A lithium battery slurry recovery wastewater treatment device

Abstract

The invention relates to the technical field of wastewater treatment, and discloses a lithium battery slurry recovery wastewater treatment device. The lithium battery slurry recovery wastewater treatment method comprises the following steps: S1, collecting the mother liquor generated in the production process of manganese-rich lithium precursor and manganese-rich lithium positive electrode material; S2, adding sodium hydroxide to make the heavy metal substances in the mother liquor form metal ion particle sludge precipitation; S3, injecting the mother liquor added with sodium hydroxide into the filter press for mud and water separation; S4, expanding the filter plate equidistantly through the discharge mechanism, so that the metal ion particle sludge can be quickly separated from the filter plate. The present invention utilizes the mother liquor generated in the production process of high-performance manganese-rich lithium precursor and manganese-rich lithium positive electrode material, as well as the chemical characteristics of metal ions and ammonia in the mother liquor, and adds sodium hydroxide to separate the metal ion particle sludge from the mud and water, and can be repeatedly returned to the synthesis production line, thereby playing a role in comprehensive resource utilization.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and more specifically, to a lithium battery slurry recovery wastewater treatment device. Background Art

[0002] At present, the mother liquor produced in the production process of lithium-ion batteries, especially high-performance manganese-rich lithium precursors and manganese-rich lithium cathode materials, especially in the material synthesis stage, contains a large amount of high-concentration ammonia, nickel, cobalt, manganese, Na2SO4 and others; among which Na2SO4≤140g / L; ammonia≤2g / L; nickel, cobalt, and manganese≤50mg / L respectively. Discharging into the wastewater treatment system not only has high treatment costs and is very difficult to handle, but also leads to waste of resources.

[0003] In the production process of manganese-rich lithium precursor and manganese-rich lithium positive electrode material, the recovery and treatment of wastewater in the mother liquor is an important link, in which a filter press is required to separate the mud and water from the mother liquor. Figure 1 and attached Figure 2 As shown, first plate pulling handles 108a are installed on both sides of the filter plate 107, and a continuous plate pulling device 200 is also provided on the crossbeam 101. During the operation of the filter press 100, the continuous plate pulling device 200 makes reciprocating motion, and cooperates with the pull hooks on the plate pulling device to pull the first plate pulling handles 108a on both sides of the filter plate 107, so that the filter plates 107 are separated piece by piece. However, in actual operation, when the filter plate 107 is separated from the metal ion particle sludge, the operation process is relatively complicated, and the filter plates need to be separated piece by piece. This process has a long cycle and reduces the working efficiency. Summary of the invention

[0004] The present invention provides a lithium battery slurry recovery wastewater treatment device, which solves the technical problem that when separating the filter plate from the metal ion particle sludge in the related technology, the operation process is relatively complicated, the filter plates need to be separated piece by piece, the cycle of this process is long, and the work efficiency is reduced.

[0005] The present invention provides a lithium battery slurry recovery wastewater treatment device, comprising a filter press, the filter press comprising two groups of cross beams, and the two groups of cross beams are connected by two groups of connecting beams, a filter press space is formed between the cross beams and the connecting beams, and a thrust plate and a clamping plate are arranged in the filter press space, and a plurality of filter plates are arranged between the thrust plate and the clamping plate, and also comprises a second pull plate handle, which is installed on both sides of the filter plate; a discharge mechanism is arranged above the filter press space, and the second pull plate handle is driven to move by the discharge mechanism, and a plurality of filter plates are separated equidistantly at the same time; the discharge mechanism comprises a bearing plate, and two groups of second threaded rods are connected to the bearings on the bearing plate, and a transmission shaft is arranged between the two groups of the second threaded rods, and the transmission shaft bearing is connected to the bearing plate On, both ends of the transmission shaft are equipped with first bevel teeth, and the first bevel teeth are meshed with second bevel teeth, the second bevel teeth are installed on the second threaded rod, and the second threaded sleeves are threadedly connected on both sides of the second threaded rod, and two groups of distance limiting blocks are provided between the two groups of the second threaded sleeves, and multiple sliding sleeves are provided between the distance limiting blocks and the second threaded sleeves, and a group of sliding sleeves close to the second threaded sleeves is fixedly connected to the second threaded sleeve; a movable plate is provided under the bearing plate, and adjustment openings are provided on both sides of the movable plate, and multiple locking rods are provided in the adjustment openings, and locking grooves are provided on the locking rods, the middle group of locking rods are installed on the movable plate, and the interiors of the remaining multiple locking rods are slidably connected with traction rods, and the traction rods are respectively installed on the sliding sleeves and the distance limiting blocks.

