Tailing wastewater treatment and purification equipment

Abstract

The invention relates to the technical field of wastewater treatment, in particular to tailing wastewater treatment and purification equipment. Comprising a box body and a pair of bases installed at the lower end of the box body, a flocculation mechanism is arranged in the box body; the three flocculation tanks are arranged in series, the rotating speed gradient configuration of the stirring parts of the three flocculation tanks is matched with the structure of the sludge scraping backflow part to form a complete flocculation optimization system, and the three flocculation tanks respectively undertake different functions of floc formation, growth and maturity; activated sludge at the bottom of the mature flocculation basin is timely recovered and sent back to the initial flocculation basin by the sludge scraping backflow part, so that the whole system realizes staged optimization of the flocculation process and internal recycling of materials while keeping the simple equipment structure.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a tailings wastewater treatment and purification device. Background Technology

[0002] Tailings treatment processes generate large amounts of wastewater with high suspended solids, mainly composed of fine tailings and mineral particles. This wastewater must be treated before discharge or reuse to avoid environmental pollution and conserve water resources. Currently, the most common method for treating tailings wastewater is solid-liquid separation via sedimentation. A typical process involves adding a coagulant to the wastewater to rapidly mix it with suspended particles; then, in a flocculation tank, stirring causes the fine particles to collide and form larger particles called "flocs"; finally, the water flows into a sedimentation tank, where the flocs settle naturally under their own gravity, completing the separation process.

[0003] However, the following problems exist in the current tailings wastewater treatment process: First, because the traditional flocculation process is usually carried out in a single tank with uniform stirring conditions, the resulting flocs are loose in structure, small in size, and slow in settling speed. Second, these small flocs accumulate in large quantities at the bottom of the flocculation tank due to poor stirring, and continuously agglomerate with newly added sludge. This not only continuously occupies the effective volume of the tank and reduces the treatment capacity, but also renders a large amount of activated sludge that should participate in the reaction ineffective, turning it into "dead sludge" that needs to be cleaned regularly. Third, the above problems directly lead to a huge waste of reagent resources, because a considerable portion of the added coagulant and flocculant is ineffectively adsorbed or encapsulated in the deposited "dead sludge," or consumed in repeated flocculation processes caused by poor floc quality, failing to fully exert their effective functions of charge neutralization and adsorption bridging, resulting in high treatment costs.

[0004] Therefore, the problems of loose floc structure, severe sludge deposition at the bottom of the pool, and low reagent utilization caused by a single flocculation environment are technical problems that need to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the above problems, the present invention provides a tailings wastewater treatment and purification device to solve the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a tailings wastewater treatment and purification device, comprising a box and a pair of bases installed at its lower end, a cover plate fixedly installed at the upper end of the box; and a flocculation mechanism is provided inside the box.

[0007] The flocculation mechanism includes three flocculation tanks fixedly installed in the box from left to right. Each of the three flocculation tanks is an independent cylindrical shape. A feed hole is opened on the left side of the box, which is connected to the leftmost flocculation tank. A conveying section is set between adjacent flocculation tanks. Each of the three flocculation tanks is equipped with a stirring section. A sludge scraping and return section is set in the rightmost flocculation tank.

[0008] The stirring section includes a drive motor fixedly mounted on the upper end of the cover plate. The output shaft of the drive motor rotates through the cover plate and then a stirring rod is fixedly mounted thereon. The upper layer of the stirring rod is an axial flow blade and the lower layer is a turbine blade.

[0009] The sludge scraping and return section includes a rotating shaft coaxially mounted at the bottom of the rightmost flocculation tank. The rotating shaft is hollow, and a scraper is fixedly installed at the upper end of the rotating shaft. A slit suction port is opened on the scraper, and a connecting pipe connects the slit suction port to the rotating shaft. A suction section connected to the rotating shaft is provided on the box body.

[0010] The stirring sections in the three flocculation tanks operate at progressively decreasing speeds, allowing the flocs to sequentially complete the gradient process of collision destabilization, growth and expansion, and compaction and settling. The sludge scraping and return section drives the scraper to rotate via a rotating shaft, causing the slit suction port to scrape and suck at the same time, drawing the settled activated sludge into the inner cavity of the rotating shaft through the connecting pipe. The suction section then transports the activated sludge to the leftmost flocculation tank to re-participate in the flocculation process.

