Aluminum hot rolling emulsion treatment system and method based on deep denitrification biological filtration

Abstract

The present application relates to the technical field of emulsion treatment, and discloses an aluminum hot rolling waste emulsion treatment system and method based on deep denitrification biological filtration, which comprises a treatment box, and the treatment box is provided with a negative pressure suction pipe, a feeding pipe, an air inlet pipe, a discharging pipe and an oil discharge pipe; a rotating rod is rotatably arranged in the treatment box, the lower end of the rotating rod is provided with a plurality of elbow pipes, the air inlet pipe penetrates through the treatment box and is communicated with the elbow pipes through the rotating rod; a filter element is installed on the rotating rod; the treatment box is provided with a material scraping unit; the filter element filters the aluminum slag in the emulsion in the treatment box during the ascending process on the rotating rod, avoids the filter hole of the filter element from being blocked, and the nano bubbles discharged from the elbow pipes move upward from the emulsion; the liquid oil and water in the treatment box are separated by using the bubble technology, thereby realizing the layered treatment of the emulsion oil, water and slag in the treatment box, and effectively improving the treatment effect of the waste emulsion.

Description

Technical Field

[0001] This invention relates to the field of emulsion treatment technology, and more specifically to a system and method for treating aluminum hot rolling waste emulsion based on deep denitrification biofiltration. Background Technology

[0002] Emulsions are essential liquids used in the hot rolling mill during aluminum sheet and strip processing to lubricate the rolls and cool the sheet. Emulsions are typically formulated with water, base oil, and surfactants. To maintain the stability of the oil's appearance and achieve specific functions during use, various additives (such as rust inhibitors, extreme pressure additives, friction modifiers, and antioxidants) are often added. Emulsions usually need to be recycled. As lubricating oil, machine oil, and metal shavings are continuously mixed into the emulsion, its quality deteriorates, requiring periodic drainage and replenishment with fresh emulsion.

[0003] After repeated use, the emulsion will introduce fine chips and dust particles, which will reduce its performance. It is necessary to replace the emulsion regularly, which will generate a large amount of waste emulsion. The waste emulsion has a high oil content and contains a variety of toxic substances. It cannot be discharged directly and needs to be purified.

[0004] Patent CN 211170264 U discloses a waste emulsion pretreatment device, comprising a coarse sludge filtration tank connected to a waste emulsion storage tank, followed by a demulsification pipe, a primary flotation mechanism, and a secondary flotation mechanism connected sequentially after the coarse sludge filtration tank, with a fine sludge filtration mechanism located between the primary and secondary flotation mechanisms. Multiple ultrasonic devices are installed on the demulsification pipe. This device performs preliminary coarse sludge filtration on the emulsion, and then utilizes the sequentially arranged demulsification pipe, primary flotation mechanism, fine sludge filtration mechanism, and secondary flotation mechanism to fully separate oil and water, efficiently and smoothly completing the pretreatment process of the emulsion. This ensures thorough dehydration of the floating oil and sludge in the emulsion, facilitating further processing of the emulsion. However, a common method for treating floating oil and slag in waste emulsions during pretreatment is to use a suction pump for direct adsorption and removal. However, this method removes both oil and slag simultaneously, and also draws in some water. Subsequent separation of the slag and oil is then necessary, which is time-consuming and labor-intensive. Therefore, this paper proposes a deep denitrification biofiltration-based system and method for treating aluminum hot-rolled waste emulsion to address these problems. Summary of the Invention

[0005] This invention provides a system and method for treating aluminum hot rolling waste emulsion based on deep denitrification biofiltration, aiming to solve the technical problem that the method of using a suction pump and suction pipe in related technologies directly removes oil and slag at the same time, and the slag and oil need to be separated later, which is time-consuming and labor-intensive.

[0006] The present invention relates to a treatment system for hot-rolled aluminum emulsion based on deep denitrification biofiltration, comprising a treatment tank, wherein the treatment tank has a negative pressure suction pipe, a feed pipe, an air inlet pipe, a discharge pipe and an oil drain pipe;

[0007] The processing box is equipped with a rotating rod inside, and the lower end of the rotating rod is provided with multiple bends arranged in a ring array. The air inlet pipe passes through the processing box and is connected to the bends through the rotating rod. The gas in the air inlet pipe passes through the bends and drives the rotating rod to rotate.

[0008] A filter element is installed on the rotating rod, and the filter element moves up and down inside the processing box by rotating with the rotating rod.

