Washing wastewater treatment equipment for producing calcium-based hydrotalcite PVC (polyvinyl chloride) composite heat stabilizer

Abstract

The invention relates to the technical field of wastewater treatment, and discloses washing wastewater treatment equipment for calcium-based hydrotalcite PVC composite heat stabilizer production, which comprises a flocculation basin, an annular plate arranged in the flocculation basin, a fixed cylinder fixedly connected to the top surface of the annular plate, a plurality of grid plates axially arranged on the inner side of the fixed cylinder, and a movable cylinder arranged on the outer side of the fixed cylinder, a plurality of through holes are annularly formed in the movable cylinder at equal intervals, drainage plates are fixedly connected to the positions, close to the through holes, of the outer wall of the movable cylinder, and mixing assemblies are arranged at the positions, close to the through holes, of the outer wall of the movable cylinder. The movable barrel is matched with the fixed barrel and the annular plate to form a liquid directional flowing path, the flowing path forms an annular stirring area and a T-shaped dispersing area, stirring blades are driven by water flow to rotate in the annular stirring area to achieve primary rapid mixing of liquid and a flocculating agent, and then deep secondary mixing is conducted under the action of multiple layers of grid plates in the T-shaped dispersing area. Gradient mixing in different areas is achieved, and the compactness of alumen ustum is improved while the alumen ustum is prevented from being damaged.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater treatment device for the production of calcium-based hydrotalcite PVC composite heat stabilizers. Background Technology

[0002] As an important inorganic functional material, calcium-based hydrotalcite is often produced industrially using a co-precipitation method. After synthesis, the filter cake needs to be washed multiple times to remove residual salts and impurity ions, resulting in a large amount of washing wastewater. This wastewater is characterized by a high pH value, high salt content, and contains a large number of stable suspended micron and submicron-sized hydrotalcite particles, making sedimentation and separation extremely difficult.

[0003] Flocculation and sedimentation are the core steps in the treatment of this washing wastewater. By adding flocculants and coagulants, fine particles can be destabilized and aggregated into easily settling flocs, laying the foundation for subsequent advanced treatment and reuse. The mixing equipment in the flocculation tank is crucial to the flocculation effect, and it needs to provide an optimized hydraulic environment for particle collision.

[0004] However, existing traditional mechanical mixing equipment has significant drawbacks: First, the flow field distribution created by single-shaft paddle mixers is extremely uneven, with excessively high G-values ​​in the impeller near-zone, easily breaking up the initial flocs; while the G-values ​​in dead zones such as the pool walls and corners are too low, preventing some hydrotalcite particles from effectively participating in the reaction and reducing flocculant utilization. Second, the uneven flow field makes it difficult to accurately achieve the ideal "gradual flocculation" condition, resulting in flocs with wide particle size distribution, poor density, and poor settling performance. Ultimately, this leads to unstable effluent turbidity, increased reagent dosage costs, and a heavier load on subsequent sedimentation units, restricting the overall efficiency and economy of the wastewater treatment process.

[0005] Therefore, developing treatment equipment that can achieve efficient and uniform mixing and precise control of flocculation kinetics for the wastewater from calcium-based hydrotalcite washing is of great significance for improving resource recovery efficiency and reducing environmental protection costs. Summary of the Invention

[0006] Given that existing technologies have the problem that stirring equipment cannot form a uniform stirring force in the flocculation tank, resulting in different mixing densities in different areas and restricting the efficiency of wastewater treatment, a washing wastewater treatment device for the production of calcium-based hydrotalcite PVC composite heat stabilizer is proposed.

[0007] Its purpose is to form a directional circulating flow path in the flocculation tank, and to carry out mixing with different G values ​​in different areas, so that the liquid can achieve the effect of uniform mixing with flocculant when completing one circulation flow.

