A method and device for efficiently recovering nickel ions from electroplating wastewater

Abstract

The present invention relates to the technical field of electroplating wastewater recycling, and specifically discloses a method and device for efficiently recycling nickel ions in electroplating wastewater, including adsorption and purification: treating nickel-containing electroplating wastewater by using a dynamic continuous adsorption method with resin, and stopping the adsorption process when the nickel ion concentration at the outlet reaches saturation; regeneration and concentration: regenerating the resin in a dynamic continuous manner by configuring a hydrochloric acid solution with a preset concentration, and stopping the regeneration when the regenerated liquid reaches a predetermined volume; oxalic acid precipitation: configuring an oxalic acid solution with a preset concentration and stirring and reacting it with the regenerated nickel-containing concentrated solution to obtain a precipitate. The method for efficiently recycling nickel ions proposed in the present invention can achieve the enrichment of nickel ions with slightly lower concentrations in electroplating wastewater, integrating the methods of ion exchange adsorption and chemical precipitation. The overall treatment process is simple and easy to implement, and the industrial equipment is well-matched. After fine control of the treatment process, the efficient recycling of nickel ion resources can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electroplating wastewater recycling, and particularly to a method and device for efficiently recycling nickel ions in electroplating wastewater. Background Art

[0002] A large amount of heavy metals contained in electroplating wastewater enter the water body, posing a threat to the environment and also resulting in waste and loss of heavy metal resources.

[0003] Nickel is a heavy metal toxic pollutant. By using appropriate treatment technologies for electroplating nickel wastewater, not only can nickel metal be effectively recycled, but also relatively high-standard water resources can be obtained to meet the needs of clean production.

[0004] The present invention uses the ion adsorption method to efficiently enrich nickel ions in electroplating wastewater, resulting in extremely low nickel ion concentration in the effluent, without causing nickel ion heavy metal pollution. Moreover, the regenerated concentrated nickel solution has a relatively simple composition, facilitating subsequent purification to obtain nickel powder and realizing the comprehensive utilization of nickel resources. This method has a low investment in the comprehensive disposal of nickel ion resources, a simple operation process, realizes the dual utilization of water and heavy metals, and is conducive to engineering promotion. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies in the prior art and propose a method and device for efficiently recycling nickel ions in electroplating wastewater.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A method for efficiently recycling nickel ions in electroplating wastewater, the method comprising the following steps:

[0008] Step 1: Adsorption and purification: The nickel-containing electroplating wastewater is treated by using a resin and a dynamic continuous adsorption method. When the nickel ion concentration at the outlet reaches saturation, the adsorption process is stopped;

[0009] Step 2: Regeneration and concentration: A hydrochloric acid solution with a preset concentration is configured and used to regenerate the resin in a dynamic continuous manner. When the regenerated liquid reaches a predetermined volume, the regeneration is stopped;

[0010] Step 3: Oxalic acid precipitation: An oxalic acid solution with a preset concentration is configured and stirred with the regenerated nickel-containing concentrated solution to obtain a precipitate, and the precipitate is dried at a high temperature to obtain nickel powder.

[0011] Preferably, in the adsorption and purification step, the type of the resin is amino phosphonic acid chelating resin, the working flow rate is 2 - 4 BV / h, the resin filling volume is 1 / 50 - 1 / 40 of the volume of the treated water, the inlet nickel ion concentration needs to be greater than 10 mg / L, the inlet pH is 3 - 7, the inlet temperature is 30 - 70 °C, and the nickel ion outlet concentration at the adsorption end is greater than 0.2 mg / L.

[0012] Preferably, in the regeneration and concentration step, the concentration of hydrochloric acid is 4-6%, the working flow rate of the regeneration liquid is 1-2 BV / h, the usage volume of the regeneration liquid is 2.5-3 BV, in the oxalic acid precipitation step, the molar ratio of oxalate to nickel ions is 1-1.5:1, the rotation speed of the stirring reaction is 200-300 r / min, the drying temperature is 350-400 °C, and the drying time is 4-6 h.

