A wastewater treatment process for preparing lithium sulfate solution

Abstract

The present invention discloses a wastewater treatment process for preparing lithium sulfate solution, and relates to the technical field of wastewater treatment. The wastewater treatment process for preparing lithium sulfate solution, through the cooperation of positioning fins installed inside the machine body and multiple filter screens, can drive the multiple filter screens to operate during the mixing of liquids, thereby ensuring the filtering effect of production wastewater. The elastic cleaning scraper cooperates with the arc-shaped loading rack to scrape impurities adhered to the surface of the filter screens, and then the operation of multiple feed rollers automatically pushes the impurities out, ensuring the subsequent mixing effect of production wastewater and dilute sulfuric acid, while also improving the operational convenience of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment process for preparing a lithium sulfate solution. Background Art

[0002] During the manufacturing process of lithium battery positive electrode materials, a large amount of lithium-containing wastewater with a high concentration is generated. By mixing the wastewater with an appropriate amount of dilute sulfuric acid, a lithium sulfate solution can be obtained. Referring to the Chinese patent with publication number "CN116282649A" entitled "A method for recovering wastewater from the production of lithium-ion positive electrode materials", the patent points out that existing lithium battery positive electrode material manufacturers will discharge the wastewater after treating it to meet national emission standards, so that the lithium ions in the wastewater are not collected; however, this method lacks pretreatment of the wastewater when mixing the production wastewater, resulting in a poor mixing effect of the production wastewater and dilute sulfuric acid, and the transportation and introduction of the production wastewater affect the operating efficiency of the equipment. In response to this, we propose a wastewater treatment process for the preparation of lithium sulfate solution to solve the above problems. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention provides a wastewater treatment process for preparing lithium sulfate solution, which solves the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A wastewater treatment process for preparing lithium sulfate solution, specifically comprising the following steps:

[0005] S1, connects to the wastewater discharge port through a pipeline, transports the production wastewater to the pretreatment equipment, and collects and stores the production wastewater;

[0006] S2. Add an appropriate amount of dilute sulfuric acid to the pretreatment equipment and stir and mix thoroughly to react the lithium solution and sulfuric acid in the production wastewater to form a lithium sulfate solution in the wastewater;

[0007] The pretreatment equipment includes a body, a mixing rod is rotatably connected to the inside of the body, an assembly ring is fixedly sleeved on the end of the mixing rod, and a plurality of mixing blades are fixed on the outside of the assembly ring for stirring the solution;

[0008] The body is provided with a mixing rod with a positioning ring fixedly sleeved on the outside, and a plurality of positioning fins fixedly sleeved on the outside of the positioning ring, and a filter is fixedly installed between two adjacent positioning fins for filtering the wastewater introduced into the body;

[0009] An arc-shaped feeding rack is fixedly installed inside the machine body, and an elastic cleaning scraper is fixed to the bottom of the arc-shaped feeding rack. The arc-shaped feeding rack is installed at an angle, and the elastic cleaning scraper fits the filter screen and is used to clean the filter screen. A plurality of feeding rollers are rotatably installed inside the arc-shaped feeding rack, and a chain for transmission is connected between the plurality of feeding rollers, and elastic feeding sheets are fixedly installed on the outside of the plurality of feeding rollers. A motor is installed inside the machine body to drive the feeding rollers to operate.

[0010] Preferably, a discharge rack is fixedly installed inside the machine body, and the installation position of the discharge rack is located at the end of the arc-shaped loading rack.

[0011] Preferably, support frames are fixed around the bottom of the body, a discharge pipe is installed at the bottom of the body, and a liquid inlet pipe and a delivery pipe are fixedly installed on both sides of the top surface of the body.

[0012] Preferably, a servo motor is fixedly mounted on the top surface of the machine body, and an output end of the servo motor is connected to an end of the mixing rod via a coupling.

[0013] Preferably, a conical base is installed inside the body for sliding up and down, and the installation position of the conical base is located below the multiple filter screens and positioning fins, and a distance is left between the conical base and the multiple filter screens. Multiple drop pipes are fixedly installed inside the conical base, and solenoid valves are provided inside the multiple drop pipes.

