Magnetic separation device for wastewater pretreatment of cold rolling finishing machine

Abstract

The utility model discloses a magnetic separation device for wastewater pretreatment of a cold rolling finishing machine, and belongs to the technical field of environment-friendly sewage treatment. Comprising a wastewater input mechanism, a plurality of magnetic separation mechanisms, a sludge collection barrel and a wastewater discharge mechanism, the multiple magnetic separation mechanisms are arranged on the water outlet pool in the vertical direction, wastewater to be treated is conveyed into the magnetic separation mechanisms through the wastewater input mechanism to be subjected to magnetic separation treatment, sludge separated from the wastewater is collected into the sludge collecting barrel, and the wastewater subjected to magnetic separation treatment is conveyed to the next treatment unit through the wastewater discharge mechanism. According to the utility model, the magnetic separators and matched equipment are integrated on the water outlet tank, so that the occupied area of the equipment is effectively reduced, the magnetic separators are arranged in multiple groups, the processing capacity of each group is controlled within a proper range, and the magnetic separation effect is ensured. The operation is stable, and the automation degree is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmentally friendly sewage treatment, and in particular relates to a magnetic separation device for pre-treating wastewater from a cold rolling skin-pass mill. Background Art

[0002] Cold rolling skin-passing mills generally adopt wet skin-passing process, and skin-passing mill wastewater will be generated in the production process. The skin-passing mill wastewater generally contains pollutants such as residual skin-passing liquid, zinc powder, iron powder, engine oil and other impurities. Traditional skin-passing mill wastewater is generally sent to sewage treatment station for treatment. In the existing technology, membrane technology is generally used to reuse skin-passing mill wastewater. Membrane treatment technology only filters and concentrates skin-passing mill wastewater, and the concentrated wastewater is discharged to the sewage station. Suspended matter such as zinc powder and iron powder in the wastewater still needs to be treated.

[0003] The zinc powder and iron powder in the wastewater of the skin-finishing machine are in an alloy state and have the magnetism of iron powder. They can be removed by magnetic separation. The separated zinc powder and iron powder can be treated or reused separately, reducing the subsequent wastewater treatment costs. The existing magnetic separation device often uses a magnetic drum type device. The equipment has a small footprint and a low degree of automation. When used for the treatment of wastewater from the skin-finishing machine, zinc powder and iron powder are prone to adhesion and siltation, resulting in unstable wastewater treatment effects and increased maintenance times. Utility Model Content

[0004] Technical problem solved by the utility model: The utility model proposes a magnetic separation device for pretreatment of cold rolling skin-pass mill wastewater, which can achieve efficient removal of zinc powder and iron powder, reduce the equipment footprint, realize automatic operation and control, and reduce the number of maintenance times.

[0005] Technical solution: In order to solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0006] A magnetic separation device for pre-treatment of wastewater from a cold rolling skin-pass mill comprises a wastewater input mechanism, a plurality of magnetic separation mechanisms, a sludge collecting bucket and a wastewater discharge mechanism; the plurality of magnetic separation mechanisms are arranged on a water outlet pool in a vertical direction, the wastewater to be treated is transported to the magnetic separation mechanism through the wastewater input mechanism for magnetic separation treatment, the sludge separated from the wastewater is collected in the sludge collecting bucket, and the water after magnetic separation treatment is transported to the next treatment unit by the wastewater discharge mechanism.

[0007] Preferably, the wastewater input mechanism comprises a water inlet pipe, a water inlet valve, a flow meter and a water distribution pipe; the water inlet pipe is connected to the water inlet valve and the flow meter; one end of the water distribution pipe is connected to the water inlet pipe.

[0008] Preferably, the magnetic separation mechanism includes a frame and a magnetic separator arranged in the frame; the frame is U-shaped, including a first partition arranged at both ends of the magnetic drum and a second partition on the side where the water inlet pipe is located, and the first partition is connected to the second partition.

[0009] Preferably, the magnetic separator includes a reduction motor, a pressure roller, a scraper, a guide plate, a water inlet trough and a water outlet trough; the pressure roller is attached to the surface of the magnetic drum and connected to the first partition, the reduction motor is connected to the magnetic drum, the scraper is obliquely arranged on the first partition and one end of the scraper is in contact with the surface of the magnetic drum; the guide plate is arranged below the magnetic drum; the water inlet trough is arranged at the front end of the magnetic drum; the water outlet trough is arranged below the scraper.

