Fluorine recycling device for fluorine-containing waste acid

Abstract

The utility model discloses a fluorine recycling device for fluorine-containing waste acid, which relates to the technical field of fluorine-containing waste acid treatment and comprises a first reaction tank, a second reaction tank, a third reaction tank and a dissolved gas reactor which are arranged in a line. Water pumps are installed in the first reaction tank, the second reaction tank and the third reaction tank, the output ends of the water pumps are fixedly connected with conveying pipes, the conveying pipes are connected to a next-stage device, discharging openings are formed in the bottom ends of the first reaction tank, the second reaction tank, the third reaction tank and the dissolved gas reactor, and a recycling pipe is fixedly connected to the top of the left end of the first reaction tank. According to the device disclosed by the utility model, the generation of gypsum (CaSO4. 2H2O) and CaF2 products can be effectively controlled in the technological process, and the sustainable development of the ecological environment and fluorine chemical industry is ensured.

Description

Technical Field

[0001] This utility model relates to the field of fluorine-containing waste acid treatment technology, specifically a fluorine recycling device for fluorine-containing waste acid. Background Technology

[0002] The fluorochemical industry generates a large amount of high-fluorine-content waste acid solutions during production, which also contain small amounts of heavy metals and are difficult to treat. Fluorine resources are non-renewable resources. If suitable and efficient resource-based treatment technologies can be found, the recycling and reuse of fluorine resources can be achieved through the treatment of fluorine-containing waste acid, which is of great significance to the ecological environment and the sustainable development of the fluorine industry.

[0003] Existing treatment processes, including chemical precipitation, coagulation sedimentation, adsorption, and electrodialysis, suffer from problems such as difficulty in achieving effluent standards, slow sludge settling and dewatering, high alkali consumption, high production costs, and large pH fluctuations and unstable water quality. Furthermore, they do not consider the resource utilization of fluoride in waste acid and treat it directly as waste.

[0004] To address the aforementioned issues, we have made improvements and proposed a device for the recycling of fluorine-containing waste acid. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] This utility model provides a device for the recycling of fluorine-containing waste acid, comprising a first reaction tank, a second reaction tank, a third reaction tank, and a dissolved gas reactor. The device is characterized in that the first reaction tank, the second reaction tank, the third reaction tank, and the dissolved gas reactor are arranged in a line. Each of the first reaction tank, the second reaction tank, and the third reaction tank is equipped with a water pump. The output end of each water pump is fixedly connected to a delivery pipe, which is connected to the next stage device. Each of the first reaction tank, the second reaction tank, the third reaction tank, and the dissolved gas reactor has a discharge port at its bottom. A recovery pipe is fixedly connected to the top left end of the first reaction tank, and a gas collection device is installed at the end of the recovery pipe. A recovery box is fixedly connected to the bottom end of the discharge port at the bottom of the second reaction tank.

[0007] As a preferred embodiment of this utility model, the first reaction tank, the second reaction tank, the third reaction tank, and the dissolved gas reactor are all rotatably connected to the left and right sides of the interior, and a sieve plate is fixedly connected to the outside of the mounting shaft. An electric motor is installed at the rear end of the mounting shaft.

[0008] As a preferred embodiment of this invention, the top of the gas collection device is equipped with a connecting pipe, and the end of the connecting pipe is connected to the top of the dissolved gas reactor.

[0009] As a preferred embodiment of this utility model, a filter plate is hinged inside the recycling bin, a telescopic electric cylinder is fixedly connected to the bottom of the recycling bin, and the output end of the telescopic electric cylinder abuts against the filter plate. Electric heaters are installed on both the front and rear sides inside the recycling bin, and a discharge port is opened on the right side of the recycling bin.

[0010] As a preferred embodiment of this utility model, a stirrer is installed inside the first reaction tank, the second reaction tank, and the third reaction tank. A spray device and an aeration disc are provided inside the dissolved gas reactor. The spray device is connected to the end of the conveying pipe at the output end of the third reaction tank, and the aeration disc is connected to the end of the connecting pipe.

[0011] The beneficial effects of this utility model are:

[0012] 1. This utility model can effectively control the generation of gypsum (CaSO4·2H2O) and CaF2 products during the process, ensuring the sustainable development of the ecological environment and fluorochemical industry.

[0013] 2. With this utility model, byproducts such as CO2 and CaCO3 generated during the process can be recycled and reused, reducing waste generation and improving resource utilization efficiency.

