CN219469859U - Hot galvanizing finishing machine wastewater pretreatment system - Google Patents
Hot galvanizing finishing machine wastewater pretreatment system Download PDFInfo
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- CN219469859U CN219469859U CN202320303029.1U CN202320303029U CN219469859U CN 219469859 U CN219469859 U CN 219469859U CN 202320303029 U CN202320303029 U CN 202320303029U CN 219469859 U CN219469859 U CN 219469859U
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- 239000002351 wastewater Substances 0.000 title claims abstract description 46
- 238000005246 galvanizing Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 238000007885 magnetic separation Methods 0.000 claims abstract description 29
- 238000012216 screening Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 239000002893 slag Substances 0.000 claims abstract description 6
- 239000010802 sludge Substances 0.000 claims description 26
- 238000007790 scraping Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 9
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 8
- 239000003921 oil Substances 0.000 description 7
- 239000010865 sewage Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 239000010705 motor oil Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Coating With Molten Metal (AREA)
Abstract
The utility model discloses a hot galvanizing finishing machine wastewater pretreatment system. Comprises a screening device, a cyclone separation device and a magnetic separation device; the screening device comprises a screen (2), a collecting tank (5) and a water collecting tank (6); the cyclone separation device comprises a first cyclone (11) and a second cyclone (15); the collecting tank (5) is connected to the upper part of the screen (2) through the water inlet pipe (1); the bottom of the water collecting tank (6) is connected with a first cyclone water inlet (9) through a lifting pump (7) and a pipeline; the first cyclone overflow port (10) is connected with the second cyclone water inlet (13) through the mixer (12); the first cyclone underflow opening (23) is connected with the magnetic separation device, the second cyclone underflow opening (17) is connected with the water producing tank (26), and the second cyclone overflow opening (14) is connected with the slag collecting tank (24). The utility model has small occupied area, stable treatment effect, can effectively improve the water quality of the wastewater and reduce the influence of pollutants on the environment and the subsequent treatment process.
Description
Technical Field
The utility model belongs to the technical field of industrial wastewater treatment, and particularly relates to a wastewater pretreatment system of a hot galvanizing finishing machine.
Background
The cold rolling hot galvanizing finishing machine generally adopts wet finishing, the wet finishing system of the finishing machine of the galvanizing unit sprays desalted water at the inlet side of the working roller, after the finishing liquid system is put into use, the finishing liquid mixed in proportion is sprayed, and then the high-pressure desalted water is adopted to flush the roller gap and the roller surface behind the finishing machine.
The waste water produced by the finishing machine is large in quantity and low in cyclic utilization rate, and the waste water in the production process is generally sent to a sewage treatment station for treatment.
The existing wet finishing process uses a direct injection process to prepare desalted water and stock solution into finishing liquid, and after one use, all the finishing liquid is thoroughly discharged.
The main pollutants in the wastewater of the finishing machine are generally finishing liquid, zinc powder, iron powder and a small amount of engine oil, and the wastewater of the finishing machine is generally collected into a sewage tank and then is sent to a sewage station for treatment by a lifting pump.
Because the wastewater of the finishing machine contains a certain amount of zinc powder, iron powder and a small amount of engine oil, an oil sludge mixture is easy to form and deposit to the bottom of the tank, so that a great amount of sludge is generated in the sewage tank, the effective volume of the tank body is reduced or a lifting pump is blocked, and the operation of a subsequent treatment process is also not facilitated.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a hot galvanizing finishing machine wastewater pretreatment system, which realizes the efficient removal of suspended matters and oil substances in the finishing machine wastewater, improves the wastewater quality and is beneficial to the operation of subsequent treatment processes.
