An electroplating wastewater recovery and treatment device

Abstract

The present invention relates to the technical field of electroplating wastewater treatment, and specifically relates to an electroplating wastewater recycling and treatment device, including a reaction tank. A sedimentation tank for flocculation and precipitation is arranged at the discharge end of the reaction tank. A fixing plate is welded at the middle position inside the sedimentation tank, and a hopper for storing flocculated precipitates is welded at the bottom of the sedimentation tank; A pressing plate structure that can adjust the height and the internal opening is adopted, which can realize the pre-dehydration treatment of the precipitates during the discharge of the precipitates in the sedimentation tank, reduce the time-consuming of the subsequent dehydration process, reduce the water content inside the precipitates, and at the same time use flocculants at both ends to treat the chromium-containing electroplating wastewater. The high-concentration chromium can be converted into Cr(OH)3 through flocculation and precipitation, and can be converted into Cr2O3 through high-temperature decomposition. The Cr2O3 is compounded into a polishing paste and used for polishing machine parts, and its polishing effect is better. The chromium in the electroplating wastewater is fully recycled, reducing environmental pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of electroplating wastewater treatment production, and particularly relates to an electroplating wastewater recovery and treatment device. Background Art

[0002] Electroplating wastewater treatment refers to the treatment of wastewater or waste liquid discharged during the electroplating production process. The wastewater and waste liquid discharged from electroplating factories contain a large amount of metal ions such as chromium, cadmium, and nickel, contain cyanide, acid, and alkali, and generally often contain organic additives. Some metal ions exist in the form of simple cations, some exist in the form of acid radical anions, and some exist in the form of complex complex ions. Since the content of harmful substances in electroplating wastewater is relatively high, electroplating production enterprises generally are equipped with electroplating wastewater treatment equipment to treat the discharged electroplating wastewater so that it meets the discharge standards. Commonly used methods for electroplating wastewater treatment include neutralization precipitation method, neutralization coagulation precipitation method, oxidation method, reduction method, barium salt method, ferrite method, etc.

[0003] At present, during the treatment of chromium-containing wastewater by existing electroplating wastewater treatment equipment, the main methods for treating chromium-containing wastewater at home and abroad include ferrite treatment method, sulfite reduction method, adsorption method, ion exchange method, electrolytic treatment method, electrodialysis, etc. In terms of reuse, during the commonly used centralized treatment of chromium-containing wastewater, flocculants are mostly required for precipitation reaction treatment. In the existing precipitation equipment, during the process of discharging the precipitate, since there is a lot of supernatant in the pool body, it is very easy to cause the synchronous discharge of the supernatant during the discharge of the precipitate, resulting in a large water content in the recovered precipitate. During subsequent treatment, a dehydration process must be added, increasing the treatment time. At the same time, during the flocculation precipitation reaction process, the added flocculants are generally mixed by external stirring equipment, resulting in a relatively high overall energy consumption of the equipment. Therefore, an electroplating wastewater recovery and treatment device is proposed, which can reduce the water content in the precipitate during the process of discharging the precipitate and then reduce the time-consuming of the subsequent dehydration process. At the same time, it can reduce the work of external mixing equipment during the flocculation precipitation process and reduce the energy consumption in the treatment process. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides an electroplating wastewater recovery and treatment device, which can reduce the water content in the precipitate during the process of discharging the precipitate and then reduce the time-consuming of the subsequent dehydration process. At the same time, it can reduce the work of external mixing equipment during the flocculation precipitation process and reduce the energy consumption in the treatment process.

[0005] The technical solution adopted by the present invention to solve its technical problems is an electroplating wastewater recovery and treatment device, including a reaction tank. A sedimentation tank for flocculation precipitation is arranged at the discharge end of the reaction tank. A fixing plate is welded at the middle position inside the sedimentation tank, and a hopper for storing flocculated precipitate is welded at the bottom of the sedimentation tank.

[0006] The top of the sedimentation tank is movably connected with a top plate, and a hydraulic cylinder B is installed on the top of the top plate. The power output end of the hydraulic cylinder B is installed with a pressing plate located at the bottom of the top plate and inserted into the sedimentation tank. A through groove is formed in the pressing plate, and filter plates are installed at one end of the through groove. A slot is formed on one side of the pressing plate close to the through groove, and a partition plate located on the top of the filter plate is inserted into the slot. A sleeve is installed at the bottom of the top plate, and a control rod inserted into the sleeve is fixedly connected to the top of the partition plate.

[0007] By adopting the above technical solution, the control rod structure can move horizontally under the action of an external power equipment component to adjust the position of the partition plate. During the normal flocculation sedimentation treatment process, the pressing plate is at a position close to the liquid level. At this time, the main body of the partition plate is inserted into the slot, and the through groove is in a fully open state. After the flocculation sedimentation treatment is completed, the hydraulic cylinder C operates to move the partition plate towards the filter plate until the partition plate is close to the top of the filter plate. At this time, the hydraulic cylinder B operates to drive the pressing plate to move downward. At the same time, during the downward movement, the supernatant will penetrate through the filter plate and seep into the top of the pressing plate, and the flocculants will be pressed by the pressing plate into the hopper. As the pressing plate continues to move downward, the flocculants can be squeezed and dehydrated to reduce the water content in the sediment. Before the sediment is discharged, the partition plate continues to move until it completely covers the filter plate and blocks the through groove, thereby isolating the sediment from the supernatant and preventing the supernatant from being mixed in during the external discharge of the sediment.

