Magnetic flocculation high-density sedimentation tank equipment

Abstract

According to the magnetic flocculation high-density sedimentation tank equipment, one side of the upper part of a first reaction tank is connected with a raw water conveying pipeline, and the bottom of the first reaction tank is communicated with the bottom of a second reaction tank; the first aeration coil pipe is arranged at the bottom of the inner side of the second reaction tank; the first reaction tank is used for carrying out a coagulation reaction on received raw water, and the second reaction tank is used for softening a received material subjected to the coagulation reaction in the first reaction tank; the upper part of the flocculation tank is communicated with the upper part of the second reaction tank, the second aeration coil pipe is arranged at the bottom of the inner side of the flocculation tank, and the guide cylinder is fixed at the bottom of the inner side of the flocculation tank; the flocculation tank is used for performing magnetic separation and flocculation on the received materials softened by the second reaction tank; the upper part of the sedimentation tank is communicated with the upper part of the flocculation tank, an inclined pipe is arranged in the sedimentation tank, and the third aeration coil pipe is arranged at the bottom of the inclined pipe; and the sedimentation tank is used for precipitating the received material which is magnetically separated and flocculated by the flocculation tank. The utility model is not easy to block and has strong operation reliability.

Description

Technical Field

[0001] The utility model relates to magnetic flocculation high-density sedimentation tank equipment, belonging to the technical field of water treatment. Background Art

[0002] High-density sedimentation tank (abbreviated as high-density tank) is a structure that integrates mixing, reaction, sedimentation, concentration and external sludge circulation. Compared with traditional sedimentation methods, high-density sedimentation tank increases the continuous external sludge return from the sludge concentration area to the reaction area, so that the sludge concentration reaches a maximum value. It has the advantages of high treatment efficiency and good impact resistance. At the same time, it can produce sludge with higher concentration, which can be filtered without re-concentration. This technology is widely used in processes such as turbidity removal, chemical hardness removal, chemical silicon removal, and alkalinity reduction. It is one of the primary considerations in modern water treatment processes.

[0003] At present, there is a problem of dead corners in the reaction tank and flocculation tank of the high-density tank, that is, the generated sludge will be deposited in the four corners of the tank, resulting in clogging in the tank, affecting the operation, sedimentation effect and sludge discharge effect, etc. In the full softening process, the precipitation density of the produced magnesium hydroxide is small and the precipitation time is long. The addition of magnetic powder in the flocculation process makes the magnetic powder wrapped in the flocs. Although it can greatly increase the specific gravity of flocs such as magnesium hydroxide, reduce the precipitation time, and improve the processing capacity of the high-density tank, the added magnetic powder is more likely to accumulate in the reaction tank and flocculation tank, affecting the normal operation of the system. Utility Model Content

[0004] The utility model aims at the deficiencies in the prior art and provides a magnetic flocculation high-density sedimentation tank device to solve the problems that the high-density tank of the traditional technology is easy to be blocked during operation and the deposition of magnetic powder will seriously affect the normal operation of the system.

[0005] The utility model solves the above technical problems with the following technical solutions: A magnetic flocculation high-density sedimentation tank equipment, comprising a first reaction tank, a second reaction tank, a first aeration coil, a flocculation tank, a second aeration coil, a guide tube, a sedimentation tank and a third aeration coil;

[0006] A raw water delivery pipeline is connected to one side of the upper part of the first reaction tank, and the bottom of the first reaction tank is connected to the bottom of the second reaction tank; the first aeration coil is arranged at the inner bottom of the second reaction tank; the first reaction tank is used to perform a coagulation reaction on the received raw water, and the second reaction tank is used to soften the material received after the coagulation reaction in the first reaction tank;

[0007] The upper part of the flocculation tank is connected to the upper part of the second reaction tank, the second aeration coil is arranged at the inner bottom of the flocculation tank, and the guide tube is fixed at the inner bottom of the flocculation tank; the flocculation tank is used to perform magnetic separation and flocculation on the softened material received in the second reaction tank;

[0008] The upper part of the sedimentation tank is connected to the upper part of the flocculation tank, an inclined pipe is arranged inside the sedimentation tank, and the third aeration coil is arranged at the bottom of the inclined pipe; the sedimentation tank is used to precipitate the material received after magnetic separation and flocculation in the flocculation tank.

