A back-extraction tower for lithium recovery using extraction method

Abstract

A reverse extraction tower for recovering lithium by extraction method relates to a reaction tower. A partition is provided at the lower part of the cavity (4) to divide the cavity below the partition into a gas storage chamber (14). A waterproof and breathable membrane is covered on the partition. A gas connecting pipe (19) is provided on the outer wall of the tower body (3) to connect the cavity above the liquid level line (6) and the gas storage chamber. A liquid circulation pipe (10) is also provided on the outer wall of the tower body (3) to connect the part below the liquid level line near the partition and the upper part of the cavity below the liquid level line. This utility model provides a partition in the tower body to block liquid reactants and allow gas reactants to pass through smoothly. A liquid circulation pipe is provided between the upper and lower ends of the liquid reactants, and a gas connecting pipe is provided between the top of the cavity and the gas storage chamber to regulate the gas pressure. By using gas pressure and liquid circulation, the gas reactants and liquid reactants can react fully.

Description

Technical Field

[0001] This utility model relates to a reaction tower, and more particularly to a back-extraction tower for recovering lithium using an extraction method. Background Technology

[0002] In the lithium carbonate production industry, the most popular method for extracting lithium from low-content lithium-containing brines (including lithium precipitation mother liquor, process wastewater, etc.) is extraction. In this method, after the lithium in the lithium-containing brine is extracted by an organic solvent, a lithium-loaded organic solvent is obtained. The lithium-loaded organic solvent needs to react with water and carbon dioxide to obtain a blank organic solvent and a lithium bicarbonate solution. Currently used three-media back-extraction devices mainly include back-extraction towers, back-extraction kettles, and multiphase flow reactors.

[0003] Traditional back-extraction methods typically involve stirring the loaded organic matter, water, and carbon dioxide in a reaction vessel using a stirrer. While this facilitates the full mixing of water and the loaded organic solution, this structure is not conducive to the full reaction of gaseous carbon dioxide and liquid reactants. Furthermore, using a stirrer increases power consumption, resulting in low economic efficiency. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model discloses a back-extraction tower for recovering lithium using an extraction method. By setting a baffle in the tower body to block liquid reactants and allow gaseous reactants to pass through smoothly, and setting a liquid circulation pipe between the upper and lower ends of the liquid reactants, and setting a gas connecting pipe between the top of the chamber and the gas storage chamber to regulate gas pressure, the purpose of achieving full reaction of gaseous and liquid reactants without stirring is achieved by using gas pressure and liquid circulation.

[0005] To achieve the aforementioned objective, this utility model adopts the following technical solution:

[0006] A lithium recovery tower using an extraction method includes a tower body with a cavity inside. A baffle plate at the bottom of the cavity divides the cavity below the baffle plate into a gas storage chamber. The baffle plate is covered with a waterproof and breathable membrane. A liquid level line is provided at the top of the cavity above the baffle plate. A gas connecting pipe is provided on the outer wall of the tower body, connecting the cavity above the liquid level line and the gas storage chamber. A one-way valve is provided on the gas connecting pipe. A liquid circulation pipe is also provided on the outer wall of the tower body, connecting the portion below the liquid level line near the baffle plate and the upper part of the cavity below the liquid level line. A liquid circulation pump is provided on the liquid circulation pipe.

[0007] The counter-extraction tower for recovering lithium by extraction method described above, the partition plate includes a circular plate body and an annular bracket. There are perforations densely distributed on the circular plate body. The outer edge of the circular plate body is in close contact with the side wall of the cavity. Waterproof and breathable membranes are covered on both the upper and lower bottom surfaces of the circular plate body. There are two annular brackets which are arranged at the top and bottom of the circular plate body to clamp the circular plate body. The outer edge of the annular bracket is fixedly connected to the side wall of the cavity. Multiple grid bars are arranged at intervals inside the annular bracket.

[0008] For the counter-extraction tower for recovering lithium by extraction method described above, a feed pipe penetrating the cavity is provided outside the tower body above the liquid level line.

[0009] For the counter-extraction tower for recovering lithium by extraction method described above, an air inlet pipe penetrating the gas storage bin is provided at the bottom of the tower body.

[0010] For the counter-extraction tower for recovering lithium by extraction method described above, a "J-shaped" overflow pipe penetrating the upper part of the side wall of the cavity below the liquid level line is provided outside the tower body. The highest part of the pipe cavity of the "J-shaped" overflow pipe is flush with the liquid level line. A valve is provided at the highest part of the pipe cavity of the "J-shaped" overflow pipe.

[0011] For the counter-extraction tower for recovering lithium by extraction method described above, a pressure gauge is provided at the top of the tower body.

[0012] For the counter-extraction tower for recovering lithium by extraction method described above, a maintenance opening is provided at the top of the tower body, and a cover plate is covered on the maintenance opening.

[0013] For the counter-extraction tower for recovering lithium by extraction method described above, a plurality of observation ports are provided at intervals along the longitudinal direction on the side wall of the tower body, and a glass observation window is provided on each observation port.

