Treatment device for recycling aluminum-containing sewage

Abstract

The utility model relates to the field of water treatment equipment, in particular to a treatment device for recycling aluminum-containing sewage, which comprises a pretreatment unit, a flocculation unit, a pressurization unit and a slag-water separation unit, and a water inlet of the flocculation unit is communicated with the pretreatment unit; the slag-water separation unit is provided with a clear water collection tank, a scum separation tank and a scum collection tank; a barrel is arranged in a tank body of the scum separation tank, and a water inlet header pipe of a water inlet pipe assembly is arranged in the barrel; a water inlet of the pressurizing unit is communicated with the clear water collecting tank, a water outlet of the pressurizing unit and a water outlet of the flocculation unit are both communicated with a water inlet header pipe, a water inlet pipe assembly can feed clear water dissolved with compressed air and flocculation sewage into a barrel of the scum separating tank for pressure reduction and enables aluminum-containing flocculation residues to float upwards, and the scum separating tank can separate the clear water from scum. According to the aluminum-containing sewage treatment device, the aluminum-containing sewage treatment device is improved, so that the operation time of sewage treatment can be shortened, and the treatment efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the field of water treatment equipment, in particular to a treatment device for reusing aluminum-containing sewage. Background Art

[0002] In the production process of aluminum products or in the chemical industry using aluminum-containing catalysts, a large amount of aluminum-containing sewage is often generated. The sewage cannot be reused without treatment, and if directly discharged, it will seriously pollute the environment. Aluminum hydroxide, which is likely to form oily expansion slag and mud slag, exists in large quantities in aluminum-containing sewage and is not easy to remove during sewage treatment. Currently, in sewage treatment, flocculation is often used to coagulate the aluminum-containing slag in the sewage and then let it settle naturally. Part of the floating slag floating to the surface is collected by manual or equipment and then centrally treated. Although the method of natural sedimentation after flocculation can achieve slag-water separation, its static settlement time is often long, affecting the sewage treatment efficiency. In view of this, if the treatment device for aluminum-containing sewage can be improved, the clear water dissolved with high-pressure air can be fully mixed with the flocculated sewage and sent into a pool for pressure reduction and release, and a large number of bubbles generated when the water mixed with high-pressure air is released are used to drive the aluminum-containing flocculated residue to float rapidly, and the floating slag is automatically fished by a fishing device to shorten the operation time and improve the sewage treatment efficiency. This is the problem to be solved in this case. Summary of the Utility Model

[0003] To overcome the deficiencies in the prior art, the utility model discloses a treatment device for reusing aluminum-containing sewage, which includes a pretreatment unit, a flocculation unit, a pressurization unit, and a slag-water separation unit. The water inlet of the flocculation unit is communicated with the pretreatment unit; the pressurization unit is provided with a pressure water tank that can mix compressed air and water liquid under high pressure. The slag-water separation unit is provided with a clear water collection pool, a floating slag separation pool, and a floating slag collection pool. Inside the tank body of the floating slag separation pool, there is a vertically penetrating cylinder, and an L-shaped water inlet fitting is arranged in the cylinder; the water inlet of the pressurization unit is communicated with the clear water collection pool, and its water outlet and the water outlet of the flocculation unit are both communicated with the water inlet main pipe of the water inlet fitting arranged in the slag-water separation unit. The water inlet fitting can send the clear water dissolved with compressed air and the flocculated sewage into the cylinder of the floating slag separation pool for pressure reduction and make the aluminum-containing flocculated residue float. The floating slag separation pool can separate the clear water from the floating slag. The clear water can overflow into the clear water collection pool, and the floating slag can be transferred to the floating slag collection pool by a floating slag fishing assembly. By improving the treatment device for aluminum-containing sewage, the utility model can shorten the operation time of sewage treatment and improve the treatment efficiency.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A treatment device for the reuse of aluminum-containing sewage, including a pretreatment unit. The pretreatment unit includes a sewage collection component, an oil-water separation component, an acid-base neutralization component, and a cooling component. The pretreatment unit can perform oil-water separation, acid-base neutralization, and cooling on the aluminum-containing sewage. It is characterized in that it further includes a flocculation unit, a pressurization unit, and a slag-water separation unit. The flocculation unit is provided with a tank body with an inlet and an outlet for carrying out a flocculation reaction on the sewage, and its inlet is communicated with the pretreatment unit. The pressurization unit is provided with a pressure water tank with an inlet, an air inlet, and an outlet for mixing compressed air and water liquid under high pressure. The slag-water separation unit is provided with three tank bodies that can respectively hold clear water, sewage, and floating slag. Inside the tank body for holding sewage in the middle, there is a vertically penetrating cylinder, and an L-shaped water inlet pipe is arranged in the cylinder. The inlet of the pressurization unit is communicated with the tank body for holding clear water of the slag-water separation unit, and the outlet of the pressurization unit and the outlet of the flocculation unit are both communicated with the water inlet pipe arranged by the slag-water separation unit. This water inlet pipe can send the clear water dissolved with compressed air and the flocculated sewage into the cylinder of the slag-water separation unit for pressure reduction and make the aluminum-containing flocculated residue float. The slag-water separation unit can separate the clear water and the floating slag and transfer them to the tank bodies for holding clear water and holding floating slag respectively.

