CN107376592B - Chromium plating mist recovery treatment method - Google Patents
Chromium plating mist recovery treatment method Download PDFInfo
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- CN107376592B CN107376592B CN201710561699.2A CN201710561699A CN107376592B CN 107376592 B CN107376592 B CN 107376592B CN 201710561699 A CN201710561699 A CN 201710561699A CN 107376592 B CN107376592 B CN 107376592B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/04—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour through foam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D2257/60—Heavy metals or heavy metal compounds
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Abstract
The invention discloses a chromium plating mist recovery processing method, which is characterized in that chromic acid mist generated in the electroplating production process is gradually sucked into serial recovery processing units through a notch fan cover by a pure physical method, is intercepted and adsorbed on the surfaces of a baffle plate and a filling material through the processes of diffusion, collision, nucleation, condensation, sedimentation and the like, and is recovered into a primary recovery water tank through intermittent and cyclic flushing, so that the aims of intercepting, capturing and recycling the chromic acid mist are fulfilled, and chromium plating waste gas meets the requirement of environmental protection emission without waste water emission in the whole process.
Description
Technical Field
The invention relates to a chromium plating mist recovery treatment method, and belongs to the technical field of chromium plating waste gas recovery treatment processes.
Background
Chromium plating is one of the most widely used plating species in the electroplating industry. The chromium plating layer can endow the metal material with excellent corrosion resistance and wear resistance and lower friction coefficient. The functional chromium plating can better ensure that the surface of the material obtains the excellent characteristics of brightness, hardness, discoloration resistance, wear resistance, corrosion resistance and the like, so the chromium electroplating is widely applied to the industries of surface protection of hardware, electromechanics, automobiles, aerospace key mechanical parts and the like as a surface treatment process technology.
In the electroplating production, when a large amount of hydrogen generated on the cathode escapes, chromic acid is carried out slightly, thereby forming chromic acid mist. The chromium fog is carried out, so that the loss of chromic acid is about 30 percent, and the environment is seriously polluted. At present, the treatment method of chromium fog comprises the steps of directly introducing an outlet of an exhaust pipeline into a water tank, and dissolving chromium fog from a chromium plating workshop into water, so that the method not only needs a fan with high power, but also discharges waste gas into the air during long-term production to influence the surrounding environment; in addition, the waste water in which the chromium fog is dissolved needs to be treated. In another method, chromium fog is recovered, and is collected in a chromium fog recovery period filled with plastic grid balls, and the chromium fog recoverer has the following problems: 1. the chromium fog recoverer only adopts the fixedly filled plastic grid balls to realize the recovery treatment of chromium fog, and the chromium fog scales on the plastic grid balls after a little long time, so small holes of the plastic grid balls are gradually blocked, the wind resistance is increased, and the treatment effect is poor; 2. the chromium fog recoverer has high maintenance difficulty and difficult operation and maintenance.
Disclosure of Invention
The invention provides a chromium plating mist recovery and purification treatment method, which adopts a multi-stage purification treatment unit to physically intercept chromium mist in a chromium plating tank, and realizes the whole process of chromium plating mist recovery and purification treatment without waste water discharge and manual maintenance.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a chromium plating fog recovery processing method comprises the steps that chromic acid fog in a chromium plating groove is led in from an air inlet of a first-level purification processing unit through a fog collecting cover, is discharged from the bottom after being processed, enters from the bottom of a second-level purification processing unit through a first-level recovery water tank, is discharged from the top of the second-level purification processing unit, enters from the top of a third-level purification processing unit through an air duct, processed waste gas passes through a third-level recovery water tank from the bottom of the third-level purification processing unit, enters from the bottom of an IV-level purification processing unit, is discharged from the top of the IV-level purification processing unit.
The technical scheme of the invention is further improved as follows: the top of each level of purification treatment unit is provided with a spraying device (11), and the bottom is provided with a recovery water tank.
