Lithium battery production wastewater thallium removal device and thallium removal method

Abstract

The invention discloses a thallium removal device and a thallium removal method for wastewater in lithium battery production. The thallium removal device comprises a base and a dosing device, the top of the base is provided with a first dosing pool and a second dosing pool, the first dosing pool and the second dosing pool are communicated through drainage pipes, the drainage pipes are provided with control valves, the outer sides of the first dosing pool and the second dosing pool are both provided with supporting frames, the number of the drainage pipes is two, and the two drainage pipes are evenly distributed on one side of the first dosing pool; the chemical adding device is used for adding chemicals into the first chemical adding tank and the second chemical adding tank; the top of the dosing device penetrates through the support frame and is fixedly connected with the support frame; the dosing device comprises a dosing cylinder, a limiting column, a crushing device and a diffusion device; the crushing device is used for crushing the solid medicament discharged by the dosing cylinder; the diffusion device is used for expanding the throwing range of the powder medicament discharged by the dosing cylinder; when chemicals are added into the chemical adding pool, solid powder can be prevented from caking to influence the uniformity during throwing.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a wastewater thallium removal device and a thallium removal method for lithium battery production. Background Art

[0002] Battery technology is crucial in the field of electric vehicles. One of the main raw materials needed for lithium battery production is lithium compounds. The main methods for producing lithium chemical products are ore method and salt lake lithium extraction (lithium battery disassembly and recycling to produce lithium compounds will also play an important role in the future). For lithium extraction from ores, solid waste / hazardous waste and aqueous solution containing highly toxic heavy metal pollutants thallium will eventually be produced (production liquid of the process or desulfurization and denitrification wastewater, leachate generated by solid waste / hazardous waste after lithium extraction). Wastewater generated in the field of power lithium battery disassembly usually also contains thallium. For wastewater or process production solution generated after or during lithium extraction, the thallium content varies from tens of micrograms per liter to more than one hundred milligrams per liter. Thallium is a highly toxic heavy metal pollutant. According to general domestic local standards, it is usually required that the thallium content in wastewater does not exceed 5μg / L (the enterprise standard is not more than 2μg / L). For the lithium-containing solution in the lithium extraction process (collectively referred to as brine, which does not refer to the halogen-containing aqueous solution), it is generally required that the thallium content after thallium removal does not exceed 200μg / L.

[0003] When adding solid powdered medicine into the medicine adding tank in the existing device, the stored solid powder is easy to agglomerate, thereby affecting the uniformity of spreading, resulting in reduced efficiency of medicine adding. Summary of the invention

[0004] In order to solve the above technical problems, the present invention is implemented through the following technical solutions: The first aspect of the present invention provides a device for removing thallium from wastewater in lithium battery production, comprising a base and a dosing device; A first dosing tank and a second dosing tank are provided on the top of the base, and the first dosing tank and the second dosing tank are connected through a drainage pipe, and a control valve is provided on the drainage pipe. Support frames are provided on the outsides of the first dosing tank and the second dosing tank, and two groups of drainage pipes are provided, and the two groups of drainage pipes are evenly distributed on one side of the first dosing tank; The dosing device is used to add medicine to the first dosing tank and the second dosing tank; the top of the dosing device penetrates the support frame and is fixedly connected to the support frame; The dosing device comprises a dosing cartridge, a limiting column, a crushing device and a diffusion device; the crushing device is used to crush the solid medicine discharged from the dosing cartridge; the diffusion device is used to expand the spreading range of the powder medicine discharged from the dosing cartridge.

[0005] Preferably, the dosing device further comprises a limiting column; A drug discharge port is provided at the bottom of the drug adding cartridge, a adding pipe is connected to one end of the drug adding cartridge near the top, arc-shaped sliding ports are symmetrically provided at both ends of the drug adding cartridge, and a reinforcement bracket is fixedly connected to the top of the drug adding cartridge; The outer side of the limiting column is rotatably connected to a sealing plate, both sides of the sealing plate are fixedly connected to annular sealing plates, and the side of the annular sealing plate away from the sealing plate is slidably connected to an arcuate electric slide rail through an electric slider, and the electric slider passes through the arcuate sliding opening.