[0008] Specifically, a confluence pipe is embedded in the top plate, and the discharge end of the reaction tank is installed with a waste water inlet pipe communicated with the confluence pipe through a pump body. An auxiliary agent inlet pipe is installed on one side of the surface of the waste water inlet pipe, and an electromagnetic three-way valve A is arranged at the connection between the auxiliary agent inlet pipe and the waste water inlet pipe. A flocculant inlet pipe communicated with the sediment agent supply equipment is installed on one side of the top of the top plate, and the discharge end of the flocculant inlet pipe is communicated with the confluence pipe. A rotating shaft is installed in the confluence pipe, and stirring blades are fixedly connected to the outer circumference of the rotating shaft. A volute is installed vertically at one end of the top plate, and a turbine is installed in the volute. A transmission sleeve extending to the bottom of the top plate is installed at the central position of the turbine.

[0009] By adopting the above technical solution, the wastewater after preliminary reaction inside the reaction tank is input into the confluence pipe by the wastewater inlet pipe under the action of the pump body. During the input process, the initial precipitant sodium hydroxide is discharged from the flocculant inlet pipe. Inside the confluence pipe, preliminary mixing is achieved through the confluence and circulation of the water body. At the same time, during the mixing process, the water flow impact force will drive the rotation of the rotating shaft and the stirring blades. Inside the confluence pipe, after the sodium hydroxide is fully mixed with the wastewater, it is then discharged into the sedimentation tank through the discharge pipe for flocculation reaction. In the later stage of the flocculation reaction, the auxiliary agent is discharged from the auxiliary agent inlet pipe and the composite flocculant is discharged from the flocculant inlet pipe. Through the adjustment of the electromagnetic three-way valve B, the water flow enters the volute interior and uses the water flow impact to rotate the turbine. Under the water flow impact, the turbine rotates and drives the rotation of the transmission sleeve and the transmission shaft, so that the wastewater and the flocculant discharged into the sedimentation tank can be further fully mixed and treated.

[0010] Specifically, on one side of the surface of the sedimentation tank, a supernatant discharge pipe communicating with the inside of the sedimentation tank is installed. On both sides of the top of the sedimentation tank, chute A is provided. At the four corner positions of the bottom of the top plate, support rods are fixedly connected, and at the bottom of the support rods, pulleys located inside chute A are provided. On one side of the side of the sedimentation tank, a hydraulic cylinder A is installed, and the power end of the hydraulic cylinder A is connected to the pulley.

[0011] By adopting the above technical solution, the supernatant is discharged through the supernatant discharge pipe. The bottom of the top plate is connected to the chute through the support rods and the pulleys, so that the top plate can move horizontally on the top of the sedimentation tank. The hydraulic cylinder A provides power to drive the movement of the top plate and the pressing plate. The fixed plate is used to divide the inside of the sedimentation tank into two different intervals. When sedimentation operation is carried out on one side, the other side can be conveniently maintained and cleaned and is in a standby state.

[0012] Specifically, chute B is horizontally opened inside the top plate. At the top of the sleeve, sliders located inside chute B are provided, and the sliders are connected by a connecting rod. On one side of the surface of the top plate, a hydraulic cylinder C is installed, and the power end of the hydraulic cylinder C is connected to the slider.

[0013] By adopting the above technical solution, when the power end of the hydraulic cylinder C moves, it controls the movement of the slider inside chute B, and then drives the movement of the partition through the sleeve and the control rod, and adjusts the opening state of the partition to meet the requirements of different processes.

[0014] Specifically, a rubber sleeve that fits to the inner wall of the sedimentation tank is coated on the outer periphery of the pressing plate.

[0015] By adopting the above technical solution, the rubber sleeve structure coated on the outer periphery of the pressing plate is closely attached to the inner wall of the sedimentation tank, and can maintain the sealing performance at the connection position between the outer periphery of the pressing plate and the inner wall of the sedimentation tank during the downward movement of the pressing plate.

[0016] Specifically, a one-way valve is installed inside the flocculant inlet pipe. A drain pipe extending into the pressing plate is installed at the discharge end of the volute. A discharge pipe communicating with the inside of the drain pipe is installed at the end of the confluence pipe, and an electromagnetic three-way valve B is installed at the connection between the discharge pipe and the confluence pipe. The discharge end of the confluence pipe communicates with the inside of the volute.

[0017] By adopting the above technical solution, the wastewater and coagulant output from inside the volute are input into the sedimentation tank through the drain pipe. The discharge end of the confluence pipe can flow into the inside of the volute or the discharge pipe. The discharge direction of the discharge end of the confluence pipe can be regulated by the electromagnetic three-way valve B.

[0018] Specifically, a clamping groove is vertically formed on the inner wall of the transmission sleeve. A transmission shaft is inserted at the bottom of the transmission sleeve, and a clamping block inserted into the clamping groove is integrally formed on the outer periphery of the transmission shaft. A stirring rod located at the bottom of the pressing plate is installed at the bottom of the transmission shaft.

[0019] By adopting the above technical solution, the transmission shaft and the traditional sleeve are connected by the clamping groove and the clamping block, which not only does not affect the lifting of the pressing plate, but also can realize the movement of the transmission sleeve driving the transmission rod and then drive the rotation of the stirring rod regardless of the height position of the pressing plate.

