Secondary sedimentation tank for wastewater treatment

Abstract

The invention provides a secondary sedimentation tank for wastewater treatment, and mainly relates to the technical field of wastewater treatment. A secondary sedimentation tank for wastewater treatment comprises a sedimentation tank body and a working bridge fixedly arranged at the top of the sedimentation tank body, a transmission shaft penetrates through the center of the working bridge, a mud scraping assembly is arranged at the lower end of the transmission shaft, a flow stabilizing barrel is arranged at the center of the bottom face of the working bridge, and a water inlet pipe is fixed to one side of the upper portion of the flow stabilizing barrel. A water outlet is formed in the bottom of the flow stabilizing barrel, a settling tank for collecting sludge is formed in the center of the bottom surface of the settling pond, and a secondary settling component is arranged at the upper part in the settling pond. Compared with the prior art, the bastnaesite tailing wastewater treatment device has the beneficial effects that through the synergistic effect of the flow stabilizing barrel and the secondary precipitation assembly, impact disturbance generated when bastnaesite tailing wastewater is fed is avoided, fine components are secondarily intercepted, the precipitation efficiency of rare earth particles and suspended solids is greatly improved, and the service life of the bastnaesite tailing wastewater treatment device is prolonged. The problem that an existing sedimentation tank is insufficient in interception of tailing wastewater fine particles is solved.

Description

Technical Field

[0001] The invention mainly relates to the technical field of wastewater treatment, in particular to a secondary sedimentation tank for wastewater treatment. Background Art

[0002] Fluorocarbonate tailings wastewater contains a large amount of rare earth particles, suspended matter, and soluble salts. Direct discharge will cause waste of rare earth resources and pollute the environment. Therefore, it needs to be treated through secondary sedimentation to achieve solid-liquid separation and resource recovery. The existing secondary sedimentation tank has the following deficiencies when treating this type of wastewater: First, the water inflow causes great disturbance. Traditional sedimentation tanks mostly use direct water inflow. High-concentration tailings wastewater easily forms turbulence after entering the tank, causing the settled rare earth particles to float again, reducing the sedimentation efficiency. Second, the fine particle retention effect is poor. The fine-grained rare earth components in fluorocarbon cerium ore tailings settle slowly. The existing sedimentation tanks lack targeted secondary interception structures, and a large amount of fine particles are lost with the effluent, affecting the resource recovery rate. Therefore, considering the characteristics of fluorocarbon cerium tailings wastewater, there is an urgent need for a secondary sedimentation tank that can reduce water disturbance, enhance fine particle retention, improve sludge collection efficiency and adapt to fluctuations in operating conditions. Summary of the Invention

[0003] To address the deficiencies of the prior art, the present invention provides a secondary sedimentation tank for wastewater treatment, which is implemented through the following technical solutions: A secondary sedimentation tank for wastewater treatment comprises a sedimentation tank and a working bridge fixed on the top thereof, a transmission shaft passing through the center of the working bridge, a sludge scraping assembly being provided at the lower end of the transmission shaft, the transmission shaft being driven to rotate by a driving assembly provided on the top surface of the working bridge, a flow stabilizing barrel being provided at the center of the bottom surface of the working bridge, the transmission shaft vertically passing through the flow stabilizing barrel and being loosely fitted with the flow stabilizing barrel, an inlet pipe being fixed on one side of the upper part of the flow stabilizing barrel, a water outlet being provided at the bottom of the flow stabilizing barrel, a trough for collecting sludge being provided at the center of the bottom surface of the sedimentation tank, and a secondary sedimentation assembly being provided at the upper part of the sedimentation tank.

[0004] Furthermore, the scraper assembly includes: Support arms, wherein a plurality of support arms distributed in a circular array are fixedly installed on the lower portion of the outer periphery of the transmission shaft; Scraper blades: the bottom surfaces of the support arms are fixedly mounted with scraper blades distributed in an array along their axial direction, and the bottom surfaces of the scraper blades are in sliding cooperation with the bottom surface of the inner wall of the sedimentation tank.

