Nickel-containing wastewater electrolysis recovery equipment

Abstract

The invention relates to the technical field of heavy metal ion treatment, and particularly discloses nickel-containing wastewater electrolysis recovery equipment which comprises an electrolytic bath, a cathode plate and an anode plate, an electrode plate rotating stand is rotationally arranged above a through opening of the electrolytic bath, the electrode plate rotating stand is in a regular polygon column shape, and each side face of the electrode plate rotating stand is provided with a rectangular groove concaved inwards; a row of polar plate clamping seats are arranged on the sliding rail in the rectangular groove at equal intervals, a fork type telescopic frame fixedly connected in the middle is arranged in the rectangular groove, one end of the fork type telescopic frame is connected with a telescopic driving part fixedly arranged, and the fork type telescopic frame is connected with the polar plate clamping seats; the nickel-containing wastewater electrolytic recovery equipment disclosed by the invention can adjust the distance between the cathode plate and the anode plate on line, so that the distance between the cathode plate and the anode plate can be always kept in an optimal range, on one hand, the nickel-containing wastewater can be efficiently electrolyzed and recovered, and on the other hand, the short circuit condition caused by too short distance of the electrode plates is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of heavy metal ion treatment, and specifically discloses a nickel-containing wastewater electrolysis recovery device. Background Art

[0002] Traditionally, there are four main methods for treating nickel-containing wastewater: chemical precipitation, ion exchange, activated carbon adsorption, and membrane filtration. Among them, the chemical precipitation method will produce secondary sewage, the ion exchange method and activated carbon adsorption method require the use of a large amount of exchange resin and activated carbon, resulting in excessively high treatment costs, and the membrane filtration method requires frequent cleaning or replacement of the filter membrane during operation. In addition, none of the above four treatment methods can directly convert nickel ions in wastewater into nickel metal, and subsequent corresponding chemical reaction treatment is required to achieve the recovery of nickel metal.

[0003] The invention patent with application number 200910154766.4 discloses a method for electrolytic treatment of nickel-containing electroplating wastewater and recovery of nickel. The method is carried out by using an electrolytic treatment device for nickel-containing electroplating wastewater. The electrolytic treatment device for nickel-containing electroplating wastewater includes an electrolytic cell and an electrolyte stirring device. The electrolytic cell adopts a glass electrolytic cell, and the anode and the cathode are arranged alternately in a monopolar parallel manner. An exhaust port and a feed port are provided at the top of the electrolytic cell, a valve is provided on the feed port, and a discharge port is provided at the bottom of the electrolytic cell, and a valve is provided on the discharge port. The anode adopts a titanium-based platinum electrode, and the cathode adopts a nickel electrode or a graphite electrode. The patent discloses a method for recovering nickel metal from electroplating nickel-containing wastewater by electrolysis, and the nickel metal can be directly precipitated and settled on the anode by electrolysis. Compared with the treatment of traditional nickel-containing wastewater, the nickel metal can be directly recovered, avoiding secondary pollution. However, due to the design deficiencies of the electrolytic treatment device for nickel-containing electroplating wastewater, there are still some deficiencies in the actual recovery process of nickel-containing wastewater. First, since the distance between the anode and cathode in the device is fixed, as the electrolysis process proceeds, the precipitated nickel metal will adhere to the cathode surface, making the distance between the anode and cathode gradually smaller, which is easy to cause the problem of short circuit of the plate. Therefore, the electrode needs to be replaced after a period of electrolysis, resulting in frequent replacement of the electrode; second, when the anode and cathode in the device are replaced, not only do they need to be taken out of the electrolytic cell, but the circuit needs to be reconnected after replacing the new plate, resulting in a long replacement time for the plate, and it is impossible to achieve continuous and efficient recovery and treatment of nickel-containing wastewater, and there is a risk of electric shock during the replacement of the plate, and the safety hazard is too high. Based on this, the present application proposes a nickel-containing wastewater electrolysis recovery device that can effectively solve the above technical problems. Summary of the invention

[0004] The present invention aims to provide a nickel-containing wastewater electrolysis recovery device to solve the problems of frequent replacement of electrodes, affecting the electrolysis recovery efficiency, and electrode short circuit easily occurring due to the gradual decrease of electrode spacing in the process of recovering nickel from nickel-containing electroplating wastewater in the existing electrolytic cell.

