Lithium extraction device for FCDI

Abstract

The utility model relates to the field of salt lake electric de-intercalation lithium extraction equipment, and discloses a lithium extraction device for FCDI, which comprises pole plates, a pole frame, a liquid inlet assembly and a liquid outlet assembly, the front end face and the rear end face of the pole frame are provided with mounting grooves, the pole plates are embedded in the mounting grooves, the pole plates are provided with a plurality of S-shaped flow channels, and the S-shaped flow channels are communicated with the liquid inlet assembly and the liquid outlet assembly. A liquid outlet and a liquid inlet are formed in the upper side face and the lower side face of the electrode frame respectively, a top opening of the flow channel is communicated with the liquid outlet, a bottom opening of the flow channel is communicated with the liquid inlet, the liquid inlet assembly is connected with the liquid inlet, and the liquid outlet assembly is connected with the liquid outlet. Compared with the prior art, the lithium extraction device has the beneficial effects that the safety in the lithium extraction process is high, and the S-shaped runner arranged on the polar plate can fully utilize the area of the polar plate compared with a linear runner, so that slurry can stay for a longer time in the flowing process of the runner, the reaction is fully carried out, and the working efficiency of lithium extraction is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of salt lake electric deintercalation and lithium extraction equipment, in particular to a lithium extraction device for FCDI. Background Art

[0002] Salt lake electro-deionization lithium recovery technology usually has pole piece coating form and flow electrode form. The flow electrode form is also called FCDI lithium recovery process, and its full name is Flow-Cell Capacitive Deionization Lithium Recovery. The lithium recovery material is not coated on the pole piece, but dissolved in water in powder form to form a slurry, and the slurry flows through the flow channel set on the pole piece.

[0003] The current FCDI lithium extraction equipment usually uses a straight flow channel to transport the slurry, which cannot fully utilize the area of ​​the electrode plate, and the flow distance is short and the reaction time is short. Lithium cannot be extracted well within a flow interval from the inlet to the outlet. Therefore, it is necessary to provide a lithium extraction device for FCDI to solve the above problems. Utility Model Content

[0004] The purpose of the present application is to provide a lithium extraction device for FCDI so as to make the lithium extraction reaction proceed more fully.

[0005] The purpose of this application is achieved through the following technical solutions:

[0006] A lithium extraction device for FCDI comprises: a pole plate, a pole frame, a liquid inlet assembly and a liquid outlet assembly, wherein a mounting groove is provided on the front end surface of the pole frame, the pole plate is embedded in the mounting groove, a plurality of S-shaped flow channels are provided on the pole plate, a liquid outlet and a liquid inlet are provided on the upper side surface and the lower side surface of the pole frame respectively, the number of the liquid outlets and the number of the liquid inlets both correspond to the number of the flow channels one by one, the top opening of the flow channel is communicated with the liquid outlet, the bottom opening of the flow channel is communicated with the liquid inlet, the liquid inlet assembly is connected with the liquid inlet, and the liquid outlet assembly is connected with the liquid outlet.

[0007] In some embodiments of the present application, a mounting groove is also provided on the rear end surface of the pole frame.

[0008] In some embodiments of the present application, a caulking ring is further included, a caulking area is provided between the edge of the electrode plate and the mounting groove, the caulking ring is installed in the caulking area, and a liquid outlet connecting hole is provided at the top of the caulking ring, and a liquid inlet connecting hole is provided at the bottom of the caulking ring, the liquid outlet connecting hole connects the flow channel and the liquid outlet, and the liquid inlet connecting hole connects the flow channel and the liquid inlet.

[0009] In some embodiments of the present application, the width of the filling area is 5mm-10mm, the width of the filling ring is 0.5mm-1mm larger than the width of the filling area, and the filling ring is made of elastic material.

[0010] In some embodiments of the present application, a first bolt is further included. The pole frame is provided with a first screw hole, the first screw hole is located in the mounting groove, and the first bolt passes through the pole plate and is fixed in the first screw hole.

[0011] In some embodiments of the present application, a second bolt and a pole ear are further included, the pole frame is provided with a second screw hole, the second bolt is located in the mounting groove, the second bolt passes through the pole plate and is fixed in the second screw hole, and the second bolt is connected to the pole ear.

[0012] In some embodiments of the present application, graphite felt is provided between the end surface of the pole ear close to the pole plate and the pole plate.

[0013] In some embodiments of the present application, the corners of the flow channel are rounded structures.

