Wastewater treatment device for lithium carbonate production

Abstract

The utility model relates to the related technical field of wastewater treatment, especially lithium carbonate production's wastewater treatment device, including processing box, sealing cover, baffle, adjusting pool and sedimentation tank, first feeding pipe, second feeding pipe, wastewater inlet pipe, conveying pipeline, stirring component, filter assembly, sludge pump, surplus material recovery unit and controller. Lithium carbonate production's wastewater treatment device of the utility model, the untreated wastewater first enters the adjusting pool, and here through the improvement water quality of putting in medicament, stirring and adjusting pH value, then through conveying pipeline and is transported to the sedimentation tank, adds coagulant and coagulation aid in the sedimentation tank and promotes suspended solid to deposit, finally separates out solid and liquid through filter assembly and sludge pump, realizes the efficient treatment of wastewater and the recovery of solid salt.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment, and in particular to a wastewater treatment device for lithium carbonate production. Background Technology

[0002] The production of lithium carbonate generates large amounts of highly saline wastewater containing harmful components such as lithium, sodium, sulfates, and heavy metals. Direct discharge of this wastewater will cause long-term and severe environmental pollution. These harmful substances not only damage aquatic ecosystems but also pollute land and groundwater, affecting the balance of ecosystems and human health.

[0003] Currently, common methods for treating lithium carbonate production wastewater include chemical precipitation, membrane separation, and evaporation crystallization. However, these methods have significant limitations. While chemical precipitation can effectively remove certain harmful components, its treatment efficiency is generally low and it may cause secondary pollution. Membrane separation, although achieving high separation efficiency, has high operating costs, and the membrane material is easily clogged by contaminants, affecting the stable operation of the equipment. Evaporation crystallization can recover some water resources, but it requires a large amount of heat energy, resulting in high energy consumption, and the equipment is prone to scaling over long periods of operation, increasing maintenance costs. Therefore, there is an urgent need for a new type of lithium carbonate production wastewater treatment device that integrates high-efficiency treatment, energy-saving operation, and equipment stability. Utility Model Content

[0004] This invention solves the problems in related technologies and proposes a wastewater treatment device for lithium carbonate production. Untreated wastewater first enters an equalization tank, where the water quality is improved by adding chemicals, stirring, and adjusting the pH value. Then, it is transported to a sedimentation tank through a pipeline. In the sedimentation tank, coagulants and flocculants are added to promote the sedimentation of suspended solids. Finally, the solids and liquids are separated by a filter assembly and a sludge pump, achieving efficient wastewater treatment and solid salt recovery.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: a wastewater treatment device for lithium carbonate production, including a treatment tank, a sealing cover plate hinged to the upper end face of the treatment tank, a partition plate disposed in the treatment tank, the partition plate dividing the treatment tank into an equalization tank and a sedimentation tank, a first feeding pipe penetrating through the sealing cover plate and communicating with the equalization tank, a second feeding pipe penetrating through the sealing cover plate and communicating with the sedimentation tank, a wastewater inlet pipe disposed on one side of the equalization tank, a conveying pipe disposed in the equalization tank and communicating with the sedimentation tank, a stirring component disposed in the equalization tank, a filter assembly disposed in the sedimentation tank, a sludge pump in the lower part of the sedimentation tank, a residual material recovery unit communicating with the sedimentation tank, and a controller fixedly disposed on the outside of the treatment tank.

[0006] By adopting the above technical solution, untreated wastewater first enters the equalization tank, where the water quality is improved by adding chemicals, stirring, and adjusting the pH value. Then, it is transported to the sedimentation tank through a pipeline, where coagulants and flocculants are added to promote the sedimentation of suspended solids. Finally, the solids and liquids are separated by a filter assembly and a sludge pump, achieving efficient wastewater treatment and solid salt recovery.

[0007] As a preferred embodiment, one end of the conveying pipe is in contact with the lower end face of the inner cavity of the regulating tank, and the other end of the conveying pipe is connected to the upper end face of the inner cavity of the sedimentation tank.

