Recycling device for electroplating wastewater treatment

Abstract

The invention relates to the technical field of wastewater treatment, and particularly discloses a recycling device for electroplating wastewater treatment, which comprises a stirring mechanism, a dosage adjusting mechanism, a buffer mechanism, a separation mechanism and a post-treatment mechanism. The dosage adjusting mechanism can detect the concentration of metal ions in the electroplating wastewater, a proper amount of precipitant is added according to the concentration of the metal ions, the stirring mechanism stirs the electroplating wastewater in the stirring area at the moment, the precipitant generates precipitates to be separated out, and the precipitates located on the lowermost layer of the stirring area can enter the buffer area; the electroplating wastewater reaches the standing area after being buffered by the buffering mechanism to form distribution of supernatant liquid and lower precipitate, the separation mechanism filters the supernatant liquid and pushes the precipitate out of the treatment tank from the bottom of the treatment tank, so that the separation of the supernatant liquid and the lower precipitate is realized, and the recovery of metal ions in the electroplating wastewater is realized. The wastewater treatment quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a circulating recovery device for treating electroplating wastewater. Background Art

[0002] Electroplating is a process of plating a layer of metal or alloy on the surface of metal or non-metal through an electrochemical reaction, which is widely used in industrial production to improve the corrosion resistance, electrical conductivity, hardness and aesthetics of workpieces. During the electroplating process, workpieces need to go through multiple processes, including pretreatment, plating and post-treatment. Electroplating wastewater is mainly generated in these processes, especially in the rinsing process and the discharge of waste electroplating solution. The wastewater usually contains a large amount of heavy metal ions (such as nickel, chromium, copper, zinc, etc.), acid-base components and other harmful substances. If directly discharged without treatment, it will pose a serious threat to the environment and the ecosystem.

[0003] At present, the treatment of electroplating wastewater in industry widely adopts a comprehensive treatment process combining physical, chemical and biological methods, among which chemical precipitation method is the most common. For example, a circulating recovery device for treating electroplating wastewater disclosed in CN112897754A uses a ferrous sulfate solution to treat electroplating wastewater containing chromium ions, and finally converts the heavy metal ions in the wastewater into insoluble precipitates by adding a reducing agent or a precipitant, and separates the precipitates from the liquid by gravity. To achieve this goal, the treatment of wastewater usually starts with adjusting the pH value, controlling the precipitation conditions of metal ions in the wastewater, and adding a precipitant under stirring conditions to ensure uniform reaction and promote the precipitation of metal ions. The treated wastewater will enter the static area, and the heavy metal ions will form sludge through gravity sedimentation, while the supernatant will be further treated or discharged.

[0004] Although the chemical precipitation method and its supporting processes have been widely used, there is still room for improvement in its structural design and operation mode in terms of wastewater treatment efficiency. Taking the static area as an example, the structure of the traditional sedimentation tank is usually fixed, and the boundary between the static area and the stirring area is not clear enough. The wastewater with large fluidity in the stirring area is easy to interfere with the static area, causing some precipitates to not completely precipitate and settle to the bottom.

[0005] At the same time, due to the fixed volume of the static area, it cannot be dynamically adjusted according to the actual concentration of metal ions in the wastewater or the treatment requirements, which may lead to insufficient capacity of the static area or waste of resources, and is not energy-saving and environmentally friendly enough. In addition, the traditional sedimentation tank generally relies on manual or periodic mechanical operation for discharging the bottom sediment, making it difficult to achieve continuous and efficient sediment removal. The long-term accumulation of sediment will further affect the treatment effect and operation stability, resulting in poor quality of wastewater treatment. These defects and limitations in the conventional technology make the wastewater treatment process lack flexibility and intelligent control means. Summary of the Invention

[0006] In order to dynamically treat electroplating wastewater according to the concentration of metal ions in the wastewater and improve the adaptability and efficiency of wastewater treatment, the present application provides a circulating recovery device for treating electroplating wastewater.

[0007] The circulating recovery device for treating electroplating wastewater provided by the present application adopts the following technical solutions: A circulating recovery device for treating electroplating wastewater includes a liquid storage tank and a treatment tank. A connecting pipe is provided between the liquid storage tank and the treatment tank. The liquid storage tank is filled with electroplating wastewater to be treated, and a first one-way valve for unidirectionally flowing the electroplating wastewater in the liquid storage tank into the treatment tank is provided in the connecting pipe; The treatment tank is sequentially divided into a stirring area, a buffer area, and a static area from top to bottom. The connecting pipe is communicated with the inner cavity of the stirring area of the treatment tank. A stirring mechanism for stirring the electroplating wastewater entering the stirring area is provided in the stirring area. A dosage adjusting mechanism for adjusting the addition amount of the precipitant according to the concentration of metal ions in the electroplating wastewater is provided on the treatment tank where the stirring area is located; A buffer mechanism for buffering the electroplating wastewater solution stirred in the stirring area is provided in the buffer area. The buffer mechanism can make the electroplating wastewater solution in the stirring area stand still when it reaches the static area, and can adjust the area size ratio between the stirring area and the static area according to the concentration of metal ions in the electroplating wastewater; A separation mechanism for separating the upper clear liquid and the lower precipitate after standing is provided in the treatment tank where the static area is located. When the buffer mechanism moves towards the bottom of the treatment tank, the separation mechanism separates the upper clear liquid and the lower precipitate from each other; A mud outlet is provided at the bottom of the treatment tank, and a post-treatment mechanism for post-treating the flowing mud is connected to the mud outlet.

