Fluorine removal device of mine water membrane adsorption reactor

Abstract

The utility model discloses a kind of mine water film adsorption reactor defluorination device, it relates to the technical field of mining wastewater treatment, including defluorination pool and microfilter tank, the top of the defluorination pool is equipped with water inlet for putting fluorine-containing mine water, and feed inlet for putting defluorination reagent, the bottom of the defluorination pool is equipped with the through opening being linked with microfilter tank, the top and bottom of the microfilter tank are equipped with water outlet and sludge discharge port respectively, filtering frame is fixedly arranged in the microfilter tank, microfiltration membrane is fixedly arranged on the filtering frame, and the microfiltration membrane is located between through opening and water outlet, efficient purification of fluorine-containing mine water is realized by defluorination pool and microfilter tank, avoid the flocculation effect poor, mud and sand filter tank blockage and other problems caused by PAM parameter out of control, operation difficulty is greatly reduced. Since PAM is not needed to be used, sludge quantity increase, moisture content increase caused by PAM addition do not occur, subsequent sludge transportation, disposal cost is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of mining wastewater treatment, specifically to a defluorination device for a mine water film adsorption reactor. Background Technology

[0002] Coal mine water, generated during mining operations, often carries high levels of fluoride due to the combined effects of geological conditions and mining activities. This fluoride primarily originates from fluoride-containing minerals in the coal seam and surrounding rock strata. During long-term seepage and scouring by the mine water, it dissolves and enters the water body, leading to significantly excessive fluoride ion concentrations in the mine water. If discharged directly without treatment, this fluoride-containing mine water will cause serious harm to the surrounding ecological environment.

[0003] Currently, conventional defluoridation methods for fluoride-containing mine water mostly adopt a combination process of "defluoridation tank + flocculation tank + sedimentation tank + sand filter". The core of this process is to enrich fluoride ions with defluoridation materials, rely on PAM flocculation to form flocs, and then remove fluoride ions through sedimentation and sand filtration.

[0004] However, this method has its drawbacks. The process is complex and requires strict control of operating parameters, such as PAM type, dissolution parameters, dosage, stirring intensity, and hydraulic retention time in the sedimentation tank. If these parameters are out of balance, it can easily lead to poor flocculation and frequent sludge leakage, which in turn can cause blockage of the sand filter and increase maintenance costs. In addition, the addition of PAM significantly increases the water content and volume of sludge, which not only results in high subsequent treatment costs but may also exacerbate the blockage problem due to the seepage of high-water-content sludge into the sand filter, leading to a decrease in the stability of system operation. Utility Model Content

[0005] This invention provides a defluorination device for a mine water film adsorption reactor, which can solve the problems of complex processes, poor flocculation effect, sludge runoff and sand filter blockage caused by parameter imbalance in the prior art. Furthermore, the addition of PAM increases the amount and moisture content of sludge, raises the disposal cost and exacerbates the blockage of sand filters.

[0006] A defluorination device for mine water membrane adsorption reactor includes a defluorination tank and a microfiltration tank. The defluorination tank has an inlet at the top for adding fluoride-containing mine water and an inlet for adding a defluorinating agent. The bottom of the defluorination tank has an outlet communicating with the microfiltration tank. The microfiltration tank has an outlet at the top and a sludge discharge outlet at the bottom. A filter frame is fixedly installed inside the microfiltration tank, and a microfiltration membrane is fixedly installed on the filter frame, located between the inlet and the outlet. The defluorination tank is equipped with a stirring mechanism for mixing the fluoride-containing mine water and the defluorinating agent, and a backwashing mechanism for flushing the microfiltration membrane. A V-shaped sedimentation tank is located at the bottom of the defluorination tank. The defluorinating agent is hydroxyapatite.

[0007] According to one embodiment of this utility model, the backwashing mechanism includes a flushing pipe and a booster nozzle. The booster nozzle is connected to the flushing pipe. The flushing pipe is fixedly installed in a bow shape inside the microfiltration tank and located between the microfiltration membrane and the water outlet. Several booster nozzles are arranged in a rectangular array at the bottom of the flushing pipe. The backwashing mechanism also includes a water pump. The input end of the water pump is connected to a tap water pipe, and the output end of the water pump is connected to the flushing pipe.

