System for preparing nickel plate from nickel-containing electroplating wastewater

Abstract

The utility model discloses a system for preparing a nickel plate from nickel-containing electroplating wastewater, which belongs to the field of nickel-containing electroplating wastewater and electrodeposition metallurgy and comprises a raw water barrel, a settling barrel, a plate-and-frame filter press, a pretreatment tank, a circulating tank and an electrodeposition tank. The raw water barrel, the precipitation barrel and the plate-and-frame filter press are sequentially connected through a pipeline, a filter cake obtained through filter pressing of the plate-and-frame filter press enters the pretreatment tank, the circulation tank is connected with the pretreatment tank and the electrodeposition tank, and electrolyte of the electrodeposition tank can flow back into the precipitation barrel; after nickel-containing wastewater is precipitated through sodium hydroxide in a precipitation barrel, mud cakes are formed through a plate-and-frame filter press and sent to a pretreatment tank, the mud cakes react with sulfuric acid to generate a nickel sulfate solution, the nickel sulfate solution enters an electrodeposition tank after the concentration of the nickel sulfate solution is stabilized through a circulating tank, an anode plate and a cathode plate in the electrodeposition tank are powered by a rectifier, an anode produces oxygen, and a cathode deposits nickel; the circulating control of the circulating tank, the electrodeposition tank and the pretreatment tank ensures the stable and efficient reaction, and finally the high-purity nickel plate is prepared.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of nickel-containing electroplating wastewater and electrowinning metallurgy technology, specifically relates to a kind of nickel-containing electroplating wastewater nickel plate preparation system. BACKGROUND

[0002] With the rapid development of modern industry, electroplating industry is thriving, and becomes the important cornerstone of many high-end manufacturing fields. But behind its bright, the treatment dilemma of nickel-containing electroplating wastewater is increasingly highlighted. In electroplating production, a large number of nickel salts are used to ensure the corrosion resistance, beauty and other characteristics of the product, which makes nickel-containing electroplating wastewater continuously produced.

[0003] Traditional treatment means often only focuses on making the concentration of nickel ions meet the discharge standard, such as chemical precipitation method, by adding alkali to promote the precipitation of nickel ions, which seems to separate nickel, but in fact, the precipitation is mixed with a large amount of impurities, and the difficulty of subsequent purification to make nickel plate is beyond imagination, and the cost is also high enough to make people speechless. Ion exchange method can adsorb nickel ions, but the resin regeneration is complex, and the concentration of desorption solution is unstable, so it is also difficult to realize efficient preparation of nickel plate. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a kind of nickel-containing electroplating wastewater nickel plate preparation system, to traditional nickel-containing electroplating wastewater treatment means such as chemical precipitation method, ion exchange method, only focus on standard discharge, the former precipitated impurities are difficult to purify and high in cost, and the latter resin regeneration is complex and desorption concentration is unstable, so it is difficult to efficiently prepare nickel plate.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of nickel-containing electroplating wastewater nickel plate preparation system, including raw water bucket, sedimentation barrel, plate and frame filter press, pre-treatment tank, circulating tank and electrodeposition tank;

[0006] The raw water bucket, the sedimentation barrel and the plate and frame filter press are connected in sequence by pipeline, the filter cake filtered out by the plate and frame filter press enters the pre-treatment tank, the circulating tank is connected with the pre-treatment tank and the electrodeposition tank respectively, and the electrolyte of the electrodeposition tank can flow back to the sedimentation barrel;

[0007] The sedimentation barrel and the circulating tank add sodium hydroxide by sodium hydroxide dosing device, and the pre-treatment tank adds sulfuric acid by sulfuric acid dosing device.

[0008] Further, a raw water pump is arranged on the connecting pipeline between the sedimentation barrel and the raw water bucket, the raw water bucket is connected with the wastewater inlet of the sedimentation barrel by pipeline, the sodium hydroxide solution inlet of the sedimentation barrel is connected with the sodium hydroxide dosing device by pipeline, a sedimentation barrel stirrer is arranged on the sedimentation barrel, and a filter press liquid inlet pump is arranged between the plate and frame filter press and the sedimentation barrel.

[0009] Further, the plate-and-frame filter press liquid outlet is connected with the liquid inlet of the clear liquid collecting tank through a pipeline, and the filter cake formed by the plate-and-frame filter press is sent into the pretreatment tank through the sludge inlet of the pretreatment tank.