[0008] By adopting the above technical solution, the equalization tank is connected to one end of the conveying pipeline via its lower inner surface, while the other end of the conveying pipeline is connected to the upper inner surface of the sedimentation tank. A booster pump is installed on the conveying pipeline. The equalization tank receives untreated wastewater and adjusts its pH value by adding chemicals and stirring to improve water quality. The booster pump pressurizes the wastewater in the equalization tank and conveys it to the sedimentation tank, ensuring efficient wastewater transfer. The sedimentation tank provides space for wastewater sedimentation and removal of suspended solids.

[0009] As a preferred embodiment, the stirring component includes a stirring shaft disposed in the regulating tank, a stirring motor connected to the stirring shaft, and an ultrasonic generator disposed in the regulating tank. Both ends of the stirring shaft are connected to the regulating tank and are provided with sealed bearings. The stirring motor is fixedly disposed on the outside of the regulating tank, and the output shaft of the stirring motor is connected to the stirring shaft.

[0010] By adopting the above technical solution, the stirring shaft is responsible for rotating inside the equalization tank, driving the mixing of wastewater and modified agents; the stirring motor provides power, driving the stirring shaft to rotate through its output shaft, ensuring that the wastewater and agents can be fully mixed; the ultrasonic generator further enhances the mixing efficiency of wastewater and modified agents by generating ultrasonic waves. Sealed bearings are fixed at both ends of the stirring shaft to ensure that the stirring shaft can rotate smoothly inside the equalization tank while maintaining a seal.

[0011] As a preferred embodiment, the ultrasonic generator is fixedly installed in the inner cavity of the regulating tank, and the ultrasonic generator is positioned relative to the stirring shaft.

[0012] By adopting the above technical solution, the ultrasonic generator generates high-frequency sound waves in the equalization tank, which enhances the shear force between the stirring shaft and the wastewater, effectively preventing impurity deposition; the stirring shaft is responsible for stirring in the equalization tank, promoting full contact between the wastewater and the ultrasonic waves.

[0013] As a preferred embodiment, the system also includes a pH monitor installed in the equalization tank, wherein the signal output terminal of the pH monitor is electrically connected to the signal input terminal of the controller.

[0014] By adopting the above technical solution, the pH value in the equalization tank is monitored in real time, and the detection results are transmitted to the controller via signal. Furthermore, the controller, as the core of information processing, receives the pH data transmitted by the pH monitor and performs feedback control accordingly to maintain a stable pH value in the equalization tank. The working principle is as follows: the pH monitor continuously detects the pH value in the equalization tank and transmits the data signal to the controller. After receiving the pH information, the controller adjusts the feeding amount in the first feeding pipe and the speed of the stirring motor.

[0015] As a preferred embodiment, the filtration assembly includes an inclined sedimentation filter plate in the upper part of the sedimentation tank and a multi-stage filtration unit slidably disposed on the lower end face of the sedimentation filter plate, wherein the sedimentation filter plate is provided with fiber packing.

[0016] By adopting the above technical solution, the sewage is first poured onto the inclined sedimentation filter plate, where it is further settled and filtered by the fiber packing material on the filter plate. Then, it is filtered step by step through the sliding multi-stage filtration unit to finally achieve the purpose of purification, thereby realizing the efficient purification of sewage.

[0017] As a preferred embodiment, the multi-stage filtration unit is slidably connected to the sedimentation tank. The multi-stage filtration unit is configured in the sedimentation order as a quartz sand filter, an activated carbon filter, and a precision filter. The main function of the quartz sand filter is to remove suspended particulate matter from the water, intercepting larger particles and suspended solids through the quartz sand filter layer. The activated carbon filter is responsible for removing organic pollutants and some dissolved organic matter from the water, utilizing the porous structure and adsorption capacity of activated carbon to adsorb organic matter. The precision filter is mainly used to further remove fine impurities and particles from the water, ensuring the purity of the effluent.

