Combined device for extracting lithium from lithium-containing salt lake brine

Abstract

The utility model relates to the technical field of salt lake lithium extraction, in particular to a lithium-containing salt lake brine lithium extraction combined device which comprises a plc control system box, a separation liquid tank and an evaporative crystallization tank, the evaporative crystallization tank is arranged at the top end of the separation liquid tank, and connecting flange plates are fixedly installed on the periphery of the top end of the separation liquid tank and the periphery of the bottom end of the evaporative crystallization tank. The connecting flange plates are fixedly connected through connecting bolts, the evaporative crystallization tank comprises a main tank body, a separating and filtering frame, a stirrer, a sealing tank cover and a stirring motor, and the whole device does not need to be overturned during crystallization and filtering, so that the risk that an existing combined device for extracting lithium from lithium-containing salt lake brine is prone to leakage in the filtering process is avoided; and the whole device is stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium extraction from salt lakes, in particular to a lithium-containing salt lake brine lithium extraction combined device. Background Art

[0002] The precipitation method is the most common method for extracting lithium from salt lakes. The principle is to use solar energy to naturally evaporate and concentrate the salt lake brine. After removing impurities by deboronization, calcium removal, and magnesium removal, a mixed precipitant or salting-out agent is added to the mother liquor to separate the lithium in the form of a precipitate. The precipitation method for extracting metallic lithium has been used in industry for a long time. The process is mature, simple to operate, and highly reliable. However, the traditional salt lake brine solar pool has a single function and cannot achieve multiple steps of evaporation, crystallization, and filtration. At the same time, the temperature controllability is low, which prolongs the entire extraction cycle and causes low extraction efficiency.

[0003] And in the application document with publication number CN219058781U, a lithium extraction combined device for lithium-containing salt lake brine is mentioned. The lithium extraction combined device for lithium-containing salt lake brine can effectively overcome the defect of single function of existing salt lake brine solar pool by setting a combined base, evaporation crystallization filter box, flip motor and transmission shaft, and can realize multiple steps of evaporation crystallization filtration. At the same time, the temperature is controllable, thereby shortening the entire extraction cycle, and the extraction efficiency is high, thereby effectively solving the above-mentioned problems. However, the overall structure still has certain defects and deficiencies, which need to be optimized. The specific defects and deficiencies are as follows: the evaporation crystallization filter box in the lithium extraction combined device for lithium-containing salt lake brine needs to be flipped upside down during filtration, and there is no anti-seepage measure at the brine inlet mechanism. At the same time, when the flip motor is working, the automatic flipping is only realized by the transmission shaft, and there is no auxiliary positioning structure, which easily leads to the risk of leakage at the brine inlet mechanism after the evaporation crystallization filter box is flipped, and the stability of the overall box body cannot be guaranteed during the flipping process.

[0004] Therefore, it is necessary to design a lithium-extraction combined device for lithium-containing salt lake brine to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of the utility model is to provide a combined device for extracting lithium from lithium-containing salt lake brine, which does not need to be turned over during crystallization filtration, not only avoiding the risk of leakage in the existing combined device for extracting lithium from lithium-containing salt lake brine during the filtration process, but also making the overall device stable and reliable, thereby solving the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A lithium extraction combined device for lithium-containing salt lake brine comprises a PLC control system box, a separation liquid tank and an evaporation crystallization tank, wherein the top of the separation liquid tank is provided with an evaporation crystallization tank, and connecting flanges are fixedly installed around the top of the separation liquid tank and around the bottom of the evaporation crystallization tank, and the connecting flanges are fixedly connected by connecting bolts, and the evaporation crystallization tank comprises a main tank body, a separation filter frame, a stirrer, a sealed tank cover and a stirring motor.

[0008] As a preferred solution of the utility model, the separation filter frame is fixedly installed inside the main tank body near the bottom end, the agitator is movably installed at the center of the top surface of the separation filter frame, the sealed tank cover is fixedly installed on the top surface of the main tank body by bolts, the stirring motor is fixedly installed at the center of the top surface of the sealed tank cover by bolts, and the output shaft of the stirring motor and the agitator are fixedly connected by a coupling.

[0009] As a preferred solution of the utility model, the main tank body includes an outer shell, the inner wall of the outer shell is provided with an insulation layer and an inner tank with a resistance heating component in sequence from the outside to the inside, the outer surface of the main tank body is penetrated by an evaporation tube, a brine tube with an electric valve and a precipitant tube with an electric valve near the top, the outer surface of the main tank body is fixedly installed with an electrical connection terminal of the resistance heating component, the outer surface of the main tank body is penetrated by a crystallization outlet channel with a valve near the top surface of the separation filter frame, and the center of the bottom surface of the main tank body is penetrated by a separation liquid tube with an electric valve.

[0010] As a preferred solution of the utility model, the top surface of the separation filter frame is provided with an inclined end surface, and the lowest end of the inclined end surface is located close to the crystallization outlet channel with a valve.

