Scar cleaning method for aluminum-based lithium-containing material desorption device

Abstract

Compared with the prior art, the scar cleaning method for the aluminum-based lithium-containing material desorption device has the following beneficial effects that scars can be efficiently cleaned, elbows of all layers of pipelines do not need to be disassembled, and a large amount of manpower and financial resources are saved; aluminum oxide can be recycled in the alkali washing process; the method comprises the following steps of: 1, pumping the liquid caustic soda in the liquid caustic soda tank, enabling the liquid caustic soda to sequentially pass through an inner tube of the tubular heat exchanger and the reaction kettle, heating the reaction kettle, and heating the liquid caustic soda to increase the temperature; 2, the heated liquid caustic soda returns to an outer pipe of the tubular heat exchanger in a circulating mode and flows back to the liquid caustic soda tank through the outer pipe; and step 3, keeping the alkali liquor circulating in the inner pipe, the reaction kettle and the outer pipe, gradually raising the temperature of the alkali liquor until the temperature of the alkali liquor in the reaction kettle reaches a preset temperature T, keeping the preset temperature T, and continuously keeping the alkali liquor circulating in the inner pipe, the reaction kettle and the outer pipe for a preset time t to finish alkali washing.

Description

Technical Field

[0001] The invention relates to the technical field of lithium salt preparation, and in particular to a method for cleaning scabs used in a desorption device for aluminum-based lithium-containing materials. Background Art

[0002] In the device for continuously removing lithium carbonate from lithium-containing aluminum hydroxide, since the desorption device uses cold material to enter from the inner tube of the shell and tube preheater, and then enters the reactor for steam heating to raise the temperature, the material is circulated back to the outer tube of the shell and tube preheater after heating, and the inner tube material and the outer tube use direct heat exchange. In this process, scarring will occur on the walls of the inner and outer tubes. The scars on some inner tubes are very hard because they contain multiple complex components such as lithium carbonate, aluminum-based materials and boehmite, and cannot be effectively cleaned by hydraulic cleaning. At the same time, because the outer tube is covered with an inner tube, the cleaning nozzle cannot enter the inner part of the outer tube. Due to the characteristics of the scars and the structure of the device, they cannot be removed by hydraulic cleaning. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned problem and provide a method for cleaning the scabs of an aluminum-based lithium-containing material desorption device, which can be applied to the cleaning of the scabs of an aluminum-based lithium-containing material desorption device, and the scabs can be effectively cleaned by this method.

[0004] To achieve the above object, the technical solution of the present invention is: a method for cleaning scabs in an aluminum-based lithium-containing material desorption device, comprising the following steps: Step 1, pumping the liquid alkali in the liquid alkali tank to apply pressure, so that the alkali liquid passes through the inner tube of the tubular heat exchanger and the reactor in sequence, and at the same time heating the reactor to heat the alkali liquid; Step 2: The heated and heated liquid caustic soda is circulated back to the outer tube of the tubular heat exchanger and then flows back to the liquid caustic soda tank through the outer tube; Step 3: Keep the alkali solution circulating in the inner tube, the reactor and the outer tube to gradually increase the temperature of the alkali solution until the temperature of the liquid alkali in the reactor reaches a predetermined temperature T, maintain the predetermined temperature T, and continue to keep the alkali solution circulating in the inner tube, the reactor and the outer tube for a predetermined time t to complete the alkali washing.

[0005] Furthermore, in step three, during the process of gradually raising the temperature of the alkali solution, the delivery pressure range of the liquid alkali is: 5Mpa-7.5Mpa.

[0006] Furthermore, the predetermined temperature T has a value range of 140°C-150°C.

[0007] Furthermore, in step three, the temperature of the alkali solution is increased by 6°C-7°C per hour.

[0008] Furthermore, the value range of the predetermined time length t is: 4 hours - 6 hours.

[0009] Furthermore, the concentration of the liquid caustic soda in the liquid caustic soda tank is 230 g / L-250 g / L.

[0010] Furthermore, it also includes: Step 4: After the alkali cleaning of the device is completed, stop pumping the alkali solution and release the pressure in the inner tube, outer tube and reactor; Step 5: After the pressure is released, clean water is pumped into the inner tube, outer tube and reactor of the tubular heat exchanger to wash the inside of the pipes.

