Device and method for recycling wastewater of hydrogen fluoride production line

Abstract

According to the hydrogen fluoride production line wastewater recycling device and method, a water outlet of a recycling water tank is connected to a spiral humidification distributor through a connecting pipeline, the recycling water tank is sequentially provided with a first-stage reaction tank, a first-stage sedimentation tank, a second-stage reaction tank, a second-stage sedimentation tank and a fluorine removal agent adding tank from top to bottom, the first-stage reaction tank is located at a water inlet of the recycling water tank, and the second-stage sedimentation 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 hydrogen fluoride production line wastewater recycling device has the beneficial effects that the hydrogen fluoride production line wastewater recycling device can realize all recycling of production wastewater of hydrogen fluoride production enterprises, not only solves the problem that gypsum slag is easy to raise dust in the loading process due to high temperature and small granularity and avoids generation of hazardous wastes, 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] The invention relates to the technical field of water treatment, and in particular to a wastewater recycling device and method for a hydrogen fluoride production line. Background Art

[0002] A large amount of wastewater will be generated during the production of hydrogen fluoride. At present, 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 emission is not achieved, and the optimal environmental protection benefits are not achieved.

[0003] With the increasing total amount of fluoride discharged from sewage, the water environment capacity in some areas is close to the limit. Therefore, some provinces and cities have successively introduced more stringent wastewater discharge policies in recent years. For example, Fujian Province issued a notice on "Measures for Deepening the Comprehensive Management of the Ecological Environment in the Minjiang River Basin", which mentioned "promoting the implementation of special water pollutant emission limits in the fluorine chemical industry, printing and dyeing, and electroplating industries" and "before the end of 2025, the construction of zero direct discharge areas for sewage in chemical parks and development zones at or above the provincial level in the Minjiang River Basin will be completed in full". Therefore, fluorine chemical companies must further treat fluorine-containing wastewater in depth, reduce the concentration of fluoride in wastewater, and reduce wastewater discharge. Summary of the invention

[0004] The purpose of the present invention is to provide a wastewater recycling device and method for a hydrogen fluoride production line in view of the shortcomings and defects in the prior art. The wastewater recycling device for a hydrogen fluoride production line can realize the full recycling of production wastewater of a hydrogen fluoride production enterprise, which not only solves the problem that gypsum slag is easy to generate dust during the loading process due to its high temperature and small particle size and avoids the generation of hazardous waste, but also realizes zero discharge of production wastewater of the hydrogen fluoride production enterprise and reduces the unorganized emission of dust.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a device and method for recycling wastewater from a hydrogen fluoride production line, which includes a recycling water pool, the water inlet and the water outlet of the recycling water pool are both equipped with connecting pipes 3, and the water inlet of the recycling water pool is connected to a regulating tank 1 through the connecting pipe 3, and the water outlet of the recycling water pool is connected to a spiral humidifying distributor 10 through the connecting pipe 3, and the recycling water pool 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 from top to bottom, the primary reaction tank 4 is located at the water inlet of the recycling water pool, 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, and the secondary sedimentation tank 7 is connected to its spiral humidifying distributor 10 through 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 reuse water tank.

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

[0008] Furthermore, the spiral humidification distributor 10 includes a spiral humidification section 10-3, one end of the spiral humidification section 10-3 is mechanically connected to a power motor 10-1, and a humidification distributor 10-5 is provided on one side of the spiral humidification section 10-3, a feed port 10-2 is provided above one side of the spiral humidification section 10-3, and a discharge port 10-4 is provided below the other side of the spiral humidification section 10-3.

[0009] Furthermore, the regulating tank 1 contains wastewater of three different water qualities: hydrofluoric acid, fluoride salt, and fluosilicic acid.

[0010] A method for recycling wastewater from a hydrogen fluoride production line, characterized in that it includes the following specific operation methods: transporting wastewater containing hydrofluoric acid, fluoride salt and fluosilicic acid of three different water qualities to a regulating tank (1) for homogenization and regulation treatment to make the water quantity and water quality relatively stable, thereby providing a stable and optimized operating condition for subsequent water treatment processes; performing preliminary treatment in a primary reaction tank 4 and a primary sedimentation tank 5; and performing secondary treatment in a secondary reaction tank 6 and a secondary sedimentation tank 7; defluoridating the fluorine-containing wastewater by a calcium method, so that fluoride exists in the form of calcium fluoride, and the by-product gypsum slag mainly contains calcium sulfate and calcium fluoride. Since the two have similar components, the treated wastewater is recycled by a spiral humidification distributor (10) for cooling, humidifying, dust suppression and neutralization of the high-temperature by-product gypsum slag to increase the pH value, thereby improving the utilization rate of water and achieving zero discharge.

[0011] After adopting the above technical scheme, the beneficial effects of the present invention are: the wastewater recycling device and method of the hydrogen fluoride production line have at least the following advantages:

[0012] 1. After the fluorine-containing production wastewater is deeply treated by fluorination, all the production wastewater of hydrogen fluoride production enterprises can be reused;

[0013] 2. The production wastewater is reused to cool and humidify the by-product gypsum slag and neutralize it to increase the pH value, which solves the problem of gypsum slag being prone to dust during loading due to its high temperature and small particle size, and avoids the generation of hazardous waste.

[0014] 3. It has achieved zero wastewater discharge from hydrogen fluoride production enterprises and reduced unorganized dust emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the spiral humidifying distributor in the present invention.