[0011] As a preferred embodiment, the suction unit includes a reflux pump fixedly installed on the upper end of the cover plate. A suction pipe is fixedly installed at the inlet end of the reflux pump. The other end of the suction pipe is rotatably connected to the lower end of the rotating shaft, and the suction pipe is connected to the rotating shaft. The outlet end of the reflux pump is connected to a discharge pipe that leads into the leftmost flocculation tank.

[0012] As a preferred embodiment, the conveying unit includes a conveying pump fixedly installed on the upper end of the cover plate, the inlet end of the conveying pump is connected to an input pipe extending into the bottom of the corresponding pre-stage flocculation tank, and the outlet end of the conveying pump is connected to an output pipe extending into the top of the corresponding post-stage flocculation tank.

[0013] As a preferred option, the rightmost flocculation tank is also equipped with a discharge pipe to discharge the treated water into the sedimentation tank.

[0014] As a preferred embodiment, the upper axial flow blades are folding blades or propellers, used to generate axial thrust; the lower turbine blades are straight-bladed disc turbines or inclined blade turbines, used to generate radial jets.

[0015] As a preferred embodiment, the reflux pump is a low-speed screw pump.

[0016] As a preferred embodiment, the delivery pump is a low-shear pump.

[0017] The above-mentioned one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: First, the present invention forms a complete flocculation optimization system by arranging three flocculation tanks in series and configuring the rotation speed gradient of the stirring part, combined with the sludge scraping and return section structure. The three flocculation tanks respectively undertake different functions of floc formation, growth and maturation. The sludge scraping and return section promptly recovers the activated sludge at the bottom of the mature flocculation tank and sends it back to the initial flocculation tank. This structural layout enables the entire system to achieve staged optimization of the flocculation process and internal recycling of materials while maintaining the simplicity of the equipment structure.

[0018] Second, this invention employs a progressively decreasing stirring speed setting, enabling the first-stage flocculation tank to achieve rapid mixing and particle collision at a higher speed, the second-stage flocculation tank to promote floc growth and expansion at a medium speed, and the third-stage flocculation tank to complete floc compaction and settling at a lower speed. This staged treatment method provides a suitable hydraulic environment for floc growth, allowing the flocs to complete the entire growth process from micro-flocs to mature flocs, effectively solving the problem of loose floc structure and poor settling performance caused by unsuitable mixing intensity in traditional single flocculation environments.

[0019] Third, this invention utilizes an integrated scraping and suction design combining a scraper and a slit suction port to simultaneously complete the scraping and collection of sludge from the bottom of the tank and negative pressure suction during rotation. This avoids long-term accumulation of sludge at the bottom of the tank, ensuring the effective volume of the flocculation tank. At the same time, it promptly sends sludge rich in flocculation activity back to the first-stage flocculation tank to re-participate in the flocculation reaction. This not only effectively prevents sludge deposition but also realizes the recycling of active components, significantly improving flocculation efficiency and reagent utilization.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a partial structural cross-sectional view of the conveying section of the present invention.

[0024] Figure 3 for Figure 2 Enlarged view of the structure at point A in the image.

[0025] Figure 4 This is a schematic diagram of the flocculation mechanism of the present invention.

[0026] Figure 5 This is a schematic diagram of the suction section structure of the present invention.

[0027] Figure 6 This is a schematic diagram of the sludge scraping and return section structure of the present invention.

[0028] Reference numerals: 10. Box body; 11. Base; 12. Cover plate; 2. Flocculation mechanism; 20. Flocculation tank; 21. Feed hole; 3. Sludge scraping and return section; 30. Rotating shaft; 31. Scraper; 32. Slit suction port; 33. Connecting pipe; 4. Suction section; 40. Return pump; 41. Suction pipe; 42. Discharge pipe; 5. Conveying section; 50. Conveying pump; 51. Input pipe; 52. Output pipe; 6. Stirring section; 60. Drive motor; 61. Stirring rod; 7. Discharge pipe. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] like Figure 1 , Figure 2 and Figure 4 As shown, a tailings wastewater treatment and purification device includes a housing 10 and a pair of bases 11 installed at its lower end. A cover plate 12 is fixedly installed at the upper end of the housing 10. A flocculation mechanism 2 is provided inside the housing 10.