[0008] The technical solution of this invention is a wastewater treatment device for the production of calcium-based hydrotalcite PVC composite heat stabilizer, comprising a flocculation tank, a motor, and a drive shaft. An annular plate is installed inside the flocculation tank, and a fixed cylinder is fixedly connected to the top surface of the annular plate. Multiple grid plates are axially arranged on the inner side of the fixed cylinder. A liquid addition pipe is installed on the outer wall of the fixed cylinder, with one end connected to an external liquid supply device. A movable cylinder is installed outside the fixed cylinder, with the top surface of the fixed cylinder being lower than the top surface of the movable cylinder. The lower end of the drive shaft drives the movable cylinder to rotate. Multiple through holes are evenly spaced in an annular pattern on the movable cylinder. A flow guide plate is fixedly connected to the outer wall of the movable cylinder near the through holes. A mixing component is installed on the outer wall of the movable cylinder near the through holes. The mixing component mixes the liquid between the movable cylinder and the fixed cylinder and drives the liquid to flow into the fixed cylinder. The mixing component includes two vertically distributed support bases, which are fixedly installed on the inner wall of the movable cylinder. A rotating shaft is rotatably connected between the two support bases. Multiple stirring blades are axially spaced at equal intervals on the rotating shaft, and connecting rings are fixedly connected to both ends of the rotating shaft. Multiple guide plates are arranged in a ring at equal intervals between the two connecting rings.

[0009] Furthermore, a connecting frame is fixedly connected to the top surface of the movable cylinder, and the lower end of the drive shaft is fixedly connected to the connecting frame.

[0010] Furthermore, the liquid addition pipeline includes an annular pipe fixedly installed on the outer wall of the fixed cylinder. The annular pipe has multiple liquid outlet holes arranged in an annular pattern at equal intervals. A liquid delivery pipe is fixedly connected to the annular pipe, and the other end of the liquid delivery pipe passes through the bottom of the annular plate and extends to the outside of the flocculation tank.

[0011] Furthermore, the grid plate includes an annular seat that is fixedly connected to the inner wall of the fixed cylinder. Multiple inclined plates are fixedly connected inside the annular seat. The multiple inclined plates are vertically crisscrossed, arranged in the same direction, and symmetrically arranged between adjacent inclined plates.

[0012] Furthermore, the pore size of the plurality of mesh plates gradually increases from top to bottom.

[0013] Furthermore, multiple base plates are arranged in a ring at equal intervals below the annular plate. The base plates have an I-shaped structure, and their upper and lower ends are respectively connected and fixed to the bottom surface of the annular plate and the bottom surface of the flocculation tank.

[0014] Furthermore, both ends of the guide plate are fixedly connected to a connecting shaft, which is rotatably connected to a connecting ring. One end of the connecting shaft passes through the connecting ring and is sequentially fixedly connected to a gear and a square block. The support base has two arc-shaped grooves on the side facing the connecting ring. The square block is slidably disposed in the corresponding arc-shaped groove. An arc-shaped rack is provided between the ends of the two arc-shaped grooves and is fixedly connected to the support base. The arc-shaped rack meshes with the gear for transmission.

[0015] Furthermore, multiple turbulence-inducing columns are fixedly connected to the outer wall of the fixed cylinder. A turbulence-inducing inclined surface is provided on the side of the turbulence-inducing column that is in the same direction of rotation as the movable cylinder. The angles of the multiple turbulence-inducing inclined surfaces are different.

[0016] Furthermore, the turbulence column is provided with multiple inclined riser grooves, and the inclination direction of the riser grooves is upward along the rotation direction of the movable cylinder.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The movable cylinder, fixed cylinder, and annular plate work together to form a directional liquid flow path. The flow path forms an annular stirring zone and a T-shaped dispersion zone. In the annular stirring zone, the water flow drives the stirring blades to rotate, achieving initial rapid mixing of the liquid and flocculant. Subsequently, under the action of the multi-layer grid plate in the T-shaped dispersion zone, deep secondary mixing is carried out, achieving gradient mixing in different zones, avoiding the destruction of flocs while improving the density of flocs.

[0018] 2. The guide plate changes its angle during rotation. The guide plate near the through hole maintains the maximum contact area with the water flow, thereby effectively generating thrust to drive the stirring blades to rotate. The principle is that the tangent of the guide plate at the through hole is parallel to the corresponding position of the connecting ring. On the one hand, it can significantly reduce the rotational resistance of the mixing component in the liquid, avoid generating excessive radial turbulence and destroying the flocs. On the other hand, it can reduce the outward loss of liquid in the mixing component area, prolong the mixing time of flocculant and wastewater, and enhance the mixing effect in the annular stirring area.