[0010] Further, the clear liquid inside the clear liquid collecting tank is discharged through the clear liquid outlet and the clear liquid discharge pump.

[0011] Further, the pretreatment tank is injected with clean water from the water inlet, the acid inlet of the pretreatment tank is connected with the sulfuric acid feeding device through a pipeline, and the pretreatment tank is provided with a pretreatment tank stirrer.

[0012] Further, the pretreatment tank is provided with a pretreatment tank liquid outlet pump and a pretreatment tank backflow pump between the pretreatment tank and the circulation tank.

[0013] Further, the circulation tank is injected with clean water from the water inlet, the sodium hydroxide solution inlet of the circulation tank is connected with the sodium hydroxide feeding device, and the circulation tank is provided with a circulation tank stirrer.

[0014] Further, the circulation tank is provided with a circulation tank liquid outlet pump and a circulation tank backflow pump between the circulation tank and the electrodeposition tank.

[0015] Further, the electrodeposition tank is provided with a plurality of electrode plates, the electrode plates are divided into anode plates and cathode plates, the number of anode plates is one more than the number of cathode plates, and the anode plates and the cathode plates are suspended in the electrodeposition tank in a staggered manner.

[0016] Further, the electrode plates are in contact with the electrolyte in the electrodeposition tank, and the anode plates and the cathode plates are connected with the anode and the cathode of the rectifier through wires, respectively.

[0017] Compared with the prior art, the plate-and-frame filter press liquid outlet is connected with the liquid inlet of the clear liquid collecting tank through a pipeline, and the filter cake formed by the plate-and-frame filter press is sent into the pretreatment tank through the sludge inlet of the pretreatment tank.

[0018] The nickel-containing electroplating wastewater nickel plate preparation system, after the nickel-containing wastewater is precipitated by sodium hydroxide in the precipitation barrel, the mud cake formed by the plate-and-frame filter press is sent to the pretreatment tank, and the nickel sulfate solution is generated by reacting with sulfuric acid, and after the concentration is stabilized in the circulation tank, it is sent into the electrodeposition tank. The anode plate and the cathode plate in the electrodeposition tank are powered by the rectifier, the anode produces oxygen, the cathode deposits nickel, the circulation control of the circulation tank, the electrodeposition tank and the pretreatment tank ensures stable and efficient reaction, and finally high-purity nickel plate is prepared.

[0019] The nickel plate preparation system of the nickel-containing electroplating wastewater is stable in operation, the adverse effects of large fluctuations of solution concentration on electrodeposition process are avoided, and the efficiency and quality of the prepared nickel plate are ensured. In addition, the two circulation modes are complementary to each other, the internal circulation stabilizes the concentration of the electrodeposition tank to ensure stable nickel deposition, the external circulation can supplement the high-concentration solution in time when the concentration is reduced, the reaction of the pretreatment tank is effectively utilized, the nickel recovery rate is improved, the resource waste is reduced, the dependence on new raw materials is reduced, and the economy and environmental protection of the system are improved as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A nickel plate preparation system of nickel-containing electroplating wastewater is shown in the figure.

[0021] In the figure: 1, raw water bucket; 2, raw water pump; 3, sedimentation tank; 3-1, wastewater inlet; 3-2, sodium hydroxide solution inlet of the sedimentation tank; 3-3, sedimentation tank stirrer; 4, filter press liquid inlet pump; 5, plate and frame filter press; 6, clear liquid collection tank; 7, clear liquid discharge pump; 8, pretreatment tank; 8-1, water inlet of the pretreatment tank; 8-2, mud inlet of the pretreatment tank; 8-3, acid inlet of the pretreatment tank; 8-4, pretreatment tank stirrer; 9, pretreatment tank liquid outlet pump; 10, pretreatment tank backflow pump; 11, circulation tank; 11-1, water inlet of the circulation tank; 11-2, sodium hydroxide solution inlet of the circulation tank; 11-3, circulation tank stirrer; 12, circulation tank backflow pump; 13, electrolyte backflow pump; 14, electrolyte liquid inlet pump; 15, electrodeposition tank; 15-1, anode plate; 15-2, cathode plate; 15-3, rectifier; 16, sodium hydroxide dosing device; 17, sulfuric acid dosing device; 18-1, dosing bucket; 18-2, stirrer; 18-3, mechanical diaphragm metering pump. DETAILED DESCRIPTION

[0022] The utility model will be further described below in combination with examples.