[0006] Preferably, the top of the reinforcement bracket passes through the support frame and is fixedly connected to the support frame, two groups of sealing plates are provided, and the two groups of sealing plates are symmetrically distributed on both sides of the limit column, both ends of the limit column are fixedly connected to the inner wall of the drug adding cartridge, and the outer side of the arc-shaped electric slide rail is fixedly connected to the outer wall of the drug adding cartridge.

[0007] Preferably, one side of the crushing device is fixedly connected to the outer wall of the drug-adding cartridge, and two groups of the crushing devices are provided, and the two groups of the crushing devices are symmetrically distributed on both sides of the drug-adding cartridge; The crushing device includes a fixed frame, the inner wall of the fixed frame is fixedly connected to a limiting slide, the limiting slides on both sides of the inner wall of the fixed frame are respectively slidably connected to the first crushing plate and the second crushing plate, the tops of the first crushing plate and the second crushing plate are fixedly connected to a reset spring, a rectangular opening is opened on the side of the fixed frame, the top of the inner wall of the rectangular opening is fixedly connected to an electric slide rail, and the electric slide rail is slidably connected to a pressing block.

[0008] Preferably, the top of the return spring is fixedly connected to the top of the inner wall of the fixed frame, the top of the fixed frame is fixedly connected to the outer wall of the dosing cartridge, two groups of rectangular openings are opened, and the two groups of rectangular openings are symmetrically distributed on both sides of the fixed frame, the bottom of the pressing block is set as an inclined surface, and the tops of the first crushing plate and the second crushing plate are both set as inclined surfaces.

[0009] Preferably, the top of the diffusion device is fixedly connected to the outer side of the drug adding cartridge near the bottom; The diffusion device includes a positioning bracket, the top of the positioning bracket is fixedly connected to a driving motor, the output end of the driving motor is fixedly connected to a rotating column, the outer side of the rotating column is fixedly connected to a support rod, a sliding opening is opened on the support rod, the inner wall of the sliding opening is connected to a movable block through a spring, a movable sleeve is sleeved and slidably connected to the outer side of the support rod, and a spiral plate is fixedly connected to the outer side of the movable sleeve.

[0010] Preferably, both ends of the positioning bracket are fixedly connected to the side of the drug adding cartridge, the output end of the driving motor passes through the positioning bracket and is rotationally connected to the positioning bracket, and both ends of the movable block are fixedly connected to the inner wall of the movable sleeve.

[0011] Preferably, a rotating disk is fixedly connected to the bottom of the rotating column, an electric telescopic rod is fixedly connected to the bottom of the rotating disk, a moving column is fixedly connected to the bottom of the electric telescopic rod, a wave plate is fixedly connected to the outer side of the moving column, and drainage holes are opened on the wave plate; The wave plates are provided in two groups, and the two groups of wave plates are symmetrically distributed on both sides of the moving column. The drainage holes are provided in multiple groups, and the multiple groups of drainage holes are evenly distributed on the wave plates.

[0012] The second aspect of the present invention provides a method for removing thallium from wastewater in lithium battery production based on the above-mentioned wastewater thallium removal device, which specifically comprises the following steps: Step S1, the workshop production wastewater is first subjected to defluorination treatment; the wastewater after defluorination is prepared for post-stage thallium removal treatment; Step S2, the wastewater after defluorination in S1 enters the first dosing tank, lime and KMnO4 are added to the first dosing tank, and the pH value is adjusted to between 7 and 10 by adding lime; after the pH value is adjusted, KMnO4 is added to the wastewater with the adjusted pH value in an amount of 100g / m3, and after the addition of KMnO4 is completed, the wastewater after the dosing is subjected to a primary UV oxidation reaction; the time of the primary UV oxidation reaction is 30min; Step S3, after the first-level UV oxidation reaction is completed, a sufficient amount of PAM is added to the wastewater; after the addition of PAM is completed, the wastewater is subjected to first-level flocculation and precipitation; the clean water after the first-level flocculation and precipitation is discharged into the second dosing tank, KMnO4 is added in an amount of 50g / m3, and after the addition of KMnO4 is completed, the clean water is subjected to second-level oxidation treatment; the oxidation treatment time is 30min; Step S4: After the secondary oxidation treatment is completed, sufficient amount of PAM is added to the wastewater for secondary flocculation precipitation; Step S5, PAC is added to the clean water obtained after the secondary flocculation precipitation in an amount of 10 g / m3; after the addition of PAC is completed, sodium sulfide is added to the clean water in an amount of 15 g / L; after the addition of sodium sulfide is completed, sulfuric acid is added to the clean water to adjust the pH value of the clean water to between 7 and 10; after the pH value is adjusted, sufficient amount of PAM is added to the clean water for tertiary flocculation precipitation; the supernatant obtained after the tertiary flocculation precipitation is filtered.