[0008] By adopting the above technical solution, when the electroplating wastewater in the liquid storage tank enters the treatment tank through the connecting pipe, it first reaches the stirring area. At this time, the dosage adjustment mechanism will detect the concentration of metal ions in the electroplating wastewater reaching the stirring area, and then add an appropriate amount of precipitant according to the size of the metal ion concentration. At this time, the stirring mechanism stirs the electroplating wastewater in the stirring area evenly, so that the precipitant can fully combine with the metal ions in the electroplating wastewater, thereby generating precipitation and separating out. The separated precipitation will rotate in the stirring area with the stirring of the stirring mechanism, so that the precipitation is evenly distributed in the stirring area. During the rotation process, the precipitation at the bottom layer of the stirring area will enter the buffer area, and after the buffering effect of the buffer mechanism, it will reach the static area. At this time, the precipitation slowly settles and gradually stratifies in the static area, and finally forms the distribution of the upper clear liquid and the lower precipitation. At this time, the separation mechanism filters out the upper clear liquid and pushes the precipitation out of the treatment tank from the bottom of the treatment tank to realize the separation of the upper clear liquid and the lower precipitation. The separated precipitation undergoes post-treatment operations by the post-treatment mechanism and finally forms a dry solid without moisture, thereby realizing the recovery of metal ions in the electroplating wastewater and improving the quality of wastewater treatment.

[0009] Optionally, the stirring mechanism includes a driving member and rotating blades. The driving member is arranged on the top of the treatment tank, and the output end extends into the treatment tank. The rotating blades are coaxially fixed on the output shaft of the driving member extending into the inner cavity of the treatment tank.

[0010] By adopting the above technical solution, when the electroplating wastewater enters the stirring area, control the driving member to work, so that the driving member drives the rotating blades to rotate, so as to realize the stirring of the electroplating wastewater in the stirring area, make the precipitant combine more fully with the metal ions in the electroplating wastewater, and thus precipitate the metal ions in the form of precipitation from the electroplating wastewater, so as to treat the electroplating wastewater.

[0011] Optionally, the dosage adjustment mechanism includes a metal ion sensor, a precipitant addition pipe, a solenoid valve and a controller. The metal ion sensor is arranged in the stirring area of the treatment tank. The precipitant addition pipe is arranged on the top of the treatment tank and communicates with the stirring area. The precipitant addition pipe is filled with precipitant. The solenoid valve is installed at the outlet end of the precipitant addition pipe. The controller is electrically connected to the metal ion sensor and the solenoid valve respectively.

[0012] By adopting the above technical solution, the metal ion sensor can detect the concentration of metal ions in the stirring area and transmit the concentration signal to the controller. The controller controls the opening size and opening time of the solenoid valve according to the size of the metal ion concentration, so that an appropriate amount of precipitant is added from the precipitant addition pipe into the stirring area.

[0013] Optionally, the buffer mechanism includes a buffer seat, a connecting rod, and a lifting member. The buffer seat is slidably and sealingly arranged in the treatment tank. A buffer channel is formed in the middle of the buffer seat. A plurality of connecting rods are provided, and one end of each connecting rod is fixedly connected to the upper part of the buffer seat. The lifting member is arranged at the top of the treatment tank, and its lifting end is fixedly connected to the other end of each connecting rod.

[0014] By adopting the above technical solution, the buffer seat can separate the stirring area and the static area, reducing the influence of the liquid in the stirring area on the precipitation and static settlement in the static area, and the lifting member can drive the buffer seat to rise and fall.

[0015] When the concentration of metal ions in the electroplating wastewater is relatively high, the stirring area needs to provide sufficient reaction time and space to ensure the full mixing of the precipitant and metal ions. At this time, the lifting member drives the buffer seat to descend, thereby increasing the volume of the stirring area, increasing the contact area between the electroplating wastewater and the precipitant, and ensuring more complete reaction.

[0016] When the concentration of metal ions in the electroplating wastewater is relatively low, the precipitation reaction is completed relatively quickly. Increasing the volume of the static area can provide more precipitation space, which helps the sediment to settle more completely. At this time, by driving the buffer seat to rise through the lifting member, the volume of the static area is increased, which can reduce the suspension of the sediment and improve the precipitation effect.

[0017] All of the above can better treat the electroplating wastewater and further improve the quality of wastewater treatment.