The technical scheme of the utility model is as follows: a hot galvanizing finishing machine wastewater pretreatment system comprises a screening device, a cyclone separation device and a magnetic separation device; the screening device comprises a screen, a collecting tank and a water collecting tank; the cyclone separation device comprises a first cyclone and a second cyclone; the collecting tank is arranged beside the water collecting tank, the screen is arranged above the water collecting tank, and the collecting tank is connected to the upper part of the screen through the water inlet pipe;
the first cyclone is provided with a first cyclone water inlet, a first cyclone overflow port and a first cyclone underflow port;
the second cyclone is provided with a second cyclone water inlet, a second cyclone bottom flow port and a second cyclone overflow port;
the bottom of the water collecting tank is connected with the water inlet of the first cyclone through a lifting pump and a pipeline;
the overflow port of the first cyclone is connected with the water inlet of the second cyclone through a mixer;
the first cyclone underflow opening is connected with the magnetic separation device, the second cyclone underflow opening is connected with the water producing tank, and the second cyclone overflow opening is connected with the slag collecting tank.
According to the embodiment of the utility model, the magnetic separation device comprises a magnetic drum, a rotary brush and a mud discharging plate; an automatic mud scraping device is arranged on the mud discharging plate, a mud collecting tank is arranged below the mud discharging plate, and a magnetic separation water outlet is arranged at the lower part of the magnetic separation device; and a water inlet baffle is arranged in the magnetic separation device.
According to the embodiment of the utility model, an overflow pipe is arranged in the collecting tank and is connected with the water collecting tank; and a drain valve is arranged at the bottom of the collecting tank.
According to the embodiment of the utility model, the bottom of the water collecting tank adopts a cone, and the included angle between the tank wall and the horizontal direction is 30-60 degrees; the upper part of the water collecting tank is provided with a water collecting tank overflow pipe.
According to the embodiment of the utility model, the screen is a fixed screen, the mesh is 3-5 mm, the screen is obliquely arranged, and the included angle between the screen and the horizontal direction is 30 degrees.
According to the embodiment of the utility model, the bottom of the water producing tank is provided with a drainage pump and a dissolved air pump; the dissolved air pump is connected with the water producing tank through an air inlet of the dissolved air pump; and the outlet of the dissolved air pump is connected with the mixer.
According to the embodiment of the utility model, the diversion ratio of the bottom flow port of the first cyclone is smaller than 0.2, and the diversion ratio of the overflow port of the second cyclone is smaller than 0.1.
The air inlet of the dissolved air pump adopts a pressure air inlet mode, and the air inlet is provided with a flow regulating device for controlling the gas-liquid ratio, wherein the gas-liquid ratio is 1:9-1:20.
The mixer adopts a jet mixing mode.
The magnetic separation device is designed to be a magnetic drum according to the quality of the effluent water, and two stages of magnetic separation can be arranged.
The system effectively removes zinc powder and iron powder with high specific gravity in the wastewater by utilizing the two-stage hydrocyclone and the magnetic separation device, removes a small amount of engine oil substances in the wastewater, improves the water quality of the wastewater, and is beneficial to the operation of subsequent treatment processes.
The beneficial technical effects of the utility model are as follows: the method has the advantages that the screen mesh filtration, the two-stage hydrocyclone and the magnetic separation device are adopted to carry out short-flow treatment on the wastewater of the finishing machine, so that suspended matters and oil substances in the wastewater of the finishing machine are effectively removed, the water quality of the wastewater is improved, the problem that suspended matters in the wastewater of the finishing machine are deposited in a sewage pool is solved, and the pretreated effluent can enter a sewage station or can be recycled; the system has the advantages of small occupied area of the adopted equipment, stable treatment effect, lower operation cost and high water yield, can effectively improve the water quality of the wastewater, reduces the influence of pollutants on the environment and the subsequent treatment process, and has obvious economic benefit.
Drawings
FIG. 1 is a block diagram of a hot dip galvanizing finishing machine wastewater pretreatment system.