[0005] The present invention is achieved through the following technical solutions: A nickel-containing wastewater electrolysis recovery device, comprising an electrolytic cell, a cathode plate and an anode plate, wherein a horizontal column is fixed above the opening of the electrolytic cell, an electrode plate rotating frame is rotatably arranged in the horizontal column, and a driving component for driving the electrode plate rotating frame to rotate is arranged on the electrolytic cell, the electrode plate rotating frame is in the shape of a regular polygonal column and each side surface is provided with an inwardly concave rectangular groove, a row of electrode plate holders are evenly spaced on the slide rail inside the rectangular groove, a fork-type telescopic frame fixedly connected in the middle is arranged in the rectangular groove, and one end of the fork-type telescopic frame is connected to a fixedly arranged telescopic driving member, and the convex shaft of each hinge point of the fork-type telescopic frame is connected to the electrode plate holder; A positive copper bar and a negative copper bar are respectively arranged on both sides of the bottom of the rectangular groove, and the positive copper bar and the negative copper bar are both connected with an arc-shaped copper sheet extending into the interior of the electrode plate rotating frame and arranged concentrically with the horizontal column. A conductive ring body that interacts with the two arc-shaped copper sheets is arranged on the horizontal column, and the two conductive ring bodies are respectively connected to the positive and negative electrodes of the power supply through wires. The cathode plate and the anode plate are respectively inserted in a row of electrode plate holders in an alternating manner, and a carbon brush assembly is arranged at the lower end of the electrode plate holder, and the carbon brush assembly at the lower end of the electrode plate holder on which the cathode plate is inserted contacts with the negative copper bar, and the carbon brush assembly at the lower end of the electrode plate holder on which the anode plate is inserted contacts with the positive copper bar.

[0006] The nickel-containing wastewater electrolysis recovery equipment disclosed in the present invention uses an electrode plate rotating rack as a carrier for cathode plates and anode plates. During the electrolysis recovery process of nickel-containing wastewater, the electrode plate rotating rack can be rotated to a certain angle through a driving component, thereby switching different groups of cathode plates and anode plates to extend into the electrolytic cell for operation, thereby realizing rapid switching of cathode plates and anode plates.

[0007] At the same time, when the cathode plate and the anode plate electrolyze the nickel-containing wastewater, the nickel ions in the wastewater are precipitated in the form of nickel element and attached to the cathode plate, so that the distance between adjacent cathode plates and anode plates is continuously reduced. Therefore, after each electrolysis operation for a period of time, the telescopic drive member in the lowest rectangular groove is started to retract, so that the fork-type telescopic frame is synchronously extended to both sides with the middle as the fixed point, so that the distance between adjacent plate holders is continuously expanded, so that the distance between adjacent cathode plates and anode plates is always maintained within the optimal range, thereby ensuring the electrolysis effect of the nickel-containing wastewater and avoiding the situation where the distance between the anode and cathode plates is too short to cause an electrode short circuit.

[0008] When the spacing between adjacent electrode plate holders reaches the maximum and cannot be adjusted, and the distance between adjacent cathode plates and anode plates is less than the set value, the drive assembly is started to rotate the electrode plate rotating frame, thereby rotating the group of cathode plates and anode plates out of the electrolytic cell, and subsequently a new group of cathode plates and anode plates are immersed in the nickel-containing wastewater for normal electrolysis treatment. After that, the operator replaces the new cathode plate and performs surface treatment on the anode plate, which can be used as a spare electrolysis electrode for the nickel-containing wastewater, and the removed cathode plate can be directly recycled as nickel metal.

[0009] As a further configuration of the above solution, the pole plate holder includes an insulating shell, a conductive strip is arranged in the insulating shell, and the carbon brush assembly is connected to the lower end of the conductive strip.