[0014] In some embodiments of the present application, the ratio of the projected area of ​​the flow channel to the front end surface area of ​​the electrode plate is greater than 75%.

[0015] In some embodiments of the present application, the depth of the flow channel is 2mm-4mm, the width of the flow channel is 5mm-15mm, the distance between adjacent flow channels is 2mm-4mm, and the length of the flow channel is not less than 6m.

[0016] In the lithium extraction device for FCDI of the present application, the electrode plate with good conductivity is embedded in the electrode frame with poor conductivity, so as to improve the safety of the lithium extraction process and avoid direct contact between the charged electrode plate and the liquid inlet component or the liquid outlet component. In addition, the S-shaped flow channel arranged on the electrode plate can make better use of the electrode plate area compared with the straight flow channel, so that the slurry can stay for a longer time during the flow channel flow, thereby reacting more fully and improving the working efficiency of lithium extraction. The liquid outlet and liquid inlet on the electrode frame can cooperate with the liquid outlet component and the liquid inlet component to complete the transportation and recovery of the slurry, thereby completing the lithium extraction process of the lithium extraction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the lithium extraction device of the present application;

[0018] Figure 2 yes Figure 1 Enlarged view of part A in the middle;

[0019] Figure 3 It is a schematic diagram of the structure of the electrode plate of the present application;

[0020] Figure 4 It is a structural schematic diagram of the pole frame of the present application from a first perspective;

[0021] Figure 5 is a structural schematic diagram of the pole frame of the present application from a second viewing angle;

[0022] Figure 6 It is a structural schematic diagram of the caulking ring of the present application;

[0023] Figure 7 It is a schematic diagram of the composition structure of the caulking area of ​​the present application.

[0024] In the figure, 1, pole plate; 11, flow channel; 2, pole frame; 21, mounting groove; 22, liquid outlet; 23, liquid inlet; 24, first screw hole; 25, second screw hole; 3, liquid inlet assembly; 4, liquid outlet assembly; 5, caulking ring; 51, liquid outlet connecting hole; 52, liquid inlet connecting hole; 6, caulking area; 7, first bolt; 8, second bolt; 9, pole ear; 10, chamfered corner structure. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom" and the like used in the present application to indicate orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figure 1-7As shown, an embodiment of the present application proposes a lithium extraction device for FCDI, comprising: a pole plate 1, a pole frame 2, a liquid inlet component 3 and a liquid outlet component 4, the front end surface of the pole frame 2 is provided with a mounting groove 21, the pole plate 1 is embedded in the mounting groove 21, a plurality of S-shaped flow channels 11 are provided on the pole plate 1, and the upper side and lower side of the pole frame 2 are respectively provided with a liquid outlet 22 and a liquid inlet 23, the number of the liquid outlets 22 and the number of the liquid inlets 23 are both one-to-one corresponding to the number of the flow channels 11, the top opening of the flow channel 11 is communicated with the liquid outlet 22, the bottom opening of the flow channel 11 is communicated with the liquid inlet 23, the liquid inlet component 3 is connected to the liquid inlet 23, and the liquid outlet component 4 is connected to the liquid outlet 22.

[0029] Based on the above technical scheme, the lithium extraction device for FCDI of the present application, the pole plate 1 with good conductivity is embedded in the pole frame 2 with poor conductivity, so as to improve the safety of the lithium extraction process, avoid the charged pole plate 1 from directly contacting the liquid inlet assembly 3 or the liquid outlet assembly 4, and the S-shaped flow channel 11 provided on the pole plate 1 can make more full use of the area of ​​the pole plate 1 compared with the straight flow channel 11, so that the slurry can stay longer in the process of flowing in the flow channel 11, so as to react more fully and improve the working efficiency of lithium extraction, and the liquid outlet 22 and the liquid inlet 23 on the pole frame 2 can cooperate with the liquid outlet assembly 4 and the liquid inlet assembly 3 to complete the transportation and recovery of the slurry, thereby completing the lithium extraction process of the lithium extraction device. Preferably, the pole plate 1 adopts a graphite pole plate 1, which has the advantages of good conductivity and light weight, and the pole frame 2 adopts a PVC material with low price, small deformation and easy bonding as the pole frame 2 material, and can also have the effect of non-conductivity.