[0008] According to one embodiment of this utility model, the backwashing mechanism includes a flushing pipe and pressurizing nozzles. The pressurizing nozzles are connected to the flushing pipe. The flushing pipe is fixedly installed in a bow shape inside the microfiltration tank, located between the microfiltration membrane and the outlet. Several pressurizing nozzles are arranged in a rectangular array at the bottom of the flushing pipe. The backwashing mechanism also includes an air pump, the output end of which is connected to the flushing pipe. Both the defluorination tank and the microfiltration tank have vent holes at their tops. The backwashing mechanism also includes several filter screens, which are respectively fixedly installed at the vent holes and the input end of the air pump.

[0009] According to one embodiment of the present invention, the stirring mechanism includes a stirring assembly and a driving assembly. The stirring assembly includes a rotating shaft and stirring rods. The rotating shaft is rotatably connected to the defluorination tank. Several stirring rods are arranged in a circular array and fixedly disposed on the side of the rotating shaft. The driving assembly is used to rotate the rotating shaft. Several groups of stirring assemblies are arranged in a rectangular array within the defluorination tank. The driving assembly includes driven wheels, driving wheels, and a synchronous belt. Multiple driven wheels are arranged and coaxially fixedly connected to the rotating shaft of their respective stirring assemblies. The driving wheels are rotatably connected to the defluorination tank. The synchronous belt is disposed between all driven wheels and the driving wheels. The driving assembly also includes a driving motor, which is fixedly connected to the defluorination tank. The output end of the driving motor is coaxially fixedly connected to the driving wheel.

[0010] The advantages of this utility model compared to the prior art are:

[0011] The efficient purification of fluoride-containing mine water through defluoridation tanks and microfiltration tanks avoids problems such as poor flocculation, sludge runoff, and sand filter clogging caused by uncontrolled PAM parameters, significantly reducing operational difficulty. Since PAM is not used, there is no increase in sludge volume or moisture content due to its addition, resulting in significantly reduced sludge transportation and disposal costs. Simultaneously, it reduces the risk of clogging the filtration system by high-moisture sludge, lowers the frequency and cost of equipment backwashing and maintenance, and extends equipment lifespan. The stirring mechanism in the defluoridation tank ensures sufficient contact between the defluoridating agent and the mine water, improving fluoride ion removal efficiency. The retention effect of the microfiltration membrane further ensures effluent quality, making the treated water more likely to meet standards. The backwashing mechanism cleans the microfiltration membrane promptly, maintaining stable filtration performance.

[0012] Additional aspects and advantages of this 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

[0013] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0014] Figure 1 This is a three-dimensional structural diagram of a defluorination device for a mine water film adsorption reactor.

[0015] Figure 2 This is a three-dimensional structural diagram of the defluorination tank and microfiltration tank in this utility model.

[0016] Figure 3 This is a three-dimensional structural cross-sectional view of the defluorination tank and microfiltration tank in this utility model.

[0017] The reference numerals in the figures include:

[0018] 1. Defluoridation tank; 2. Microfiltration tank; 3. Inlet; 4. Feed inlet; 5. Outlet; 6. Outlet; 7. Sludge discharge port; 8. Filter frame; 9. Microfiltration membrane; 10. Agitator; 11. Backwashing mechanism; 12. Flushing pipe; 13. Booster nozzle; 14. Sedimentation tank; 15. Agitator assembly; 16. Drive assembly; 17. Rotary shaft; 18. Agitator rod; 19. Driven wheel; 20. Drive wheel; 21. Synchronous belt; 22. Drive motor. Detailed Implementation

[0019] The specific embodiments of this utility model are described in detail below, but it should be understood that the scope of protection of this utility model is not limited to the specific embodiments.

[0020] like Figures 1 to 3As shown, a defluorination device for mine water membrane adsorption reactor includes a defluorination tank 1 and a microfiltration tank 2. The top of the defluorination tank 1 has an inlet 3 for adding fluoride-containing mine water and an inlet 4 for adding a defluorinating agent. The bottom of the defluorination tank 1 has an outlet 5 communicating with the microfiltration tank 2. The top and bottom of the microfiltration tank 2 have an outlet 6 and a sludge discharge outlet 7, respectively. A filter frame 8 is fixedly installed inside the microfiltration tank 2, and a microfiltration membrane 9 is fixedly installed on the filter frame 8, with the microfiltration membrane 9 located between the outlet 5 and the outlet 6. The defluorination tank 1 is equipped with a stirring mechanism 10 for stirring the fluoride-containing mine water and the defluorinating agent, and the microfiltration tank 2 is equipped with a backwashing mechanism 11 for rinsing the microfiltration membrane 9. The bottom of the defluorination tank 1 has a V-shaped sedimentation tank 14. The defluorinating agent is hydroxyapatite.