[0009] The upper interior of the processing box is equipped with a scraping unit for processing the slag on the filter element;

[0010] The lower side of the oil drain pipe is connected to the processing tank by a return pipe. An oil-water separation membrane is provided between the return pipe and the oil drain pipe. A liquid storage hopper is provided on the lower side of the oil drain pipe. The oil-water separation membrane is located on the liquid storage hopper. A drain pipe is provided on the outside of the liquid storage hopper.

[0011] The oil drain pipe has a discharge port near the treatment tank. Inside the discharge port is a switching assembly, which includes a baffle at the discharge port. Below the baffle and between it and the treatment tank is a second elastic element that continuously drives the baffle upwards to block the discharge port. A guide plate is slidably mounted on the inner side of the baffle, with an inclined surface on its inner side. During the upward movement of the filter element, it contacts the guide plate, causing the guide plate to retract inwards towards the baffle to prevent the filter element from obstructing its upward movement. The discharge port has an installation groove, and the baffle is located within the installation groove. A sealing gasket is between the baffle and the installation groove to prevent liquid leakage from inside the treatment tank. The baffle has a receiving groove, and the guide plate is located within the receiving groove. A third elastic element is between the guide plate and the receiving groove.

[0012] Preferably, the feed pipe is positioned higher than the discharge pipe, the air inlet pipe is located at the bottom center of the processing box, and the oil discharge pipe is positioned lower than the feed pipe but higher than the discharge pipe.

[0013] Preferably, the filter element includes a rotating sleeve, a first fixing ring is rotatably provided on the outer side of the rotating sleeve, a filter screen is connected to the outer side of the first fixing ring, a second fixing ring is circumferentially connected to the filter screen, and a support rib plate located below the filter screen is connected between the first fixing ring and the second fixing ring.

[0014] Preferably, the rotating rod has a reciprocating threaded groove, the rotating sleeve is fitted onto the rotating rod, and the inner wall of the rotating sleeve has a first protrusion that cooperates with the reciprocating threaded groove.

[0015] Preferably, the inner top wall of the processing box is provided with a guide rod arranged along the length of the processing box, and the rotating sleeve is provided with a circular hole corresponding to the guide rod.

[0016] Preferably, the rotating rod has a cavity inside, which is divided into a first chamber and a second chamber. The second chamber is located above the first chamber. The first chamber is connected to the bend pipe. The second chamber is arranged along the length of the rotating rod. The diameter of the first chamber is larger than the diameter of the second chamber. An air guide pipe is provided between the second chamber and the reciprocating threaded groove.

[0017] Preferably, the inner wall of the processing box is provided with a spiral groove, and the outer side of the second fixing ring has a second protrusion located in the spiral groove.

[0018] The treatment method for aluminum hot rolling waste emulsion based on deep denitrification biofiltration includes the following steps:

[0019] Step A: Add emulsion to the processing tank. The emulsion enters the processing tank through the feed pipe. When the emulsion level is at the preset height of the processing tank, the gas discharged through the air inlet pipe drives the rotating rod to rotate.

[0020] Step B: The rotating rod drives the filter element to rise. During the rising process, the filter element is threadedly engaged with the inner wall of the treatment chamber, causing the filter element to rotate.

[0021] Step C: During the upward process, the filter element filters the residue in the emulsion. At the same time, the air bubbles discharged through the inlet pipe enter the treatment chamber and move upwards, using bubble oil-water separation technology to separate water and oil into layers.

[0022] Step D: After the filter element comes into contact with the scraping unit, the filter element rotates and passes through the scraping unit to scrape off the slag on the filter element, and then the slag is sucked off through the negative pressure suction pipe;

[0023] Step F: After the filter element moves to the top of the rotating rod, it begins to descend. When the filter element descends below the oil drain pipe, the oil drain pipe is in the open state, allowing the oil to overflow from the oil drain pipe. Beneficial effects

[0024] 1. As the filter element rises through the rotating rod, it filters the aluminum slag in the emulsion within the treatment tank. During descent, the liquid inside the treatment tank flushes the filter element, ensuring its filtration efficiency and preventing clogging of the filter pores. Simultaneously, nano-bubbles discharged from the curved tube move upwards from the emulsion, using bubble technology to achieve oil-water separation within the treatment tank. This stratification of oil, water, and slag in the emulsion effectively improves the treatment efficiency of waste emulsion.