[0009] As a preferred solution of the magnetic flocculation high-density sedimentation tank equipment, the first aeration coil is connected to a first compressed air branch, and the first compressed air branch is provided with a first control valve; the second aeration coil is connected to a second compressed air branch, and the second compressed air branch is provided with a second control valve; the third aeration coil is connected to a third compressed air branch, and the third compressed air branch is provided with a third control valve;

[0010] The first compressed air branch, the second compressed air branch, and the third compressed air branch are commonly connected to a compressed air delivery main pipeline.

[0011] As a preferred solution for the magnetic flocculation high-density sedimentation tank equipment, the first aeration coil is distributed in a ring shape at the bottom of the second reaction tank; the second aeration coil is distributed in a ring shape at the bottom of the flocculation tank.

[0012] As a preferred solution for the magnetic flocculation high-density sedimentation tank equipment, the third aeration coil forms a plurality of partitions below the inclined tube, the third aeration coil of each partition is connected to a third compressed air branch, and each third compressed air branch is connected to a third control valve.

[0013] As a preferred solution of the magnetic flocculation high-density sedimentation tank equipment, the guide tube includes a support frame, a cylinder and a fixing plate; the side of the cylinder is connected to the support frame, and the bottom of the support frame is connected to the bottom of the flocculation tank; the fixing plate is connected between the inner wall of the flocculation tank and the outer wall of the cylinder;

[0014] The upper end of the cylinder is connected with a trumpet-shaped flow guide port; the lower part of the cylinder is formed with a through port.

[0015] As a preferred solution of the magnetic flocculation high-density sedimentation tank equipment, a sludge return pipeline is connected to the bottom of the sedimentation tank, and the sludge return pipeline is connected to the second reaction tank.

[0016] As a preferred embodiment of the magnetic flocculation high-density sedimentation tank equipment, it also includes a magnetic separation system, a magnetic powder separation pipeline is connected between the magnetic separation system and the sludge return pipeline, and a magnetic powder return pipeline is connected between the magnetic separation system and the second reaction tank.

[0017] As a preferred solution for the magnetic flocculation high-density sedimentation tank equipment, the magnetic separation system is connected to a sludge discharge pipeline.

[0018] The beneficial effects of the utility model are as follows: a first reaction tank, a second reaction tank, a first aeration coil, a flocculation tank, a second aeration coil, a guide tube, a sedimentation tank and a third aeration coil are provided; a raw water delivery pipeline is connected to one side of the upper part of the first reaction tank, and the bottom of the first reaction tank is connected to the bottom of the second reaction tank; the first aeration coil is arranged at the inner bottom of the second reaction tank; the first reaction tank is used to perform a coagulation reaction on the received raw water, and the second reaction tank is used to soften the material received in the first reaction tank after the coagulation reaction; the upper part of the flocculation tank and the upper part of the second reaction tank are connected, the second aeration coil is arranged at the inner bottom of the flocculation tank, and the guide tube is fixed at the inner bottom of the flocculation tank; the flocculation tank is used to perform magnetic separation and flocculation on the material received in the second reaction tank after softening; the upper part of the sedimentation tank and the upper part of the flocculation tank are connected, an inclined tube is arranged inside the sedimentation tank, and the third aeration coil is arranged at the bottom of the inclined tube; the sedimentation tank is used to precipitate the material received in the flocculation tank after magnetic separation and flocculation. The utility model is designed without push flow area, which reduces sludge deposition and facilitates construction; the design of the guide tube ensures stable flow state and unchanged flocculation effect; the aeration design reduces the number of maintenance times and labor, ensuring long-term stable operation of the high-density pool; the inclined tube aeration of the sedimentation tank realizes automatic flushing under the premise of ensuring the flushing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0021] Figure 1This is a schematic diagram of the structure of a magnetic flocculation high-density sedimentation tank device provided in an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of a guide tube of a magnetic flocculation high-density sedimentation tank device provided in an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the civil construction distribution of the magnetic flocculation high-density sedimentation tank equipment provided in an embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the steel distribution of the magnetic flocculation high-density sedimentation tank equipment provided in an embodiment of the utility model.