[0021] Fluorine-containing mine water enters from the inlet 3 at the top of the defluorination tank 1, while hydroxyapatite is added as a defluorination agent through the feed inlet 4. The stirring mechanism 10 inside the defluorination tank 1 is activated, allowing the mine water and hydroxyapatite to fully mix and contact to form a mixed solution. Utilizing the displacement reaction between calcium ions and fluoride ions in the hydroxyapatite crystal lattice, stable fluorapatite is generated, rapidly enriching the fluoride ions in the water on the agent surface, thus completing the initial defluorination.

[0022] The V-shaped sedimentation tank 14 at the bottom of the defluorination tank 1 allows for the pre-precipitation of some unsuspended hydroxyapatite particles. The mixed solution enters the microfiltration tank 2 through the bottom inlet 5. An external pump is connected to the outlet 6 of the microfiltration tank 2, providing stable power for the water flow through the microfiltration membrane 9. Under the suction of the external pump, a pressure difference is formed on both sides of the microfiltration membrane 9. Water molecules and small molecules in the mixed solution permeate through the membrane pores under pressure, while the hydroxyapatite particles adsorbed with fluoride ions are effectively retained by the microfiltration membrane 9. The purified water is then pumped by the external pump and finally discharged from the outlet 6.

[0023] During operation, a small amount of chemical particles may adhere to the surface of the microfiltration membrane 9. At this time, the backwashing mechanism 11 is activated, and clean water or gas is introduced in reverse from the permeate side of the membrane to remove the attached contaminants and restore the membrane's filtration performance. The sludge discharge port 7 at the bottom of the microfiltration tank 2 can periodically discharge the deposited chemical sludge. This sludge can be regenerated or disposed of in compliance with regulations as needed to ensure the continuous and stable operation of the device.

[0024] The defluoridation tank 1 and microfiltration tank 2 achieve highly efficient purification of fluoride-containing mine water, avoiding problems such as poor flocculation, sludge runoff, and sand filter clogging caused by uncontrolled PAM parameters, significantly reducing operational difficulty. Since PAM is not used, there is no increase in sludge volume or moisture content due to its addition, resulting in significantly reduced sludge transportation and disposal costs. Simultaneously, it reduces the risk of clogging the filtration system by high-moisture sludge, lowers the frequency and cost of equipment backwashing and maintenance, and extends equipment lifespan. The stirring mechanism 10 within the defluoridation tank 1 ensures sufficient contact between the defluoridating agent and the mine water, improving fluoride ion removal efficiency. The retention effect of the microfiltration membrane 9 further ensures effluent quality, making the treated water more likely to meet standards. The backwashing mechanism 11 cleans the microfiltration membrane 9 promptly, maintaining stable filtration performance.

[0025] According to one embodiment of the present invention, the backwash mechanism 11 includes a flushing pipe 12 and a booster nozzle 13. The booster nozzle 13 is connected to the flushing pipe 12. The flushing pipe 12 is fixedly installed in the microfiltration tank 2 in an arc shape and is located between the microfiltration membrane 9 and the outlet 6. Several booster nozzles 13 are provided and arranged in a rectangular array at the bottom of the flushing pipe 12. The backwash mechanism 11 also includes a water pump. The input end of the water pump is connected to a tap water pipe, and the output end of the water pump is connected to the flushing pipe 12.

[0026] When the flux decreases due to the adhering of chemical particles on the surface of the microfiltration membrane 9, the water pump starts and pressurizes the tap water and delivers it to the flushing pipe 12. The water flows through the booster nozzle 13 to form a high-pressure water column, which is sprayed in reverse from the product water side (i.e. the clean water outflow side) of the microfiltration membrane 9. The water pressure impact removes the hydroxyapatite particles and impurities adhering to the membrane surface. The washed-down particles settle to the bottom of the microfiltration tank 2 with the water flow and are finally discharged through the sludge discharge port 7.