[0019] 3. After passing through different turbulence columns, the liquid forms eddies and wakes of varying degrees, which counteract the superposition effect of the circumferential flow field generated when the mixing component rotates, breaking the uniformity of the flow field, enabling the mixing component to effectively contact the liquid in the annular stirring area, promoting the deep diffusion and fusion of flocculant and wastewater, and improving the mixing uniformity. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the movable cylinder and diversion plate structure of the present invention; Figure 3 This is a schematic cross-sectional view of the fixed cylinder and movable cylinder structure of the present invention; Figure 4 This is a schematic cross-sectional view of the grid plate structure of the present invention; Figure 5 This is a schematic diagram of the hybrid component structure of the present invention; Figure 6 This is a schematic diagram showing the disassembled structure of the hybrid component of the present invention; Figure 7 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A in the middle; Figure 8 This is a schematic plan view of the guide plate structure of the present invention; Figure 9 This is a schematic diagram of the turbulence column structure of the present invention.

[0021] In the picture: 1. Flocculation tank; 2. Motor; 3. Drive shaft; 4. Annular plate; 5. Fixed cylinder; 6. Liquid addition pipeline; 61. Annular pipe; 62. Infusion pipe; 7. Movable cylinder; 8. Connecting frame; 9. Grid plate; 91. Annular seat; 92. Inclined plate; 10. Drainage plate; 11. Mixing component; 111. Support seat; 112. Rotating shaft; 113. Stirring blade; 114. Connecting ring; 115. Guide plate; 116. Coupling shaft; 12. Base plate; 13. Gear; 14. Square block; 15. Arc groove; 16. Arc rack; 17. Turbulence column; 18. Turbulence inclined surface; 19. Upflow channel; 20. Through hole. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Example 1, referring to Figures 1-6This invention provides a wastewater treatment device for the production of calcium-based hydrotalcite PVC composite heat stabilizers, comprising a flocculation tank 1, a motor 2, and a drive shaft 3. An annular plate 4 is installed inside the flocculation tank 1, and a fixed cylinder 5 is fixedly connected to the top surface of the annular plate 4. Multiple mesh plates 9 are axially arranged on the inner side of the fixed cylinder 5. A liquid supply pipe 6 is installed on the outer wall of the fixed cylinder 5, with one end connected to an external liquid supply device. A movable cylinder 7 is installed outside the fixed cylinder 5, with the top surface of the fixed cylinder 5 being lower than the top surface of the movable cylinder 7. The lower end of the drive shaft 3 drives the movable cylinder 7 to rotate. Multiple through holes 20 are evenly spaced in a ring on the movable cylinder 7. A flow guide plate 10 is fixedly connected near the through hole 20. A mixing component 11 is provided on the outer wall of the movable cylinder 7 near the through hole 20. The mixing component 11 mixes the liquid between the movable cylinder 7 and the fixed cylinder 5 and drives the liquid to flow into the fixed cylinder 5. The mixing component 11 includes two vertically distributed support seats 111. The support seats 111 are fixedly installed on the inner wall of the movable cylinder 7. A rotating shaft 112 is rotatably connected between the two support seats 111. Multiple stirring blades 113 are axially and equally spaced on the rotating shaft 112. Connecting rings 114 are fixedly connected to both ends of the rotating shaft 112. Multiple flow guide plates 115 are arranged in a ring and equally spaced between the two connecting rings 114.