[0011] As a preferred solution of the utility model, a liquid phase cavity is opened inside the separation liquid tank, a digital heavy metal ion detection sensor is embedded in the outer surface of the separation liquid tank, a discharge nozzle with an electric valve is installed through the center of the bottom end of the separation liquid tank, and supporting legs are fixedly installed around the bottom end of the separation liquid tank.

[0012] As a preferred solution of the utility model, the diameter of the separation liquid tank is slightly larger than the diameter of the evaporation crystallization tank, and the height of the separation liquid tank is slightly smaller than the height of the evaporation crystallization tank.

[0013] Beneficial effect: The evaporation crystallization filter box in the existing lithium-containing salt lake brine lithium extraction combination device needs to be turned upside down during filtration, and there is no anti-seepage measure at the brine inlet mechanism. At the same time, when the turning motor is working, the automatic turning is only achieved through the transmission shaft, and there is no auxiliary positioning structure. This will easily lead to the risk of leakage at the brine inlet mechanism after the evaporation crystallization filter box is turned over, and the stability of the entire box cannot be guaranteed during the turning process. The utility model can be combined with the separation liquid tank and the evaporation crystallization tank to avoid the need for turning over during crystallization filtration. It not only avoids the risk of leakage in the filtration process of the existing lithium-containing salt lake brine lithium extraction combination device, but also makes the overall device stable and reliable, thereby solving the problems raised in the above-mentioned background technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall three-dimensional external structure diagram of the utility model;

[0015] Figure 2 This is a three-dimensional enlarged structural diagram of the evaporation crystallization tank in the utility model;

[0016] Figure 3 It is a three-dimensional unfolded structural diagram of the evaporation crystallization tank in the utility model;

[0017] Figure 4 This is a three-dimensional enlarged structural diagram of the main tank body in the utility model;

[0018] Figure 5 It is a three-dimensional enlarged structural diagram of the separation liquid tank in the utility model;

[0019] In the figure: 1. PLC control system box; 2. separation liquid tank; 21. liquid phase cavity; 22. digital display heavy metal ion detection sensor; 23. discharge nozzle with electric valve; 24. support bracket; 3. evaporation crystallization tank; 31. main tank body; 311. outer shell; 312. insulation layer; 313. inner tank with built-in resistance heating component; 314. evaporation tube; 315. brine tube with electric valve; 316. precipitant tube with electric valve; 317. resistance heating component electrical connection terminal; 318. crystallization outlet channel with valve; 319. separation liquid tube with electric valve; 32. separation filter frame; 321. inclined end face; 33. agitator; 34. sealing tank cover; 35. stirring motor; 4. connecting flange; 5. connecting bolts. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant literature, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0022] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0024] See also Figure 1-5 , the utility model provides a technical solution:

[0025] A lithium extraction combined device for lithium-containing salt lake brine comprises a PLC control system box 1, a separation liquid tank 2 and an evaporation crystallization tank 3. The evaporation crystallization tank 3 is arranged on the top of the separation liquid tank 2. Connecting flanges 4 are fixedly installed around the top of the separation liquid tank 2 and around the bottom of the evaporation crystallization tank 3. The connecting flanges 4 are fixedly connected by connecting bolts 5. The evaporation crystallization tank 3 comprises a main tank body 31, a separation filter frame 32, a stirrer 33, a sealed tank cover 34 and a stirring motor 35.

[0026] Specifically, the separation filter frame 32 is fixedly installed inside the main tank body 31 near the bottom end, the agitator 33 is movably installed at the center of the top surface of the separation filter frame 32, the sealed tank cover 34 is fixedly installed on the top surface of the main tank body 31 by bolts, the stirring motor 35 is fixedly installed at the center of the top surface of the sealed tank cover 34 by bolts, and the output shaft of the stirring motor 35 and the agitator 33 are fixedly connected by a coupling; the main tank body 31 includes an outer shell 311, and the inner wall of the outer shell 311 is sequentially provided with a heat insulation layer 312, an inner tank with a built-in resistance heating component, and a heat insulation layer 313. 313, the outer surface of the main tank body 31 is penetrated by an evaporation tube 314, a brine tube 315 with an electric valve and a precipitant tube 316 with an electric valve near the top, the outer surface of the main tank body 31 is fixedly installed with a resistance heating component electrical connection terminal 317, the outer surface of the main tank body 31 is penetrated by a crystallization outlet channel 318 with a valve near the top surface of the separation filter frame 32, and the center of the bottom surface of the main tank body 31 is penetrated by a separation liquid tube 319 with an electric valve; the diameter of the separation liquid tank 2 is slightly larger than the diameter of the evaporation crystallization tank 3, and the separation liquid The height of tank 2 is slightly smaller than that of evaporation crystallization tank 3. A proper amount of brine can be introduced into the main tank body 31 through brine pipe 315 with electric valve, and evaporation begins under the heating of inner tank 313 with built-in resistance heating component. At this time, the evaporated gas phase will be discharged through evaporation pipe 314, and then a proper amount of precipitant can be introduced into the concentrated liquid through precipitant pipe 316 with electric valve. At the same time, stirrer 33 fully mixes and stirs the precipitant and concentrated liquid under the action of stirring motor 35. After the mixing is completed, lithium will be separated in the form of precipitate, and crystallization will be completed. After precipitation, the separation liquid pipe 319 with the electric valve is opened. At this time, the crystals are retained in the separation filter frame 32. At the same time, the liquid phase passes through the separation filter frame 32 and enters the interior of the separation liquid tank 2 through the separation liquid pipe 319 with the electric valve. Then, the crystal derivation channel 318 with the valve can be opened to extract the crystals retained on the top surface of the separation filter frame 32, thereby realizing the evaporation crystallization filtration of the lithium salt, and there is no need to flip during the crystallization filtration, which not only avoids the risk of leakage in the existing lithium-containing salt lake brine lithium extraction combined device during the filtration process, but also the overall device is stable and reliable;