[0005] Furthermore, the secondary precipitation component includes: A support frame, the support frame is fixed in the sedimentation tank in a "cross" shape, an annular support plate is provided at the center of the support frame, and the flow stabilizing barrel is inserted into the annular support plate; The guide module is fixedly mounted on the top surface of the support frame.

[0006] Furthermore, the flow guide module is composed of several socketed conical flow guide plates, the diameters of the conical flow guide plates increase from the inside to the outside, and the conical flow guide plates are narrow at the top and wide at the bottom, and the flow stabilizing barrel passes through the conical flow guide plate located at the innermost side.

[0007] Furthermore, the drive assembly includes a drive motor, a reducer, and a control cabinet. The drive motor is fixedly installed on the top surface of the working bridge through a bracket. The output shaft of the drive motor is connected to the reducer. The input shaft of the reducer is fixedly connected to the upper end of the transmission shaft. The control cabinet is electrically connected to the drive motor.

[0008] Furthermore, the bottom of the inner wall of the sedimentation tank is an inverted cone structure that is wide at the top and narrow at the bottom. Furthermore, a mud extraction pipe is fixedly installed on the bottom surface of the trough, and the bottom of the inner wall of the trough is concave toward the center.

[0009] Furthermore, an extension rod is fixedly mounted on the lower end of the transmission shaft, a scraper is fixedly mounted on the lower end of the extension rod, and the bottom surface of the scraper is in contact with the bottom surface of the inner wall of the trough.

[0010] Furthermore, a drainage trough is provided on the upper portion of the inner wall of the sedimentation tank. The drainage trough is arranged in a ring shape at the opening of the sedimentation tank, and an overflow plate is fixedly installed on the top of the inner side of the drainage trough in an integrated manner.

[0011] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the synergistic effect of the flow stabilization tank and the secondary sedimentation component, the impact disturbance during the inflow of fluorocarbon cerium ore tailings wastewater is avoided, and the fine components are intercepted for the second time, which greatly improves the sedimentation efficiency of rare earth particles and suspended solids, and solves the problem of insufficient interception of fine particles in tailings wastewater in existing sedimentation tanks.

[0012] 2. The bottom of the inverted cone sedimentation tank is equipped with a sludge scraper assembly and a scraper at the sedimentation trough to form a comprehensive sludge collection system, which can efficiently collect rare earth-containing sludge and discharge it through the sludge suction pipe, reducing sludge residue and waste of rare earth resources, and overcoming the defect of incomplete sludge cleaning in existing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 Schematic diagram of the bottom structure of the sedimentation tank of the present invention; Figure 3 It is a schematic cross-sectional view of the sedimentation tank of the present invention; Figure 4 yes Figure 3 Partial enlarged view of Ⅰ; Figure 5 Schematic diagram of the internal structure of the sedimentation tank of the present invention; Figure 6 It is a schematic structural diagram of the secondary precipitation assembly of the present invention; Figure 7 It is a schematic diagram of the combined state of the diversion module of the present invention.

[0014] The numbers shown in the accompanying drawings are: 10, sedimentation tank; 101, sedimentation trough; 102, mud suction pipe; 20, working bridge; 201, transmission shaft; 202, flow stabilizing barrel; 203, water inlet pipe; 204, water outlet; 205, extension rod; 206, scraper; 30, mud scraping assembly; 301, support arm; 302, mud scraping plate; 40, secondary sedimentation assembly; 401, support frame; 402, diversion module; 50, drainage trough; 501, overflow plate. DETAILED DESCRIPTION

[0015] The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0016] Example: A secondary sedimentation tank for wastewater treatment like Figure 1-7 As shown, a secondary sedimentation tank for wastewater treatment, its specific structure includes: The sedimentation tank 10 and the working bridge 20 fixed on the top thereof, the center of the working bridge 20 is penetrated by a transmission shaft 201, the lower end of the transmission shaft 201 is provided with a sludge scraping assembly 30, the transmission shaft 201 is driven to rotate by a driving assembly arranged on the top surface of the working bridge 20, a stabilizing barrel 202 is provided at the center of the bottom surface of the working bridge 20, the transmission shaft 201 vertically penetrates the stabilizing barrel 202 and is loosely fitted with it, a water inlet pipe 203 is fixed on one side of the upper part of the stabilizing barrel 202, and a water outlet 204 is provided at the bottom of the stabilizing barrel 202, a trough 101 for collecting sludge is provided at the center of the bottom surface of the sedimentation tank 10, and a secondary sedimentation assembly 40 is provided at the upper part of the sedimentation tank 10.