[0010] Preferably, a mud guard is provided on the first partition plate close to the end of the mud scraper.

[0011] Preferably, a water outlet pipe is provided at one end of the water outlet trough, and the water outlet pipe passes through the first partition plate and is connected to the water outlet collecting pipe.

[0012] Preferably, the water distribution pipe is T-shaped, including a first water pipe vertically arranged on the second partition and a second water pipe parallel to the second partition.

[0013] Preferably, the wastewater discharge mechanism includes a water outlet lift pump, an aeration pipe, an air inlet pipe, an overflow pipe and a drain pipe; a water outlet lift pump and an aeration pipe are provided in the water outlet pool; an overflow pipe is provided on the water outlet pool; the water outlet lift pump is connected to the drain pipe, and the aeration pipe is connected to the air inlet pipe.

[0014] Preferably, the sludge collecting barrel is located below the mud shield, a tray is provided at the bottom end of the sludge collecting barrel, a bracket is provided on the tray, and a universal wheel is provided at the bottom end of the tray.

[0015] Preferably, the guide plate is cylindrical and coaxial with the magnetic drum.

[0016] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0017] (1) The utility model integrates the magnetic separator and supporting equipment on the water outlet tank, effectively reducing the equipment footprint. The magnetic separator is arranged in multiple groups, and the processing capacity of each group is controlled within an appropriate range to ensure the effect of magnetic separation. An aeration pipe is set in the water outlet tank, and compressed air is used for aeration and stirring to prevent suspended matter from settling and clogging.

[0018] (2) The magnetic separator of the utility model adopts perforated pipes to distribute water to prevent sludge from clogging the water inlet tank. A flow meter and a water inlet valve are arranged on the water inlet pipe to effectively adjust the water inlet flow of each group of magnetic separators. A mud shield is arranged outside the scraper to ensure the effective collection of sludge.

[0019] (3) The device has low operating energy consumption and stable treatment effect; the system can realize automatic control, occupies a small area and has high equipment integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a top view schematic diagram of the magnetic separator of the utility model;

[0022] Figure 3 It is a side view schematic diagram of the magnetic separator of the utility model;

[0023] In the figure: 1. water inlet pipe; 2. water inlet valve; 3. flow meter; 4. water distribution pipe; 41. first water pipe; 42. second water pipe; 5. reduction motor; 6. pressure roller; 7. magnetic roller; 8. scraper; 9. mud guard; 10. outlet water collecting pipe; 11. guide plate; 12. outlet pipe; 13. sludge collecting barrel; 14. outlet water lifting pump; 15. aeration pipe; 16. outlet pool; 17. air inlet pipe; 18. overflow pipe; 19. drain pipe; 20. water inlet trough; 21. outlet trough; 22. first partition; 23. second partition. DETAILED DESCRIPTION

[0024] The present invention will be further explained below in conjunction with specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0025] like Figure 1-3 As shown, the present application proposes a magnetic separation device for pre-treatment of wastewater from a cold rolling skin-pass mill, comprising a wastewater input mechanism, a plurality of magnetic separation mechanisms, a sludge collection bucket 13 and a wastewater discharge mechanism.

[0026] like Figure 1 , 2 As shown, the wastewater input mechanism includes an inlet pipe 1, an inlet valve 2, a flow meter 3 and a water distribution pipe 4; the inlet pipe 1 is connected with the inlet valve 2 and the flow meter 3; the water distribution pipe 4 is T-shaped, including a first water pipe 41 vertically arranged on the second partition 23 and a second water pipe 42 connected to the first water pipe 41 and parallel to the second partition 23, and the first water pipe 41 of the water distribution pipe 4 is connected to the inlet pipe 1 through a flange.

[0027] The length of the second water pipe 42 of the water distribution pipe 4 is 5 to 6 cm shorter than that of the magnetic drum 7. The second water pipe of the water distribution pipe 4 is provided with a plurality of water outlet holes. The aperture of the water outlet holes is 4 to 6 mm. The water outlet holes form an angle of 45° with the vertical direction, and the water outlet holes are symmetrically arranged on both sides of the vertical direction.