[0011] Further, in step 4, the pressure relief of the inner tube, the outer tube and the reactor comprises: The pumping device for pumping the alkali solution stops working, and when the pressure in the reactor drops to a second predetermined value, the drain valve of the reactor is opened to release the pressure. The second predetermined value ranges from 0.08 Mpa to 0.12 Mpa.

[0012] Further, in step 5, washing the inside of the pipeline includes: Open the short-circuit pipeline, short-circuit the reactor, isolate the reactor, and connect the inner tube and the outer tube; Pump clean water into the inner pipe, so that the clean water flows through the inner pipe and the outer pipe in sequence, and pushes the alkali liquid in the inner pipe and the outer pipe back to the liquid alkali tank; Open the discharge valve of the reactor to drain the liquid alkali in the reactor; After the reactor is emptied, the short-circuit pipeline is closed to allow clean water to flow through the inner tube, the reactor and the outer tube in sequence for a third predetermined time to complete the water washing.

[0013] Furthermore, the third predetermined time period ranges from 50 minutes to 70 minutes.

[0014] The present invention discloses a method for cleaning scabs of an aluminum-based lithium-containing material desorption device, comprising the steps of: pumping liquid alkali in a liquid alkali tank to apply pressure, so that the alkali solution passes through an inner tube of a tubular heat exchanger and a reactor in sequence, and heating the reactor at the same time to heat and raise the temperature of the alkali solution; step 2, circulating the heated and heated liquid alkali back to the outer tube of the tubular heat exchanger, and returning to the liquid alkali tank through the outer tube; step 3, keeping the alkali solution circulating in the inner tube, the reactor and the outer tube to gradually raise the temperature of the alkali solution until the temperature of the liquid alkali in the reactor reaches a predetermined temperature T, maintaining the predetermined temperature T, and continuously keeping the alkali solution circulating in the inner tube, the reactor and the outer tube for a predetermined time t, and completing alkali washing. Compared with the prior art, the method has the following beneficial effects: 1. Compared with the problems that cannot be solved by hydraulic cleaning, this method achieves efficient removal of scars.

[0015] 2. Material recovery: During the alkali washing process, on the one hand, the alumina in the scab is recovered; on the other hand, the liquid alkali can be directly returned to the alumina production system for system alkali replenishment without causing any waste.

[0016] 3. Compared with hydraulic cleaning, there is no need to dismantle the elbows of each layer of pipes, which saves a lot of manpower and financial resources; reduces pollution to the on-site environment and protects the on-site environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic flow chart of an implementation method of a method for cleaning scabs in an aluminum-based lithium-containing material desorption device.

[0018] Figure 2 The present invention is a schematic flow chart of a second embodiment of a method for cleaning scabs in an aluminum-based lithium-containing material desorption device.

[0019] Figure 3 The present invention is a schematic flow chart of washing the inside of a pipeline in a method for cleaning scabs in an aluminum-based lithium-containing material desorption device.

[0020] Figure 4 It is a structural schematic diagram of the first embodiment of the cleaning system in a method for cleaning scabs in an aluminum-based lithium-containing material desorption device of the present invention.

[0021] Figure 5 It is a structural schematic diagram of a second embodiment of a cleaning system in a method for cleaning scabs in an aluminum-based lithium-containing material desorption device according to the present invention.

[0022] In the figure: 1, alkali solution tank; 11, first control valve; 2. Booster pump; 3. Diaphragm pump; 4. Casing preheater; 41. Inner tube; 42. Outer tube; 5. Reactor; 50. Discharge valve; 51. Circulation pipeline; 52. Second control valve; 53. Third control valve; 54. Short-circuit pipeline; 55. Fourth control valve; 6. Steam delivery pipeline; 61. Fifth control valve; 7. Water tank; 71. Sixth control valve. DETAILED DESCRIPTION

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and thus only show the components related to the present invention.

