A crystallization device for treating industrial wastewater

Abstract

The invention relates to a crystallization device for treating industrial wastewater, comprising a main tank body, wherein the main tank body comprises a main reaction zone, a secondary reaction zone and a separation sedimentation zone, a first partition is arranged between the main reaction zone and the secondary reaction zone, a second partition is arranged between the secondary reaction zone and the separation sedimentation zone, the top end of the second partition is connected to the top of the main tank body, and the bottom end is lower than the top end of the first partition, and the bottom end of the first partition is located at the lower part of the main tank body; both a water inlet pipe and a reagent pipe pass through the first partition to input wastewater and reagent; a discharge port is arranged at the bottom of the main tank body, and a water production port is arranged at the top of the separation sedimentation zone; a crystallization agitator is arranged in the main reaction zone, the crystallization agitator comprises a rotating shaft, a plurality of rotating bodies and a plurality of drug application components, the plurality of rotating bodies are evenly arranged along the length direction of the rotating shaft, a drug application component is arranged on the inner wall of the first partition, the drug application component is connected to the drug application component, when the rotating shaft drives the rotating body to rotate, it can pass through the drug application component of the corresponding height, so as to promote full contact between the wastewater and the reagent.

Description

Technical Field

[0001] The invention belongs to the technical field of induced crystallization treatment of industrial wastewater, and in particular relates to a crystallization device for treating industrial wastewater. Background Art

[0002] Pollutants such as metal ions such as calcium and magnesium, sulfate and phosphate in industrial wastewater are often treated by chemical precipitation. Chemical precipitation is a method of using chemical reagents to react with the ions to be removed in the wastewater to generate precipitates, which are then removed. Chemical precipitation has the characteristics of low cost and high speed. For example, lime water is added to wastewater containing sulfuric acid, and after mixed reaction, calcium sulfate precipitates are formed. The induced crystallization process is developed on the basis of chemical precipitation. It inherits the characteristics of high removal rate and high speed of chemical precipitation. It also has the characteristics of less secondary pollution and resource utilization of crystals after crystallization, thereby reducing the cost of wastewater treatment.

[0003] The precipitation products obtained by chemical methods are usually used in the fields of fertilizer production, construction, chemical industry, etc. However, in some fields, there are requirements for the parameters of the precipitate such as particle size and water content. Small particle size and / or high water content of the precipitate will affect its subsequent resource utilization and even require additional treatment as solid waste. Summary of the invention

[0004] In view of the above problems, the present invention provides a crystallization device for treating industrial wastewater, comprising a main tank body, the main tank body comprising a main reaction zone, a secondary reaction zone and a separation and sedimentation zone from the inside to the outside, a first partition plate is provided between the main reaction zone and the secondary reaction zone, and a second partition plate is provided between the secondary reaction zone and the separation and sedimentation zone;

[0005] The water inlet pipe and the reagent pipe both pass through the side wall and the first partition of the main tank body, and respectively input wastewater and reagent into the main reaction zone. The wastewater and reagent react in the main reaction zone to generate crystal precipitation, and the mixed fluid flows downward in the secondary reaction zone. The small-size crystals re-enter the main reaction zone to continue to react and grow, and the mixed fluid enters the separation sedimentation zone for solid-liquid separation. A discharge port is provided at the bottom of the main tank body for discharging the crystals obtained by solid-liquid separation, and a water outlet is provided at the top of the separation sedimentation zone.

[0006] A crystallization agitator is provided in the main reaction zone, and the crystallization agitator includes a rotating shaft, a plurality of rotating bodies and a plurality of dosing components. The plurality of rotating bodies are evenly arranged along the length direction of the rotating shaft. A plurality of dosing components are arranged on the inner wall of the first partition. The dosing components are connected to the drug pipes. When the rotating shaft drives the rotating body to rotate, it can pass through the dosing components of the corresponding height to promote full contact between the wastewater and the drug.

