Chromic acid mist tail gas treatment system

Abstract

The utility model discloses a chromic acid mist tail gas treatment system. The chromic acid mist tail gas treatment system comprises a negative pressure reaction tank, a water vacuum metering buffer tank, a buffer water tank, a vacuum machine and a spray tower which are sequentially connected from left to right through four gas vacuum pipes, wherein the water vacuum metering buffer tank, the buffer water tank and the spray tower are connected with the negative pressure reaction tank through a wastewater recovery pipe; in the prior art, chromic acid mist treatment has the problems of low chromium recovery efficiency and incomplete treatment. Aiming at the challenges, a chromic acid mist treatment system comprising a negative pressure reaction tank, a buffer water tank, a vacuum machine and a spray tower is designed, a magnesium salt solution in the negative pressure reaction tank reacts with chromic acid mist to extract chromium, the buffer water tank further dissolves unreacted tail gas, and the vacuum machine assists tail gas transmission; and the spray tower neutralizes the tail gas through an alkaline solution, so that the chromium recovery rate is remarkably improved, the acidity and corrosivity of the tail gas are reduced, and efficient treatment and recovery of chromic acid mist are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of chromic acid mist treatment, especially to a chromic acid mist tail gas treatment system. BACKGROUND

[0002] In the electroplating industry, the treatment of chromic acid mist has always been an important environmental protection problem. Traditional chromic acid mist treatment methods, such as the chromic acid mist recycling and circulating device disclosed in the Chinese utility model patent with application number 202220173662.9, mainly extract the chromium mist generated during electroplating through a sealing cover, and then introduce it into a chromium mist recycler and a tail gas treatment tower for spray treatment to recover the chromium in the chromium mist. However, this method has certain limitations in actual application, especially in terms of the low recovery efficiency of chromium and the incomplete treatment effect.

[0003] Specifically, although the traditional spray method can reduce the concentration of chromic acid mist to a certain extent, the contact time and contact area of the spray liquid with the chromic acid mist are limited, resulting in low recovery efficiency of chromium, and part of the chromium elements still remain in the tail gas in the form of gas or small particles, which are difficult to be effectively captured and recovered. In addition, the use and recovery of the spray liquid also have certain technical problems, such as large consumption of spray liquid and low recovery utilization rate, which further limits the application effect of the traditional treatment method.

[0004] Therefore, in order to overcome the defects of the prior art and improve the treatment efficiency of chromic acid mist and the recovery effect of chromium, a more advanced and efficient chromic acid mist treatment system needs to be developed. The utility model emerges as the times require in this background, aiming to provide a new treatment system that can more completely treat the chromic acid mist generated in the electroplating process, improve the recovery efficiency of chromium, and reduce the acidity and corrosiveness of the tail gas. SUMMARY

[0005] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a chromic acid mist tail gas treatment system to solve the above problems.

[0006] To achieve the above purpose, the utility model discloses a chromic acid mist tail gas treatment system, which comprises a negative pressure reaction tank, a water vacuum metering buffer tank, a buffer water tank, a vacuum machine and a spray tower connected in sequence from left to right through four gas vacuum pipes.

[0007] Among them, the water vacuum metering buffer tank, the buffer water tank and the spray tower are connected with the negative pressure reaction tank through a wastewater recovery pipe;

[0008] The negative pressure reaction tank is provided with a stirring device.

[0009] Preferably, the negative pressure reaction tank is connected with an extraction vacuum pipe for extracting chromic acid mist.

[0010] Preferably, the stirring device comprises a motor fixed on the upper end of the negative pressure reaction tank and a stirring blade assembly arranged inside the negative pressure reaction tank, and the stirring blade assembly is fixedly connected with the output shaft of the motor.

[0011] Preferably, the spray tower is connected with a chimney, and the chimney is provided with a fan.