[0024] Embodiment 1 Please refer to Figure 1 A method for cleaning scabs in an aluminum-based lithium-containing material desorption device comprises the following steps: Step 1, pumping the liquid alkali in the liquid alkali tank to apply pressure, so that the alkali liquid passes through the inner tube of the tubular heat exchanger and the reactor in sequence, and at the same time heating the reactor to heat the alkali liquid; Step 2: The heated and heated liquid caustic soda is circulated back to the outer tube of the tubular heat exchanger and then flows back to the liquid caustic soda tank through the outer tube; Step 3: Keep the alkali solution circulating in the inner tube, the reactor and the outer tube to gradually increase the temperature of the alkali solution until the temperature of the liquid alkali in the reactor reaches a predetermined temperature T, maintain the predetermined temperature T, and continue to keep the alkali solution circulating in the inner tube, the reactor and the outer tube for a predetermined time t to complete the alkali washing.

[0025] Specifically, refer to Figure 4 As an implementation method, the working process of the aluminum-based lithium-containing material desorption device is as follows: the device includes a slurry tank (not shown in the figure) connected to the feed end of the booster pump 2. When working, the booster pump 2 and the diaphragm pump 3 work to pump the slurry to the inner tube 41 of the tubular heat exchanger 4, and then enter the reactor 5 after passing through the inner tube 41. The slurry is heated by the reactor, and then flows out of the reactor and enters the outer tube of the tubular heat exchanger 4. The high-temperature slurry exchanges heat with the low-temperature slurry in the inner tube. In this process, heat is generated on the side wall of the inner tube, the reactor, the reactor inlet and outlet pipes, and the inner wall of the outer tube. The technical solution of the present application is as follows: it comprises a liquid alkali tank 1 and a water tank 7 connected to a booster pump 2, the initial temperature of the liquid alkali in the liquid alkali tank is 35°C-40°C, a first control valve 11 is arranged between the booster pump 2 and the liquid alkali tank 1, a sixth control valve 71 is arranged between the water tank 7 and the booster pump 2, the output end of the booster pump 2 is connected to a diaphragm pump 3, the output end of the diaphragm pump 3 is connected to the inner tube of the tubular heat exchanger 4, the other end of the inner tube is connected to the reactor 5, the reactor 5 comprises a circulation pipeline 51 connected to the outer tube 42, the circulation pipeline 51 is provided with a fourth control valve 55, the inner tube A second control valve 52 is arranged between the output end and the reactor, and also includes a short-circuit pipeline 54, one end of the short-circuit pipeline 54 is connected with one end of the second control valve 52 close to the inner tube 41, and the other end of the short-circuit pipeline 54 is connected with one end of the fourth control valve 55 close to the outer tube, and a third control valve 53 is arranged on the short-circuit pipeline 54. During initial operation, the second control valve 52 is opened, the sixth control valve 71 is closed, the first control valve 11 and the fourth control valve 55 are opened, and the third control valve 53 is closed. The booster pump and the diaphragm pump work to pump the alkali solution in the alkali solution tank 1 through the inner tube and then enter The reactor 5 is heated in the reactor and then flows into the outer tube 42 through the circulation pipeline 51. The alkali liquid in the outer tube exchanges heat with the alkali liquid in the inner tube, and the temperature of the alkali liquid is gradually increased. When the temperature of the alkali liquid is increased to a predetermined temperature T, the temperature is maintained so that the alkali liquid circulates in the system for a predetermined time t. Since the main components of the scab in the system pipeline are lithium carbonate, aluminum-based materials and boehmite, they can react with the alkali liquid, thereby achieving the purpose of removing the scab. The method is to clean the scab through the equipment included in the aluminum-based material desorption device, and the scab can be recycled after treatment.

[0026] Further, refer to Figure 4 The reactor is connected to a steam delivery pipeline 6, a fifth control valve 61 is provided between the steam delivery pipeline and the reactor 5, the steam delivery pipeline is connected to the bottom of the reactor, and the internal material is directly heated by high-temperature and high-pressure steam.

[0027] Further, refer to Figure 5 As another embodiment, in the actual implementation process, the aluminum-based lithium-containing material desorption device includes a plurality of tubular heat exchangers 4 arranged in series and five reactors 5 arranged in series. A fifth control valve 61 is arranged between each reactor and the steam delivery pipeline. In this embodiment, the alkali solution is delivered to the inner tube 41 by the booster pump 2 and the diaphragm pump 3. The alkali solution flows through the inner tubes of the tubular heat exchangers 4 arranged in series in turn, and then flows through the five reactors in turn. After flowing out of the reactor, it flows through the outer tubes of the plurality of tubular heat exchangers 4 in turn, and then flows back to the alkali solution tank 1. In this process, the initial temperature of the liquid alkali is 35°C-40°C, and the NK concentration of the liquid alkali is 230 g / L-250g / L. In the direction away from the tubular heat exchanger 4, the steam flow rate introduced into the five reactors 5 decreases in turn, and the specific ratio of the flow rate is: 17:15:12:8:5, and the alkali solution is gradually heated and the temperature is raised.