[0014] Preferably, a slide groove is provided on the top surface of the conical base, and the ends of the plurality of positioning fins are fixedly mounted with slide rods, and the plurality of slide rods are slidably mounted inside the slide groove.

[0015] Preferably, a cleaning blade is fixedly mounted on the outer side of the conical base, and the cleaning blade is in contact with the inner wall of the machine body.

[0016] Preferably, a driving assembly is provided on the top surface of the machine body for driving the conical base to operate inside the machine body.

[0017] Preferably, the driving assembly includes a driving winding roller, a protective frame is fixedly installed on the top surface of the machine body, the driving winding roller is rotatably installed inside the protective frame, both ends of the driving winding roller are fixedly sleeved with winding end heads, and steel wire ropes are wound around the outside of the winding end heads, and concave lifting frames are fixedly installed on both sides of the top surface of the conical base frame, and the ends of the two sections of the steel wire ropes pass through the machine body and are respectively fixedly connected to the corresponding concave lifting frames.

[0018] Preferably, a driving motor is fixedly installed inside the protective frame, and a driving gear is fixedly sleeved on the outer side of the driving motor, and the two driving gears are meshed with each other.

[0019] The present invention provides a wastewater treatment process for preparing lithium sulfate solution. Compared with the prior art, it has the following advantages:

[0020] (1) The wastewater treatment process for the preparation of lithium sulfate solution can drive the operation of multiple filter screens during the mixing of liquids through the cooperation of the positioning fins installed inside the machine body and multiple filter screens, thereby ensuring the filtering effect of production wastewater. The elastic cleaning scraper and the arc-shaped loading rack are used to scrape off impurities attached to the surface of the filter screen, and then the impurities are automatically pushed out through the operation of multiple feeding rollers, thereby ensuring the mixing effect of subsequent production wastewater and dilute sulfuric acid and improving the operation convenience of the equipment.

[0021] (2) The wastewater treatment process for the preparation of lithium sulfate solution, through the setting of the conical base frame, can achieve the simultaneous introduction of production wastewater and dilute sulfuric acid while discharging the mixed solution after the equipment completes mixing. The conical base frame can separate the mixed solution from the unmixed solution, reducing the time required for the introduction of production wastewater and dilute sulfuric acid into the body, and effectively improving the operating efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 Schematic diagram of cross-section structure;

[0024] Figure 3 For the present invention Figure 2 A in the middle is an enlarged structural diagram;

[0025] Figure 4 For the present invention Figure 2 side view schematic diagram;

[0026] Figure 5 This is a schematic diagram of the cross-sectional structure of the positioning fin plate of the present invention;

[0027] Figure 6 For the present invention Figure 5 The enlarged structural diagram at B in the middle;

[0028] Figure 7 This is a schematic diagram of the front view of the conical base frame of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the arc-shaped loading rack of the present invention.

[0030] In the figure: 1. Machine body; 101. Support frame; 2. Discharge pipe; 3. Liquid inlet pipe; 4. Delivery pipe; 5. Discharge rack; 6. Protective rack; 7. Servo motor; 8. Mixing rod; 801. Assembly ring; 802. Mixing blade; 9. Positioning ring; 901. Positioning fin; 902. Filter; 10. Slide rod; 11. Conical base; 1101. Chute; 1102. Cleaning scraper; 12. Wire rope; 13. Drive winding roller; 1301. Winding end; 14. Drive motor; 15. Drive gear; 16. Concave lifting frame; 17. Dropping pipe; 18. Arc-shaped loading rack; 1801. Elastic cleaning scraper; 19. Feeding roller; 1901. Elastic feeding sheet. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figures 1-8 The present invention provides two technical solutions, specifically including the following embodiments: Example

[0033] A process for treating wastewater for preparing lithium sulfate solution, comprising the following steps:

[0034] S1, connects to the wastewater discharge port through a pipeline, transports the production wastewater to the pretreatment equipment, and collects and stores the production wastewater;