[0025] In the figure, 1, the first reaction tank; 2, the second reaction tank; 3, the first aeration coil; 4, the flocculation tank; 5, the second aeration coil; 6, the guide tube; 7, the sedimentation tank; 8, the third aeration coil; 9, the raw water delivery pipeline; 10, the first compressed air branch; 11, the first control valve; 12, the second compressed air branch; 13, the second control valve; 14, the third compressed air branch; 15, the third control valve; 16, the compressed air delivery main pipeline; 17, the support frame; 18, the cylinder; 19, the fixing plate; 20, the guide port; 21, the through port; 22, the sludge return pipeline; 23, the magnetic separation system; 24, the magnetic powder separation pipeline; 25, the magnetic powder return pipeline; 26, the sludge discharge pipeline. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] See also Figure 1 and Figure 2The utility model embodiment provides a magnetic flocculation high-density sedimentation tank 7 device, including a first reaction tank 1, a second reaction tank 2, a first aeration coil 3, a flocculation tank 4, a second aeration coil 5, a guide tube 6, a sedimentation tank 7 and a third aeration coil 8;

[0029] Among them, a raw water delivery pipeline 9 is connected to one side of the upper part of the first reaction tank 1, and the bottom of the first reaction tank 1 and the bottom of the second reaction tank 2 are connected; the first aeration coil 3 is arranged at the inner bottom of the second reaction tank 2; the first reaction tank 1 is used to perform a coagulation reaction on the received raw water, and the second reaction tank 2 is used to soften the material received after the coagulation reaction of the first reaction tank 1;

[0030] The upper part of the flocculation tank 4 is connected to the upper part of the second reaction tank 2, the second aeration coil 5 is arranged at the inner bottom of the flocculation tank 4, and the guide tube 6 is fixed at the inner bottom of the flocculation tank 4; the flocculation tank 4 is used to perform magnetic separation and flocculation on the softened material received from the second reaction tank 2;

[0031] The upper part of the sedimentation tank 7 is connected to the upper part of the flocculation tank 4, an inclined pipe is arranged inside the sedimentation tank 7, and the third aeration coil 8 is arranged at the bottom of the inclined pipe; the sedimentation tank 7 is used to precipitate the material received after magnetic separation and flocculation in the flocculation tank 4.

[0032] In this embodiment, the first aeration coil 3 is connected to the first compressed air branch 10, and the first compressed air branch 10 is provided with a first control valve 11; the second aeration coil 5 is connected to the second compressed air branch 12, and the second compressed air branch 12 is provided with a second control valve 13; the third aeration coil 8 is connected to the third compressed air branch 14, and the third compressed air branch 14 is provided with a third control valve 15; the first compressed air branch 10, the second compressed air branch 12, and the third compressed air branch 14 are connected to a compressed air delivery main pipeline 16. Among them, the first aeration coil 3 is distributed in an annular shape at the bottom of the second reaction tank 2; the second aeration coil 5 is distributed in an annular shape at the bottom of the flocculation tank 4.

[0033] Specifically, since the second reaction tank 2 is prone to accumulate magnetic powder when a large amount of magnetic powder refluxes, compressed air can be input to the first aeration coil 3 through the compressed air delivery main pipeline 16 and the first compressed air branch 10, and the first aeration coil 3 outputs compressed air to the second reaction tank 2 to avoid magnetic powder deposition at the bottom of the second reaction tank 2, and the first control valve 11 realizes the on-off control of the first compressed air branch 10. At the same time, compressed air can be input to the second aeration coil 5 through the compressed air delivery main pipeline 16 and the second compressed air branch 12 to prevent sludge blockage in the flocculation tank 4, and the second control valve 13 realizes the on-off control of the second compressed air branch 12.

[0034] The third aeration coil 8 has several partitions formed below the inclined tube, and each partition of the third aeration coil 8 is connected to a third compressed air branch 14 , and each third compressed air branch 14 is connected to a third control valve 15 .