[0018] Optionally, the inner diameter of the buffer channel gradually decreases from both ends to the middle.

[0019] By adopting the above technical solution, the design of the variable width of the buffer channel can control the flow rate of the wastewater, enabling it to quickly pass through the stirring area and enter the buffer area, and providing an appropriate static time in the static area. By accelerating the flow rate in the middle and slowing down the flow rate at both ends, the mixing efficiency of the precipitant and the wastewater is ensured, and sufficient residence time is provided for the precipitation of metal ions, avoiding incomplete precipitation caused by too fast flow rate.

[0020] Optionally, a plurality of buffer plates are evenly and spaced along the circumferential direction on the top of the buffer seat. The plate surfaces of the buffer plates are perpendicular to the rotation direction of the liquid in the stirring area, and a plurality of flow holes are formed in each buffer plate.

[0021] By adopting the above technical solution, a relatively static buffer area is formed between the stirring area and the static area, which helps to reduce the interference of stirring on the static area and improve the precipitation efficiency.

[0022] Optionally, the separation mechanism includes a mounting base, a separation plate, a torsion spring, an elastic member, and a pressing rod. The mounting base is slidably disposed on the inner wall of the treatment tank where the static zone is located. A plurality of separation plates are provided. One end of each separation plate is rotatably mounted on the mounting base. A plurality of torsion springs corresponding to each separation plate are provided. Each torsion spring is disposed on the axis of rotation of the separation plate and can cause the end of the corresponding separation plate away from the mounting base to rotate in a direction close to the bottom of the buffer seat. A plurality of groups of elastic members are provided. Each elastic member is disposed on the inner wall of the treatment tank where the static zone is located, and one end thereof is fixedly connected to the bottom of the mounting base for providing a force for the mounting base to move in a direction close to the buffer seat. A plurality of pressing rods corresponding to each separation plate are provided. One end of each pressing rod is fixedly connected to the bottom of the buffer seat, and the other end is opposite to the upper end surface of the corresponding separation plate. Separation holes for only liquid to flow through are formed in each separation plate. When each pressing rod presses the corresponding separation plate to be in the same plane, the plate surfaces of each separation plate divide the inner cavity of the treatment tank into upper and lower parts. A second one-way valve for allowing the lower layer of sediment precipitated in the static zone to flow out unidirectionally is provided on the mud outlet.

[0023] By adopting the above technical solution, when the buffer seat moves in a direction close to the static zone, at this time the pressing rod will press the corresponding separation plate to make each separation plate finally coplanar. At this time, each pressing rod will drive the mounting base and each separation plate to move in a direction close to the bottom of the treatment tank. At this time, the upper clear liquid in the static zone passes through the separation holes to reach the upper ends of each separation plate. When the separation plate reaches the separation position between the upper clear liquid and the sediment, since all the upper clear liquid passes through the separation holes to reach the upper ends of the separation plates, the sediment located at the lower end of the separation plate will be pushed downward by the separation plate and finally discharged from the mud outlet, realizing the separation of the upper clear liquid and the sediment. And this is an operation automatically realized when the buffer seat adjusts the ratio of the stirring zone and the static zone, making the whole solid-liquid separation more convenient.

[0024] Optionally, the post-treatment mechanism includes a horizontal solid-liquid separator, a screw conveyor, a circulating reflux assembly, a drying assembly, and a feeding and collecting bin disposed below the mud outlet. The mud outlet at the bottom of the treatment tank is communicated with the middle inner cavity of the horizontal solid-liquid separator. The screw conveyor is communicated with the solid discharge end of the horizontal solid-liquid separator. The feeding and collecting bin is communicated with the end of the screw conveyor. The drying assembly is used for drying the solid material in the screw conveyor. The circulating reflux assembly is communicated with the liquid discharge end of the horizontal solid-liquid separator. The circulating reflux assembly is used for returning the liquid separated by the horizontal solid-liquid separator to the inner cavity of the treatment tank in the stirring zone.

[0025] By adopting the above technical solution, the horizontal solid-liquid separator can further separate the moisture in the sediment, enabling the remaining moisture to flow back to the stirring area through the circulation and reflux assembly. The sediment after further moisture separation is conveyed to the blanking and collection bin by the screw conveyor. During the conveying process, the drying assembly further dries the sediment, making the finally collected sediment almost free of any moisture, thereby separating the sediment more thoroughly.

[0026] Optionally, the drying assembly includes a heating element, a blower, and a drying pipe. The blower is used to transfer the heat generated by the heating element into the drying pipe. The drying pipe is connected to both ends of the screw conveyor and is used to heat and dry the solid material in the screw conveyor.

[0027] By adopting the above technical solution, the blower sends the heat generated by the heating element into the drying pipe, and the heat circulates into the screw conveyor, thereby finally drying the solid material conveyed in the screw conveyor.

