Waste water recycling device for hydrogen fluoride production line

Abstract

A wastewater recycling device for a hydrogen fluoride production line is characterized in that a water outlet of a recycling water tank is connected to a spiral humidifying distributor through a connecting pipeline, the recycling water tank is sequentially provided with a primary reaction tank, a primary sedimentation tank, a secondary reaction tank, a secondary sedimentation tank and a fluorine removal agent adding tank from top to bottom, the primary reaction tank is located at a water inlet of the recycling water tank, and the secondary reaction tank is located at a water outlet of the recycling water tank. The first-stage reaction tank is communicated with the first-stage sedimentation tank, the first-stage sedimentation tank is communicated with the second-stage reaction tank, the second-stage reaction tank is communicated with the second-stage sedimentation tank, and the second-stage sedimentation tank is connected with the spiral humidification distributor through the fluorine removal agent adding tank. The wastewater recycling device for the hydrogen fluoride production line has the beneficial effects that the wastewater recycling device for the hydrogen fluoride production line can realize all recycling of production wastewater of hydrogen fluoride production enterprises, not only solves the problems that gypsum slag is easy to raise dust in the loading process due to high temperature and small granularity and dangerous wastes are avoided, but also realizes zero discharge of the production wastewater of the hydrogen fluoride production enterprises; and the unorganized emission of dust is reduced.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to a wastewater reuse device for a hydrogen fluoride production line. Background Technology

[0002] The production of hydrogen fluoride generates a large amount of wastewater. Currently, the wastewater from hydrogen fluoride production in my country is directly discharged after treatment and cannot be reused. The water utilization rate is low, zero discharge has not been achieved, and the best environmental benefits have not been reached.

[0003] With the increasing total discharge of fluoride from wastewater, the environmental capacity of water bodies in some areas is approaching its limit. Therefore, some provinces and cities have successively introduced stricter wastewater discharge policies in recent years. For example, Fujian Province issued a notice entitled "Measures for Deepening the Comprehensive Management of the Ecological Environment in the Minjiang River Basin," which mentions "promoting the implementation of special emission limits for water pollutants in industries such as fluorochemicals, dyeing and printing, and electroplating" and "completing the construction of zero-direct-discharge zones for wastewater in chemical industrial parks and provincial-level or above development zones in the Minjiang River Basin by the end of 2025." Therefore, fluorochemical enterprises must further treat fluoride-containing wastewater to reduce the concentration of fluoride in the wastewater and decrease wastewater discharge. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings and defects in the existing technology by providing a wastewater reuse device for hydrogen fluoride production lines. This wastewater reuse device can realize the complete reuse of production wastewater from hydrogen fluoride production enterprises. It not only solves the problem of dust generation during the loading process of gypsum slag due to its high temperature and small particle size, but also avoids the generation of hazardous waste. Furthermore, it achieves zero discharge of production wastewater from hydrogen fluoride production enterprises and reduces fugitive dust emissions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a wastewater reuse device for a hydrogen fluoride production line, comprising a reuse water tank, wherein the inlet and outlet of the reuse water tank are both equipped with connecting pipes 3, and the inlet of the reuse water tank is connected to an regulating tank 1 via the connecting pipes 3, and the outlet of the reuse water tank is connected to a spiral humidifier distributor 10 via the connecting pipes 3. The reuse water tank is provided with a primary reaction tank 4, a primary sedimentation tank 5, a secondary reaction tank 6, a secondary sedimentation tank 7, and a defluorinating agent dosing tank 8 in sequence from top to bottom. The primary reaction tank 4 is located at the inlet of the reuse water tank, and the primary reaction tank 4 is connected to its primary sedimentation tank 5. The primary sedimentation tank 5 is connected to the secondary reaction tank 6, and the secondary reaction tank 6 is connected to its secondary sedimentation tank 7. The secondary sedimentation tank 7 is connected to its spiral humidifier distributor 10 via the defluorinating agent dosing tank 8.

[0006] Furthermore, a first water pump 2 is installed on the connecting pipe 3 between the regulating tank 1 and the reclaimed water tank.

[0007] Furthermore, a second water pump 9 is installed on the connecting pipe 3 between the spiral humidifier distributor 10 and the recycled water tank.

[0008] Furthermore, the spiral humidifier distributor 10 includes a spiral humidifier section 10-3, one end of which is mechanically connected to a power motor 10-1, and a humidifier distributor 10-5 is provided on one side of the spiral humidifier section 10-3. An inlet 10-2 is provided above one side of the spiral humidifier section 10-3, and an outlet 10-4 is provided below the other side of the spiral humidifier section 10-3.

[0009] Furthermore, the equalization tank 1 contains wastewater of three different qualities: hydrofluoric acid, fluoride, and fluorosilicic acid.

[0010] After adopting the above technical solution, the beneficial effects of this utility model are as follows: This hydrogen fluoride production line wastewater reuse device and method has at least the following advantages:

[0011] 1. By treating fluoride-containing production wastewater with fluoride, all production wastewater from hydrogen fluoride production enterprises can be reused;

[0012] 2. The production wastewater is recycled for cooling, humidifying, and neutralizing the by-product gypsum slag to increase its pH value, which solves the problem of dust generation during loading of gypsum slag due to its high temperature and small particle size, and avoids the generation of hazardous waste.

[0013] 3. It has achieved zero discharge of production wastewater from hydrogen fluoride production enterprises and reduced fugitive dust emissions. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the spiral humidifier distributor in this utility model.