[0018] As a preferred embodiment, the waste recovery unit includes a discharge pipe connected to the lower end face of the sedimentation tank, an electrodialysis device connected to the discharge pipe, a reverse osmosis membrane module connected to the electrodialysis device, an evaporation crystallization unit connected to the reverse osmosis membrane module, a first connecting pipe disposed between the electrodialysis device and the reverse osmosis membrane module, a second connecting pipe disposed between the reverse osmosis module and the evaporation crystallization unit, and a third connecting pipe disposed between adjacent evaporation crystallization units. The electrodialysis device includes a membrane stack composed of a monovalent selective cation exchange membrane and an antifouling anion exchange membrane, and a microfiltration pretreatment unit disposed on the membrane stack. The concentrate outlet of the electrodialysis device is connected to a lithium extraction system through an external pipe, and the desalination outlet of the electrodialysis device is connected to the reverse osmosis membrane module through the first connecting pipe.

[0019] By adopting the above technical solution, the discharge pipeline is used to discharge wastewater from the sedimentation tank and transmit it to the electrodialysis unit for preliminary treatment. The electrodialysis unit effectively separates lithium ions and sodium ions through a membrane stack composed of monovalent selective cation exchange membranes (such as CSO membranes) and antifouling anion exchange membranes, as well as a microfiltration pretreatment unit, thereby improving lithium recovery efficiency. The concentrated solution from the electrodialysis is connected to the lithium extraction system through an external pipeline, while the desalinated solution is transmitted to the reverse osmosis membrane module through the first connecting pipeline, reducing the salinity of the wastewater, alleviating the burden on the subsequent reverse osmosis membrane module, and extending the membrane's service life.

[0020] As a preferred option, the reverse osmosis membrane module uses an anti-fouling RO membrane.

[0021] By adopting the above technical solution, the salt content in the wastewater is further concentrated, the concentrate is returned to the evaporation and crystallization system, and the produced water can meet the reuse standards, and the salinity of the discharged water is greatly reduced.

[0022] As a preferred embodiment, the evaporation crystallization unit includes an MVR evaporator and a centrifugal crystallizer.

[0023] By adopting the above technical solution, salts such as sodium sulfate and lithium carbonate can be separated and recovered, achieving efficient and energy-saving salt recovery. The entire system, through multi-stage treatment, realizes the effective utilization of wastewater, reduces the separation cost of salts and lithium, improves recovery efficiency, and finally transports the high-lithium concentrate from the wastewater to the lithium extraction process, while the low-salt freshwater is reused or safely discharged.

[0024] Compared with the prior art, the beneficial effects of this utility model are: This utility model;

[0025] A partition divides the treatment tank into an equalization tank and a sedimentation tank, achieving zoning of the wastewater treatment process. The equalization tank receives untreated wastewater through a wastewater inlet pipe and homogenizes it using a stirring component, adjusting the pH to neutral or slightly alkaline to facilitate subsequent chemical reactions. Modifying agents are added through the first feeding pipe, where the stirring component further mixes the wastewater evenly, improving the wastewater treatment efficiency.

[0026] The conveying pipeline connects the equalization tank and the sedimentation tank, introducing the treated wastewater into the sedimentation tank for further treatment. The second feeding pipe is used to add coagulants (such as PAC) and flocculants (such as PAM) to the sedimentation tank, forming flocs with the suspended solids in the wastewater and enhancing the sedimentation effect. The filtration components in the sedimentation tank further separate the suspended solids in the wastewater.

[0027] The sludge pump draws the settled sludge into a filter press for dewatering, while the residual material recovery unit at the bottom of the sedimentation tank recovers the separated solid salts, including lithium salts, sodium sulfate, and lithium carbonate. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the wastewater treatment device for lithium carbonate production according to this utility model.

[0029] Figure 2 This is a schematic diagram of the internal structure of the wastewater treatment device for lithium carbonate production according to this utility model.

[0030] Figure 3 This is a partial half-sectional view of the wastewater treatment device for lithium carbonate production according to this utility model.

[0031] Figure 4 This utility model relates to a wastewater treatment device for lithium carbonate production. Figure 3 A structural schematic diagram of the front view.