[0023] The following examples are used to illustrate the utility model, but cannot be used to limit the protection scope of the utility model. The conditions in the examples can be further adjusted according to specific conditions, and simple improvements of the method of the utility model under the concept of the utility model all belong to the range required to be protected by the utility model.

[0024] Please refer to Figure 1 The utility model provides a kind of nickel plate preparation system of nickel-containing electroplating wastewater, including raw water bucket 1, sedimentation tank 3, plate and frame filter press 5, pretreatment tank 8, circulation tank 11 and electrodeposition tank 15;

[0025] The raw water bucket 1, the sedimentation barrel 3 and the plate-and-frame filter press 5 are connected in sequence through pipelines, the filter cake of the plate-and-frame filter press 5 is conveyed into the pre-treatment tank 8, and the circulating tank 11 is connected with the pre-treatment tank 8 and the electrodeposition tank 15 through two pipelines respectively; the electrolyte of the electrodeposition tank 15 can flow back to the sedimentation barrel 3.

[0026] The connecting pipeline between the sedimentation barrel 3 and the raw water bucket 1 is provided with the raw water pump 2, the raw water bucket 1 is connected with the waste water inlet 3-1 of the sedimentation barrel 3 through a pipeline, the sedimentation barrel sodium hydroxide solution inlet 3-2 arranged on the sedimentation barrel 3 is connected with the sodium hydroxide dosing device 16 through a pipeline, the sedimentation barrel agitator 3-3 is arranged on the sedimentation barrel 3, and the plate-and-frame filter press 5 is provided with the filter press liquid inlet pump 4.

[0027] The raw water bucket 1 collects and temporarily stores the nickel-containing waste water generated by the electroplating production line, and the sedimentation barrel 3 receives the nickel-containing waste water as a reaction container; when starting to work, the raw water pump 2 sends the nickel-containing waste water in the raw water bucket 1 into the sedimentation barrel 3, and after reaching a certain liquid level, the sodium hydroxide solution is conveyed to the sedimentation barrel 3, the sodium hydroxide reacts with the nickel-containing waste water to generate nickel hydroxide precipitate; in order to prevent the precipitate from accumulating in the sedimentation barrel 3 and being unable to be discharged, the sedimentation barrel agitator 3-3 is started to stir the work, so that the precipitate is suspended in the liquid, and the reaction of sodium hydroxide and the nickel-containing waste water is promoted. When the nickel-containing waste water and the sodium hydroxide are completely reacted, the filter press liquid inlet pump 4 sends the liquid containing the precipitate to the plate-and-frame filter press 5; the sedimentation barrel agitator 3-3 is fixed on the sedimentation barrel 3, and stirs the liquid in the sedimentation barrel 3 during the reaction work of the sedimentation barrel 3, so as to prevent the precipitation and promote the reaction.

[0028] The filter press liquid outlet of the plate-and-frame filter press 5 is connected with the liquid inlet 6-1 of the clear liquid collecting tank 6 through a pipeline, and the filter cake formed by the plate-and-frame filter press 5 is introduced into the pre-treatment tank 8 through the mud inlet 8-2 of the pre-treatment tank 8.

[0029] The plate-and-frame filter press 5 receives the liquid containing the precipitate conveyed by the filter press liquid inlet pump 4, filters and retains the precipitate through the filter pressing effect, forms the nickel hydroxide mud cake, and discharges the filter pressing liquid to the clear liquid collecting tank 6 from the filter press liquid outlet, and the nickel hydroxide mud cake falls into the pre-treatment tank 8.

[0030] The clear liquid in the clear liquid collecting tank 6 is discharged through the clear liquid outlet 6-2 and the clear liquid discharge pump 7; the clear liquid collecting tank 6 temporarily stores the clear liquid discharged by the plate-and-frame filter press 5, and the clear liquid discharge pump 7 conveys the clear liquid in the clear liquid collecting tank 6 to the downstream, which can be discharged after being detected to be qualified.

[0031] The front treatment tank inlet 8-1 of the front treatment tank 8 can inject clean water into the interior, the front treatment tank acid inlet 8-3 of the front treatment tank 8 is connected with the sulfuric acid feeding device 17 through a pipeline, and the front treatment tank 8 is provided with a front treatment tank stirrer 8-4; the front treatment tank outlet pump 9 and the front treatment tank reflux pump 10 are arranged between the front treatment tank 8 and the circulation tank 11.