[0006] The slag-water separation unit includes a floating separation component. The floating separation component is provided with a floating slag separation pool, a clear water collection pool, and a floating slag collection pool. The clear water collection pool and the floating slag collection pool are respectively arranged on both sides of the floating slag separation pool. There are several overflow holes in the upper part of the pool wall where the floating slag separation pool is connected to the clear water collection pool. The overflow holes are small holes that allow water liquid to flow through while floating slag cannot pass through.

[0007] The floating slag separation pool is a double-layer component composed of a tank body that can hold sewage and a cylinder suspended and fixed in the middle of the tank body. The upper and lower parts of the cylinder are both open. The bottom wall of the tank body is flat, and there is a downward concave sludge collection tank and a sewage discharge port with a valve on the bottom wall.

[0008] The bottom wall of the floating slag collection pool is provided with a sewage discharge port with a valve.

[0009] The slag-water separation unit further includes an inlet pipe assembly and an outlet pipe. The inlet pipe assembly is in an L-shaped structure. The inlet pipe assembly passes through and is fixed on the tank wall of the floating slag separation pool, and its vertical end is inserted into the cylinder of the floating slag separation pool. The outlet pipe passes through and is fixed on the lower part of the pool wall of the clear water collection pool.

[0010] The described water inlet pipe assembly includes a first water inlet pipe, a second water inlet pipe, a water inlet main pipe, a diffuser cover, and a check valve. The water inlet main pipe is an L-shaped pipe including a horizontal pipe and a vertical pipe. One ends of the first water inlet pipe and the second water inlet pipe are both connected to the horizontal pipe end of the water inlet main pipe. The diffuser cover is fixedly connected to the vertical pipe end of the water inlet main pipe. There are two check valves, and the two check valves are respectively connected to the first water inlet pipe and the second water inlet pipe to limit the reverse flow of the water liquid in the first water inlet pipe and the second water inlet pipe.

[0011] The described diffuser cover is a conical member surrounded by a bottom wall and a conical wall. A number of small holes are densely arranged on its conical wall. The vertical pipe of the water inlet main pipe is fixedly connected to the bottom wall of the diffuser cover and is communicated with the diffuser cover.

[0012] The described slag-water separation unit further includes a floating slag collection and fishing assembly and a slag scraping assembly. The floating slag collection and fishing assembly is a belt conveyor with a number of horizontal plates for fishing slag on an annular mesh belt. The floating slag collection and fishing assembly is inclined above the floating slag separation tank and the floating slag collection tank. The collection and fishing end of the floating slag collection and fishing assembly is submerged in the water liquid of the floating slag separation tank. The slag scraping assembly is a rotating member provided with a motor and a scraper. The scraper is arranged vertically, and the middle part thereof is connected to the output shaft of the motor. The slag scraping assembly is placed at the bottom of the floating slag separation tank. The lower side of its scraper contacts the bottom wall of the floating slag separation tank, and the scraper can scrape the sediment at the bottom of the floating slag separation tank into the sludge collection tank provided at the bottom of the floating slag separation tank when rotating.

[0013] The described slag-water separation unit further includes a pumping assembly. The pumping assembly is provided with a pipe and a water pump. The pumping assembly is communicated with the pressurizing unit, and its water suction end is placed in the clean water collection tank.

[0014] The flocculation unit is provided with a metering chemical dosing pump above the tank body for its flocculation reaction.

[0015] The air inlet of the described pressurizing unit can be connected to the external compressed air supply pipeline network.