[0028] The end of the water inlet pipe 1 is connected to the water inlet pump, which is turned on. The water inlet valve 2 is adjusted to transport the wastewater to be treated through the water inlet pipe 1 to the water distribution pipe 4, and then transported to the magnetic separation mechanism by the water distribution pipe 4. The water inlet amount of each magnetic separation mechanism is monitored and controlled by the flow meter 3 on the water inlet pipe 1.

[0029] In this embodiment, the number of water outlet holes on the second water pipe 42 is 20 to 30.

[0030] like Figure 1-3 As shown, there are multiple magnetic separation mechanisms, which are arranged on the water outlet pool 16 in a vertical direction; the magnetic separation mechanism includes a frame and a magnetic separator arranged in the frame; the frame is U-shaped, and is composed of multiple partitions, including a first partition 22 arranged at both ends of the magnetic drum 7 and a second partition 23 on the side where the water inlet pipe 1 is located, and the first partition 22 is connected to the second partition 23, and the partition plays a sealing and supporting role.

[0031] In this embodiment, the number of magnetic separation mechanisms is three, and the processing capacity of a single magnetic separation mechanism is 3 to 6 m 3 / h.

[0032] The magnetic separator includes a reduction motor 5, a pressure roller 6, a magnetic drum 7, a scraper 8, a guide plate 11, an inlet trough 20 and an outlet trough 21; the magnetic drum 7 is fixedly connected to the first partitions 22 on both sides thereof, the pressure roller 6 is attached to the surface of the magnetic drum 7 and fixedly connected to the first partition 22, the reduction motor 5 is fixedly connected to the outer side wall of the first partition 22, the reduction motor 5 is connected to the magnetic drum 7 through a chain, the scraper 8 is obliquely arranged on the partitions on both sides of the magnetic drum 7, and one end of the scraper 8 is in contact with the surface of the magnetic drum 7.

[0033] A guide plate 11 is provided below the magnetic drum 7 . The guide plate 11 is a cylindrical surface and is coaxial with the magnetic drum 7 . The diameter of the guide plate 11 is 1 to 2 cm larger than that of the magnetic drum 7 .

[0034] A water inlet trough 20 is provided at the front end of the magnetic drum 7, and the other end of the water inlet trough 20 is connected to the second partition 23. The water inlet trough 20 is semi-cylindrical, and the second water pipe of the water distribution pipe 4 is arranged in the water inlet trough 20. The diameter of the water inlet trough 20 is 4-5 cm larger than the diameter of the water distribution pipe 4. A water outlet trough 21 is provided below the scraper 8 and the magnetic drum 7; one end of the water outlet trough 21 is connected to the water outlet pipe 12, and the water outlet pipe 12 passes through the first partition 22 and is connected to the water outlet collection pipe 10 through a flange.

[0035] A mud shield 9 is installed on the first partition 22 near the end of the scraper 8. The bottom of the mud shield 9 is a prism-shaped structure. The mud shield 9 is fixedly connected to the first partition 22 by screws, which is convenient for disassembly and assembly. A sludge collection bucket 13 is provided below the mud shield 9. The sludge collection bucket 13 is placed on a pallet. The pallet is provided with a bracket, and the sludge collection bucket 13 can be moved by a forklift. The bottom of the pallet is provided with universal wheels for easy movement.

[0036] The wastewater to be treated is transported to the water inlet trough 20 of the frame through the water distribution pipe 4, and the reduction motor 5 is started. The wastewater in the water inlet trough 20 overflows onto the guide plate 11. The wastewater contacts the magnetic roller 7 when passing through the guide plate 11, and the magnetic roller 7 is driven to rotate by the reduction motor 5. The zinc powder and iron powder mixture in the wastewater is attracted and separated by the magnetic roller 7. The separated zinc powder and iron powder are adsorbed on the magnetic roller 7, and are squeezed and dehydrated by the pressure roller 6. The sludge on the magnetic roller 7 is scraped off by the scraper 8, and the sludge on the scraper 8 falls into the mud shield 9 and enters the sludge collecting barrel 13 from the mud shield 9. The wastewater after magnetic separation treatment passes through the outlet trough 21, the outlet pipe 12, and the outlet collecting pipe 10 and enters the outlet pool 16.

[0037] In this embodiment, the surface of the magnetic drum 7 is made of stainless steel, the magnetic induction intensity of the surface of the magnetic drum 7 is 3000-3500Gs, the pressure roller 6 is made of rubber, and the contact parts between the scraper blade 8 and the magnetic drum 7 are made of copper; the scraper blade 8 is fixed to the partition by screws, and the position and inclination of the scraper blade 8 can be adjusted.