[0020] Specifically, a conveyor belt for conveying and discharging the sediment is horizontally installed between the bottom of the hopper and the bottom of the reaction tank.

[0021] By adopting the above technical solution, when the sediment is discharged from the hopper, it is directly discharged onto the surface of the conveyor belt and discharged by the conveyor belt.

[0022] The beneficial effects of the present invention:

[0023] For the electroplating wastewater recovery and treatment equipment of the present invention, the control rod structure can horizontally move under the action of the external power equipment component to adjust the position of the partition plate. During the normal flocculation and sedimentation treatment process, the pressing plate is at a position close to the liquid level. At this time, the partition plate body is inserted into the slot, and the through groove is in a fully open state. After the flocculation and sedimentation treatment is completed, the hydraulic cylinder C operates to move the partition plate towards the filter plate until the partition plate is close to the top of the filter plate. At this time, the hydraulic cylinder B operates to drive the pressing plate to move downwards. At the same time, during the downward movement, the supernatant will penetrate through the filter plate and seep into the top of the pressing plate, and the flocculants will be pressed down by the pressing plate into the hopper. As the pressing plate continues to move downwards, the flocculants can be squeezed and dehydrated to reduce the water content in the sediment. Before the sediment is discharged, the partition plate continues to move until it completely covers the filter plate and blocks the through groove, thereby isolating the sediment from the supernatant and preventing the supernatant from being mixed in during the sediment discharge process. The pressing plate structure that can adjust the height and the internal opening can realize the pre-dehydration treatment of the sediment during the sediment discharge process in the sedimentation tank, reduce the time-consuming of the subsequent dehydration process, and reduce the water content inside the sediment.

[0024] In a plating wastewater recovery and treatment device according to the present invention, the wastewater after preliminary reaction inside the reaction tank is input into the confluence pipe through the wastewater inlet pipe under the action of a pump body. During the input process, the primary precipitant sodium hydroxide is discharged from the flocculant inlet pipe. Inside the confluence pipe, preliminary mixing is achieved by the intersection and circulation of the water bodies. At the same time, during the mixing process, the water flow impact force drives the rotation of the rotating shaft and the stirring blades. Inside the confluence pipe, after the sodium hydroxide and the wastewater are fully mixed, they are then discharged into the sedimentation tank through the discharge pipe for flocculation reaction. During the discharge process of the wastewater and the flocculant, mixing treatment is carried out using the water flow inertia and impact force, reducing the subsequent mixing time and simultaneously reducing the energy consumption of the externally installed mixing equipment.

[0025] In a plating wastewater recovery and treatment device according to the present invention, in the later stage of the flocculation reaction, an auxiliary agent is discharged from the auxiliary agent inlet pipe and a composite flocculant is discharged from the flocculant inlet pipe simultaneously. The composite flocculant is prepared by mixing an inorganic flocculant, a polymer flocculant, and a buffer solution. Through the adjustment of the electromagnetic three-way valve B, the water flow enters the volute interior and uses the water flow impact to rotate the turbine. Under the water flow impact, the turbine rotates and drives the rotation of the transmission sleeve and the transmission shaft, enabling the wastewater and the flocculant discharged into the sedimentation tank to be further fully mixed and treated. During the initial stage of flocculation, chromium hydroxide is suspended in the supernatant in the form of colloidal particles, and further flocculation treatment is carried out on it by the added composite flocculant to separate it from the supernatant. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the drawings and embodiments.

[0027] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 is a schematic diagram of the pressing plate structure of the present invention;

[0029] Figure 3 is a schematic diagram of the internal structure of the through groove of the present invention;

[0030] Figure 4 is a schematic diagram of the connection structure between the top plate and the pressing plate of the present invention;

[0031] Figure 5 is a schematic diagram of the internal structure of the top plate of the present invention;

[0032] Figure 6 is a schematic top view of the sedimentation tank of the present invention;

[0033] In the figure: 100, reaction tank; 200, sedimentation tank; 201, fixing plate; 202, supernatant discharge pipe; 203, chute A; 204, support rod; 205, pulley; 206, hydraulic cylinder A; 207, hopper; 300, top plate; 301, hydraulic cylinder B; 302, pressing plate; 303, through slot; 304, filter plate; 305, slot; 306, partition plate; 307, control rod; 308, sleeve; 309, chute B; 310, slider; 311, connecting rod; 312, hydraulic cylinder C; 313, rubber sleeve; 400, confluence pipe; 401, waste water inlet pipe; 402, auxiliary agent inlet pipe; 403, electromagnetic three-way valve A; 404, flocculant inlet pipe; 405, check valve; 406, rotating shaft; 407, stirring paddle; 408, discharge pipe; 409, volute; 410, turbine; 411, electromagnetic three-way valve B; 412, transmission sleeve; 413, card slot; 414, transmission shaft; 415, clamping block; 416, stirring rod; 417, drain pipe; 500, conveyor belt. Specific implementation mode

[0034] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation modes.

[0035] Embodiment 1:

[0036] The technical solution adopted by the present invention to solve its technical problems is an electroplating wastewater recovery and treatment device, including a reaction tank 100. A sedimentation tank 200 for flocculation precipitation is arranged at the discharge end of the reaction tank 100. A fixing plate 201 is welded at the middle position inside the sedimentation tank 200, and a hopper 207 for storing flocculated sediment is welded at the bottom of the sedimentation tank 200.