[0035] S2. Add an appropriate amount of dilute sulfuric acid to the pretreatment equipment and stir and mix thoroughly to react the lithium solution and sulfuric acid in the production wastewater to form a lithium sulfate solution in the wastewater;

[0036] refer to Figures 1-8 The pretreatment equipment includes a body 1, a mixing rod 8 is rotatably connected to the inside of the body 1, an assembly ring 801 is fixedly sleeved on the end of the mixing rod 8, and a plurality of mixing blades 802 are fixed on the outside of the assembly ring 801 for stirring the solution. After the production wastewater to be treated is introduced into the body 1, an appropriate amount of dilute sulfuric acid is added to the body 1, and then the operation of the mixing rod 8 can drive the assembly ring 801 and the plurality of mixing blades 802 to operate, thereby stirring the solution inside the body 1;

[0037] Furthermore, a mixing rod 8 is provided inside the machine body 1, and a positioning ring 9 is fixedly sleeved on the outside of the mixing rod 8. A plurality of positioning fins 901 are fixedly sleeved on the outside of the positioning ring 9. A filter screen 902 is fixedly installed between two adjacent positioning fins 901 for filtering the wastewater introduced into the machine body 1. When the production wastewater is introduced into the machine body 1, it can first pass through the plurality of filter screens 902. At this time, the plurality of filter screens 902 can rotate along the mixing rod 8 through the cooperation of the positioning fins 901 and the positioning ring 9, which ensures the uniformity of filtration and reduces the clogging phenomenon during the filtration process. By preliminarily filtering the transported production wastewater, the mixing effect of the subsequent solution is guaranteed.

[0038] Furthermore, an arc-shaped loading rack 18 is fixedly installed inside the machine body 1, and an elastic cleaning scraper 1801 is fixed to the bottom of the arc-shaped loading rack 18. The arc-shaped loading rack 18 is installed at an angle, and the elastic cleaning scraper 1801 fits together with the filter screen 902 for cleaning the filter screen 902. A plurality of feeding rollers 19 are rotatably installed inside the arc-shaped loading rack 18, and a chain for transmission is connected between the plurality of feeding rollers 19, and elastic feeding pieces 1901 are fixedly installed on the outside of the plurality of feeding rollers 19. A motor is installed inside the machine body 1 for driving the feeding rollers 19 to operate, and a discharge rack 5 is fixedly installed inside the machine body 1, and the installation position of the discharge rack 5 is located at the end of the arc-shaped loading rack 18; the motor is an existing device, and its output The ends are connected to the corresponding ends of the feeding rollers 19, and the chain is an existing transmission chain, which realizes the transmission operation by cooperating with the sprocket. The sprocket is sleeved on the ends of the multiple feeding rollers 19 to realize the operation of the multiple feeding rollers 19. The arc-shaped feeding rack 18 is installed obliquely. When the multiple filter screens 902 rotate, the impurities attached to the surface of the filter screen 902 can be scraped off by the cooperation of the elastic cleaning scraper 1801, and pushed upward with the arc surface of the arc-shaped feeding rack 18. Through the operation of the multiple feeding rollers 19, the cleaning of the filter screen 902 and the pushing of impurities can be further realized by the elastic feeding piece 1901 until the impurities are automatically discharged through the discharge rack 5, which effectively improves the operation convenience of the equipment.

[0039] Furthermore, support frames 101 are fixed around the bottom of the body 1, a discharge pipe 2 is installed at the bottom of the body 1, and a liquid inlet pipe 3 and a delivery pipe 4 are fixedly installed on both sides of the top surface of the body 1. The discharge pipe 2 is used to discharge the mixed solution, the liquid inlet pipe 3 is used to transport production wastewater, and the delivery pipe 4 is used to transport dilute sulfuric acid;

[0040] Specifically, a servo motor 7 is fixedly mounted on the top surface of the machine body 1 , and an output end of the servo motor 7 is connected to an end of a mixing rod 8 via a coupling. The servo motor 7 is an existing device for realizing driving operation.