[0038] In this embodiment, the water inlet amount of each group of magnetic separators is controlled by the flow inlet valve 2, and the wastewater enters the water inlet trough 20 from the water outlet hole of the second water pipe of the water distribution pipe 4, and the wastewater in the water inlet trough 20 overflows into the guide plate 11 at the bottom of the magnetic drum 7.

[0039] In this embodiment, the bottom height of the water outlet pipe 12 is the same as the bottom height of the water outlet trough 21, the width of the water outlet trough 21 is 1.5 to 2 times the diameter of the water outlet pipe 12, and the height of the water outlet trough 21 is the same as the height of the outlet of the guide plate 11.

[0040] like Figure 1 As shown, the wastewater discharge mechanism includes a water outlet lift pump 14 , an aeration pipe 15 , a water outlet pool 16 , an air inlet pipe 17 , an overflow pipe 18 and a drain pipe 19 .

[0041] The bottom of the effluent collecting pipe 10 is placed in the effluent pool 16, in which an effluent lifting pump 14 and an aeration pipe 15 are provided, and an overflow pipe 18 is provided on the upper part of the effluent pool 16; the effluent lifting pump 14 is connected to the drain pipe 19, and the effluent lifting pump 14 is started to discharge the wastewater in the effluent pool 16 through the drain pipe 19; the aeration pipe 15 is connected to the air inlet pipe 17, and the aeration pipe 15 is evenly arranged at the bottom of the effluent pool 16, and the aeration pipe 15 is provided with aeration holes, which are upward at an angle of 15° with the horizontal direction, and the size of the aeration holes is 4 to 6 mm, and one end of the aeration pipe 15 is connected to the air inlet pipe 17, and the air inlet pipe 17 is connected to compressed air, and the pressure of the compressed air is 0.4 to 0.8 MPa.

[0042] In this embodiment, the hydraulic retention time of the outlet pool 16 is 15 to 30 minutes, and the aeration intensity of the outlet pool 16 is controlled at 0.5 to 2 L / (m 2 ·s), a liquid level meter is installed in the water outlet pool 16, and the start and stop of the water outlet lift pump 14 is controlled by the liquid level meter.

[0043] In this embodiment, the water outlet lifting pump 14 is a submersible sewage pump, and the flow-through components of the water outlet lifting pump 14 are made of wear-resistant material.

[0044] The working principle or use process of the utility model is as follows: first, the water inlet pump is started, the water inlet valve 2 is adjusted, and the water inlet flow rate of each group of magnetic separation mechanisms is controlled to be similar, and the wastewater to be treated is transported from the water inlet pipe 1 and the water distribution pipe 4 to the water inlet trough 20 of the magnetic separation mechanism. The wastewater in the water inlet trough 20 overflows onto the guide plate 11. When the wastewater passes through the guide plate 11, it contacts the magnetic roller 7. The magnetic roller 7 attracts the zinc powder and iron powder in the wastewater to be treated. Under the action of magnetic force, the zinc powder and iron powder are separated from the wastewater. The separated zinc powder and iron powder are adsorbed on the magnetic roller 7, and are squeezed and dehydrated by the pressure roller 6. The sludge on the magnetic roller 7 is scraped off by the scraper plate 8. The sludge falls into the mud shield 9, and enters the sludge collecting barrel 13 from the mud shield 9. The effluent after magnetic separation enters the water outlet trough 21, and the water outlet trough 21 is connected to the water outlet pipe 12. The effluent of each group of magnetic separators enters the water outlet collecting pipe 10 from the water outlet pipe 12, and then falls into the water outlet pool 16 from the water outlet collecting pipe 10. A liquid level gauge is installed in the water outlet pool 16, and the operation of the water outlet lifting pump 14 is controlled by the liquid level gauge. When the liquid level is low, the water outlet lifting pump 14 stops, and when the liquid level is high, the water outlet lifting pump 14 starts. The aeration pipe 15 in the water outlet pool 16 stirs the wastewater through compressed air, and the wastewater discharged by the water outlet lifting pump 14 enters the next treatment unit through the drain pipe 19.