[0006] As a further optimization scheme of the present invention, the discharging mechanism also includes a supporting frame installed on the crossbeam, and two groups of first threaded rods are connected to bearings on the supporting frame, a motor is also installed on the supporting frame, and the output shaft of the motor is fixedly connected to one of the first threaded rods, the two groups of the first threaded rods are connected by a pulley transmission mechanism, a first threaded sleeve is threadedly connected to the first threaded rod, and a connecting frame is installed between the two first threaded sleeves, and the connecting frame is fixedly connected to the supporting plate.

[0007] As a further optimization scheme of the present invention, every two groups of the sliding sleeves and the distance limit blocks are connected by a distance determining mechanism, and the distance determining mechanism includes a plurality of first limit plates, and a second limit plate is provided on the first limit plate, a second limit groove is opened on the second limit plate, and a locking rod is slidably connected in the second limit groove.

[0008] As a further optimization solution of the present invention, an electric push rod is installed on the bearing plate, and the telescopic end of the electric push rod is fixedly connected to the movable plate.

[0009] As a further optimization scheme of the present invention, a first rack plate is also installed on the carrier frame, and a gear mechanism is meshed and connected on the first rack plate, the gear mechanism includes a connecting disk installed on the transmission shaft, and a first gear is provided on the outside of the connecting disk, and an annular cavity matching the connecting disk is provided inside the first gear, a plurality of locking grooves are also provided on the connecting disk, and a clamping block is slidably connected in the locking groove, and a second spring is installed between the clamping block and the locking groove.

[0010] As a further optimization solution of the present invention, a plurality of buffer slots which are engaged with the card blocks are provided in the annular cavity.

[0011] As a further optimization scheme of the present invention, a second rack plate is also installed on the supporting frame, and a plurality of second gears are meshed and connected on the second rack plate, a first sleeve is installed on the second gear, and the first sleeve is connected to the supporting plate bearing, a spline shaft is slidably connected in the first sleeve, and a second sleeve is also slidably connected on the spline shaft, the second sleeve bearing is connected to the movable plate, and a cam is installed on the spline shaft.

[0012] As a further optimization solution of the present invention, a conical block is installed on the cam, and a third spring is installed between the second sleeve and the cam.

[0013] As a further optimization scheme of the present invention, a sliding groove is provided on the filter plate, and a slider is slidably connected in the sliding groove, and the slider is fixedly connected to the second pull plate handle. A first limiting groove is also provided on the filter plate, and a limiting block is slidably connected in the first limiting groove, and a first spring is installed between the limiting block and the first limiting groove.

[0014] The present invention also provides a method for treating lithium battery slurry recovery wastewater, comprising the following steps:

[0015] S1, collecting the mother liquor generated in the production process of manganese-rich lithium precursor and manganese-rich lithium positive electrode material;

[0016] S2, adding sodium hydroxide to make the heavy metal substances in the mother liquor form metal ion granular sludge precipitation;

[0017] S3, injecting the mother liquor with sodium hydroxide into the filter press to separate mud and water;

[0018] S4, the filter plate is expanded equidistantly through the discharge mechanism, and the filter plate is shaken so that the metal ion granular sludge can be quickly separated from the filter plate;

[0019] S5, the separated metal ion granular sludge enters the anti-dissolution reaction tank, and the supernatant enters the deammoniation system;

[0020] S6. Add sulfuric acid alone into the anti-dissolution reaction tank to restore the metal ion granular sludge;

[0021] S7, returning the recovered metal ions to the production synthesis line for further conditioning and use;

[0022] S8, the separated supernatant liquid enters the negative pressure stripping ammonia recovery system, and the ammonia is recovered by negative pressure high temperature stripping;

[0023] S9. The recovered ammonia is returned to the production synthesis line after the concentration is adjusted.

