Cyanide-containing waste gas purification treatment device

Abstract

The cyanide-containing waste gas purification treatment device comprises an air suction cover, a circulating pump, a circulating water tank and a purification tank, a spraying tank is arranged at the adjacent position of an exhaust pipe, a first circulation opening is formed between a first water baffle and a second water baffle, a second circulation opening is formed between the second water baffle and a third water baffle, and the third water baffle and the third water baffle are communicated. A third reaction area is formed by the first water baffle and the top of the purification box, a second reaction area is formed by the first water baffle and the third water baffle, and a first reaction area is formed by the third water baffle and the bottom of the purification box; cyanide-containing waste gas and absorption liquid are subjected to full contact reaction in the first reaction zone, the second reaction zone and the third reaction zone, and then flow into the circulating water tank, so that most harmful substances in collected gas are removed to reach the emission standard, and then are discharged through the exhaust pipe, and the stroke of the waste gas passing through the purification tank is increased in the process, so that the emission standard is met. And harmful substances in the waste gas can be fully treated.

Description

Technical Field

[0001] This utility model relates to, but is not limited to, the field of electroplating waste gas treatment equipment, and particularly to a cyanide-containing waste gas purification and treatment device. Background Technology

[0002] Electroplating is a metal surface treatment technology that deposits a metal coating on a metal surface through electrolysis to enhance corrosion resistance, improve conductivity, and improve appearance. Cyanide plating solutions play a complexing role in the electroplating process, helping metal ions remain dissolved and thus promoting metal deposition. During electroplating, the evaporation of the plating solution and the gases produced by the electrolytic reaction release cyanide-containing waste gas. Cyanide-containing waste gas is a toxic and harmful gas with extremely high toxicity, posing a serious threat to the environment and human health. Therefore, careful treatment of waste gas is necessary during the electroplating process.

[0003] When cyanide-containing waste gas enters the absorption tank or absorption box, it will flow directly out of the exhaust pipe under pressure. This flow process is the shortest path. During the shortest path process, the waste gas cannot fully and effectively contact the absorption liquid inside the box, resulting in a low effective absorption rate. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a cyanide-containing waste gas purification and treatment device, which solves the technical problem that after cyanide-containing waste gas enters the absorption tank or absorption box, it will flow directly to the exhaust pipe under pressure. This flow process is the shortest path, and in the shortest path process, the waste gas cannot fully and effectively contact the absorption liquid inside the box, resulting in a low effective absorption rate.

[0006] (II) Technical Solution

[0007] The purpose of this utility model is to provide a cyanide-containing waste gas purification and treatment device, which includes a suction hood, a circulating pump, a circulating water tank, and a purification tank. The circulating pump is located adjacent to the circulating water tank. A suction pipe connects the suction hood and the purification tank. The purification tank is located at the upper end of the circulating water tank. An exhaust pipe is located at the upper end of the purification tank. A spray box is located adjacent to the exhaust pipe. Spray holes are located at the bottom of the spray box. The spray box and the purification tank are connected through the spray holes. A first baffle plate, a second baffle plate, and a third baffle plate are arranged sequentially from top to bottom in the spray box. The first baffle plate and the top of the purification tank form a third reaction zone. The first baffle plate and the third baffle plate form a second reaction zone. The third baffle plate and the bottom of the purification tank form a first reaction zone. A first flow port is provided between the first baffle plate and the second baffle plate. A second flow port is provided between the second baffle plate and the third baffle plate.

[0008] Preferably, a connecting pipe is provided between the circulating water tank and the circulating pump, and a delivery pipe is provided between the circulating pump and the spray box.

[0009] Preferably, the first and third baffles are disposed on one side of the purification chamber, and the second baffle is disposed on the other side of the purification chamber.

[0010] Preferably, the first and third baffles are inclined from left to right and downward inside the purification chamber, and the second baffle is inclined from right to left and downward inside the purification chamber.

[0011] Preferably, the suction pipe is provided with an air inlet, which is located at the lower end of the third baffle plate.

[0012] Preferably, the exhaust pipe is provided with an air outlet, the air outlet is located at the upper end of the first baffle plate, and a demister is provided between the air outlet and the first baffle plate.

[0013] Preferably, the upper end of the purification box is provided with a limiting seat, and the spray box is disposed within the limiting seat.

[0014] Preferably, the purification tank and the circulating water tank are connected by a connecting hole.

[0015] Preferably, the upper end of the circulating water tank is also provided with a feeding port, and the outside of the circulating water tank is also connected to a drain valve.