[0031] like Figures 1-6 As shown, the flocculation mechanism 2 includes a fixing groove. The upper end of the box 10 is provided with fixing grooves from left to right. Flocculation tanks 20 are fixedly installed in each of the three fixing grooves. The three flocculation tanks 20 are all independent cylindrical. The left side of the box 10 is provided with a feed hole 21 that communicates with the leftmost flocculation tank 20. A conveying part 5 is provided between adjacent flocculation tanks 20. All three flocculation tanks 20 are provided with a stirring part 6. The rightmost flocculation tank 20 is provided with a sludge scraping and return part 3.

[0032] like Figure 1 and Figure 2 As shown, the rightmost flocculation tank 20 is also equipped with a discharge pipe 7, which is used to discharge the treated water to the sedimentation tank.

[0033] like Figures 1-6As shown, during actual operation, the tailings wastewater and coagulant are fully mixed in the external pipeline before entering the leftmost flocculation tank 20 through the feed hole 21 on the left side of the box 10. At this time, the stirring parts 6 in the three flocculation tanks 20 start working simultaneously, and the rotation speed of the stirring parts 6 decreases from left to right. This gradient setting makes the leftmost flocculation tank 20 form vigorous stirring to ensure that the agent and pollutants are fully mixed and contacted. In the next stage flocculation tank 20, the stirring intensity turns to medium intensity to promote the collision and growth of floc particles. Finally, in the rightmost flocculation tank 20, slow stirring is maintained to keep the flocs suspended and avoid breaking them.

[0034] The treated water is transferred sequentially to the rear via the conveying unit 5. When the water reaches the rightmost flocculation tank 20, the sludge scraping and return unit 3 starts operating. The rotating shaft 30 installed at the bottom of the tank drives the scraper 31 to rotate slowly, continuously sucking the activated sludge settled at the bottom of the tank into the inner cavity of the rotating shaft 30 through the slit suction port 32 on the scraper 31 and the connecting pipe 33. At this time, the suction unit 4 transports this highly active sludge back to the leftmost flocculation tank 20, so that it can participate in a new round of flocculation reaction as a high-quality nucleus. At the same time, the purified water that has completed the three-stage gradient flocculation treatment is stably discharged into the subsequent sedimentation tank through the discharge pipe 7 set on the flocculation tank 20 for solid-liquid separation. The separated clear water meets the standards for discharge or reuse. The sludge settled at the bottom of the rightmost flocculation tank 20 is periodically discharged for treatment. The entire system achieves continuous optimization of flocculation effect and significant improvement of reagent utilization rate through the change of stirring intensity and sludge return mechanism.

[0035] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the stirring part 6 includes a drive motor 60 fixedly installed on the upper end of the cover plate 12. The output shaft of the drive motor 60 rotates through the cover plate 12 and then a stirring rod 61 is fixedly installed. The upper layer of the stirring rod 61 is an axial flow blade and the lower layer is a turbine blade.

[0036] like Figure 4 and Figure 5 As shown, the upper axial flow blades are folding blades or propellers, used to generate axial thrust; the lower turbine blades are straight-bladed disk turbines or inclined blade turbines, used to generate radial jets.

[0037] like Figure 2 and Figure 4 As shown, the delivery pump 50 is a low-shear pump.

[0038] like Figures 1-6As shown, the conveying unit 5 includes a conveying pump 50 fixedly installed on the upper end of the cover plate 12. The inlet end of the conveying pump 50 is connected to an input pipe 51 that extends into the bottom of the corresponding pre-stage flocculation tank 20, and the outlet end of the conveying pump 50 is connected to an output pipe 52 that extends into the top of the corresponding post-stage flocculation tank 20.