[0027] The bow-shaped arrangement of the flushing pipes 12 and the rectangular array of pressurized nozzles 13 ensure that the water flow can evenly cover the entire surface of the microfiltration membrane 9, avoiding incomplete local flushing and improving the cleaning effect; the high-pressure water flow has a strong impact force, which can quickly remove stubborn particles, effectively restore membrane flux, and reduce backwashing time; tap water is used as the flushing medium, which is convenient and low in cost, and is suitable for long-term stable operation; the stable pressure provided by the water pump makes the backwashing process highly controllable, and the water pressure can be adjusted according to the degree of membrane fouling, balancing the cleaning effect and the risk of membrane damage, and extending the service life of the microfiltration membrane 9.

[0028] According to one embodiment of the present invention, the backwash mechanism 11 includes a flushing pipe 12 and a booster nozzle 13. The booster nozzle 13 is connected to the flushing pipe 12. The flushing pipe 12 is fixedly installed in the microfiltration tank 2 in an arc shape, located between the microfiltration membrane 9 and the outlet 6. Several booster nozzles 13 are arranged in a rectangular array at the bottom of the flushing pipe 12. The backwash mechanism 11 also includes an air pump, the output end of which is connected to the flushing pipe 12. Both the defluorination tank 1 and the microfiltration tank 2 have exhaust ports at their tops. The backwash mechanism 11 also includes several filter screens, which are respectively fixedly installed at the exhaust ports and the input end of the air pump.

[0029] During backwashing, the air pump starts, filters the outside air, pressurizes it and sends it into the flushing pipe 12. The air is then blown back from the water production side of the microfiltration membrane 9 in the form of high-speed airflow through the booster nozzle 13. The shear force of the airflow is used to peel off the chemical particles attached to the membrane surface. The exhaust gas generated by the backwashing is discharged through the exhaust port. The filter screen can prevent external impurities from entering the system or water mist and dust from leaking out of the pool.

[0030] High-pressure airflow purging reduces water consumption and resource depletion, making it particularly suitable for water-scarce mining environments. The airflow has a gentler impact on the membrane surface, reducing physical damage to the microfiltration membrane 9 and further extending its lifespan. The rectangular array of pressurized nozzles 13 ensures uniform airflow coverage of the membrane surface, and combined with the stable air pressure from the air pump, it efficiently removes fine particles. The design of the filter screen and exhaust vents prevents impurity contamination and exhaust gas diffusion, improving the environmental friendliness and safety of the device operation, while also reducing the risk of equipment failure due to impurities clogging the air passages.

[0031] According to one embodiment of the present invention, the stirring mechanism 10 includes a stirring assembly 15 and a driving assembly 16. The stirring assembly 15 includes a rotating shaft 17 and stirring rods 18. The rotating shaft 17 is rotatably connected to the defluorination tank 1. Several stirring rods 18 are arranged in a circular array and fixedly disposed on the side of the rotating shaft 17. The driving assembly 16 is used to rotate the rotating shaft 17. Several groups of stirring assemblies 15 are arranged in a rectangular array within the defluorination tank 1. The driving assembly 16 includes driven wheels 19, driving wheels 20, and a synchronous belt 21. Multiple driven wheels 19 are provided and are coaxially fixedly connected to the rotating shaft 17 of their respective stirring assemblies 15. The driving wheels 20 are rotatably connected to the defluorination tank 1. The synchronous belt 21 is disposed between all driven wheels 19 and driving wheels 20. The driving assembly 16 also includes a driving motor 22, which is fixedly connected to the defluorination tank 1. The output end of the driving motor 22 is coaxially fixedly connected to the driving wheel 20.

[0032] During operation, the drive motor 22 drives the drive wheel 20 to rotate, and synchronously drives all driven wheels 19 to rotate through the synchronous belt 21, so that the shafts 17 and stirring rods 18 of multiple stirring components 15 rotate simultaneously, so as to stir the fluoride-containing mine water and defluorination agent in the defluorination tank 1 in all directions, and promote the agent to fully contact and mix with the water.