[0025] 2. The switch assembly is designed to open the outlet during the descent of the filter element, preventing the emulsion from flowing directly out of the oil drain pipe after the emulsion level exceeds the outlet. The return pipe is designed to pour water into the treatment tank when it exceeds the outlet, preventing water from being discharged from the oil drain pipe and mixing with the oil again. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the processing system of the present invention.

[0027] Figure 2 This is a cross-sectional internal structure diagram of the processing box of the present invention.

[0028] Figure 3 This is a schematic diagram of the oil drain pipe of the present invention.

[0029] Figure 4 This is a schematic diagram of the rotating rod of the present invention.

[0030] Figure 5 This is a cross-sectional structural diagram of the rotating rod of the present invention.

[0031] Figure 6 This is a first-view structural schematic diagram of the filter element of the present invention.

[0032] Figure 7 This is a second-view structural schematic diagram of the filter element of the present invention.

[0033] Figure 8 This is a schematic diagram of the structure of the baffle of the present invention.

[0034] Figure 9 This is a schematic diagram of the scraping unit of the present invention.

[0035] Figure 10 This is a cross-sectional structural diagram of the baffle plate of this invention.

[0036] Figure label:

[0037] 100. Processing box; 110. Negative pressure suction pipe; 120. Feed pipe; 130. Air inlet pipe; 140. Discharge pipe; 150. Oil drain pipe; 160. Return pipe; 200. Rotating rod; 210. Bend; 220. First chamber; 230. Second chamber; 240. Air guide pipe; 250. Reciprocating threaded groove; 260. Guide rod; 101. Spiral groove; 300. Scraping unit; 310. Fixing sleeve; 320. Scraper; 330. First elastic element; 400. Filter Components; 410, Rotating sleeve; 411, First protrusion; 420, First fixing ring; 430, Filter screen; 440, Second fixing ring; 441, Second protrusion; 450, Support rib; 111, Discharge port; 112, Mounting groove; 113, Baffle; 114, Guide plate; 115, Second elastic element; 116, Return port; 117, Partition; 161, Oil-water separation membrane; 131, Receiving tank; 132, Third elastic element; 151, Liquid storage hopper; 152, Drainage pipe. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, with examples of the embodiments illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] like Figures 1 to 10 As shown, the aluminum hot rolling waste emulsion treatment system based on deep denitrification biofiltration provided by the present invention includes a circular treatment box 100, which is vertically arranged. The treatment box 100 has a negative pressure suction pipe 110, a feed pipe 120, an air inlet pipe 130, a discharge pipe 140, and an oil discharge pipe 150. The feed pipe 120 is located at the upper part of the treatment box 100, the discharge pipe 140 is located at the lower part of the treatment box 100, the air inlet pipe 130 is located at the middle of the bottom end of the treatment box 100, the oil discharge pipe 150 is located below the position of the feed pipe 120 and above the position of the discharge pipe 140, and the negative pressure suction pipe 110 is located to the side of the feed pipe 120 to prevent the liquid sprayed from the feed pipe 120 from directly entering the negative pressure suction pipe 110.

[0040] like Figure 2 As shown, a rotating rod 200 is rotatably installed inside the processing box 100. The rotating rod 200 is arranged along the axial direction of the processing box 100. Specifically, the rotating rod 200 is connected to the upper and lower end faces of the processing box 100 through sealed bearings. The lower end of the rotating rod 200 is provided with multiple bends 210 arranged in an annular array. The bends 210 are arc-shaped. The air inlet pipe 130 passes through the processing box 100 and is connected to the bends 210 through the rotating rod 200. The gas entering the processing box 100 through the air inlet pipe 130 is discharged from the bends 210. The air inlet pipe 210 drives the rotating rod 200 to rotate under the action of gas pressure.

[0041] A filter element 400 is installed on the rotating rod 200. The filter element 400 is located above the bend 210. The rotating rod 200 above the bend 210 is provided with a reciprocating threaded groove 250 in the circumferential direction. The filter element 400 is threadedly engaged with the rotating rod 200. During the rotation of the rotating rod 200, the filter element 400 is driven to move up and down reciprocally through the thread.