[0007] Optionally, the first baffle and the second baffle are both cylindrical, the first baffle surrounds the outside of the main reaction zone, and the second baffle surrounds the outside of the secondary reaction zone;

[0008] The top end of the second partition is connected to the top of the main tank body, and the bottom end is located in the middle of the main tank body; the top end of the first partition is located in the upper part of the main tank body, and the bottom end of the first partition is located in the lower part of the main tank body.

[0009] Optionally, the rotating shaft coincides with the central axis of the main tank body, and a plurality of dosing assemblies are evenly arranged along the circumference of the main reaction zone, that is, a plurality of dosing assemblies are spirally distributed along the inner wall of the first partition, and can dosing agents in all directions of the main reaction zone;

[0010] The top end of the rotating shaft passes through the main tank body and is connected to the motor above the main tank body. The rotating body includes a lower support plate and several layers of main mesh plates above the lower support plate. The bottom end of the main mesh plate is fixedly connected to the upper surface of the lower support plate, and the top end of the main mesh plate is suspended in the air. One rotating body corresponds to one pesticide application component, and the two have the same height.

[0011] Further optionally, the lower support sheet and the main mesh sheet are evenly and densely covered with through holes, the lower support sheet is circular and horizontally arranged, the main mesh sheet is vertically arranged, the inner side of the lower support sheet is fixedly connected to the rotating shaft, and the outer side points to the first partition, the lower support sheet is concentrically arranged with the main tank body, and a gap is left between the lower support sheet and the inner wall of the first partition;

[0012] Several layers of main mesh sheets are evenly arranged along the radial direction of the main tank body. The main mesh sheets are cylindrical and all have the central axis of the main tank body as the center of the circle.

[0013] Further optionally, the side of the main mesh facing the rotating shaft is the inner side, and the side facing the first partition is the outer side, and the inner side and the outer side of the main mesh are evenly arranged with a plurality of circles of stirring components from top to bottom, each circle of the stirring components includes a plurality of stirring parts, and the plurality of stirring parts are evenly arranged along the circumference of the corresponding main mesh;

[0014] The height of a circle of stirring components on the inner side surface of the main mesh sheet is the same as that of a circle of stirring components on the outer side surface, and the stirring parts of the two circles of stirring components correspond to each other one by one.

[0015] Further optionally, the stirring part includes a stirring shaft and blades, the stirring shaft passes through the main mesh, the two stirring parts corresponding to the inner side and the outer side of the main mesh share a stirring shaft, the stirring shaft is perpendicular to the main mesh, and the midpoint of the stirring shaft is rotatably connected to the main mesh;

[0016] A blade is arranged on both sides of the part of the stirring shaft located inside the main mesh, and a blade is also arranged on both sides of the part of the stirring shaft located outside the main mesh, so that when the rotating shaft drives the main mesh to rotate, the blades rotate around the stirring shaft as the axis under the action of liquid flow.

[0017] Optionally, the drug application assembly includes an upper support sheet and several layers of auxiliary mesh sheets below the upper support sheet, the upper support sheet and the auxiliary mesh sheets are evenly and densely covered with through holes, the upper support sheet is arranged horizontally, the auxiliary mesh sheets are arranged vertically, the top end of the auxiliary mesh sheets is fixedly connected to the lower surface of the upper support sheet, and the bottom end is suspended;

[0018] The upper support piece is fan-shaped, the outer side of the upper support piece is fixedly connected to the inner wall of the first partition, and the other side points to the rotation axis, and a gap is left between the upper support piece and the rotation axis so as not to affect the rotation of the rotation axis;

[0019] Several layers of auxiliary mesh sheets are evenly arranged along the radial direction of the main tank body, the auxiliary mesh sheets are arc-shaped, and the auxiliary mesh sheets, the upper supporting sheets and the main tank body are arranged concentrically.

[0020] Further optionally, a medicine dispensing tube is provided on the lower surface of the upper support plate, one end of the medicine dispensing tube is closed, and the other end is connected to the medicine tube, and a plurality of medicine dispensing ports are evenly arranged on the lower surface of the medicine dispensing tube, and the medicine input into the medicine tube is output to between each auxiliary mesh plate, and the medicine dispensing tube is arranged along the radial direction of the main tank body.