[0037] The top of the sedimentation tank 200 is movably connected with a top plate 300, and a hydraulic cylinder B 301 is installed on the top of the top plate 300. A pressing plate 302 located at the bottom of the top plate 300 and inserted into the sedimentation tank 200 is installed at the power output end of the hydraulic cylinder B 301. A through slot 303 is opened inside the pressing plate 302, and filter plates 304 are installed at one end inside the through slot 303. A slot 305 is opened on one side of the pressing plate 302 close to the through slot 303, and a partition plate 306 located on the top of the filter plate 304 is inserted into the slot 305. A sleeve 308 is installed at the bottom of the top plate 300, and a control rod 307 inserted into the sleeve 308 is fixedly connected to the top of the partition plate 306.

[0038] During use, the control rod 307 structure can be horizontally moved under the action of an external power equipment component to adjust the position of the partition plate 306. During the normal flocculation and sedimentation treatment process, the pressing plate 302 is at a position close to the liquid level. At this time, the main body of the partition plate 306 is inserted into the slot 305, and the through groove 303 is in a fully open state. After the flocculation and sedimentation treatment is completed, the hydraulic cylinder C312 operates to move the partition plate 306 towards the filter plate 304 until the partition plate 306 is close to the top of the filter plate 304. At this time, the hydraulic cylinder B301 operates to drive the pressing plate 302 to move downward. At the same time, during the downward movement, the supernatant will penetrate through the filter plate 304 and seep into the top of the pressing plate 302, and the flocs will be pressed downward by the pressing plate 302 into the hopper 207. As the pressing plate 302 continues to move downward, the flocs can be subjected to extrusion dehydration treatment to reduce the water content in the sediment. Before the sediment is discharged, the partition plate 306 continues to move until it completely covers the filter plate 304 and blocks the through groove 303, thereby isolating the sediment from the supernatant and preventing the supernatant from being mixed in during the external discharge of the sediment.

[0039] Specifically, a manifold pipe 400 is embedded inside the top plate 300, and a wastewater inlet pipe 401 connected to the manifold pipe 400 is installed at the discharge end of the reaction tank 100 through a pump body. One side of the surface of the wastewater inlet pipe 401 is provided with an auxiliary agent inlet pipe 402, and an electromagnetic three-way valve A403 is arranged at the connection between the auxiliary agent inlet pipe 402 and the wastewater inlet pipe 401. One side of the top of the top plate 300 is provided with a flocculant inlet pipe 404 connected to a precipitant supply device, and the discharge end of the flocculant inlet pipe 404 is connected to the manifold pipe 400. A rotating shaft 406 is installed inside the manifold pipe 400, and stirring blades 407 are fixedly connected to the outer periphery of the rotating shaft 406. One end of the top plate 300 is vertically provided with a volute 409, and a turbine 410 is installed inside the volute 409. A transmission sleeve 412 extending to the bottom of the top plate 300 is installed at the central position of the turbine 410.

[0040] During use, the wastewater that has undergone preliminary reaction inside the reaction tank 100 is input into the confluence pipe 400 through the wastewater inlet pipe 401 under the action of the pump body. During the input process, the initial precipitant sodium hydroxide is discharged from the flocculant inlet pipe 404. Inside the confluence pipe 400, preliminary mixing is achieved through the intersection and circulation of the water body. At the same time, during the mixing process, the water flow impact force will drive the rotation of the rotating shaft 406 and the stirring blades 407. Inside the confluence pipe 400, after the sodium hydroxide is fully mixed with the wastewater, it is then discharged into the sedimentation tank 200 through the discharge pipe 408 for flocculation reaction. In the later stage of the flocculation reaction, the auxiliary agent is discharged from the auxiliary agent inlet pipe 402 and the composite flocculant is discharged from the flocculant inlet pipe 404. The electromagnetic three-way valve B411 is adjusted to make the water flow into the volute 409 and utilize the water flow impact to rotate the turbine 410. Under the water flow impact, the turbine 410 rotates and drives the rotation of the transmission sleeve 412 and the transmission shaft 414, so that the wastewater and the flocculant discharged into the sedimentation tank 200 can be further fully mixed and treated.

[0041] Specifically, on one side of the surface of the sedimentation tank 200, a supernatant discharge pipe 202 communicating with the inside of the sedimentation tank 200 is installed. On both sides of the top of the sedimentation tank 200, sliding grooves A203 are opened. At the four corner positions of the bottom of the top plate 300, support rods 204 are fixedly connected, and at the bottom of the support rods 204, pulleys 205 located inside the sliding grooves A203 are provided. On one side of the side of the sedimentation tank 200, a hydraulic cylinder A206 is installed, and the power end of the hydraulic cylinder A206 is connected to the pulley 205.

[0042] During use, the supernatant is discharged through the supernatant discharge pipe 202. The bottom of the top plate 300 is connected to the sliding groove through the support rods 204 and the pulleys 205, so that the top plate 300 can move horizontally on the top of the sedimentation tank 200. The hydraulic cylinder A206 provides power to drive the movement of the top plate 300 and the pressing plate 302. The fixed plate 201 is used to divide the inside of the sedimentation tank 200 into two different intervals. When sedimentation operation is carried out on one side, the other side can be conveniently maintained and cleaned and is in a standby state.