[0024] Specifically, the movable cylinder 7 and the fixed cylinder 5 cooperate to form an annular stirring area. The interior of the fixed cylinder 5, together with the annular plate 4 and the bottom of the flocculation tank 1, forms a T-shaped diffusion area. When the motor 2 drives the movable cylinder 7 to rotate via the drive shaft 3, the guide plate 10 on the outer wall of the movable cylinder 7 rotates synchronously, continuously guiding the liquid in the edge area of ​​the flocculation tank 1 to the annular stirring area through the through hole 20. The flowing liquid impacts the guide plate 115 of the mixing component 11, thereby driving the rotating shaft 112 and the stirring blade 113 to rotate. At the same time, the liquid addition pipeline 6 precisely sprays flocculant into the annular stirring area. The rotation of the stirring blade 113 achieves rapid and uniform mixing of the flocculant and wastewater, and the upward thrust generated during the rotation of the stirring blade 113 is achieved. The force, combined with the pressure generated by the liquid continuously entering the annular stirring zone, causes the mixed liquid to enter the T-shaped diffusion zone along the upper port of the fixed cylinder 5, and finally flow along this zone and disperse to the bottom edge of the flocculation tank 1. When the liquid flows in the T-shaped diffusion zone, it passes through the multi-layer grid plate 9. Under the blocking and diversion effect of the grid plate 9, multiple small-area turbulence is formed. This not only achieves deep secondary mixing of liquid and flocculant, but also promotes uniform formation and increased density of flocs. It effectively avoids the problems of uneven flow field and easy floc breakage that exist in traditional stirring, significantly improves the utilization rate of flocculant and solid-liquid separation efficiency, reduces effluent turbidity, reduces the load of subsequent treatment units, and improves the stability and economy of overall wastewater treatment.

[0025] This design, through a rational layout and structural coordination, enables the liquid to form a directional flow trajectory within the flocculation tank 1, achieving gradient mixing in different regions of the flow path. This involves rapid fusion of flocculant and wastewater in the annular stirring zone, and deep secondary mixing via the grid plate 9 in the T-shaped diffusion zone. This effectively avoids the problem of the formed flocs being destroyed by the stirring shear force, while also promoting uniform mixing of the system and significantly improving the quality and density of the flocs. Furthermore, compared to traditional stirring structures, this design eliminates the need to adjust the speed of motor 2 to control the stirring G-value, precisely matching the process requirements of "gradual flocculation," greatly simplifying the operation process and significantly improving the convenience and stability of wastewater treatment.

[0026] Reference Figure 2 A connecting frame 8 is fixedly connected to the top surface of the movable cylinder 7, and the lower end of the drive shaft 3 is fixedly connected to the connecting frame 8.

[0027] Specifically, the lower end of the movable cylinder 7 is close to the top surface of the annular plate 4. The motor 2 drives the movable cylinder 7 to rotate synchronously through the drive shaft 3 and the connecting frame 8. The diversion plate 10 diverts the liquid in the inner wall area of ​​the flocculation tank 1 into the movable cylinder 7. Together with the mixing component 11 and the liquid addition pipeline 6, the liquid flowing into the movable cylinder 7 is mixed evenly.

[0028] Reference Figure 3 The liquid addition pipeline 6 includes an annular pipe 61 fixedly installed on the outer wall of the fixed cylinder 5. Multiple liquid outlet holes are opened in an annular pattern at equal intervals on the annular pipe 61. A liquid delivery pipe 62 is fixedly connected to the annular pipe 61. The other end of the liquid delivery pipe 62 passes through the bottom of the annular plate 4 and extends to the outside of the flocculation tank 1.

[0029] Specifically, the external liquid supply equipment continuously delivers flocculant to the annular pipe 61 fixed to the outer wall of the fixed cylinder 5 through the liquid delivery pipe 62. Multiple liquid outlet holes with equal spacing in a ring on the annular pipe 61 can spray the flocculant evenly and accurately into the annular mixing area, forming a synergistic effect with the multiple mixing components 11 operating synchronously in this area, allowing the flocculant to diffuse rapidly in the liquid, thereby achieving efficient and uniform mixing of flocculant and wastewater, laying a good foundation for subsequent floc formation.

[0030] Reference Figure 4 The grid plate 9 includes an annular seat 91 that is fixed to the inner wall of the fixed cylinder 5. Multiple inclined plates 92 are fixedly connected inside the annular seat 91. The multiple inclined plates 92 are vertically crisscrossed, arranged in the same direction, and symmetrically arranged between two adjacent inclined plates 92.

[0031] Specifically, after the liquid and flocculant are mixed, they enter the interior through the upper port of the fixed cylinder 5, and then flow directionally from top to bottom, passing through multiple layers of grid plates 9 in sequence. The multiple inclined plates 92 of the grid plates 9 together form alternating channels with "large upper opening and small lower opening" and "small upper opening and large lower opening". When the liquid flows through channels with different structures, it forms differentiated flow velocities. When two fluids with different flow velocities meet, they will naturally generate small-area vortices. These vortices can further enhance the deep mixing of the liquid and flocculant, and because there is no strong external shearing force, they can avoid destroying the formed flocs, ensuring stable growth and dense formation of the flocs.