[0041] Example 2: Based on Example 1, a wastewater treatment process for preparing lithium sulfate solution specifically comprises the following steps:

[0042] S1, connects to the wastewater discharge port through a pipeline, transports the production wastewater to the pretreatment equipment, and collects and stores the production wastewater;

[0043] S2. Add an appropriate amount of dilute sulfuric acid to the pretreatment equipment and stir and mix thoroughly to react the lithium solution and sulfuric acid in the production wastewater to form a lithium sulfate solution in the wastewater;

[0044] refer to Figures 1-8 The pretreatment equipment includes a body 1, a mixing rod 8 is rotatably connected to the inside of the body 1, an assembly ring 801 is fixedly sleeved on the end of the mixing rod 8, and a plurality of mixing blades 802 are fixed on the outside of the assembly ring 801 for stirring the solution. After the production wastewater to be treated is introduced into the body 1, an appropriate amount of dilute sulfuric acid is added to the body 1, and then the operation of the mixing rod 8 can drive the assembly ring 801 and the plurality of mixing blades 802 to operate, thereby stirring the solution inside the body 1;

[0045] Furthermore, a mixing rod 8 is provided inside the machine body 1, and a positioning ring 9 is fixedly sleeved on the outside of the mixing rod 8. A plurality of positioning fins 901 are fixedly sleeved on the outside of the positioning ring 9. A filter screen 902 is fixedly installed between two adjacent positioning fins 901 for filtering the wastewater introduced into the machine body 1. When the production wastewater is introduced into the machine body 1, it can first pass through the plurality of filter screens 902. At this time, the plurality of filter screens 902 can rotate along the mixing rod 8 through the cooperation of the positioning fins 901 and the positioning ring 9, which ensures the uniformity of filtration and reduces the clogging phenomenon during the filtration process. By preliminarily filtering the transported production wastewater, the mixing effect of the subsequent solution is guaranteed.

[0046] Furthermore, an arc-shaped loading rack 18 is fixedly installed inside the machine body 1, and an elastic cleaning scraper 1801 is fixed to the bottom of the arc-shaped loading rack 18. The arc-shaped loading rack 18 is installed at an angle, and the elastic cleaning scraper 1801 fits together with the filter screen 902 for cleaning the filter screen 902. A plurality of feeding rollers 19 are rotatably installed inside the arc-shaped loading rack 18, and a chain for transmission is connected between the plurality of feeding rollers 19, and elastic feeding pieces 1901 are fixedly installed on the outside of the plurality of feeding rollers 19. A motor is installed inside the machine body 1 for driving the feeding rollers 19 to operate, and a discharge rack 5 is fixedly installed inside the machine body 1, and the installation position of the discharge rack 5 is located at the end of the arc-shaped loading rack 18; the motor is an existing device, and its output The ends are connected to the corresponding ends of the feeding rollers 19, and the chain is an existing transmission chain, which realizes the transmission operation by cooperating with the sprocket. The sprocket is sleeved on the ends of the multiple feeding rollers 19 to realize the operation of the multiple feeding rollers 19. The arc-shaped feeding rack 18 is installed obliquely. When the multiple filter screens 902 rotate, the impurities attached to the surface of the filter screen 902 can be scraped off by the cooperation of the elastic cleaning scraper 1801, and pushed upward with the arc surface of the arc-shaped feeding rack 18. Through the operation of the multiple feeding rollers 19, the cleaning of the filter screen 902 and the pushing of impurities can be further realized by the elastic feeding piece 1901 until the impurities are automatically discharged through the discharge rack 5, which effectively improves the operation convenience of the equipment.

[0047] Furthermore, support frames 101 are fixed around the bottom of the body 1, a discharge pipe 2 is installed at the bottom of the body 1, and a liquid inlet pipe 3 and a delivery pipe 4 are fixedly installed on both sides of the top surface of the body 1. The discharge pipe 2 is used to discharge the mixed solution, the liquid inlet pipe 3 is used to transport production wastewater, and the delivery pipe 4 is used to transport dilute sulfuric acid;

[0048] Specifically, a servo motor 7 is fixedly mounted on the top surface of the machine body 1. The output end of the servo motor 7 is connected to the end of the mixing rod 8 via a coupling. The servo motor 7 is an existing device for achieving driving operation.

