Composite belt type filtering device

Abstract

A composite belt type filtering device is characterized in that a water distributor is mounted at a liquid inlet above an iron powder solution treatment box, a pair of electric rollers are arranged in the iron powder solution treatment box, a corrugated belt is mounted on the two electric rollers in a winding manner, and a flange is arranged at the edge of the outer side of the corrugated belt; a pair of magnetic electric rollers is installed on the inner side of the corrugated belt and located between the two electric rollers, and a strong magnetic plate belt is installed on the magnetic electric rollers in a winding mode and tightly attached to the lower surface of the corrugated belt; one end of the scraper is attached to the surface of the corrugated belt, and the other end of the scraper obliquely extends to the position above a feeding port of the auger conveying device through the iron powder outlet. Through the design of a composite adsorption and transmission structure, iron powder in alkali liquor is efficiently filtered, firmly adsorbed, stably transmitted and intensively collected, and meanwhile, waste liquor is prevented from splashing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment of galvanizing production line. BACKGROUND

[0002] In the galvanizing production process, the cleaning section will produce alkaline wastewater containing a large amount of iron powder. If these iron powders are not filtered and removed in time, they will be recycled or discharged with the wastewater, which not only affects the surface quality of the galvanized product, leading to poor adhesion of the coating and scratches, but also may block the pipeline, valves and other equipment of the production line, reduce production efficiency and increase equipment maintenance cost.

[0003] At present, the existing alkaline iron powder filtering device of the cleaning section of the galvanizing production line mostly uses imported magnetic rod filtering method. However, this magnetic rod filtering device has the problems of low adsorption force of the magnetic rod body, incomplete cleaning of the iron powder on the magnetic rod body, low efficiency and influence on product quality. In addition, some devices also have the problems of waste liquid splashing, environmental pollution and incomplete collection of iron powder. SUMMARY

[0004] In order to overcome the defects of low filtering efficiency, easy damage of equipment, easy falling of iron powder and environmental pollution of the existing alkaline iron powder filtering device of the galvanizing production line, the present application provides a composite belt type filtering device.

[0005] The technical scheme adopted by the present application to achieve the above-mentioned purpose is: a composite belt type filtering device, a water distributor 2 is installed at the liquid inlet of the top of the iron powder solution treatment box 12, and the water distributor 2 is connected with the iron-containing wastewater pipeline 1 of the production line; a wastewater outlet 18 is arranged at the bottom of one end of the iron powder solution treatment box 12, an iron powder outlet 17 is arranged at the other end of the iron powder solution treatment box 12, and a pair of electric rollers 4 is arranged inside the iron powder solution treatment box 12; the electric roller 4 near the iron powder outlet is higher than the electric roller 4 near the wastewater outlet 18, and the electric roller 4 is connected with a motor; the roller shaft of the electric roller 4 is installed on the box body on the left and right sides of the iron powder solution treatment box 12, a corrugated belt 16 is installed in a winding manner on the two electric rollers 4, and a flange 3 is arranged at the outer edge of the corrugated belt 16; a pair of magnetic electric rollers 6 is installed between the two electric rollers 4 at the inner side of the corrugated belt 16, a strong magnetic plate belt 5 is installed in a winding manner on the magnetic electric roller 6, and the strong magnetic plate belt 5 is tightly attached to the lower surface of the corrugated belt 16; a scraper 7 is installed on the iron powder solution treatment box 12, one end of the scraper 7 is attached to the surface of the corrugated belt 16, and the other end of the scraper 7 extends obliquely above the auger conveyor device inlet 14 of the auger conveyor device 8 through the iron powder outlet 13.

[0006] A iron powder collection box 9 is arranged below the auger conveyor device outlet 15 of the auger conveyor device 8.

[0007] A liquid receiving circulating tank 10 is arranged below the wastewater outlet 18, and the outlet of the liquid receiving circulating tank 10 is connected with the return pipeline 11 of the production line.

[0008] The spray hole diameter of the water distributor 2 is 3-5mm, and the distance between adjacent spray holes is 10-15mm.