[0032] The main function of the front treatment tank 8 is to dissolve the nickel hydroxide mud cake entering the tank, when the amount of the nickel hydroxide mud cake is sufficient, sufficient water enters from the front treatment tank water inlet 8-1, and the front treatment tank stirrer 8-4 is used for stirring, at the same time, the sulfuric acid solution enters from the front treatment tank acid inlet 8-3, the sulfuric acid solution reacts with the nickel hydroxide mud cake to generate a nickel sulfate solution. The generated nickel sulfate solution is sent into the circulation tank 11 through the front treatment tank outlet pump 9, when the concentration of the nickel sulfate in the circulation tank 11 decreases, the front treatment tank reflux pump 10 is started to perform reflux, the solution refluxing into the front treatment tank 8 continues to dissolve the nickel hydroxide, in this way, the fresh water consumption and the sulfuric acid consumption of the system can be reduced as much as possible, and the concentration of the nickel sulfate in the circulation tank 8 can be kept stable; the front treatment tank stirrer 8-4 is fixed on the front treatment tank 8, and the liquid in the stirring barrel is stirred when the front treatment tank stirrer 8-4 works, so that the reaction of the sulfuric acid and the nickel hydroxide mud cake is promoted, and the working period is shortened; the function of the front treatment tank outlet pump 9 is to transport the nickel sulfate solution in the front treatment tank 8 to the circulation tank 11.

[0033] The function of the front treatment tank reflux pump 10 is to transport the low-concentration nickel sulfate solution from the circulation tank 11 to the front treatment tank 8

[0034] The circulation tank water inlet 11-1 of the circulation tank 11 can inject clean water into the interior, the circulation tank sodium hydroxide solution inlet 11-2 of the circulation tank 11 is connected with the sodium hydroxide feeding device 16 through a pipeline, the circulation tank 11 is provided with a circulation tank stirrer 11-3, and the circulation tank outlet pump 14 and the circulation tank reflux pump 12 are arranged between the circulation tank 11 and the electrodeposition tank 15.

[0035] The circulation tank 11 is located between the electrodeposition tank 15 and the front treatment tank 8, and plays a role of transfer, buffering and adjusting, and can establish two circulation modes. The first circulation mode is an internal circulation mode: circulation of the nickel sulfate solution between the electrodeposition tank 15 and the circulation tank 11. The internal circulation mode working process is as follows: the high-concentration nickel sulfate solution transported from the front treatment tank 8 is stored in the circulation tank 11, when the electrodeposition tank 15 works, the nickel sulfate solution in the circulation tank 11 and the electrodeposition tank 15 is circulated through the electrolyte inlet pump 14 and the circulation tank reflux pump 12, so that the concentration of the nickel sulfate solution in the electrodeposition tank 15 is kept stable.

[0036] The second circulation mode is external circulation mode: circulation of nickel sulfate solution between the pretreatment tank 8 and the circulation tank 11. When the concentration of nickel sulfate in the electrodeposition tank 15 and the circulation tank 11 is reduced to a certain value, the pretreatment tank backflow pump 10 is started to discharge the low-concentration nickel sulfate in the circulation tank 11 to the pretreatment tank 8, and the pretreatment tank 8 repeats the previous working process to obtain high-concentration nickel sulfate solution which is then sent to the circulation tank 11 by the pretreatment tank outlet pump 9. The high-concentration nickel sulfate solution obtained in the circulation tank 11 is then continuously sent to the electrodeposition tank 15 by the electrolyte inlet pump 14 to start the internal circulation mode.