[0014] For the counter-extraction tower for recovering lithium by extraction method described above, legs are provided at the bottom of the tower body.

[0015] Due to the adoption of the above technical solutions, the utility model has the following beneficial effects:

[0016] For the counter-extraction tower for recovering lithium by extraction method of the utility model, by arranging a partition plate in the tower body for blocking liquid reactants and enabling gas reactants to pass through smoothly, and arranging a liquid circulation pipe between the upper end and the lower end of the liquid reactants, and arranging a gas communication pipe for adjusting gas pressure between the top of the cavity and the gas storage bin, the purpose of enabling the gas reactants and the liquid reactants to fully react without stirring, using gas pressure and liquid circulation is achieved; the structure of the utility model is simple, easy to operate, simplifies the reaction process of the gas reactants and the liquid reactants, improves the reaction efficiency, saves production costs, and has the value of popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the utility model;

[0018] Figure 2 This is a schematic diagram of the circular plate of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the annular bracket and the grid strip of this utility model.

[0020] In the diagram: 1. Pressure gauge; 2. Inspection port; 3. Tower body; 4. Cavity; 5. Feed pipe; 6. Liquid level line; 7. "U"-shaped overflow pipe; 8. Valve; 9. Liquid circulation pump; 10. Liquid circulation pipe; 11. Circular plate; 12. Perforation; 13. Annular support; 14. Gas storage chamber; 15. Gas inlet pipe; 16. Support leg; 17. Observation port; 18. Check valve; 19. Gas connecting pipe; 20. Grille bar. Detailed Implementation

[0021] The present invention can be explained in more detail through the following embodiments. The present invention is not limited to the following embodiments. The purpose of disclosing the present invention is to protect all changes and improvements within the scope of the present invention.

[0022] Combined with appendix Figures 1-3The stripping tower for recovering lithium by extraction method described above includes a tower body 3. A cavity 4 is provided inside the tower body 3. A partition is provided at the lower part of the cavity 4 to divide the cavity 4 below the partition into a gas storage bin 14. The partition includes a circular plate body 11 and an annular support 13. A plurality of through holes 12 are densely arranged on the circular plate body 11. The outer edge of the circular plate body 11 is in close contact with the side wall of the cavity 4. Waterproof and breathable membranes are covered on both the upper and lower bottom surfaces of the circular plate body 11. There are two annular supports 13 which are arranged at the top and bottom of the circular plate body 11 to clamp the circular plate body 11. The outer edge of the annular support 13 is fixedly connected to the side wall of the cavity 4. A plurality of grid bars 20 are arranged at intervals inside the annular support 13. A liquid level line 6 is provided in the upper part of the cavity 4 above the partition. A gas communication pipe 19 which penetrates through the cavity 4 above the liquid level line 6 and the gas storage bin 14 is provided on the outer wall of the tower body 3. A check valve 18 is provided on the gas communication pipe 19. A liquid circulation pipe 10 which penetrates through the part near the partition below the liquid level line 6 and the upper middle part of the cavity 4 below the liquid level line 6 is also provided on the outer wall of the tower body 3. A liquid circulation pump 9 is provided on the liquid circulation pipe 10. A feed pipe 5 which penetrates through the cavity 4 is provided outside the tower body 3 above the liquid level line 6. An air inlet pipe 15 which penetrates through the gas storage bin 14 is provided at the bottom of the tower body 3. A "zigzag" overflow pipe 7 which penetrates through the upper part of the side wall of the cavity 4 below the liquid level line 6 is provided outside the tower body 3. The highest part of the pipe cavity of the "zigzag" overflow pipe 7 is level with the liquid level line 6. A valve 8 is provided at the highest part of the pipe cavity of the "zigzag" overflow pipe 7. A pressure gauge 1 is provided at the top of the tower body 3. An inspection port 2 is provided at the top of the tower body 3. A cover plate is covered on the inspection port 2. A plurality of observation ports 17 are provided at intervals longitudinally on the side wall of the tower body 3. A glass observation window is provided on each observation port 17. Legs 16 are provided at the bottom of the tower body 3.

[0023] Implement the stripping tower for recovering lithium by extraction method of the present utility model. Connect the liquid circulation pump 9 to a switch and a power source respectively. Inject water and a lithium-loaded organic mixed solution along the feed pipe 5 into the cavity 4 to make the liquid level reach the liquid level line 6. The waterproof and breathable membranes covered on both the upper and lower bottom surfaces of the circular plate body 11 prevent the water and the lithium-loaded organic mixed solution from flowing into the gas storage bin 14. Inject carbon dioxide into the gas storage bin 14 along the air inlet pipe 15. The carbon dioxide gas slowly and evenly enters the water and the lithium-loaded organic mixed solution through the waterproof and breathable membrane. Start the liquid circulation pump 9 to draw the water and the lithium-loaded organic mixed solution from the part near the liquid level line 6 to the part near the partition to form a tumbling circulation, which accelerates the contact between the water and the lithium-loaded organic mixed solution and the carbon dioxide gas, makes the solution mixture more uniform, and the gas-liquid contact more sufficient.