[0027] Preferably, the top surface of the separation filter frame 32 is provided with an inclined end surface 321, and the lowest end of the inclined end surface 321 is located near the crystal outlet channel 318 with a valve, and the inclined end surface 321 can be provided to guide the lithium salt crystals retained on the top surface of the separation filter frame 32 to prevent waste caused by residue;

[0028] Preferably, a liquid phase cavity 21 is provided inside the separation liquid tank 2, a digital heavy metal ion detection sensor 22 is embedded and installed on the outer surface of the separation liquid tank 2, a liquid discharge nozzle 23 with an electric valve is installed through the center of the bottom end of the separation liquid tank 2, and a support stand 24 is fixedly installed around the bottom end of the separation liquid tank 2. The digital heavy metal ion detection sensor 22 can detect heavy metal ions in the separated liquid phase, and then according to the detection data, the liquid discharge nozzle 23 with the electric valve is opened to introduce it into the corresponding liquid phase treatment and purification equipment, which is green and environmentally friendly and prevents heavy metal ions from entering the environment to cause damage and pollution to the human body and the natural environment;

[0029] In summary, the utility model does not need to be flipped during crystallization filtration, which not only avoids the risk of leakage in the filtration process of the existing lithium-containing salt lake brine lithium extraction combined device, but also makes the overall device stable and reliable.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium extraction combined device for lithium-containing salt lake brine, comprising a PLC control system box (1), a separation liquid tank (2) and an evaporation crystallization tank (3), characterized in that: An evaporation crystallization tank (3) is arranged at the top of the separation liquid tank (2), and connecting flanges (4) are fixedly installed around the top of the separation liquid tank (2) and around the bottom of the evaporation crystallization tank (3), and the connecting flanges (4) are fixedly connected by connecting bolts (5). The evaporation crystallization tank (3) comprises a main tank body (31), a separation filter frame (32), a stirrer (33), a sealed tank cover (34) and a stirring motor (35).

2. A lithium extraction combined device for lithium-containing salt lake brine according to claim 1, characterized in that: The separation filter frame (32) is fixedly mounted inside the main tank body (31) near the bottom end, the agitator (33) is movably mounted at the center of the top surface of the separation filter frame (32), the sealed tank cover (34) is fixedly mounted on the top surface of the main tank body (31) by bolts, the stirring motor (35) is fixedly mounted at the center of the top surface of the sealed tank cover (34) by bolts, and the output shaft of the stirring motor (35) and the agitator (33) are fixedly connected by a coupling.

3. A lithium extraction combined device for lithium-containing salt lake brine according to claim 2, characterized in that: The main tank body (31) comprises an outer shell (311), the inner wall of which is provided with a heat insulation layer (312) and an inner tank (313) with a resistance heating component in sequence from the outside to the inside. An evaporation tube (314), a brine tube (315) with an electric valve, and a precipitant tube (316) with an electric valve are installed through the outer surface of the main tank body (31) near the top. An electrical connection terminal (317) of the resistance heating component is fixedly installed on the outer surface of the main tank body (31). A crystallization outlet channel (318) with a valve is installed through the outer surface of the main tank body (31) near the top of the separation filter frame (32). A separation liquid tube (319) with an electric valve is installed through the center of the bottom surface of the main tank body (31).

4. A lithium extraction combined device for lithium-containing salt lake brine according to claim 3, characterized in that: The top surface of the separation filter frame (32) is provided with an inclined end surface (321), and the lowest end of the inclined end surface (321) is located close to a crystallization outlet channel (318) with a valve.

5. A lithium extraction combined device for lithium-containing salt lake brine according to claim 1, characterized in that: The separation liquid tank (2) has a liquid phase cavity (21) formed inside, a digital heavy metal ion detection sensor (22) is embedded in the outer surface of the separation liquid tank (2), a liquid discharge nozzle (23) with an electric valve is installed through the center of the bottom end of the separation liquid tank (2), and support legs (24) are fixedly installed around the bottom end of the separation liquid tank (2).

6. A lithium extraction combined device for lithium-containing salt lake brine according to claim 1, characterized in that: The diameter of the separation liquid tank (2) is slightly larger than the diameter of the evaporation crystallization tank (3), and the height of the separation liquid tank (2) is slightly smaller than the height of the evaporation crystallization tank (3).

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