[0021] Optionally, the bottom of the rotating shaft is connected to a plurality of support rods, which are evenly arranged along the circumference of the main tank body. The other end of the support rods is connected to the bottom of the rotating slide. The rotating slide is inclined and surrounds the outer side of the second partition. The top of the rotating slide is closer to the second partition than the bottom. The rotating slide can rotate with the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of a crystallization device for treating industrial wastewater;

[0023] Figure 2 is a schematic diagram of a crystallization agitator;

[0024] Figure 3 is a top view schematic diagram of a rotating body;

[0025] Figure 4 This is a schematic diagram of the cooperation between the rotating slide plate and the first partition plate and the second partition plate (the crystallization agitator is omitted).

[0026] In the accompanying drawings, 1-main tank body, 2-main reaction zone, 3-auxiliary reaction zone, 4-separation and sedimentation zone, 5-first partition, 6-second partition, 7-water inlet pipe, 8-drug pipe, 9-rotating body, 10-rotating shaft, 11-lower support plate, 12-upper support plate, 13-main mesh, 14-auxiliary mesh, 15-stirring part, 16-stirring shaft, 17-drug distribution pipe, 18-support rod, 19-rotating slide plate, 20-propulsion stirring paddle. DETAILED DESCRIPTION

[0027] This embodiment provides a crystallization device for treating industrial wastewater, such as Figure 1-Figure 4As shown, it comprises a main tank body 1, which comprises a main reaction zone 2, a secondary reaction zone 3 and a separation and sedimentation zone 4 from the inside to the outside, a first baffle 5 is provided between the main reaction zone 2 and the secondary reaction zone 3, and a second baffle 6 is provided between the secondary reaction zone 3 and the separation and sedimentation zone 4;

[0028] The water inlet pipe 7 and the reagent pipe 8 both pass through the side wall of the main tank body 1 and the first partition plate 5, and respectively input wastewater and reagent into the main reaction zone 2. The wastewater and the reagent react in the main reaction zone 2 to generate crystal precipitation. The mixed fluid flows downward in the secondary reaction zone 3 to continue to react. The crystals continue to grow. The mixed fluid enters the separation sedimentation zone 4 for solid-liquid separation. The bottom of the main tank body 1 is provided with a discharge port for discharging the crystals obtained by solid-liquid separation. The top of the separation sedimentation zone 4 is provided with a water production port.

[0029] A crystallization agitator is provided in the main reaction zone 2, and the crystallization agitator includes a rotating shaft 10, a plurality of rotating bodies 9 and a plurality of dosing components. The plurality of rotating bodies 9 are evenly arranged along the length direction of the rotating shaft 10, and a plurality of dosing components are arranged on the inner wall of the first partition plate 5. The drug tube 8 is connected to the dosing components. When the rotating shaft 10 drives the rotating body to rotate, it can pass through the dosing components of the corresponding height to promote full contact between the wastewater and the drug.

[0030] Optionally, the upper portion of the main tank body 1 is a cylinder, which provides a larger space for chemical reactions and solid-liquid separation, and the lower portion of the main tank body 1 is an inverted cone, which is convenient for discharging crystalline solids.

[0031] Optionally, the first partition plate 5 and the second partition plate 6 are both cylinders, the first partition plate 5 surrounds the outside of the main reaction zone 2, and the second partition plate 6 surrounds the outside of the secondary reaction zone 3; the top end of the second partition plate 6 is connected to the top of the main tank body 1, and the bottom end is in the middle of the main tank body 1, and the second partition plate 6 is fixed in the main tank body 1 by its own top end; the top end of the first partition plate 5 is in the upper part of the main tank body 1, the bottom end of the second partition plate 6 is lower than the top end of the first partition plate 5, and the bottom end of the first partition plate 5 is in the lower part of the main tank body 1, the top and bottom ends of the first partition plate 5 are suspended, and the outer side is connected to the inner wall of the second partition plate 6 by a connecting rod to fix the first partition plate 5.