[0039] like Figures 1-6 As shown, during actual operation, the stirring rod 61 is designed as a combination of a lower turbine blade and an upper axial flow blade. The lower turbine blade generates a strong radial jet, effectively sweeping the bottom area of ​​the flocculation tank 20, significantly reducing sludge deposition at the source; the upper axial flow blade generates a parallel axial flow, propelling the water along the stirring axis to ensure full contact and mixing of the flocculant and pollutants.

[0040] In the three flocculation tanks 20, although the same combined agitator is used, functional differentiation is achieved through graded speed regulation: the leftmost agitator 61 operates at high speed, and the synergistic effect of the upper and lower blades generates strong turbulence to promote particle collision and initial floc formation; the next-level agitator 61 operates at medium speed, with the upper axial flow blades driving the axial flow as the main force, creating a moderate mixing intensity so that the micro-flocs can continue to grow and expand; when the rightmost agitator 61 operates at low speed, the upper axial flow blades maintain a weak driving flow, while the anti-deposition effect of the lower turbine blades is correspondingly weakened, and some mature flocs naturally settle to the bottom of the tank. This method of using the same agitator and only adjusting the speed ensures that the flocs undergo a complete collision-growth-stabilization process, and greatly simplifies the system structure and maintenance process.

[0041] Meanwhile, the transport process between the flocculation tanks 20 is achieved by a low-shear transport pump 50 fixedly installed on the upper end of the cover plate 12. The inlet end of the transport pump 50 extends into the bottom of the previous flocculation tank 20 through the input pipe 51 to extract the liquid rich in flocs; the outlet end extends to the top of the subsequent flocculation tank 20 below the liquid surface through the output pipe 52 to deliver the liquid out in a stable flow state. This bottom-extraction and top-in transport method utilizes the characteristics of the low-shear pump to maximize the protection of the formed floc structure from damage during the transfer process. Its function is to ensure that each stage of the flocculation tank 20 forms an independent and optimal reaction environment, thereby achieving gradient optimization of the flocs.

[0042] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the sludge scraping return section 3 includes a rotating shaft 30 rotatably mounted on the bottom of the rightmost flocculation tank 20, which is coaxial with the rotating shaft 30. The rotating shaft 30 is a hollow structure, and a scraper 31 is fixedly mounted on the upper end of the rotating shaft 30. A slit suction port 32 is provided on the scraper 31, and a connecting pipe 33 is connected between the slit suction port 32 and the rotating shaft 30. A suction section 4 connected to the rotating shaft 30 is provided on the box body 10.

[0043] like Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, the suction unit 4 includes a reflux pump 40 fixedly installed on the upper end of the cover plate 12. A suction pipe 41 is fixedly installed at the inlet end of the reflux pump 40. The other end of the suction pipe 41 is rotatably connected to the lower end of the rotating shaft 30, and the suction pipe 41 is connected to the rotating shaft 30. The outlet end of the reflux pump 40 is connected to a discharge pipe 42 that leads to the leftmost flocculation tank 20.

[0044] like Figure 4 and Figure 5 As shown, the return pump 40 is a low-speed screw pump. This type of pump can ensure the continuity and stability of the flow of sludge with high solids content during transportation, avoiding the risk of blockage. At the same time, its low shear characteristics are designed to maximize the preservation of the physical and biological properties of activated sludge during transportation, so that it can enter the next cycle in the best condition.

[0045] like Figures 1-6 As shown, during actual operation, after the mature flocs in the rightmost flocculation tank 20 naturally settle to the bottom of the tank, the external motor drives the rotating shaft 30 to start rotating slowly via a belt. The rotating shaft 30 then drives the scraper 31 fixedly installed on its upper end to rotate synchronously. During the rotation of the scraper 31, the low-speed screw pump starts running, generating a stable negative pressure suction force at its inlet end. This suction force is transmitted through the suction pipe 41 to the inner cavity of the hollow rotating shaft 30 that is rotatably connected to it, and a continuous negative pressure environment is formed inside the rotating shaft 30. The settled sludge that comes into contact with it is immediately sucked into the inner cavity of the rotating shaft 30 through the connecting pipe 33, realizing an integrated operation of scraping and suction at the same time.