[0010] As a further arrangement of the above scheme, elastic clamping edges extend upward on both sides of the upper end of the insulating shell, a fastening bolt is arranged between the two elastic clamping edges, the conductive clip is U-shaped and corresponding protrusions are arranged inwardly on the upper ends of both sides, and grooves matching the protrusions are provided on the cathode plate and the anode plate.

[0011] As a further configuration of the above scheme, the carbon brush assembly includes a column shell, in which a carbon brush block extending out from the lower end is connected via a spring, and the carbon brush block is connected to the conductive card strip via a conductive wire.

[0012] As a further configuration of the above scheme, the conductive ring body is composed of a large arc at the lower end and a small arc at the upper end, a gap is maintained between the arc-shaped copper sheet and the small arc segment of the conductive ring body, and the arc-shaped copper sheet and the large arc segment of the conductive ring body are in contact with each other.

[0013] The above is a specific design scheme of the plate holder. When assembling the cathode plate and the anode plate, they are directly inserted from the center of the upper opening of the insulating shell, so that the lower end of the plate extends into the conductive card strip to achieve full contact and conduction, and then the two elastic clamps are clamped and fixed by fastening bolts. At the same time, because the conductive card strip is in contact with the corresponding positive copper strip and negative copper strip respectively through the carbon brush assembly, and then the positive copper strip and the negative copper strip are in contact with the conductive ring body through the arc copper sheet, the overall connection of the electrolytic circuit is achieved. In addition, due to the special shape design of the conductive ring body, it can be ensured that only the lowest group of cathode plates and anode plates are electrolytically recovered after contacting the electrolyte, while the other cathode plates and anode plates are in a power-off state, making the replacement process of the cathode plates and anode plates safer and faster.

[0014] As a further configuration of the above scheme, a transparent glass plate aligned with a group of cathode plates and anode plates below is arranged on the side of the electrolytic cell, and a camera facing the outside of the transparent glass plate is arranged, and the camera is electrically connected to a control box.

[0015] As a further configuration of the above scheme, a mounting frame is provided on the outer side of the electrolytic cell, a moving block is provided in the mounting frame and is moved along the arrangement direction of the cathode plates and the anode plates, the camera is provided in the moving block, a screw transmission mechanism is provided in the mounting frame, and a screw nut block that acts on the screw transmission mechanism is provided on the moving block.

[0016] The above is a further development design of the present invention. The camera moves along the length direction of the transparent glass plate. During the movement, the camera captures the image between the cathode plate and the anode plate to determine the distance between the plates. The control module inside the control box then makes corresponding control instructions, thereby realizing automatic control and adjustment, making the entire device more intelligent.

[0017] As a further configuration of the above scheme, end plates are provided at both ends of the upper surface of the electrolytic cell, the horizontal column is fixed between the two end plates, the driving assembly includes a rotating motor arranged on the end plate, and a driving gear is provided on the motor shaft of the rotating motor, and hollow end shafts rotatably connected to the horizontal column are provided at both ends of the electrode plate rotating frame, and a driven gear meshing with the driving gear is provided on the hollow end shaft.

[0018] As a further configuration of the above scheme, a pH value detection sensor and a titration cylinder with a control valve are provided on the electrolytic cell, and the pH value detection sensor is electrically connected to a control box.

[0019] As a further configuration of the above scheme, the pH value detection sensor and the titration cylinder are respectively arranged at two diagonal corners of the electrolytic cell, and a stirring mechanism is arranged at the bottom of the electrolytic cell.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The nickel-containing wastewater electrolysis recovery equipment disclosed in the present invention uses an electrode plate rotating rack as an electrode plate carrier, and switches different electrode plates through the rotation of the electrode plate rotating rack to immerse in the nickel-containing wastewater to electrolytically recover nickel ions, so that when a large amount of nickel element is precipitated on the surface of the cathode plate and needs to be replaced, it can be quickly switched, so that the electrolysis process in the electrolytic cell can be carried out continuously, thereby improving the electrolysis recovery efficiency of the nickel-containing wastewater.