[0024] The beneficial effects of the present invention are:

[0025] The lithium battery slurry recovery wastewater treatment method utilizes the mother liquor generated in the production process of high-performance manganese-rich lithium precursors and manganese-rich lithium positive electrode materials, as well as the chemical properties of metal ions and ammonia in the mother liquor, and separates the metal ion granular sludge from the mud and water by adding sodium hydroxide, and restores the metal ions by adding sulfuric acid, and then separates the ammonia through a negative pressure stripping ammonia recovery system, so that the separated metal ions and ammonia are not disturbed and can be repeatedly returned to the synthesis production line, thereby playing a role in comprehensive resource utilization.

[0026] The present invention can shake multiple groups of filter plates at the same time by spreading the filter plates in batches at equal intervals, so that the metal ion granular sludge can be quickly separated from the filter plates, thereby increasing the separation rate between the metal ion granular sludge and the filter plates, and effectively solving the problem that when separating the filter plates from the metal ion granular sludge, the operation process is relatively complicated and the filter plates need to be separated piece by piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the prior art structure of the present invention;

[0028] Figure 2 The present invention Figure 1 Schematic diagram of the structure at A in the middle;

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the discharging mechanism of the first embodiment of the present invention;

[0031] Figure 5 It is the embodiment of the present invention. Figure 4 Schematic diagram of the structure at B in the middle;

[0032] Figure 6 It is a schematic diagram of the partial structure of the discharging mechanism of the first embodiment of the present invention;

[0033] Figure 7 is a schematic cross-sectional view of the first rack plate and the gear mechanism structure of the first embodiment of the present invention;

[0034] Figure 8 The structure of the load-bearing plate of the first embodiment of the present invention is shown in FIG. Figure 1 ;

[0035] Fig. 9 The structure of the load-bearing plate of the first embodiment of the present invention is shown in FIG. Figure 2 ;

[0036] Fig.10 It is the embodiment of the present invention. Fig. 9 Schematic diagram of the structure at C in the middle;

[0037] Fig.11 It is the embodiment of the present invention. Fig. 9 Schematic diagram of the structure at D in the middle;

[0038] Fig.12 It is a schematic diagram of the explosion structure of the connection between the filter plate and the second pull plate handle in the first embodiment of the present invention;

[0039] Fig.13 It is a schematic diagram of the discharging state structure of the first embodiment of the present invention;

[0040] Fig.14 It is a schematic diagram of the flow chart of the second embodiment of the present invention.

[0041] In the figure: 100, filter press; 101, crossbeam; 102, thrust plate; 103, pressing plate; 104, hydraulic cylinder; 105, supernatant discharge groove; 106, discharge pipe; 107, filter plate; 1071, slide groove; 1072, slider; 1073, limit block; 1074, first limit groove; 1075, first spring; 108a, first pull plate handle; 108b, second pull plate handle; 109, filter chamber; 110, liquid flow port; 111, liquid outlet; 112, gate; 200, continuous pull plate device; 300, discharge mechanism; 301, carrier frame; 302, first threaded rod; 303, motor; 304, pulley transmission mechanism; 305, first threaded sleeve; 306, connecting frame; 307, carrier plate; 3071, distance plate; 3072, distance block; 3 08, second threaded rod; 309, transmission shaft; 310, first bevel gear; 311, second bevel gear; 312, second threaded sleeve; 313, sliding sleeve; 314, first limit plate; 315, second limit plate; 316, second limit groove; 317, locking rod; 318, traction rod; 319, locking rod; 320, locking groove; 321, movable plate; 322, slide; 323, electric push rod; 324, first rack plate; 325, gear mechanism; 3251, connecting plate; 3252, first gear; 3253, annular cavity; 3254, block; 3255, second spring; 326, second rack plate; 327, second gear; 328, first sleeve; 329, spline shaft; 330, second sleeve; 331, cam; 332, conical block; 333, third spring. DETAILED DESCRIPTION

[0042] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0043] Embodiment 1: According to the attached Figure 1 To Attachment Figure 5As shown, a lithium battery slurry recovery wastewater treatment device includes a filter press 100, which includes two groups of cross beams 101, and the two groups of cross beams 101 are connected by two groups of connecting beams, and a filter pressing space is formed between the cross beams 101 and the connecting beams, and a thrust plate 102 and a clamping plate 103 are provided in the filter pressing space. Specifically, one of the connecting beams is fixedly connected to the thrust plate 102, and a hydraulic cylinder 104 is installed on the other connecting beam, and the telescopic end of the hydraulic cylinder 104 is fixedly connected to the clamping plate 103. When the hydraulic cylinder 104 extends, the clamping plate 103 moves toward the setting direction of the thrust plate 102, and when the hydraulic cylinder 104 retracts, the clamping plate 103 moves away from the setting direction of the thrust plate 102.