[0032] Reference Figure 4 The pores of the multiple mesh plates 9 gradually increase from top to bottom.

[0033] Specifically, the pores of the multiple grid plates 9 gradually increase from top to bottom, and the corresponding channel pore diameter also increases accordingly. This causes the number of eddies generated when the liquid flows through each layer of grid plates 9 from top to bottom to gradually decrease. The coagulation enhancement effect of the grid plates 9 on the liquid and flocculant weakens in a gradient manner, which not only meets the process requirements of "gradual reduction flocculation" but also avoids the flocs formed later from being broken by the impact of eddies. This ensures the continuous and stable growth of flocs and improves their density, thereby optimizing the solid-liquid separation effect and improving the overall wastewater treatment efficiency.

[0034] Reference Figure 2 , Figure 3 Below the annular plate 4, there are multiple base plates 12 arranged in a ring at equal intervals. The base plates 12 have an I-shaped structure, and the upper and lower ends of the base plates 12 are respectively connected and fixed to the bottom surface of the annular plate 4 and the bottom surface of the flocculation tank 1.

[0035] Specifically, the multiple base plates 12 work together to precisely guide the liquid flow within the T-shaped diffusion area, guiding the mixed liquid to flow smoothly radially to the inner wall area of ​​the flocculation tank 1. The radially flowing liquid and the axially rotating liquid on the outside of the movable cylinder 7 form a convective mixture, which can effectively weaken the intensity of the rotating flow field generated by the rotation of the movable cylinder 7, avoid strong swirling flow from impacting and damaging the formed flocs, ensure that the flocs remain stable in the flocculation tank 1, further improve the sedimentation and separation efficiency, and optimize the overall wastewater treatment effect.

[0036] Example 2, refer to Figures 5-8This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: both ends of the guide plate 115 in the length direction are fixedly connected to the connecting shaft 116. The connecting shaft 116 is rotatably connected to the connecting ring 114. One end of the connecting shaft 116 passes through the connecting ring 114 and is sequentially fixedly connected to the gear 13 and the square block 14. The support base 111 is provided with two arc-shaped grooves 15 on the side facing the connecting ring 114. The square block 14 is slidably disposed in the corresponding arc-shaped groove 15. An arc-shaped rack 16 is provided between the ends of the two arc-shaped grooves 15 and is fixedly connected to the support base 111. The arc-shaped rack 16 meshes with the gear 13 for transmission.

[0037] Specifically, the sliding fit between the square block 14 and the arc groove 15 serves to limit and fix the guide plate 115. When the movable cylinder 7 drives the mixing component 11 to rotate, the guide plate 115 near the through hole 20 has the largest contact area with the water flow on its side, which can efficiently withstand the impact of the water flow and drive the rotating shaft 112 to rotate. As the mixing component 11 continues to rotate, the gears 13 at both ends of the guide plate 115 gradually mesh with the nearby arc rack 16, driving the guide plate 115 to rotate at a certain angle, so that the tangent of the guide plate 115 and the corresponding position of the connecting ring 114 are parallel. This structural design can significantly reduce the rotational resistance of the mixing component 11 in the liquid, avoid generating excessive radial turbulence and destroying the flocs. On the other hand, the guide plates 115 with multiple angle adjustments cooperate with each other to reduce the outward loss of liquid in the area of ​​the mixing component 11, prolong the mixing time of flocculant and wastewater, strengthen the mixing effect in the annular stirring area, and thus improve the flocculation reaction efficiency and uniformity, ensuring the quality of subsequent floc formation.

[0038] The arc of the arc-shaped groove 15 is precisely matched with the circumferential path of the square block 14 moving with the connecting ring 114. When the gear 13 meshes with the arc-shaped rack 16, the square block 14 is exactly in the gap between the two arc-shaped grooves 15. At this time, the gear 13 can smoothly drive the square block 14 to rotate synchronously. After the gear 13 disengages from the arc-shaped rack 16, the square block 14 will rotate 90° and accurately engage in the other arc-shaped groove 15, realizing the stable positioning of the guide plate 115 and ensuring the structural stability after angle adjustment. The rest of the structure is the same as that in Embodiment 1.