[0013] Preferably, the regenerated nickel-containing concentrated liquid is subjected to oxalic acid precipitation and dried to prepare nickel powder. The reaction equation is:

[0014]

[0015] Preferably, the device includes a mounting base plate. A fixed cylinder is placed above the mounting base plate. A hot air blower is movably placed on the top of the fixed cylinder. A first movable plate is movably placed inside the fixed cylinder. A second movable plate is movably installed below the first movable plate. A collecting mechanism is provided at the bottom of the second movable plate.

[0016] Preferably, first sliding grooves are horizontally formed at both ends of the mounting base plate along the end wall direction. An L-shaped support rod is placed above the first sliding grooves. A first electric slider is installed at the bottom of the vertical end of the L-shaped support rod. The first electric slider is slidably installed inside the first sliding grooves. The horizontally adjacent sides of the two L-shaped support rods are both connected to the hot air blower.

[0017] Preferably, an annular sliding groove is formed at the top of the mounting base plate. The annular sliding groove is located directly below the fixed cylinder. Two second electric sliders are slidably installed inside the annular sliding groove. The two second electric sliders are symmetrically arranged. A first fixing column is installed at the top of the second electric slider. Second sliding grooves are vertically formed on the horizontally adjacent sides of the two first fixing columns. A third electric slider is slidably installed inside the second sliding grooves. The side of the third electric slider close to the fixed cylinder is fixedly connected to the fixed cylinder.

[0018] Preferably, a plurality of first slots are evenly penetrated through the top of the first movable plate in a circumferential direction, a spring telescopic rod is embedded and installed at the bottom of the first movable plate, a second slot is provided at the bottom of the first movable plate, the telescopic end of the spring telescopic rod is connected to the second movable plate, a plug-in plate is installed at the top of the second movable plate, the plug-in plate can be movably extended into the interior of the second slot, a third slot is provided at the top of the second movable plate, a plurality of second electric telescopic rods are penetrated and installed at the bottom of the second movable plate, the number of the second electric telescopic rods is the same as the number of the first slots, and the telescopic end of the second electric telescopic rod can extend to the interior of the first slot, a fixing plate is installed on the inner wall at the top of the third slot, a plurality of openings are evenly penetrated through the top of the fixing plate, a plurality of feeding holes are evenly penetrated through the bottom of the third slot, a fixing cylinder is installed on the inner wall above the first movable plate, a plurality of toggle claws are installed at the bottom of the fixing rod, the length of the toggle claws on both sides of the fixing rod is longer than the length of the middle toggle claw, and the toggle claws on both sides can extend to the interior of the first slot.

[0019] Preferably, a discharge barrel is installed at the bottom of the discharge hole, and two third sliding grooves are vertically opened on the outer wall of the discharge barrel, and a fourth electric slider is slidably installed inside the third sliding groove. A fixing mechanism is provided on the outer side of the discharge barrel, and a second rotating motor is embedded in the bottom of the second movable plate, and the output end of the second rotating motor is downward, and a first electric telescopic rod is installed on the mounting base below the second rotating motor, and the telescopic end of the first electric telescopic rod is connected to the output end of the second rotating motor.

[0020] Preferably, the fixing mechanism includes a fixing ring, a positioning rod and a first rotating motor. A fixing ring is placed on the outside of the unloading barrel, and the inner wall of the fixing ring is connected to the fourth electric slider on one side close to the fourth electric slider. A fourth groove is opened on the outer wall of the fixing ring along the circumferential direction, and a plurality of positioning rods are evenly placed inside the fourth groove. A plurality of first rotating motors are evenly installed on the top of the fixing ring, and the output end of the first rotating motor passes through the fixing ring and is connected to the top end of the positioning rod.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The method for efficiently recovering nickel ions proposed in the present invention can enrich nickel ions with slightly lower concentrations in electroplating wastewater, integrate ion exchange adsorption and chemical precipitation methods, the overall treatment process is simple and easy, the industrial equipment is well-equipped, and after fine control of the treatment process, efficient recovery of nickel ion resources can be achieved.