[0013] Preferably, in step S2, the drug addition process includes the following steps: Step a1, open the arc-shaped electric slide rail, and the electric slider inside the arc-shaped electric slide rail drives the sealing plate to rotate around the limit column. Since two groups of sealing plates are provided, the two groups of sealing plates can be synchronously rotated around the limit column under the drive of the electric slider inside the arc-shaped electric slide rail. When the sealing plate rotates, it gradually moves away from the drug discharge port, that is, it no longer blocks the drug discharge port, and the solid medicine filled in the drug cartridge slides out from the drug discharge port along the top of the sealing plate; Step a2, turning on the electric slide rail to drive the pressing block to move through the internal electronic slider, the pressing block squeezes the first crushing plate when passing through the first crushing plate, the first crushing plate pulls the reset spring and slides downward along the limit slide, then the electronic slider drives the pressing block to move to the top of the second crushing plate and squeezes the second crushing plate, the second crushing plate also pulls the reset spring and slides downward along the limit slide, the first crushing plate and the second crushing plate alternately squeeze the sealing plate downward, and squeeze and shred the solid medicine on the sealing plate; Step a3, turn on the driving motor to drive the rotating column to rotate, the rotating column drives the supporting rod to rotate, the moving sleeve is acted upon by the centrifugal force to drive the movable block to slide along the sliding opening and pull the spring inside the sliding opening, the moving sleeve drives the spiral plate to rotate during the movement, and the spiral plate spreads the powder medicine sprinkled into the dosing tank further; Step a4, turn on the electric telescopic rod to drive the moving column to move upward, and the moving column drives the wave plate to move. During the movement of the wave plate, the liquid at the bottom of the dosing tank is turned upward.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention installs the dosing device, and the electric slider inside the arc-shaped electric slide rail drives the sealing plate to rotate around the limit column. Since the sealing plate is provided with two groups, the two groups of sealing plates can be synchronously rotated around the limit column under the drive of the electric slider inside the arc-shaped electric slide rail. When the sealing plate rotates, it gradually moves away from the drug discharge port, that is, it no longer blocks the drug discharge port. The solid medicine filled in the dosing cylinder slides out from the drug discharge port along the top of the sealing plate, and the solid medicine can be sprinkled into the first dosing tank and the second dosing tank. The larger the amplitude of the arc-shaped electric slide rail driving the sealing plate to rotate, the more medicine is discharged from the drug discharge port along the sealing plate, so that the amount of medicine sprinkled can be controlled and quantitative dosing can be maintained, which is conducive to improving the dosing efficiency and the practicality of the device. Through the installation of the crushing device, the electric slide rail drives the pressing block to move through the internal electronic slider. The pressing block squeezes the first crushing plate when passing through the first crushing plate, and the first crushing plate pulls the reset spring and slides downward along the limiting slide. Then the electronic slider drives the pressing block to move to the top of the second crushing plate and squeezes the second crushing plate. The second crushing plate also pulls the reset spring and slides downward along the limiting slide. The first crushing plate and the second crushing plate alternately squeeze the sealing plate downward to squeeze and shred the solid medicine on the sealing plate to prevent the solid powder from agglomerating and affecting the uniformity during scattering. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the wastewater thallium removal device of the present invention; Figure 2 It is a partial structural schematic diagram of the wastewater thallium removal device of the present invention; Figure 3This is a schematic diagram of the internal structure of the first dosing tank of the present invention; Figure 4 It is a schematic diagram of the structure of the dosing device of the present invention; Figure 5 It is a partial structural schematic diagram of the dosing device of the present invention; Figure 6 This is a schematic diagram of the internal structure of the drug adding cartridge of the present invention; Figure 7 It is a structural schematic diagram of the fixing frame of the present invention; Figure 8 It is a structural schematic diagram of the support rod of the present invention; Fig. 9 It is a schematic diagram of the structure of the corrugated plate of the present invention; Fig.10 This is a flowchart of the method for removing thallium from wastewater in lithium battery production according to the present invention; In the figure: 1, base; 2, first dosing tank; 3, second dosing tank; 4, drain pipe; 5, control valve; 6, support frame; 7, dosing device; 71, dosing cylinder; 72, discharge port; 73, adding pipe; 74, arc slide; 75, reinforcement bracket; 76, limit column; 77, sealing plate; 78, crushing device; 781, fixed frame; 782, limit slide; 783, first crushing plate; 784, second crushing plate; 785, reset spring; 786, rectangular Mouth; 787, electric slide rail; 788, pressing block; 79, diffusion device; 791, positioning bracket; 792, driving motor; 793, rotating column; 794, supporting rod; 795, sliding mouth; 796, movable block; 797, moving sleeve; 798, spiral plate; 799, rotating disk; 7910, electric telescopic rod; 7911, moving column; 7912, wave plate; 7913, drainage hole; 710, annular sealing plate; 711, arc-shaped electric slide rail. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] For example, see Figure 1-Figure 9 The embodiment of the present invention provides a wastewater thallium removal device for lithium battery production, comprising: A base 1, a first dosing tank 2 and a second dosing tank 3 are fixedly connected to the top of the base 1, the first dosing tank 2 and the second dosing tank 3 are connected through a drainage pipe 4, a control valve 5 is installed on the drainage pipe 4, and the outer sides of the first dosing tank 2 and the second dosing tank 3 are fixedly connected to a support frame 6; A dosing device 7, which is used to add drugs into the first dosing tank 2 and the second dosing tank 3; Two groups of drainage pipes 4 are provided, and the two groups of drainage pipes 4 are evenly distributed on one side of the first dosing tank 2 . The top of the dosing device 7 passes through the support frame 6 and is fixedly connected to the support frame 6 .