[0028] Optionally, the circulation and reflux assembly includes a reflux pipe and a liquid extraction pump. One end of the reflux pipe is connected to the liquid discharge end of the horizontal solid-liquid separator, and the other end is connected to the inner cavity of the treatment tank in the stirring area. The liquid extraction pump is arranged on the reflux pipe and is used to pump the liquid flowing out of the liquid discharge end of the horizontal solid-liquid separator back into the stirring area.

[0029] By adopting the above technical solution, the reflux pipe can collect the separated moisture, and the liquid extraction pump can pump the water in the reflux pipe back into the stirring area again, realizing the recycling of water.

[0030] In summary, the present application includes at least one of the following beneficial technical effects: 1. When the electroplating wastewater in the liquid storage tank enters the treatment tank through the connecting pipe, it first reaches the stirring area. At this time, the dosage adjustment mechanism will detect the concentration of metal ions in the electroplating wastewater reaching the stirring area, and then add an appropriate amount of precipitant according to the size of the metal ion concentration. At this time, the stirring mechanism stirs the electroplating wastewater in the stirring area evenly, so that the precipitant can fully combine with the metal ions in the electroplating wastewater, thereby generating precipitation and separating out. The separated precipitation will rotate in the stirring area with the stirring of the stirring mechanism, so that the precipitation is evenly distributed in the stirring area. During the rotation process, the precipitation at the bottom layer of the stirring area will enter the buffer area, and after the buffering effect of the buffer mechanism, it will reach the static area. At this time, the precipitation slowly settles and gradually stratifies in the static area, and finally forms the distribution of the upper clear liquid and the lower precipitation. At this time, the separation mechanism filters out the upper clear liquid and pushes the precipitation out of the treatment tank from the bottom of the treatment tank to realize the separation of the upper clear liquid and the lower precipitation. The separated precipitation undergoes post-treatment operations by the post-treatment mechanism and finally forms a dry solid without moisture, thereby realizing the recovery of metal ions in the electroplating wastewater; 2. The buffer seat can separate the stirring area and the static area, reducing the influence of the liquid in the stirring area on the precipitation settlement in the static area, and the lifting member can drive the buffer seat to lift; when the concentration of metal ions in the electroplating wastewater is high, the stirring area needs to provide sufficient reaction time and space to ensure the full mixing of the precipitant and metal ions. At this time, the lifting member drives the buffer seat to descend, so as to increase the volume of the stirring area, increase the contact area between the electroplating wastewater and the precipitant, and ensure more complete reaction; when the concentration of metal ions in the electroplating wastewater is low, the precipitation reaction is completed relatively quickly. Increasing the volume of the static area can provide more precipitation space, which helps the precipitation to settle more completely. At this time, by driving the buffer seat to rise through the lifting member, so as to increase the volume of the static area, the suspension of the precipitation can be reduced and the precipitation effect can be improved; 3. The design of the variable width of the buffer channel can control the flow rate of the wastewater, so that it can quickly pass through the stirring area and enter the buffer area, and can also provide an appropriate static time in the static area; by accelerating the flow rate in the middle and slowing down the flow rate at both ends, the mixing efficiency of the precipitant and the wastewater is ensured, and at the same time, sufficient residence time is provided for the precipitation of metal ions, avoiding incomplete precipitation caused by too fast flow rate; 4. Through the blocking effect of the buffer plate, a relatively static buffer area is formed between the stirring area and the static area, which helps to reduce the interference of stirring on the static area and improve the wastewater recovery efficiency; 5. When the buffer seat moves towards the static zone, the pressing rod will press the corresponding separation plate at this time, so that the separation plates will finally be coplanar. At this time, each pressing rod will drive the mounting base and each separation plate to move towards the bottom of the treatment tank. At this time, the upper clear liquid in the static zone passes through the separation holes to the upper ends of the separation plates. When the separation plate reaches the separation point between the upper clear liquid and the sediment, since all the upper clear liquid passes through the separation holes to the upper ends of the separation plates, the sediment located at the lower end of the separation plate will be pushed downward by the separation plate and finally discharged from the sludge outlet, realizing the separation of the upper clear liquid and the sediment. Moreover, this is an operation automatically realized when the buffer seat adjusts the ratio of the stirring zone to the static zone, making the whole solid-liquid separation more convenient to improve the efficiency of wastewater recycling and utilization; 6. The horizontal solid-liquid separator can further separate the water in the sediment, so that the remaining water flows back to the stirring zone through the circulation and reflux assembly, and the sediment after further separating the water is conveyed to the feeding and collecting bin by the screw conveyor. During the transmission process, the drying assembly further dries the sediment, so that the finally collected sediment contains almost no water, thereby separating the sediment more thoroughly and further improving the wastewater recycling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0032] Figure 1 It is a schematic diagram of the overall structure of a circulating recovery device for treating electroplating wastewater in this embodiment; Figure 2 is Figure 1 a partial structural schematic diagram of the treatment tank in Figure 3 is Figure 2 a structural schematic diagram inside the treatment tank in Figure 4 is Figure 3 a structural schematic diagram of the separation mechanism in