[0028] Specifically, the steam flow rate entering each reactor can be controlled by controlling the fifth control valve 61 on each reactor 5. The opening is proportional to the steam flow rate. The larger the opening of the fifth control valve 61, the larger the steam flow rate entering. The openings of the five specific fifth control valves are 17%, 15%, 12%, 8%, and 5%, respectively. At the same time, the pressure of the steam buffer tank must be controlled to be higher than the pressure in the reactor by more than 0.5-1.0 Mpa. Only when the steam pressure is higher than the pressure in the reactor can the steam be ensured to be able to normally enter the bottom of the reactor for continuous heating and temperature increase without material backpressure.

[0029] Furthermore, at the initial stage of alkali washing, the diaphragm pump is pre-pressed with 0.25-0.3Mpa, and the operating frequency of the diaphragm pump is 30HZ to ensure that the pressure of the pumped alkali solution is about 6.5Mpa. During the circulation of the alkali solution, the diaphragm pump pressure drops by 0.5Mpa every time, and the diaphragm pump Hertz is controlled to be 0.5HZ to increase the amount of alkali fed. The steam valve opening is adjusted in time and the heating rate of the liquid alkali in the reactor is controlled at 6℃-7℃ per hour. After 14 hours of cyclic heating, when the temperature of the liquid alkali in the reactor rises to 140℃, the steam valve is gradually closed. After half an hour of adjustment, only the fifth control valve 61 of the 1# reactor close to the tubular heat exchanger is opened by 3%-5%, and the fifth control valves 61 of the steam in the other reactors are all closed to maintain the temperature of the reactor at 140℃-150℃. After stabilizing the temperature for 4-6 hours, the diaphragm pump Hertz is stabilized to 42.8HZ, and the diaphragm pump feed flow rate is controlled at 55m 3 / h, the working pressure of the diaphragm pump dropped from 7.5 Mpa to 5.1 Mpa, and the fifth control valve 61 on the 1# reactor was closed to stop the heating of liquid alkali, and the temperature-raising alkali washing of the device was completed.

[0030] Further, as a specific implementation method, in step 3, during the process of gradually raising the temperature of the alkali solution, the delivery pressure of the liquid alkali is in the range of 5Mpa-7.5Mpa. Controlling the delivery pressure of the liquid alkali within the range of 5Mpa-7.5Mpa can ensure the delivery flow of the liquid alkali while avoiding the risks caused by excessive pressure, thereby improving the alkali washing efficiency under the premise of safe construction.

[0031] Further, as a specific implementation, the predetermined temperature T has a value range of 140°C-150°C. Specifically, according to statistics, when the concentration of the alkali solution is in the range of 230 g / L-250 g / L and the temperature is controlled at 140°C-150°C, the cleaning efficiency of the scab is the best.

[0032] Specifically, the relationship between the scab cleaning speed and the liquid alkali concentration and liquid alkali temperature is shown in the following table: Specifically, it can be seen from the above table that when the alkali solution concentration is 245 g / L and the temperature is 145°C, the scab treatment effect is best. Therefore, the alkali solution concentration is preferably 245 g / L and the reaction temperature is preferably 145°C.

[0033] Furthermore, in step three, the temperature raising rate of the alkali solution is 6°C-7°C per hour. Specifically, the temperature raising rate of the liquid alkali is controlled at 6°C-7°C per hour, which can ensure the safe operation of the equipment.

[0034] Furthermore, the value range of the predetermined time length t is: 4 hours - 6 hours.

[0035] Furthermore, the concentration of the liquid caustic soda in the liquid caustic soda tank is 230 g / L-250 g / L.

