Device for extracting lithium from salt-making mother liquor based on aluminum hydroxide precipitation method

Abstract

The utility model discloses a device for extracting lithium from salt-making mother liquor based on an aluminum hydroxide precipitation method. The device comprises a shell, a plurality of supporting frames are mounted at the lower end of the shell, a liquid discharge pipe is arranged at the bottom in the shell, a filter screen is mounted in the liquid discharge pipe, and an annular electric heating plate is mounted on the inner wall of the shell; the stirring mechanism comprises a top cover arranged above the shell, a motor is installed at the upper end of the top cover, an output shaft of the motor extends into the shell and is fixedly connected with a rotating shaft, and a plurality of first stirring rods are installed on the outer side of the rotating shaft; the lifting mechanism is used for moving the top cover up and down; and the auxiliary mechanism is used for solid-liquid separation and subsequent drying. In the specific operation process of the lithium extraction device, precipitation, filtration, water washing and drying are integrated in one device, so that the overall treatment efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium recovery, in particular to a device for extracting lithium from salt-making mother liquor based on an aluminum hydroxide precipitation method. Background Art

[0002] There are many elements in the brine waste liquid. When treating it, aluminum hydroxide precipitation method is generally used. In the precipitation reaction, NaOH solution is first added dropwise to the brine containing AlCl3·6H2O for precipitation, and then filtered. The filtrate obtained is analyzed for the precipitation of each ion. The obtained precipitate is washed, dried, and then roasted and leached to obtain a lithium ion solution and Al2O3 with a relatively single component. Al2O3 is alkali-dissolved with NaOH solution to obtain NaAlO2 solution. After filtering, the remaining solid is acid-dissolved with concentrated HCl to obtain AlCl3 solution. NaAlO2 solution and AlCl3 solution are added to brine, double hydrolyzed into Al(OH)3 to precipitate lithium ions in the brine.

[0003] In the existing laboratory treatment method, during the above-mentioned treatment process, when performing the precipitation reaction, first take the brine waste liquid, weigh a certain amount of AlCl3·6H2O and add it to the brine, then heat it, and then drop it into the mixed solution to cause lithium precipitation reaction. After the reaction is complete, the lithium precipitation product is obtained after filtration, washing and drying, and then further processed. In the above process, multiple laboratory devices are required and multiple transfers are required, which greatly affects the overall treatment efficiency. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings existing in the prior art, and to propose a lithium extraction device for salt mother liquor based on aluminum hydroxide precipitation method. During the specific operation process, the lithium extraction device integrates precipitation, filtration, water washing and drying into one device, which greatly improves the overall processing efficiency.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A device for extracting lithium from salt mother liquor based on aluminum hydroxide precipitation method, comprising a shell, a plurality of support frames are installed at the lower end of the shell, a drain pipe is provided at the inner bottom of the shell, a filter screen is installed in the drain pipe, and an annular electric heating plate is installed on the inner wall of the shell; a stirring mechanism, the stirring mechanism comprises a top cover arranged above the shell, a motor is installed at the upper end of the top cover, the output shaft of the motor extends to the inside of the shell and is fixedly connected to a rotating shaft, and a plurality of first stirring rods are installed on the outer side of the rotating shaft; a lifting mechanism, the lifting mechanism is used to move the top cover up and down; an auxiliary mechanism, the auxiliary mechanism is used for solid-liquid separation and subsequent drying.

[0007] Preferably, the lower end of the rotating shaft extends into the drain pipe, and a plurality of second stirring rods are fixedly connected to the outer side of the lower end of the rotating shaft at equal intervals.

[0008] Preferably, the lifting mechanism comprises a connecting ring fixedly connected to the outside of the shell, a plurality of hydraulic telescopic rods are installed on the upper end of the connecting ring, and the telescopic ends of the plurality of hydraulic telescopic rods are fixedly connected to the lower end of the top cover.

[0009] Preferably, an annular sealing gasket is fixedly connected to the upper end of the shell.

[0010] Preferably, a manual valve is installed in the drain pipe.