[0042] The top of the inner cavity of the processing box 100 has a scraping unit 300 for processing the slag on the filter element 400. The scraping unit 300 is correspondingly arranged with the negative pressure suction pipe 110 to remove the slag cleaned by the scraping unit 300 through the negative pressure suction pipe 110. In detail, the scraping unit 300 includes a fixing sleeve 310 and a scraper 320. The fixing sleeve 310 is fixed to the inner top wall of the processing box 100. The scraper 320 is installed inside the fixing sleeve 310. The scraper 320 has an inclined surface below it. The inclined surface below the scraper 320 cooperates with the upper surface of the filter element 400. There is a first elastic element 330 between the scraper 320 and the fixing sleeve 310. The first elastic element 330 can be an elastic structure such as a spring or a rubber column. The setting of the first elastic element 330 can avoid the situation where the contact time between the scraper 320 and the upper surface of the filter element 400 is too short due to the rise and fall of the filter element 400, resulting in poor cleaning effect of the slag on the filter element 400.

[0043] In the above scheme, the filter element 400 rises under the action of the reciprocating threaded groove 250 on the rotating rod 200. The rise of the filter element 400 filters the aluminum slag in the emulsion in the treatment tank 100, realizing the separation between solid and liquid. When the filter element 400 descends, the liquid inside the treatment tank 100 flushes the filter element 400 to ensure the filtration effect of the filter element 400 and avoid the clogging of the filter pores of the filter element 400. At the same time, the nanobubbles discharged from the bent pipe 210 move upward from the emulsion, and the bubble technology is used to separate the oil and water in the liquid in the treatment tank 100. This enables the stratified treatment of oil, water and slag in the emulsion in the treatment tank 100, effectively improving the treatment effect of waste emulsion.

[0044] Nanobubbles possess low viscosity and surface tension. When nanobubbles come into contact with oil droplets in water, a stable "three-phase interface" is formed due to surface tension, causing the oil droplets to be adsorbed onto the bubble surface. At this point, under applied pressure, the micro- and nanobubbles rapidly expand and aggregate to form larger bubbles, carrying the oil droplets adsorbed on their surfaces out of the water.

[0045] like Figure 3 and Figure 8As shown, a return pipe 160 is connected between the lower side of the oil drain pipe 150 and the treatment tank 100. An oil-water separation membrane 161 is provided between the return pipe 160 and the oil drain pipe 150. The oil-water separation membrane 161 allows water in the oil drain pipe 150 to pass through the oil-water separation membrane 161 and enter the return pipe 160. The oil-water separation membrane 161 is made of membrane materials such as TFC membrane and PES membrane. When the liquid level in the treatment tank 100 is higher than the discharge port 111, the liquid higher than the discharge port 111 flows out of the oil drain pipe 150 and undergoes secondary oil-water separation through the oil-water separation membrane 161, preventing the liquid from flowing out of the oil drain pipe 150 and mixing with the oil again. In detail, a liquid storage hopper 151 is provided on the lower side of the oil drain pipe 150, and an oil-water separation membrane 161 is located on the liquid storage hopper 151. A drain pipe 152 is provided on the outside of the liquid storage hopper 151. The liquid storage hopper 151 can increase the capacity of the return pipe 160, preventing liquid from overflowing directly from the drain pipe 152 due to insufficient space in the return pipe 160. A return port 116 is provided on the treatment tank 100. A baffle 117 is hinged inside the return port 116. The baffle 117 can act as a one-way valve, preventing liquid inside the treatment tank 100 from flowing into the return pipe 160, thus preventing the water and oil in the oil drain pipe 150 from being unable to separate. The return port 116 is located below the discharge port 111.

[0046] In the above scheme, after the filter element 400 descends, it contacts the guide plate 114, causing the baffle 113 to descend, thereby allowing the liquid to enter the storage tank 151 on the oil drain pipe 150 from the discharge port 111. The liquid passes through the oil-water separation membrane 161 and enters the return pipe 160, realizing the separation of oil and water in the emulsion. At this time, the baffle 117 keeps the return port 116 closed under the pressure of the liquid inside the treatment tank 100. When the liquid level in the treatment tank 100 is lower than the return port 116, the baffle 117 opens the return port 116 under the pressure of the liquid in the return pipe 160, and the liquid in the return pipe 160 and the storage tank 151 re-enters the treatment tank 100.