[0044] Among them, multiple filter plates 107 are also arranged between the thrust plate 102 and the clamping plate 103. When the clamping plate 103 moves toward the setting direction of the thrust plate 102, the clamping plate 103 applies pressure to the filter plates 107. Through the coordinated movement of the thrust plate 102 and the clamping plate 103, the filter plates 107 are compressed.

[0045] More specifically, a filter cavity 109 is provided on the filter plate 107, and a liquid flow port 110 is provided in the filter cavity 109. An injection pipe corresponding to the position of the liquid flow port 110 is installed on the thrust plate 102. During the filtration process, the mother liquor added with sodium hydroxide is injected into the filter press 100 through the injection pipe for mud-water separation. The metal ion particle sludge precipitation is filtered through the filter plate 107, and the setting of the filter cavity 109 can provide a temporary retention space for the filtered metal ion particle sludge.

[0046] In addition, the filter press 100 also includes a supernatant discharge trough 105, and a discharge pipe 106 is installed on the supernatant discharge trough 105. A liquid outlet 111 is also opened on the filter plate 107, and the liquid outlet 111 corresponds to the position of the supernatant discharge trough 105. Through the arrangement of the filter plate 107 and the filter chamber 109, the metal ion particle sludge is separated from the water, and the supernatant filtered by the filter plate 107 is discharged to the outside through the liquid outlet 111, and the supernatant is received by the supernatant discharge trough 105, and the supernatant enters the negative pressure stripping ammonia recovery system through the discharge pipe 106, and the ammonia is recovered by negative pressure high temperature stripping.

[0047] A gate plate 112 is provided below the filter press space. When the gate plate 112 is in a closed state, the seeped supernatant can be received and introduced into the supernatant discharge tank 105. When the gate plate 112 is in an open state, the solid metal ion particle sludge in the filter chamber 109 can be separated by the filter plates 107, and the metal ion particle sludge can be transported to the anti-dissolution reaction tank by providing a conveyor belt device below the filter press 100.

[0048] A second pull plate handle 108b is installed on both sides of the filter plate 107, and a discharge mechanism 300 is provided above the filter press space. The second pull plate handle 108b is driven to move by the discharge mechanism 300, and multiple groups of filter plates 107 are separated at equal distances at the same time, so as to facilitate the cleaning of the metal ion particle sludge in the filter chamber 109 and transfer the metal ion particle sludge to the anti-dissolution reaction tank.

[0049] According to the attached Figure 6 To Attachment Fig. 9 and attached Fig.13 As shown, the discharge mechanism 300 includes a carrier frame 301 installed on the beam 101, and two groups of first threaded rods 302 are connected to the bearings on the carrier frame 301, a motor 303 is also installed on the carrier frame 301, and the output shaft of the motor 303 is fixedly connected to one of the first threaded rods 302, the two groups of first threaded rods 302 are connected by a pulley transmission mechanism 304, the first threaded rod 302 is threadedly connected with a first threaded sleeve 305, and a connecting frame 306 is installed between the two first threaded sleeves 305, and a bearing plate 307 is installed on the connecting frame 306.

[0050] When the supporting plate 307 needs to be driven to move, the motor 303 is controlled to rotate, and under the connection of the pulley transmission mechanism 304, the two groups of first threaded rods 302 are driven to rotate synchronously, so that the first threaded sleeve 305 moves outside the first threaded rod 302, thereby driving the supporting plate 307 to move.