[0043] Specifically, a sliding groove B309 is horizontally opened inside the top plate 300. At the top of the sleeve 308, sliders 310 located inside the sliding groove B309 are provided, and the sliders 310 are connected by a connecting rod 311. On one side of the surface of the top plate 300, a hydraulic cylinder C312 is installed, and the power end of the hydraulic cylinder C312 is connected to the slider 310.

[0044] During use, when the power end of the hydraulic cylinder C312 moves, it controls the sliders 310 to move inside the sliding groove B309, and then drives the movement of the partition plate 306 through the sleeve 308 and the control rod 307, and adjusts the opening state of the partition plate 306 to meet the requirements of different processes.

[0045] Specifically, a rubber sleeve 313 that fits against the inner wall of the sedimentation tank 200 is wrapped around the outer periphery of the pressing plate 302.

[0046] During use, the rubber sleeve 313 wrapped around the outer periphery of the pressing plate 302 is tightly attached to the inner wall of the sedimentation tank 200, and can maintain the sealing performance at the connection between the outer periphery of the pressing plate 302 and the inner wall of the sedimentation tank 200 during the downward movement of the pressing plate 302.

[0047] Specifically, a check valve 405 is installed inside the flocculant inlet pipe 404, a drain pipe 417 extending into the pressing plate 302 is installed at the discharge end of the volute 409, a discharge pipe 408 communicating with the inside of the drain pipe 417 is installed at the end of the confluence pipe 400, and an electromagnetic three-way valve B411 is installed at the connection between the discharge pipe 408 and the confluence pipe 400. The discharge end of the confluence pipe 400 is communicated with the inside of the volute 409.

[0048] During use, the wastewater and coagulant output from inside the volute 409 are input into the sedimentation tank 200 through the drain pipe 417. The discharge end of the confluence pipe 400 can flow into the inside of the volute 409 or the inside of the discharge pipe 408. The discharge direction of the discharge end of the confluence pipe 400 can be regulated through the electromagnetic three-way valve B411.

[0049] Specifically, a clamping groove 413 is vertically formed on the inner wall of the transmission sleeve 412. A transmission shaft 414 is inserted at the bottom of the transmission sleeve 412, and a clamping block 415 inserted into the clamping groove 413 is integrally formed on the outer periphery of the transmission shaft 414. A stirring rod 416 located at the bottom of the pressing plate 302 is installed at the bottom of the transmission shaft 414.

[0050] During use, the transmission shaft 414 is connected to the traditional sleeve through the clamping groove 413 and the clamping block 415, which not only does not affect the lifting of the pressing plate 302, but also can drive the movement of the transmission rod by the transmission sleeve 412 and then drive the rotation of the stirring rod 416 regardless of the height position of the pressing plate 302.

[0051] Specifically, a conveyor belt 500 for conveying and discharging the sediment is horizontally installed between the bottom of the hopper 207 and the bottom of the reaction tank 100.

[0052] During use, when the sediment is discharged from the hopper 207, it is directly discharged onto the surface of the conveyor belt 500 and discharged by the conveyor belt 500.

[0053] During use, the control rod 307 structure can be horizontally moved under the action of an external power equipment component to adjust the position of the partition plate 306. During the normal flocculation and sedimentation treatment process, the pressing plate 302 is at a position fitting the liquid level height. At this time, the main body of the partition plate 306 is inserted into the inside of the slot 305, and the through groove 303 is in a fully open state. After the flocculation and sedimentation treatment is completed, the hydraulic cylinder C312 operates to move the partition plate 306 towards the filter plate 304 until the partition plate 306 approaches the top of the filter plate 304. At this time, the hydraulic cylinder B301 operates to drive the pressing plate 302 to move downward. At the same time, during the downward movement, the supernatant will penetrate through the filter plate 304 and seep into the top of the pressing plate 302, and the flocs will be pressed down by the pressing plate 302 into the hopper 207. As the pressing plate 302 continuously moves downward, the flocs can be subjected to extrusion dehydration treatment to reduce the water content in the sediment. Before the sediment is discharged, the partition plate 306 continues to move until it completely covers the filter plate 304 and blocks the through groove 303, thereby isolating the sediment from the supernatant and preventing the supernatant from being mixed in during the external discharge of the sediment. By adopting the pressing plate 302 structure that can adjust the height and the internal opening, it is possible to realize the pre-dehydration treatment of the sediment during the discharge of the sediment in the sedimentation tank 200, reduce the time-consuming of the subsequent dehydration process, and reduce the water content inside the sediment. The wastewater after preliminary reaction inside the reaction tank 100 is input into the confluence pipe 400 by the wastewater inlet pipe 401 under the action of a pump body. During the input process, the initial precipitant sodium hydroxide is discharged from the flocculant inlet pipe 404. Inside the confluence pipe 400, preliminary mixing is realized by using the intersection and circulation of the water bodies. At the same time, during the mixing process, the water flow impact force will drive the rotation of the rotating shaft 406 and the stirring blades 407. After the sodium hydroxide and the wastewater are fully mixed inside the confluence pipe 400, they are then discharged into the sedimentation tank 200 through the discharge pipe 408 for flocculation reaction. During the discharge of the wastewater and the flocculant, mixing treatment is carried out by using the water flow inertia and impact force, reducing the subsequent mixing time-consuming and at the same time reducing the energy consumption of the externally installed mixing equipment.