[0035] Specifically, compressed air can be input to the third aeration coil 8 through the compressed air delivery main pipeline 16 and the third compressed air branch 14 to prevent sludge blockage in the sedimentation tank 7, and the third control valve 15 realizes the on-off control of the third compressed air branch 14. Among them, the third aeration coil 8 adopts a zoning design, and the opening interval and opening time of the third control valve 15 are controlled by program to realize automatic aeration and flushing to prevent sludge blockage, and aeration can be performed in turn in different areas to reduce the impact on instantaneous water quality.

[0036] See also Figure 2 In this embodiment, the guide tube 6 includes a support frame 17, a cylinder 18 and a fixing plate 19; the side of the cylinder 18 is connected to the support frame 17, and the bottom of the support frame 17 is connected to the bottom of the flocculation tank 4; the fixing plate 19 is connected between the inner wall of the flocculation tank 4 and the outer wall of the cylinder 18; the upper end of the cylinder 18 is connected with a trumpet-shaped guide port 20; and the lower part of the cylinder 18 is formed with a through port 21.

[0037] In the design of the high-density tank, in order to stabilize the flow state and ensure the sedimentation effect, a plug flow area is generally set between the flocculation tank 4 and the sedimentation tank 7. The process section that requires full softening is generally after the membrane concentration. At this time, the water volume is small and the width of the plug flow area is small. Not only is the magnetic powder easy to deposit, but the anti-corrosion construction is also inconvenient. This embodiment cancels the design of the plug flow area. At the same time, in order to ensure that the effluent of the flocculation tank 4 will not impact the sludge of the sedimentation tank 7, the flocculation tank 4 is changed to an upper outlet, and the guide tube 6 is changed to an upper inlet. The flow state in the flocculation tank 4 is as follows: Figure 1 To prevent short-circuiting, the guide tube 6 is supported and raised so that the water from the second reaction pool 2 can enter the guide tube 6 stably.

[0038] The mixed materials in the second reaction tank 2 enter from the top of the flocculation tank 4. Since the flow velocity in the guide tube 6 is much greater than the flow velocity of the incoming water and there is a fixed plate 19 to prevent short-flow, all the incoming water enters the guide tube 6 to ensure the residence time and flocculation effect.

[0039] In this embodiment, a sludge return pipeline 22 is connected to the bottom of the sedimentation tank 7, and the sludge return pipeline 22 is connected to the second reaction tank 2. In addition, a magnetic separation system 23 is included, and a magnetic powder separation pipeline 24 is connected between the magnetic separation system 23 and the sludge return pipeline 22, a magnetic powder return pipeline 25 is connected between the magnetic separation system 23 and the second reaction tank 2, and the magnetic separation system 23 is connected to a sludge discharge pipeline 26.

[0040] Specifically, the material inside the flocculation tank 4 enters the sedimentation tank 7 from the top after multiple cycles. Part of the sludge produced in the sedimentation tank 7 is directly returned through the sludge return pipeline 22, and part of it is discharged through the sludge discharge pipeline 26 after passing through the magnetic separation system 23. The separated magnetic powder is returned to the second reaction tank 2 through the magnetic powder return pipeline 25.