[0032] In the picture:

[0033] 1. Treatment tank; 10. Wastewater inlet pipe; 2. Sealing cover; 21. First feed pipe; 22. Second feed pipe; 3. Baffle; 31. Equalization tank; 32. Sedimentation tank; 4. Conveying pipe; 51. Stirring shaft; 511. Stirring motor; 52. Ultrasonic generator; 53. pH monitor; 61. Sedimentation filter plate; 62. Multi-stage filtration unit; 7. Sludge pump; 81. Discharge pipe; 821. Electrodialysis device; 822. Reverse osmosis membrane module; 823. Evaporation and crystallization unit; 91. First connecting pipe; 92. Second connecting pipe; 93. Third connecting pipe; 100. Controller. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0035] like Figures 1 to 4As shown, the wastewater treatment device for lithium carbonate production includes a treatment tank 1, a sealing cover 2 hinged to the upper surface of the treatment tank 1, a partition 3 inside the treatment tank 1, the partition 3 dividing the treatment tank 1 into an equalization tank 31 and a sedimentation tank 32, a first feed pipe 21 penetrating through the sealing cover 2 and communicating with the equalization tank 31, a second feed pipe 22 penetrating through the sealing cover 2 and communicating with the sedimentation tank 32, a wastewater inlet pipe 10 located on one side of the equalization tank 31, a conveying pipe 4 located inside the equalization tank 31 and communicating with the sedimentation tank 32, a stirring component located inside the equalization tank 31, and a set of... In this invention, the filter assembly in the sedimentation tank 32, the sludge pump 7 at the lower part of the sedimentation tank 32, the residual material recovery unit connected to the sedimentation tank 32, and the controller 100 fixedly installed on the outside of the treatment tank 1 are all included. Untreated wastewater first enters the equalization tank 31, where the water quality is improved by adding chemicals, stirring, and adjusting the pH value. Then, it is transported to the sedimentation tank 32 through the conveying pipe 4. In the sedimentation tank 32, coagulants and coagulant aids are added to promote the sedimentation of suspended solids. Finally, the solids and liquids are separated by the filter assembly and the sludge pump 7, achieving efficient wastewater treatment and solid salt recovery.

[0036] Please refer to details. Figure 1 and Figure 2 One end of the conveying pipe 4 is in contact with the lower end face of the inner cavity of the equalization tank 31, and the other end of the conveying pipe 4 is connected to the upper end face of the inner cavity of the sedimentation tank 32. The equalization tank 31 is connected to one end of the conveying pipe 4 through its lower end face, while the other end of the conveying pipe 4 is connected to the upper end face of the inner cavity of the sedimentation tank 32. A booster pump is installed on the conveying pipe 4. The equalization tank 31 is used to receive untreated wastewater. The pH value of the wastewater is adjusted by adding chemicals and stirring to improve the water quality. The booster pump is responsible for pressurizing and conveying the wastewater in the equalization tank 31 to the sedimentation tank 32 to ensure efficient wastewater transfer. The sedimentation tank 32 provides space for wastewater sedimentation and removal of suspended solids. The working principle is as follows: Untreated wastewater first enters the equalization tank 31, where the water quality is improved by adding chemicals, stirring, and adjusting the pH value. Then, the wastewater is conveyed to the sedimentation tank 32 by the booster pump on the conveying pipe 4. In the sedimentation tank 32, the suspended solids in the wastewater are separated by sedimentation, thereby achieving a preliminary purification effect.