[0033] Reference numerals: 1, liquid storage tank; 11, connecting pipe; 12, first one-way valve; 2, treatment tank; 21, stirring area; 22, buffer area; 23, standing area; 3, stirring mechanism; 31, driving member; 32, rotating blade; 4, dosage adjusting mechanism; 5, buffer mechanism; 51, buffer seat; 511, buffer channel; 512, buffer plate; 5121, flow-through hole; 52, connecting rod; 53, lifting member; 6, separation mechanism; 61, mounting base; 62, separation plate; 63, elastic member; 64, pressing rod; 7, post-treatment mechanism; 71, horizontal solid-liquid separator; 72, screw conveyor; 73, return pipe; 74, liquid pumping pump; 75, heating member; 76, blower; 77, drying pipe; 78, blanking and collecting bin. Detailed implementation manners

[0034] The following Figures 1-4 is a further detailed description of the present application in conjunction with the attached drawings.

[0035] An embodiment of the present application discloses a circulating recovery device for treating electroplating wastewater.

[0036] Referring to Figure 1 and Figure 2 , a circulating recovery device for treating electroplating wastewater includes a liquid storage tank 1 and a treatment tank 2. A connecting pipe 11 is provided between the liquid storage tank 1 and the treatment tank 2. The liquid storage tank 1 contains electroplating wastewater to be treated, and a first one-way valve 12 for allowing the electroplating wastewater in the liquid storage tank 1 to flow unidirectionally into the treatment tank 2 is provided in the connecting pipe 11.

[0037] The treatment tank 2 is divided into a stirring area 21, a buffer area 22, and a standing area 23 from top to bottom in sequence. The connecting pipe 11 is communicated with the inner cavity of the stirring area 21 of the treatment tank 2. A stirring mechanism 3 for stirring the electroplating wastewater entering the stirring area 21 is provided in the stirring area 21. A dosage adjusting mechanism 4 for adjusting the addition amount of the precipitant according to the concentration of metal ions in the electroplating wastewater is provided on the treatment tank 2 where the stirring area 21 is located.

[0038] A buffer mechanism 5 for buffering the electroplating wastewater solution stirred in the stirring area 21 is provided in the buffer area 22. The buffer mechanism 5 can make the electroplating wastewater solution in the stirring area 21 stand when it reaches the standing area 23, and can adjust the area ratio of the stirring area 21 and the standing area 23 according to the concentration of metal ions in the electroplating wastewater.

[0039] A separation mechanism 6 for separating the upper clear liquid and the lower precipitate after standing is provided in the treatment tank 2 where the standing area 23 is located. When the buffer mechanism 5 moves towards the bottom of the treatment tank 2, the separation mechanism 6 separates the upper clear liquid and the lower precipitate from each other.

[0040] A sludge outlet is provided at the bottom of the treatment tank 2, and a post-treatment mechanism 7 for post-treating the flowing slurry is connected to the sludge outlet.

[0041] Referring to Figure 2 and Figure 3 , the stirring mechanism 3 includes a driving member 31 and a rotating blade 32. The driving member 31 is arranged at the top of the treatment tank 2, and the output end extends into the treatment tank 2. The rotating blade 32 is coaxially fixed on the output shaft of the driving member 31 extending into the inner cavity of the treatment tank 2.

[0042] Referring to Figure 1 and Figure 2 , the dosage adjustment mechanism 4 includes a metal ion sensor, a precipitant addition pipe, an electromagnetic valve, and a controller. The metal ion sensor is arranged in the stirring area 21 of the treatment tank 2. The precipitant addition pipe is arranged at the top of the treatment tank 2 and communicates with the stirring area 21. The precipitant addition pipe is filled with a precipitant. The electromagnetic valve is installed at the outlet end of the precipitant addition pipe. The controller is electrically connected to the metal ion sensor and the electromagnetic valve respectively.

[0043] The metal ion sensor can detect the metal ion concentration in the stirring area 21 and transmit the concentration signal to the controller. The controller controls the opening size and opening time of the electromagnetic valve according to the metal ion concentration, so that an appropriate amount of precipitant is added from the precipitant addition pipe into the stirring area 21.

[0044] Referring to Figure 2 and Figure 3 , the buffer mechanism 5 includes a buffer seat 51, a connecting rod 52, and a lifting member 53. The buffer seat 51 is slidably and sealingly arranged in the treatment tank 2. A buffer channel 511 is opened in the middle of the buffer seat 51. The inner diameter of the buffer channel 511 gradually decreases from both ends to the middle. A plurality of connecting rods 52 are provided. One end of each connecting rod 52 is fixedly connected to the upper part of the buffer seat 51. The lifting member 53 can be a hydraulic cylinder. In this embodiment, the lifting member 53 is a servo motor. The lifting member 53 is arranged at the top of the treatment tank 2. The ends of the connecting rods 52 are connected to each other. A lead screw is coaxially fixed to the end of the lifting member 53. The lead screw is threadedly connected to the connecting end of each connecting rod 52, so as to realize the lifting adjustment of the buffer seat 51.