[0051] Specifically, two groups of second threaded rods 308 are connected to the bearings on the supporting plate 307, and a transmission shaft 309 is provided between the two groups of second threaded rods 308. The transmission shaft 309 is connected to the supporting plate 307 by bearings. First bevel gears 310 are installed at both ends of the transmission shaft 309, and the first bevel gears 310 are meshed with second bevel gears 311. The second bevel gears 311 are installed on the second threaded rods 308, and second threaded sleeves 312 are threadedly connected on both sides of the second threaded rods 308. Through the meshing connection between the first bevel gears 310 and the second bevel gears 311, when the transmission shaft 309 rotates, the second threaded rods 308 on both sides rotate synchronously, thereby driving the second threaded sleeves 312 on the second threaded rods 308 to move.

[0052] Among them, two groups of distance limiting blocks 3072 are also arranged between the two groups of second threaded sleeves 312, and multiple sliding sleeves 313 are arranged between the distance limiting blocks 3072 and the second threaded sleeves 312. A group of sliding sleeves 313 close to the second threaded sleeve 312 is fixedly connected to the second threaded sleeve 312, and every two groups of sliding sleeves 313 and the distance limiting blocks 3072 are connected by a distance mechanism.

[0053] According to the attached Figure 8 and attached Fig.10As shown, the spacing mechanism includes a plurality of first limiting plates 314 , and a second limiting plate 315 is provided on the first limiting plate 314 , a second limiting groove 316 is formed on the second limiting plate 315 , and a locking rod 317 is slidably connected in the second limiting groove 316 .

[0054] It should be understood that when the second threaded sleeve 312 moves outside the second threaded rod 308, the second threaded sleeve 312 drives the plurality of sliding sleeves 313 and the distance block 3072 to move through the distance-fixing mechanism, and the second limiting groove 316 and the locking rod 317 are arranged so that the second threaded sleeve 312 drives the sliding sleeve 313 and the distance block 3072 to a position equal to the sliding distance of the locking rod 317 in the limiting groove. When the second threaded sleeve 312 drives the plurality of sliding sleeves 313 and the distance block 3072 to move, the distance between every two sliding sleeves 313 and the distance between the sliding sleeve 313 and the distance block 3072 is the same.

[0055] It should be noted that, except for one set of sliding sleeves 313 fixedly connected to the second threaded sleeve 312, the remaining sliding sleeves 313 and the distance block 3072 are all fixedly connected to the first limit plate 314. Among them, except for the distance block 3072, all sliding sleeves 313 are fixedly connected to the second limit plate 315.

[0056] A movable plate 321 is provided below the supporting plate 307, and adjustment openings are provided on both sides of the movable plate 321. A plurality of locking rods 319 are provided in the adjustment openings, and locking grooves 320 are provided on the locking rods 319. A middle group of locking rods 319 is installed on the movable plate 321, and the interiors of the remaining locking rods 319 are all slidably connected with traction rods 318, and the traction rods 318 are respectively installed on the sliding sleeve 313 and the distance limit block 3072. A plurality of slides 322 are slidably connected in the adjustment openings, and the slides 322 are fixedly connected to the locking rods 319 slidably connected to the traction rods 318. An electric push rod 323 is installed on the supporting plate 307, and the telescopic end of the electric push rod 323 is fixedly connected to the movable plate 321.

[0057] When the distance between every two sleeves 313 and the distance between the sleeves 313 and the distance limit block 3072 are the same, the moving distance between the traction rods 318 is also the same, so that the locking rod 319 is adjusted equidistantly, and the electric push rod 323 is telescopically moved to drive the movable plate 321 to move up and down, so that the electric push rod 323 drives the locking groove 320 to limit the two sides of the second pull plate handle 108b. At this time, the locking groove 320 is not completely in contact with the second pull plate handle 108b, but only limits the outside of the second pull plate handle 108b through the side of the locking groove 320, and the filter plate 107 is adjusted equidistantly through the equidistant movement of the locking rod 319, which is convenient for releasing the limit of the metal ion particle sludge and facilitating the separation of the metal ion particle sludge.

[0058] Two sets of distance limiting plates 3071 are also installed in the adjustment opening to limit the two sets of traction rods 318 in the middle. By setting the distance limiting plates 3071, the moving position of the distance limiting blocks 3072 can be restricted, thereby facilitating equidistant adjustment of the traction rods 318.