[0023] In the present invention, a fixed cylinder, a first movable plate and a second movable plate are provided, and the sediment stored in the fixed cylinder can be dried by a hot air blower. When the dried sediment enters the fixed plate, the first movable plate and the second movable plate rotate in opposite directions, and the first movable plate and the second movable plate squeeze each other, so that the dried sediment can be ground. Then, the ground powder falls from the opening, which increases the convenience of use of the device and enriches the functionality of the device.

[0024] In the present invention, a tossing claw is provided. When the tossing claw is inserted into the sediment, the sediment can be stirred, so that the drying effect of the hot air blower on the sediment is optimal, and uneven drying is avoided, and the sediment can be prevented from agglomerating. When the bottom of the tossing claw is level with the top of the first groove, the tossing claw can play the role of pushing the sediment on the top of the first movable plate into the first groove. When the tossing claw is extended into the interior of the first groove, the first movable plate is fixed.

[0025] In the present invention, a feeding barrel and a fixing ring are provided, and a worker inserts the feeding barrel into the interior of a tank for storing nickel powder. Then, the first rotating motor drives the positioning rod to rotate, so that the positioning rod is stuck in the interior of the tank, thereby fixing the storage tank. In addition, the fourth electric slider slides inside the third slide groove, and the distance between the bottom of the feeding barrel and the bottom of the storage tank can be adjusted, so that the nickel powder will not fly when it falls into the storage tank through the feeding barrel, thereby increasing the convenience of using the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the installation structure of the fixed cylinder and the first movable plate of the present invention;

[0028] Figure 3 It is a schematic diagram of the fixed cylinder structure of the present invention;

[0029] Figure 4 It is a schematic diagram of the connection structure between the first movable plate and the second movable plate of the present invention;

[0030] Figure 5 It is a schematic structural diagram of the first movable plate of the present invention;

[0031] Figure 6 It is a schematic structural diagram of the second movable plate of the present invention;

[0032] Figure 7 It is a schematic diagram of a third slotting structure of the present invention;

[0033] Figure 8 It is a schematic diagram of the structure of the lower barrel of the present invention;

[0034] Figure 9 It is a schematic structural diagram of the first fixing column of the present invention;

[0035] Figure 10 It is a schematic diagram of the structure of the second rotating electrical machine of the present invention.

[0036] In the figure: 1. mounting base plate; 2. fixing cylinder; 3. first fixing column; 4. first electric telescopic rod; 5. L-shaped support rod; 6. hot air blower; 7. first movable plate; 8. first slide groove; 9. first electric slider; 10. annular slide groove; 11. second electric slider; 12. fixing rod; 13. toggle claw; 14. second slide groove; 15. third electric slider; 16. second movable plate; 17. first slot; 18. second slot; 19. spring telescopic rod; 20. second electric telescopic rod; 21. unloading cylinder; 22. plug-in board; 23. third slot; 24. fixing plate; 25. opening; 26. unloading hole; 27. third slide groove; 28. fourth electric slider; 29. fixing ring; 30. fourth slot; 31. positioning rod; 32. first rotating motor; 33. second rotating motor. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0038] Reference Figure 1-10 , a method for efficiently recovering nickel ions from electroplating wastewater, the method comprising the following steps:

[0039] Step 1: Adsorption purification: Use resin to treat nickel-containing electroplating wastewater using a dynamic continuous adsorption method. When the outlet nickel ion concentration reaches saturation, stop the adsorption process;

[0040] Step 2: Regeneration and concentration: Prepare a hydrochloric acid solution with a preset concentration to regenerate the resin in a dynamic and continuous manner, and stop regeneration when the regeneration solution reaches a predetermined volume;

[0041] Step 3: Oxalic acid precipitation: Prepare an oxalic acid solution of a preset concentration and stir it with the regenerated nickel-containing concentrated solution to obtain a precipitate, and dry the precipitate at a high temperature to obtain nickel powder.