[0011] Preferably, the auxiliary mechanism comprises an adjustable fan installed on the front side of the shell, a hollow ring is installed on the inner wall of the shell, a plurality of air outlets are opened on the inner side of the hollow ring, and the air outlet end of the adjustable fan is connected to the inside of the hollow ring.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The device integrates precipitation reaction, precipitation and filtration, water washing and drying into one. Compared with the existing technology, it does not need to perform multiple transfer operations, which greatly improves the overall processing efficiency. In addition, the use of fans and high-pressure gas can accelerate the filtration work, further improving the overall efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of a lithium extraction device from salt mother liquor based on aluminum hydroxide precipitation method proposed in the utility model;

[0015] Figure 2 for Figure 1 A partial cross-sectional schematic diagram of

[0016] Figure 3 for Figure 2 Enlarged view of point A.

[0017] In the figure: 1 shell, 2 support frame, 3 connecting ring, 4 hydraulic telescopic rod, 5 top cover, 6 motor, 7 adjustable fan, 8 shaft, 9 first stirring rod, 10 drain pipe, 11 second stirring rod, 12 filter screen, 13 annular electric heating plate, 14 hollow ring, 15 air blast port, 16 annular sealing gasket. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0019] Reference Figure 1-Figure 3 , a device for extracting lithium from mother liquor of salt production based on aluminum hydroxide precipitation method, comprising a shell 1, a plurality of support frames 2 are installed at the lower end of the shell 1, the overall size of the device can be designed according to actual needs, such as in a laboratory, the overall size can be proportionally reduced, in some processing environments, the overall size can be proportionally enlarged, a drain pipe 10 is arranged at the inner bottom of the shell 1, a filter screen 12 is installed in the drain pipe 10, an annular electric heating plate 13 is installed on the inner wall of the shell 1, the lower end of the rotating shaft 8 extends into the drain pipe 10, a plurality of second stirring rods 11 are fixedly connected to the outer side of the lower end of the rotating shaft 8 at equal intervals, and a manual valve is installed in the drain pipe 10;

[0020] The stirring mechanism includes a top cover 5 disposed above the housing 1, a motor 6 is installed on the upper end of the top cover 5, and the motor 6 is a servo motor capable of changing the rotation speed. The output shaft of the motor 6 extends into the housing 1 and is fixedly connected to a rotating shaft 8 (a rotating sealing gasket is installed at the output shaft passing through the top cover 5), and a plurality of first stirring rods 9 are installed on the outer side of the rotating shaft 8;

[0021] The lifting mechanism is also included, and the lifting mechanism is used to move the top cover 5 up and down. The lifting mechanism includes a connecting ring 3 fixedly connected to the outside of the shell 1, and a plurality of hydraulic telescopic rods 4 are installed on the upper end of the connecting ring 3. The telescopic ends of the plurality of hydraulic telescopic rods 4 are fixedly connected to the lower end of the top cover 5, and the upper end of the shell 1 is fixedly connected to an annular sealing gasket 16;

[0022] It also includes an auxiliary mechanism, which is used for solid-liquid separation and subsequent drying. The auxiliary mechanism includes an adjustable fan 7 installed on the front side of the shell 1. A hollow ring 14 is installed on the inner wall of the shell 1. A plurality of air vents 15 are opened on the inner side of the hollow ring 14. The air outlet end of the adjustable fan 7 is connected to the inside of the hollow ring 14.

[0023] In the utility model, the device is first started. During the specific operation, the device is located on the test bench. The user first extends the hydraulic telescopic rod 4 to move the top cover 5 to a higher height, and then puts an appropriate amount of brine waste liquid on the top of the shell 1, and then adds an appropriate amount of AlCl3·6H2O, and then adds an appropriate amount of 1mol / L NaOH solution to perform lithium precipitation reaction. During the reaction, the annular electric heating plate 13 is used to keep the liquid inside the shell 1 at a suitable temperature. During this process, the motor 6 can also be started to allow the rotating shaft 8 to drive the first stirring rod 9 and the second stirring rod 11 to rotate, so that the liquid is evenly mixed, which can not only make the reaction liquid react more evenly, but also make the internal temperature more uniform, thereby ensuring the reaction effect;