[0030] In some embodiments of the present application, Figure 5 As shown, the rear end face of the pole frame 2 is also provided with a mounting groove 21. When the pole frame 2 is located at the edge of the overall device, only one side needs to be provided with the pole plate 1. However, when the lithium extraction device is provided with multiple pole frames 2 to perform lithium extraction work at the same time, the structural form in which the mounting grooves 21 are provided on the front and rear sides of the pole frame 2 can ensure that the pole plates 1 are installed on both sides of the pole frame 2, so that the lithium extraction work can be performed together, saving space and improving the lithium extraction efficiency.

[0031] In some embodiments of the present application, Figure 1 , 6, 7, further comprising a caulking ring 5, a caulking area 6 is provided between the edge of the pole plate 1 and the mounting groove 21, the caulking ring 5 is installed in the caulking area 6, and a liquid outlet communication hole 51 is provided at the top of the caulking ring 5, and a liquid inlet communication hole 52 is provided at the bottom of the caulking ring 5, the liquid outlet communication hole 51 connects the flow channel 11 and the liquid outlet 22, and the liquid inlet communication hole 52 connects the flow channel 11 and the liquid inlet 23. In practical applications, due to the machining accuracy problem between the pole plate 1 and the mounting groove 21 of the pole frame 2, there will always be a size deviation between the outer peripheral size of the pole plate 1 and the inner frame size of the mounting groove 21 of the pole frame 2. When the deviation is positive, it will make the two difficult to install. When the deviation is negative, there will be problems of looseness and gaps after installation. Once there is a gap, the slurry will fill other channels along the gap, and each channel cannot be independently water-flowing, causing the problem of slurry running and short-circuiting. Therefore, the caulking ring 5 can be used in combination with the caulking area 6 to prevent slurry leakage through the caulking ring 5 or the caulking area 6, thereby achieving the effect of improving the stability and safety of the work. Preferably, the caulking ring 5 is an integrated structure, which is easy to install, easy to process, and has a better anti-leakage effect.

[0032] Specifically, Figure 1 , 6 As shown in Figure 7, the width of the caulking area 6 is 5mm-10mm, the width of the caulking ring 5 is 0.5mm-1mm larger than the width of the caulking area 6, and the caulking ring 5 is made of elastic material. The width of the caulking area 6 should not be too large or too small. If it is too large, the caulking ring 5 will consume a lot of materials and be costly; if it is too small, the caulking ring 5 will be difficult to smoothly insert into the caulking area 6, and the processing will also be more difficult. The elastic material of the caulking ring 5 is preferably rubber, which has good plasticity and low cost, can be deformed well, and because the width of the caulking ring 5 is larger than the width of the caulking area 6, the caulking ring 5 can fit tightly against the inner wall of the caulking area 6 after being installed in the caulking area 6, which is easy to install and has reliable sealing.

[0033] In some embodiments of the present application, Figure 1 , 4 As shown in , 5, it also includes a first bolt 7. The pole frame 2 is provided with a first screw hole 24. The first screw hole 24 is located in the mounting groove 21. The first bolt 7 passes through the pole plate 1 and is fixed in the first screw hole 24. The first bolt 7 is used to install the pole plate 1 in the pole frame 2. The first bolt 7 is fixed in cooperation with the first screw hole 24, which can prevent the pole plate 1 from shaking in the mounting groove 21, thereby avoiding accidents during operation. Preferably, the number of the first bolt 7 and the first screw hole 24 are both four, and the first screw hole 24 is a countersunk hole. The four bolts are distributed at the four corners of the pole plate 1, so that the pole plate 1 can be installed in the pole frame 2 more stably. More preferably, the first bolt 7 is a high-strength PEEK bolt, which is made of plastic, is non-conductive, has higher safety, and the strength can also meet the requirements.

[0034] In some embodiments of the present application, Figure 1 , 4 5, it also includes a second bolt 8 and a pole lug 9. The pole frame 2 is provided with a second screw hole 25. The second bolt 8 is located in the mounting groove 21. The second bolt 8 passes through the pole plate 1 and is fixed in the second screw hole 25. The second bolt 8 is connected to the pole lug 9. The pole lug 9 is used to energize the pole plate 1. The second bolt 8 is a connecting conductive member between the pole plate 1 and the pole lug 9. It is preferably a graphite bolt, which can effectively play a conductive role. Preferably, the second screw hole 25 is a through hole, and the second bolt 8 penetrates the second screw hole 25, so as to energize the two pole plates 1 at the front end and the rear end.