[0016] (III) Beneficial Effects

[0017] The cyanide-containing waste gas generated on the electroplating tank is absorbed into the purification chamber through the suction hood. During this process, the absorbent liquid is transported to the spray box by the circulation pump and then flows into the purification chamber through the spray box. The absorbent liquid flowing into the purification chamber forms a water curtain at the first and second flow ports, allowing the cyanide-containing waste gas and absorbent liquid to undergo three full contact reactions in the first, second, and third reaction zones. Then, it flows into the circulating water tank, removing most of the harmful substances in the collected gas to meet the emission standards. Finally, it is discharged through the exhaust pipe. This process increases the travel distance of the cyanide-containing waste gas through the purification chamber, ensuring that the harmful substances in the waste gas are fully treated. Attached Figure Description

[0018] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0019] Figure 1 This is a three-dimensional view of the overall structure of the cyanide-containing waste gas purification and treatment device;

[0020] Figure 2 This is a half-sectional view of a cyanide-containing waste gas purification and treatment device;

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Suction hood; 2. Circulating pump; 3. Circulating water tank; 4. Purification box; 5. Suction pipe; 6. Exhaust pipe; 7. Spray box; 8. Spray hole; 9. First baffle plate; 91. First flow port; 92. Second flow port; 10. Second baffle plate; 11. Third baffle plate; 12. First reaction zone; 13. Second reaction zone; 14. Third reaction zone; 15. Conveying pipe; 16. Air inlet; 17. Air outlet; 18. Demister; 19. Limit seat; 20. Connecting hole; 21. Feeding port; 22. Drain valve. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0024] The following is in conjunction with the appendix Figures 1 to 2To further describe, this utility model discloses a cyanide-containing waste gas purification and treatment device, including a suction hood 1, a circulating pump 2, a circulating water tank 3, and a purification tank 4. The circulating pump 2 is located adjacent to the circulating water tank 3. The suction hood 1 is located above the electroplating tank and is connected to the purification tank 4 by a suction pipe 5. The gas flow is controlled by a fan. The purification tank 4 is located above the circulating water tank 3, and an exhaust pipe 6 is located at the top of the purification tank 4. A spray box 7 is located adjacent to the exhaust pipe 6. The spray box 7 is equipped with a sealing cover. The liquid is transported to the spray box 7 by the circulating pump 2. Due to the spray holes 8 located at the bottom of the spray box 7, the absorbent liquid is sprayed into the purification tank 4 through the spray holes 8 that communicate with the purification tank 4. There are two or more spray holes 8 arranged in an array inside the spray box 7. From top to bottom, a first baffle plate 9, a second baffle plate 10, and a third baffle plate 11 are arranged in sequence inside the spray box 7. 1. A third reaction zone 14 is formed between the first baffle plate 9 and the top of the purification tank 4. A second reaction zone 13 is formed between the first baffle plate 9 and the third baffle plate 11. A first reaction zone 12 is formed between the third baffle plate 11 and the bottom of the purification tank 4. A first flow port 91 is provided between the first baffle plate 9 and the second baffle plate 10. A second flow port 92 is provided between the second baffle plate 10 and the third baffle plate 11. The absorbent liquid forms a water curtain between the third baffle plate 11 and the bottom of the purification tank 4, as well as between the first flow port 91 and the second flow port 92. This allows the cyanide-containing waste gas passing through the purification tank 4 to undergo three full contact reactions with the absorbent liquid in the first reaction zone 12, the second reaction zone 13, and the third reaction zone 14. In addition, the flowing absorbent liquid will splash with the baffle plates. The large amount of splashed water will further enhance the contact between the cyanide-containing waste gas and the absorbent liquid, thereby improving the purification effect to a certain extent.

[0025] In a preferred embodiment, a connecting pipe is provided between the circulating water tank 3 and the circulating pump 2, and a delivery pipe 15 is provided between the circulating pump 2 and the spray tank 7. The absorption liquid used for the reaction is circulated and transported by the circulating pump 2. The absorption liquid is one of NaOH or NaClO solution. During the circulation process, the absorption liquid needs to be tested regularly. The absorption liquid after the reaction is completed is then sent to the wastewater treatment plant for further treatment through the cyanide-containing wastewater pipeline.

[0026] In a preferred embodiment, the first baffle plate 9 and the third baffle plate 11 are disposed on one side of the purification box 4, and the second baffle plate 10 is disposed on the other side of the purification box 4. The three are arranged in an alternating manner, so that the flow path of the cyanide-containing waste gas is set in a curved shape, thereby extending the flow route.

[0027] In a preferred embodiment, the first baffle plate 9 and the third baffle plate 11 are inclined from left to right and downward inside the purification tank 4, extending between the first baffle plate 9 and the top of the purification tank 4, and the second baffle plate 10 is inclined from right to left and downward inside the purification tank 4, extending between the first baffle plate 9 and the third baffle plate 11.