[0012] Preferably, the stirring blade assembly comprises a rotating shaft fixed with the output shaft of the motor, the side surface of the rotating shaft is provided with a sliding rail, one end of the sliding rail is fixed with the side surface of the rotating shaft, and the other end of the sliding rail is higher than the connecting end of the rotating shaft, a sliding block is slidably arranged in the sliding rail, and the sliding block is fixed with a stirring rod.

[0013] Compared with the prior art, the present application has the following advantages: in the prior art, the chromium acid mist treatment has the problems of low chromium recovery efficiency and incomplete treatment. In view of these challenges, the present application designs a chromium acid mist treatment system comprising a negative pressure reaction tank, a buffer water tank, a vacuum machine and a spray tower, uses the magnesium salt solution in the negative pressure reaction tank to react with the chromium acid mist to extract chromium, further dissolves the unreacted tail gas in the buffer water tank, uses the vacuum machine to assist the transmission of the tail gas, and uses the spray tower to neutralize the tail gas by means of an alkaline solution, thereby significantly improving the chromium recovery rate and reducing the acidity and corrosiveness of the tail gas, and realizing efficient treatment and recovery of the chromium acid mist. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and are used to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0015] Fig. 1 It is a structural schematic view of the present application.

[0016] Fig. 2 It is a structural schematic view of the stirring blade assembly of the present application.

[0017] In the drawings: 1, negative pressure reaction tank; 2, water vacuum meter buffer tank; 3, buffer water tank; 4, vacuum machine; 5, spray tower; 6, gas vacuum pipe; 7, stirring device; 71, motor; 72, stirring blade assembly; 721, rotating shaft; 722, sliding rail; 723, sliding block; 724, stirring rod; 8, wastewater recovery pipe; 9, extraction vacuum pipe; 10, chimney; 11, fan. DETAILED DESCRIPTION

[0018] The specific embodiments of the present application will be further described below in conjunction with the accompanying drawings. Figs. 1-2 The specific embodiments of the present application will be further described below in conjunction with the accompanying drawings.

[0019] As Figs. 1-2As shown, the utility model discloses a kind of chrome acid mist tail gas processing systems, including from left to right through four gas vacuum pipes 6 sequentially connected negative pressure reaction tank 1, water vacuum metering buffer tank 2, buffer water tank 3, vacuum machine 4 and spray tower 5, magnesium salt solution can be stored in negative pressure reaction tank 1: such as magnesium sulfate or magnesium chloride solution, when chrome acid mist tail gas enters negative pressure reaction tank 1, it can react with magnesium salt solution to generate chromium solid, so that the chrome in tail gas can be extracted, then, under the action of vacuum machine 4, chrome acid mist tail gas that is not reacted completely enters water vacuum metering buffer tank 2 and buffer water tank 3, after chrome acid mist tail gas contacts water, part is dissolved in water, then enters spray tower 5 by the action of vacuum machine 4, spray tower 5 can spray out alkaline solution, for example, sodium hydroxide, these alkaline solutions can neutralize with chromic acid, so as to reduce the acidity and corrosiveness of tail gas.

[0020] Among them, water vacuum metering buffer tank 2, buffer water tank 3 and spray tower 5 are connected with negative pressure reaction tank 1 by a wastewater recovery pipe 8, during processing, water vacuum metering buffer tank 2, buffer water tank 3 and spray tower 5 will have chrome residue, which is recycled to negative pressure reaction tank 1 by wastewater recovery pipe 8 for recycling treatment, so as to improve the recovery effect of chrome.

[0021] Negative pressure reaction tank 1 is equipped with stirring device 7, and the stirring device 7 is used for stirring magnesium salt solution to make chrome acid mist tail gas contact with magnesium salt solution more fully.

[0022] In some embodiments, negative pressure reaction tank 1 is connected with extraction vacuum pipe 9 for extracting chrome acid mist tail gas, and the extraction vacuum pipe 9 can be connected with electroplating tank for extracting tail gas generated during electroplating.

[0023] In some embodiments, the stirring device 7 includes a motor 71 fixed to the upper end of the negative pressure reaction tank 1 and a stirring blade assembly 72 arranged inside the negative pressure reaction tank 1, and the stirring blade assembly 72 is fixedly connected with the output shaft of the motor 71.