[0009] The corrugated belt 16 and the retaining edge 3 are made of stainless steel, and the height of the retaining edge (3) is 50-80mm.

[0010] The strong magnetic plate belt 5 is spliced by a plurality of independent strong magnetic blocks, the magnetic field strength of the strong magnetic block is not less than 8000 Gauss, and the magnetic poles of adjacent strong magnetic blocks are alternately arranged.

[0011] The top of the iron powder solution treatment box 12 is provided with an exhaust port.

[0012] The composite belt filter device of the application realizes efficient filtration, firm adsorption, stable transmission and centralized collection of iron powder in lye, and prevents waste liquid from splashing. The adsorption filtration rate of the device for iron powder can reach 98.5%, the iron powder content in the filtered sewage is less than 5mg / L, which meets the recycling requirement of the galvanizing production line; the device runs stably, there is no waste liquid splashing phenomenon, the iron powder is collected completely, the maintenance period can reach one month, and the production and maintenance cost is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the principle diagram of the composite belt filter device of the application.

[0014] In the figure: 1, production line iron-containing sewage pipeline, 2, water distributor, 3, retaining edge, 4, electric roller, 5, strong magnetic plate belt, 6, magnetic electric roller, 7, scraper, 8, auger conveying mechanism, 9, iron powder collection box, 10, liquid receiving circulating tank, 11, return production line pipeline, 12, iron powder solution treatment box, 13, iron powder outlet, 14, auger conveying mechanism feed inlet, 15, auger conveying mechanism discharge outlet, 16, corrugated belt, 17, iron powder outlet, 18, sewage outlet. DETAILED DESCRIPTION

[0015] The composite belt filter device of the application is as shown in Figure 1As shown, the pipeline 1 of the production line containing iron sewage adopts a DN100 stainless steel pipe as the water inlet source of the device, and the outlet end thereof is connected with the water distributor 2 through a flange to transport the iron-containing alkaline sewage of the cleaning section of the galvanizing production line to the water distributor 2. The water distributor 2 has a cuboid structure and is arranged above the corrugated belt 16, and is internally provided with a shunt cavity and uniformly distributed spray holes for uniformly distributing and spraying the sewage transported by the pipeline of the production line containing iron sewage on the corrugated belt 16; the spray holes of the water distributor have a diameter of 3-5 mm, and the spacing between adjacent spray holes is 10-15 mm, so as to ensure that the sewage can uniformly cover the entire width direction of the corrugated barrier belt. As the main conveying mechanism for filtering the iron powder 13, the horizontal arrangement is arranged inside the iron powder solution treatment box 12, and both sides thereof are provided with corrugated barriers 3 for carrying the iron powder in the sewage and stably transporting the iron powder to the scraper 7 to prevent the sewage from overflowing from both sides during the transmission process; the height of the barrier 3 is 50-80 mm, the belt body is made of stainless steel, and the surface is subjected to sand blasting treatment to increase the adhesion of the iron powder. The width of the corrugated belt 16 is 800 mm. The type of the electric roller 4 is TDY75-500, the power is 1.5 kW, and two groups of electric rollers are respectively installed at the input end and the output end of the corrugated belt 16 to drive the corrugated belt to circulate and provide operating power for the corrugated belt, and drive the corrugated barrier belt 3 to circulate at a speed of 0.5 m / s.