[0045] The buffer seat 51 can separate the stirring area 21 and the static area 23, reducing the influence of the liquid in the stirring area 21 on the precipitation and static settlement in the static area 23, and the lifting member 53 can drive the buffer seat 51 to lift.

[0046] When the concentration of metal ions in the electroplating wastewater is relatively high, the stirring area 21 needs to provide sufficient reaction time and space to ensure the full mixing of the precipitant and metal ions. At this time, the lifting member 53 drives the buffer seat 51 to descend, so as to increase the volume of the stirring area 21, increase the contact area between the electroplating wastewater and the precipitant, and ensure more thorough reaction.

[0047] When the concentration of metal ions in the electroplating wastewater is low, the precipitation reaction is completed relatively quickly. Increasing the volume of the static zone 23 can provide more precipitation space, which helps the sediment to settle more thoroughly. At this time, the lifting member 53 drives the buffer seat 51 to rise, thereby increasing the volume of the static zone 23, reducing the suspension of the sediment, and improving the effect of wastewater recycling and utilization.

[0048] Furthermore, in order to form a relatively static buffer zone 22 between the stirring zone 21 and the static zone 23, further reducing the interference of stirring on the static zone 23 and improving the precipitation efficiency, referring to Figure 2 and Figure 3 , a plurality of buffer plates 512 are uniformly and spaced along the circumference on the top of the buffer seat 51. The plate surfaces of the buffer plates 512 are perpendicular to the rotation direction of the liquid in the stirring zone 21, and a plurality of flow holes 5121 are formed in each buffer plate 512.

[0049] Referring to Figure 3 and Figure 4 , the separation mechanism 6 includes a mounting base 61, a separation plate 62, a torsion spring, an elastic member 63 and a pressing rod 64. The mounting base 61 is slidably disposed on the inner wall of the treatment tank 2 where the static zone 23 is located. A plurality of separation plates 62 are provided. One end of each separation plate 62 is rotatably mounted on the mounting base 61. A plurality of torsion springs are provided corresponding to each separation plate 62. Each torsion spring is disposed on the axis of rotation of the separation plate 62 and can make the end of the corresponding separation plate 62 away from the mounting base 61 rotate towards the direction close to the bottom of the buffer seat 51.

[0050] A plurality of groups of elastic members 63 are provided. Each elastic member 63 is disposed on the inner wall of the treatment tank 2 where the static zone 23 is located, and one end is fixedly connected to the bottom of the mounting base 61, and is used to provide a force for the mounting base 61 to move towards the direction close to the buffer seat 51.

[0051] Referring to Figure 3 and Figure 4 , a plurality of pressing rods 64 are provided corresponding to each separation plate 62. One end of each pressing rod 64 is fixedly connected to the bottom of the buffer seat 51, and the other end is opposite to the upper end surface of the corresponding separation plate 62. Separation holes for only liquid to flow through are formed in each separation plate 62. When each pressing rod 64 presses the corresponding separation plate 62 to be in the same plane, the plate surfaces of each separation plate 62 divide the inner cavity of the treatment tank 2 into upper and lower parts; A second one-way valve for allowing the lower sediment precipitated in the static zone 23 to flow out unidirectionally is provided on the sludge outlet.

[0052] When the buffer seat 51 moves towards the static area 23, the pressing rod 64 will press the corresponding separation plate 62 at this time, so that the separation plates 62 are finally coplanar. At this time, each pressing rod 64 will drive the mounting base 61 and the separation plates 62 to move towards the bottom of the treatment tank 2. At this time, the supernatant in the upper layer of the static area 23 passes through the separation holes to the upper ends of the separation plates 62. When the separation plates 62 reach the separation position between the upper supernatant and the sediment, since all the upper supernatant passes through the separation holes to the upper ends of the separation plates 62, the sediment located at the lower ends of the separation plates 62 will be pushed downward by the separation plates 62 and finally discharged from the sludge outlet, realizing the separation of the upper supernatant and the sediment. And this is an operation automatically realized when the buffer seat 51 adjusts the ratio of the stirring area 21 and the static area 23, making the whole solid-liquid separation more convenient.

[0053] Refer to Figure 1 and Figure 2 As shown in FIGS. and, the post-treatment mechanism 7 includes a horizontal solid-liquid separator 71 arranged below the sludge outlet, a screw conveyor 72, a circulating reflux assembly, a drying assembly, and a blanking collection bin 78. The sludge outlet at the bottom of the treatment tank 2 is communicated with the middle inner cavity of the horizontal solid-liquid separator 71. The screw conveyor 72 is communicated with the solid discharge end of the horizontal solid-liquid separator 71. The blanking collection bin 78 is communicated with the end of the screw conveyor 72. The drying assembly is used for drying the solid material in the screw conveyor 72. The circulating reflux assembly is communicated with the liquid discharge end of the horizontal solid-liquid separator 71, and the circulating reflux assembly is used for returning the liquid separated by the horizontal solid-liquid separator 71 to the inner cavity of the treatment tank 2 in the stirring area 21.