[0014] 3. This utility model, utilizing this process and equipment, can ensure both efficient recovery of fluoride resources and compliance with effluent standards. The entire process can be implemented using modular equipment, making it highly efficient and convenient. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the recycling bin of this utility model;

[0018] Figure 3 This is a flowchart of the present invention;

[0019] In the diagram: 1. First reaction tank; 2. Second reaction tank; 3. Third reaction tank; 4. Dissolved gas reactor; 5. Gas collection device; 6. Recovery box; 7. Discharge port; 8. Mounting shaft; 9. Sieve plate; 10. Water pump; 11. Conveying pipe; 12. Recovery pipe; 13. Connecting pipe; 14. Aeration disc; 15. Spraying device; 16. Telescopic electric cylinder; 17. Filter plate; 18. Electric heater; 19. Discharge port. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] Example: Figure 1-3 As shown, a fluorine-containing waste acid fluorine recycling device includes a first reaction tank 1, a second reaction tank 2, a third reaction tank 3, and a dissolved gas reactor 4. The first reaction tank 1, second reaction tank 2, third reaction tank 3, and dissolved gas reactor 4 are arranged in a line. Each of the first reaction tank 1, second reaction tank 2, and third reaction tank 3 is equipped with a water pump 10. The output end of the water pump 10 is fixedly connected to a conveying pipe 11, which is connected to the next stage device. Each of the first reaction tank 1, second reaction tank 2, third reaction tank 3, and dissolved gas reactor 4 has a discharge port 7 at its bottom. A recovery pipe 12 is fixedly connected to the top left end of the first reaction tank 1, and a gas collection device 5 is installed at the end of the recovery pipe 12. A recovery box 6 is fixedly connected to the bottom end of the discharge port 7 at the bottom of the second reaction tank 2. The first reaction tank 1, the second reaction tank 2, and the third reaction tank 3 are all equipped with agitators. The dissolved gas reactor 4 is equipped with a spray device 15 and an aeration plate 14. The spray device 15 is connected to the end of the conveying pipe 11 at the output end of the third reaction tank 3, and the aeration plate 14 is connected to the end of the connecting pipe 13. Solenoid valves are installed at the feed inlets of the first reaction tank 1, the second reaction tank 2, the third reaction tank 3, and the dissolved gas reactor 4. pH sensors are installed inside the first reaction tank 1, the second reaction tank 2, the third reaction tank 3, and the dissolved gas reactor 4. The output end of the pH sensor is electrically connected to the input end of the solenoid valve. The amount of material added at the feed inlet is controlled by the pH value inside the first reaction tank 1, the second reaction tank 2, the third reaction tank 3, and the dissolved gas reactor 4 to keep the reaction within a suitable pH value.

[0022] Fluorine-containing waste acid solution is added to the first reaction tank 1. CaCO3 is added to the first reaction tank 1, and the reaction pH is controlled between 1.5 and 2.0. After the reaction is complete, solid and liquid are separated to obtain gypsum (CaSO4·2H2O). The clear liquid is further processed. The CO2 generated by the reaction enters the gas collection device 5 through the recovery pipe 12.

[0023] First, NaOH is added to the second reaction vessel 2, followed by Ca(OH)2. The pH is controlled between 2.0 and 4.5. After the reaction, the solution is separated into solid and liquid to obtain CaF2. The clear liquid is then further processed.

[0024] Ca(OH)2 solution is added to the third reaction tank 3, and the pH is controlled between 11.0 and 11.5 to carry out the reaction, ensuring that heavy metal impurities in the solution are completely removed. After solid-liquid separation, the solid waste is transported off-site for treatment, and the clear liquid is further processed.

[0025] The solution is treated by introducing CO2 into the dissolved gas reactor 4, which removes excess Ca from the solution. 2+ CaCO3 precipitate is formed, and the pH is lowered to ensure that the pH value is between 6 and 9. After solid-liquid separation, the precipitated CaCO3 is recovered at the front end, and the clear liquid is reused or discharged from the system after meeting the standards.

[0026] Liquid is transported between two adjacent containers via a water pump 10 and a delivery pipe 11.

[0027] Specifically, such as Figure 1 As shown, the first reaction tank 1, the second reaction tank 2, the third reaction tank 3, and the dissolved gas reactor 4 are all rotatably connected to the left and right sides of the interior. The outside of the mounting shaft 8 is fixedly connected to the sieve plate 9. The rear end of the mounting shaft 8 is equipped with a motor. The motor is a forward and reverse motor and has an internal controller to control the rotation of the motor. The two sieve plates 9 divide the device into upper and lower parts, realizing solid-liquid separation in the container, which facilitates the liquid to flow to the next process. After the liquid is completely discharged, the motor drives the mounting shaft 8 to rotate, thereby opening the sieve plate 9, allowing the solid to fall to the bottom of the container and then be discharged from the outlet 7. The reciprocating rotation of the motor can make the sieve plate 9 vibrate, shaking off the solid on the sieve plate 9.

[0028] Specifically, such as Figure 1 As shown, a connecting pipe 13 is installed at the top of the gas collection device 5, and the end of the connecting pipe 13 is connected to the top of the dissolved gas reactor 4. The CO2 generated in the first reaction tank 1 is collected by the gas collection device 5 and then sent into the dissolved gas reactor 4 through the connecting pipe 13 for reaction, so as to realize recycling, reduce waste generation, and improve resource utilization efficiency.