[0021] The present invention arranges a row of electrode plate holders for inserting electrode plates in the rectangular grooves on each side of the electrode plate rotating frame, and then the row of electrode plate holders can be expanded equidistantly through the design of the fork-type telescopic frame and the telescopic driving member. Therefore, when nickel single substance is continuously precipitated on the surface of the electrode plate, resulting in the continuous decrease in the distance between the electrode plates, which may cause a short circuit, the distance between the positive and negative electrode plates can be adjusted online, so that the distance between the positive and negative electrode plates can always be maintained within the optimal range. On the one hand, it ensures that nickel-containing wastewater can be efficiently electrolyzed and recovered, and on the other hand, it avoids the occurrence of a short circuit caused by the electrode plates being too close.

[0022] In the process of being able to expand and move at equal intervals, the plate holder in the present invention enables a row of anode plates to be connected to the positive circuit in parallel, and a row of cathode plates to be connected to the negative circuit in parallel through the contact between the carbon brush assembly on the plate holder and the corresponding positive or negative copper strip, and then the electrolysis circuit is connected through the contact between the arc-shaped copper sheet and the conductive ring body, thereby successfully completing the electrolysis recovery of nickel-containing wastewater. In addition, the conductive ring body is designed to be composed of a large arc at the lower end and a small arc at the upper end, so that only a group of cathode plates and anode plates at the lower end are in a powered-on state, while other cathode plates and anode plates are in a powered-off state, making the replacement process of the cathode plates and anode plates safer.

[0023] The present invention further arranges an industrial camera to perform online detection of the distance between the anode and cathode plates. When it is found that the distance between the anode and cathode plates is less than the set value, the distance between the anode and cathode plates can be automatically adjusted, thereby realizing automatic control and adjustment of the entire equipment, making the entire equipment more intelligent and having a better use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the electrolytic cell, the electrode plate rotating frame, etc. in the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the electrolytic cell, horizontal column, stirring mechanism, etc. in the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the electrode plate rotating frame, rectangular groove, electrode plate holder, etc. in the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the rectangular slot, the plate holder, the cathode plate, the anode plate, etc. in the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the rectangular slot, telescopic drive member, fork-type telescopic frame, etc. in the present invention; Figure 7 It is a three-dimensional structural schematic diagram of the fork-type telescopic frame and the pole plate holder in the present invention; Figure 8 It is a schematic diagram of the internal structure of the plate holder when assembling with the cathode plate or the anode plate in the present invention; Fig. 9 It is a schematic diagram of the partial internal planar structure of the conductive card strip and the carbon brush assembly in the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the mounting frame, camera, screw transmission mechanism, etc. in the present invention. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 10 , and describes the application in detail with reference to embodiments. Example 1

[0028] Example 1 discloses a nickel-containing wastewater electrolysis recovery device, see the attached Figure 1 and attached Figure 2 The main body of the device includes an electrolytic cell 1, a sealing cover 2 and a control box 3. The control box 3 is arranged on the outer side of the electrolytic cell 1, and a corresponding control module is integrated therein. A through hole is opened on the upper surface of the electrolytic cell 1, and then an electrode plate rotating rack 4 is rotatably arranged in the through hole. The sealing cover 2 is then arranged on the upper surface of the electrolytic cell 1 so that the electrode plate rotating rack 4 is located inside it, and the side panels around the sealing cover 2 can be opened to facilitate corresponding operations.

