Nickel resource enrichment and recovery equipment adopting diamond anode and electrolytic film concentration synergistic effect

Abstract

The invention relates to nickel resource enrichment and recovery equipment adopting a diamond anode and electrolytic film concentration synergistic effect. The nickel resource enrichment and recovery equipment comprises a treatment tank; the first-stage concentration assembly, the second-stage concentration assembly and the third-stage concentration assembly are sequentially mounted in the treatment tank from the input end to the output end of the treatment tank; according to the invention, the three groups of concentration components are progressively mounted according to the sequence of'first-stage, second-stage and third-stage ', and are matched with the special high-pressure pump and the monitoring elements (the pressure sensor, the flow control valve and the flow meter), so that the core for realizing step-by-step enrichment of nickel ions is realized, the nickel concentration is increased by step-by-step concentration, the single-stage efficiency bottleneck is avoided, and the efficiency is improved. The low-concentration nickel-containing wastewater is primarily enriched in the first-stage concentration, the concentrated water is further concentrated in the second-stage concentration, the nickel ion concentration is finally increased to the level suitable for electrolysis through the third-stage concentration, membrane pollution or mass transfer resistance dramatic increase is easily caused by overhigh concentration of the concentrated water in the single-stage concentration, the load of each stage can be balanced through the step-by-step design, and the overall concentration efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to a nickel resource enrichment and recovery device that employs the synergistic effect of diamond anode and electrolytic membrane concentration. Background Technology

[0002] Nickel, as an important metallic resource, has wide applications in many fields. However, traditional nickel resource recycling equipment has several problems. On the one hand, the recycling efficiency is low, failing to fully extract nickel resources from various nickel-containing raw materials (such as nickel smelting slag leaching solutions and waste battery dismantling fluids), resulting in resource waste. On the other hand, energy consumption is too high, consuming a large amount of energy during the recycling process, increasing recycling costs. In addition, existing equipment may generate secondary pollution during the processing, negatively impacting the environment. For example, some equipment uses chemical precipitation to recover nickel, producing large amounts of difficult-to-treat sludge, and the use of chemical agents may also lead to water pollution.

[0003] Given the current resource shortages and increasingly stringent environmental protection requirements, developing a high-efficiency, low-consumption, and environmentally friendly nickel resource enrichment and recovery equipment is of significant practical importance. Summary of the Invention

[0004] The purpose of this invention is to provide a nickel resource enrichment and recovery device that employs the synergistic effect of diamond anode and electrolytic membrane concentration to solve the above problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a nickel resource enrichment and recovery device employing the synergistic effect of diamond anode and electrolytic membrane concentration, comprising: a treatment tank; a primary concentration component, a secondary concentration component, and a tertiary concentration component, sequentially installed in the treatment tank from the input end to the output end; the permeate produced by the primary, secondary, and tertiary concentration components all enter their respective reverse osmosis components through outlet pipes; the concentrate produced by the primary concentration component is input into the secondary concentration component through a conveying pipe; the concentrate produced by the secondary concentration component is input into the tertiary concentration component through a conveying pipe; the concentrate produced by the tertiary concentration component is conveyed into the electrolytic cell through a conveying pipe; A high-pressure pump is connected to the primary concentration unit via a delivery pipe at its output end; a first pressure sensor, a first flow control valve, and a first flow meter are sequentially installed on the delivery pipe connected to the first high-pressure pump from output end to input end; a second high-pressure pump is installed on the delivery pipe between the primary and secondary concentration units; a second pressure sensor, a second flow control valve, and a second flow meter are sequentially installed on the delivery pipe connected to the second high-pressure pump from output end to input end; a third high-pressure pump is installed on the delivery pipe between the secondary and tertiary concentration units; a third pressure sensor, a third flow control valve, and a third flow meter are sequentially installed on the delivery pipe connected to the third high-pressure pump from output end to input end.

[0006] Preferably, the reverse osmosis assembly includes a plunger pump, a pressure regulating valve, a fourth flow control valve, and a fourth flow meter, which are sequentially installed on the delivery pipe from the output end to the input end; a reverse osmosis membrane is installed inside the reverse osmosis assembly; the concentrate produced by the reverse osmosis assembly is returned to the primary concentration assembly through a return pipe; the three sets of return pipes are connected by a water pipe joint; a fifth flow control valve is installed on the return pipe; and the desalinated water produced by the reverse osmosis assembly is output through a water pipe.