[0036] Embodiment 2 The present application discloses a method for cleaning the scabs of an aluminum-based lithium-containing material desorption device, referring to Figure 2 , including the following steps: Step 1, pumping the liquid alkali in the liquid alkali tank to apply pressure, so that the alkali liquid passes through the inner tube of the tubular heat exchanger and the reactor in sequence, and at the same time heating the reactor to heat the alkali liquid; Step 2: The heated and heated liquid caustic soda is circulated back to the outer tube of the tubular heat exchanger and then flows back to the liquid caustic soda tank through the outer tube; Step 3: Keep the alkali solution circulating in the inner tube, the reactor and the outer tube to gradually increase the temperature of the alkali solution until the temperature of the liquid alkali in the reactor reaches a predetermined temperature T, keep the predetermined temperature T, and continue to keep the alkali solution circulating in the inner tube, the reactor and the outer tube for a predetermined time t, and then complete the alkali washing; and further include: Step 4: After the alkali cleaning of the device is completed, stop pumping the alkali solution and release the pressure in the inner tube, outer tube and reactor; Further, in step 4, the pressure relief of the inner tube, the outer tube and the reactor comprises: The pumping device for pumping the alkali solution stops working, and when the pressure in the reactor drops to a second predetermined value, the drain valve of the reactor is opened to release the pressure, and the second predetermined value is less than 0.05 Mpa.

[0037] Specifically, in this embodiment, the alkali washing work process of steps 1 to 3 is consistent with that in Example 1. After the alkali washing process is completed, the booster pump 2 and the diaphragm pump 3 are controlled to stop working, and the supply of liquid alkali to the entire device is stopped. Part of the liquid alkali continues to flow back to the liquid alkali tank, and the pressure of the liquid alkali in the inner tube 41, the outer tube 42 and the reactor decreases. After the diaphragm pump and the booster pump stop working for 55 minutes to 65 minutes, when the pressure in the reactor drops to the second predetermined value, the five drain valves (not shown in the figure) of the five reactors are opened to cool and reduce the pressure of the reactors. The drain valve opening is gradually increased according to the speed of pressure drop, and is gradually opened from 10% to 50% to ensure that the exhaust steam is slowly and steadily emptied.

[0038] Step 5: After the pressure is released, clean water is pumped into the inner tube, outer tube and reactor of the tubular heat exchanger to wash the inside of the pipes.

[0039] Further, in step 5, washing the inside of the pipeline includes: Open the short-circuit pipeline, short-circuit the reactor, isolate the reactor, and connect the inner tube and the outer tube; Pump clean water into the inner pipe, so that the clean water flows through the inner pipe and the outer pipe in sequence, and pushes the alkali liquid in the inner pipe and the outer pipe back to the liquid alkali tank; Open the discharge valve of the reactor to drain the liquid alkali in the reactor; After the reactor is emptied, the short-circuit pipeline is closed to allow clean water to flow through the inner tube, the reactor and the outer tube in sequence for a third predetermined time to complete the water washing.

[0040] Specifically, refer to Figure 4 , Figure 5 After the reactor 5 is emptied, the second control valve 52 and the fourth control valve 55 are controlled to be closed, and the third control valve 53 is controlled to be opened, so that the short-circuit pipe 54 connects the inner tube 41 and the outer tube 42, and 11 is controlled to be closed, the sixth control valve 71 is opened, and then the booster pump 2 and the diaphragm pump 3 are controlled to pump clean water into the inner tube, and the liquid alkali in the inner tube and the outer tube is pushed out with clean water and returned to the liquid alkali tank. In this process, the diaphragm pump 3 works at 40HZ, and this step is continued for 1 hour, and all the liquid alkali inside the inner tube and the outer tube is pushed back to the liquid alkali tank, and the cleaning water replaces the liquid alkali and is stored in the inner tube and the outer tube.

[0041] Furthermore, when the reactor 5 is depressurized to normal atmospheric pressure, the discharge valve 50 at the bottom of the reactor 5 is opened to discharge the liquid alkali in the reactor. During the discharge process, the discharged liquid alkali can be recovered into the liquid alkali tank 1 by re-pumping until the liquid alkali in the reactor is completely discharged.

