Movable device for obtaining lithium salt from salt lake brine

Abstract

A movable device for obtaining lithium salt from salt lake brine, comprising: a movable box body (1), and a brine impurity removal device and a lithium precipitation device (76) which are arranged in the movable box body (1), the brine impurity removal device being connected to the lithium precipitation device (76); the brine impurity removal device comprises one or more of an adsorption separation device (71), a membrane device (72), an electrodialysis device (73), a resin deep impurity removal device (74) and an evaporation device (75).

Description

A mobile device for obtaining lithium salt from salt lake brine Technical Field

[0001] The present application belongs to the technical field of high-tech transformation of traditional industries, and relates to a movable test device for obtaining lithium salts such as lithium carbonate, lithium hydroxide, lithium phosphate or lithium chloride from salt lake brine. Background Art

[0002] With the advocacy of low-carbon and environmental protection policies, the continuous implementation of new energy policies, and the rapid development of the new energy industry, lithium battery technology has also become the most popular topic of discussion. The market for lithium battery-related materials is also continuing to be hot. With the continuous breakthroughs and innovations in the technology of salt lake lithium extraction industry, salt lake lithium extraction has become an important supply sector of lithium battery raw materials. The development of the current mainstream process adsorption + membrane coupling technology in the industry is becoming increasingly mature, which is also driving the continuous expansion of the production capacity of the entire industry.

[0003] The entire process production line from salt lake brine lithium extraction technology to lithium carbonate products is huge in scale. Limited by natural conditions and production conditions, in salt lake mining areas with different conditions, the whole-line development test and verification of the salt lake brine lithium carbonate production process technology route is difficult and inefficient. Development and verification work can only be carried out in stages in the laboratory. It is impossible to flexibly and effectively simulate the continuous experimental operation from salt lake lithium to lithium carbonate on site in a short period of time. It takes too long and is complicated to operate, and requires a lot of manpower, financial resources and material resources. Therefore, a highly efficient, easy-to-operate, simple, and portable test device that is not restricted by the natural conditions and production conditions of the experimental area is needed to realize the simulation operation of the entire line. Technical issues

[0004] The purpose of this application is to provide a mobile device for obtaining lithium salt from salt lake brine. The device can be transported to the salt lake site by truck for experimental operation, which greatly shortens the test cycle, overcomes the limitations of laboratory operation, and solves the problems of difficulty and low efficiency in the whole-line development test verification of the salt lake brine production process technology route. Technical Solutions

[0005] This application is implemented through the following technical solutions:

[0006] A movable device for obtaining lithium salt from salt lake brine, comprising: a movable box and a brine impurity removal device and a lithium precipitation device arranged in the movable box, wherein the brine impurity removal device is connected to the lithium precipitation device; the brine impurity removal device comprises one or more of an adsorption separation device, a membrane device, an electrodialysis device, a resin deep impurity removal device and an evaporation device.

[0007] Preferably, the brine impurity removal device includes an adsorption separation device, a membrane device, an electrodialysis device, a resin deep impurity removal device and an evaporation device connected in sequence; the evaporation device is connected to the lithium precipitation device.

[0008] Furthermore, a plurality of movable boxes are provided, and one movable box is provided with one or more of an adsorption separation device, a membrane device, an electrodialysis device, a resin deep impurity removal device, an evaporation device and a lithium precipitation device.

[0009] Furthermore, the adsorption separation device, membrane device, electrodialysis device, resin deep impurity removal device, evaporation device and lithium precipitation device are connected in sequence using quick connectors.

[0010] Preferably, the movable test device includes an acid-base preparation device disposed in the movable box;

[0011] And / or, the movable test device includes a pure water preparation device arranged in the movable box.

[0012] Preferably, base frames are fixedly installed on both sides of the movable box; the brine impurity removal device and the lithium precipitation device are arranged on the base frames.

[0013] Preferably, the movable box is provided with exhaust facilities, and / or the movable box is provided with lighting facilities.

[0014] Preferably, the membrane device comprises a reverse osmosis device and a nanofiltration device connected in sequence.

[0015] Preferably, the reverse osmosis device includes a first membrane support and an RO membrane feed pump, a first membrane tube and an RO membrane discharge storage tank which are arranged on the first membrane support and connected in sequence;

[0016] And / or, the nanofiltration device includes a second membrane support and a NF membrane feed pump, a second membrane tube and a NF membrane discharge storage tank which are arranged on the second membrane support and connected in sequence.

