1). Support frames (72) are fixedly connected to one side of the two diversion pipes (432). A crank rod (73) is rotatably connected to each support frame (72). A rotating gear (74) is fixedly connected to each crank rod (73). The rotating gear (74) meshes with the rack rod (71). A rotating rod (75) is rotatably connected between the two support frames (72). Four swing plates (76) are fixedly connected to one side of the rotating rod (75). Two guide rods (77) are fixedly connected to the rotating rod (75). A straight groove is opened on the guide rod (77). One end of the crank rod (73) is located in the straight groove on the guide rod (77).

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