[0007] Preferably, it also includes a primary electrolytic membrane, a secondary electrolytic membrane, and a tertiary electrolytic membrane, which are respectively disposed in the primary concentration module, the secondary concentration module, and the tertiary concentration module.

[0008] Preferably, the membrane materials of the primary, secondary, and tertiary electrolytic membranes are all perfluorosulfonic acid resins, wherein the primary electrolytic membrane has an ion exchange capacity of 1.2-1.5 mmol / g and a thickness of 0.1-0.15 mm, and the secondary and tertiary electrolytic membranes have an ion exchange capacity of 1.0-1.2 mmol / g and a thickness of 0.15-0.2 mm.

[0009] Preferably, the reverse osmosis membrane is a spiral wound composite reverse osmosis membrane with a membrane area of ​​30-40 m² and a desalination rate of ≥99%.

[0010] Preferably, it also includes a frequency converter, which is integrated with the motor of the high-pressure pump and fixed in the motor control box of the high-pressure pump, and is connected to the pressure sensor and the motor via a data cable.

[0011] Preferably, it also includes a PLC controller, wherein the signal input terminal of the PLC controller is connected to the signal output terminals of the pressure sensor and the flow meter respectively via data lines.

[0012] Preferably, the signal input terminal of the PLC controller is connected to the flow control valve, pressure regulating valve, frequency converter and liquid inlet valve respectively via data lines.

[0013] Preferably, it also includes an anode and a cathode, which are vertically installed on both sides inside the electrolytic cell; the anode is a boron-doped diamond-coated anode, and the cathode is a high-purity stainless steel cathode.

[0014] This invention has at least the following beneficial effects:

[0015] 1. This invention utilizes a progressive installation of three concentration components arranged in a "first-stage → second-stage → third-stage" configuration, along with a dedicated high-pressure pump and monitoring elements (pressure sensor, flow control valve, flow meter). This is the core of achieving stepwise enrichment of nickel ions. Stepwise concentration increases the nickel concentration, avoiding the bottleneck of single-stage efficiency. The first-stage concentration initially enriches the low-concentration nickel-containing wastewater, and the concentrate then enters the second stage for further concentration. Finally, the third-stage concentration raises the nickel ion concentration to a level suitable for electrolysis. Single-stage concentration is prone to membrane fouling or a sharp increase in mass transfer resistance due to excessively high concentrate concentration. The stepwise design balances the load of each stage and improves the overall concentration efficiency.

[0016] 2. This invention returns the concentrate from the three sets of reverse osmosis components to the primary concentration stage via a reflux pipe. This allows nickel ions in the reverse osmosis concentrate to be reintroduced into the concentration system, preventing nickel loss in the permeate stage and improving the overall recovery rate. Without reflux, trace amounts of nickel in the permeate would be discharged with the desalination, resulting in resource waste. The plunger pump provides the high pressure required for reverse osmosis, the pressure regulating valve adjusts the pressure difference across the membrane, and the fourth flow control valve and fourth flow meter control the flow direction of permeate and concentrate, ensuring stable desalination and avoiding membrane performance degradation caused by pressure fluctuations. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a structural module diagram of the present invention.

