Efficient fluorine removal device

Abstract

The utility model relates to an efficient defluorination device which comprises a main body reaction tank, a defluorination agent dosing tank, a coagulant dosing tank, a flocculant dosing tank, a deacidification pool and a plate-and-frame filter press, a first pump is arranged between the main body reaction tank and the deacidification pool, and fluorine-containing wastewater in the deacidification pool is pumped into the main body reaction tank through the first pump; a water outlet in the bottom of the main body reaction tank is connected with a second pump, and reaction liquid in the main body reaction tank is pumped into the plate-and-frame filter press through the second pump for solid-liquid separation; a tap water opening in the top of the main body reaction tank is connected with a third pump machine, the main body reaction tank is provided with a three-dimensional tank washing device, and tap water is pressurized and pumped into the main body reaction tank through the third pump machine and then completes cleaning of the inner surface of the tank through the three-dimensional tank washing device. According to the high-efficiency fluorine removal device, the fluorine content of fluorine-containing wastewater is effectively reduced by applying a simple chemical precipitation fluorine removal principle, so that the fluorine-containing wastewater is converged into an original sewage treatment system in a factory at a relatively low concentration, and the harm to a rear-end sewage treatment system is reduced.

Description

Technical Field

[0001] This utility model relates to the field of fluoride-containing industrial wastewater treatment technology, specifically a high-efficiency fluoride removal device. Background Technology

[0002] The production of fluoride salts generates a large amount of fluoride-containing wastewater, which is corrosive and highly toxic. If the existing sewage system is used to treat it by mixing it with wastewater from other production lines, it will undoubtedly increase the difficulty and volume of treatment, and may also cause corrosion to subsequent equipment. Therefore, there is an urgent need for a high-efficiency defluorination device to quickly and effectively treat fluoride-containing wastewater without changing the original sewage treatment system, reduce the harm of fluoride-containing wastewater to subsequent treatment systems, and ensure that the wastewater meets discharge standards. Therefore, a high-efficiency defluorination device is proposed to solve the above problems. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a highly efficient defluorination device that significantly reduces the fluoride content in wastewater, has advantages such as small footprint and easy installation, and solves the problems mentioned in the background section.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency defluorination device, comprising a main reaction tank, a defluorinating agent dosing tank, a coagulant dosing tank, a flocculant dosing tank, a deacidification tank, and a plate and frame filter press. A first pump is provided between the main reaction tank and the deacidification tank. Fluoride-containing wastewater in the deacidification tank is pumped into the main reaction tank through the first pump. A second pump is connected to the bottom outlet of the main reaction tank. The reaction liquid in the main reaction tank is pumped into the plate and frame filter press through the second pump for solid-liquid separation. A third pump is connected to the top tap water outlet of the main reaction tank. The main reaction tank is equipped with a three-dimensional tank scrubber. After being pressurized by the third pump and pumped into the main reaction tank, tap water is cleaned on the inner surface of the tank through the three-dimensional tank scrubber.

[0005] Furthermore, the top of the main reaction tank is equipped with a flocculant dosing port, a coagulant dosing port, a fluoride-containing wastewater inlet, and a tap water inlet, and a pipeline mixer is installed at the fluoride-containing wastewater inlet.

[0006] Furthermore, the main reaction vessel is lined with polytetrafluoroethylene, and a flip-top observation window is hinged to the top of the main reaction vessel.

[0007] Furthermore, the plate and frame filter press is equipped with an online fluoride ion detection device at the filtrate discharge port.

[0008] Furthermore, each of the defluorinating agent dosing tank, coagulant dosing tank, and flocculant dosing tank is equipped with a liquid level alarm, which can promptly remind staff to replenish various chemicals. Flow regulators are also installed on the discharge pipes at the bottom of each of the defluorinating agent dosing tank, coagulant dosing tank, and flocculant dosing tank.

[0009] Furthermore, a liquid level sensor is installed inside the main reaction vessel.

[0010] Furthermore, the main reaction tank, the defluorinating agent dosing tank, the coagulant dosing tank, and the flocculant dosing tank are all equipped with stirring devices.

[0011] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0012] 1. This high-efficiency defluoridation device effectively reduces the fluoride content of fluoride-containing wastewater by using a simple chemical precipitation defluorination principle, allowing it to flow into the original sewage treatment system of the plant at a lower concentration, thus reducing the harm to the downstream sewage treatment system.