[0054] Embodiment 2:

[0055] The technical solution adopted by the present invention to solve its technical problems is an electroplating wastewater recovery and treatment device, including a reaction tank 100. The discharge end of the reaction tank 100 is provided with a sedimentation tank 200 for flocculation and sedimentation. A fixed plate 201 is welded at the middle position inside the sedimentation tank 200, and a hopper 207 for storing flocculated sediment is welded at the bottom of the flocculation tank;

[0056] A top plate 300 is movably connected to the top of the sedimentation tank 200, and a hydraulic cylinder B301 is installed on the top of the top plate 300. A pressing plate 302 located at the bottom of the top plate 300 and inserted into the sedimentation tank 200 is installed at the power output end of the hydraulic cylinder B301. A through groove 303 is formed inside the pressing plate 302, and filter plates 304 are installed at one end of the through groove 303. A slot 305 is formed on one side of the pressing plate 302 close to the through groove 303, and a partition plate 306 located on the top of the filter plate 304 is inserted into the slot 305. A sleeve 308 is installed at the bottom of the top plate 300, and a control rod 307 inserted into the sleeve 308 is fixedly connected to the top of the partition plate 306.

[0057] During use, the control rod 307 structure can horizontally move under the action of an external power equipment component to adjust the position of the partition plate 306. During the normal flocculation sedimentation process, the pressing plate 302 is at a position fitting the liquid level height. At this time, the main body of the partition plate 306 is inserted into the slot 305, and the through groove 303 is in a fully open state. After the flocculation sedimentation process is completed, the hydraulic cylinder C312 operates to move the partition plate 306 towards the filter plate 304 until the partition plate 306 is close to the top of the filter plate 304. At this time, the hydraulic cylinder B301 operates to drive the pressing plate 302 to move downward. At the same time, during the downward movement, the supernatant will penetrate through the filter plate 304 and seep to the top of the pressing plate 302, and the flocs will be pressed down by the pressing plate 302 into the hopper 207. As the pressing plate 302 continues to move downward, the flocs can be squeezed and dehydrated to reduce the water content in the sediment. Before the sediment is discharged, the partition plate 306 continues to move until it completely covers the filter plate 304 and blocks the through groove 303, thereby isolating the sediment from the supernatant and preventing the supernatant from being mixed in during the external discharge of the sediment.

[0058] Specifically, a confluence pipe 400 is embedded in the top plate 300, and a waste water inlet pipe 401 connected to the confluence pipe 400 is installed at the discharge end of the reaction tank 100 through a pump body. An auxiliary agent inlet pipe 402 is installed on one side of the surface of the waste water inlet pipe 401, and an electromagnetic three-way valve A403 is arranged at the connection between the auxiliary agent inlet pipe 402 and the waste water inlet pipe 401. A flocculant inlet pipe 404 connected to a sediment agent supply device is installed on one side of the top of the top plate 300, and the discharge end of the flocculant inlet pipe 404 is connected to the confluence pipe 400. A rotating shaft 406 is installed inside the confluence pipe 400, and stirring blades 407 are fixedly connected to the outer circumference of the rotating shaft 406. A volute 409 is installed vertically at one end inside the top plate 300, and a turbine 410 is installed inside the volute 409. A transmission sleeve 412 extending to the bottom of the top plate 300 is installed at the central position of the turbine 410.

[0059] During use, the wastewater that has undergone preliminary reaction inside the reaction tank 100 is input into the confluence pipe 400 through the wastewater inlet pipe 401 under the action of the pump body. During the input process, the initial precipitant sodium hydroxide is discharged from the flocculant inlet pipe 404. Inside the confluence pipe 400, preliminary mixing is achieved through the intersection and circulation of the water body. At the same time, during the mixing process, the water flow impact force drives the rotation of the rotating shaft 406 and the stirring blades 407. Inside the confluence pipe 400, after the sodium hydroxide is fully mixed with the wastewater, it is then discharged into the sedimentation tank 200 through the discharge pipe 408 for flocculation reaction. In the later stage of the flocculation reaction, the auxiliary agent is discharged from the auxiliary agent inlet pipe 402 and the composite flocculant is discharged from the flocculant inlet pipe 404. Through the adjustment of the electromagnetic three-way valve B411, the water flow enters the volute 409 inside and uses the water flow impact to rotate the turbine 410. Under the water flow impact, the turbine 410 rotates and drives the rotation of the transmission sleeve 412 and the transmission shaft 414, so that the wastewater and the flocculant discharged into the sedimentation tank 200 can be further fully mixed and treated.

[0060] Specifically, on one side of the surface of the sedimentation tank 200, a supernatant discharge pipe 202 connected to the inside of the sedimentation tank 200 is installed. On both sides of the top of the sedimentation tank 200, sliding grooves A203 are opened. At the four corner positions of the bottom of the top plate 300, support rods 204 are fixedly connected, and at the bottom of the support rods 204, pulleys 205 located inside the sliding grooves A203 are provided. On one side of the side of the sedimentation tank 200, a hydraulic cylinder A206 is installed, and the power end of the hydraulic cylinder A206 is connected to the pulley 205.