[0049] Furthermore, a conical base frame 11 is installed in the body 1 so as to slide up and down. The installation position of the conical base frame 11 is located below the multiple filter screens 902 and the positioning fin plate 901, and a distance is left between the conical base frame 11 and the multiple filter screens 902. A plurality of drop pipes 17 are fixedly installed in the conical base frame 11. The multiple drop pipes 17 are internally provided with electromagnetic valves. The electromagnetic valves are existing devices for controlling the opening and closing of the drop pipes 17. When the equipment is in the process of introducing production wastewater and dilute sulfuric acid, the electromagnetic valves are opened to allow the production wastewater and dilute sulfuric acid to pass through. Multiple drop pipes 17 enter the interior of the body 1. When the mixing is completed and the mixed solution is discharged through the discharge pipe 2, the solenoid valve is closed. At this time, production wastewater and dilute sulfuric acid can be simultaneously introduced into the interior of the body 1 through the liquid inlet pipe 3 and the delivery pipe 4. At this time, as the solenoid valve is closed, the solution can flow into the interior of the conical base 11 after passing through the filter 902. As the conical base 11 is forced to slide downward until it moves to the bottom of the body 1, the cooperation of the conical base 11 can separate the mixed solution and the synchronously introduced solution, further improving the operating efficiency of the equipment;

[0050] Furthermore, a slide groove 1101 is provided on the top surface of the conical base 11, and a slide rod 10 is fixedly installed at the end of each of the plurality of positioning fins 901. The plurality of slide rods 10 are slidably installed inside the slide groove 1101. Through the cooperation between the slide rod 10 and the slide groove 1101, the operating stability of the plurality of filter screens 902 can be further improved.

[0051] Specifically, a cleaning blade 1102 is fixedly installed on the outer side of the conical base 11. The cleaning blade 1102 is in contact with the inner wall of the body 1. When the conical base 11 slides up and down inside the body 1, the cleaning blade 1102 can cooperate with the cleaning blade 1102 to clean the inner wall of the body 1, thereby improving the maintenance convenience of the equipment.

[0052] Specifically, a driving assembly is provided on the top surface of the body 1 for driving the conical base frame 11 to operate inside the body 1; the driving assembly includes a driving winding roller 13, a protective frame 6 is fixedly installed on the top surface of the body 1, and the driving winding roller 13 is rotatably installed inside the protective frame 6, and both ends of the driving winding roller 13 are fixedly sleeved with winding end heads 1301, and the outside of the winding end heads 1301 are wound with steel wire ropes 12, and concave lifting frames 16 are fixedly installed on both sides of the top surface of the conical base frame 11, and the ends of the two sections of steel wire ropes 12 pass through the body 1 and are fixedly connected to the corresponding concave lifting frames 16 respectively; a driving motor 14 is fixedly installed inside the protective frame 6, and the output end of the driving motor 14 and the driving winding roller are fixedly installed inside the protective frame 6. The outer side of the winding roller 13 is fixedly sleeved with a driving gear 15, and the two driving gears 15 are meshed with each other. The driving motor 14 can drive the driving winding roller 13 to operate through the cooperation of the driving gear 15 to realize the winding operation of the wire rope 12. The driving motor 14 is a forward and reverse motor. When the conical base 11 is pressed and slides downward, the driving motor 14 reverses to unwind the wire rope 12. When the conical base 11 moves to the bottom of the body 1, the mixed solution has been discharged. By opening multiple solenoid valves and then rotating the driving motor 14 forward, the wire rope 12 can be wound, so that the conical base 11 is forced to slide upward until it is separated from the liquid surface and the mixing operation can be carried out.