[0039] Example 3, referring to Figure 9 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that: multiple turbulence columns 17 are fixedly connected to the outer wall of the fixed cylinder 5. A turbulence ramp 18 is provided on the side of the turbulence column 17 that is in the same direction of rotation as the movable cylinder 7. The angles of the multiple turbulence ramps 18 are different.

[0040] Specifically, multiple turbulence columns 17 fixed to the outer wall of the fixed cylinder 5 have turbulence ramps 18 with different angles on the side that is in the same direction of rotation as the movable cylinder 7. This structure can effectively counteract the superposition effect of the circumferential flow field generated when the mixing component 11 rotates, and prevent the liquid in the annular stirring area from rotating synchronously with the mixing component 11, ensuring that the mixing component 11 forms efficient shearing and mixing of the liquid. At the same time, after the liquid flows through the turbulence ramps 18 at different angles, it will form wakes and eddies of different ranges, further breaking the uniformity of the flow field, promoting the deep diffusion and fusion of flocculant and wastewater, improving the mixing uniformity, providing a better hydraulic environment for the uniform formation of flocs, and thus improving the flocculation effect and solid-liquid separation efficiency.

[0041] Reference Figure 9 The turbulence column 17 has multiple inclined riser grooves 19, which rise in the direction of inclination along the rotation direction of the movable cylinder 7.

[0042] Specifically, when the liquid flows through the turbulence column 17, some of the liquid will generate upward flow force along the inclined trajectory of the riser trough 19. This riser effect can actively guide the liquid to converge into the fixed cylinder 5, which not only enhances the stability of the directional flow of the liquid, but also accelerates the delivery efficiency of the mixed liquid to the T-shaped diffusion area, providing continuous and stable hydraulic conditions for subsequent deep mixing and floc formation. The rest of the structure is the same as that in Example 2.

[0043] Based on embodiments 1-3, the working principle of this invention is as follows: After the liquid in the homogenization tank enters the flocculation tank 1, the motor 2 drives the movable cylinder 7 to rotate, and the guide plate 10 introduces the liquid at the edge of the flocculation tank 1 into the annular stirring area through the through hole 20. The external liquid supply equipment delivers flocculant to the annular pipe 61 through the liquid supply pipe 62 of the liquid supply pipeline 6, and sprays it evenly into the annular stirring area through multiple liquid outlet holes, making initial contact with the liquid. The flowing liquid impacts the guide plate 115, driving the rotating shaft 112 and the stirring blade 113 to rotate, realizing rapid and uniform mixing of flocculant and wastewater. After mixing, under the thrust of the stirring blade 113 and the liquid pressure, the liquid enters the T-shaped diffusion area along the upper port of the fixed cylinder 5. When flowing through the multi-layer grid plate 9, it forms turbulence through the gradient pores and differentiated channels, realizing deep secondary mixing and ensuring stable floc formation. The bottom plate 12 below the annular plate 4 guides the radial flow of the liquid, weakens the impact of the rotating flow field on the flocs, and finally disperses the liquid to the bottom edge of the flocculation tank 1, completing efficient solid-liquid separation, which meets the requirements of the "gradual flocculation" process.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A wastewater treatment device for the production of calcium-based hydrotalcite PVC composite heat stabilizers, comprising a flocculation tank (1), a motor (2), and a drive shaft (3), characterized in that, The flocculation tank (1) is provided with an annular plate (4), and a fixed cylinder (5) is fixedly connected to the top surface of the annular plate (4). Multiple grid plates (9) are axially arranged on the inner side of the fixed cylinder (5). A liquid addition pipe (6) is installed on the outer wall of the fixed cylinder (5). One end of the liquid addition pipe (6) is connected to an external liquid supply device. A movable cylinder (7) is provided on the outer side of the fixed cylinder (5). The top surface of the fixed cylinder (5) is lower than the top surface of the movable cylinder (7). The lower end of the drive shaft (3) drives the movable cylinder (7) to rotate. Multiple through holes (20) are opened in an annular pattern at equal intervals on the movable cylinder (7). A flow guide plate (10) is fixedly connected to the outer wall of the movable cylinder (7) near the through holes (20). A mixing component (11) is provided on the outer wall of the movable cylinder (7) near the through holes (20). The mixing component (11) mixes the liquid between the movable cylinder (7) and the fixed cylinder (5) and drives the liquid to flow into the fixed cylinder (5). The mixing component (11) includes two vertically distributed support bases (111), which are fixedly installed on the inner wall of the movable cylinder (7). A rotating shaft (112) is rotatably connected between the two support bases (111). Multiple stirring blades (113) are axially and equally spaced on the rotating shaft (112), and connecting rings (114) are fixedly connected to both ends of the rotating shaft (112). Multiple guide plates (115) are arranged in a ring and equally spaced between the two connecting rings (114).