[0037] The electrolyte backflow pump 13 is arranged between the electrodeposition tank 15 and the precipitation barrel 3. The electrodeposition tank 15 has a plurality of electrode plates, which are divided into anode plates 15-1 and cathode plates 15-2. The number of anode plates is one more than that of cathode plates. The anode plates 15-1 and the cathode plates 15-2 are suspended in the electrodeposition tank 15 and are in contact with the electrolyte in the electrodeposition tank 15. The anode plates 15-1 and the cathode plates 15-2 are connected to the anode and the cathode of the rectifier 15-3 through wires, respectively. The rectifier 15-3 is externally connected to a conventional alternating current to provide stable direct current to the anode plates 15-1 and the cathode plates 15-2. The anode plates 15-1 are made of titanium steel plates with a thickness of 2-5 mm and are coated with iridium oxide on the surface. The cathode plates 15-2 are made of nickel plates. When the electrodeposition tank is working, the electrolyte inlet pump 14 transports the nickel sulfate solution from the circulation tank 11 to the electrodeposition tank 15. After the rectifier is powered on, oxidation reaction occurs on the anode plates 15-1, and oxygen is generated on the anode: 2H2O→O 2 +4H + +4e - On the cathode plates 15-2, the reaction of metal nickel deposition occurs, and its reaction formula can be represented as: Ni 2+ +2e - →Ni. The nickel deposited on the cathode plates 15-2 eventually forms thick nickel plates with a purity of more than 99.9%, which can be sold as commodities.

[0038] The rectifier 15-3 is fixed on the electrodeposition tank 15 and can convert alternating current into direct current that can be used for electrodeposition work, and can adjust voltage and current parameters.

[0039] The sodium hydroxide dosing device 16 and the sulfuric acid dosing device 17 each include a dosing barrel 18-1, a stirrer 18-2, and a mechanical diaphragm metering pump 18-3, which can dissolve solid sodium hydroxide or sulfuric acid and quantitatively deliver them to the corresponding device.

[0040] The working principle and use flow of the utility model are: when starting to work, the raw water pump 2 sends the nickel-containing wastewater in the raw water bucket 1 into the sedimentation barrel 3, after reaching a certain liquid level, the sodium hydroxide solution is delivered to the sedimentation barrel 3, the sodium hydroxide reacts with the nickel-containing wastewater, nickel hydroxide precipitate is produced, in order to prevent the precipitate from accumulating in the sedimentation barrel 3 and being unable to be discharged, the sedimentation barrel stirrer 3-3 starts stirring work, so that the precipitate is suspended in the liquid, and the reaction of sodium hydroxide and the nickel-containing wastewater is promoted. When the nickel-containing wastewater and sodium hydroxide are completely reacted, the filter press liquid inlet pump 4 sends the liquid containing the precipitate to the plate-and-frame filter press 5.

[0041] The plate-and-frame filter press 5 receives the liquid containing the precipitate delivered by the filter press liquid inlet pump 4, through the filter pressing effect, the precipitate is filtered and retained, nickel hydroxide mud cake is formed, the filter liquor is discharged from the filter press liquid outlet to the clear liquid collecting tank 6, and the nickel hydroxide mud cake falls into the pre-treatment tank 8.

[0042] The pre-treatment tank 8 mainly functions to dissolve the nickel hydroxide mud cake entering the tank, when the amount of nickel hydroxide mud cake is sufficient, sufficient water is introduced from the pre-treatment tank water inlet 8-1, and stirring is carried out by the pre-treatment tank stirrer 8-4, at the same time, sulfuric acid solution is introduced from the pre-treatment tank acid inlet 8-3, the sulfuric acid solution reacts with the nickel hydroxide mud cake to generate nickel sulfate solution. The generated nickel sulfate solution is sent into the circulating tank 11 by the pre-treatment tank liquid outlet pump 9, when the concentration of nickel sulfate in the circulating tank 11 decreases, the pre-treatment tank reflux pump 10 is opened to carry out reflux, the solution refluxed into the pre-treatment tank 8 continues to dissolve nickel hydroxide, in this way, the fresh water consumption and sulfuric acid consumption of the system can be reduced as much as possible, and the concentration of nickel sulfate in the circulating tank 8 can be kept stable.

[0043] The high-concentration nickel sulfate solution delivered from the pre-treatment tank 8 is stored in the circulating tank 11, when the electrodeposition tank 15 works, the nickel sulfate solution in the circulating tank 11 and the electrodeposition tank 15 is circulated by the electrolyte liquid inlet pump 14 and the circulating tank reflux pump 12, so that the concentration of the nickel sulfate solution in the electrodeposition tank 15 is kept stable.

[0044] When the electrodeposition tank works, the electrolyte liquid inlet pump 14 delivers the nickel sulfate solution from the circulating tank 11 to the electrodeposition tank 15, after the rectifier is powered on, oxidation reaction occurs on the anode plate 15-1, oxygen is generated on the anode, and metal nickel deposition reaction occurs on the cathode plate 15-2. The nickel deposited on the cathode plate 15-2 eventually forms a relatively thick nickel plate with a purity of more than 99.9%.