[0029] Reference Figure 3, the electrolytic cell 1 is provided with a pH value detection sensor 101 and a burette 102 with a control valve. The pH value of the nickel-containing wastewater is detected online by the pH value detection sensor 101 and fed back to the control module, and then the control module actively opens the control valve on the burette 102, so that the pH value adjustment liquid in the burette 102 is added to the electrolytic cell 1, thereby controlling the pH value of the nickel-containing wastewater to always be maintained between 5.0 and 8.0. Through the effective control of the pH value of the nickel-containing wastewater, on the one hand, it is avoided that the pH value is too low to hinder the precipitation of nickel element, and on the other hand, it is avoided that the pH value is too high to generate nickel hydroxide precipitate. In addition, in order to ensure that the pH value of the nickel-containing wastewater detected is the accurate value of the nickel-containing wastewater in the entire electrolytic cell, the burette 102 and the pH value detection sensor 101 are respectively arranged at two diagonal positions of the electrolytic cell 1. Then a stirring mechanism 103 is also arranged in the electrolytic cell 1. The specific stirring mechanism includes a transmission belt horizontally arranged at the bottom of the electrolytic cell 1, and a plurality of water-deflecting plates are arranged at intervals on the outer surface of the transmission belt, which is then driven by a corresponding stirring motor, so that after the pH adjusting liquid is added to the electrolytic cell 1, it can be quickly and comprehensively mixed with the internal nickel-containing wastewater to avoid the situation where the pH value of the nickel-containing wastewater has large local differences.

[0030] End plates 5 are fixed at both ends of the upper surface of the electrolytic cell 1, and a horizontal column 6 is fixedly arranged between the two end plates 5 and located just above the through hole, and then the electrode plate rotating frame 4 is rotated and arranged on the horizontal column 6. Figure 2 and attached Figure 4 The electrode plate rotating frame 4 is in the shape of a regular polygonal column, and a hollow end shaft 401 rotatably connected to the horizontal column 6 is arranged at the center of its two end faces, a driven gear 402 is arranged on one of the hollow end shafts 401, and then a rotating motor 501 with a self-locking function is arranged on the corresponding end plate 5, and a driving gear 502 meshing with the driven gear 402 is arranged on the motor shaft of the rotating motor 501, so that the electrode plate rotating frame 4 can be accurately rotated according to the set angle under the action of the rotating motor 501.

[0031] Reference Figures 4 to 7, a rectangular groove 403 concave inward is provided on each side of the electrode plate rotating frame 4, a slide rail 404 is provided on the bottom wall or one side wall of the rectangular groove 403, and then a row of plate holders 7 arranged at equal intervals are slidably provided on the slide rail 404. At the same time, a fork-type telescopic frame 405 is provided in the rectangular groove 403, and the middle position of the fork-type telescopic frame 405 is fixedly connected to the side wall of the rectangular groove 403, and then the end of the fork-type telescopic frame 405 is connected to a telescopic driving member 406 fixed to the end of the rectangular groove 403, and finally the convex shaft of each hinge point of the fork-type telescopic frame 405 is connected to the plate holder 7, so that under the action of the telescopic driving member 406, the fork-type telescopic frame 405 can be controlled to synchronously extend or shorten to both sides with the middle as the fixed point, so that a row of plate holders 7 are close to or away from each other, thereby achieving the effect of adjusting the spacing.

[0032] Reference Figure 8 and attached Fig. 9 The plate holder 7 includes an insulating shell 701 with an upper opening, and elastic clamping edges 702 are extended upward on both sides of the upper end of the insulating shell 701, and fastening bolts 703 are arranged at the ends of the two elastic clamping edges 702. A U-shaped conductive clip 704 is arranged inside the insulating shell 701, and corresponding protrusions are arranged inwardly on both sides of the upper ends of the conductive clip 704, and a carbon brush assembly 705 extending out of the insulating shell 701 is arranged on one side of the lower end of the conductive clip 704, and the carbon brush assemblies 705 in two adjacent plate holders 7 are staggered on both sides.