[0019] In the attached diagram, the following are the reference numerals: 1. Treatment tank; 2. Electrolytic cell; 3. Cathode; 4. Anode; 5. Delivery pipe; 6. Inlet valve; 7. Second high-pressure pump; 8. Second pressure sensor; 9. Second flow control valve; 10. Second flow meter; 11. Third high-pressure pump; 12. Third pressure sensor; 13. Third flow control valve; 14. Third flow meter; 15. Tertiary concentration unit; 16. Tertiary electrolytic membrane; 17. Secondary concentration unit; 18. Secondary electrolytic membrane; 19. Primary concentration unit; 20. Primary electrolytic membrane; 21. First high-pressure pump; 22. First pressure sensor; 23. First flow control valve; 24. First flow meter; 25. Reverse osmosis unit; 26. Reverse osmosis membrane; 27. Return pipe; 28. Fifth flow control valve; 29. ​​Fourth flow control valve; 30. Pressure regulating valve; 31. Plunger pump; 32. Fourth flow meter; 33. Frequency converter; 34. PLC controller. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1This invention provides a technical solution: a nickel resource enrichment and recovery device employing the synergistic effect of diamond anode and electrolytic membrane concentration, comprising a treatment tank 1, a primary concentration module 19, a secondary concentration module 17, and a tertiary concentration module 15, which are installed sequentially from the input end to the output end of the treatment tank 1. The permeate produced by the primary, secondary, and tertiary concentration modules 19, 17, and 15 enters the corresponding reverse osmosis module 25 through outlet pipes. The concentrate produced by the primary concentration module 19 is input into the secondary concentration module 17 through a conveying pipe 5. The concentrate produced by the secondary concentration module 17 is input into the tertiary concentration module 15 through a conveying pipe 5. The concentrate produced by the tertiary concentration module 15 is conveyed into the electrolytic cell 2 through a conveying pipe 5. A first high-pressure pump 21 is connected to the primary concentration module 19 via a conveying pipe 5. A first pressure sensor 22, a first flow control valve 23, and a first flow meter 24 are installed sequentially from the output end to the input end of the first high-pressure pump 21. The second high-pressure pump 7 is installed on the conveying pipe 5 between the primary concentration unit 19 and the secondary concentration unit 17. The second pressure sensor 8, the second flow control valve 9, and the second flow meter 10 are installed sequentially from the output end to the input end on the conveying pipe 5 connected to the second high-pressure pump 7. The third high-pressure pump 11 is installed on the conveying pipe 5 between the secondary concentration unit 17 and the tertiary concentration unit 15. The third pressure sensor 12, the third flow control valve 13, and the third flow meter 14 are installed sequentially from the output end to the input end on the conveying pipe 5 connected to the third high-pressure pump 11. The high-pressure pump is a 3DP250 model with a rated pressure of 2.5MPa and a rated flow rate of 2.5m³ / h. The flow material is titanium alloy, which is suitable for high-pressure feeding scenarios in electrolytic nickel processes. The pressure sensor is a Siemens QBE2003-P16 model, and its matching sensor housing model is usually a derivative code of this sensor model (such as QBE2003-P16-HS, HS). The housing component is made of 316L stainless steel to withstand corrosive environments containing nickel-containing liquids, and its rated pressure resistance is ≥0.6MPa (with a safety margin). The flow control valve is a HydraForce NV series throttle valve, such as NV10-20 or NV10-22, with a flow range of 56L / min and a maximum working pressure of 240bar, suitable for applications requiring precise throttling control. The flow meter is an Omron FD-A10C model, with a measurement range of 0.1-10L / min.

[0022] Rated pressure 1.6MPa.

[0023] The three concentration units are installed in a progressive manner, from primary to secondary to tertiary stages, and are equipped with dedicated high-pressure pumps and monitoring elements (pressure sensors, flow control valves, and flow meters). This is the core of achieving progressive nickel ion enrichment. The progressive concentration increases the nickel concentration and avoids the bottleneck of single-stage efficiency. The primary concentration first enriches the low-concentration nickel-containing wastewater, and the concentrate then enters the secondary stage for further concentration. Finally, the tertiary concentration increases the nickel ion concentration to a level suitable for electrolysis. Single-stage concentration is prone to membrane fouling or a sharp increase in mass transfer resistance due to excessively high concentrate concentration. The progressive design can balance the load of each stage and improve the overall concentration efficiency.

[0024] The high-pressure pump provides sufficient membrane filtration pressure for each stage of concentration to ensure efficient retention of nickel ions. Membrane separation requires specific pressure drive, and the high-pressure pump can match the pressure requirements of different concentration stages. For example, if the feed concentration of the first stage is low, the pressure of the first high-pressure pump 21 can be slightly lower. If the concentrate concentration of the second and third stages is high, the pressure of the second and third high-pressure pumps 11 can provide higher pressure.

[0025] The pressure sensor monitors the pressure in the delivery pipe 5 in real time to prevent overpressure from damaging the membrane module or pipeline. The flow control valve and flow meter precisely regulate the feed flow rate to prevent flow fluctuations from causing unstable concentration effect (for example, if the flow rate is too high, it will cause the membrane surface velocity to be too fast and the retention rate to decrease, while if the flow rate is too low, it will easily lead to membrane fouling).

[0026] It also includes a primary electrolytic membrane 20, a secondary electrolytic membrane 18, and a tertiary electrolytic membrane 16, which are respectively disposed in the primary concentration unit 19, the secondary concentration unit 17, and the tertiary concentration unit 15. The membrane material of the primary electrolytic membrane 20, the secondary electrolytic membrane 18, and the tertiary electrolytic membrane 16 is all perfluorosulfonic acid resin. The ion exchange capacity of the primary electrolytic membrane 20 is 1.2-1.5 mmol / g and the thickness is 0.1-0.15 mm. The ion exchange capacity of the secondary electrolytic membrane 18 and the tertiary electrolytic membrane 16 is 1.0-1.2 mmol / g and the thickness is 0.15-0.2 mm.