[0047] The oil drain pipe 150 has a discharge port 111 between its end near the treatment box 100 and the treatment box 100. The discharge port 111 has a switch assembly inside. The switch assembly includes a baffle 113 set at the discharge port 111. A second elastic element 115 is set between the baffle 113 and the treatment box 100. The second elastic element 115 can be an elastic structure such as a spring or a rubber column. The second elastic element 115 always drives the baffle 113 to move upward to block the discharge port 111. A guide plate 114 is slidably provided on the inner side of the baffle 113. The inner side of the guide plate 114 has an inclined surface. When the filter element 400 rises, it will contact the guide plate 114, causing the guide plate 114 to retract toward the baffle 113 to avoid the filter element 400 from blocking its upward movement. In detail, the discharge port 111 has an installation groove 112, the baffle 113 is located in the installation groove 112, and there is a sealing gasket between the baffle 113 and the installation groove 112 to prevent the liquid inside the treatment box 100 from leaking out. The baffle 113 has a receiving groove 131, the guide plate 114 is located in the receiving groove 131, and there is a third elastic element 132 between the guide plate 114 and the receiving groove 131. The third elastic element 132 can be an elastic structure such as a spring or a rubber column.

[0048] During use, the above solution can prevent the emulsion from flowing directly out of the oil drain pipe 150 after the emulsion level exceeds the discharge port 111; the return pipe 160 can guide the liquid after oil-water separation in the oil drain pipe 150 into the treatment tank 100, preventing the emulsion in the treatment tank 100 from flowing out of the oil drain pipe 150 and mixing with the oil again.

[0049] During the upward movement of the filter element 400, the edge of the filter element 400 will contact the inclined surface of the guide plate 114. The inclined surface of the guide plate 114 will cause the filter element 400 to press the guide plate 114 and move towards the baffle 113, so that the filter element 400 passes through the guide plate 114 and continues to move upward towards the processing box 100. During the downward movement, the filter element 400 will contact the upper plane of the guide plate 114 again, so that the filter element 400 will drive the baffle 113 to move downward through the guide plate 114, thereby opening the discharge port 111, so that the oil inside the processing box 100 flows into the oil drain pipe 150 from the discharge port 111.

[0050] like Figures 4 to 7As shown, the filter element 400 includes a rotating sleeve 410, with a first fixing ring 420 rotatably mounted on the outer side of the rotating sleeve 410. Specifically, the rotating sleeve 410 and the first fixing ring 420 are connected by a sealed bearing. A filter screen 430 is connected to the outer side of the first fixing ring 420. Specifically, the upper surface of the filter screen 430 is inclined, which allows the slag to gather towards the edge of the filter screen 430, facilitating slag collection. A second fixing ring 440 is circumferentially connected to the filter screen 430, and a support rib 450 located below the filter screen 430 is fixedly connected between the first fixing ring 420 and the second fixing ring 440. During the rotation of the filter screen 430, the supporting rib plate 450 rotates synchronously with the filter screen 430, generating a stirring effect, causing the slag to concentrate towards the inner wall of the processing box 100; the inner top wall of the processing box 100 is provided with a guide rod 260 arranged along the length of the processing box 100, and the rotating sleeve 410 is provided with a circular hole corresponding to the guide rod 260. The guide rod 260 limits the position of the rotating sleeve 410, so that the rotating sleeve 410 moves up and down along the rotating rod 200 through the reciprocating threaded groove 250.

[0051] The rotating rod 200 has a reciprocating threaded groove 250, and the rotating sleeve 410 is sleeved on the rotating rod 200 and works in conjunction with the reciprocating threaded groove 250. Specifically, the inner wall of the rotating sleeve 410 has a first protrusion 411 that works in conjunction with the reciprocating threaded groove 250. The rotating rod 200 has an internal cavity, which is divided into a first chamber 220 and a second chamber 230. The second chamber 230 is located above the first chamber 220. The first chamber 220 is connected to the bend 210. The second chamber 230 is arranged along the length of the rotating rod 200. There is a gas guide pipe 240 between the second chamber 230 and the reciprocating threaded groove 250. The diameter of the first chamber 220 is larger than the diameter of the second chamber 230, which ensures that the gas is preferentially discharged from the bend 210 of the first chamber 220. The diameter of the gas guide pipe 240 is smaller than the width of the reciprocating threaded groove 250, which can reduce the amount of gas flowing towards the reciprocating threaded groove 250 and compress the air pressure, increasing the pressure of the air ejected from the gas guide pipe 240. This achieves the cleaning of the slag retained inside the reciprocating threaded groove 250 and prevents the slag from remaining in the reciprocating threaded groove 250 and causing the filter element 400 to be obstructed from moving up and down.