[0028] In a preferred embodiment, the suction pipe 5 is provided with an air inlet 16, which is located at the lower end of the third baffle plate 11.

[0029] In a preferred embodiment, the exhaust pipe is provided with an air outlet 17, which is located at the upper end of the first baffle plate 9, and a demister 18 is provided between the air outlet 17 and the first baffle plate 9.

[0030] In a preferred embodiment, a limiting seat 19 is provided at the upper end of the purification box 4, and the spray box 7 is disposed within the limiting seat 19 to limit and fix the spray box 7.

[0031] In a preferred embodiment, a connecting hole 20 is provided between the purification tank 4 and the circulating water tank 3, through which the absorbent liquid flowing down from the spray tank 7 is recycled back into the circulating water tank 3.

[0032] In a preferred embodiment, a feeding port 21 is provided at the upper end of the circulating water tank 3, and a drain valve 22 is connected to the cyanide-containing wastewater pipe outside the circulating water tank 3.

[0033] In summary, the cyanide-containing waste gas generated on the electroplating tank is absorbed into the purification chamber by the suction hood. During this process, the absorbent liquid is transported to the spray box by a circulation pump and then flows into the purification chamber. The absorbent liquid flowing into the purification chamber forms a water curtain at the first and second flow ports, allowing the cyanide-containing waste gas and absorbent liquid to undergo three full contact reactions in the first, second, and third reaction zones. Then, it flows into the circulating water tank, removing most of the harmful substances in the collected gas. Finally, it is discharged through the exhaust pipe, either entering the next treatment process or being directly discharged. This process increases the inflow and outflow of the cyanide-containing waste gas through the purification chamber, ensuring that the harmful substances in the waste gas are fully treated.

[0034] Although the technical solutions according to the present invention have been described with reference to several different embodiments, aspects and features, it is not intended to limit the scope of the present invention, but modifications thereof are included within the broad scope of the foregoing disclosure, drawings and claims.

Claims

1. A cyanide-containing waste gas purification and treatment device, comprising a suction hood, a circulating pump, a circulating water tank, and a purification tank, wherein the circulating pump is disposed adjacent to the circulating water tank, a suction pipe is connected between the suction hood and the purification tank, the purification tank is disposed above the circulating water tank, an exhaust pipe is disposed at the upper end of the purification tank, a spray box is disposed adjacent to the exhaust pipe, spray holes are disposed at the bottom of the spray box, and the spray box and the purification tank are connected through the spray holes, characterized in that: The spray box is provided with a first baffle plate, a second baffle plate and a third baffle plate in sequence from top to bottom. The first baffle plate and the top of the purification box form a third reaction zone, the first baffle plate and the third baffle plate form a second reaction zone, and the third baffle plate and the bottom of the purification box form a first reaction zone. A first flow port is provided between the first baffle plate and the second baffle plate, and a second flow port is provided between the second baffle plate and the third baffle plate.

2. The cyanide-containing waste gas purification and treatment device according to claim 1, characterized in that: A connecting pipe is provided between the circulating water tank and the circulating pump, and a delivery pipe is provided between the circulating pump and the spray box.

3. The cyanide-containing waste gas purification and treatment device according to claim 1, characterized in that: The first and third baffles are located on one side of the purification chamber, and the second baffle is located on the other side of the purification chamber.

4. The cyanide-containing waste gas purification and treatment device according to claim 1, characterized in that: The first and third baffles are inclined from left to right and downward inside the purification chamber, while the second baffle is inclined from right to left and downward inside the purification chamber.

5. The cyanide-containing waste gas purification and treatment device according to claim 1, characterized in that: The suction pipe is equipped with an air inlet, which is located at the lower end of the third baffle plate.

6. The cyanide-containing waste gas purification and treatment device according to claim 1, characterized in that: The exhaust pipe is equipped with an air outlet, which is located at the upper end of the first baffle plate, and a demister is installed between the air outlet and the first baffle plate.

7. The cyanide-containing waste gas purification and treatment device according to claim 1, characterized in that: The upper end of the purification box is provided with a limiting seat, and the spray box is disposed within the limiting seat.

8. The cyanide-containing waste gas purification and treatment device according to claim 1, characterized in that: The purification tank and the circulating water tank are connected by a connecting hole.

9. The cyanide-containing waste gas purification and treatment device according to claim 1, characterized in that: The upper end of the circulating water tank is also provided with a feeding port, and the outside of the circulating water tank is also connected to a drain valve.

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