[0042] As a technical optimization scheme of the present invention, the type of resin in the adsorption purification step is aminophosphonic acid chelating resin, the working flow rate is 2-4BV / h, the resin filling volume is 1 / 50-1 / 40 of the treated water volume, the inlet water nickel ion concentration needs to be greater than 10 mg / L, the inlet water pH is 3-7, the inlet water temperature is 30-70°C, and the nickel ion outlet concentration at the adsorption endpoint is greater than 0.2 mg / L.

[0043] As a technical optimization solution of the present invention, in the regeneration and concentration step, the concentration of hydrochloric acid is 4-6%, the working flow rate of the regeneration liquid is 1-2 BV / h, the usage volume of the regeneration liquid is 2.5-3 BV, in the oxalic acid precipitation step, the molar ratio of oxalate radical to nickel ion is 1-1.5:1, the rotation speed of the stirring reaction is 200-300 r / min, the drying temperature is 350-400 °C, and the drying time is 4-6 h.

[0044] As a technical optimization solution of the present invention, the regenerated nickel-containing concentrated liquid is subjected to oxalic acid precipitation and dried to prepare nickel powder, and the reaction equation is:

[0045]

[0046] As a technical optimization solution of the present invention, the device includes a mounting base plate 1, a fixed cylinder 2 is placed above the mounting base plate 1, a hot air blower 6 is movably placed on the top of the fixed cylinder 2, a first movable plate 7 is movably placed inside the fixed cylinder 2, a second movable plate 16 is movably installed below the first movable plate 7, and a collection mechanism is provided at the bottom of the second movable plate 16. The hot air blower 6 can dry the precipitate inside the fixed cylinder 2, and the collection mechanism can collect the precipitate after the drying treatment.

[0047] As a technical optimization solution of the present invention, first sliding grooves 8 are horizontally opened at both ends of the mounting base plate 1 along the end wall direction, an L-shaped support rod 5 is placed above the first sliding grooves 8, a first electric slider 9 is installed at the bottom of the vertical end of the L-shaped support rod 5, the first electric slider 9 is slidably installed inside the first sliding grooves 8, and both sides of the horizontal ends of the two L-shaped support rods 5 close to each other are connected to the hot air blower 6. The first electric slider 9 slides in the first sliding grooves 8, drives the L-shaped support rod 5 to move, and then the hot air blower 6 moves to open the opening at the top of the fixed cylinder 2, which is convenient for the staff to add the precipitate into the fixed cylinder 2 and increases the use convenience of the device.

[0048] As a technical optimization solution of the present invention, an annular chute 10 is opened at the top of the mounting base plate 1. The annular chute 10 is located directly below the fixed cylinder 2. Two second electric sliders 11 are slidably installed inside the annular chute 10. The two second electric sliders 11 are symmetrically arranged. A first fixing column 3 is installed at the top of the second electric slider 11. Second chutes 14 are vertically opened on the sides of the two first fixing columns 3 close to each other. A third electric slider 15 is slidably installed inside the second chute 14. The side of the third electric slider 15 close to the fixed cylinder 2 is fixedly connected to the fixed cylinder 2. The movement of the second electric slider 11 in the annular chute 10 can drive the fixed cylinder 2 to rotate, and the sliding of the third electric slider 15 inside the second chute 14 can move the fixed cylinder 2 up and down, facilitating the staff to take out the first movable plate 7 and the second movable plate 16 for maintenance.