[0052] like Figure 3 , Figure 6 and Figure 7As shown, a spiral groove 101 is provided on the inner wall of the processing box 100. The discharge port 111 and the return port 116 are both located within the pitch of the spiral groove 101, that is, between the upper and lower spiral grooves 101, so as to avoid affecting the cooperation between the second protrusion 441 and the spiral groove 101. The outer side of the second fixing ring 440 has a second protrusion 441 located in the spiral groove 101. The cooperation between the second protrusion 441 and the spiral groove 101 can limit the filter element 400 while allowing the filter element 400 to rotate, so that the slag on the filter element 400 can be scraped into the negative pressure suction pipe 110 by the scraper 320. The negative pressure suction pipe 110 can be used again to better adsorb and process the slag.

[0053] A method for treating aluminum hot-rolled waste emulsion based on deep denitrification biofiltration includes the following steps:

[0054] Step A: Add emulsion to the processing tank 100. The emulsion enters the processing tank 100 through the feed pipe 120. In order to prevent the liquid from entering the first chamber 220 through the air guide pipe 240, the liquid in the processing tank 100 will submerge the bend pipe 210, and the gas in the air inlet pipe 130 will enter the second chamber 230 in advance. The gas will be continuously discharged to block the air guide pipe 240. At this time, the gas pressure is small and the rotating rod 200 will not rotate. When the liquid level of the emulsion is at the preset height of the processing tank 100, the gas pressure entering through the air inlet pipe 130 will increase and be discharged through the bend pipe 210, driving the rotating rod 200 to rotate.

[0055] Step B: The rotating rod 200 drives the filter element 400 to rise under the cooperation of the first protrusion 411 and the reciprocating thread groove 250 on the rotating sleeve 410. During the rise of the filter element 400, the filter element 400 rotates on its own during the rise due to the cooperation between the second protrusion 441 and the spiral groove 101.

[0056] Step C: During the upward process, the filter element 400 can filter the slag in the emulsion. At the same time, the air bubbles discharged by the bend pipe 210 through the air inlet pipe 130 enter the processing box 100 through the bend pipe 210 and move upward towards the processing box 100. The water and oil are separated by the bubble oil-water separation technology.

[0057] Step D: The filter element 400 continues to rise and detaches from the surface of the emulsion, separating the slag in the emulsion, thereby achieving stratification between slag, oil, and water in the emulsion. During its rise, the filter element 400 contacts the guide plate 114. Since the guide plate 114 has an inclined surface, the filter element 400 will squeeze the guide plate 114 to contract. After the filter element 400 passes the guide plate 114, the guide plate 114 returns to its original position under the action of the second elastic element 115. When the filter element 400 rises and contacts the scraping unit 300, the filter element 400 continues to rotate and the scraping unit 300 scrapes off the slag on the filter element 400. The slag is then sucked off through the negative pressure suction pipe 110. After the scraper 320 contacts the filter screen 430, the filter screen 430 continues to rise and squeezes the scraper 320 into the fixed sleeve 310, causing the first elastic element 330 to be compressed to ensure that the scraper 320 is always in contact with the upper surface of the filter screen 430.

[0058] Step F: After the filter element 400 moves to the top of the rotating rod 200, it begins to descend again through the reciprocating threaded groove 250. The filter element 400 contacts the guide plate 114 and drives the baffle 113 to move, so that the baffle 113 opens the outlet 111, allowing the oil to overflow from the oil drain pipe 150. When the baffle 113 descends, the guide plate 114 is squeezed and contracted by the mounting groove 112, releasing the connection between the guide plate 114 and the filter element 400. At this time, the filter element 400 continues to descend, using the liquid inside the filter element 400 to backwash the filter element 400. The filter element 400 moves to the initial position of the rotating rod 200, and the filtered liquid will be discharged from the outlet pipe 140 and circulate again.