[0054] The horizontal solid-liquid separator 71 can further separate the moisture in the sediment, so that the remaining moisture is returned to the stirring area 21 through the circulating reflux assembly. The sediment after further separating the moisture is conveyed by the screw conveyor 72 to the blanking collection bin 78. During the transmission process, the drying assembly further dries the sediment, so that the finally collected sediment contains almost no moisture, thereby separating the sediment more thoroughly and further improving the wastewater recycling efficiency.

[0055] Refer to Figure 1 and Figure 2 As shown in FIGS. and, the drying assembly includes a heating element 75, a blower 76, and a drying pipe 77. The blower 76 is used for transmitting the heat generated by the heating element 75 into the drying pipe 77. The heating element 75 uses an electric heating wire. The drying pipe 77 is communicated with both ends of the screw conveyor 72 and is used for heating and drying the solid material in the screw conveyor 72. The blower 76 sends the heat generated by the heating element 75 into the drying pipe 77, and circulates through the bolt conveyor from the drying pipe 77, thereby finally drying the solid material conveyed in the screw conveyor 72.

[0056] Refer to Figure 1 and Figure 2, the circulating reflux assembly includes a reflux pipe 73 and a liquid extraction pump 74. One end of the reflux pipe 73 is communicated with the liquid discharge end of the horizontal solid-liquid separator 71, and the other end is communicated with the inner cavity of the treatment tank 2 in the stirring area 21. The liquid extraction pump 74 is arranged on the reflux pipe 73 and is used to pump the liquid flowing out of the liquid discharge end of the horizontal solid-liquid separator 71 back into the stirring area 21. The reflux pipe 73 can collect the separated water, and the liquid extraction pump 74 can pump the water in the reflux pipe 73 back into the stirring area 21 to realize the recycling of water.

[0057] The implementation principle of the circulating recovery device for electroplating wastewater treatment in the embodiment of the present application is as follows: when the electroplating wastewater in the liquid storage tank 1 enters the treatment tank 2 through the connecting pipe 11, it first reaches the stirring area 21. At this time, the dosage adjustment mechanism 4 will detect the metal ion concentration in the electroplating wastewater reaching the stirring area 21, and then add an appropriate amount of precipitant according to the size of the metal ion concentration. At this time, the stirring mechanism 3 stirs the electroplating wastewater in the stirring area 21 evenly, so that the precipitant can fully combine with the metal ions in the electroplating wastewater, thereby generating precipitates and separating out. The separated precipitates will rotate in the stirring area 21 with the stirring of the stirring mechanism 3, so that the precipitates are evenly distributed in the stirring area 21; During the rotation process, the precipitates at the bottom layer of the stirring area 21 will enter the buffer area 22, and after the buffering action of the buffer mechanism 5, they will reach the static area 23. At this time, the precipitates will slowly settle and gradually stratify in the static area 23, and finally form a distribution of upper clear liquid and lower precipitates. At this time, the separation mechanism 6 filters the upper clear liquid and pushes the precipitates out of the treatment tank 2 from the bottom of the treatment tank 2 to realize the separation of the upper clear liquid and the lower precipitates. The separated precipitates are subjected to post-treatment operations by the post-treatment mechanism 7, and finally form dry solids without moisture, thereby realizing the recovery of metal ions in the electroplating wastewater.

[0058] The above are all optional embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A recycling device for electroplating wastewater treatment, characterized in that: It comprises a liquid storage tank and a treatment tank, a connecting pipe is arranged between the liquid storage tank and the treatment tank, the liquid storage tank is filled with electroplating wastewater to be treated, and the connecting pipe is provided with a first one-way valve for allowing the electroplating wastewater in the liquid storage tank to flow into the treatment tank in a one-way manner; The treatment tank is divided into a stirring zone, a buffer zone and a static zone from top to bottom, the connecting pipe is connected to the inner cavity of the stirring zone of the treatment tank, the stirring zone is provided with a stirring mechanism for stirring the electroplating wastewater entering the stirring zone, and the treatment tank where the stirring zone is located is provided with a dosage adjustment mechanism for adjusting the amount of precipitant added according to the concentration of metal ions in the electroplating wastewater; The buffer zone is provided with a buffer mechanism for buffering the electroplating wastewater solution stirred in the stirring zone, and the buffer mechanism can make the electroplating wastewater solution in the stirring zone stand still when it reaches the static zone, and can adjust the area size ratio of the stirring zone and the static zone according to the concentration of metal ions in the electroplating wastewater; A separation mechanism for separating the upper clear liquid and the lower sediment after standing is arranged in the processing tank where the standing area is located. When the buffer mechanism moves toward the bottom of the processing tank, the separation mechanism separates the upper clear liquid and the lower sediment from each other. A mud outlet is provided at the bottom of the processing tank, and a post-processing mechanism for post-processing the outflowing mud is connected to the mud outlet.