[0049] As a technical optimization solution of the present invention, a plurality of first slots 17 are evenly penetrated through the top of the first movable plate 7 along the circumferential direction, a spring telescopic rod 19 is embedded and installed at the bottom of the first movable plate 7, a second slot 18 is provided at the bottom of the first movable plate 7, the telescopic end of the spring telescopic rod 19 is connected to the second movable plate 16, a plug-in board 22 is installed at the top of the second movable plate 16, and the plug-in board 22 can be movably extended into the interior of the second slot 18, a third slot 23 is provided at the top of the second movable plate 16, and a plurality of second electric telescopic rods 20 are installed through the bottom of the second movable plate 16, and the number of second electric telescopic rods 20 is The number is the same as the number of the first slot 17, and the telescopic end of the second electric telescopic rod 20 can extend to the inside of the first slot 17, a fixing plate 24 is installed on the top inner wall of the third slot 23, and a plurality of openings 25 are evenly penetrated through the top of the fixing plate 24, and a plurality of discharge holes 26 are evenly penetrated through the bottom of the third slot 23, a fixing rod 12 is installed on the inner wall above the first movable plate 7 of the fixing cylinder 2, and a plurality of driving claws 13 are installed at the bottom of the fixing rod 12, the length of the driving claws 13 on both sides of the fixing rod 12 is longer than the length of the middle driving claw 13, and the driving claws 13 on both sides can extend to the inside of the first slot 17. When the toggle claw 13 is inserted into the sediment, the sediment can be stirred, so that the drying effect of the hot air blower 6 on the sediment is optimal, and the drying is uneven, and the sediment can be prevented from agglomerating. When the bottom of the toggle claw 13 is level with the top of the first slot 17, the toggle claw 13 can play the role of pushing the sediment on the top of the first movable plate 7 into the first slot 17. When the toggle claw 13 extends into the interior of the first slot 17, the first movable plate 7 is fixed. The spring telescopic rod 19 can make the first movable plate 7 and the second movable plate 7 The plate 16 can achieve two usage states of separation and overlap, and the plug-in plate 22 can block the falling sediment. The first movable plate 7 and the second movable plate 16 rotate alternately, and under the continuous extension of the first electric telescopic rod 4, the first movable plate 7 and the second movable plate 16 grind the sediment on the top of the fixed plate 24, and the ground powder can fall from the opening 25 to the bottom of the third slot 23, and then the powder falls downward from the discharge hole 26 along the discharge barrel 21, completing the initial grinding of the sediment, increasing the functionality and ease of use of the device.

[0050] As a technical optimization solution of the present invention, a discharge tube 21 is installed at the bottom of the discharge hole 26. Two third chutes 27 are vertically formed on the outer wall of the discharge tube 21. A fourth electric slider 28 is slidably installed inside the third chute 27. A fixing mechanism is provided outside the discharge tube 21. A second rotary motor 33 is embedded at the bottom of the second movable plate 16. The output end of the second rotary motor 33 faces downward, and a first electric telescopic rod 4 is installed below the second rotary motor 33 on the mounting base plate 1. The telescopic end of the first electric telescopic rod 4 is connected to the output end of the second rotary motor 33. The ground powder falls along the discharge hole 26 and is collected from the bottom of the discharge tube 21.

[0051] As a technical optimization solution of the present invention, the fixing mechanism includes a fixing ring 29, a positioning rod 31 and a first rotary motor 32. A fixing ring 29 is placed outside the discharge tube 21. One side of the inner wall of the fixing ring 29 close to the fourth electric slider 28 is connected to the fourth electric slider 28. A fourth slot 30 is formed on the outer wall of the fixing ring 29 along the circumferential direction. A plurality of positioning rods 31 are evenly placed inside the fourth slot 30. A plurality of first rotary motors 32 are evenly installed on the top of the fixing ring 29. The output end of the first rotary motor 32 penetrates the fixing ring 29 and is connected to one end of the top of the positioning rod 31. The discharge tube 21 is inserted into the inside of the can for storing nickel powder. Subsequently, the first rotary motor 32 drives the positioning rod 31 to rotate, so that the positioning rod 31 is stuck inside the can, playing a role in fixing the storage tank. And the fourth electric slider 28 slides inside the third chute 27, and the distance between the bottom of the discharge tube 21 and the bottom of the storage tank can be adjusted, so that nickel powder will not fly when falling into the storage tank through the discharge tube 21.