[0059] According to the attached Figure 7 As shown, a first rack plate 324 is also installed on the carrier frame 301, and a gear mechanism 325 is meshedly connected to the first rack plate 324, the gear mechanism 325 includes a connecting disk 3251 installed on the transmission shaft 309, and a first gear 3252 is provided on the outside of the connecting disk 3251, and an annular cavity 3253 matched with the connecting disk 3251 is provided inside the first gear 3252, and a plurality of locking grooves are also provided on the connecting disk 3251, and a card block 3254 is slidably connected in the locking groove, a second spring 3255 is installed between the card block 3254 and the locking groove, and a plurality of buffer snap-in sockets engaged with the card block 3254 are provided in the annular cavity 3253.

[0060] It should be noted that the two side edges of the buffer bayonet and the block 3254 are both inclined. When the first gear 3252 cannot drive the connecting disk 3251 to rotate, the first gear 3252 drives the buffer bayonet to move outside the connecting disk 3251, so that the buffer bayonet squeezes the block 3254, and the block 3254 shrinks into the lock groove, so that the first gear 3252 can rotate outside the connecting disk 3251, and the meshing connection between the first gear 3252 and the first rack plate 324 is buffered to avoid movement limitation, so that the filter plate 107 can translate normally.

[0061] According to the attached Figure 6 , Attachment Figure 8 , Attachment Fig. 9 and attached Fig.11 As shown, a second rack plate 326 is also installed on the carrier frame 301, and a plurality of second gears 327 are meshedly connected to the second rack plate 326, a first sleeve 328 is installed on the second gear 327, and the first sleeve 328 is bearing-connected to the carrier plate 307, a spline shaft 329 is slidably connected in the first sleeve 328, and a second sleeve 330 is also slidably connected to the spline shaft 329, the second sleeve 330 is bearing-connected to the movable plate 321, a cam 331 is installed on the spline shaft 329, and a conical block 332 is installed on the cam 331, and a third spring 333 is installed between the second sleeve 330 and the cam 331.

[0062] Among them, through the setting of the spline shaft 329, the spline shaft 329 can move up and down between the first sleeve 328 and the second sleeve 330, and through the setting of the conical block 332, when the filter plate 107 moves, the top of the filter plate 107 will contact the conical block 332, thereby squeezing the edge of the conical block 332, so that the cam 331 squeezes the third spring 333 when being squeezed, so that the cam 331 moves upward, which facilitates the displacement of the filter plate 107 and avoids obstruction to the displacement of the filter plate 107.

[0063] When the filter plates 107 are adjusted equidistantly, the distance between every two filter plates 107 is equal, so that a discharge space is formed between every two filter plates 107. It should be noted that the position of the cam 331 is aligned with the position of the discharge space, so that after the filter plates 107 are adjusted equidistantly, the cam 331 moves toward the discharge space under the action of the restoring force of the third spring 333, and drives the movable plate 321 downward again through the electric push rod 323, so that the locking groove 320 is completely limited by the second pull plate handle 108b, so that the cam 331 is in the discharge space, and is meshed with the second gear 327 through the second rack plate 326, so that the cam 331 rotates, so that the two protruding edges of the cam 331 contact the filter plates 107, and the cam 331 drives the filter plates 107 to shake, so that the metal ion particle sludge falls quickly.

[0064] According to the attached Fig.12 As shown, a slide groove 1071 is provided on the filter plate 107, and a slider 1072 is slidably connected in the slide groove 1071, and the slider 1072 is fixedly connected to the second pull plate handle 108b. A first limiting groove 1074 is also provided on the filter plate 107, and a limiting block 1073 is slidably connected in the first limiting groove 1074, and a first spring 1075 is installed between the limiting block 1073 and the first limiting groove 1074. Through the setting of the first spring 1075, the filter plate 107 is convenient to shake under the action of the first spring 1075 during the rotation of the cam 331, so as to better separate the metal ion particle sludge.