[0018] Explanation of the reference numerals: regulating tank 1, first water pump 2, connecting pipe 3, primary reaction tank 4, primary sedimentation tank 5, secondary reaction tank 6, secondary sedimentation tank 7, defluorination agent dosing tank 8, second water pump 9, spiral humidification distributor 10, power motor 10-1, feed inlet 10-2, spiral humidification section 10-3, discharge port 10-4, humidification distributor 10-5. DETAILED DESCRIPTION

[0019] See also Figure 1-Figure 2 As shown, the technical solution adopted in this specific embodiment is: it includes a reuse water pool, the water inlet and the water outlet of the reuse water pool are both installed with connecting pipes 3, and the water inlet of the reuse water pool is connected to the regulating tank 1 through the connecting pipe 3, and the water outlet of the reuse water pool is connected to the spiral humidification distributor 10 through the connecting pipe 3. The reuse water pool 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 defluorination agent dosing tank 8 from top to bottom. The primary reaction tank 4 is located at the water inlet of the reuse water pool, 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, and the secondary sedimentation tank 7 is connected to its spiral humidification distributor 10 through the defluorination agent dosing tank 8.

[0020] More specifically, a first water pump 2 is installed on the connecting pipe 3 between the regulating tank 1 and the reuse water tank. The first water pump 2 can transport the pre-treated wastewater to the reuse water tank.

[0021] More specifically, a second water pump 9 is installed on the connecting pipe 3 between the spiral humidification distributor 10 and the reuse water tank. The second water pump 9 can transport the wastewater treated in the reuse water tank to the spiral humidification distributor 10.

[0022] More specifically, the spiral humidification distributor 10 includes a spiral humidification section 10-3, one end of the spiral humidification section 10-3 is mechanically connected to a power motor 10-1, and a humidification distributor 10-5 is provided on one side of the spiral humidification section 10-3, a feed port 10-2 is provided above one side of the spiral humidification section 10-3, and a discharge port 10-4 is provided below the other side of the spiral humidification section 10-3.

[0023] More specifically, the regulating tank 1 contains three wastewaters of different water qualities, namely, hydrofluoric acid, fluoride salt, and fluosilicic acid. The regulating tank 1 is used for equalization and regulation to stabilize the water quantity and quality, thus providing a stable and optimized operating condition for the subsequent water treatment process.

[0024] A method for a wastewater recycling device for a hydrogen fluoride production line, characterized in that it includes the following specific operating methods:

[0025] 1) The wastewater containing hydrofluoric acid, fluoride salt and fluosilicic acid of three different water qualities is transported to the regulating tank (1) for equalization and regulation treatment to make the water quantity and water quality relatively stable, thereby providing a stable and optimized operating condition for the subsequent water treatment process;

[0026] 2) preliminary treatment through a primary reaction tank (4) and a primary sedimentation tank (5);

[0027] 3) performing secondary treatment in a secondary reaction tank (6) and a secondary sedimentation tank (7);

[0028] 4) Fluoride-containing wastewater is defluorinated by calcium method, so fluoride exists in the form of calcium fluoride. The by-product gypsum slag is mainly composed of calcium sulfate and calcium fluoride. Since the two have similar compositions, the treated wastewater is reused by spiral humidification distributor (10) to cool and humidify the high-temperature by-product gypsum slag, suppress dust, and neutralize and increase the pH value, thereby improving water utilization and achieving zero emission.

[0029] The above is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A device and method for recycling wastewater from a hydrogen fluoride production line, characterized in that: The invention comprises a reuse water pool, wherein the water inlet and the water outlet of the reuse water pool are both provided with connecting pipes (3), and the water inlet of the reuse water pool is connected to a regulating pool (1) through the connecting pipe (3), and the water outlet of the reuse water pool is connected to a spiral humidifying distributor (10) through the connecting pipe (3). The reuse water pool is provided with a primary reaction pool (4), a primary sedimentation pool (5), a secondary reaction pool (6), a secondary sedimentation pool (7) and a defluorinating agent dosing pool (8) in sequence from top to bottom, wherein the primary reaction pool (4) is located at the water inlet of the reuse water pool, the primary reaction pool (4) is connected to the primary sedimentation pool (5), the primary sedimentation pool (5) is connected to the secondary reaction pool (6), and the secondary reaction pool (6) is connected to the secondary sedimentation pool (7), and the secondary sedimentation pool (7) is connected to the spiral humidifying distributor (10) through the defluorinating agent dosing pool (8).

2. A hydrogen fluoride production line wastewater recycling device and method 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 reuse water tank.

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

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

5. A hydrogen fluoride production line wastewater recycling device and method according to claim 1, characterized in that: The regulating tank (1) contains wastewater of three different water qualities: hydrofluoric acid, fluoride salt, and fluosilicic acid.

6. A method for a wastewater recycling device for a hydrogen fluoride production line, characterized in that: It includes the following specific operation methods: 1) The wastewater containing hydrofluoric acid, fluoride salt and fluosilicic acid of three different water qualities is transported to the regulating tank (1) for equalization and regulation treatment to make the water quantity and water quality relatively stable, thereby providing a stable and optimized operating condition for the subsequent water treatment process; 2) preliminary treatment through a primary reaction tank (4) and a primary sedimentation tank (5); 3) performing secondary treatment in a secondary reaction tank (6) and a secondary sedimentation tank (7); 4) Fluoride-containing wastewater is defluorinated by calcium method, so fluoride exists in the form of calcium fluoride. The by-product gypsum slag is mainly composed of calcium sulfate and calcium fluoride. Since the two have similar compositions, the treated wastewater is reused by spiral humidification distributor (10) to cool and humidify the high-temperature by-product gypsum slag, suppress dust, and neutralize and increase the pH value, thereby improving water utilization and achieving zero emission.

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