[0032] Optionally, the rotating shaft 10 coincides with the central axis of the main tank body 1, and a plurality of dosing assemblies are evenly arranged along the circumference of the main reaction zone 2, that is, a plurality of dosing assemblies are spirally distributed along the inner wall of the first partition, and can add agents to all directions of the main reaction zone 2;

[0033] The top end of the rotating shaft 10 passes through the main tank body 1 and is connected to the motor above the main tank body 1. The rotating body includes a lower support plate 11 and several layers of main mesh 13 above the lower support plate. The bottom end of the main mesh 13 is fixedly connected to the upper surface of the lower support plate 11, and the top end of the main mesh 13 is suspended in the air; one rotating body corresponds to one pesticide application component, and the two have the same height.

[0034] Further optionally, the lower support sheet 11 and the main mesh sheet 13 are evenly and densely covered with through holes, the lower support sheet 11 is circular and horizontally arranged, the main mesh sheet 13 is vertically arranged, the inner side of the lower support sheet 11 is fixedly connected to the rotating shaft 10, and the outer side points to the first partition 5, the lower support sheet 11 is concentrically arranged with the main tank body 1, and a gap is left between the lower support sheet 11 and the inner wall of the first partition 5;

[0035] Several layers of main mesh sheets 13 are evenly arranged along the radial direction of the main tank body 1 . The main mesh sheets 13 are cylindrical and all have the central axis of the main tank body 1 as the center.

[0036] Further optionally, the top end of the rotating shaft 10 passes through the main tank body and is then connected to the motor above the main tank body, and the bottom end of the rotating shaft 10 exceeds the bottom end of the first partition 5.

[0037] Further optionally, the side of the main mesh facing the rotating shaft 10 is the inner side, and the side facing the first partition plate 5 is the outer side, and the inner side and the outer side of the main mesh are evenly arranged with a plurality of circles of stirring components from top to bottom, each circle of the stirring components includes a plurality of stirring parts, and the plurality of stirring parts are evenly arranged along the circumference of the corresponding main mesh;

[0038] The height of a circle of stirring components on the inner side surface of the main mesh sheet is the same as that of a circle of stirring components on the outer side surface, and the stirring parts of the two circles of stirring components correspond to each other one by one.

[0039] Further optionally, the stirring part 15 includes a stirring shaft 16 and blades, the stirring shaft 16 passes through the main mesh 13, the two stirring parts corresponding to the inner side and the outer side of the main mesh 13 share a stirring shaft 16, the stirring shaft 16 is perpendicular to the main mesh, and the midpoint of the stirring shaft 16 is rotatably connected to the main mesh;

[0040] A blade is provided on both sides of the part of the stirring shaft inside the main mesh, and a blade is provided on both sides of the part of the stirring shaft outside the main mesh, so that when the rotating shaft 10 drives the main mesh to rotate, the blades rotate with the stirring shaft as the axis under the action of the liquid flow. The blades are perpendicular to the main mesh and also perpendicular to the stirring shaft.

[0041] Since the space occupied by a circle of stirring components on the inner side of the main mesh is smaller than the space occupied by a circle of stirring components corresponding to the outer side, the number and size of the stirring parts of the stirring components on the inner side of the main mesh should be reasonably configured according to the size of the inner diameter of the main mesh. The number of stirring parts in all stirring components above and below the same main mesh is the same. The lengths of the stirring parts on the same main mesh are equal (the length of the stirring part is equal to half the length of the corresponding stirring shaft). In the two adjacent layers of main meshes inside and outside, the stirring part on the inner side of the outer main mesh does not contact the stirring part on the outer side of the inner main mesh, and the sum of the length of a single stirring part on the inner side of the outer main mesh and the length of a single stirring part on the outer side of the inner main mesh is less than the distance between the main meshes on both sides. The stirring part is a small stirring device with a small blade size. The size of the stirring part and the blades are reasonably designed according to the distance between the main mesh and the adjacent auxiliary meshes on both sides.