[0033] Cathode plates 8 and anode plates 9 are alternately inserted in a row of plate holders 7, wherein the cathode plates 8 are nickel electrodes, and no special requirements are made on the material of the anode 3. The thickness of the cathode plates 8 and the anode plates 9 should be slightly smaller than the distance between the two elastic clamping edges 702, and the width should be slightly larger than the opening width of the elastic clamping edges 702, and grooves adapted to the protrusions are provided at corresponding positions, so that after the cathode plates 8 and the anode plates 9 are inserted into the corresponding plate holders 7, their grooves can interact with the protrusions on the conductive clamping strips 704, and then they are clamped and fixed in the plate holders 7 by the action of the fastening bolts 703. Finally, positive copper strips 407 and negative copper strips 408 are respectively arranged on both sides of the bottom wall of the rectangular groove 403, so that the carbon brush assembly 705 at the lower end of the row of plate holders 7 with the cathode plates 8 inserted can contact the negative copper strips 408 to achieve circuit connection, and the carbon brush assembly 705 at the lower end of the row of plate holders 7 with the anode plates 9 inserted can contact the positive copper strips 407 to achieve circuit connection. In addition, in order to ensure that the carbon brush assembly 705 can always contact the positive copper strips 407 or the negative copper strips 408 during the movement of the plate holder 7, the carbon brush assembly 705 in this embodiment includes a column shell 7051 connected to the lower end of the conductive card strip 704, and a carbon brush block 7052 extending from the lower end is connected to the column shell 7051 through a spring 7053, and then a conductive wire is arranged between the upper end of the carbon brush block 7052 and the conductive card strip 704. The design of the carbon brush assembly 705 enables the carbon brush block 7052 to always maintain good contact with the positive copper strip 407 or the negative copper strip 408 under the action of the spring 7053 .

[0034] Final reference Figure 3 and attached Figure 6 , arc-shaped copper sheets 409 extending into the electrode plate rotating frame 4 are arranged at opposite ends of the positive copper strip 407 and the negative copper strip 408, and the two arc-shaped copper sheets 409 are arranged concentrically with the horizontal column 6, and then conductive ring bodies 601 in contact with the arc-shaped copper sheets 409 are arranged at both ends of the horizontal column 6, and the two conductive ring bodies 601 are respectively connected to the positive and negative electrodes of the power supply through wires. In addition, the shape of the conductive ring body 601 is composed of a large arc at the lower end and a small arc at the upper end, so that the two arc-shaped copper sheets 409 in the rectangular groove 403 at the lower end can contact the conductive ring body 601 to be energized, while the two arc-shaped copper sheets 409 in the upper rectangular groove 403 are kept at a certain distance from the conductive ring body 601 to ensure the power-off state.

[0035] During the operation of the nickel-containing wastewater electrolysis recovery equipment disclosed in this embodiment 1, the pretreated nickel-containing wastewater is introduced into the electrolytic cell 1, and the pH value of the nickel-containing wastewater is detected online by the pH value detection sensor 101, and then the burette 102 drips alkali solution into the electrolytic cell 1 to control its pH value to always be maintained between 5.0 and 8.0.

[0036] Then, the cathode plates 8 and anode plates 9 are inserted in a row of plate holders 7 in the rectangular grooves 403 in an interlaced manner for fixing. After the cathode plates 8 and anode plates 9 are inserted, the conductive strips 704 inside the plate holders 7 are in contact with the corresponding cathode plates 8 or anode plates 9. The lower ends of the conductive strips 704 corresponding to the cathode plates 8 in the same row are in contact with the negative copper strips 408 through the carbon brush assembly 705; similarly, the lower ends of the conductive strips 704 corresponding to the anode plates 9 in the same row are in contact with the positive copper strips 407 through the carbon brush assembly 705, and at this time, the spacing between the plate holders 7 in a row is in the minimum state, so that the spacing between adjacent cathode plates 8 or anode plates 9 is maintained at about 10 mm.

[0037] Then, the electrode plate rotating frame 4 is rotated by a certain angle under the action of the rotating motor 501 and the gear meshing, and the row of cathode plates 8 and anode plates 9 are rotated to the lowest end, so that about 2 / 3 of the row of cathode plates 8 and anode plates 9 are immersed in the nickel-containing wastewater of the electrolytic cell 1. At the same time, when the cathode plates 8 and anode plates 9 rotate to the lowest end, the corresponding negative copper strips 408 and positive copper strips 407 are respectively in contact with the lower ends of the conductive ring bodies 601 at both ends, so that the direct current processed by the rectifier is respectively passed into the negative copper strips 408 and the positive copper strips 407, and then passed into the cathode plates 8 and anode plates 9 through a series of conduction actions, and then the nickel ions are precipitated in the form of nickel element and attached to the cathode plates 8 under the electrolysis of the cathode plates 8 and anode plates 9. As the electrolysis process proceeds, the thickness of the cathode plate 8 will gradually increase. At this time, the telescopic drive member 406 causes the fork-type telescopic frame 405 to extend to both sides with the middle as the fixed point, so that the spacing between a row of plate holders 7 gradually increases and maintains the same speed as the increase in the thickness of the cathode plate 8, so that the spacing between the cathode plate 8 and the anode plate 9 is always maintained at about 10 mm, thereby achieving the best electrolysis effect on nickel-containing wastewater.