[0037] Please refer to details. Figure 1 and Figure 2The mixing components include a mixing shaft 51 disposed within the equalization tank 31, a mixing motor 511 connected to the mixing shaft 51, and an ultrasonic generator 52 disposed within the equalization tank 31. Sealed bearings are installed at both ends of the mixing shaft 51 where it connects to the equalization tank 31. The mixing motor 511 is fixedly disposed on the outside of the equalization tank 31, and its output shaft is connected to the mixing shaft 51. The mixing shaft 51 rotates within the equalization tank 31, driving the mixing of wastewater and the modified agent. The mixing motor 511 provides power, driving the mixing shaft 51 to rotate through its output shaft, ensuring thorough mixing of the wastewater and the agent. The ultrasonic generator 52 further enhances the mixing efficiency of the wastewater and the modified agent by generating ultrasonic waves. Sealed bearings are fixed at both ends of the mixing shaft 51, ensuring smooth rotation of the mixing shaft 51 within the equalization tank 31 while maintaining a tight seal. In terms of working principle, the stirring motor 511 drives the stirring shaft 51 to rotate, so that the wastewater and the modified agent are kept in a good stirring state, while the ultrasonic generator 52 enhances the stirring effect through the generated ultrasonic waves, thereby achieving efficient and uniform mixing.

[0038] Please refer to details. Figure 2 An ultrasonic generator 52 is fixedly installed inside the equalization tank 31, positioned relative to the stirring shaft 51. The ultrasonic generator 52 generates high-frequency sound waves within the equalization tank 31, enhancing the shear force between the stirring shaft 51 and the wastewater, effectively preventing impurity deposition. The stirring shaft 51 is responsible for stirring within the equalization tank 31, promoting full contact between the wastewater and the ultrasonic waves. The working principle is as follows: the ultrasonic generator 52, fixed inside the equalization tank 31 and positioned relative to the stirring shaft 51, generates high-frequency sound waves. These sound waves, combined with the stirring action of the stirring shaft 51, increase the molecular motion in the wastewater, forming a stronger shear force, thereby effectively preventing impurities from depositing at the bottom of the equalization tank 31 and improving the efficiency and effectiveness of wastewater treatment.

[0039] Please refer to details. Figure 2 and Figure 3 To facilitate pH value monitoring within the equalization tank 31, a pH monitor 53 is also included. The signal output of the pH monitor 53 is electrically connected to the signal input of the controller 100, monitoring the pH value within the equalization tank 31 in real time and transmitting the monitoring results to the controller 100 via a signal. Furthermore, the controller 100, as the core of information processing, receives the pH data transmitted by the pH monitor 53 and performs feedback control accordingly to maintain a stable pH value within the equalization tank 31. The working principle is as follows: the pH monitor 53 continuously monitors the pH value within the equalization tank 31 and transmits the data signal to the controller 100. After receiving the pH information, the controller 100 adjusts the feeding amount of the first feeding pipe 21 and the rotation speed of the stirring motor 511.

[0040] Please refer to details. Figure 2 , Figure 3 and Figure 4 The filter components are inclinedly arranged in the upper part of the sedimentation tank 32, including a sedimentation filter plate 61 and a multi-stage filtration unit 62 slidably arranged on the lower end face of the sedimentation filter plate 61. The sedimentation filter plate 61 is equipped with fiber packing. Wastewater is first poured onto the inclined sedimentation filter plate 61, and further settled and filtered by the fiber packing on the filter plate. Then it is filtered step by step by the sliding multi-stage filtration unit 62 to finally achieve the purpose of purification, thereby realizing the efficient purification of wastewater.

[0041] Please refer to details. Figure 3 and Figure 4 The multi-stage filtration unit 62 is slidably connected to the sedimentation tank 32. The multi-stage filtration unit 62 is configured in the sedimentation order as a quartz sand filter, an activated carbon filter, and a precision filter. The main function of the quartz sand filter is to remove suspended particulate matter from the water, intercepting larger particles and suspended solids through the quartz sand filter layer. The activated carbon filter is responsible for removing organic pollutants and some dissolved organic matter from the water, utilizing the porous structure and adsorption capacity of activated carbon to adsorb organic matter. The precision filter is mainly used to further remove fine impurities and particles from the water, ensuring the purity of the effluent. The overall working principle is as follows: water flows from the sedimentation tank 32 through the multi-stage filtration unit 62, first passing through the quartz sand filter to remove larger particles, then entering the activated carbon filter to adsorb organic pollutants, and finally passing through the precision filter for further filtration, progressively improving the water quality to ultimately obtain purified water.