[0024] The spray tower 4 is connected with a chimney 10, and the chimney 10 is installed with a fan 11.

[0025] As Fig. 2As shown, in some embodiments, the stirring blade assembly 72 comprises a rotating shaft 721 fixed with the output shaft of the motor 71, the side of the rotating shaft 721 is provided with a slide rail 722, one end of the slide rail 722 is fixed with the side of the rotating shaft 721, and the other end of the slide rail 722 is higher than the connecting end of the rotating shaft 721, a sliding block 723 is slidably arranged in the slide rail 722, and the stirring rod 724 is fixed with the sliding block 723. It can be understood that, due to the higher end of the slide rail 722 connected with the rotating shaft 721, the sliding block 723 will automatically move to the lower end under the action of gravity, when the output shaft of the motor 71 drives the rotating shaft 721 to rotate, the rotating shaft 721 will drive the slide rail 722 to rotate, and the slide rail 722 will drive the stirring rod 724 to do centrifugal motion, under the action of centrifugal force, the stirring rod 724 will move to the higher end of the slide rail 722, within a certain range, the faster the rotating speed of the output shaft of the motor 71, the greater the centrifugal force, and the farther the stirring rod 724 from the rotating shaft 721, on the contrary, the lower the rotating speed of the motor 71, the smaller the centrifugal force, and the closer the stirring rod 724 to the rotating shaft 721, in this way, during the stirring process, the stirring range of the stirring rod 724 can be changed by changing the rotating speed of the output shaft of the motor 71, so that the chrome acid mist tail gas can be fully reacted after contacting with the magnesium salt solution after entering the negative pressure reaction tank 1.

[0026] In summary, the utility model aims at providing a kind of chrome acid mist tail gas treatment system, through the combination of negative pressure reaction tank 1, buffer water tank 2, vacuum machine 3 and spray tower 4, and the setting of stirring device 7 and waste water recovery pipe 8, more thorough treatment and recovery to the chrome acid mist tail gas generated in the process of electroplating are realized, the recovery effect of chromium is improved, and the acidity and corrosiveness of tail gas are reduced.

[0027] Finally, it should be noted that: the above only for the preferred embodiments of the utility model and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A chromium acid mist tail gas treatment system characterized by, It comprises a negative pressure reaction tank (1), a water vacuum metering buffer tank (2), a buffer water tank (3), a vacuum machine (4) and a spray tower (5) connected in sequence from left to right through four gas vacuum pipes (6); The water vacuum metering buffer tank (2), the buffer water tank (3) and the spray tower (5) are connected with the negative pressure reaction tank (1) through a waste water recovery pipe (8); The negative pressure reaction tank (1) is provided with a stirring device (7).

2. A chromium acid mist tail gas treatment system according to claim 1, wherein, The negative pressure reaction tank (1) is connected with a vacuum pipe (9) for extracting chromium acid mist.

3. A chromium acid mist tail gas treatment system according to claim 1, wherein, The stirring device (7) comprises a motor (71) fixed on the upper end of the negative pressure reaction tank (1) and a stirring blade assembly (72) arranged in the negative pressure reaction tank (1), and the stirring blade assembly (72) is fixedly connected with the output shaft of the motor (71).

4. A chromium acid mist tail gas treatment system according to claim 1, wherein The spray tower (5) is connected with a chimney (10) provided with a fan (11).

5. A chromium acid mist tail gas treatment system according to claim 3, wherein The stirring blade assembly (72) comprises a rotating shaft (721) fixed with the output shaft of the motor (71), the side surface of the rotating shaft (721) is provided with a slide rail (722), one end of the slide rail (722) is fixed with the side surface of the rotating shaft (721), and the other end of the slide rail (722) is higher than the connecting end of the rotating shaft (721), a sliding block (723) is slidably arranged in the slide rail (722), and the sliding block (723) is fixed with a stirring rod (724).

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