[0017] Explanation of reference numerals in the attached diagram: 1. Equalization tank; 2. First water pump; 3. Connecting pipe; 4. Primary reaction tank; 5. Primary sedimentation tank; 6. Secondary reaction tank; 7. Secondary sedimentation tank; 8. Defluoridant dosing tank; 9. Second water pump; 10. Spiral humidifier distributor; 10. Power motor; 10-1. Feed inlet; 10-2. Spiral humidification section; 10-3. Discharge outlet; 10-4. Humidifier distributor; 10-5. Detailed Implementation

[0018] See Figures 1-2 As shown, the technical solution adopted in this specific embodiment is as follows: It includes a recycled water tank, with connecting pipes 3 installed at both the inlet and outlet of the recycled water tank. The inlet of the recycled water tank is connected to an equalization tank 1 via the connecting pipe 3, and the outlet of the recycled water tank is connected to a spiral humidifier distributor 10 via the connecting pipe 3. The recycled water tank is provided with a primary reaction tank 4, a primary sedimentation tank 5, a secondary reaction tank 6, a secondary sedimentation tank 7, and a defluorinating agent dosing tank 8 in sequence from top to bottom. The primary reaction tank 4 is located at the inlet of the recycled water tank. The primary reaction tank 4 is connected to its primary sedimentation tank 5. The primary sedimentation tank 5 is connected to the secondary reaction tank 6, and the secondary reaction tank 6 is connected to its secondary sedimentation tank 7. The secondary sedimentation tank 7 is connected to its spiral humidifier distributor 10 via the defluorinating agent dosing tank 8.

[0019] More specifically, a first water pump 2 is installed on the connecting pipe 3 between the equalization tank 1 and the reclaimed water tank. The first water pump 2 is capable of transporting the pretreated wastewater to the reclaimed water tank.

[0020] More specifically, a second water pump 9 is installed on the connecting pipe 3 between the spiral humidifier distributor 10 and the reclaimed water tank. The second water pump 9 can transport the treated wastewater from the reclaimed water tank to the spiral humidifier distributor 10.

[0021] More specifically, the spiral humidifier distributor 10 includes a spiral humidifier section 10-3, one end of which is mechanically connected to a power motor 10-1, and a humidifier distributor 10-5 is provided on one side of the spiral humidifier section 10-3. An inlet 10-2 is provided above one side of the spiral humidifier section 10-3, and an outlet 10-4 is provided below the other side of the spiral humidifier section 10-3.

[0022] More specifically, equalization tank 1 contains wastewater of three different qualities: hydrofluoric acid, fluoride, and fluorosilicic acid. The equalization tank 1 is used for homogenization and equalization treatment to stabilize the water volume and quality, providing stable and optimized operating conditions for subsequent water treatment processes.

[0023] The working principle of this invention is as follows: Wastewater containing three different water qualities—hydrofluoric acid, fluoride, and fluorosilicic acid—is transported to equalization tank 1 for homogenization and adjustment, stabilizing the water volume and quality to provide stable and optimized operating conditions for subsequent water treatment processes. Preliminary treatment is then performed in primary reaction tank 4 and primary sedimentation tank 5. A dual-calcium method combined with coagulation and secondary sedimentation is used to remove most of the fluoride ions from the water. A deep defluorination process is then implemented to further remove fluoride ions, reducing the effluent fluoride concentration to below 1.5 mg / L. Secondary treatment is then performed in secondary reaction tank 6 and secondary sedimentation tank 7. Since the fluoride-containing wastewater is defluorinated using the calcium method, fluorides exist in the form of calcium fluoride. The by-product gypsum slag mainly consists of calcium sulfate and calcium fluoride. Due to their similar composition, the wastewater treated by the spiral humidifier distributor 10 is reused for cooling, humidifying, dust suppression, and neutralizing the pH value of the high-temperature by-product gypsum slag, thereby improving water utilization and achieving zero discharge.

[0024] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A wastewater reuse device for a hydrogen fluoride production line, characterized in that: It includes a recycled water tank, with connecting pipes (3) installed at both the inlet and outlet of the recycled water tank. The inlet of the recycled water tank is connected to an regulating tank (1) via the connecting pipe (3), and the outlet of the recycled water tank is connected to a spiral humidifier distributor (10) via the connecting pipe (3). The recycled water tank is provided with a primary reaction tank (4), a primary sedimentation tank (5), a secondary reaction tank (6), a secondary sedimentation tank (7), and a defluorinating agent dosing tank (8) in sequence from top to bottom. The primary reaction tank (4) is located at the inlet of the recycled water tank. The primary reaction tank (4) is connected to its primary sedimentation tank (5). The primary sedimentation tank (5) is connected to the secondary reaction tank (6), and the secondary reaction tank (6) is connected to its secondary sedimentation tank (7). The secondary sedimentation tank (7) is connected to its spiral humidifier distributor (10) via the defluorinating agent dosing tank (8).

2. The wastewater reuse device for a hydrogen fluoride production line according to claim 1, characterized in that: A first water pump (2) is installed on the connecting pipe (3) between the regulating tank (1) and the reclaimed water tank.

3. The wastewater reuse device for a hydrogen fluoride production line according to claim 1, characterized in that: A second water pump (9) is installed on the connecting pipe (3) between the spiral humidifier distributor (10) and the recycled water tank.

4. The wastewater reuse device for a hydrogen fluoride production line according to claim 1, characterized in that: The spiral humidifier distributor (10) includes a spiral humidifier section (10-3), one end of which is mechanically connected to a power motor (10-1), and a humidifier distributor (10-5) is provided on one side of the spiral humidifier section (10-3). A feed inlet (10-2) is provided above one side of the spiral humidifier section (10-3), and a discharge outlet (10-4) is provided below the other side of the spiral humidifier section (10-3).

5. The wastewater reuse device for a hydrogen fluoride production line according to claim 1, characterized in that: The regulating tank (1) contains wastewater of three different qualities: hydrofluoric acid, fluoride, and fluorosilicic acid.

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