[0016] As can be seen from the above description, the advantages of a treatment device for reusing aluminum-containing sewage provided by the present utility model are as follows: the slag-water separation unit is arranged downstream of the flocculation unit, and a pressurization unit is provided. The slag-water separation unit is provided with a clear water collection pool, a scum separation pool and a scum collection pool. The pressure water tank of the pressurization unit can obtain clear water from the clear water collection pool and access compressed air to be fully dissolved to form pressure water rich in compressed air. The water outlet of the pressurization unit and the water outlet of the flocculation unit are both communicated with the main water inlet pipe of the water inlet pipe assembly arranged in the cylinder body of the scum separation pool, so that the clear water dissolved with compressed air and the flocculated sewage can be sent into the cylinder body of the scum separation pool for decompression to generate a large number of bubbles, so that the aluminum-containing flocculated residues float up quickly and the floating scum is automatically fished by the floating scum fishing assembly, thereby shortening the operation time of sewage treatment and improving the treatment efficiency. The design of the present utility model is reasonable, the structure is simple, the cost is low, and it is convenient to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall schematic diagram of a treatment device for reusing aluminum-containing sewage according to the present utility model;

[0018] Figure 2 is the enlarged schematic diagram of the slag-water separation unit;

[0019] Figure 3 is the enlarged schematic diagram of the floating separation assembly;

[0020] Figure 4 is the enlarged schematic diagram of the water inlet pipe assembly;

[0021] Figure 5 is the enlarged schematic diagram of the diffusion hood;

[0022] Figure 6 is the enlarged schematic diagram of the floating scum fishing assembly;

[0023] Figure 7 is the enlarged schematic diagram of the slag scraping assembly.

[0024] REFERENCE MARKS:

[0025] 1 Pretreatment unit; 11 Sewage collection assembly; 12 Oil-water separation assembly; 13 Acid-base neutralization assembly; 14 Cooling assembly; 2 Flocculation unit; 3 Pressurization unit; 4 Slag-water separation unit; 41 Floating separation assembly; 411 Scum separation pool; 4111 Overflow hole; 412 Clear water collection pool; 413 Scum collection pool; 414 Water inlet pipe assembly; 4141 First water inlet pipe; 4142 Second water inlet pipe; 4143 Main water inlet pipe; 4144 Diffusion hood; 4145 Check valve; 415 Water outlet pipe; 42 Floating scum fishing assembly; 43 Slag scraping assembly; 431 Scraper; 44 Water pumping assembly. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following further describes the present utility model through specific embodiments.

[0027] As Figure 1 shown, a treatment device for reusing aluminum-containing sewage according to the present utility model includes a pretreatment unit 1, a flocculation unit 2, a pressurization unit 3, and a slag-water separation unit 4. The pretreatment unit 1 includes a sewage collection assembly 11, an oil-water separation assembly 12, an acid-base neutralization assembly 13, and a cooling assembly 14. The pretreatment unit 1 can perform oil-water separation, acid-base neutralization, and cooling on aluminum-containing sewage. Sewage collection, oil-water separation, acid-base neutralization, and water cooling and temperature reduction are all well-known technologies. The flocculation unit 2 is provided with a tank body with an inlet and an outlet for performing a flocculation reaction on sewage. Its inlet is connected to the pretreatment unit 1. The flocculation unit 2 is provided with a metering chemical dosing pump above the tank body of its flocculation reaction. The pressurization unit 3 is provided with a pressure water tank with an inlet, an air inlet, and an outlet for performing high-pressure mixing of compressed air and water liquid. The pressure water tank is a well-known technology. The air inlet of the pressurization unit 3 can be connected to an external compressed air supply pipeline network. The slag-water separation unit 4 is provided with three tank bodies that can respectively hold clear water, sewage, and floating slag. Inside the tank body for holding sewage in the middle, there is a vertically penetrating cylinder, and an L-shaped water inlet pipe is arranged in the cylinder. The inlet of the pressurization unit 3 is connected to the tank body for holding clear water of the slag-water separation unit 4. The outlet of the pressurization unit 3 and the outlet of the flocculation unit 2 are both connected to the water inlet pipe arranged by the slag-water separation unit 4. This water inlet pipe can send the clear water dissolved with compressed air and the flocculated sewage into the cylinder of the slag-water separation unit 4 for pressure reduction and make the aluminum-containing flocculated residue float. The slag-water separation unit 4 can separate the clear water and the floating slag and transfer them to the tank bodies for holding clear water and holding floating slag respectively.