[0042] The waste recovery unit includes a discharge pipe 81 connected to the lower end face of the sedimentation tank 32, an electrodialysis device 821 connected to the discharge pipe 81, a reverse osmosis membrane module 822 connected to the electrodialysis device 821, an evaporation crystallization unit 823 connected to the reverse osmosis membrane module 822, a first connecting pipe 91 between the electrodialysis device 821 and the reverse osmosis membrane module 822, a second connecting pipe 92 between the reverse osmosis membrane module 822 and the evaporation crystallization unit 823, and a third connecting pipe 93 between adjacent evaporation crystallization units 823. The electrodialysis device 821 includes a membrane stack composed of a monovalent selective cation exchange membrane and an antifouling anion exchange membrane, and a microfiltration pretreatment unit disposed on the membrane stack. The concentrate outlet of the electrodialysis device 821 is connected to the lithium extraction system through an external pipe, and the desalination outlet of the electrodialysis device 821 is connected to the reverse osmosis membrane module 822 through the first connecting pipe 91. The discharge pipe 81 is used to discharge the wastewater in the sedimentation tank 32 and transmit it to the electrodialysis device 821 for preliminary treatment. The electrodialysis unit 821 effectively separates lithium and sodium ions through a membrane stack consisting of a monovalent selective cation exchange membrane (CSO membrane) and an antifouling anion exchange membrane, as well as a microfiltration pretreatment unit, thereby improving lithium recovery efficiency. The electrodialysis concentrate is connected to the lithium extraction system via an external pipeline, while the desalination solution is transferred to the reverse osmosis membrane module 822 via the first connecting pipe 91. This reduces the salinity of the wastewater, alleviates the burden on the subsequent reverse osmosis membrane module 822, and extends the membrane's lifespan.

[0043] Please refer to details. Figure 4 The reverse osmosis membrane module 822 uses an anti-fouling RO membrane to further concentrate the salt in the wastewater. The concentrate is returned to the evaporation and crystallization system, while the product water can meet the reuse standards, and the salinity of the discharged water is greatly reduced.

[0044] Please refer to details. Figure 4 The evaporation and crystallization unit 823 includes an MVR evaporator and a centrifugal crystallizer for separating and recovering salts such as sodium sulfate and lithium carbonate, achieving efficient and energy-saving salt recovery. The entire system achieves effective utilization of wastewater through multi-stage treatment, reduces the separation cost of salts and lithium, improves recovery efficiency, and ultimately transports the high-lithium concentrate from the wastewater to the lithium extraction process, while the low-salt freshwater is reused or safely discharged.

[0045] In this embodiment, untreated wastewater first enters the equalization tank 31, where chemicals are added, agitated, and the pH value is adjusted to improve water quality. Then, it is transported to the sedimentation tank 32 via the conveying pipe 4. In the sedimentation tank 32, coagulants and flocculants are added to promote the sedimentation of suspended solids. The wastewater first pours onto the inclined sedimentation filter plate 61, where it undergoes further sedimentation and filtration through the fiber packing material. It then passes through a multi-stage filtration unit 62 with sliding arrangement, ultimately achieving purification and efficient wastewater purification. The sludge pump 7 pumps the settled sludge into a filter press for dewatering. The discharge pipe 81 discharges the wastewater from the sedimentation tank 32 and transmits it to the electrodialysis device 821 for preliminary treatment. The electrodialysis device 821 effectively separates lithium ions and sodium ions through a membrane stack composed of monovalent selective cation exchange membranes such as CSO membranes and antifouling anion exchange membranes, as well as a microfiltration pretreatment unit, thereby improving lithium recovery efficiency. The concentrate from electrodialysis is connected to the lithium extraction system via an external pipeline, while the desalinated solution is transferred to the reverse osmosis membrane module 822 via the first connecting pipeline 91 to further concentrate the salt in the wastewater. The concentrate is returned to the evaporation and crystallization system, and the produced water meets the reuse standards. The salinity of the discharged water is greatly reduced. The evaporation and crystallization unit 823 includes an MVR evaporator and a centrifugal crystallizer for separating and recovering salts such as sodium sulfate and lithium carbonate, achieving efficient and energy-saving salt recovery.