The technical scheme of the invention is further improved as follows: the spray device (11) circularly or intermittently sprays and cleans the purification treatment unit, a condensation chamber I (1) in the I-level purification treatment unit is connected with the chromium plating groove, an I-level recovery water tank (2) of the I-level purification treatment unit is communicated with the chromium plating groove, and the spray device (11) in the final-level purification treatment unit is communicated with a pure water source for chromium plating.
The technical scheme of the invention is further improved as follows: the spray water of each stage of purification treatment unit comes from the next stage of recovery water tank.
The technical scheme of the invention is further improved as follows: the center of a condensation chamber I (1) in the I-stage purification treatment unit is a cavity, and an air deflector (8) is arranged outside the cavity to surround the cavity to form an annular air duct.
The technical scheme of the invention is further improved as follows: liquid level detection systems are arranged in all levels of purification treatment units, and the switches of the spraying devices (11) are controlled by controllers.
The technical scheme of the invention is further improved as follows: the condensing chambers of all levels of purification treatment units are provided with filler layers.
The technical scheme of the invention is further improved as follows: the filling material in the packing layer is one or more of a colored glaze ball, a solid plastic microsphere, a polypropylene hollow floating ball, a multi-surface hollow ball and a ceramic sheet.
The technical scheme of the invention is further improved as follows: the distance between adjacent air deflectors (8) in a condensation chamber I (1) of the I-level purification treatment unit is 2-12 mm, and the surfaces of the air deflectors (8) are subjected to corrosion-resistant and frosted treatment.
The technical scheme of the invention is further improved as follows: and a condensing device is arranged behind any odd-level purification treatment unit except the I-level purification treatment unit.
Due to the adoption of the technical scheme, the invention has the technical progress that:
the invention relates to a recovery and purification method which recovers and purifies chromic acid mist evaporated from a chromium plating tank in multiple stages and recovers the chromic acid mist into a current-stage recovery water tank by spraying in the purification treatment processes of the different stages. In the treatment method, a first-stage purification treatment unit is connected with a chromium plating tank, chromic acid mist is recycled and purified step by step and is finally sprayed into a previous-stage purification treatment unit from a last-stage evolution treatment unit in a chromium ion form, and is sprayed into a previous two-stage purification treatment unit from the previous-stage purification treatment unit, and so on, and finally the solution is recycled to the chromium plating tank. The whole process of the recovery and purification method has no wastewater discharge, and the aim of zero wastewater discharge is fulfilled; meanwhile, the whole recovery and purification treatment process does not need manual maintenance, so that the labor force is saved.
The recovery and purification treatment method adopts the chromium fog channel formed by a plurality of stages of purification treatment units which are connected in series and communicated with the chromium plating tank in sequence to intercept chromium fog, so that the chromium fog plays a role in recovering and purifying the chromium fog through the physical adsorption effect with the air channel in the whole process, new pollutants are prevented from being generated in a chemical treatment mode, and the pollution treatment process of new impurities is increased.
In the condensation chamber I of the I-level purification treatment, the air deflector is adopted to form a circuitous air duct, and the interval of the air duct is determined according to the flow rate and the air speed of the chromium fog in the chromium plating tank and the diameter of the condensation chamber, so that the chromium fog in the air duct is fully attached and adhered to the side wall of the air deflector, the contact area of the chromium fog attached to the inner wall of the air deflector is increased, and the attachment effect of the chromium fog is enhanced; meanwhile, the pressure of the chromium fog to each level of purification chamber is reduced, and the operation safety is ensured.
In addition, in the ceramic filler, the formed chromium fog drops have large volume and slow flow speed due to larger specific surface area, and the fog drops have sufficient contact time with the surface of the ceramic filler under the action of a long and tortuous air flow channel formed on the ceramic ring fragments which are staggered and naturally stacked by the canine teeth.
In the final stage recovery and purification process, the fan is installed at the tail end to suck air in the whole recovery and purification process, and compared with a chromium plating recovery method in the prior art, namely a mode of arranging the fan at the air inlet, the method avoids the corrosion of chromium fog at the air inlet to fan blades of the fan.