[0065] Embodiment 2: According to the attached Fig.14 As shown, a lithium battery slurry recovery wastewater treatment method recycles the mother liquor generated in the production process of manganese-rich lithium precursor and manganese-rich lithium positive electrode material, separates the metal ions and ammonia water in the mother liquor, so that the separated metal ions can be returned to the production synthesis line after reverse dissolution, and the recovered ammonia water is configured to a suitable concentration and returned to the production synthesis line, which plays a role in comprehensive resource utilization. The steps are as follows:

[0066] S1, collecting the mother liquor generated in the production process of manganese-rich lithium precursor and manganese-rich lithium positive electrode material;

[0067] S2. Sodium hydroxide is added to make the heavy metal substances in the mother liquor form metal ion granular sludge precipitation. The dosage is controlled by pH, so that heavy metals such as nickel, cobalt, and manganese in the mother liquor form metal ion granular sludge precipitation. Among them, the metal ion precipitation rate is 99%;

[0068] S3, injecting the mother liquor with sodium hydroxide added into the filter press 100 for mud-water separation;

[0069] S4, the filter plate 107 is expanded equidistantly by the discharge mechanism 300, and the filter plate 107 is shaken, so that the metal ion granular sludge can be quickly separated from the filter plate 107;

[0070] S5, the separated metal ion granular sludge enters the anti-dissolution reaction tank, and the supernatant enters the deammoniation system;

[0071] S6. Sulfuric acid is added separately to the anti-dissolution reaction tank to restore the metal ion granular sludge; the amount of addition is controlled by pH, and the metal granular sludge is anti-dissolved to its original state;

[0072] S7, returning the recovered metal ions to the production synthesis line for further conditioning and use;

[0073] S8. The separated supernatant enters the negative pressure stripping ammonia recovery system. The ammonia is recovered by negative pressure and high temperature stripping without adding any external reagents. Only negative pressure and high temperature are used. The ammonia recovery rate can reach 99%;

[0074] S9. The recovered ammonia is returned to the production synthesis line after the concentration is adjusted.

[0075] An example of the present specific implementation mode is described above, but the present embodiment is not limited to the above-mentioned specific implementation mode, which is merely illustrative and not restrictive. A person skilled in the art may make many forms inspired by the present embodiment, all of which are protected by the present embodiment.

Claims

1. A lithium battery slurry recovery wastewater treatment device, comprising a filter press (100), the filter press (100) comprising two groups of cross beams (101), the two groups of cross beams (101) being connected via two groups of connecting beams, a filter press space being formed between the cross beams (101) and the connecting beams, a thrust plate (102) and a pressing plate (103) being provided in the filter press space, a plurality of filter plates (107) being further provided between the thrust plate (102) and the pressing plate (103), It is characterized in that Also includes: A second plate pulling handle (108b) is installed on both sides of the filter plate (107); A discharge mechanism (300) is arranged above the filter pressing space, and the discharge mechanism (300) drives the second plate pulling handle (108b) to move, thereby separating the plurality of groups of filter plates (107) at equal distances. The discharging mechanism (300) comprises a bearing plate (307), two groups of second threaded rods (308) are connected to the bearing plate (307), and a transmission shaft (309) is arranged between the two groups of second threaded rods (308), the transmission shaft (309) is connected to the bearing plate (307), both ends of the transmission shaft (309) are installed with first bevel gears (310), and the first bevel gears (310) are meshingly connected to the second bevel gears (311), and the The second bevel gear (311) is mounted on the second threaded rod (308), and the second threaded sleeves (312) are threadedly connected to both sides of the second threaded rod (308), two groups of distance limiting blocks (3072) are provided between the two groups of the second threaded sleeves (312), and a plurality of sliding sleeves (313) are provided between the distance limiting blocks (3072) and the second threaded sleeves (312), and a group of sliding sleeves (313) close to the second threaded sleeves (312) is fixedly connected to the second threaded sleeves (312); A movable plate (321) is provided below the bearing plate (307), and adjustment openings are provided on both sides of the movable plate (321), a plurality of locking rods (319) are provided in the adjustment openings, and locking grooves (320) are provided on the locking rods (319), a middle group of the locking rods (319) is mounted on the movable plate (321), and the interiors of the remaining plurality of the locking rods (319) are all slidably connected with traction rods (318), and the traction rods (318) are respectively mounted on the sliding sleeve (313) and the distance limit block (3072); The discharge mechanism (300) further comprises a support frame (301) mounted on the crossbeam (101), and two groups of first threaded rods (302) are connected to bearings on the support frame (301), a motor (303) is also mounted on the support frame (301), and an output shaft of the motor (303) is fixedly connected to one of the first threaded rods (302), the two groups of the first threaded rods (302) are connected via a pulley transmission mechanism (304), a first threaded sleeve (305) is threadedly connected to the first threaded rod (302), and a connecting frame (306) is mounted between the two first threaded sleeves (305), and the connecting frame (306) is fixedly connected to the support plate (307); Every two groups of the sliding sleeves (313) and the distance blocks (3072) are connected via a distance-fixing mechanism, wherein the distance-fixing mechanism comprises a plurality of first limit plates (314), wherein a second limit plate (315) is provided on the first limit plate (314), wherein a second limit groove (316) is formed on the second limit plate (315), and a locking rod (317) is slidably connected in the second limit groove (316); The carrier frame (301) is also mounted with a second rack plate (326), and the second rack plate (326) is meshedly connected with a plurality of second gears (327), the second gears (327) are mounted with a first shaft sleeve (328), and the first shaft sleeve (328) is bearing-connected to the carrier plate (307), a spline shaft (329) is slidably connected in the first shaft sleeve (328), and a second shaft sleeve (330) is slidably connected to the spline shaft (329), the second shaft sleeve (330) is bearing-connected to the movable plate (321), and a cam (331) is mounted on the spline shaft (329); A conical block (332) is installed on the cam (331), and a third spring (333) is installed between the second shaft sleeve (330) and the cam (331); The filter plate (107) is provided with a slide groove (1071), and a slider (1072) is slidably connected in the slide groove (1071), and the slider (1072) is fixedly connected to the second pull plate handle (108b). The filter plate (107) is also provided with a first limiting groove (1074), and a limiting block (1073) is slidably connected in the first limiting groove (1074), and a first spring (1075) is installed between the limiting block (1073) and the first limiting groove (1074).