[0018] The wastewater thallium removal device of this embodiment, specifically, the dosing device 7 includes: A medicine adding barrel 71, a medicine discharging port 72 is provided at the bottom of the medicine adding barrel 71, a adding pipe 73 is connected to one end of the medicine adding barrel 71 near the top, arc-shaped sliding ports 74 are symmetrically provided at both ends of the medicine adding barrel 71, and a reinforcing bracket 75 is fixedly connected to the top of the medicine adding barrel 71; The limiting column 76, the outer side of the limiting column 76 is rotatably connected to a sealing plate 77 through a rolling bearing, both sides of the sealing plate 77 are fixedly connected to an annular sealing plate 710 through a bracket, and the side of the annular sealing plate 710 away from the sealing plate 77 is slidably connected to an arc-shaped electric slide rail 711 through an electric slider, and the electric slider passes through the arc-shaped sliding port 74; A crushing device 78, which is used to crush the solid medicine discharged from the medicine adding cartridge 71; The diffusion device 79 is used to expand the diffusion range of the powder medicine discharged from the medicine adding cartridge 71.

[0019] The top of the reinforcement bracket 75 passes through the support frame 6 and is fixedly connected to the support frame 6. Two groups of sealing plates 77 are provided. The two groups of sealing plates 77 are symmetrically distributed on both sides of the limiting column 76. Both ends of the limiting column 76 are fixedly connected to the inner wall of the dosing cartridge 71. The outer side of the arc-shaped electric slide rail 711 is fixedly connected to the outer wall of the dosing cartridge 71 through the bracket.

[0020] One side of the crushing device 78 is fixedly connected to the outer wall of the dosing cartridge 71 . Two groups of crushing devices 78 are provided. The two groups of crushing devices 78 are symmetrically distributed on both sides of the dosing cartridge 71 . The top of the diffusion device 79 is fixedly connected to the outer side of the dosing cartridge 71 near the bottom.

[0021] The crushing device 78 includes a fixed frame 781, the inner wall of the fixed frame 781 is fixedly connected to a limiting slide 782, the limiting slides 782 on both sides of the inner wall of the fixed frame 781 are respectively slidably connected to the first crushing plate 783 and the second crushing plate 784, the tops of the first crushing plate 783 and the second crushing plate 784 are fixedly connected to a return spring 785, a rectangular opening 786 is opened on the side of the fixed frame 781, the top of the inner wall of the rectangular opening 786 is fixedly connected to an electric slide rail 787, and the electric slide rail 787 is slidably connected to a pressing block 788 through an internal electronic slider.