[0041] In summary, the utility model is provided with a first reaction tank 1, a second reaction tank 2, a first aeration coil 3, a flocculation tank 4, a second aeration coil 5, a guide tube 6, a sedimentation tank 7 and a third aeration coil 8; a raw water delivery pipeline 9 is connected to one side of the upper portion of the first reaction tank 1, and the bottom of the first reaction tank 1 and the bottom of the second reaction tank 2 are connected; the first aeration coil 3 is arranged at the inner bottom of the second reaction tank 2; the first reaction tank 1 is used for coagulation reaction of the received raw water, and the second reaction tank 2 is used for coagulation reaction of the received raw water in the first reaction tank 1 The material after the reaction is softened; the upper part of the flocculation tank 4 is connected to the upper part of the second reaction tank 2, the second aeration coil 5 is arranged at the inner bottom of the flocculation tank 4, and the guide tube 6 is fixed at the inner bottom of the flocculation tank 4; the flocculation tank 4 is used to magnetically separate and flocculate the softened material received from the second reaction tank 2; the upper part of the sedimentation tank 7 is connected to the upper part of the flocculation tank 4, an inclined tube is arranged inside the sedimentation tank 7, and the third aeration coil 8 is arranged at the bottom of the inclined tube; the sedimentation tank 7 is used to precipitate the material after magnetic separation and flocculation received from the flocculation tank 4. Since the second reaction tank 2 is prone to accumulate magnetic powder when there is a large amount of magnetic powder reflux, compressed air can be input to the first aeration coil 3 through the compressed air delivery main pipeline 16 and the first compressed air branch 10, and the first aeration coil 3 outputs compressed air to the second reaction tank 2 to avoid magnetic powder deposition at the bottom of the second reaction tank 2, and the first control valve 11 realizes the on-off control of the first compressed air branch 10. At the same time, compressed air can be input into the second aeration coil 5 through the compressed air delivery main pipeline 16 and the second compressed air branch 12 to prevent sludge blockage in the flocculation tank 4, and the second control valve 13 realizes the on-off control of the second compressed air branch 12. Compressed air can be input into the third aeration coil 8 through the compressed air delivery main pipeline 16 and the third compressed air branch 14 to prevent sludge blockage in the sedimentation tank 7, and the third control valve 15 realizes the on-off control of the third compressed air branch 14. Among them, the third aeration coil 8 adopts a partition design, and the opening interval and opening time of the third control valve 15 are controlled by program to realize automatic aeration and flushing to prevent sludge blockage. Aeration can be carried out in turn in different areas to reduce the impact on instantaneous water quality. The mixed materials in the second reaction tank 2 enter from the top of the flocculation tank 4. Since the flow rate in the guide tube 6 is much greater than the flow rate of the incoming water, and there is a fixed plate 19 to prevent short flow, all the incoming water enters the guide tube 6 to ensure the residence time and flocculation effect. The material inside the flocculation tank 4 enters the sedimentation tank 7 from the top after multiple cycles. The sludge produced in the sedimentation tank 7 is partially returned directly through the sludge return pipe 22, and partially discharged through the sludge discharge pipe 26 after passing through the magnetic separation system 23. The separated magnetic powder is returned to the second reaction tank 2 through the magnetic powder return pipe 25. The utility model has no plug flow area design, which reduces sludge deposition and is easy to construct; the design of the guide tube 6 ensures stable flow state and unchanged flocculation effect; the aeration design reduces the number of maintenance times and labor, and ensures long-term stable operation of the high-density tank; the sedimentation tank 7 is aerated with oblique pipes to achieve automatic flushing while ensuring the flushing effect.

[0042] In a possible embodiment, the magnetic flocculation high-density sedimentation tank 7 equipment is made of civil engineering, and the plane layout is shown in FIG. Figure 3 , the raw water enters the first reaction tank 1 from the top, and the coagulant is added for reaction. At the same time, lime and liquid alkali are added to adjust the pH. Then, the raw water enters the second reaction tank 2 from the bottom of the first reaction tank 1, and sodium carbonate is added to complete the full softening. The mixed materials enter from the top of the flocculation tank 4. Since the flow rate in the guide tube 6 is much greater than the flow rate of the incoming water, and there is a fixed plate 19 to prevent short flow, the incoming water all enters the guide tube 6 to ensure the residence time and flocculation effect. After multiple cycles, it enters the sedimentation tank 7 from the top. The generated sludge is partly returned directly, and partly discharged after passing through the magnetic separation system 23, and the magnetic powder is returned to the second reaction tank 2. During operation, the second reaction tank 2 is placed in the first aeration coil 3 at the bottom, the second aeration coil 5 at the bottom of the flocculation zone, and the third aeration coil 8 of the sedimentation tank 7 are controlled by the first control valve 11, the second control valve 13, and the third control valve 15 respectively. The opening interval and opening time of each valve are controlled by the program to realize automatic aeration and flushing to prevent fouling.