2. The wastewater treatment equipment for the production of calcium-based hydrotalcite PVC composite heat stabilizer according to claim 1, characterized in that, The top surface of the movable cylinder (7) is fixedly connected to a connecting frame (8), and the lower end of the drive shaft (3) is fixedly connected to the connecting frame (8).

3. The wastewater treatment equipment for the production of calcium-based hydrotalcite PVC composite heat stabilizer according to claim 1, characterized in that, The liquid addition pipeline (6) includes an annular pipe (61) fixedly installed on the outer wall of the fixed cylinder (5). The annular pipe (61) has multiple liquid outlet holes with equal spacing in an annular shape. The annular pipe (61) is fixedly connected to a delivery pipe (62). The other end of the delivery pipe (62) passes under the annular plate (4) and extends to the outside of the flocculation tank (1).

4. The wastewater treatment equipment for the production of calcium-based hydrotalcite PVC composite heat stabilizers according to claim 1, characterized in that, The grid plate (9) includes an annular seat (91) that is fixed to the inner wall of the fixed cylinder (5). Multiple inclined plates (92) are fixedly connected inside the annular seat (91). The multiple inclined plates (92) are vertically crisscrossed, arranged in the same direction, and symmetrically arranged between two adjacent inclined plates (92).

5. The wastewater treatment equipment for the production of calcium-based hydrotalcite PVC composite heat stabilizer according to claim 1, characterized in that, The pore size of the multiple mesh plates (9) gradually increases from top to bottom.

6. The wastewater treatment equipment for the production of calcium-based hydrotalcite PVC composite heat stabilizer according to claim 1, characterized in that, Multiple base plates (12) are arranged in a ring at equal intervals below the annular plate (4). The base plates (12) are in the shape of an I-beam, and the upper and lower ends of the base plates (12) are respectively connected and fixed to the bottom surface of the annular plate (4) and the bottom surface of the flocculation tank (1).

7. The wastewater treatment equipment for the production of calcium-based hydrotalcite PVC composite heat stabilizers according to claim 1, characterized in that, Both ends of the guide plate (115) along its length are fixedly connected to a connecting shaft (116). The connecting shaft (116) is rotatably connected to the connecting ring (114). One end of the connecting shaft (116) passes through the connecting ring (114) and is sequentially fixedly connected to a gear (13) and a square block (14). The support base (111) has two arc-shaped grooves (15) on the side facing the connecting ring (114). The square block (14) is slidably disposed in the corresponding arc-shaped groove (15). An arc-shaped rack (16) is provided between the ends of the two arc-shaped grooves (15) and is fixedly connected to the support base (111). The arc-shaped rack (16) meshes with the gear (13) for transmission.

8. The wastewater treatment equipment for the production of calcium-based hydrotalcite PVC composite heat stabilizer according to claim 1, characterized in that, Multiple turbulence columns (17) are fixedly connected to the outer wall of the fixed cylinder (5). A turbulence ramp (18) is provided on the side of the turbulence column (17) that is in the same direction of rotation as the movable cylinder (7). The angles of the multiple turbulence ramps (18) are different.

9. The wastewater treatment equipment for the production of calcium-based hydrotalcite PVC composite heat stabilizer according to claim 8, characterized in that, The turbulence column (17) has multiple inclined riser grooves (19), and the riser grooves (19) rise in the direction of rotation of the movable cylinder (7).

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