[0024] When the pressure in the gas storage bin 14 at the bottom of the tower body 3 is greater than the pressure in the top space of the cavity 4, the one-way valve 18 is in a closed state, and the carbon dioxide gas in the gas storage bin 14 slowly and evenly enters the water and the lithium-containing loaded organic mixed solution through the waterproof breathable membrane for gas-liquid reaction. When the pressure in the gas storage bin 14 at the bottom of the tower body 3 is less than the pressure in the top space of the cavity 4, the one-way valve 18 opens, and the pressure in the top space of the cavity 4 is released into the gas storage bin 14 at the bottom of the tower along the gas communication pipe 19, so that the pressure in the gas storage bin 14 at the bottom of the tower body 3 is greater than the pressure in the top space of the cavity 4, and the reaction can proceed normally;

[0025] When the liquid level of the water and the lithium-containing loaded organic mixed solution in the cavity 4 is slightly lower than or level with the liquid level line 6, there is no liquid in the highest part of the "zigzag" overflow pipe 7. The setting of the "zigzag" overflow pipe 7 can prevent the top space of the cavity 4 from communicating with the outer end of the "zigzag" overflow pipe 7, thereby causing air leakage where the gas storage bin 14 communicates with the outside. When the liquid level of the water and the lithium-containing loaded organic mixed solution is higher than the liquid level line 6, the water and the lithium-containing loaded organic mixed solution flow from one end of the "zigzag" overflow pipe 7 to the highest part of the "zigzag" overflow pipe 7 and are discharged along the other end of the "zigzag" overflow pipe 7, effectively controlling the liquid level height in the tower body 3 and increasing the reaction precision.

[0026] The parts not detailed in the present utility model are prior art.

Claims

1. A stripping column for recovering lithium by extraction, characterized by: It includes a tower body (3). A cavity (4) is provided inside the tower body (3). A partition is provided at the lower part of the cavity (4) to divide the cavity (4) below the partition into a gas storage bin (14). A waterproof and breathable membrane is covered on the partition. A liquid level line (6) is provided at the upper part of the cavity (4) above the partition. A gas communication pipe (19) that penetrates through the cavity (4) above the liquid level line (6) and the gas storage bin (14) is provided on the outer wall of the tower body (3). A check valve (18) is provided on the gas communication pipe (19). A liquid circulation pipe (10) that penetrates through the part near the partition below the liquid level line (6) and the upper middle part of the cavity (4) below the liquid level line (6) is also provided on the outer wall of the tower body (3). A liquid circulation pump (9) is provided on the liquid circulation pipe (10).

2. The stripping column for recovering lithium by extraction according to claim 1, wherein the partition is characterized by It includes a circular plate body (11) and an annular support (13). Perforations (12) are densely distributed on the circular plate body (11). The outer edge of the circular plate body (11) is in close contact with the side wall of the cavity (4). Waterproof and breathable membranes are covered on both the upper and lower bottom surfaces of the circular plate body (11). There are two annular supports (13) which are arranged at the top and bottom of the circular plate body (11) to clamp the circular plate body (11). The outer edge of the annular support (13) is fixedly connected to the side wall of the cavity (4). Multiple grid bars (20) are arranged at intervals inside the annular support (13).

3. The stripping column for recovering lithium by extraction method according to claim 1, characterized in that: A feed pipe (5) that penetrates through the cavity (4) is provided outside the tower body (3) above the liquid level line (6).

4. The stripping column for recovering lithium by extraction method according to claim 1, characterized in that: An air inlet pipe (15) that penetrates through the gas storage bin (14) is provided at the bottom of the tower body (3).

5. The stripping column for recovering lithium by extraction method according to claim 1, characterized in that: A "J"-shaped overflow pipe (7) that penetrates through the upper part of the side wall of the cavity (4) below the liquid level line (6) is provided outside the tower body (3). The highest part of the lumen of the "J"-shaped overflow pipe (7) is level with the liquid level line (6). A valve (8) is provided at the highest part of the lumen of the "J"-shaped overflow pipe (7).

6. The stripping column for recovering lithium by extraction according to claim 1, characterized by: A pressure gauge (1) is provided at the top of the tower body (3).

7. The back-extraction tower for lithium recovery by extraction method according to claim 1, characterized in that: An inspection opening (2) is provided at the top of the tower body (3). A cover plate is covered on the inspection opening (2).

8. The back-extraction tower for lithium recovery by extraction method according to claim 1, characterized in that: in A plurality of observation ports (17) are arranged at intervals along the longitudinal direction on the side wall of the tower body (3). A glass observation window is provided on each observation port (17).

9. The back-extraction tower for lithium recovery by extraction method according to claim 1, characterized in that: Legs (16) are provided at the bottom of the tower body (3).

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