[0027] The spiral-wound composite reverse osmosis membrane ensures that the nickel content of the final discharged freshwater meets the standards, avoiding environmental pollution. The secondary and tertiary electrolytic membranes 16 also use cation exchange membranes, but their performance parameters are slightly different from those of the primary electrolytic membrane 20, in order to adapt to the changes in nickel ion concentration in the liquid after primary concentration and further improve the retention efficiency.

[0028] Reference Figure 1The reverse osmosis module 25 includes a plunger pump 31, a pressure regulating valve 30, a fourth flow control valve 29, and a fourth flow meter 32, which are sequentially installed on the delivery pipe 5 from the output end to the input end. A reverse osmosis membrane 26 is installed inside the reverse osmosis module 25. The reverse osmosis membrane 26 is a spiral wound composite reverse osmosis membrane with a membrane area of ​​30-40 m² and a desalination rate ≥99%. The concentrate produced by the reverse osmosis module 25 is returned to the primary concentration module 19 through a return pipe 27. The three sets of return pipes 27 are connected by water pipe joints. A fifth flow control valve 28 is installed on the return pipe 27. The desalination produced by the reverse osmosis module 25 is output through a water pipe. The plunger pump 31 is a CNP CDL32-12. Model number 30, rated pressure 2.8MPa, rated flow 19m³ / h, suitable for low-pressure RO systems, is a high-performance domestic option. The pressure regulating valve 30 is the SPIRAXSARCO 25P model, with an adjustment range of 0.5-3.0MPa. The valve body is made of 316L material, and the adjustment accuracy is ±0.03MPa, which can meet the requirements of high-precision pressure control.

[0029] The concentrate from the three sets of reverse osmosis components 25 is returned to the primary concentration via the return pipe 27. This allows nickel ions in the reverse osmosis concentrate to be reintroduced into the concentration system, preventing nickel loss in the permeate stage and improving the overall recovery rate. Without return, trace amounts of nickel in the permeate would be discharged with the fresh water, resulting in resource waste. The plunger pump 31 provides the high pressure required for reverse osmosis, the pressure regulating valve 30 adjusts the pressure difference across the membrane, and the fourth flow control valve 29 and the fourth flow meter 32 control the flow direction of permeate and concentrate to ensure stable desalination and avoid membrane performance degradation caused by pressure fluctuations.

[0030] Reference Figures 1-2 It also includes a frequency converter 33, which is integrated with the motor of the high-pressure pump and fixed in the motor control box of the high-pressure pump. It is connected to the pressure sensor and the motor via a data cable. When the pressure sensor detects that the pressure exceeds the specified range, it transmits the signal to the PLC controller 34. The PLC controller 34 immediately transmits the electrical signal to the frequency converter 33. The frequency converter 33 quickly adjusts the speed of the high-pressure pump by changing the power supply frequency of the motor, thereby realizing real-time pressure control. The signal input terminal of the PLC controller 34 is connected to the signal output terminal of the pressure sensor and the flow meter via a data cable. The signal input terminal of the PLC controller 34 is also connected to the flow control valve, the pressure regulating valve 30, the frequency converter 33, and the inlet valve 6 via a data cable.

[0031] The signal input terminal connects to all pressure sensors and flow meters to collect real-time operating data (such as primary concentration pressure and reverse osmosis flow rate). The signal output terminal connects to all flow control valves, pressure regulating valves 30, frequency converters 33, and inlet valves 6, and can automatically execute adjustment commands (such as when the flow meter shows that the flow rate is too low, the PLC controls the first flow control valve 23 to open wider; when the reverse osmosis desalination rate decreases, the PLC adjusts the pressure regulating valve 30 to increase the pressure). No manual real-time monitoring is required, reducing the difficulty of operation and avoiding the decrease in concentration efficiency or equipment failure caused by human error.

[0032] Reference Figure 1 It also includes an anode 4 and a cathode 3, which are vertically installed on both sides inside the electrolytic cell 2. The anode 4 is a boron-doped diamond-coated anode, and the cathode 3 is a high-purity stainless steel cathode. The concentrated water produced by the electrolytic membrane enters the electrolytic cell and passes through the diamond anode 4. It has advantages such as high oxygen evolution potential, low background current, high chemical stability and low adsorption characteristics. In the electrolytic cell 2, the concentrated water undergoes an electrolytic reaction under the action of direct current. Nickel ions gain electrons at the cathode 3 and are reduced to metallic nickel, while anions undergo an oxidation reaction at the anode 4.