[0061] During use, the supernatant is discharged through the supernatant discharge pipe 202. The bottom of the top plate 300 is connected to the sliding groove through the support rods 204 and the pulleys 205, so that the top plate 300 can move horizontally on the top of the sedimentation tank 200. The hydraulic cylinder A206 provides power to drive the movement of the top plate 300 and the pressing plate 302. The fixing plate 201 is used to divide the inside of the sedimentation tank 200 into two different intervals. When sedimentation operation is carried out on one side, the other side can be conveniently maintained and cleaned and is in a standby state.

[0062] Specifically, a sliding groove B309 is horizontally opened inside the top plate 300. At the top of the sleeve 308, sliders 310 located inside the sliding groove B309 are provided, and the sliders 310 are connected by a connecting rod 311. On one side of the surface of the top plate 300, a hydraulic cylinder C312 is installed, and the power end of the hydraulic cylinder C312 is connected to the slider 310.

[0063] During use, when the power end of the hydraulic cylinder C312 moves, it controls the movement of the slider 310 inside the sliding groove B309, and then drives the movement of the partition plate 306 through the sleeve 308 and the control rod 307, and adjusts the opening state of the partition plate 306 to meet the requirements of different processes.

[0064] Specifically, a rubber sleeve 313 that fits against the inner wall of the sedimentation tank 200 is wrapped around the outer periphery of the pressing plate 302.

[0065] During use, the rubber sleeve 313 wrapped around the outer periphery of the pressing plate 302 is tightly attached to the inner wall of the sedimentation tank 200, and can maintain the sealing performance at the connection between the outer periphery of the pressing plate 302 and the inner wall of the sedimentation tank 200 during the downward movement of the pressing plate 302.

[0066] Specifically, a check valve 405 is installed inside the flocculant inlet pipe 404, a drain pipe 417 extending into the pressing plate 302 is installed at the discharge end of the volute 409, a discharge pipe 408 communicating with the inside of the drain pipe 417 is installed at the end of the confluence pipe 400, and an electromagnetic three-way valve B411 is installed at the connection between the discharge pipe 408 and the confluence pipe 400. The discharge end of the confluence pipe 400 communicates with the inside of the volute 409.

[0067] During use, the wastewater and coagulant output from the inside of the volute 409 are input into the sedimentation tank 200 through the drain pipe 417. The discharge end of the confluence pipe 400 can flow into the inside of the volute 409 or the inside of the discharge pipe 408. The discharge direction of the discharge end of the confluence pipe 400 can be regulated through the electromagnetic three-way valve B411.

[0068] Specifically, a card slot 413 is vertically formed on the inner wall of the transmission sleeve 412. A transmission shaft 414 is inserted into the bottom of the transmission sleeve 412, and a clamping block 415 inserted into the card slot 413 is integrally formed on the outer periphery of the transmission shaft 414. A stirring rod 416 located at the bottom of the pressing plate 302 is installed at the bottom of the transmission shaft 414.

[0069] During use, the transmission shaft 414 is connected to the traditional sleeve through the card slot 413 and the clamping block 415, which not only does not affect the lifting of the pressing plate 302, but also enables the transmission sleeve 412 to drive the transmission rod to move and then drive the stirring rod 416 to rotate regardless of the height position of the pressing plate 302.

[0070] Specifically, a conveyor belt 500 for conveying and discharging the sediment is horizontally installed between the bottom of the hopper 207 and the bottom of the reaction tank 100.

[0071] During use, when the sediment is discharged from the hopper 207, it is directly discharged onto the surface of the conveyor belt 500 and discharged by the conveyor belt 500.

[0072] During use, the control rod 307 structure can move horizontally under the action of an external power equipment component to adjust the position of the partition plate 306. During the normal flocculation and sedimentation treatment process, the pressing plate 302 is at a position that fits the liquid level height. At this time, the main body of the partition plate 306 is inserted into the inside of the slot 305, and the through groove 303 is in a fully open state. After the flocculation and sedimentation treatment is completed, the hydraulic cylinder C312 operates to move the partition plate 306 towards the filter plate 304 until the partition plate 306 is close to the top of the filter plate 304. At this time, the hydraulic cylinder B301 operates to drive the pressing plate 302 to move downward. At the same time, during the downward movement, the supernatant will penetrate through the filter plate 304 and seep into the top of the pressing plate 302, and the flocs will be pressed down by the pressing plate 302 into the hopper 207. As the pressing plate 302 continues to move downward, the flocs can be squeezed and dehydrated to reduce the water content in the sediment. Before the sediment is discharged, the partition plate 306 continues to move until it completely covers the filter plate 304 and blocks the through groove 303, thereby isolating the sediment from the supernatant and preventing the supernatant from being mixed in during the external discharge of the sediment. By using the pressing plate 302 structure that can adjust the height and the internal opening, it is possible to realize the pre-dehydration treatment of the sediment during the discharge of the sediment in the sedimentation tank 200, reduce the time-consuming of the subsequent dehydration process, and reduce the water content inside the sediment. In the later stage of the flocculation reaction, the auxiliary agent is discharged into the auxiliary agent inlet pipe 402 and the composite flocculant is discharged into the flocculant inlet pipe 404 at the same time. The composite flocculant is prepared by mixing an inorganic flocculant, a polymer flocculant, and a buffer solution. Through the adjustment of the electromagnetic three-way valve B411, the water flow enters the inside of the volute 409 and uses the water flow impact to rotate the turbine 410. Under the impact of the water flow, the turbine 410 rotates and drives the rotation of the transmission sleeve 412 and the transmission shaft 414, so that the wastewater and the flocculant discharged into the sedimentation tank 200 can be further fully mixed and treated. In the initial stage of the flocculation process, chromium hydroxide is suspended in the supernatant in the form of colloidal particles. Through the added composite flocculant, it is further flocculated and separated from the supernatant. At this time, the dehydration and external discharge treatment of the sediment is carried out. By using the flocculants at both ends to treat the chromium-containing electroplating wastewater, the high-concentration chromium can be converted into Cr(OH)3 through flocculation precipitation. Cr(0H)3 can be converted into Cr2O3 through high-temperature decomposition. Cr203 is compounded into a polishing paste and used for polishing machine parts, and its polishing effect is good, fully recovering and utilizing the chromium in the electroplating wastewater and reducing environmental pollution.