[0038] When the spacing between a row of plate holders 7 changes to the maximum and cannot be further increased, and the spacing between the cathode plate 8 and the anode plate 9 is less than 8 mm, the rotating motor 501 is started to rotate the electrode plate rotating frame 4 to a certain angle so that the group of cathode plates 8 and anode plates 9 are rotated out of the electrolytic cell 1, and a new group of cathode plates 8 and anode plates 9 downstream replace them and enter the nickel-containing wastewater to continue electrolysis. After the group of cathode plates 8 and anode plates 9 are rotated out of the electrolytic cell 1, the arc-shaped copper sheet 409 maintains a certain interval with the conductive ring body 601, so that the circuit is disconnected, and then the operator can directly take out the cathode plate 8 from the plate holder 7, and then replace it with a new cathode plate 8 for the next electrolysis. Example 2

[0039] Example 2 discloses a nickel-containing wastewater electrolysis recovery device that is further designed based on the technical solution in Example 1, and the similarities between it and Example 1 are not described again.

[0040] Reference Figure 3 and attached Fig.10 In this embodiment 2, a transparent glass plate 104 is provided on one side of the electrolytic cell 1 and is aligned with a group of cathode plates 8 and anode plates 9 below, so that the nickel deposition on the surface of the cathode plate 8 in the electrolytic cell 1 can be observed through the transparent glass plate 104.

[0041] A horizontally arranged mounting frame 10 is fixed on the electrolytic cell 1 outside the transparent glass plate 104, a moving block 11 is slidably arranged in a horizontal limit opening on the outer side of the mounting frame 10, and then a camera 12 arranged toward the transparent glass plate 104 is installed in the moving block 11, and the camera 12 is electrically connected to the control module inside the control box 3. At the same time, a screw transmission mechanism 13 is also provided at the upper end of the mounting frame 10, and a screw nut block 14 that acts on the screw transmission mechanism 13 is provided at the upper end of the moving block 11, so that the moving block 11 can move horizontally along the length direction of the transparent glass plate 104 under the action of the screw transmission mechanism 13, and then a group of cathode plates 8 and anode plates 9 in the electrolytic cell 1 are photographed and captured by the camera 12 during the movement, and the image processing module inside the control box 3 determines the minimum spacing between two adjacent cathode plates 8 and anode plates 9, and then compares it with the set value. When the captured minimum spacing is less than the set value, the control box 3 will control the telescopic drive member 406 at the lower end to retract, and then under the action of the fork telescopic frame 405, the row of cathode plates 8 and anode plates 9 below are synchronously expanded and moved, thereby adjusting the spacing between the cathode plates 8 and the anode plates 9 within a safe distance, on the one hand to ensure the best electrolysis effect, and on the other hand to avoid the short circuit of the plates caused by the two being too close.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A nickel-containing wastewater electrolysis recovery device, comprising an electrolytic cell, a cathode plate and an anode plate, characterized in that: A horizontal column is fixed above the opening of the electrolytic cell, an electrode plate rotating rack is rotatably arranged in the horizontal column, and a driving assembly for driving the electrode plate rotating rack to rotate is arranged on the electrolytic cell, the electrode plate rotating rack is in the shape of a regular polygonal column and each side surface is provided with an inwardly recessed rectangular groove, a row of electrode plate holders are evenly spaced on the slide rail inside the rectangular groove, a fork-type telescopic frame fixedly connected in the middle is arranged in the rectangular groove, and one end of the fork-type telescopic frame is connected to a fixedly arranged telescopic driving member, and the convex shaft of each hinge point of the fork-type telescopic frame is connected to the electrode plate holder; A positive copper bar and a negative copper bar are respectively arranged on both sides of the bottom of the rectangular groove, and the positive copper bar and the negative copper bar are both connected with an arc-shaped copper sheet extending into the interior of the electrode plate rotating frame and arranged concentrically with the horizontal column. A conductive ring body that interacts with the two arc-shaped copper sheets is arranged on the horizontal column, and the two conductive ring bodies are respectively connected to the positive and negative electrodes of the power supply through wires. The cathode plate and the anode plate are respectively inserted in a row of electrode plate holders in an alternating manner, and a carbon brush assembly is arranged at the lower end of the electrode plate holder, and the carbon brush assembly at the lower end of the electrode plate holder on which the cathode plate is inserted contacts with the negative copper bar, and the carbon brush assembly at the lower end of the electrode plate holder on which the anode plate is inserted contacts with the positive copper bar.