[0029] Specifically, such as Figure 2 As shown, a filter plate 17 is hinged inside the recovery box 6. A telescopic electric cylinder 16 is fixedly connected to the bottom of the recovery box 6, and the output end of the telescopic electric cylinder 16 abuts against the filter plate 17. Electric heaters 18 are installed on both the front and rear sides of the recovery box 6. A discharge port 19 is opened on the right side of the recovery box 6. Calcium fluoride produced by the second reaction tank 2 enters the recovery box 6 through the discharge port 7 and falls onto the filter plate 17. Moisture falls to the bottom of the recovery box 6 through the filter plate 17. Then, the electric heater 18 is turned on to dry the calcium fluoride. After drying, the telescopic electric cylinder 16 extends to tilt the filter plate 17 and open the discharge port 19, so that the calcium fluoride is removed from the recovery box 6.

[0030] Working principle: Fluorine-containing waste acid solution is added to the first reaction tank 1. CaCO3 is added to the first reaction tank 1. By controlling the amount of CaCO3 added, the reaction pH is kept between 1.5 and 2.0. After the reaction is complete, solid and liquid are separated to obtain gypsum (CaSO4·2H2O). The clear liquid is further processed. The CO2 generated in the reaction enters the gas collection device 5 through the recovery pipe 12.

[0031] First, NaOH is added to the second reaction vessel 2, followed by Ca(OH)2. The pH is controlled between 2.0 and 4.5. After the reaction, the solution is separated into solid and liquid to obtain CaF2. The clear liquid is then further processed.

[0032] Ca(OH)2 solution is added to the third reaction tank 3, and the pH is controlled between 11.0 and 11.5 to carry out the reaction, ensuring that heavy metals and other impurities in the solution are completely removed. After solid-liquid separation, the solid waste is transported off-site for treatment, and the clear liquid is further processed.

[0033] The solution is treated by introducing CO2 into the dissolved gas reactor 4, which removes excess Ca from the solution. 2+ CaCO3 precipitate is formed, and the pH is lowered to ensure that the pH value is between 6 and 9. After solid-liquid separation, the precipitated CaCO3 is recovered at the front end, and the clear liquid is reused or discharged from the system after meeting the standards.

[0034] The calcium fluoride produced in the second reaction tank 2 enters the recovery tank 6 through the outlet 7 and falls onto the filter plate 17. The moisture falls through the filter plate 17 to the bottom of the recovery tank 6. Then the electric heater 18 is turned on to dry the calcium fluoride. After drying, the telescopic electric cylinder 16 extends to tilt the filter plate 17 and open the discharge port 19, so that the calcium fluoride is removed from the recovery tank 6.

[0035] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for recycling fluorine-containing waste acid, comprising a first reaction tank (1), a second reaction tank (2), a third reaction tank (3), and a dissolved gas reactor (4), characterized in that, The first reaction tank (1), the second reaction tank (2), the third reaction tank (3) and the dissolved gas reactor (4) are arranged in a row. The first reaction tank (1), the second reaction tank (2) and the third reaction tank (3) are all equipped with water pumps (10). The output end of the water pump (10) is fixedly connected to a conveying pipe (11), and the conveying pipe (11) is connected to the next stage device. The bottom end of the first reaction tank (1), the second reaction tank (2), the third reaction tank (3) and the dissolved gas reactor (4) are all provided with an outlet (7). The top left end of the first reaction tank (1) is fixedly connected to a recovery pipe (12). The end of the recovery pipe (12) is equipped with a gas collection device (5). The bottom end of the outlet (7) at the bottom of the second reaction tank (2) is fixedly connected to a recovery box (6).

2. The fluorine recycling device for fluorine-containing waste acid according to claim 1, characterized in that, The first reaction vessel (1), the second reaction vessel (2), the third reaction vessel (3) and the dissolved gas reactor (4) are all rotatably connected to the left and right sides of the interior. A sieve plate (9) is fixedly connected to the outside of the mounting shaft (8), and an electric motor is installed at the rear end of the mounting shaft (8).

3. The fluorine recycling device for fluorine-containing waste acid according to claim 1, characterized in that, The gas collection device (5) is equipped with a connecting pipe (13) at its top end, and the end of the connecting pipe (13) is connected to the top of the dissolved gas reactor (4).

4. The fluorine recycling device for fluorine-containing waste acid according to claim 1, characterized in that, The recycling box (6) is hinged with a filter plate (17) inside. A telescopic electric cylinder (16) is fixedly connected to the bottom of the recycling box (6), and the output end of the telescopic electric cylinder (16) abuts against the filter plate (17). Electric heaters (18) are installed on both the front and rear sides of the inside of the recycling box (6). A discharge port (19) is opened on the right side of the recycling box (6).

5. The fluorine recycling device for fluorine-containing waste acid according to claim 1, characterized in that, The first reaction tank (1), the second reaction tank (2), and the third reaction tank (3) are all equipped with a stirrer. The dissolved gas reactor (4) is equipped with a spray device (15) and an aeration disc (14). The spray device (15) is connected to the end of the conveying pipe (11) at the output end of the third reaction tank (3), and the aeration disc (14) is connected to the end of the connecting pipe (13).

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