[0042] Optionally, the drug application assembly includes an upper support sheet 12 and several layers of auxiliary mesh sheets 14 below the upper support sheet 12, the upper support sheet 12 and the auxiliary mesh sheets 14 are evenly and densely covered with through holes, the upper support sheet is horizontally arranged, the auxiliary mesh sheets are vertically arranged, the top end of the auxiliary mesh sheets is fixedly connected to the lower surface of the upper support sheet, and the bottom end is suspended;

[0043] The upper support piece is fan-shaped, the outer side of the upper support piece is fixedly connected to the inner wall of the first partition 5, and the other side points to the rotating shaft 10, and there is a gap between the rotating shaft 10 so as not to affect the rotation of the rotating shaft;

[0044] Several layers of auxiliary mesh sheets are evenly arranged along the radial direction of the main tank body 1 . The auxiliary mesh sheets are arc-shaped. The auxiliary mesh sheets and the upper support sheet are concentrically arranged with the main tank body 1 .

[0045] Further optionally, a medicine dispensing tube 17 is provided on the lower surface of the upper support plate, one end of the medicine dispensing tube 17 is closed, and the other end is connected to the medicine tube 8, and a plurality of medicine dispensing ports are evenly arranged on the lower surface of the medicine dispensing tube 17, and the medicine input into the medicine tube is output to between each auxiliary mesh plate, and the medicine dispensing tube is arranged along the radial direction of the main tank body 1.

[0046] The water inlet pipe 7 is connected to the middle and lower part of the first partition 5 to input wastewater into the main reaction zone 2. The motor drives several rotating bodies to rotate through the rotating shaft 10, and the dosing assembly does not affect the rotation of the rotating shaft 10 and the rotating body. One rotating body corresponds to one dosing assembly, the upper support sheet of the dosing assembly is on the top, and the lower support sheet of the rotating body is on the bottom. The lower support sheet is between the bottom end of the auxiliary mesh sheet above and the upper support sheet below, without any obstruction, and can rotate normally; the upper support sheet is between the lower support sheet above and the top end of the main mesh sheet below, and does not hinder the rotation of the rotating body.

[0047] During rotation, a main mesh sheet turns into the space between two adjacent auxiliary mesh sheets. The auxiliary mesh sheets are arc-shaped. The space between the two adjacent auxiliary mesh sheets forms a track space, allowing the main mesh sheet to pass through. The stirring parts on both sides of the main mesh sheet occupy the space between the main mesh sheet and the auxiliary mesh sheet, stirring the wastewater in the space, forming a form in which the main mesh sheet and the auxiliary mesh sheet are alternately arranged, and a stirring part is also provided between the main mesh sheet and the auxiliary mesh sheet. The medicine dispensing pipe of the upper support sheet runs through each auxiliary mesh sheet to input the medicine between adjacent auxiliary mesh sheets. The stirring part can stir the medicine and wastewater at the first time to promote the full mixing of the two and promote the reaction. Since the main mesh sheet is circular, the main mesh sheet always passes through the inside of the medicine dispensing component, and the stirring part always has the stirring effect, so that the newly input medicine is mixed with the wastewater in time, and as the main mesh sheet rotates, the medicine is driven to other areas with low medicine concentration in the horizontal direction, reducing the medicine concentration gradient at the same height and promoting the uniform distribution of the medicine. The dosing components on the first partition are distributed in a spiral shape, and can provide reagents to the main reaction zone 2 at various heights.

[0048] The mesh design of the crystallization agitator allows small crystals to adhere to the mesh when wastewater and reagents are stirred, and continue to grow by attaching to the grains as crystal nuclei. When the crystals grow to a certain weight, they will fall off automatically.

[0049] The main mesh, the auxiliary mesh, the upper support plate and the lower support plate all allow the fluid to pass freely, without affecting the larger crystals sinking to the bottom of the main tank 1, nor affecting the smaller crystals rising with the water flow and then entering the secondary reaction zone 3 to continue the reaction and crystallization and crystal growth.