In the figure: 1-a water inlet pipe; 2-screening; 3-collecting tank overflow pipe; 4-a blow-down valve; 5-a collection tank; 6-a water collecting tank; 7-a lift pump; 8-overflow pipe of water collecting tank; 9-a first cyclone water inlet; 10-an overflow port of the first cyclone; 11-a first cyclone; 12-a mixer; 13-a second cyclone water inlet; 14-a second cyclone overflow port; 15-a second cyclone; 16-a sludge collection tank; 17-a second cyclone underflow port; 18-a water inlet baffle; 19-magnetic separation water outlet; 20-rotating brush; 21-a magnetic drum; 22-mud-removing plate; 23-a first cyclone underflow port; 24-a slag collecting groove; 25-draining pump; 26-a water producing pool; 27-a dissolved air pump air inlet; 28-a dissolved air pump; 29-automatic mud scraping device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
A hot galvanizing finishing machine wastewater pretreatment system comprises a screening device, a cyclone separation device and a magnetic separation device; the screening device comprises a screen 2, a collecting tank 5 and a water collecting tank 6; the cyclone separation device comprises a first cyclone 11 and a second cyclone 15; the collecting tank 5 is arranged beside the water collecting tank 6, the screen 2 is arranged above the water collecting tank 6, and the collecting tank 5 is connected above the screen 2 through the water inlet pipe 1;
the first cyclone 11 is provided with a first cyclone water inlet 9, a first cyclone overflow port 10 and a first cyclone underflow port 23;
the second cyclone 15 is provided with a second cyclone water inlet 13, a second cyclone underflow port 17 and a second cyclone overflow port 14;
the bottom of the water collecting tank 6 is connected with a first cyclone water inlet 9 through a lifting pump 7 and a pipeline;
the first cyclone overflow port 10 is connected with the second cyclone water inlet 13 through the mixer 12;
the first cyclone underflow opening 23 is connected with the magnetic separation device, the second cyclone underflow opening 17 is connected with the water producing tank 26, and the second cyclone overflow opening 14 is connected with the slag collecting tank 24.
The magnetic separation device comprises a magnetic drum 21, a rotary brush 20 and a mud discharging plate 22; an automatic sludge scraping device 29 is arranged on the sludge discharge plate 22, a sludge collecting tank 16 is arranged below the sludge discharge plate 22, and a magnetic separation water outlet 19 is arranged at the lower part of the magnetic separation device; a water inlet baffle 18 is arranged in the magnetic separation device.
An overflow pipe 3 is arranged in the collecting tank 5, and the overflow pipe 3 is connected with a water collecting tank 6; and a drain valve 4 is arranged at the bottom of the collecting tank 5.
The bottom of the water collecting tank 6 adopts a cone, and the included angle between the tank wall and the horizontal direction is 30-60 degrees; the upper part of the water collecting tank 6 is provided with a water collecting tank overflow pipe 8.
The screen 2 is a fixed screen, meshes are 3-5 mm, the screen 2 is obliquely installed, and an included angle between the screen 2 and the horizontal direction is 30 degrees.
The bottom of the water producing tank 26 is provided with a drainage pump 25 and a dissolved air pump 27; the dissolved air pump 27 is connected with the water producing tank 26 through a dissolved air pump air inlet 28; the outlet of the dissolved air pump 27 is connected with the mixer 12.
The underflow port split ratio of the first cyclone 11 is less than 0.2, and the overflow port split ratio of the second cyclone 15 is less than 0.1.
The air inlet 27 of the dissolved air pump adopts a pressure air inlet mode, and the air inlet 27 of the dissolved air pump is provided with a flow regulating device for controlling the air-liquid ratio, wherein the air-liquid ratio is 1:9-1:20.
The sludge discharge plate 22 of the magnetic separation device is provided with an automatic sludge scraping device 31 for conveying the sludge on the sludge discharge plate 22 to the sludge collecting tank 16.