[0033] Multiple rectangular arrays of stirring components 15 cover all areas of the defluorination tank 1, avoiding localized mixing dead zones caused by single-unit stirring, ensuring uniform reaction between the defluorination agent and fluoride ions, and improving defluorination efficiency; the synchronous belt 21 drives all stirring rods 18 to rotate at the same speed, ensuring uniform water flow disturbance in the tank and preventing localized deposition of agent particles; the drive motor 22 provides stable power, which, combined with the efficient transmission of the synchronous belt 21, results in low energy consumption and a low failure rate; the annular array design of the stirring rods 18 enhances the turbulence effect of the water flow, accelerates the reaction between the defluorination agent and fluoride-containing mine water, shortens the initial defluorination time, improves the overall treatment efficiency of the device, and adapts to the needs of large-flow mine water treatment.

[0034] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A defluorination device for a mine water film adsorption reactor, characterized in that, The system includes a defluorination tank (1) and a microfiltration tank (2). The top of the defluorination tank (1) is provided with an inlet (3) for adding fluoride-containing mine water and an inlet (4) for adding defluorination agents. The bottom of the defluorination tank (1) is provided with a passage (5) that communicates with the microfiltration tank (2). The top and bottom of the microfiltration tank (2) are provided with an outlet (6) and a sludge discharge outlet (7), respectively. A filter frame (8) is fixedly installed inside the microfiltration tank (2). A microfiltration membrane (9) is fixedly installed on the filter frame (8) and the microfiltration membrane (9) is located between the passage (5) and the outlet (6). The defluorination tank (1) is provided with a stirring mechanism (10) for stirring the fluoride-containing mine water and defluorination agents. The microfiltration tank (2) is provided with a backwashing mechanism (11) for rinsing the microfiltration membrane (9).

2. The defluorination device for a mine water film adsorption reactor as described in claim 1, characterized in that, The backwash mechanism (11) includes a flushing pipe (12) and a booster nozzle (13). The booster nozzle (13) is connected to the flushing pipe (12). The flushing pipe (12) is fixedly installed in the microfiltration tank (2) in an arc shape and is located between the microfiltration membrane (9) and the outlet (6). Several booster nozzles (13) are provided and arranged in a rectangular array at the bottom of the flushing pipe (12).

3. The defluorination device for a mine water film adsorption reactor as described in claim 2, characterized in that, The backwash mechanism (11) also includes a water pump, the input end of which is connected to a tap water pipe, and the output end of which is connected to a flushing pipe (12).

4. The defluorination device for a mine water film adsorption reactor as described in claim 2, characterized in that, The backwash mechanism (11) also includes an air pump, the output end of which is connected to the flushing pipe (12), and the top of the defluorination tank (1) and the microfiltration tank (2) are both provided with exhaust holes.

5. The defluorination device for a mine water film adsorption reactor as described in claim 4, characterized in that, The backflush mechanism (11) also includes a filter screen, which is provided in several parts and is fixedly installed at the exhaust port and the input end of the air pump respectively.

6. The defluorination device for a mine water film adsorption reactor as described in claim 1, characterized in that, The bottom of the defluorination tank (1) is provided with a V-shaped sedimentation tank (14).

7. The defluorination device for a mine water film adsorption reactor as described in claim 1, characterized in that, The stirring mechanism (10) includes a stirring assembly (15) and a driving assembly (16). The stirring assembly (15) includes a rotating shaft (17) and stirring rods (18). The rotating shaft (17) is rotatably connected to the defluorination tank (1). Several stirring rods (18) are provided and are fixedly arranged in a ring array on the side of the rotating shaft (17). The driving assembly (16) is used to rotate the rotating shaft (17).

8. The defluorination device for a mine water film adsorption reactor as described in claim 7, characterized in that, The stirring assembly (15) is provided in several groups and arranged in a rectangular array in the defluorination tank (1). The driving assembly (16) includes a driven wheel (19), a driving wheel (20) and a synchronous belt (21). The driven wheel (19) is provided in multiple ways and is coaxially fixedly connected to the rotating shaft (17) of the corresponding stirring assembly (15). The driving wheel (20) is rotatably connected to the defluorination tank (1). The synchronous belt (21) is arranged between all the driven wheels (19) and the driving wheel (20).

9. The defluorination device for a mine water film adsorption reactor as described in claim 7, characterized in that, The drive assembly (16) also includes a drive motor (22), which is fixedly connected to the defluorination tank (1), and the output end of the drive motor (22) is fixedly connected to the drive wheel (20) on the same axis.

10. The defluorination device for a mine water film adsorption reactor as described in claim 1, characterized in that, The fluoride removal agent is hydroxyapatite.

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