[0016] The strong magnetic plate belt 5 is arranged inside the iron powder solution treatment box 12 and runs below and closely adheres to the lower surface of the corrugated barrier belt 16, which is the adsorption power source of the iron powder. The running speed, frequency and direction of the strong magnetic plate belt are completely consistent with those of the corrugated barrier belt, which is used to generate a strong magnetic field to adsorb the iron powder in the sewage, so that the iron powder is firmly attached to the upper surface of the corrugated barrier belt. The strong magnetic plate belt 5 is spliced by a plurality of neodymium iron boron strong magnetic blocks with a magnetic field strength of 18000 Gauss. The magnetic poles of adjacent strong magnetic blocks are arranged alternately to ensure that the magnetic field on the surface of the corrugated barrier belt is uniformly distributed. The width of the strong magnetic plate belt 5 is consistent with that of the corrugated barrier belt 3 and is installed closely to the lower surface of the corrugated barrier belt 3. The magnetic motor roller 6 is the same type as the motor roller 4 and is arranged at the input end and the output end of the strong magnetic plate belt respectively. The strong magnetic plate belt and the corrugated belt 16 are driven to run synchronously and circularly by the motor, which provides the main driving force for the strong magnetic plate belt to drive the strong magnetic plate belt 5 and the corrugated barrier belt 3 to run synchronously and at the same speed. The scraper 7 is made of wear-resistant rubber material and is arranged obliquely below the output end of the corrugated belt 16. The blade edge of the scraper closely adheres to the upper surface of the corrugated barrier belt and is used to automatically scrape the adsorbed iron powder on the corrugated barrier belt. The inclination angle of the scraper 7 is 30°. The auger conveying mechanism 8 is model LS-200 with a power of 0.75kW. The feeding port 14 is located directly below the scraper 7, and the discharge port 15 is connected with the feeding port at the top of the iron powder collecting box 9, which is used to convey the iron powder scraped by the scraper to the iron powder collecting box. The iron powder collecting box 9 is arranged outside the iron powder solution treatment box 12. The top of the iron powder collecting box 9 is provided with a feeding port connected with the discharge port of the auger conveying mechanism, and the bottom is provided with an openable discharge door, which is used to receive and store the iron powder conveyed by the auger conveying mechanism 8. The iron powder collecting box 9 is a stainless steel box with a volume of 1m³. The bottom is provided with a pneumatic discharge door, which is convenient for discharging the iron powder. The liquid receiving circulating tank 10 is arranged below the iron powder solution treatment box 12 and has a funnel-shaped structure. The bottom outlet is connected with the return production line pipeline 11, which is used to receive the filtered sewage and a small amount of waste liquid dropped during the scraping process of the scraper 7. The inside of the liquid receiving circulating tank is provided with a filter screen, which is used to perform secondary filtration on the collected sewage to remove residual fine iron powder particles. The liquid receiving circulating tank 10 is a funnel-shaped stainless steel structure. The inside is provided with a 80-mesh stainless steel screen 101. The bottom outlet is connected with the return production line pipeline 11 through a DN80 pipeline. One end of the return production line pipeline 11 is connected with the bottom outlet of the liquid receiving circulating tank, and the other end is connected with the wastewater transfer box of the main production line, which is used to return the filtered sewage collected by the liquid receiving circulating tank 10 to the main production line for recycling.

[0017] The working process is as follows: 1. Start the device: turn on the motor roller 4 and the magnetic motor roller 6 to make the corrugated belt 3 and the strong magnetic plate belt 5 run synchronously and circularly at a speed of 0.5m / s; 2. Sewage conveying and water distribution: the iron-containing alkaline sewage in the galvanizing production line cleaning section enters the water distributor 2 through the production line iron-containing sewage pipeline 1 and is uniformly sprayed on the corrugated belt 16 through the spray holes. 3. Iron powder adsorption and transmission: The iron powder in the sewage is firmly adsorbed on the upper surface of the corrugated strip 16 under the action of the strong magnetic field of the strong magnetic plate strip 5 and is transmitted to the output end with the corrugated baffle strip 3; 4. Iron powder scraping and collection: When the corrugated strip 16 adsorbed with iron powder runs to the output end, the scraper 7 scrapes off the iron powder, which falls into the feed inlet of the auger conveying mechanism 8 and is conveyed to the iron powder collection box 9 for storage, and is discharged through the bottom discharge door regularly; 5. Sewage circulation: The filtered sewage falls into the liquid receiving circulation tank 10 below, is filtered again through the filter screen 101, and is conveyed to the main production line wastewater transfer box for circulation through the return production line pipeline 11; 6. Operation monitoring and maintenance: The running state is monitored through the observation window monitoring device on the iron powder solution treatment box, and the scraper 7, filter screen and other components are checked and maintained regularly through the maintenance door.