[0050] Although the top of the first partition 5 does not touch the top plate of the main tank body 1, the space inside the first partition 5 and the space directly above the space until the top plate of the main tank body 1 are the main reaction zone 2. The upper part of the main reaction zone 2 is connected to the upper part of the secondary reaction zone 3 on the outside to form a connected space. The layout range of the rotating body can be higher than the top of the first partition 5. The specific layout height is adjusted according to the actual wastewater and crystallization requirements. The wastewater and the reagent are mixed evenly under the stirring action of the crystallization agitator, and the water body entrains small particles of crystals and rises. After surpassing the first partition 5, a lateral flow is generated in the above-mentioned connected space. Then it flows downward along the second partition 6 in the secondary reaction zone 3 to promote crystal precipitation. Finally, the water body enters the separation and sedimentation zone 4 for final solid-liquid separation, and the produced water is discharged from the water production port at the top. The bottom of the main tank body 1 receives the crystals falling from the main reaction zone 2, the secondary reaction zone 3, and the separation and sedimentation zone 4, and then discharges them through the discharge port.

[0051] Optionally, the bottom of the rotating shaft 10 is connected to a plurality of support rods 18, and the plurality of support rods 18 are evenly arranged along the circumference of the main tank body 1. The other end of the support rods 18 is connected to the bottom of a rotating slide 19. The rotating slide 19 is inclined and surrounds the outer side of the second partition 6. The top of the rotating slide is closer to the second partition 6 than the bottom. The rotating slide as a whole is between the second partition 6 and the inner wall of the main tank body 1, and can rotate with the rotating shaft 10 to stir the water in the separation sedimentation zone 4. Under the action of centrifugal force, solid-liquid separation is promoted, and the crystalline solid can also slide downward along the inner and outer surfaces of the rotating slide.

[0052] Optionally, the crystallization device also includes a feed pipe, which passes through the side wall of the main tank body and the first partition and extends into the main reaction zone, and is used to add crystal seeds into the main reaction zone. The part of the feed pipe in the main reaction zone is inclined downward to avoid blockage of the feed pipe.

[0053] Optionally, a propulsion stirring paddle 20 is further provided on the rotating shaft. The propulsion stirring paddle is higher than the bottom end of the first partition. The stirring range of the propulsion stirring paddle is within the inner diameter range of the first partition, providing upward lift for the main reaction zone.

Claims

1. A crystallization device for treating industrial wastewater, characterized in that: The main tank body includes a main reaction zone, a secondary reaction zone and a separation and sedimentation zone from the inside to the outside, a first partition plate is arranged between the main reaction zone and the secondary reaction zone, and a second partition plate is arranged between the secondary reaction zone and the separation and sedimentation zone; The water inlet pipe and the reagent pipe both pass through the side wall of the main tank body and the first partition plate to input wastewater and reagents into the main reaction zone respectively; a discharge port is provided at the bottom of the main tank body to discharge the crystals obtained by solid-liquid separation, and a water outlet is provided at the top of the separation sedimentation zone; A crystallization agitator is provided in the main reaction zone, and the crystallization agitator includes a rotating shaft, a plurality of rotating bodies and a plurality of dosing assemblies. The plurality of rotating bodies are evenly arranged along the length direction of the rotating shaft. A plurality of dosing assemblies are arranged on the inner wall of the first partition plate. The dosing assemblies are connected to the dosing assemblies by the dosing pipes. When the rotating shaft drives the rotating body to rotate, the dosing assemblies at the corresponding height can be passed through, so as to promote full contact between the wastewater and the agent. The rotating shaft coincides with the central axis of the main tank body, and a plurality of dosing assemblies are evenly arranged along the circumference of the main reaction zone, that is, a plurality of dosing assemblies are spirally distributed along the inner wall of the first partition, and can add agents in all directions of the main reaction zone; The top end of the rotating shaft passes through the main tank body and is connected to the motor above the main tank body. The rotating body includes a lower support sheet and several layers of main mesh sheets above the lower support sheet. The bottom end of the main mesh sheet is fixedly connected to the upper surface of the lower support sheet, and the top end of the main mesh sheet is suspended in the air. One rotating body corresponds to one pesticide application component, and the two have the same height. The lower support sheet and the main mesh sheet are evenly and densely covered with through holes. The lower support sheet is circular and horizontally arranged, and the main mesh sheet is vertically arranged. The inner side of the lower support sheet is fixedly connected to the rotating shaft, and the outer side points to the first partition. The lower support sheet is concentrically arranged with the main tank body. Several layers of main mesh sheets are evenly arranged along the radial direction of the main tank body. The main mesh sheets are cylindrical and all have the central axis of the main tank body as the center of the circle. The side of the main mesh facing the rotating shaft is the inner side, and the side facing the first partition is the outer side. The inner side and the outer side of the main mesh are evenly arranged with a plurality of stirring components from top to bottom, each stirring component includes a plurality of stirring parts, and the plurality of stirring parts are evenly arranged along the circumference of the corresponding main mesh; The height of a circle of stirring components on the inner side of the main mesh is the same as that of a circle of stirring components on the outer side, and the stirring parts of the two circles of stirring components correspond to each other. The spraying assembly comprises an upper support sheet and several layers of auxiliary mesh sheets below the upper support sheet, the upper support sheet and the auxiliary mesh sheets are evenly and densely covered with through holes, the upper support sheet is arranged horizontally, and the auxiliary mesh sheets are arranged vertically; the top end of the auxiliary mesh sheets is fixedly connected to the lower surface of the upper support sheet, and the bottom end is suspended; The upper support piece is fan-shaped, the outer side of the upper support piece is fixedly connected to the inner wall of the first partition, and the other side points to the rotation axis, and a gap is left between the upper support piece and the rotation axis so as not to affect the rotation of the rotation axis; Several layers of auxiliary mesh sheets are evenly arranged along the radial direction of the main tank body, the auxiliary mesh sheets are arc-shaped, and the auxiliary mesh sheets, the upper supporting sheets and the main tank body are arranged concentrically.