[0017] The above works as follows: Rare earth particles and suspended solids contained in the bastnaesite tailings wastewater enter the steady-flow tank 202 through the inlet pipe 203 and flow smoothly into the sedimentation tank 10 through the bottom outlet 204, preventing high-concentration tailings particles from being stirred up by the water flow. The drive assembly rotates the transmission shaft 201, causing the scraper assembly 30 to scrape the rare earth-containing sludge from the bottom of the tank toward the sedimentation tank 101. The secondary sedimentation assembly 40 intercepts unsettled fine components in the rising water flow, allowing clean water to overflow from the top. The flow stabilization barrel 202 can reduce water inlet disturbance, prevent tailings particle diffusion, and improve the rare earth particle sedimentation efficiency; the secondary sedimentation component 40 enhances the interception capacity of fine suspended matter and reduces the loss of rare earth in wastewater; the sludge scraping component 30 centrally collects rare earth-containing sludge to facilitate resource recovery and avoid sedimentation blockage affecting the processing volume. The scraper assembly 30 includes: Support arms 301, a plurality of support arms 301 distributed in a circular array are fixedly installed on the lower portion of the outer periphery of the transmission shaft 201; Scraper blades 302 : The bottom surfaces of the support arms 301 are fixedly mounted with scraper blades 302 distributed in an array along their axial direction. The bottom surfaces of the scraper blades 302 are in sliding cooperation with the bottom surface of the inner wall of the sedimentation tank 10 .

[0018] When the drive shaft 201 rotates, it drives the support arm 301 to perform circular motion, and the scraper 302 slides along the bottom of the sedimentation tank 10, pushing the dispersed rare earth-containing sludge to the central trough 101. According to the high-density sludge characteristics of tailings wastewater, the scraping angle of the scraper 302 can be adaptively adjusted to reduce resistance, reduce energy consumption and improve the scraping effect. Multiple scraper blades 302 are distributed in an array along the support arm 301 to expand the scraping range and ensure that the rare earth sludge at the bottom of the pool is cleaned without dead corners; the sliding fit design reduces the residual high-viscosity tailings sludge, improves the rare earth recovery rate, and reduces subsequent processing costs.

[0019] The secondary precipitation component 40 includes: The support frame 401 is fixed in the sedimentation tank 10 in a "cross" shape. The center of the support frame 401 is provided with an annular support plate, and the stabilizing barrel 202 is inserted into the annular support plate; The flow guide module 402 is fixedly mounted on the top surface of the support frame 401 .

[0020] The "cross"-shaped support frame 401 provides stable support for the diversion module 402, and the annular support plate limits and reinforces the flow stabilization barrel 202 to resist the impact of tailings wastewater and prevent the diversion module 402 from being deformed by the impact of high-concentration tailings water flow; the diversion module 402 guides the water flow to rise slowly along the preset path, extending the sedimentation time of rare earth fine particles.

[0021] The flow guide module 402 is composed of a plurality of socketed conical flow guide plates, the diameters of which increase from the inside to the outside, and the conical flow guide plates are narrow at the top and wide at the bottom. The flow stabilizing barrel 202 passes through the conical flow guide plate located at the innermost side.

[0022] The diameter of the conical guide plate increases from the inside to the outside, forming a multi-layer guide channel. After the fluorocarbon cerium ore tailings wastewater flows out of the steady flow barrel 202, it flows upward along the inclined surface of the conical plate. The rare earth particles and associated impurities are intercepted layer by layer under the action of gravity and settle downward along the plate surface, which is adapted to the characteristics of the wide gradation of tailings particles. The guide plate with a multi-layer conical structure can greatly extend the water flow path and enhance the probability of collision and sedimentation of rare earth particles of different particle sizes; the narrow top and wide bottom design guides the high-concentration tailings water flow to diffuse evenly, avoids local turbulence causing fine particles to escape, and improves the rare earth retention rate of secondary precipitation.