[0022] The top of the reset spring 785 is fixedly connected to the top of the inner wall of the fixed frame 781, and the top of the fixed frame 781 is fixedly connected to the outer wall of the dosing cartridge 71 through a bracket. Two groups of rectangular openings 786 are provided, and the two groups of rectangular openings 786 are symmetrically distributed on both sides of the fixed frame 781. The bottom of the pressing block 788 is set as an inclined surface, and the tops of the first crushing plate 783 and the second crushing plate 784 are both set as inclined surfaces.

[0023] When in use, wastewater enters the first dosing tank 2, and the dosing device 7 is used to sprinkle the medicine into the first dosing tank 2. Then, the wastewater is discharged into the second dosing tank 3 through the drain pipe 4 after flocculation and sedimentation. The dosing device 7 is also used to sprinkle the medicine into the second dosing tank 3. The arc-shaped electric slide rail 711 is opened, and the electric slider inside the arc-shaped electric slide rail 711 drives the sealing plate 77 to rotate around the limit column 76. Since the sealing plate 77 is provided with two groups, the two groups of sealing plates 77 can be driven by the electric slider inside the arc-shaped electric slide rail 711 to rotate synchronously around the limit column 76. As the column 76 rotates, the sealing plate 77 gradually moves away from the discharge port 72 and no longer blocks the discharge port 72. The solid medicine filled in the dosing cylinder 71 slides out from the discharge port 72 along the top of the sealing plate 77, and the solid medicine can be scattered into the first dosing tank 2 and the second dosing tank 3. The greater the amplitude of the rotation of the sealing plate 77 driven by the arc-shaped electric slide rail 711, the more medicine is discharged from the discharge port 72 along the sealing plate 77, so the amount of scattered medicine can be controlled and the quantitative dosing can be maintained, which is beneficial to improving the dosing efficiency and improving the practicality of the device.

[0024] The electric slide rail 787 is turned on to drive the pressing block 788 to move through the internal electronic slider. The pressing block 788 squeezes the first crushing plate 783 when passing through the first crushing plate 783. The first crushing plate 783 pulls the reset spring 785 and slides downward along the limiting slide 782. Then the electronic slider drives the pressing block 788 to move to the top of the second crushing plate 784 and squeezes the second crushing plate 784. The second crushing plate 784 also pulls the reset spring 785 and slides downward along the limiting slide 782. The first crushing plate 783 and the second crushing plate 784 alternately squeeze the sealing plate 77 downward to squeeze and shred the solid medicine on the sealing plate 77 to prevent the solid powder from agglomerating and affecting the uniformity during scattering.

[0025] See also Figure 1-Figure 9In the wastewater thallium removal device described in the embodiments of the present invention, in some embodiments, the diffusion device 79 includes a positioning bracket 791, the top of the positioning bracket 791 is fixedly connected to a driving motor 792, the output end of the driving motor 792 is fixedly connected to a rotating column 793, the outer side of the rotating column 793 is fixedly connected to a support rod 794, the support rod 794 is provided with a sliding opening 795, the inner wall of the sliding opening 795 is connected to a movable block 796 through a spring, the outer side of the support rod 794 is sleeved and slidably connected to a movable sleeve 797, and the outer side of the movable sleeve 797 is fixedly connected to a spiral plate 798.

[0026] Both ends of the positioning bracket 791 are fixedly connected to the side of the dosing cartridge 71 , the output end of the driving motor 792 passes through the positioning bracket 791 and is rotatably connected to the positioning bracket 791 through a bearing, and both ends of the movable block 796 are fixedly connected to the inner wall of the movable sleeve 797 .

[0027] The bottom of the rotating column 793 is fixedly connected to a rotating disk 799, the bottom of the rotating disk 799 is fixedly connected to an electric telescopic rod 7910, the bottom of the electric telescopic rod 7910 is fixedly connected to a moving column 7911, the outer side of the moving column 7911 is fixedly connected to a wave plate 7912, and a drainage hole 7913 is opened on the wave plate 7912.

[0028] There are two groups of wave plates 7912 symmetrically distributed on both sides of the moving column 7911 . There are multiple groups of drainage holes 7913 evenly distributed on the wave plates 7912 .