[0013] 2. This high-efficiency defluoridation device requires simple equipment and only requires pipe connections for assembly. It offers a large operating space and avoids major modifications to the original sewage treatment system, thus keeping construction costs relatively low. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the main reaction vessel structure of this utility model;

[0016] Figure 3 This is a top view of the reaction vessel of this utility model.

[0017] In the diagram: 1. Main reaction tank; 2. Defluoridant dosing tank; 3. Flocculant dosing tank; 4. Coagulant dosing tank; 5. Plate and frame filter press; 6. Pipeline mixer; 7. First pump; 8. Second pump; 9. Third pump; 10. Liquid level sensor; 11. Flow regulator; 12. Liquid level alarm; 13. Stirring device; 14. Tap water inlet; 15. Coagulant dosing port; 16. Flocculant dosing port; 17. Three-dimensional tank washing device; 18. Flip-top observation window; 19. Fluoride-containing wastewater inlet; 20. Deacidification tank. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-3This embodiment of a high-efficiency defluorination device includes a main reaction tank 1, a defluorinating agent dosing tank 2, a coagulant dosing tank 3, a flocculant dosing tank 4, a deacidification tank 20, and a plate and frame filter press 5. A first pump 7 is provided between the main reaction tank 1 and the deacidification tank 20. The fluoride-containing wastewater generated by the fluoride production line is discharged into the deacidification tank for temporary storage and neutralization, so that the acidity and alkalinity of the wastewater reach the optimal defluorination conditions. The fluoride-containing wastewater in the deacidification tank 20 is pumped into the main reaction tank 1 through the first pump 7. The bottom outlet of the main reaction tank 1 is connected to a second pump 8. The reaction liquid in the main reaction tank 1 is pumped into the plate and frame filter press 5 through the second pump 8 for solid-liquid separation.

[0020] Secondly, the main reaction tank 1 is connected to the third pump 9 at the top water inlet. The main reaction tank 1 is equipped with a three-dimensional tank cleaner 17. After the tap water is pressurized by the third pump 9 and pumped into the main reaction tank 1, the three-dimensional tank cleaner 17 completes the cleaning of the inner surface of the tank.

[0021] In this embodiment, the top of the main reaction tank 1 is provided with a flocculant dosing port 16, a coagulant dosing port 15, a fluoride-containing wastewater inlet 19, and a tap water inlet 14, and a pipeline mixer 6 is provided at the fluoride-containing wastewater inlet.

[0022] Furthermore, the lining material of the main reaction tank 1 is polytetrafluoroethylene (PTFE). PTFE is an ideal material resistant to fluorine corrosion, has the best aging life among plastics, and does not easily adhere to other substances. Using this material as the lining can also reduce scaling inside the tank. A hinged flip-top observation window 18 is installed on the top of the main reaction tank 1 for easy observation of the liquid inside. An online fluoride ion detector is installed at the filtrate discharge port of the plate and frame filter press 5. The online fluoride ion detector reflects the actual defluorination status of the fluoride-containing wastewater by detecting the fluoride content in the filtrate. The detection results can be used to determine whether the dosage of defluorinating agent needs to be increased or decreased.

[0023] In this embodiment, each of the defluorinating agent dosing tank 2, the coagulant dosing tank 3, and the flocculant dosing tank 4 is equipped with a liquid level alarm 12, which can promptly remind the staff to replenish various chemicals. A flow regulator 11 is also installed on the discharge pipe at the bottom of the defluorinating agent dosing tank 2, the coagulant dosing tank 3, and the flocculant dosing tank 4. A liquid level sensor 10 is installed in the main reaction tank 1.

[0024] In addition, the main reaction tank 1, the defluorinating agent dosing tank 2, the coagulant dosing tank 3, and the flocculant dosing tank 4 are all equipped with stirring devices 13, which can fully stir the liquids in the main reaction tank 1, the defluorinating agent dosing tank 2, the coagulant dosing tank 3, and the flocculant dosing tank 4.