[0033] Working Principle: During operation, the PLC controller 34 starts the first high-pressure pump 21. Nickel-containing wastewater enters the first-stage concentration module 19 through the delivery pipe 5. The first pressure sensor 22 and the first flow meter 24 collect pressure and flow data in real time. If the pressure is too high, the PLC reduces the frequency of the first high-pressure pump 21 through the frequency converter 33, or controls the first flow control valve 23 to reduce its opening to ensure stable operation of the first-stage concentration. The first-stage electrolytic membrane 20 in the first-stage concentration module 19 retains nickel ions, and the generated permeate enters the corresponding reverse osmosis module 25 through the outlet pipe. The generated concentrate flows to the second-stage concentration module 17 through the delivery pipe 5. Then, the PLC starts the second high-pressure pump 7 to pressurize the first-stage concentrate and send it to the second-stage concentration module 17. The second pressure sensor 8 and the second flow meter 10 monitor the operating parameters, and the second flow control valve 9 adjusts the flow to ensure that the pressure of the second-stage concentration is suitable for the high-concentration concentrate. The second-stage electrolytic membrane 18 further retains nickel ions, and the generated permeate enters the corresponding reverse osmosis module 25 to produce... The concentrate flows through the delivery pipe 5 to the tertiary concentration unit 15. Then, the PLC starts the third high-pressure pump 11 to pressurize the secondary concentrate and send it into the tertiary concentration unit 15. The third pressure sensor 12 and the third flow meter 14 monitor the parameters, and the third flow control valve 13 adjusts the flow rate. The tertiary concentration pressure is controlled at the highest level to meet the membrane separation requirements of high-concentration concentrate. The tertiary electrolytic membrane 16 finally retains nickel ions, and the generated permeate enters the corresponding reverse osmosis unit 25. The generated concentrate meets the requirements for electrolytic enrichment and is sent to the electrolytic cell 2 through the delivery pipe 5. The PLC controls the electrolysis system to be powered on, and an electric field is formed between the anode 4 and the cathode 3. Nickel ions gain electrons on the surface of the cathode 3, are reduced to metallic nickel, and are deposited. The anode 4 mainly undergoes the oxygen evolution reaction. Because the diamond anode 4 has a high oxygen evolution overpotential and few side reactions, nickel ion deposition is prioritized. After a certain deposition time (adjusted according to the concentrate concentration, usually 4-6 hours), the electrolysis system is shut down, the metallic nickel layer on the surface of the cathode 3 is stripped off, and the enrichment and recovery of nickel resources is completed.

[0034] After the permeate from each stage of concentration enters the corresponding reverse osmosis module 25, the PLC starts the plunger pump 31 to provide high pressure, the pressure regulating valve 30 adjusts the membrane pressure difference, the reverse osmosis membrane 26 intercepts trace nickel ions in the permeate, and the generated fresh water is discharged directly through the water pipe to meet the standards. The concentrate produced by reverse osmosis (containing trace nickel ions) is collected through the return pipe 27, and the PLC controls the fifth flow control valve 28 to adjust the return ratio and send the concentrate back to the first stage concentration module 19 to re-participate in the concentration process.

[0035] Throughout the process, the PLC controller 34 continuously collects signals from all pressure sensors and flow meters. If any abnormality occurs (such as a sudden increase in the third-stage pressure or a sudden drop in the reverse osmosis flow), it immediately triggers adjustment commands (such as closing the inlet valve 6 or reducing the frequency of the high-pressure pump) to ensure the safe and continuous operation of the equipment.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nickel resource enrichment and recovery device employing the synergistic effect of diamond anode and electrolytic membrane concentration, characterized in that, include: Processing tank (1); The primary concentration unit (19), the secondary concentration unit (17) and the tertiary concentration unit (15) are installed in the processing tank (1) from the input end to the output end; The permeate produced by the primary concentration unit (19), the secondary concentration unit (17) and the tertiary concentration unit (15) all enter the corresponding reverse osmosis unit (25) through the outlet pipe. The concentrated water produced by the primary concentration unit (19) is fed into the secondary concentration unit (17) through the delivery pipe (5); The concentrated water produced by the secondary concentration unit (17) is fed into the tertiary concentration unit (15) through the delivery pipe (5); The concentrated water produced by the three-stage concentration unit (15) is transported to the electrolytic cell (2) through the delivery pipe (5); The first high-pressure pump (21) is connected to the first-stage concentration unit (19) via a delivery pipe (5) at its output end; The first pressure sensor (22), the first flow control valve (23), and the first flow meter (24) are installed sequentially from the output end to the input end on the delivery pipe (5) connected to the first high-pressure pump (21); The second high-pressure pump (7) is installed on the delivery pipe (5) between the primary concentration unit (19) and the secondary concentration unit (17); The second pressure sensor (8), the second flow control valve (9), and the second flow meter (10) are installed sequentially from the output end to the input end on the delivery pipe (5) connected to the second high-pressure pump (7); The third high-pressure pump (11) is installed on the delivery pipe (5) between the secondary concentration unit (17) and the tertiary concentration unit (15); The third pressure sensor (12), the third flow control valve (13), and the third flow meter (14) are installed sequentially from the output end to the input end on the delivery pipe (5) connected to the third high-pressure pump (11).