[0029] When in use, the driving motor 792 is turned on to drive the rotating column 793 to rotate, and the rotating column 793 drives the supporting rod 794 to rotate. The movable sleeve 797 is acted upon by the centrifugal force to drive the movable block 796 to slide along the sliding opening 795 and pull the spring inside the sliding opening 795. During the movement of the movable sleeve 797, the spiral plate 798 is driven to rotate. The spiral plate 798 spreads the powdered agent sprinkled into the dosing tank farther, thereby expanding the spreading range of the powdered agent and improving the efficiency of mixing the powdered agent with wastewater.

[0030] Turn on the electric telescopic rod 7910 to drive the moving column 7911 to move upward, and the moving column 7911 drives the wave plate 7912 to move. During the movement of the wave plate 7912, the liquid at the bottom of the dosing tank is flipped upward, so that the agent can be mixed with the liquid at the bottom of the dosing tank, and the agent and the wastewater in the tank are mixed more evenly.

[0031] For example 2, please refer to Figures 1 to 10 Based on the first embodiment, the present invention further provides a method for removing thallium from wastewater produced by lithium batteries, which specifically includes the following steps: Step S1, the workshop production wastewater is first subjected to defluorination treatment; the wastewater after defluorination is prepared for post-stage thallium removal treatment; Step S2, the wastewater after defluorination in S1 enters the first dosing tank, lime and KMnO4 are added to the first dosing tank, and the pH value is adjusted to between 7 and 10 by adding lime; after the pH value is adjusted, KMnO4 is added to the wastewater with the adjusted pH value in an amount of 100g / m3, and after the addition of KMnO4 is completed, the wastewater after the dosing is subjected to a primary UV oxidation reaction; the time of the primary UV oxidation reaction is 30min; wherein the dosing process includes the following steps: Step a1, open the arc-shaped electric slide rail, and the electric slider inside the arc-shaped electric slide rail drives the sealing plate to rotate around the limit column. Since two groups of sealing plates are provided, the two groups of sealing plates can be synchronously rotated around the limit column under the drive of the electric slider inside the arc-shaped electric slide rail. When the sealing plate rotates, it gradually moves away from the drug discharge port, that is, it no longer blocks the drug discharge port, and the solid medicine filled in the drug cartridge slides out from the drug discharge port along the top of the sealing plate; Step a2, turning on the electric slide rail to drive the pressing block to move through the internal electronic slider, the pressing block squeezes the first crushing plate when passing through the first crushing plate, the first crushing plate pulls the reset spring and slides downward along the limit slide, then the electronic slider drives the pressing block to move to the top of the second crushing plate and squeezes the second crushing plate, the second crushing plate also pulls the reset spring and slides downward along the limit slide, the first crushing plate and the second crushing plate alternately squeeze the sealing plate downward, and squeeze and shred the solid medicine on the sealing plate; Step a3, turn on the driving motor to drive the rotating column to rotate, the rotating column drives the supporting rod to rotate, the moving sleeve is acted upon by the centrifugal force to drive the movable block to slide along the sliding opening and pull the spring inside the sliding opening, the moving sleeve drives the spiral plate to rotate during the movement, and the spiral plate spreads the powder medicine sprinkled into the dosing tank further; Step a4, turning on the electric telescopic rod to drive the moving column to move upward, and the moving column drives the wave plate to move, and the liquid at the bottom of the dosing tank is turned upward during the movement of the wave plate; Step S3, after the first-level UV oxidation reaction is completed, a sufficient amount of PAM is added to the wastewater; after the addition of PAM is completed, the wastewater is subjected to first-level flocculation and precipitation; the clean water after the first-level flocculation and precipitation is discharged into the second dosing tank, KMnO4 is added in an amount of 50g / m3, and after the addition of KMnO4 is completed, the clean water is subjected to second-level oxidation treatment; the oxidation treatment time is 30min; Step S4: After the secondary oxidation treatment is completed, sufficient amount of PAM is added to the wastewater for secondary flocculation precipitation; Step S5, PAC is added to the clean water obtained after the secondary flocculation precipitation in an amount of 10 g / m3; after the addition of PAC is completed, sodium sulfide is added to the clean water in an amount of 15 g / L; after the addition of sodium sulfide is completed, sulfuric acid is added to the clean water to adjust the pH value of the clean water to between 7 and 10; after the pH value is adjusted, sufficient amount of PAM is added to the clean water for tertiary flocculation precipitation; the supernatant obtained after the tertiary flocculation precipitation is filtered.