[0045] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A system for producing nickel plates from nickel-containing electroplating wastewater, characterized in that: It comprises raw water bucket (1), sedimentation barrel (3), plate and frame filter press (5), pre-treatment tank (8), circulating tank (11) and electrodeposition tank (15); The raw water bucket (1), the sedimentation barrel (3) and the plate and frame filter press (5) are sequentially connected by pipelines, the filter cake filtered by the plate and frame filter press (5) enters the pre-treatment tank (8), the circulating tank (11) is connected with the pre-treatment tank (8) and the electrodeposition tank (15) respectively, and the electrolyte in the electrodeposition tank (15) can flow back to the sedimentation barrel (3). The sedimentation barrel (3) and the circulating tank (11) add sodium hydroxide through the sodium hydroxide adding device (16), and the pre-treatment tank (8) adds sulfuric acid through the sulfuric acid adding device (17).

2. The nickel plate preparation system for nickel-containing electroplating wastewater according to claim 1, characterized in that: The connecting pipeline between the sedimentation barrel (3) and the raw water bucket (1) is provided with a raw water pump (2), the raw water bucket (1) is connected with the waste water inlet (3-1) of the sedimentation barrel (3) through a pipeline, the sedimentation barrel sodium hydroxide solution inlet (3-2) provided on the sedimentation barrel (3) is connected with the sodium hydroxide adding device (16) through a pipeline, the sedimentation barrel (3) is provided with a sedimentation barrel stirrer (3-3), and the plate and frame filter press (5) and the sedimentation barrel (3) are provided with a filter press liquid inlet pump (4).

3. The nickel plate preparation system for nickel-containing electroplating wastewater according to claim 1, characterized in that: The liquid outlet of the plate and frame filter press (5) is connected with the liquid inlet (6-1) of the clear liquid collecting tank (6) through a pipeline, and the filter cake formed by the plate and frame filter press (5) enters the pre-treatment tank (8) through the mud inlet (8-2) of the pre-treatment tank (8).

4. The nickel plate preparation system for nickel-containing electroplating wastewater according to claim 3, characterized in that: The internal clear liquid of the clear liquid collecting tank (6) is discharged through the clear liquid outlet (6-2) and the clear liquid discharge pump (7).

5. The nickel plate preparation system for nickel electroplating wastewater according to claim 1, characterized in that: Clean water is injected into the pre-treatment tank (8) from the water inlet (8-1) of the pre-treatment tank, the acid inlet (8-3) of the pre-treatment tank (8) is connected with the sulfuric acid adding device (17) through a pipeline, and the pre-treatment tank (8) is provided with a pre-treatment tank stirrer (8-4).

6. The nickel plate preparation system for nickel electroplating wastewater according to claim 1, characterized in that: The pre-treatment tank (8) is provided with a pre-treatment tank liquid outlet pump (9) and a pre-treatment tank backflow pump (10) between the backflow and the circulating tank (11).

7. The nickel plate preparation system for nickel electroplating wastewater according to claim 1, characterized in that: Clean water is injected into the circulating tank (11) from the water inlet (11-1) of the circulating tank, the sodium hydroxide solution inlet (11-2) of the circulating tank (11) is connected with the sodium hydroxide adding device (16), and the circulating tank (11) is provided with a circulating tank stirrer (11-3).

8. The nickel plate preparation system for nickel electroplating wastewater according to claim 1, characterized in that: The circulating tank (11) is provided with a circulating tank liquid outlet pump (14) and a circulating tank backflow pump (12) between the circulating tank (11) and the electrodeposition tank (15).

9. The nickel plate preparation system for nickel electroplating wastewater according to claim 1, characterized in that: The electrodeposition tank (15) has a plurality of electrode plates, the electrode plates are divided into anode plates (15-1) and cathode plates (15-2), the number of the anode plates is one more than that of the cathode plates, and the anode plates (15-1) and the cathode plates (15-2) are suspended in the electrodeposition tank (15) and cross each other.

10. The nickel plate preparation system for nickel electroplating wastewater according to claim 9, characterized in that: The electrode plates are in contact with the electrolyte in the electrodeposition tank (15), and the anode plates (15-1) and the cathode plates (15-2) are connected with the anode and the cathode of the rectifier (15-3) through wires, respectively.

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