[0052] When the present invention is in use, the staff fishes out the precipitate obtained in the oxalic acid precipitation step. Subsequently, the first electric slider 9 slides in the first chute 8, driving the L-shaped support rod 5 to move. Then the hot air blower 6 moves to open the opening at the top of the fixed cylinder 2. Then the staff adds the precipitate from the top of the fixed cylinder 2 into the inside of the fixed cylinder 2, and the precipitate accumulates on the top of the first movable plate 7. Subsequently, the first electric slider 9 makes a reset movement in the first chute 8, so that the hot air blower 6 moves to the top of the fixed cylinder 2 again. Then the hot air blower 6 starts to operate to dry the precipitate inside the fixed cylinder 2.

[0053] During the process of drying the sediment, the first electric telescopic rod 4 extends upward, so that the first movable plate 7 and the second movable plate 16 move upward inside the fixed cylinder 2. When the shifting claw 13 contacts and inserts into the sediment, the second movable plate 16 is driven to rotate by the second rotating motor 33, or the second electric slider 11 moves in the annular slide groove 10 to rotate the fixed cylinder 2, both of which can make the shifting claw 13 stir the sediment, so that the hot air blower 6 can achieve the best drying effect on the sediment, avoid uneven drying, and prevent the sediment from agglomerating.

[0054] After the sediment in the fixed cylinder 2 is dried, the second electric telescopic rod 20 begins to retract and will retract until the top of the telescopic end of the second electric telescopic rod 20 is flush with the top of the fixed plate 24. At this time, the first slot 17 is completely exposed. At this time, the sediment can fall from the first slot 17 to the top of the fixed plate 24. At this time, the first movable plate 7 moves upward inside the fixed cylinder 2, so that the bottom of the moving claws 13 at both ends of the fixed rod 12 is flush with the top of the first slot 17. At this time, the first movable plate 7 or the fixed cylinder 2 is rotated again, and the moving claws 13 can play a role in pushing the sediment on the top of the first movable plate 7 into the first slot 17.

[0055] When all the sediment on the top of the first movable plate 7 falls on the top of the fixed plate 24, the first movable plate 7 moves upward again inside the fixed cylinder 2, so that the driving claws 13 at both ends of the fixed rod 12 extend into the first slot 17, thereby fixing the first movable plate 7. At this time, the first electric telescopic rod 4 continues to push the second movable plate 16 upward, and at the same time, the second rotating motor 33 drives the second movable plate 16 to rotate, and the fixed cylinder 2 rotates in the opposite direction of the second movable plate 16. Since the driving claw 13 is inserted into the first slot 17, the fixed cylinder 2 rotates with the first movable plate 7 at this time. At this time, the first movable plate 7 and the second movable plate 16 rotate alternately, and under the continuous extension of the first electric telescopic rod 4, the first movable plate 7 and the second movable plate 16 grind the sediment on the top of the fixed plate 24, and the ground powder can fall from the opening 25 to the bottom of the third slot 23, and then the powder falls downward along the discharge cylinder 21 from the discharge hole 26.

[0056] The staff extends the lower barrel 21 into the interior of the jar for storing nickel powder, and then the first rotating motor 32 drives the positioning rod 31 to rotate, so that the positioning rod 31 is stuck inside the jar, fixing the storage tank, and the fourth electric slider 28 slides inside the third slide groove 27, which can adjust the distance between the bottom of the lower barrel 21 and the bottom of the storage tank, so that the nickel powder will not fly when it falls into the storage tank through the lower barrel 21.

[0057] The preparation method of the present invention will be further described below in conjunction with embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention. Embodiment

[0058] There is a nickel-containing electroplating wastewater in an electroplating sewage treatment station in Anshan that needs to be treated. The method described in the present invention is used for operation, and the specific implementation method is as follows.