[0035] Specifically, graphite felt is provided between the end surface of the pole ear 9 close to the pole plate 1 and the pole plate 1. When in use, the pole ear 9 is screwed in from the edge of the pole frame 2, and the end of the pole ear 9 is a plane. When the pole ear 9 is screwed until the plane of the pole ear 9 is parallel to the pole plate 1, the graphite felt is padded to fill the gap formed by the processing error, so that the pole ear 9 and the pole plate 1 can form good electrical conduction.

[0036] In some embodiments of the present application, Figure 1 , 2 As shown, the corner of the flow channel 11 is a rounded structure 10. Although the flow channel 11 is set to be S-shaped compared to a straight line, it can improve the efficiency of lithium extraction, but the flow channel 11 in the prior art is usually a right-angle turn, which is easy to form a dead zone at the bend where materials accumulate, and the right angle has large resistance and pressure loss. Therefore, setting the corner of the flow channel 11 to a rounded structure can effectively avoid the dead zone formed by the right-angle bend, and the liquid can pass smoothly with low resistance and is not easy to accumulate materials.

[0037] In some embodiments of the present application, Figure 1 , 3 As shown in FIG. 7 , the ratio of the projected area of ​​the flow channel 11 to the front end surface area of ​​the electrode plate 1 is greater than 75%. A flow channel 11 ratio greater than 75% ensures full utilization of the area of ​​the electrode plate 1 and does not affect the installation of other components on the electrode plate 1.

[0038] In some embodiments of the present application, Figure 1 , 2 As shown in , 3, and 7, the depth of the flow channel 11 is 2mm-4mm, the width of the flow channel 11 is 5mm-15mm, and the distance between adjacent flow channels 11 is 2mm-4mm. The range of the depth and width of the flow channel 11 not only satisfies the smooth flow of the slurry, but also ensures the full utilization of the area of ​​the electrode plate 1. With the appropriate spacing of the flow channels 11, the structure of the lithium extraction device is more reasonable and the lithium extraction rate is higher.

[0039] In some embodiments of the present application, Figure 1 , 3 As shown in Figure 7, the length of the flow channel 11 is not less than 6 m. The length of the flow channel 11 is greater than 6 m, which can greatly improve the reaction time and lithium extraction efficiency compared with the straight flow channel 11.

[0040] The working process of the present application is as follows: the slurry is introduced into the electrode plate 1 through the liquid inlet assembly 3, and the slurry flows through the liquid inlet port 23 of the electrode frame 2 and the liquid inlet connecting hole 52 of the caulking ring 5 in turn to enter the flow channel 11 on the electrode plate 1, and the electrode plate 1 is energized through the electrode ear 9. The slurry releases lithium ions during the process of flowing through the current-carrying channel 11, and then flows through the liquid outlet connecting hole 51 of the caulking ring 5 and the liquid outlet port 22 of the electrode frame 2 in turn to enter the liquid outlet assembly 4, and is finally discharged from the lithium extraction device.

[0041] Here is a description of the preferred embodiment of the present application: iron phosphate particles + conductive carbon black particles + salt lake brine are configured as cathode slurry, and lithium iron phosphate particles + conductive carbon black particles + lithium-rich liquid are configured as anode slurry. The pole frame 2 is divided into a staggered arrangement of yin-yang-yin-anode from left to right, and the cathode frame and the anode frame are simultaneously fed with the cathode-anode slurry, and the pole ear 9 is fed with direct current. The current is transmitted to the pole plate 1 through the pole ear 9, and then transmitted to the slurry through the conductive carbon black particles. Iron phosphate obtains an electron, and at the same time absorbs lithium ions from the salt lake brine to become lithium iron phosphate, and lithium iron phosphate loses an electron, and at the same time releases lithium ions into the lithium-rich liquid. After most of the cathode side is converted into lithium iron phosphate and most of the anode side is converted into iron phosphate, the cathode and cathode slurries are extracted, and the mud cake is filtered out by pressure. After the mud cake is crushed and finely ground, the iron phosphate particles are added back to the cathode, and the lithium iron phosphate particles are added back to the anode. The polarity of the power supply does not need to be reversed, and the clear liquid obtained by filtering the cathode slurry is returned to the cathode, and the slurry obtained by filtering the anode is returned to the anode. Continue to power on. After several cycles, the lithium concentration in the lithium-rich solution becomes higher and higher. When it reaches a certain level (6 g / L), the lithium-rich solution is extracted and filtered to obtain a clear solution, that is, a clear solution with a high lithium content is obtained for subsequent further lithium extraction.