[0046] Finally, the activated sludge sucked into the inner cavity of the rotating shaft 30 is continuously pumped into the low-speed screw pump through the suction pipe 41 under negative pressure, and finally stably transported back to the leftmost flocculation tank 20 through the discharge pipe 42 connected to the outlet of the low-speed screw pump. The sludge collected by the sludge scraping return section 3 contains a large number of mature floc particles that have not completely lost their activity. When it is returned to the high-speed operating leftmost flocculation tank 20, these particles act as "nuclei" for the flocculation reaction, providing a large number of adsorption and attachment points for newly formed destabilized colloids in the water. This process utilizes the system's own structure to realize the internal circulation of active components. The direct result is to reduce the time and amount of reagents required to form flocs from scratch, thereby reducing reagent consumption. At the same time, it solves the problem of sludge deposition at the bottom of the tank, forming an efficient sludge recycling system.

[0047] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0048] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A tailings wastewater treatment and purification device, comprising a housing and a pair of bases installed at its lower end, wherein a cover plate is fixedly installed at the upper end of the housing; characterized in that: The box is equipped with a flocculation mechanism; The flocculation mechanism includes three flocculation tanks fixedly installed in the box from left to right. Each of the three flocculation tanks is an independent cylindrical shape. A feed hole communicating with the leftmost flocculation tank is opened on the left side of the box. A conveying section is set between adjacent flocculation tanks. Each of the three flocculation tanks is equipped with a stirring section. A sludge scraping and return section is set in the rightmost flocculation tank. The stirring section includes a drive motor fixedly mounted on the upper end of the cover plate. The output shaft of the drive motor rotates through the cover plate and then a stirring rod is fixedly mounted thereon. The upper layer of the stirring rod is an axial flow blade and the lower layer is a turbine blade. The sludge scraping and return section includes a rotating shaft that is rotatably installed coaxially at the bottom of the rightmost flocculation tank. The rotating shaft is a hollow structure, and a scraper is fixedly installed at the upper end of the rotating shaft. A slit suction port is opened on the scraper, and a connecting pipe is connected between the slit suction port and the rotating shaft. A suction section connected to the rotating shaft is provided on the box body. The stirring sections in the three flocculation tanks operate at progressively decreasing speeds, allowing the flocs to sequentially complete the gradient process of collision destabilization, growth and expansion, and compaction and settling. The sludge scraping and return section drives the scraper to rotate via a rotating shaft, causing the slit suction port to scrape and suck at the same time, drawing the settled activated sludge into the inner cavity of the rotating shaft through the connecting pipe. The suction section then transports the activated sludge to the leftmost flocculation tank to re-participate in the flocculation process.

2. The tailings wastewater treatment and purification equipment according to claim 1, characterized in that: The suction unit includes a reflux pump fixedly installed on the upper end of the cover plate. A suction pipe is fixedly installed at the inlet end of the reflux pump. The other end of the suction pipe is rotatably connected to the lower end of the rotating shaft, and the suction pipe is connected to the rotating shaft. The outlet end of the reflux pump is connected to a discharge pipe that leads into the leftmost flocculation tank.

3. The tailings wastewater treatment and purification equipment according to claim 1, characterized in that: The conveying unit includes a conveying pump fixedly installed on the upper end of the cover plate. The inlet end of the conveying pump is connected to an input pipe that extends into the bottom of the corresponding pre-stage flocculation tank, and the outlet end of the conveying pump is connected to an output pipe that extends into the top of the corresponding post-stage flocculation tank.

4. The tailings wastewater treatment and purification equipment according to claim 1, characterized in that: The rightmost flocculation tank is also equipped with a discharge pipe to discharge the treated water into the sedimentation tank.

5. The tailings wastewater treatment and purification equipment according to claim 1, characterized in that: The upper axial flow blades are folding blades or propellers, used to generate axial thrust; the lower turbine blades are straight-bladed disc turbines or inclined blade turbines, used to generate radial jets.

6. The tailings wastewater treatment and purification equipment according to claim 2, characterized in that: The reflux pump is a low-speed screw pump.

7. The tailings wastewater treatment and purification equipment according to claim 3, characterized in that: The delivery pump is a low-shear pump.

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