In the invention, the condensing chambers of all levels of purification treatment units are provided with a circulating or intermittent spray cleaning device which can perform circulating or intermittent spray cleaning on the corresponding units; meanwhile, the liquid level detection systems are arranged in the purification treatment units at all levels, so that the liquid level in the recovery water tank can be detected at any time, and the automatic water loss supplement of the later level to the former level is realized.
The chromium fog waste gas treated by the chromium plating fog recovery and purification method of the invention has the advantages that the recovered chromium ions are completely recycled to the chromium plating bath, thereby not only eliminating pollution and ensuring treatment effect, but also recovering resources; meanwhile, the chromium ion concentration measured at the discharge port of the recovery purification device was 0.027mg/m3Far below the national discharge standard for chromium ions of 0.05 mg/m3。
Drawings
FIG. 1 is a schematic cross-sectional view of an apparatus for the recovery purification process of the present invention;
FIG. 2 is a top view of the condensation chamber I;
wherein, 1, condensation chamber I, 2, I level recovery basin, 3, drainage recess, 4, condensation chamber II, 5, II level recovery basins, 6, condensation chamber III, 7, III level recovery basins, 8, aviation baffle, 9, fan, 10, interception board, 11, spray set.
Detailed Description
The invention is described in further detail below:
the invention provides a chromium plating mist recovery processing method, wherein chromic acid mist in a chromium plating groove is introduced from an air inlet of a grade I purification processing unit through a mist collecting cover, is discharged from the bottom after being processed, enters from the bottom of a grade II purification processing unit through a grade I recovery water tank, is discharged from the top, enters into the top of a grade III purification processing unit through an air duct, processed waste gas enters from the bottom of the grade III purification processing unit through a grade III recovery water tank, is discharged from the bottom and the top of a grade IV purification processing unit, and the like, so that the chromium plating mist can be processed, and finally can be safely discharged after reaching the standard.
As shown in fig. 1, each stage of the purification process includes: a condensation chamber I1 in a first-stage purification treatment unit is connected with a chromium plating groove, a first-stage recovery water tank 2 of the first-stage purification treatment unit is communicated with the chromium plating groove, a spraying device 11 in a final-stage purification treatment unit is communicated with a pure water source for chromium plating, so that chromium ions after the whole purification treatment are recycled into the chromium plating groove, and the upper part of each stage of purification treatment unit is provided with the spraying device 11 and a recovery water tank which is positioned at the lower part of the condensation chamber and is correspondingly communicated with the condensation chamber. The spraying device 11 in the final-stage purification treatment unit is communicated with a chromium plating pure water source, so that no wastewater is discharged in the whole process, and the aim of zero wastewater discharge is fulfilled; meanwhile, the purification treatment method does not need manual maintenance in the use process, and labor force is saved.
All be equipped with liquid level detection system in the purification processing unit of each grade to through the test of liquid level detection system or set for can make spray set 11 carry out circulation or intermittent type spray cleaning to this grade of purification processing unit, avoided the harm to human health that the operator caused when opening the device and rinse. Simultaneously, the shower water comes from next grade recovery tank, promptly: spray water of the spray device 11 in the I-level purification treatment process comes from the II-level recovery water tank 5, spray water in the second-level purification treatment process comes from the III-level recovery water tank 7, and spray water in the third-level recovery purification process comes from the pure water tank. Therefore, the concentration of chromium ions in the liquid in the next-stage recovery water tank is lower than that in the previous-stage recovery water tank, so that the concentration of chromium ions in each stage of recovery water tank is reduced progressively, and the concentration of chromium ions in the I-stage recovery water tank 2 is the highest. The I-level recovery water tank 2 is connected with the chromium plating tank, so that the recovered chromium ions can be recycled into the chromium plating tank, and the water consumption in the spraying process is also saved. The chromic acid fog is recycled and purified step by step, and finally sprayed into the previous purification treatment unit from the last-stage evolution treatment unit in the form of chromium ions, and then sprayed into the previous two-stage purification treatment unit from the previous-stage purification treatment unit, and so on, and finally the solution is recycled to the chromium plating tank. The whole process of the recovery and purification method has no wastewater discharge, and the aim of zero wastewater discharge is fulfilled; meanwhile, the whole recovery and purification treatment process does not need manual maintenance, so that the labor force is saved.