[0024] After a period of time, the motor 6 is turned off to carry out precipitation work, and the aluminum-lithium co-precipitate is precipitated to the bottom of the shell 1. After the precipitation is completed, a liquid collection box (i.e., on the experimental table) is placed below the shell 1, and the hydraulic telescopic rod 4 is started to contract, so that the top cover 5 is in contact with the annular sealing gasket 16, so that the inside of the shell 1 is sealed, and then the valve of the drain pipe 10 is opened, and the adjustable fan 7 is started. After the adjustable fan 7 injects high-pressure gas, the solution in the shell 1 will be quickly pressed out to increase the separation rate;

[0025] After the separation is completed, the liquid collection box at the bottom is replaced with a waste liquid collection box. The manual valve is closed first, and then the staff moves the top cover 5 up and adds an appropriate amount of clean water. Then the top cover 5 is moved down, and the motor 6 is started to stir the sediment to fully contact with the clean water for water washing. After the water washing is completed, the manual valve is opened again, and then the adjustable fan 7 is started to press out the water. After multiple reciprocating water washing operations, some clean water is still attached to the surface of the sediment. On the basis of covering the top cover 5, the adjustable fan 7 is started to inject high-temperature gas, and the motor 6 is started to rotate slowly. The second stirring rod 11 can be used to stir the sediment. The gaps of the sediment are constantly changing, so that the high-temperature gas is discharged from the drain pipe 10 after passing through these gaps, and the sediment will eventually be air-dried.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lithium extraction device for salt making mother liquor based on aluminum hydroxide precipitation method, It is characterized in that include: A shell (1), a plurality of support frames (2) are installed at the lower end of the shell (1), a liquid discharge pipe (10) is provided at the inner bottom of the shell (1), a filter screen (12) is installed in the liquid discharge pipe (10), and an annular electric heating plate (13) is installed on the inner wall of the shell (1); A stirring mechanism, the stirring mechanism comprising a top cover (5) arranged above the shell (1), a motor (6) being mounted on the upper end of the top cover (5), an output shaft of the motor (6) extending into the interior of the shell (1) and being fixedly connected to a rotating shaft (8), a plurality of first stirring rods (9) being mounted on the outer side of the rotating shaft (8); A lifting mechanism, the lifting mechanism being used to move the top cover (5) up and down; Auxiliary mechanism, which is used for solid-liquid separation and subsequent drying.

2. A lithium extraction device for salt making mother liquor based on aluminum hydroxide precipitation method according to claim 1, It is characterized in that The lower end of the rotating shaft (8) extends into the liquid discharge pipe (10), and a plurality of second stirring rods (11) are fixedly connected at equal intervals to the outer side of the lower end of the rotating shaft (8).

3. The lithium extraction device from salt making mother liquor based on aluminum hydroxide precipitation method according to claim 1, It is characterized in that The lifting mechanism comprises a connecting ring (3) fixedly connected to the outside of the shell (1), a plurality of hydraulic telescopic rods (4) are installed on the upper end of the connecting ring (3), and the telescopic ends of the plurality of hydraulic telescopic rods (4) are fixedly connected to the lower end of the top cover (5).

4. The device for extracting lithium from salt-making mother liquor based on aluminum hydroxide precipitation method according to claim 1, It is characterized in that An annular sealing gasket (16) is fixedly connected to the upper end of the housing (1).

5. The device for extracting lithium from salt-making mother liquor based on aluminum hydroxide precipitation method according to claim 1, It is characterized in that A manual valve is installed in the liquid discharge pipe (10).

6. The device for extracting lithium from salt-making mother liquor based on aluminum hydroxide precipitation method according to claim 1, It is characterized in that The auxiliary mechanism comprises an adjustable fan (7) installed on the front side of the shell (1); a hollow ring (14) is installed on the inner wall of the shell (1); a plurality of air blast ports (15) are provided on the inner side of the hollow ring (14); and an air outlet end of the adjustable fan (7) is connected to the interior of the hollow ring (14).

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