[0042] In summary, in the lithium extraction device for FCDI of the present application, the electrode plate 1 with good conductivity is embedded in the electrode frame 2 with poor conductivity, so as to improve the safety of the lithium extraction process and avoid direct contact between the charged electrode plate 1 and the liquid inlet component 3 or the liquid outlet component 4. In addition, the S-shaped flow channel 11 provided on the electrode plate 1 can make more full use of the area of ​​the electrode plate 1 compared with the straight flow channel 11, so that the slurry can stay longer in the process of flowing in the flow channel 11, so as to react more fully and improve the working efficiency of lithium extraction. The liquid outlet 22 and the liquid inlet 23 on the electrode frame 2 can cooperate with the liquid outlet component 4 and the liquid inlet component 3 to complete the transportation and recovery of the slurry, thereby completing the lithium extraction process of the lithium extraction device.

[0043] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims

1. A lithium extraction device for FCDI, characterized in that: include: A pole plate (1), a pole frame (2), a liquid inlet assembly (3) and a liquid outlet assembly (4); a mounting groove (21) is provided on the front end surface of the pole frame (2); the pole plate (1) is embedded in the mounting groove (21); a plurality of S-shaped flow channels (11) are provided on the pole plate (1); liquid outlets (22) and liquid inlets (23) are provided on the upper side and lower side of the pole frame (2); the number of the liquid outlets (22) and the number of the liquid inlets (23) are both in one-to-one correspondence with the number of the flow channels (11); the top opening of the flow channel (11) is in communication with the liquid outlet (22); the bottom opening of the flow channel (11) is in communication with the liquid inlet (23); the liquid inlet assembly (3) is connected to the liquid inlet (23); and the liquid outlet assembly (4) is connected to the liquid outlet (22).

2. The lithium extraction device for FCDI according to claim 1, characterized in that: The rear end surface of the pole frame (2) is also provided with a mounting groove (21).

3. The lithium extraction device for FCDI according to any one of claims 1 to 2, characterized in that: The invention also comprises a caulking ring (5), a caulking area (6) is provided between the edge of the electrode plate (1) and the mounting groove (21), the caulking ring (5) is installed in the caulking area (6), and a liquid outlet communication hole (51) is provided at the top of the caulking ring (5), and a liquid inlet communication hole (52) is provided at the bottom of the caulking ring (5), the liquid outlet communication hole (51) is connected to the flow channel (11) and the liquid outlet (22), and the liquid inlet communication hole (52) is connected to the flow channel (11) and the liquid inlet (23).

4. The lithium extraction device for FCDI according to claim 3, characterized in that: The width of the caulking area (6) is 5 mm to 10 mm, the width of the caulking ring (5) is 0.5 mm to 1 mm greater than the width of the caulking area (6), and the caulking ring (5) is made of elastic material.

5. The lithium extraction device for FCDI according to any one of claims 1 to 2, characterized in that: It also includes a first bolt (7), the pole frame (2) is provided with a first screw hole (24), the first screw hole (24) is located in the mounting groove (21), and the first bolt (7) passes through the pole plate (1) and is fixed in the first screw hole (24).

6. The lithium extraction device for FCDI according to any one of claims 1-2, characterized in that: It also includes a second bolt (8) and a pole lug (9), the pole frame (2) is provided with a second screw hole (25), the second bolt (8) is located in the mounting groove (21), the second bolt (8) passes through the pole plate (1) and is fixed in the second screw hole (25), and the second bolt (8) is connected to the pole lug (9).

7. The lithium extraction device for FCDI according to claim 6, characterized in that: A graphite felt is provided between the end surface of the pole ear (9) close to the pole plate (1) and the pole plate (1).

8. The lithium extraction device for FCDI according to any one of claims 1 to 2, characterized in that: The corners of the flow channel (11) are rounded structures (10).

9. The lithium extraction device for FCDI according to any one of claims 1-2, characterized in that: The ratio of the projected area of ​​the flow channel (11) to the front end surface area of ​​the electrode plate (1) is greater than 75%.

10. The lithium extraction device for FCDI according to any one of claims 1 to 2, characterized in that: The depth of the flow channel (11) is 2 mm-4 mm, the width of the flow channel (11) is 5 mm-15 mm, and the distance between adjacent flow channels (11) is 2 mm-4 mm; the length of the flow channel (11) is not less than 6 m.

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