[0059] The composition of the influent after the nickel-containing wastewater passes through the regulating tank is as follows in the table:

[0060] Item Index Unit Treatment Flow 1.67 m3 / h Nickel Import Content 50 ppm PH 3.5～6.5 / Temperature 30～70 ℃ Nickel Export Content 0.25 ppm SS <2 mg / L

[0061] The resin filling volume is 1 m3, and the operation logic of the adsorption and regeneration process:

[0062] Process Step Direction Feed Liquid Flow (m3 / h) Time h Adsorption Forward Feed Liquid 1.67 370.00 Backwash Reverse Feed Liquid 3.01 0.40 6% Hydrochloric Acid Regeneration - 1 Forward 6% Hydrochloric Acid 1.00 0.96 6% Hydrochloric Acid Regeneration - 2 Forward 6% Hydrochloric Acid 1.00 1.37 Acid Washing with Water - 1 Forward Water 1.00 1.21 Acid Washing with Water - 2 Forward Water 1.00 1.93 Adsorption - 2 Forward Feed Liquid 1.67 370.00

[0063] The recovery rate of the nickel powder prepared in this process is about 88%, and the nickel powder is relatively pure without impurities.

[0064] Through the modification method of the present invention, the ion exchange process is finely controlled, and the nickel resource recovery from electroplating nickel-containing wastewater is successfully realized. For the direction of resource utilization of electroplating wastewater, a successful and referenceable case is provided, which provides a very objective prospect for the engineering application of nickel resource recovery and ensures that the electroplating industry moves towards a more environmentally friendly direction.

[0065] The above is only the preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A device for efficiently recovering nickel ions from electroplating wastewater, the device comprising a mounting base plate (1), a fixed cylinder (2) is placed above the mounting base plate (1), a hot air blower (6) is movably placed on the top of the fixed cylinder (2), a first movable plate (7) is movably placed inside the fixed cylinder (2), a second movable plate (16) is movably installed below the first movable plate (7), and a collecting mechanism is provided at the bottom of the second movable plate (16); An annular slide groove (10) is provided on the top of the mounting base plate (1), and the annular slide groove (10) is located directly below the fixing cylinder (2). Two second electric slide blocks (11) are slidably mounted inside the annular slide groove (10), and the two second electric slide blocks (11) are symmetrically arranged. A plurality of first slots (17) are evenly penetrated through the top of the first movable plate (7) along the circumferential direction; a spring telescopic rod (19) is embedded and installed at the bottom of the first movable plate (7); a second slot (18) is provided at the bottom of the first movable plate (7); the telescopic end of the spring telescopic rod (19) is connected to the second movable plate (16); a plug-in board (22) is installed at the top of the second movable plate (16); the plug-in board (22) can be movably extended into the interior of the second slot (18); a third slot (23) is provided at the top of the second movable plate (16); a plurality of second electric telescopic rods (20) are penetrated and installed at the bottom of the second movable plate (16); the number of the second electric telescopic rods (20) is the same as that of the first slot (18); 7), and the telescopic end of the second electric telescopic rod (20) extends to the inside of the first slot (17), a fixing plate (24) is installed on the top inner wall of the third slot (23), a plurality of openings (25) are evenly penetrated through the top of the fixing plate (24), and a plurality of discharge holes (26) are evenly penetrated through the bottom of the third slot (23), a fixing rod (12) is installed on the inner wall above the first movable plate (7), a plurality of moving claws (13) are installed at the bottom of the fixing rod (12), the length of the moving claws (13) on both sides of the fixing rod (12) is longer than the length of the middle moving claw (13), and the moving claws (13) on both sides can extend to the inside of the first slot (17); The device is suitable for the following method, which comprises the following steps: Step 1: Adsorption purification: Use resin to treat nickel-containing electroplating wastewater using a dynamic continuous adsorption method. When the outlet nickel ion concentration reaches saturation, stop the adsorption process; Step 2: Regeneration and concentration: Prepare a hydrochloric acid solution with a preset concentration to regenerate the resin in a dynamic and continuous manner, and stop regeneration when the regeneration solution reaches a predetermined volume; Step 3: Oxalic acid precipitation: Prepare an oxalic acid solution of a preset concentration and stir it with the regenerated nickel-containing concentrated solution to obtain a precipitate, and dry the precipitate at a high temperature to obtain nickel powder.