[0073] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. An electroplating wastewater recovery and treatment device, comprising a reaction tank (100), wherein a sedimentation tank (200) for flocculation sedimentation is arranged at the discharge end of the reaction tank (100), a fixing plate (201) is welded at the middle position inside the sedimentation tank (200), and a hopper (207) for storing flocculated sediment is welded at the bottom of the sedimentation tank (200); It is characterized in that The top of the sedimentation tank (200) is movably connected to a top plate (300), and a hydraulic cylinder B (301) is installed on the top of the top plate (300). A pressure plate (302) located at the bottom of the top plate (300) and inserted into the sedimentation tank (200) is installed at the power output end of the hydraulic cylinder B (301). A through groove (303) is provided inside the pressure plate (302), and a filter plate (304) is installed at one end of the through groove (303). A slot (305) is provided inside the pressure plate (302) near the through groove (303), and the slot (30 5) a partition (306) located on the top of the filter plate (304) is inserted inside, a sleeve (308) is installed at the bottom of the top plate (300), and a control rod (307) inserted into the sleeve (308) is fixedly connected to the top of the partition (306), a manifold (400) is embedded inside the top plate (300), and a wastewater inlet pipe (401) connected to the manifold (400) is installed at the discharge end of the reaction tank (100) through a pump body, and an auxiliary agent inlet pipe (402) is installed on one side of the surface of the wastewater inlet pipe (401), and the auxiliary agent inlet pipe (402) is connected to the manifold (400). An electromagnetic three-way valve A (403) is provided at the connection between the top plate (402) and the wastewater inlet pipe (401), a flocculant inlet pipe (404) connected to the precipitant supply device is installed on one side of the top of the top plate (300), and the discharge end of the flocculant inlet pipe (404) is connected to the manifold (400), a rotating shaft (406) is installed inside the manifold (400), and a stirring blade (407) is fixedly connected to the outer periphery of the rotating shaft (406), a volute (409) is installed vertically at one end of the top plate (300), and the inside of the volute (409) A turbine (410) is installed at the top of the top plate (300), a transmission sleeve (412) extending to the bottom of the top plate (300) is installed at the center of the turbine (410), a slide groove B (309) is opened in the horizontal direction inside the top plate (300), a slider (310) located inside the slide groove B (309) is arranged at the top of the sleeve (308), and the sliders (310) are connected by a connecting rod (311), and a hydraulic cylinder C (312) is installed on one side of the surface of the top plate (300), and the power end of the hydraulic cylinder C (312) is connected to the slider (310).

2. The electroplating wastewater recycling and treatment equipment according to claim 1 is characterized in that: A supernatant discharge pipe (202) connected to the interior of the sedimentation tank (200) is installed on one side of the surface of the sedimentation tank (200), and slide grooves A (203) are opened on both sides of the top of the sedimentation tank (200). Support rods (204) are fixedly connected to the four corners of the bottom of the top plate (300), and pulleys (205) located inside the slide grooves A (203) are arranged at the bottom of the support rods (204). A hydraulic cylinder A (206) is installed on one side of the side of the sedimentation tank (200), and the power end of the hydraulic cylinder A (206) is connected to the pulley (205).

3. The electroplating wastewater recycling and treatment equipment according to claim 2 is characterized in that: The outer periphery of the pressing plate (302) is coated with a rubber sleeve (313) that fits to the inner wall of the sedimentation tank (200).

4. The electroplating wastewater recycling and treatment equipment according to claim 3 is characterized in that: A one-way valve (405) is installed inside the flocculant inlet pipe (404); a drainage pipe (417) extending to the inside of the pressure plate (302) is installed at the discharge end of the volute (409); a discharge pipe (408) connected to the inside of the drainage pipe (417) is installed at the end of the manifold (400); an electromagnetic three-way valve B (411) is installed at the connection between the discharge pipe (408) and the manifold (400); and the discharge end of the manifold (400) is connected to the inside of the volute (409).

5. The electroplating wastewater recycling and treatment equipment according to claim 4 is characterized in that: A slot (413) is provided on the inner wall of the transmission sleeve (412) in a vertical direction, a transmission shaft (414) is inserted into the bottom of the transmission sleeve (412), and a block (415) is integrally formed on the outer circumference of the transmission shaft (414) and is inserted into the slot (413), and a stirring rod (416) located at the bottom of the pressure plate (302) is installed at the bottom of the transmission shaft (414).

6. The electroplating wastewater recycling and treatment equipment according to claim 5, characterized in that: A conveyor belt (500) for conveying and discharging sediment is installed in a horizontal direction between the bottom of the hopper (207) and the bottom of the reaction tank (100).

Images