[0023] The drive assembly includes a drive motor, a reducer, and a control cabinet. The drive motor is fixedly mounted on the top surface of the working bridge 20 via a bracket. The output shaft of the drive motor is in driving connection with the reducer, and the input shaft of the reducer is fixedly connected to the upper end of the transmission shaft 201. The control cabinet is electrically connected to the drive motor. In actual use, the user can control the start of the drive motor through the control cabinet according to the amount of tailings wastewater and sludge concentration. The motor power is reduced by the reducer and then transmitted to the transmission shaft 201, allowing the sludge scraper assembly 30 to operate stably at an appropriate speed to cope with the high sludge volume during peak tailings discharge periods. The drive motor and reducer work together to provide stable torque, ensuring that the scraper assembly 30 operates efficiently in high-viscosity tailings sludge; the control cabinet can also realize automatic speed regulation, reduce manual intervention, adapt to fluctuations in tailings wastewater flow, and reduce energy consumption.

[0024] The bottom of the inner wall of the sedimentation tank 10 is an inverted cone-shaped structure that is wide at the top and narrow at the bottom. This inverted cone-shaped structure utilizes gravity to allow the deposited rare earth sludge to naturally slide along the inclined inner wall toward the central trough 101. This structure, combined with the scraper assembly 30, accelerates the convergence of high-density sludge, enhances the centripetal flow of sludge, improves rare earth sludge collection efficiency, and reduces sludge retention, thereby reducing energy consumption and equipment wear.

[0025] A sludge extraction pipe 102 is fixedly mounted on the bottom of the trough 101, and the bottom of the inner wall of the trough 101 is recessed toward the center. This recessed design allows high-concentration rare earth sludge to naturally collect. The sludge extraction pipe 102 extracts the concentrated sludge for rare earth recovery processing, preventing sludge from compacting within the trough. This recessed structure improves rare earth sludge collection efficiency. The sludge extraction pipe 102 directly extracts high-concentration sludge, reducing energy and water consumption, lowering the risk of pipeline blockage due to tailings particles, and facilitating subsequent rare earth extraction processes.

[0026] An extension rod 205 is fixedly mounted at the lower end of the drive shaft 201. A scraper 206 is fixedly mounted at the lower end of the extension rod 205. The bottom surface of the scraper 206 is in contact with the bottom surface of the inner wall of the trough 101. As the drive shaft 201 drives the extension rod 205 to rotate, the scraper 206 slides against the bottom surface of the trough 101, scraping the dense tailings sludge deposited in the depression to the suction port of the sludge extraction pipe 102. This prevents the rare earth particles from compacting due to long-term static standing, thereby improving trough utilization and cleaning efficiency.

[0027] A drainage trough 50 is provided at the upper portion of the inner wall of the sedimentation tank 10. The drainage trough 50 is arranged in an annular shape at the opening of the sedimentation tank 10, and an overflow plate 501 is fixedly installed on the top of the inner side of the drainage trough 50. Clean water after secondary sedimentation rises to the upper portion of the sedimentation tank 10 and overflows into the annular drainage trough 50 through the overflow plate 501. The drainage trough 50 concentrates the clean water and the overflow plate 501 intercepts floating tailings debris, further purifying the effluent to meet mining wastewater discharge standards and reduce the impact on the surrounding environment.

[0028] This solution also includes a controller, the position of which is set by the staff according to actual conditions during operation. The controller is used to control the electrical devices used in this solution, including but not limited to sensors, motors, telescopic rods, water pumps, solenoid valves, heating wires, heat pumps, display screens, computer input devices, switch buttons, communication equipment, lights, speakers and microphones; the controller is an Intel processor, AMD processor, PLC controller, ARM processor or a single-chip microcomputer, and the supporting components also include a motherboard, memory stick, storage medium and power supply, and the power supply is AC or lithium battery; when a display screen is provided, a display card is also provided; for the operating principle of the controller, please refer to "Principles of Automatic Control", "Microcontroller Principles and Application Simulation Cases" and "Sensor Principles and Applications" published by Tsinghua University Press, and other books in this field can be used for reference; other automatic controls and electrical devices not mentioned are all knowledge well known to those skilled in the art and will not be repeated here.