2. The crystallization device for treating industrial wastewater according to claim 1, characterized in that: The first baffle and the second baffle are both cylindrical, the first baffle surrounds the outside of the main reaction zone, and the second baffle surrounds the outside of the secondary reaction zone; The top end of the second partition is connected to the top of the main tank body, and the bottom end is located in the middle of the main tank body; the top end of the first partition is located in the upper part of the main tank body, and the bottom end of the first partition is located in the lower part of the main tank body.

3. The crystallization device for treating industrial wastewater according to claim 1, characterized in that: The stirring part includes a stirring shaft and blades, the stirring shaft passes through the main mesh, the two stirring parts corresponding to the inner side and the outer side of the main mesh share a stirring shaft, the stirring shaft is perpendicular to the main mesh, and the midpoint of the stirring shaft is rotatably connected to the main mesh; A blade is arranged on both sides of the part of the stirring shaft located inside the main mesh, and a blade is also arranged on both sides of the part of the stirring shaft located outside the main mesh, so that when the rotating shaft drives the main mesh to rotate, the blades rotate around the stirring shaft as the axis under the action of liquid flow.

4. The crystallization device for treating industrial wastewater according to claim 1, characterized in that: A medicine dispensing tube is provided on the lower surface of the upper support plate, one end of the medicine dispensing tube is closed, and the other end is connected to the medicine tube. A plurality of medicine dispensing ports are evenly arranged on the lower surface of the medicine dispensing tube, and the medicine input into the medicine tube is output to between each auxiliary mesh plate. The medicine dispensing tube is arranged along the radial direction of the main tank body.

5. The crystallization device for treating industrial wastewater according to claim 1, characterized in that: The crystallization device also includes a material delivery pipe, which passes through the side wall of the main tank body and the first partition plate and extends into the main reaction zone, and is used for adding crystal seeds into the main reaction zone.

6. The crystallization device for treating industrial wastewater according to claim 1, characterized in that: The bottom of the rotating shaft is connected to a plurality of support rods, which are evenly arranged along the circumference of the main tank body, and the other ends of the support rods are connected to the bottom of the rotating slide plate; The rotating slide plate is inclined and circles around the outer side of the second partition plate. The top of the rotating slide plate is closer to the second partition plate than the bottom. The rotating slide plate can rotate along with the rotating shaft.

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