[0043] In a possible embodiment, the magnetic flocculation high-density sedimentation tank 7 is made of steel and has a plane layout as follows: Figure 4 As shown, the flow pattern is the same as that of the civil high-density tank. The steel high-density tank is smaller in size than the civil high-density tank. The aeration of the sedimentation tank 7 is not equipped with an automatic valve. During operation, the opening time and valve opening are manually controlled. The bottom coil of the second reaction tank 2 and the bottom coil of the flocculation zone are still controlled by automatic valves. The opening interval and opening time of each valve are controlled by the program to achieve automatic aeration and flushing to prevent fouling.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A magnetic flocculation high-density sedimentation tank (7) device, characterized in that: It comprises a first reaction tank (1), a second reaction tank (2), a first aeration coil (3), a flocculation tank (4), a second aeration coil (5), a draft tube (6), a sedimentation tank (7) and a third aeration coil (8); A raw water delivery pipeline (9) is connected to one side of the upper portion of the first reaction tank (1), and the bottom of the first reaction tank (1) and the bottom of the second reaction tank (2) are connected; the first aeration coil (3) is arranged at the inner bottom of the second reaction tank (2); the first reaction tank (1) is used to perform a coagulation reaction on the received raw water, and the second reaction tank (2) is used to soften the material received from the first reaction tank (1) after the coagulation reaction; The upper part of the flocculation tank (4) is connected to the upper part of the second reaction tank (2), the second aeration coil (5) is arranged at the inner bottom of the flocculation tank (4), and the guide tube (6) is fixed to the inner bottom of the flocculation tank (4); the flocculation tank (4) is used to perform magnetic separation and flocculation on the softened material received from the second reaction tank (2); The upper part of the sedimentation tank (7) is connected to the upper part of the flocculation tank (4), an inclined pipe is provided inside the sedimentation tank (7), and the third aeration coil (8) is arranged at the bottom of the inclined pipe; the sedimentation tank (7) is used to precipitate the material received after magnetic separation and flocculation in the flocculation tank (4).

2. A magnetic flocculation high-density sedimentation tank (7) device according to claim 1, characterized in that: The first aeration coil (3) is connected to a first compressed air branch (10), and the first compressed air branch (10) is provided with a first control valve (11); the second aeration coil (5) is connected to a second compressed air branch (12), and the second compressed air branch (12) is provided with a second control valve (13); the third aeration coil (8) is connected to a third compressed air branch (14), and the third compressed air branch (14) is provided with a third control valve (15); The first compressed air branch (10), the second compressed air branch (12), and the third compressed air branch (14) are connected together to a compressed air delivery main pipeline (16).

3. The magnetic flocculation high-density sedimentation tank (7) device according to claim 1, characterized in that: The first aeration coil (3) is distributed in a ring shape at the bottom of the second reaction tank (2); and the second aeration coil (5) is distributed in a ring shape at the bottom of the flocculation tank (4).

4. A magnetic flocculation high-density sedimentation tank (7) device according to claim 2, characterized in that: The third aeration coil (8) forms a plurality of partitions below the inclined tube, the third aeration coil (8) in each partition is connected to a third compressed air branch (14), and each third compressed air branch (14) is connected to a third control valve (15).

5. The magnetic flocculation high-density sedimentation tank (7) device according to claim 1, characterized in that: The guide tube (6) comprises a support frame (17), a cylinder (18) and a fixing plate (19); the side of the cylinder (18) is connected to the support frame (17), and the bottom of the support frame (17) is connected to the bottom of the flocculation tank (4); the fixing plate (19) is connected between the inner wall of the flocculation tank (4) and the outer wall of the cylinder (18); The upper end of the cylinder (18) is connected to a trumpet-shaped flow guide port (20); and the lower portion of the cylinder (18) is formed with a through opening (21).

6. The magnetic flocculation high-density sedimentation tank (7) equipment according to claim 1, characterized in that: The bottom of the sedimentation tank (7) is connected to a sludge return pipeline (22), and the sludge return pipeline (22) is connected to the second reaction tank (2).

7. A magnetic flocculation high-density sedimentation tank (7) device according to claim 6, characterized in that: It also comprises a magnetic separation system (23), a magnetic powder separation pipeline (24) is connected between the magnetic separation system (23) and the sludge return pipeline (22), and a magnetic powder return pipeline (25) is connected between the magnetic separation system (23) and the second reaction tank (2).

8. The magnetic flocculation high-density sedimentation tank (7) equipment according to claim 7, characterized in that: The magnetic separation system (23) is connected to a sludge discharge pipeline (26).

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