[0053] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0054] The above is a detailed description of an embodiment of the present invention. However, the content is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A wastewater treatment process for preparing lithium sulfate solution, characterized in that: The specific steps include: S1, connects to the wastewater discharge port through a pipeline, transports the production wastewater to the pretreatment equipment, and collects and stores the production wastewater; S2. Add an appropriate amount of dilute sulfuric acid to the pretreatment equipment and stir and mix thoroughly to react the lithium solution and sulfuric acid in the production wastewater to form a lithium sulfate solution in the wastewater; The pretreatment equipment comprises a body (1), a mixing rod (8) is rotatably connected to the inside of the body (1), an assembly ring (801) is fixedly sleeved on the end of the mixing rod (8), and a plurality of mixing blades (802) are fixed on the outside of the assembly ring (801) for stirring the solution; The body (1) is provided with a mixing rod (8) having a positioning ring (9) fixedly sleeved on its outer side, and a plurality of positioning fins (901) fixedly sleeved on the outer side of the positioning ring (9), and a filter screen (902) fixedly installed between two adjacent positioning fins (901) for filtering wastewater introduced into the body (1); An arc-shaped loading rack (18) is fixedly installed inside the machine body (1), and an elastic cleaning scraper (1801) is fixed at the bottom of the arc-shaped loading rack (18). The arc-shaped loading rack (18) is installed in an inclined manner, and the elastic cleaning scraper (1801) and the filter screen (902) are in contact with each other and are used to clean the filter screen (902). A plurality of feeding rollers (19) are rotatably installed inside the arc-shaped loading rack (18), and a chain for transmission is connected between the plurality of feeding rollers (19), and elastic feeding sheets (1901) are fixedly installed on the outside of the plurality of feeding rollers (19). A motor is installed inside the machine body (1) to drive the feeding rollers (19) to operate; A conical base frame (11) is installed in the body (1) so as to slide up and down. The installation position of the conical base frame (11) is located below the multiple filter screens (902) and the positioning fin plate (901), and a distance is left between the conical base frame (11) and the multiple filter screens (902). A plurality of drop tubes (17) are fixedly installed in the conical base frame (11), and a solenoid valve is provided in the multiple drop tubes (17). The top surface of the machine body (1) is provided with a driving assembly for driving the conical base frame (11) to operate inside the machine body (1).

2. A wastewater treatment process for preparing a lithium sulfate solution according to claim 1, characterized in that: A discharge rack (5) is fixedly installed inside the machine body (1), and the installation position of the discharge rack (5) is located at the end of the arc-shaped loading rack (18).

3. A wastewater treatment process for preparing a lithium sulfate solution according to claim 1, characterized in that: Support frames (101) are fixed around the bottom of the machine body (1), a discharge pipe (2) is installed at the bottom of the machine body (1), and a liquid inlet pipe (3) and a delivery pipe (4) are fixedly installed on both sides of the top surface of the machine body (1).

4. A wastewater treatment process for preparing a lithium sulfate solution according to claim 1, characterized in that: A servo motor (7) is fixedly mounted on the top surface of the machine body (1), and an output end of the servo motor (7) is connected to an end of a mixing rod (8) via a coupling.

5. A wastewater treatment process for preparing a lithium sulfate solution according to claim 1, characterized in that: A cleaning scraper (1102) is fixedly mounted on the outer side of the conical base frame (11), and the cleaning scraper (1102) is in contact with the inner wall of the machine body (1).

6. A wastewater treatment process for preparing a lithium sulfate solution according to claim 1, characterized in that: The driving assembly includes a driving winding roller (13), a protective frame (6) is fixedly installed on the top surface of the machine body (1), and the driving winding roller (13) is rotatably installed inside the protective frame (6). Winding ends (1301) are fixedly sleeved at both ends of the driving winding roller (13), and steel wire ropes (12) are wound around the outside of the winding ends (1301). Concave lifting frames (16) are fixedly installed on both sides of the top surface of the conical base frame (11), and the ends of the two sections of the steel wire ropes (12) pass through the machine body (1) and are fixedly connected to the corresponding concave lifting frames (16).

7. A wastewater treatment process for preparing a lithium sulfate solution according to claim 6, characterized in that: A driving motor (14) is fixedly installed inside the protective frame (6), and a driving gear (15) is fixedly sleeved on the output end of the driving motor (14) and the outer side of the driving winding roller (13), and the two driving gears (15) are meshed with each other.

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