2. The nickel resource enrichment and recovery equipment according to claim 1, which employs the synergistic effect of diamond anode and electrolytic membrane concentration, is characterized in that: The reverse osmosis assembly (25) includes a plunger pump (31), a pressure regulating valve (30), a fourth flow control valve (29), and a fourth flow meter (32), which are installed sequentially on the delivery pipe from the output end to the input end; A reverse osmosis membrane (26) is installed inside the reverse osmosis assembly (25); The concentrate produced by the reverse osmosis unit (25) is returned to the primary concentration unit (19) through the return pipe (27); The three sets of return pipes (27) are connected by water pipe joints; The fifth flow control valve (28) is installed on the return pipe (27); The fresh water produced by the reverse osmosis component (25) is output through a water pipe.

3. The nickel resource enrichment and recovery equipment according to claim 1, which employs the synergistic effect of diamond anode and electrolytic membrane concentration, is characterized in that: It also includes a primary electrolytic membrane (20), a secondary electrolytic membrane (18) and a tertiary electrolytic membrane (16), which are respectively installed in the primary concentration module (19), the secondary concentration module (17) and the tertiary concentration module (15).

4. The nickel resource enrichment and recovery equipment according to claim 3, which employs the synergistic effect of diamond anode and electrolytic membrane concentration, is characterized in that: The membrane materials of the primary electrolytic membrane (20), the secondary electrolytic membrane (18) and the tertiary electrolytic membrane (16) are all perfluorosulfonic acid resin. The primary electrolytic membrane (20) has an ion exchange capacity of 1.2-1.5 mmol / g and a thickness of 0.1-0.15 mm. The secondary electrolytic membrane (18) and the tertiary electrolytic membrane (16) have an ion exchange capacity of 1.0-1.2 mmol / g and a thickness of 0.15-0.2 mm.

5. A nickel resource enrichment and recovery device using the synergistic effect of diamond anode and electrolytic membrane concentration as described in claim 2, characterized in that: The reverse osmosis membrane (26) is a spiral wound composite reverse osmosis membrane with a membrane area of ​​30-40 m² and a desalination rate of ≥99%.

6. A nickel resource enrichment and recovery device according to claim 1, employing the synergistic effect of diamond anode and electrolytic membrane concentration, characterized in that: It also includes a frequency converter (33), which is integrated with the motor of the high-pressure pump and fixed in the motor control box of the high-pressure pump. It is connected to the pressure sensor and the motor via a data cable.

7. A nickel resource enrichment and recovery device according to claim 1, employing the synergistic effect of diamond anode and electrolytic membrane concentration, characterized in that: It also includes a PLC controller (34), whose signal input terminal is connected to the signal output terminal of the pressure sensor and the flow meter respectively via a data line.

8. A nickel resource enrichment and recovery device using the synergistic effect of diamond anode and electrolytic membrane concentration as described in claim 7, characterized in that: The signal input terminal of the PLC controller (34) is connected to the flow control valve, pressure regulating valve (30), frequency converter (33) and liquid inlet valve (6) respectively via data lines.

9. A nickel resource enrichment and recovery device according to claim 1, employing the synergistic effect of diamond anode and electrolytic membrane concentration, characterized in that: It also includes an anode (4) and a cathode (3), which are vertically installed on both sides inside the electrolytic cell (2); The anode (4) is a boron-doped diamond-coated anode, and the cathode (3) is a high-purity stainless steel cathode.

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