[0045] The magnetic separation device for cold rolling skin-pass mill wastewater pretreatment proposed by the utility model can effectively remove the mixture of zinc powder and iron powder in the wastewater, and the equipment occupies a small area, has low operating cost, stable treatment effect and high automation.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A magnetic separation device for pretreatment of cold rolling skin-pass mill wastewater, characterized in that: The invention comprises a wastewater input mechanism, a plurality of magnetic separation mechanisms, a sludge collection bucket (13) and a wastewater discharge mechanism; the plurality of magnetic separation mechanisms are arranged on a water outlet pool (16) in a vertical direction, the wastewater to be treated is transported to the magnetic separation mechanism through the wastewater input mechanism for magnetic separation treatment, the sludge separated from the wastewater is collected in the sludge collection bucket (13), and the wastewater after magnetic separation treatment is transported to the next treatment unit through the wastewater discharge mechanism.

2. A magnetic separation device for pretreatment of cold rolling skin-pass mill wastewater according to claim 1, characterized in that: The wastewater input mechanism comprises a water inlet pipe (1), a water inlet valve (2), a flow meter (3) and a water distribution pipe (4); the water inlet pipe (1) is connected to the water inlet valve (2) and the flow meter (3); one end of the water distribution pipe (4) is connected to the water inlet pipe (1).

3. The magnetic separation device for pretreatment of cold rolling skin-pass mill wastewater according to claim 1, characterized in that: The magnetic separation mechanism comprises a frame and a magnetic separator arranged in the frame; the frame is U-shaped and comprises a first partition (22) arranged at both ends of the magnetic drum (7) and a second partition (23) on the side where the water inlet pipe (1) is located, and the first partition (22) is connected to the second partition (23).

4. The magnetic separation device for pretreatment of cold rolling skin-pass mill wastewater according to claim 3, characterized in that: The magnetic separator comprises a reduction motor (5), a pressure roller (6), a scraper (8), a guide plate (11), a water inlet trough (20) and a water outlet trough (21); the pressure roller (6) is attached to the surface of the magnetic roller (7) and connected to the first partition plate (22); the reduction motor (5) is connected to the magnetic roller (7); the scraper (8) is obliquely arranged on the first partition plate (22) and one end of the scraper (8) is in contact with the surface of the magnetic roller (7); the guide plate (11) is arranged below the magnetic roller (7); the water inlet trough (20) is arranged at the front end of the magnetic roller (7); and the water outlet trough (21) is arranged below the scraper (8).

5. The magnetic separation device for pretreatment of cold rolling skin-pass mill wastewater according to claim 4, characterized in that: A mud shield (9) is provided on the first partition plate (22) close to the end of the mud scraper (8).

6. The magnetic separation device for pretreatment of cold rolling skin-pass mill wastewater according to claim 4, characterized in that: A water outlet pipe (12) is provided at one end of the water outlet trough (21), and the water outlet pipe (12) passes through the first partition plate and is connected to the water outlet collecting pipe (10).

7. The magnetic separation device for pretreatment of cold rolling skin-pass mill wastewater according to claim 2, characterized in that: The water distribution pipe (4) is T-shaped and comprises a first water pipe (41) vertically arranged on the second partition plate (23) and a second water pipe (42) parallel to the second partition plate (23).

8. The magnetic separation device for pretreatment of cold rolling skin-pass mill wastewater according to claim 1, characterized in that: The wastewater discharge mechanism comprises a water outlet lift pump (14), an aeration pipe (15), an air inlet pipe (17), an overflow pipe (18) and a drainage pipe (19); the water outlet lift pump (14) and the aeration pipe (15) are arranged in the water outlet pool (16); the overflow pipe (18) is arranged on the water outlet pool (16); the water outlet lift pump (14) is connected to the drainage pipe (19), and the aeration pipe (15) is connected to the air inlet pipe (17).

9. The magnetic separation device for pretreatment of cold rolling skin-pass mill wastewater according to claim 1, characterized in that: The sludge collection barrel (13) is located below the mud shield (9), a tray is provided at the bottom end of the sludge collection barrel (13), a bracket is provided on the tray, and a universal wheel is provided at the bottom end of the tray.

10. The magnetic separation device for pretreatment of cold rolling skin-pass mill wastewater according to claim 4, characterized in that: The guide plate (11) is cylindrical and coaxial with the magnetic roller (7).

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