[0018] Advantages of the present application: 1. High filtration efficiency: The strong magnetic plate strip and the corrugated baffle strip are designed in combination in the present application, the strong magnetic field generated by the strong magnetic plate strip can efficiently adsorb the iron powder in the sewage on the corrugated baffle strip, the adsorption rate can reach more than 98%, which is much higher than that of the existing general filter device; at the same time, the uniform water distribution design of the water distributor enables the sewage to fully contact with the corrugated baffle strip, further improving the filtration effect; 2. Stable iron powder transmission: The strong magnetic plate strip and the corrugated baffle strip run synchronously and at the same speed, and the corrugated baffle on both sides of the corrugated baffle strip can effectively prevent the iron powder and the sewage from falling off or overflowing during the transmission process, ensuring stable transportation of the iron powder to the scraper; 3. Good environmental protection: The closed structure of the iron powder solution treatment box can effectively prevent waste liquid from splashing and avoid pollution of the production environment; at the same time, the filtered sewage is recycled through the return production line pipeline, realizing the reuse of water resources and reducing sewage discharge; 4. Convenient maintenance: The device structure is reasonably designed, the scraper is made of wear-resistant rubber material and has a long service life; the discharge door at the bottom of the iron powder collection box facilitates the centralized cleaning of the iron powder, and the secondary filter screen in the liquid receiving circulation tank can be regularly disassembled and cleaned, reducing the maintenance cost; 5. Strong applicability: The running speed of the electric roller and the magnetic electric roller can be adjusted according to the sewage flow of the galvanizing production line, which can adapt to the production line requirements of different capacities and has wide applicability.

Claims

1. A composite belt filter apparatus, characterized by: The water distributor (2) is installed above the liquid inlet of the iron powder solution treatment box (12), and the water distributor (2) is connected with the production line iron-containing sewage pipeline (1); the sewage outlet (18) is arranged at the bottom of one end of the iron powder solution treatment box (12), the iron powder outlet (17) is arranged at the other end of the iron powder solution treatment box (12), and the electric roller (4) is arranged in the iron powder solution treatment box (12); the electric roller (4) near the iron powder outlet is higher than the electric roller (4) near the sewage outlet (18), and the electric roller (4) is connected with the motor; the roller shaft of the electric roller (4) is installed on the box body on the front and rear sides of the iron powder solution treatment box (12), the corrugated belt (16) is installed on the two electric rollers (4) in a winding mode, and the edge (3) is arranged at the outer side edge of the corrugated belt (16); the magnetic electric roller (6) is arranged between the two electric rollers (4) on the inner side of the corrugated belt (16), the strong magnetic plate belt (5) is arranged on the magnetic electric roller (6) in a winding mode, and the strong magnetic plate belt (5) is tightly attached to the lower surface of the corrugated belt (16); the scraper (7) is installed on the iron powder solution treatment box (12), one end of the scraper (7) is attached to the surface of the corrugated belt (16), and the other end of the scraper (7) extends above the auger conveyor device inlet (14) of the auger conveyor device (8) through the iron powder outlet (13).

2. A composite belt filter apparatus according to claim 1, wherein: The auger conveyor device (8) is provided with the iron powder collection box (9) below the auger conveyor device outlet (15).

3. The composite belt filter apparatus of claim 1, wherein: The liquid receiving circulating tank (10) is arranged below the sewage outlet (18), and the outlet of the liquid receiving circulating tank (10) is connected with the return production line pipeline (11).

4. The composite belt filter apparatus of claim 1, wherein: The spray hole diameter of the water distributor (2) is 3-5mm, and the distance between adjacent spray holes is 10-15mm.

5. The composite belt filter apparatus of claim 1, wherein: The corrugated belt (16) and the edge (3) are made of stainless steel, and the height of the edge (3) is 50-80mm.

6. The composite belt filter apparatus of claim 1, wherein: The strong magnetic plate belt (5) is formed by splicing a plurality of independent strong magnetic blocks, the magnetic field strength of the strong magnetic block is not less than 8000 Gauss, and the magnetic poles of adjacent strong magnetic blocks are arranged alternately.

7. The composite belt filter apparatus of claim 1, wherein: The iron powder solution treatment box (12) is provided with an exhaust port at the top.

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