[0042] Furthermore, after the alkali liquid in the reactor is drained, the discharge valve 50 and the third control valve 53 are closed, the second control valve 52 and the fourth control valve 55 are opened, and then the diaphragm pump and the booster pump are controlled to pump the cleaning liquid. At this time, the cleaning liquid enters the reactor 5 after passing through the inner tube 41, flows into the outer tube 42 after passing through the reactor, and is then discharged from the outer tube. This continues for a third predetermined time period. This step is completed after 1 hour of water washing.

[0043] Furthermore, the third predetermined time period ranges from 50 minutes to 70 minutes, preferably 60 minutes.

[0044] Furthermore, after the water washing is completed, steam is provided to the reactor 5 to carry out water circulation to increase the temperature in preparation for cutting the material of the device.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for cleaning scabs in an aluminum-based lithium-containing material desorption device, characterized in that: The following steps are involved: Step 1, pumping the liquid alkali in the liquid alkali tank to apply pressure, so that the alkali liquid passes through the inner tube of the tubular heat exchanger and the reactor in sequence, and at the same time heating the reactor to heat the alkali liquid; Step 2: The heated and heated liquid caustic soda is circulated back to the outer tube of the tubular heat exchanger and then flows back to the liquid caustic soda tank through the outer tube; Step 3: Keep the alkali solution circulating in the inner tube, the reactor and the outer tube to gradually increase the temperature of the alkali solution until the temperature of the liquid alkali in the reactor reaches a predetermined temperature T, maintain the predetermined temperature T, and continue to keep the alkali solution circulating in the inner tube, the reactor and the outer tube for a predetermined time t to complete the alkali washing.

2. The method for cleaning the scab of the aluminum-based lithium-containing material desorption device according to claim 1, characterized in that: In step three, during the process of gradually raising the temperature of the alkali solution, the delivery pressure range of the liquid alkali is: 5Mpa-7.5Mpa.

3. The method for cleaning the scab of the aluminum-based lithium-containing material desorption device according to claim 1, characterized in that: The predetermined temperature T has a value range of 140°C-150°C.

4. The method for cleaning the scab of the aluminum-based lithium-containing material desorption device according to claim 1, characterized in that: In step three, the temperature of the alkali solution is increased by 6°C to 7°C per hour.

5. The method for cleaning scabs in a desorption device for aluminum-based lithium-containing materials according to claim 1, characterized in that: The value range of the scheduled time t is: 4 hours - 6 hours.

6. The method for cleaning scabs in a desorption device for aluminum-based lithium-containing materials according to claim 1, characterized in that: The concentration of liquid caustic soda in the liquid caustic soda tank is 230 g / L -250g / L.

7. The method for cleaning scabs in a desorption device for aluminum-based lithium-containing materials according to claim 1, characterized in that: Also includes: Step 4: After the alkali cleaning of the device is completed, stop pumping the alkali solution and release the pressure in the inner tube, outer tube and reactor; Step 5: After the pressure is released, clean water is pumped into the inner tube, outer tube and reactor of the tubular heat exchanger to wash the inside of the pipes.

8. The method for cleaning scabs in a desorption device for aluminum-based lithium-containing materials according to claim 7, characterized in that: In step 4, the inner tube, the outer tube and the reactor are depressurized, including: Stop pumping the alkali solution, and when the pressure in the reactor drops to a second predetermined value, open the drain valve of the reactor to release the pressure. The second predetermined value ranges from 0.08 Mpa to 0.12 Mpa.

9. The method for cleaning scabs in a desorption device for aluminum-based lithium-containing materials according to claim 7, characterized in that: In step 5, washing the inside of the pipeline includes: Open the short-circuit pipeline, short-circuit the reactor, isolate the reactor, and connect the inner tube and the outer tube; Pump clean water into the inner pipe, so that the clean water flows through the inner pipe and the outer pipe in sequence, and pushes the alkali liquid in the inner pipe and the outer pipe back to the liquid alkali tank; Open the discharge valve of the reactor to drain the liquid alkali in the reactor; After the reactor is emptied, the short-circuit pipeline is closed to allow clean water to flow through the inner tube, the reactor and the outer tube in sequence for a third predetermined time to complete the water washing.

10. The method for cleaning scabs in a desorption device for aluminum-based lithium-containing materials according to claim 7, characterized in that: The third predetermined time period ranges from 50 minutes to 70 minutes.

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