[0025] The working principle of the above embodiments is as follows:

[0026] Step 1: The first pump 7 is turned on to pump wastewater from the deacidification tank into the main reaction tank 1. The dosing switches for the defluoridating agent, coagulant, and flocculant are turned on simultaneously with the first pump 7. During the wastewater transport process, the defluoridating agent is mixed with the fluoride-containing wastewater through the pipeline mixer 6. The dosage of the defluoridating agent is adjusted based on the actual defluoridation effect. The coagulant and flocculant are added at a constant rate as the wastewater enters the main reaction tank 1, and the dosage can be adjusted according to actual needs.

[0027] Step 2: When the liquid level in the main reaction tank 1 reaches the preset height, the second pump 8 is turned on to transport the fluoride-containing wastewater to the downstream filter press 5 for solid-liquid separation. Under normal conditions, the inflow and outflow of the main reaction tank 1 are kept in dynamic balance, and the liquid level in the main reaction tank 1 is within a safe range.

[0028] When the plate and frame filter press 5 is running close to full load, the liquid level in the main reaction tank 1 rises. When it reaches the warning position, the central control program controls the shutdown of the first pump 7, the second pump 8, and the dosing switches for defluorinating agent, coagulant, and flocculant, stopping the delivery of fluoride-containing waste liquid into the main reaction tank 1 until the plate and frame filter press 5 finishes unloading. It is worth noting that in order to prevent the outlet of the main reaction tank 1 from being blocked, the stirring device 13 in the main reaction tank 1 is always kept on.

[0029] Step 3: After the plate and frame filter press 5 has finished unloading, first turn on the second pump 8 until the liquid level in the main reaction tank 1 drops to the safe level, then turn on the first pump 7 and the dosing switches for defluorinating agent, coagulant, and flocculant to continue defluorination.

[0030] Step 4: After the fluoride-containing wastewater is treated, stop pumping the wastewater and all reagents into the main reaction tank 1. Once the liquid level in the main reaction tank 1 drops to the low level, start the third pump 9 to clean the main reaction tank 1 to prevent residual fluoride-containing wastewater from corroding the instruments and pipes inside the main reaction tank 1.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency defluorination device, characterized in that: The system includes a main reaction tank (1), a defluorinating agent dosing tank (2), a coagulant dosing tank (3), a flocculant dosing tank (4), a deacidification tank (20), and a plate and frame filter press (5). A first pump (7) is provided between the main reaction tank (1) and the deacidification tank (20). Fluoride-containing wastewater in the deacidification tank (20) is pumped into the main reaction tank (1) by the first pump (7). The bottom outlet of the main reaction tank (1) is connected to a second pump (8). The reaction liquid in the main reaction tank (1) is pumped into the plate and frame filter press (5) by the second pump (8) for solid-liquid separation. The top water inlet of the main reaction tank (1) is connected to a third pump (9). The main reaction tank (1) is equipped with a three-dimensional tank cleaner (17). After the tap water is pressurized by the third pump (9) and pumped into the main reaction tank (1), the three-dimensional tank cleaner (17) cleans the inner surface of the tank.

2. The high-efficiency defluorination device according to claim 1, characterized in that: The main reaction tank (1) is equipped with a flocculant dosing port (16), a coagulant dosing port (15), a fluoride wastewater inlet (19), and a tap water inlet (14) at the top. A pipeline mixer (6) is installed at the fluoride wastewater inlet.

3. The high-efficiency defluorination device according to claim 1, characterized in that: The main reaction vessel (1) is lined with polytetrafluoroethylene, and the top of the main reaction vessel (1) is hinged with a flip-top observation window (18).

4. The high-efficiency defluorination device according to claim 1, characterized in that: The plate and frame filter press (5) is equipped with an online fluoride ion detection device at the filtrate discharge port.

5. The high-efficiency defluorination device according to claim 1, characterized in that: The defluorinating agent dosing tank (2), coagulant dosing tank (3), and flocculant dosing tank (4) are all equipped with level alarms (12) to promptly remind staff to replenish various chemicals. Flow regulators (11) are also installed on the discharge pipes at the bottom of the defluorinating agent dosing tank (2), coagulant dosing tank (3), and flocculant dosing tank (4).

6. The high-efficiency defluorination device according to claim 1, characterized in that: A liquid level sensor (10) is installed inside the main reaction vessel (1).

7. The high-efficiency defluorination device according to claim 1, characterized in that: The main reaction tank (1), the defluorinating agent dosing tank (2), the coagulant dosing tank (3), and the flocculant dosing tank (4) are all equipped with stirring devices (13).

Images