2. A lithium battery slurry recovery wastewater treatment device according to claim 1, It is characterized in that An electric push rod (323) is installed on the bearing plate (307), and the telescopic end of the electric push rod (323) is fixedly connected to the movable plate (321).

3. A lithium battery slurry recovery wastewater treatment device according to claim 1, It is characterized in that The support frame (301) is also provided with a first rack plate (324), and the first rack plate (324) is meshingly connected with a gear mechanism (325), the gear mechanism (325) comprising a connecting disk (3251) installed on the transmission shaft (309), and a first gear (3252) is provided on the outside of the connecting disk (3251), and an annular cavity (3253) matching the connecting disk (3251) is provided on the inside of the first gear (3252), and a plurality of locking grooves are also provided on the connecting disk (3251), and a clamping block (3254) is slidably connected in the locking groove, and a second spring (3255) is installed between the clamping block (3254) and the locking groove.

4. A lithium battery slurry recovery wastewater treatment device according to claim 3, It is characterized in that A plurality of buffer snap-in openings which are snap-connected with the snap-in blocks (3254) are provided in the annular cavity (3253).

5. A method for treating wastewater from lithium battery slurry recovery, using a lithium battery slurry recovery wastewater treatment device as described in any one of claims 1 to 4, It is characterized in that The steps include: S1, collecting the mother liquor generated in the production process of manganese-rich lithium precursor and manganese-rich lithium positive electrode material; S2, adding sodium hydroxide to make the heavy metal substances in the mother liquor form metal ion particle sludge precipitation; S3, injecting the mother liquor to which sodium hydroxide has been added into the filter press (100) for mud-water separation; S4, expanding the filter plate (107) equidistantly by means of the discharge mechanism (300), and shaking the filter plate (107), so that the metal ion granular sludge can be quickly separated from the filter plate (107); S5, the separated metal ion granular sludge enters the anti-dissolution reaction tank, and the supernatant enters the deammoniation system; S6. Add sulfuric acid alone into the anti-dissolution reaction tank to restore the metal ion granular sludge; S7, returning the recovered metal ions to the production synthesis line for further conditioning and use; S8, the separated supernatant liquid enters the negative pressure stripping ammonia recovery system, and the ammonia is recovered by negative pressure high temperature stripping; S9. The recovered ammonia is returned to the production synthesis line after the concentration is adjusted.

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