[0029] In the explanation of the present invention, it should be noted that the terms indicating orientation are only for the convenience of description and understanding, and are not the only limitation on the installation position of specific technical features, and do not exclude other possible installation methods.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A secondary sedimentation tank for wastewater treatment, comprising a sedimentation tank (10) and a working bridge (20) fixed on the top thereof, characterized in that: A transmission shaft (201) is provided through the center of the working bridge (20), a sludge scraping assembly (30) is provided at the lower end of the transmission shaft (201), the transmission shaft (201) is driven to rotate by a driving assembly provided on the top surface of the working bridge (20), a flow stabilizing barrel (202) is provided at the center of the bottom surface of the working bridge (20), the transmission shaft (201) vertically penetrates the flow stabilizing barrel (202) and is clearance-matched with the flow stabilizing barrel (202), a water inlet pipe (203) is fixed on one side of the upper part of the flow stabilizing barrel (202), a water outlet (204) is provided at the bottom of the flow stabilizing barrel (202), a trough (101) for collecting sludge is provided at the center of the bottom surface of the sedimentation tank (10), and a secondary sedimentation assembly (40) is provided at the upper part of the sedimentation tank (10).

2. A secondary sedimentation tank for wastewater treatment according to claim 1, characterized in that: The mud scraping assembly (30) includes: Support arms (301), wherein a plurality of support arms (301) distributed in a circular array are fixedly mounted on the lower portion of the outer periphery of the transmission shaft (201); Scraper blades (302), the bottom surfaces of the support arms (301) are fixedly mounted with scraper blades (302) distributed in an array along their axial direction, and the bottom surfaces of the scraper blades (302) are in sliding engagement with the bottom surface of the inner wall of the sedimentation tank (10).

3. A secondary sedimentation tank for wastewater treatment according to claim 2, characterized in that: The secondary precipitation component (40) includes: A support frame (401), the support frame (401) is fixedly arranged in a "cross" shape in the sedimentation tank (10), an annular support plate is provided at the center of the support frame (401), and the flow stabilizing barrel (202) is inserted into the annular support plate; A flow guide module (402) is fixedly mounted on the top surface of the support frame (401).

4. A secondary sedimentation tank for wastewater treatment according to claim 1, characterized in that: The flow guide module (402) is composed of a plurality of sleeved conical flow guide plates, the diameters of the conical flow guide plates increasing from the inside to the outside, and the conical flow guide plates are narrow at the top and wide at the bottom, and the flow stabilizing barrel (202) passes through the conical flow guide plate located at the innermost side.

5. The secondary sedimentation tank for wastewater treatment according to claim 1, characterized in that: The driving assembly comprises a driving motor, a reducer, and a control cabinet. The driving motor is fixedly mounted on the top surface of the working bridge (20) via a bracket. The output shaft of the driving motor is connected to the reducer in a transmission manner. The input shaft of the reducer is fixedly connected to the upper end of the transmission shaft (201). The control cabinet is electrically connected to the driving motor.

6. A secondary sedimentation tank for wastewater treatment according to claim 4, characterized in that: The bottom of the inner wall of the sedimentation tank (10) is an inverted cone structure that is wide at the top and narrow at the bottom.

7. A secondary sedimentation tank for wastewater treatment according to claim 1, characterized in that: A mud extraction pipe (102) is fixedly installed on the bottom surface of the trough (101), and the bottom of the inner wall of the trough (101) is concave toward the center.

8. A secondary sedimentation tank for wastewater treatment according to claim 7, characterized in that: An extension rod (205) is fixedly mounted on the lower end of the transmission shaft (201), and a scraper (206) is fixedly mounted on the lower end of the extension rod (205), wherein the bottom surface of the scraper (206) is in contact with the bottom surface of the inner wall of the sink (101).

9. A secondary sedimentation tank for wastewater treatment according to claim 3, characterized in that: A drainage trough (50) is provided on the upper portion of the inner wall of the sedimentation tank (10). The drainage trough (50) is arranged in a ring shape at the opening of the sedimentation tank (10), and an overflow plate (501) is fixedly installed integrally on the top of the inner side of the drainage trough (50).

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