[0046] The above are preferred embodiments of this utility model. Those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above. Any obvious improvements, substitutions or modifications made by those skilled in the art based on this utility model shall fall within the protection scope of this utility model.

Claims

1. A wastewater treatment device for lithium carbonate production, characterized in that: The system includes a processing tank (1), a sealing cover plate (2) hinged to the upper surface of the processing tank (1), a partition plate (3) inside the processing tank (1), the partition plate (3) dividing the processing tank (1) into an equalization tank (31) and a sedimentation tank (32), a first feeding pipe (21) passing through the sealing cover plate (2) and communicating with the equalization tank (31), a second feeding pipe (22) passing through the sealing cover plate (2) and communicating with the sedimentation tank (32), a wastewater inlet pipe (10) on one side of the equalization tank (31), a conveying pipe (4) inside the equalization tank (31) and communicating with the sedimentation tank (32), a stirring component inside the equalization tank (31), a filter assembly inside the sedimentation tank (32), a sludge pump (7) in the lower part of the sedimentation tank (32), a residual material recovery unit communicating with the sedimentation tank (32), and a controller (100) fixedly installed outside the processing tank (1).

2. The wastewater treatment device for lithium carbonate production according to claim 1, characterized in that: One end of the conveying pipe (4) is in contact with the lower end face of the inner cavity of the regulating tank (31), and the other end of the conveying pipe (4) is connected to the upper end face of the inner cavity of the sedimentation tank (32).

3. The wastewater treatment device for lithium carbonate production according to claim 2, characterized in that: The stirring component includes a stirring shaft (51) disposed in the regulating tank (31), a stirring motor (511) connected to the stirring shaft (51), and an ultrasonic generator (52) disposed in the regulating tank (31). Sealed bearings are provided at the connection points between the two ends of the stirring shaft (51) and the regulating tank (31). The stirring motor (511) is fixedly disposed on the outside of the regulating tank (31), and the output shaft of the stirring motor (511) is connected to the stirring shaft (51).

4. The wastewater treatment device for lithium carbonate production according to claim 3, characterized in that: The ultrasonic generator (52) is fixedly installed in the inner cavity of the regulating tank (31), and the ultrasonic generator (52) is positioned relative to the stirring shaft (51).

5. The wastewater treatment device for lithium carbonate production according to claim 4, characterized in that: The filter assembly consists of a sedimentation filter plate (61) tilted in the upper part of the sedimentation tank (32) and a multi-stage filter unit (62) slidably disposed on the lower end face of the sedimentation filter plate (61). The sedimentation filter plate (61) is provided with fiber filler.

6. The wastewater treatment device for lithium carbonate production according to claim 5, characterized in that: The multi-stage filtration unit (62) is slidably connected to the sedimentation tank (32), and the multi-stage filtration unit (62) is configured in the sedimentation order as a quartz sand filter, an activated carbon filter and a precision filter.

7. The wastewater treatment device for lithium carbonate production according to claim 6, characterized in that: The residual material recovery unit includes a discharge pipe (81) connected to the lower end face of the sedimentation tank (32), an electrodialysis device (821) connected to the discharge pipe (81), a reverse osmosis membrane module (822) connected to the electrodialysis device (821), an evaporation crystallization unit (823) connected to the reverse osmosis membrane module (822), a first connecting pipe (91) disposed between the electrodialysis device (821) and the reverse osmosis membrane module (822), a second connecting pipe (92) disposed between the reverse osmosis membrane module (822) and the evaporation crystallization unit (823), and a third connecting pipe (93) disposed between adjacent evaporation crystallization units (823).

8. The wastewater treatment device for lithium carbonate production according to claim 7, characterized in that: It also includes a pH monitor (53) installed in the conditioning tank (31), the signal output terminal of the pH monitor (53) being electrically connected to the signal input terminal of the controller (100).

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