[0032] Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

Claims

1. A device for removing thallium from wastewater in lithium battery production, characterized in that: It includes a base and a dosing device; A first dosing tank and a second dosing tank are provided on the top of the base, and the first dosing tank and the second dosing tank are connected through a drainage pipe, and a control valve is provided on the drainage pipe. Support frames are provided on the outsides of the first dosing tank and the second dosing tank, and two groups of drainage pipes are provided, and the two groups of drainage pipes are evenly distributed on one side of the first dosing tank; The dosing device is used to add medicine to the first dosing tank and the second dosing tank; the top of the dosing device penetrates the support frame and is fixedly connected to the support frame; The dosing device comprises a dosing cartridge, a limiting column, a crushing device and a diffusion device; the crushing device is used to crush the solid medicine discharged from the dosing cartridge; the diffusion device is used to expand the spreading range of the powder medicine discharged from the dosing cartridge.

2. The device for removing thallium from wastewater in lithium battery production according to claim 1, characterized in that: The dosing device also includes a limiting column; A drug discharge port is provided at the bottom of the drug adding cartridge, a adding pipe is connected to one end of the drug adding cartridge near the top, arc-shaped sliding ports are symmetrically provided at both ends of the drug adding cartridge, and a reinforcement bracket is fixedly connected to the top of the drug adding cartridge; The outer side of the limiting column is rotatably connected to a sealing plate, both sides of the sealing plate are fixedly connected to annular sealing plates, and the side of the annular sealing plate away from the sealing plate is slidably connected to an arcuate electric slide rail through an electric slider, and the electric slider passes through the arcuate sliding opening.

3. The device for removing thallium from wastewater in lithium battery production according to claim 2, characterized in that: The top of the reinforcement bracket passes through the support frame and is fixedly connected to the support frame. Two groups of sealing plates are provided. The two groups of sealing plates are symmetrically distributed on both sides of the limiting column. Both ends of the limiting column are fixedly connected to the inner wall of the drug adding cartridge, and the outer side of the arc-shaped electric slide rail is fixedly connected to the outer wall of the drug adding cartridge.

4. The device for removing thallium from wastewater in lithium battery production according to claim 1, characterized in that: One side of the crushing device is fixedly connected to the outer wall of the drug-adding cylinder, and two groups of the crushing devices are provided, and the two groups of the crushing devices are symmetrically distributed on both sides of the drug-adding cylinder; The crushing device includes a fixed frame, the inner wall of the fixed frame is fixedly connected to a limiting slide, the limiting slides on both sides of the inner wall of the fixed frame are respectively slidably connected to the first crushing plate and the second crushing plate, the tops of the first crushing plate and the second crushing plate are fixedly connected to a reset spring, a rectangular opening is opened on the side of the fixed frame, the top of the inner wall of the rectangular opening is fixedly connected to an electric slide rail, and the electric slide rail is slidably connected to a pressing block.

5. The device for removing thallium from wastewater in lithium battery production according to claim 4, characterized in that: The top of the reset spring is fixedly connected to the top of the inner wall of the fixed frame, and the top of the fixed frame is fixedly connected to the outer wall of the dosing cartridge. Two groups of rectangular openings are provided, and the two groups of rectangular openings are symmetrically distributed on both sides of the fixed frame. The bottom of the pressing block is set as an inclined surface, and the tops of the first crushing plate and the second crushing plate are both set as inclined surfaces.

6. The device for removing thallium from wastewater in lithium battery production according to claim 1, characterized in that: The top of the diffusion device is fixedly connected to the outer side of the drug adding cylinder near the bottom; The diffusion device includes a positioning bracket, the top of the positioning bracket is fixedly connected to a driving motor, the output end of the driving motor is fixedly connected to a rotating column, the outer side of the rotating column is fixedly connected to a support rod, a sliding opening is opened on the support rod, the inner wall of the sliding opening is connected to a movable block through a spring, a movable sleeve is sleeved and slidably connected to the outer side of the support rod, and a spiral plate is fixedly connected to the outer side of the movable sleeve.