[0028] As Figures 1 to 5As shown in the figure, the slag-water separation unit 4 of the present utility model includes a floating separation assembly 41, a floating slag collection and fishing assembly 42, a slag scraping assembly 43, and a water pumping assembly 44. The floating separation assembly 41 is provided with a floating slag separation tank 411, a clear water collection tank 412, a floating slag collection tank 413, a combined water inlet pipe 414, and a water outlet pipe 415. The clear water collection tank 412 and the floating slag collection tank 413 are respectively arranged on both sides of the floating slag separation tank 411. A plurality of overflow holes 4111 are provided at the upper part of the pool wall where the floating slag separation tank 411 is connected to the clear water collection tank 412. The overflow holes 4111 are small holes that allow the water liquid to flow through but prevent the floating slag from passing through. The floating slag separation tank 411 is a double-layer component composed of a tank body capable of containing sewage and a cylinder suspended and fixedly connected in the middle of the tank body. The upper and lower parts of the cylinder are open. The bottom wall of the tank body is flat, and a sludge collection tank recessed downward and a sewage discharge port with a valve are provided on the bottom wall. A sewage discharge port with a valve is provided on the bottom wall of the floating slag collection tank 413. The combined water inlet pipe 414 is in an L-shaped structure. The combined water inlet pipe 414 passes through and is fixedly connected to the tank wall of the floating slag separation tank 411. One end of its vertical part is inserted into the cylinder of the floating slag separation tank 411. The water outlet pipe 415 passes through and is fixedly connected to the lower part of the pool wall of the clear water collection tank 412. The combined water inlet pipe 414 includes a first water inlet pipe 4141, a second water inlet pipe 4142, a water inlet main pipe 4143, a diffusion hood 4144, and a one-way valve 4145. The water inlet main pipe 4143 is an L-shaped pipe including a horizontal pipe and a vertical pipe. One ends of the first water inlet pipe 4141 and the second water inlet pipe 4142 are both connected to the horizontal pipe end of the water inlet main pipe 4143. The diffusion hood 4144 is fixedly connected to the vertical pipe end of the water inlet main pipe 4143. There are two one-way valves 4145. The two one-way valves 4145 are respectively connected to the first water inlet pipe 4141 and the second water inlet pipe 4142 to limit the reverse flow of the water liquid in the first water inlet pipe 4141 and the second water inlet pipe 4142. The diffusion hood 4144 is a conical component surrounded by a bottom wall and a conical wall. A plurality of small holes are densely provided on its conical wall. The vertical pipe of the water inlet main pipe 4143 is fixedly connected to the bottom wall of the diffusion hood 4144 and is communicated with the diffusion hood 4144.

[0029] As Figures 1 to 7As shown in the figure, the scum collection and fishing component 42 of the present utility model is a belt conveyor with a number of horizontal plates for fishing scum provided on an annular belt. The scum collection and fishing component 42 is inclinedly placed above the scum separation tank 411 and the scum collection tank 413. The collection end of the scum collection and fishing component 42 is submerged in the water of the scum separation tank 411. The slag scraping component 43 is a rotating member provided with a motor and a scraper 431. The scraper 431 is arranged vertically and its middle part is connected to the output shaft of the motor. The slag scraping component 43 is placed at the bottom of the scum separation tank 411. The lower side of its scraper 431 contacts the bottom wall of the scum separation tank 411, and when the scraper 431 rotates, it can scrape the sediment at the bottom of the scum separation tank 411 into the sludge collection tank provided at the bottom of the scum separation tank 411. The water pumping component 44 is provided with a pipeline and a water pump. The water pumping component 44 is communicated with the pressurizing unit 3, and its water suction end is placed in the clean water collection tank 412.

[0030] The usage method of the treatment device for reusing aluminum-containing sewage according to the present utility model is as follows:

[0031] The sewage containing aluminum is centrally collected by the sewage collection component 11 of the pretreatment unit 1. When treatment is required, the sewage in the sewage collection component 11 is first pumped to the oil-water separation component 12 to separate the floating oil, and the floating oil is centrally collected. Then, the deoiled sewage is pumped to the acid-base neutralization component 13 to adjust the pH value so that the acid and alkali in the sewage are completely neutralized. If the temperature of the neutralized sewage exceeds 40°C, the cooling component 14 is started to cool it down to below 40°C and then sent to the flocculation unit 2; if the temperature of the neutralized sewage is below 40°C, the sewage does not need to be cooled when flowing through the cooling component 14 and is directly sent to the flocculation unit 2. Then, a flocculant is added to the sewage in the flocculation unit 2 for flocculation treatment, and the flocculated sewage is sent to the inlet main pipe 4143 in the floating slag separation tank 411 of the slag-water separation unit 4. An appropriate amount of clean water is injected into the clean water collection tank 412 in advance, and the pressurization unit 3 is started to send the clean water in the clean water collection tank 412 and external compressed air into the pressure water tank of the pressurization unit 3 to be fully dissolved to form pressure water rich in compressed air. Then, the pressure water is sent to the inlet main pipe 4143 in the floating slag separation tank 411 of the slag-water separation unit 4 to be fully mixed with the flocculated sewage; the mixed flocculated sewage and the clean water rich in compressed air are fully diffused into the cylinder body of the floating slag separation tank 411 through the diffusion hood 4144 of the water inlet pipe fitting 414. Since the compressed air is fully dissolved in the water liquid and is sent into the cylinder body with upper and lower open ends of the floating slag separation tank 411 to be depressurized to atmospheric pressure, a large number of tiny bubbles will be released from the compressed air dissolved in the water liquid and float upward to the water surface, and the flocculation residues in the water will adhere to the bubbles and float to the water surface together to form floating slag. The floating slag is transferred to the floating slag collection tank 413 by the floating slag collection and fishing component 42 and then centrally collected. The floating slag can be filter-pressed into solid matter and recycled. The clean water in the floating slag separation tank 411 overflows into the clean water collection tank 412 through the overflow holes 4111 for collection. The collected clean water can be reused, and the clean water used by the pressurization unit 3 can also be obtained from the clean water collection tank 412. If there is a small amount of sediment deposited at the bottom of the floating slag collection tank 413, it is scraped by the scraper 431 of the slag scraping component 43 into the sludge collection tank recessed at the bottom of the floating slag collection tank 413 and discharged through the sewage discharge valve for centralized collection.

[0032] The utility model improves the treatment device for aluminum-containing sewage. The slag-water separation unit 4 is arranged downstream of the flocculation unit 2, and a pressurizing unit 3 is provided. The slag-water separation unit 4 is provided with a clear water collection pool 412, a scum separation pool 411 and a scum collection pool 413. The pressure water tank of the pressurizing unit 3 can obtain clear water from the clear water collection pool 412 and access compressed air to be fully dissolved to form pressure water rich in compressed air. The water outlet of the pressurizing unit 3 and the water outlet of the flocculation unit 2 are both communicated with the main water inlet pipe 4143 of the water inlet pipe assembly 414 arranged in the cylinder body of the scum separation pool 411, so that the clear water dissolved with compressed air and the flocculated sewage can be sent into the cylinder body of the scum separation pool 411 for pressure reduction, so that the aluminum-containing flocculated residues can quickly float up and the floating scum can be automatically fished by the floating scum fishing assembly 42, thereby shortening the operation time of sewage treatment and improving the treatment efficiency.

[0033] The above is only a specific embodiment of the utility model, but the design concept of the utility model is not limited thereto. Any non-substantive modification of the utility model using this concept shall fall within the scope of infringement of the protection scope of the utility model.

Claims

1. A treatment device for recycling aluminum-containing wastewater, comprising a pre-treatment unit (1), wherein the pre-treatment unit (1) comprises a wastewater collection component (11), an oil-water separation component (12), an acid-base neutralization component (13) and a cooling component (14), and the pre-treatment unit (1) can perform oil-water separation, acid-base neutralization and cooling on the aluminum-containing wastewater, and is characterized in that: The device further comprises a flocculation unit (2), a pressurizing unit (3) and a slag-water separation unit (4). The flocculation unit (2) is provided with a tank body with a water inlet and a water outlet for carrying out a flocculation reaction on the sewage, and the water inlet is connected to the pre-treatment unit (1). The pressurizing unit (3) is provided with a pressure water tank with a water inlet, an air inlet and a water outlet for carrying out a high-pressure mixing of compressed air and water. The slag-water separation unit (4) is provided with three tank bodies for respectively containing clean water, sewage and scum, and a cylindrical body which is connected up and down is provided inside the tank body for containing sewage in the middle. An L-shaped water inlet pipe is provided in the cylinder, the water inlet of the pressurizing unit (3) is connected to the tank body of the slag-water separation unit (4) containing clean water, the water outlet of the pressurizing unit (3) and the water outlet of the flocculation unit (2) are both connected to the water inlet pipe provided in the slag-water separation unit (4), the water inlet pipe can send clean water and flocculated sewage dissolved with compressed air into the cylinder body of the slag-water separation unit (4) to reduce the pressure and make the aluminum-containing flocculated residue float, the slag-water separation unit (4) can separate the clean water from the scum and transfer them to the tank bodies containing clean water and the scum respectively.