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A waste emulsion treatment system for hot-rolled aluminum alloys based on deep denitrification biofiltration, comprising a treatment tank, characterized in that, The processing box is equipped with a negative pressure suction pipe, a feed pipe, an air inlet pipe, a discharge pipe, and an oil drain pipe; The processing box is equipped with a rotating rod inside, and the lower end of the rotating rod is provided with multiple bends arranged in a ring array. The air inlet pipe passes through the processing box and is connected to the bends through the rotating rod. The gas in the air inlet pipe passes through the bends and drives the rotating rod to rotate. A filter element is installed on the rotating rod, and the filter element moves up and down inside the processing box by rotating with the rotating rod. The upper interior of the processing box is equipped with a scraping unit for processing the slag on the filter element; The lower side of the oil drain pipe is connected to the processing tank by a return pipe. An oil-water separation membrane is provided between the return pipe and the oil drain pipe. A liquid storage hopper is provided on the lower side of the oil drain pipe. The oil-water separation membrane is located on the liquid storage hopper. A drain pipe is provided on the outside of the liquid storage hopper. The oil drain pipe has a discharge port near the treatment tank. Inside the discharge port is a switching assembly, which includes a baffle at the discharge port. Below the baffle and between it and the treatment tank is a second elastic element that continuously drives the baffle upwards to block the discharge port. A guide plate is slidably mounted on the inner side of the baffle, with an inclined surface on its inner side. During the upward movement of the filter element, it contacts the guide plate, causing the guide plate to retract inwards towards the baffle to prevent the filter element from obstructing its upward movement. The discharge port has an installation groove, and the baffle is located within the installation groove. A sealing gasket is between the baffle and the installation groove to prevent liquid leakage from inside the treatment tank. The baffle has a receiving groove, and the guide plate is located within the receiving groove. A third elastic element is between the guide plate and the receiving groove.

2. The aluminum hot rolling waste emulsion treatment system based on deep denitrification biofiltration according to claim 1, characterized in that, The feed pipe is positioned higher than the discharge pipe, the air inlet pipe is located in the middle of the bottom of the processing box, and the oil drain pipe is positioned lower than the feed pipe but higher than the discharge pipe.

3. The aluminum hot rolling waste emulsion treatment system based on deep denitrification biofiltration according to claim 1, characterized in that, The filter element includes a rotating sleeve, a first fixing ring is rotatably provided on the outer side of the rotating sleeve, a filter screen is connected to the outer side of the first fixing ring, a second fixing ring is circumferentially connected to the filter screen, and a support rib plate located below the filter screen is connected between the first fixing ring and the second fixing ring.

4. The aluminum hot rolling waste emulsion treatment system based on deep denitrification biofiltration according to claim 3, characterized in that, The rotating rod has a reciprocating threaded groove, the rotating sleeve is fitted onto the rotating rod, and the inner wall of the rotating sleeve has a first protrusion that cooperates with the reciprocating threaded groove.

5. The aluminum hot rolling waste emulsion treatment system based on deep denitrification biofiltration according to claim 3, characterized in that, The inner top wall of the processing box is provided with a guide rod arranged along the length of the processing box, and the rotating sleeve is provided with a circular hole corresponding to the guide rod.

6. The aluminum hot rolling waste emulsion treatment system based on deep denitrification biofiltration according to claim 4, characterized in that, The rotating rod has a cavity inside, which is divided into a first chamber and a second chamber. The second chamber is located above the first chamber. The first chamber is connected to the bend pipe. The second chamber is arranged along the length of the rotating rod. The diameter of the first chamber is larger than the diameter of the second chamber. There is an air guide pipe between the second chamber and the reciprocating threaded groove.

7. The aluminum hot rolling waste emulsion treatment system based on deep denitrification biofiltration according to claim 3, characterized in that, The inner wall of the processing box is provided with a spiral groove, and the outer side of the second fixing ring has a second protrusion located in the spiral groove.

8. A treatment method using the aluminum hot-rolling waste emulsion treatment system based on deep denitrification biofiltration as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step A: Add emulsion to the processing tank. The emulsion enters the processing tank through the feed pipe. When the emulsion level is at the preset height of the processing tank, the gas discharged through the air inlet pipe drives the rotating rod to rotate. Step B: The rotating rod drives the filter element to rise. During the rising process, the filter element is threadedly engaged with the inner wall of the treatment chamber, causing the filter element to rotate. Step C: During the upward process, the filter element filters the residue in the emulsion. At the same time, the air bubbles discharged through the inlet pipe enter the treatment chamber and move upwards, using bubble oil-water separation technology to separate water and oil into layers. Step D: After the filter element comes into contact with the scraping unit, the filter element rotates and passes through the scraping unit to scrape off the slag on the filter element, and then the slag is sucked off through the negative pressure suction pipe; Step F: After the filter element moves to the top of the rotating rod, it begins to descend. When the filter element descends below the oil drain pipe, the oil drain pipe is in the open state, allowing the oil to overflow from the oil drain pipe.

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