As shown in FIG. 2, the center of the condensation chamber I1 in the I-stage purification treatment unit is a cavity, and a circuitous air duct with a circular cross section is formed by surrounding an air deflector 8 outside the cavity. The flow rate of the chromium fog in the chromium plating bath, the wind speed and the diameter of the condensation chamber determine the interval of the air ducts, for example: phi 400, wind speed 5000m3The interval between the air deflectors 8 in a condensation chamber in the first-stage purification treatment unit of the purification treatment unit is 2-12 mm, so that chromium fog in an air duct is fully adhered to the inner walls of the air deflectors 8, the contact area of the chromium fog attached to the inner walls of the air deflectors 8 is increased, and the attachment effect of the chromium fog is enhanced; meanwhile, the pressure difference between the air inlet and the air outlet is ensured to be less than 80Pa, the pressure of air in the air duct is reduced, and the requirement on the air speed of the fan 9 is reduced. The surface of each air deflector 8 can be subjected to corresponding surface treatment of corrosion resistance, frosting, wrinkling, bulging and the like according to the property of the chromium plating liquid mist, so that the corrosion resistance of the air deflector 8 is improved.
In the treatment process of the recovered and purified water, the drainage groove 3 with the vertical height of 1/5-1/6 of the height of the I-level recovery water tank 2 is arranged above the I-level recovery water tank 2, so that when chromium fog is blown down from the middle cavity of the condensation chamber I1, the chromium fog can be adsorbed on the liquid surface in the I-level recovery water tank 2, the concentration of chromium ions in the I-level recovery water tank 2 is increased, and the utilization rate of the chromium ions recovered to the chromium plating tank is increased; meanwhile, after the spraying device 11 is started, the spraying water flowing down from the condensation chamber I1 can be collected at the drainage groove 3 to play a role in guiding flow.
The condensing chambers of each stage of purification treatment units are provided with packing layers, and the packing materials in the packing layers are one or more of colored glaze balls, solid plastic microspheres, polypropylene hollow floating balls, multi-surface hollow balls and ceramic plates. The chromium fog can form vortex in the filler, and simultaneously increases the collision chance of chromium fog drops and the surface of the filler, in addition, in the ceramic filler, the formed chromium fog drops have large volume and slow flow speed due to larger specific surface area, and the fog drops and the surface of the ceramic filler have sufficient contact time under the action of a long and tortuous airflow channel formed on ceramic ring fragments which are staggered and naturally accumulated by dog teeth. When the airflow of hydrogen and oxygen formed by electrolysis passes through the tortuous airflow channels, the carried chromium fog can be continuously adsorbed by the surface of the ceramic filler, a layer of liquid film is gradually formed on the surface of the ceramic filler, and the chromium fog flows downwards along the smooth surface of the ceramic under the action of self gravity, finally converges into large liquid drops at the lower end of the ceramic and flows back to the recovery water tank.
In the process of each stage of purification treatment, the interception plate 10 is arranged between the recovery water tanks, so that the cleaning and the collection of the liquid mist captured by each stage of treatment unit are realized, and the interception plate 10 and the bottom of the upper condensation chamber form an air duct communicated with the adjacent condensation chambers, so that the chromium mist airflow which is not attached in the previous stage of recovery purification step is led to the next stage of condensation chamber.
In the purification treatment process of each stage, a condensing device can be arranged behind any odd-numbered stage of purification treatment units except the I-stage purification treatment unit, which is more favorable for the condensation and capture of ultrafine mist drops and can fully reduce the emission concentration of chromic acid mist.
The foregoing is a detailed description of the invention, but the invention is not limited to the details presented above, i.e., it is not meant to be dependent upon the details described above to practice the invention. It should be apparent to those skilled in the art that any modifications to the teachings of the present invention will be within the scope and spirit of the present invention.