2. The treatment device for recycling aluminum-containing wastewater according to claim 1, characterized in that: The slag-water separation unit (4) comprises a floatation assembly (41), wherein the floatation assembly (41) is provided with a slag separation pool (411), a clean water collection pool (412) and a slag collection pool (413), wherein the clean water collection pool (412) and the slag collection pool (413) are respectively arranged on both sides of the slag separation pool (411), and a plurality of flooding holes (4111) are arranged on the upper part of the pool wall connecting the slag separation pool (411) and the clean water collection pool (412).

3. The treatment device for recycling aluminum-containing wastewater according to claim 2, characterized in that: The scum separation tank (411) is a double-layer component composed of a trough body that can hold sewage and a cylinder body suspended and fixed in the middle of the trough body. The cylinder body is open at the top and bottom, and the bottom wall of the trough body is flat and is provided with a downwardly recessed sludge collection trough and a sewage outlet with a valve.

4. The treatment device for recycling aluminum-containing wastewater according to claim 3 is characterized in that: The slag-water separation unit (4) further comprises an inlet pipe assembly (414) and an outlet pipe (415); the inlet pipe assembly (414) is an L-shaped structure; the inlet pipe assembly (414) passes through and is fixedly connected to the tank wall of the slag separation tank (411); one end of the inlet pipe assembly (414) is inserted into the cylinder of the slag separation tank (411); and the outlet pipe (415) passes through and is fixedly connected to the lower part of the tank wall of the clean water collection tank (412).

5. The treatment device for recycling aluminum-containing wastewater according to claim 4, characterized in that: The water inlet pipe assembly (414) comprises a first water inlet pipe (4141), a second water inlet pipe (4142), a water inlet main pipe (4143), a diffusion cover (4144) and a one-way valve (4145). The water inlet main pipe (4143) is an L-shaped pipe including a transverse pipe and a vertical pipe. One end of the first water inlet pipe (4141) and the second water inlet pipe (4142) are both connected to the transverse pipe end of the water inlet main pipe (4143). The diffusion cover (4144) is fixedly connected to the vertical pipe end of the water inlet main pipe (4143). The one-way valve (4145) consists of two pieces, and the two one-way valves (4145) are respectively connected to the first water inlet pipe (4141) and the second water inlet pipe (4142).

6. The treatment device for recycling aluminum-containing wastewater according to claim 5, characterized in that: The diffusion cover (4144) is a conical component formed by a bottom wall and a conical wall, and a plurality of small holes are densely arranged on the conical wall. The vertical pipe of the water inlet main pipe (4143) is fixedly connected to the bottom wall of the diffusion cover (4144) and is connected to the diffusion cover (4144).

7. The device for recycling aluminum-containing wastewater according to claim 6, characterized in that: The slag-water separation unit (4) further comprises a slag collecting assembly (42) and a slag scraping assembly (43). The slag collecting assembly (42) is a mesh belt conveyor with a plurality of transverse plates on an annular mesh belt. The slag collecting assembly (42) is obliquely arranged above the slag separation pool (411) and the slag collection pool (413). The collecting end of the slag collecting assembly (42) is immersed in the water of the slag separation pool (411). The slag scraping assembly (43) ) is a rotating component provided with a motor and a scraper (431), the scraper (431) is arranged sideways and the middle part is connected to the output shaft of the motor, the scraper assembly (43) is placed at the bottom of the scum separation tank (411), the lower side of the scraper (431) is in contact with the bottom wall of the scum separation tank (411), and the scraper (431) can scrape the sediment at the bottom of the scum separation tank (411) into the sludge collection tank provided at the bottom of the scum separation tank (411) when rotating.

8. The device for recycling aluminum-containing wastewater according to claim 7, characterized in that: The slag-water separation unit (4) further comprises a pumping assembly (44), wherein the pumping assembly (44) is provided with a pipeline and a water pump, the pumping assembly (44) is connected to the pressurizing unit (3), and its water suction end is placed in the clean water collection tank (412).

9. The device for recycling aluminum-containing wastewater according to claim 8, characterized in that: The flocculation unit (2) is provided with a metering dosing pump above the flocculation reaction tank.

10. The treatment device for recycling aluminum-containing wastewater according to claim 9, characterized in that: The air inlet of the pressurizing unit (3) can be connected to an external compressed air supply network.

Images