7. The device for removing thallium from wastewater in lithium battery production according to claim 6, characterized in that: Both ends of the positioning bracket are fixedly connected to the side of the drug adding cartridge, the output end of the driving motor passes through the positioning bracket and is rotationally connected to the positioning bracket, and both ends of the movable block are fixedly connected to the inner wall of the movable sleeve.

8. The device for removing thallium from wastewater in lithium battery production according to claim 6, characterized in that: The bottom of the rotating column is fixedly connected with a rotating disk, the bottom of the rotating disk is fixedly connected with an electric telescopic rod, the bottom of the electric telescopic rod is fixedly connected with a moving column, the outer side of the moving column is fixedly connected with a wave plate, and the wave plate is provided with drainage holes; The wave plates are provided in two groups, and the two groups of wave plates are symmetrically distributed on both sides of the moving column. The drainage holes are provided in multiple groups, and the multiple groups of drainage holes are evenly distributed on the wave plates.

9. A method for removing thallium from wastewater in lithium battery production based on the wastewater thallium removal device according to any one of claims 1 to 8, characterized in that: The following steps are involved: The wastewater after fluoride removal enters the first dosing tank, lime and KMnO4 are added to the first dosing tank, and the pH value is adjusted to between 7 and 10 by adding lime; after the pH value is adjusted, KMnO4 is added to the wastewater with adjusted pH value at an amount of 100g / m3, and after the addition of KMnO4 is completed, the wastewater after dosing is subjected to a primary UV oxidation reaction; the time of the primary UV oxidation reaction is 30min; After the primary UV oxidation reaction is completed, sufficient amount of PAM is added to the wastewater; after the addition of PAM is completed, the wastewater undergoes primary flocculation and sedimentation; The clean water after the first-level flocculation and sedimentation is discharged into the second dosing tank, and KMnO4 is added at a rate of 50g / m3. After the addition of KMnO4 is completed, the clean water is subjected to secondary oxidation treatment; the oxidation treatment time is 30min; After the secondary oxidation treatment, sufficient amount of PAM is added to the wastewater for secondary flocculation and precipitation; After the secondary flocculation and sedimentation, the clean water obtained was added with PAC at a rate of 10 g / m3; After PAC is added, sodium sulfide is added to the clean water at an amount of 15g / L; after sodium sulfide is added, sulfuric acid is added to the clean water to adjust the pH value of the clean water to between 7 and 10; after the pH value is adjusted, sufficient amount of PAM is added to the clean water for tertiary flocculation precipitation; The supernatant obtained after the third-stage flocculation precipitation is filtered.

10. The method for removing thallium from wastewater according to claim 9, characterized in that: In step S2, the dosing process includes the following steps: a1. Open the arc-shaped electric slide rail, and the electric slider inside the arc-shaped electric slide rail drives the sealing plate to rotate around the limit column. Since two sets of sealing plates are provided, the two sets of sealing plates can rotate synchronously around the limit column under the drive of the electric slider inside the arc-shaped electric slide rail. When the sealing plate rotates, it gradually moves away from the drug discharge port, that is, it no longer blocks the drug discharge port, and the solid medicine filled in the drug cartridge slides out from the drug discharge port along the top of the sealing plate; a2. Turn on the electric slide rail to drive the pressing block to move through the internal electronic slider. When the pressing block passes through the first crushing plate, it squeezes the first crushing plate. The first crushing plate pulls the reset spring and slides down along the limit slide. Then the electronic slider drives the pressing block to move to the top of the second crushing plate and squeezes the second crushing plate. The second crushing plate also pulls the reset spring and slides down along the limit slide. The first crushing plate and the second crushing plate alternately squeeze the sealing plate downward to squeeze and shred the solid medicine on the sealing plate; a3. Turn on the driving motor to drive the rotating column to rotate, and the rotating column drives the supporting rod to rotate. The moving sleeve is acted upon by the centrifugal force to drive the movable block to slide along the sliding opening and pull the spring inside the sliding opening. During the movement of the moving sleeve, the spiral plate is driven to rotate, and the spiral plate spreads the powder medicine thrown into the dosing tank further; a4. Turn on the electric telescopic rod to drive the moving column to move upward, and the moving column drives the wave plate to move. During the movement of the wave plate, the liquid at the bottom of the dosing tank is turned upward.

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