2. The device for highly efficient recovery of nickel ions in electroplating wastewater according to claim 1, wherein, In the adsorption and purification step, the type of resin is amino phosphonic acid chelating resin, the working flow rate is 2 - 4 BV / h, the resin filling volume is 1 / 50 - 1 / 40 of the treated water volume, the inlet nickel ion concentration needs to be greater than 10 mg / L, the inlet pH is 3 - 7, the inlet temperature is 30 - 70 °C, and the outlet concentration of nickel ions at the adsorption end point is greater than 0.2 mg / L.

3. The device for efficiently recovering nickel ions in electroplating wastewater according to claim 1, wherein In the regeneration and concentration step, the concentration of hydrochloric acid is 4 - 6%, the working flow rate of the regeneration liquid is 1 - 2 BV / h, the volume of the regeneration liquid used is 2.5 - 3 BV, in the oxalic acid precipitation step, the molar ratio of oxalate to nickel ions is 1 - 1.5:1, the rotation speed of the stirring reaction is 200 - 300 r / min, the drying temperature is 350 - 400 °C, and the drying time is 4 - 6 h.

4. The device for highly efficient recovery of nickel ions in electroplating wastewater according to claim 1, wherein, The regenerated nickel-containing concentrated solution is subjected to oxalic acid precipitation and dried to prepare nickel powder. The reaction equation is:

5. The device for highly efficient recovery of nickel ions in electroplating wastewater according to claim 1, wherein, Both ends of the installation base plate (1) are horizontally provided with first sliding grooves (8) along the end wall direction. An L-shaped support rod (5) is placed above the first sliding groove (8). A first electric slider (9) is installed at the bottom of the vertical end of the L-shaped support rod (5). The first electric slider (9) is slidably installed inside the first sliding groove (8). The horizontally adjacent sides of the two L-shaped support rods (5) are both connected to the hot air blower (6).

6. The device for highly efficient recovery of nickel ions in electroplating wastewater according to claim 1, characterized in that, A first fixed column (3) is installed at the top of the second electric slider (11). Second sliding grooves (14) are vertically opened on the horizontally adjacent sides of the two first fixed columns (3). A third electric slider (15) is slidably installed inside the second sliding groove (14). The side of the third electric slider (15) close to the fixed cylinder (2) is fixedly connected to the fixed cylinder (2).

7. The device for efficiently recovering nickel ions from electroplating wastewater according to claim 1, wherein, A blanking cylinder (21) is installed at the bottom of the blanking hole (26). Two third sliding grooves (27) are vertically opened on the outer wall of the blanking cylinder (21). A fourth electric slider (28) is slidably installed inside the third sliding groove (27). A fixing mechanism is provided outside the blanking cylinder (21). A second rotating motor (33) is embedded at the bottom of the second movable plate (16). The output end of the second rotating motor (33) faces downward, and a first electric telescopic rod (4) is installed below the second rotating motor (33) on the installation base plate (1). The telescopic end of the first electric telescopic rod (4) is connected to the output end of the second rotating motor (33).

8. The device for highly efficiently recovering nickel ions in electroplating wastewater according to claim 7, characterized in that, The fixing mechanism includes a fixing ring (29), positioning rods (31) and a first rotating motor (32). A fixing ring (29) is placed outside the blanking cylinder (21). The side of the inner wall of the fixing ring (29) close to the fourth electric slider (28) is connected to the fourth electric slider (28). A fourth slot (30) is opened on the outer wall of the fixing ring (29) along the circumferential direction. A plurality of positioning rods (31) are evenly placed inside the fourth slot (30). A plurality of first rotating motors (32) are evenly installed on the top of the fixing ring (29). The output end of the first rotating motor (32) penetrates through the fixing ring (29) and is connected to the top end of the positioning rod (31).

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