2. The nickel-containing wastewater electrolysis recovery equipment according to claim 1, characterized in that: The pole plate holder comprises an insulating shell, a conductive strip is arranged in the insulating shell, and the carbon brush assembly is connected to the lower end of the conductive strip.

3. The nickel-containing wastewater electrolysis recovery equipment according to claim 2, characterized in that: Elastic clamping edges extend upward on both sides of the upper end of the insulating shell, and a fastening bolt is arranged between the two elastic clamping edges. The conductive clip is U-shaped and corresponding protrusions are arranged inwardly at the upper ends of both sides. The cathode plate and the anode plate are provided with grooves that are compatible with the protrusions.

4. The nickel-containing wastewater electrolysis recovery equipment according to claim 2, characterized in that: The carbon brush assembly comprises a column shell, in which a carbon brush block extending out from the lower end is connected via a spring, and the carbon brush block is connected to a conductive card strip via a conductive wire.

5. The nickel-containing wastewater electrolysis recovery equipment according to claim 1, characterized in that: The conductive ring body is composed of a large arc at the lower end and a small arc at the upper end. The arc-shaped copper sheet and the small arc segment of the conductive ring body are spaced apart, and the arc-shaped copper sheet and the large arc segment of the conductive ring body are in contact with each other.

6. The nickel-containing wastewater electrolysis recovery equipment according to claim 1, characterized in that: A transparent glass plate aligned with a group of cathode plates and anode plates below is arranged on the side of the electrolytic cell, and a camera facing the outside of the transparent glass plate is arranged, and the camera is electrically connected to a control box.

7. The nickel-containing wastewater electrolysis recovery equipment according to claim 6, characterized in that: A mounting frame is provided on the outer side of the electrolytic cell, a movable block is provided in the mounting frame and is movable along the arrangement direction of the cathode plates and the anode plates, the camera is arranged in the movable block, a screw transmission mechanism is provided in the mounting frame, and a screw nut block that acts on the screw transmission mechanism is provided on the movable block.

8. The nickel-containing wastewater electrolysis recovery equipment according to claim 1, characterized in that: End plates are provided at both ends of the upper surface of the electrolytic cell, the horizontal column is fixed between the two end plates, the driving assembly includes a rotating motor arranged on the end plate, and a driving gear is provided on the motor shaft of the rotating motor, and hollow end shafts rotatably connected to the horizontal column are provided at both ends of the electrode plate rotating frame, and a driven gear meshing with the driving gear is provided on the hollow end shaft.

9. The nickel-containing wastewater electrolysis recovery equipment according to claim 1, characterized in that: The electrolytic cell is provided with a pH value detection sensor and a titration cylinder with a control valve, and the pH value detection sensor is electrically connected to a control box.

10. The nickel-containing wastewater electrolysis recovery equipment according to claim 9, characterized in that: The pH value detection sensor and the titration cylinder are respectively arranged at two diagonal positions of the electrolytic cell, and a stirring mechanism is arranged at the bottom of the electrolytic cell.

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