A hot galvanizing finishing machine wastewater pretreatment method comprises the following steps:
specifically, during rolling, the strip steel and the roller are washed by low-pressure washing water (containing finishing liquid) firstly, then washed by high-pressure washing water (desalted water), washing wastewater generally contains zinc powder, iron powder and dirt on the surface of the roller washed from the surfaces of the strip steel and the roller, engine oil and finishing liquid residual components on mechanical equipment are also included, the washing wastewater flows into a wastewater collection tank at the bottom of the finishing machine, the wastewater is introduced above the screen 2 through a pipeline, and after larger impurities in the wastewater are filtered through the screen 2, the wastewater flows into the water collection tank 6.
Further, screen cloth 2 behind long-term operation, impurity can block up the screen cloth, need clear up screen cloth 2, and waste water gets into collecting vat 5 behind the screen cloth 2 jam, gets into catch basin 6 from collecting vat overflow pipe 3, and the collecting vat 5 bottom sets up blow off valve 4, when elevator pump 7 need shut down the maintenance, and waste water flows through catch basin overflow pipe 8.
Specifically, the wastewater in the water collecting tank 6 mainly contains zinc powder, iron powder, oil stains and finishing liquid, and the water collecting tank 6 is arranged into a cone, so that suspended matters in the wastewater are prevented from being deposited at the bottom of the tank. The wastewater in the water collecting tank 6 enters the first cyclone 11 after being lifted by the lifting pump 7, zinc powder and iron powder with larger specific gravity flow out of the first cyclone underflow opening 23 into the magnetic separation device, and separated water phase flows out of the first cyclone overflow opening 10 into the mixer 12.
Specifically, in the mixer 12, the water discharged from the overflow port 10 of the first cyclone and the water discharged from the dissolved air pump 28 are mixed to generate foam, and the foam enters the second cyclone 15 to separate oil and suspended matters with light specific gravity from water, and the foam generated by air is adsorbed by the suspended matters and the oil, and flows out from the overflow port 14 of the second cyclone to become scum, and the scum is collected in the slag collecting groove 24 and discharged; the separated water phase enters a water producing tank 26 for storage, and is sent to a subsequent treatment process through a drainage pump 25.
Further, the effluent of the first cyclone underflow opening 23 separates zinc powder and iron powder in the magnetic separation device, the separated sludge enters the sludge collecting tank 16, and the sludge in the sludge collecting tank 16 is transported and disposed.
Further, as shown in fig. 1, the zinc powder and the iron powder separated by the magnetic separation device are separated from the magnetic drum 21 by a scraper, and then are sent to a sludge discharge plate 22 by a rotating brush 20, and an automatic sludge scraping device 29 is arranged on the sludge discharge plate 22 to send the sludge into the sludge collecting tank 16.
Further, the waste water in the water producing pool 26 is used as water inlet by the dissolved air pump 28, the air inlet 27 of the dissolved air pump is provided with an air inlet adjusting device, the air-liquid ratio is controlled to be 1:9-1:20, and the reflux ratio of the dissolved air pump 28 is controlled to be 20-30%.
The water quality before and after the treatment was analyzed by using the finishing machine flushing wastewater of a cold rolling mill of a certain steel mill as a treatment object, and the specific results are shown in table 1.
TABLE 1
。
As can be seen from Table 1, the utility model can effectively remove suspended matters and oil substances in wastewater of the finishing machine, reduce the influence of pollutants on the subsequent treatment process, and has obvious economic benefit.
It should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present utility model.