2. The electroplating wastewater treatment recycling device according to claim 1, characterized in that: The stirring mechanism comprises a driving member and a rotating blade. The driving member is arranged on the top of the processing tank, and the output end thereof extends into the processing tank. The rotating blade is coaxially fixed on the output shaft of the driving member extending into the inner cavity of the processing tank.

3. The electroplating wastewater treatment recycling device according to claim 1, characterized in that: The dosage adjustment mechanism includes a metal ion sensor, a precipitant addition tube, a solenoid valve and a controller. The metal ion sensor is arranged in the stirring zone of the treatment tank. The precipitant addition tube is arranged at the top of the treatment tank and is connected to the stirring zone. The precipitant addition tube is equipped with a precipitant. The solenoid valve is installed at the outlet end of the precipitant addition tube. The controller is electrically connected to the metal ion sensor and the solenoid valve respectively.

4. The recycling device for treating electroplating wastewater according to claim 1, characterized in that: The buffer mechanism includes a buffer seat, a connecting rod and a lifting member. The buffer seat is slidingly sealed and arranged in the processing tank. A buffer channel is opened in the middle of the buffer seat. A plurality of connecting rods are provided. One end of each connecting rod is fixedly connected to the upper part of the buffer seat. The lifting member is arranged at the top of the processing tank, and the lifting end is fixedly connected to the other end of each connecting rod.

5. The recycling device for treating electroplating wastewater according to claim 4, characterized in that: The inner diameter of the buffer channel gradually decreases from both ends to the middle.

6. The recycling device for treating electroplating wastewater according to claim 4, characterized in that: A plurality of buffer plates are evenly and spaced apart along the circumferential direction on the top of the buffer seat, a plate surface of each buffer plate is perpendicular to the rotation direction of the liquid in the stirring zone, and a plurality of flow holes are opened on each buffer plate.

7. The recycling device for treating electroplating wastewater according to claim 4, characterized in that: The separation mechanism includes a mounting base, a separation plate, a torsion spring, an elastic member and a pressing rod. The mounting base is slidably arranged on the inner wall of the processing tank where the static area is located. The separation plates are provided with multiple pieces, and one end of each separation plate is rotatably mounted on the mounting base. The torsion springs are provided in multiple pieces corresponding to each separation plate, and each torsion spring is arranged on the axis of rotation of the separation plate, so that the end of the corresponding separation plate away from the mounting base can be rotated in the direction close to the bottom of the buffer seat; The elastic members are provided in multiple groups, each of which is provided on the inner wall of the processing tank where the static area is located, and one end of each elastic member is fixedly connected to the bottom of the mounting base, so as to provide a force for the mounting base to move toward the buffer seat; The pressing rods are provided in plurality corresponding to the separation plates, and one end of each pressing rod is fixed to the bottom of the buffer seat, and the other end is directly opposite to the upper end surface of the corresponding separation plate. Each separation plate is provided with a separation hole for liquid circulation only. When each pressing rod presses the corresponding separation plate to be in the same plane, the plate surface of each separation plate separates the inner cavity of the processing tank into two parts, an upper part and an lower part. The mud outlet is provided with a second one-way valve for allowing the lower layer of sediment settled in the static area to flow out in one direction.

8. The recycling device for treating electroplating wastewater according to claim 1, characterized in that: The post-processing mechanism includes a horizontal solid-liquid separator, a screw conveyor, a circulation reflux component, a drying component and a material collection bin arranged below the mud outlet, the mud outlet at the bottom of the processing tank is connected to the middle inner cavity of the horizontal solid-liquid separator, the screw conveyor is connected to the solid discharge end of the horizontal solid-liquid separator, the material collection bin is connected to the end of the screw conveyor, the drying component is used to dry the solid material in the screw conveyor, the circulation reflux component is connected to the liquid discharge end of the horizontal solid-liquid separator, and the circulation reflux component is used to return the liquid separated by the horizontal solid-liquid separator to the inner cavity of the processing tank in the stirring zone.

9. The recycling device for treating electroplating wastewater according to claim 8, characterized in that: The drying component includes a heating element, a blower and a drying tube. The blower is used to transfer the heat generated by the heating element to the drying tube. The drying tube is connected to both ends of the screw conveyor and is used to heat and dry the solid material in the screw conveyor.

10. The recycling device for treating electroplating wastewater according to claim 8, characterized in that: The circulation reflux component includes a reflux pipe and a liquid pump. One end of the reflux pipe is connected to the liquid discharge end of the horizontal solid-liquid separator, and the other end is connected to the inner cavity of the treatment tank in the stirring zone. The liquid pump is arranged on the reflux pipe to pump the liquid flowing out of the liquid discharge end of the horizontal solid-liquid separator back into the stirring zone.

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