Claims (5)
1. A chromium plating mist recovery treatment method is characterized in that: the system is provided with a plurality of stages of purification treatment units, wherein each stage of purification treatment unit is sequentially provided with a spraying device, a condensation chamber and a recovery water tank from top to bottom, chromic acid mist in a chromium plating tank is introduced from an air inlet of the I-stage purification treatment unit through a mist collecting cover, is treated and then is discharged from the bottom, enters from the bottom of the II-stage purification treatment unit through the I-stage recovery water tank, is discharged from the top, enters from the bottom of the III-stage purification treatment unit through an air duct and enters from the top of the III-stage purification treatment unit, and treated waste gas passes through the III-stage recovery water tank from the bottom of the III-stage purification treatment unit and then enters;
the top of each level of purification treatment unit is provided with a spraying device (11), and the bottom is provided with a recovery water tank;
spray water of each stage of purification treatment unit comes from the next stage of recovery water tank;
the spraying device (11) circularly or intermittently sprays and cleans the purification treatment unit of the current stage, a condensation chamber I (1) in the purification treatment unit of the I stage is connected with the chromium plating groove, a recovery water tank I (2) of the purification treatment unit of the I stage is communicated with the chromium plating groove, and the spraying device (11) in the purification treatment unit of the last stage is communicated with a pure water source for chromium plating;
the center of a condensation chamber I (1) in the I-stage purification treatment unit is a cavity, and an air deflector (8) is arranged outside the cavity to surround the cavity to form an annular air duct; the diameter of the central cavity of a condensation chamber I (1) of the I-stage purification treatment unit is phi 400mm, and the wind speed of the chromium fog is 5000m3And h, the distance between the adjacent air deflectors (8) in the condensation chamber I (1) is 2-12 mm, and the surfaces of the air deflectors (8) are subjected to corrosion-resistant and frosted treatment.
2. The chromium plating mist recovery processing method according to claim 1, characterized in that: liquid level detection systems are arranged in all levels of purification treatment units, and the switches of the spraying devices (11) are controlled by controllers.
3. The chromium plating mist recovery processing method according to claim 1, characterized in that: the condensing chambers of all levels of purification treatment units are provided with filler layers.
4. The chromium plating mist recovery processing method according to claim 3, characterized in that: the filling material in the packing layer is one or more of a colored glaze ball, a solid plastic microsphere, a polypropylene hollow floating ball, a multi-surface hollow ball and a ceramic sheet.
5. The chromium plating mist recovery treatment method according to any one of claims 1 to 4, characterized in that: and a condensing device is arranged behind any odd-level purification treatment unit except the I-level purification treatment unit.
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| CN201710561699.2A CN107376592B (en) | 2017-07-11 | 2017-07-11 | Chromium plating mist recovery treatment method |
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| CN107376592B true CN107376592B (en) | 2021-01-08 |
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| CN110496523B (en) * | 2019-07-24 | 2020-12-11 | 杭州楚环科技股份有限公司 | Multistage purification type water supply balance type deodorization equipment |
| CN114606556A (en) * | 2022-03-30 | 2022-06-10 | 昆山品钰康机电设备有限公司 | Electroplating chromium energy cyclic utilization system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101543725A (en) * | 2009-04-30 | 2009-09-30 | 深圳市新环机械工程设备有限公司 | Biological filter deodorizing device |
| CN204973504U (en) * | 2015-07-14 | 2016-01-20 | 王蕾 | Nitrogen oxide waste gas treatment system |
| CN205182457U (en) * | 2015-12-11 | 2016-04-27 | 陆哲明 | Contain chromic acid gas multi -stage purification recovery unit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101543725A (en) * | 2009-04-30 | 2009-09-30 | 深圳市新环机械工程设备有限公司 | Biological filter deodorizing device |
| CN204973504U (en) * | 2015-07-14 | 2016-01-20 | 王蕾 | Nitrogen oxide waste gas treatment system |
| CN205182457U (en) * | 2015-12-11 | 2016-04-27 | 陆哲明 | Contain chromic acid gas multi -stage purification recovery unit |
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