Claims (7)
1. A hot galvanizing finishing machine wastewater pretreatment system is characterized by comprising a screening device, a cyclone separation device and a magnetic separation device; the screening device comprises a screen (2), a collecting tank (5) and a water collecting tank (6); the cyclone separation device comprises a first cyclone (11) and a second cyclone (15); the collecting tank (5) is arranged beside the water collecting tank (6), the screen (2) is arranged above the water collecting tank (6), and the collecting tank (5) is connected to the upper part of the screen (2) through the water inlet pipe (1);
the first cyclone (11) is provided with a first cyclone water inlet (9), a first cyclone overflow port (10) and a first cyclone underflow port (23);
the second cyclone (15) is provided with a second cyclone water inlet (13), a second cyclone underflow port (17) and a second cyclone overflow port (14)
The bottom of the water collecting tank (6) is connected with a first cyclone water inlet (9) through a lifting pump (7) and a pipeline;
the first cyclone overflow port (10) is connected with the second cyclone water inlet (13) through the mixer (12);
the first cyclone underflow opening (23) is connected with the magnetic separation device, the second cyclone underflow opening (17) is connected with the water producing tank (26), and the second cyclone overflow opening (14) is connected with the slag collecting tank (24).
2. The hot galvanizing finishing machine waste water pretreatment system according to claim 1, wherein said magnetic separation device comprises a magnetic drum (21), a rotary brush (20), and a sludge discharge plate (22); an automatic sludge scraping device (29) is arranged on the sludge discharge plate (22), a sludge collecting tank (16) is arranged below the sludge discharge plate (22), and a magnetic separation water outlet (19) is arranged at the lower part of the magnetic separation device; a water inlet baffle (18) is arranged in the magnetic separation device.
3. The hot galvanizing finishing machine wastewater pretreatment system according to claim 1, characterized in that an overflow pipe (3) is arranged in the collecting tank (5), and the overflow pipe (3) is connected with a water collecting tank (6); and a drain valve (4) is arranged at the bottom of the collecting tank (5).
4. The hot galvanizing finishing machine wastewater pretreatment system according to claim 1, wherein the bottom of the water collecting tank (6) adopts a cone, and the included angle between the tank wall and the horizontal direction is 30-60 degrees; the upper part of the water collecting tank (6) is provided with a water collecting tank overflow pipe (8).
5. The hot galvanizing finishing machine wastewater pretreatment system according to claim 1, wherein the screen (2) is a fixed screen, the mesh opening is 3-5 mm, the screen (2) is obliquely installed, and the included angle between the screen and the horizontal direction is 30 degrees.
6. The hot galvanizing finishing machine wastewater pretreatment system according to claim 1, wherein a drainage pump (25) and a dissolved air pump (27) are arranged at the bottom of the water producing tank (26); the dissolved air pump (27) is connected with the water producing tank (26) through an air inlet (28) of the dissolved air pump; the outlet of the dissolved air pump (27) is connected with the mixer (12).
7. The hot galvanizing finishing machine waste water pretreatment system according to claim 1, wherein the underflow opening split ratio of the first cyclone (11) is less than 0.2, and the overflow opening split ratio of the second cyclone (15) is less than 0.1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320303029.1U CN219469859U (en) | 2023-02-24 | 2023-02-24 | Hot galvanizing finishing machine wastewater pretreatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320303029.1U CN219469859U (en) | 2023-02-24 | 2023-02-24 | Hot galvanizing finishing machine wastewater pretreatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219469859U true CN219469859U (en) | 2023-08-04 |
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ID=87439111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320303029.1U Active CN219469859U (en) | 2023-02-24 | 2023-02-24 | Hot galvanizing finishing machine wastewater pretreatment system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219469859U (en) |
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2023
- 2023-02-24 CN CN202320303029.1U patent/CN219469859U/en active Active
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Address after: 430081 No. 1244 Heping Avenue, Qingshan District, Hubei, Wuhan Patentee after: Zhonggang Wuhan Safety and Environmental Protection Research Institute Co.,Ltd. Country or region after: China Address before: No. 1244 Heping Avenue, Qingshan District, Hubei, Wuhan Patentee before: SINOSTEEL CORPORATION WUHAN SAFETY AND ENVIRONMENTAL PROTECTION RESEARCH INSTITUTE Co.,Ltd. Country or region before: China |
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