[0017] Preferably, the electrodialysis device comprises a first bracket, and an electrodialysis feed pump, a first membrane stack, and an electrodialysis effluent storage tank which are arranged on the first bracket and connected in sequence;

[0018] And / or, the resin deep impurity removal device includes a second bracket and a resin impurity removal feed pump, a resin column and a resin discharge storage tank which are arranged on the second bracket and connected in sequence;

[0019] And / or, the lithium precipitation device includes a lithium precipitation feed pump, a lithium precipitation reactor, a thickener, a solid-liquid separation component, a washing component and a drying component connected in sequence; and a stirring component is provided in the lithium precipitation reactor. Beneficial effects

[0020] Compared with the prior art, this application has the following beneficial effects:

[0021] The device of this application adopts the form of modular assembly of boxes, which can be placed on trucks and flexibly transported to salt lake areas with harsh natural conditions and production conditions. Under the condition of large-scale pilot test, it can fully realize the process from adsorption + membrane coupling technology to evaporation and lithium precipitation, and finally realize the simulation test of the whole line process of lithium carbonate, lithium hydroxide, lithium chloride and lithium phosphate (hereinafter referred to as lithium salt) that can be carried out in non-laboratory sites. This application solves the problem that the entire production process route of existing lithium salt production is difficult to flexibly simulate on-site in salt lake areas, solves the problems of low efficiency, difficulty and complex operation in the development and research of lithium salt production process routes, greatly shortens the test cycle and the limitations of laboratory operations, and realizes the effective experimental verification of the feasibility of lithium salt production process lines in non-laboratory sites. The operability and efficiency of the development of lithium salt whole line process routes are greatly improved, which can greatly reduce labor costs, time costs and energy consumption of current segmented experiments.

[0022] Furthermore, the assembly and combination of the device are flexible, and the devices can be combined in different boxes according to actual conditions. Through quick connectors, the connection and disassembly requirements of the overall process route can be quickly simulated.

[0023] Furthermore, the device is also provided with a pure water preparation device and / or an acid and alkali preparation device, which can solve the problem of on-site acid and alkali shortage in the salt lake area and further improve the overall efficiency.

[0024] Furthermore, the device can move the base frame fixedly installed on both sides of the box; the brine impurity removal device and the lithium precipitation device are arranged on the base frame, which is convenient for disassembly and assembly.

[0025] Furthermore, the device is equipped with exhaust facilities to circulate air between the interior space of the movable box and the outside world, maintaining a constant temperature and ensuring the safety of operators. Lighting facilities are provided for illumination, meeting 24-hour operation and improving test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic diagram of the overall structure of a test device in a specific embodiment provided in this application.

[0027] FIG2 is a flow chart of the process steps of the lithium salt experiment provided in this application.

[0028] FIG3 is a block diagram of an overall test device in a specific embodiment provided in this application.

[0029] FIG4 is a schematic structural diagram of the adsorption separation device provided in this application.

[0030] FIG5 is a schematic structural diagram of the membrane device provided in this application.

[0031] FIG6 is a schematic structural diagram of the nanofiltration device provided in this application.

[0032] FIG7 is a schematic structural diagram of the electrodialysis device provided in this application.

[0033] FIG8 is a schematic structural diagram of the resin deep impurity removal device provided in this application.

[0034] FIG9 is a schematic structural diagram of the evaporation device provided in this application.

[0035] FIG10 is a schematic structural diagram of the lithium deposition device provided in this application.

[0036] FIG11 is a schematic structural diagram of the pure water preparation device provided in this application.

[0037] FIG12 is a schematic structural diagram of the acid-base preparation device provided in this application. Modes for Carrying Out the Invention

[0038] In order to further understand the present application, the present application is described below in conjunction with embodiments. These descriptions are only to further explain the features and advantages of the present application and are not intended to limit the claims of the present application.

[0039] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intermediate component at the same time. Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as those generally understood by technicians in the technical field of this application. It should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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 a mechanical connection, an electrical connection, or the internal communication of two components.

[0040] It should also be noted that in the description of this application, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] Referring to Figures 1 and 3, the present application provides a movable device for obtaining lithium salt from salt lake brine, comprising: a movable box 1 and a brine impurity removal device and a lithium precipitation device 76 arranged in the movable box 1, the brine impurity removal device is connected to the lithium precipitation device 76; the brine impurity removal device includes one or more of an adsorption separation device 71, a membrane device 72, an electrodialysis device 73, a resin deep impurity removal device 74 and an evaporation device 75.

[0042] In a specific embodiment of the present application, the movable test device includes: a movable housing 1, and an adsorption separation device 71, a membrane device 72, an electrodialysis device 73, a resin deep impurity removal device 74, an evaporation device 75, and a lithium precipitation device 76 connected in sequence; the adsorption separation device 71, the membrane device 72, the electrodialysis device 73, the resin deep impurity removal device 74, the evaporation device 75, and the lithium precipitation device 76 are all arranged in the movable housing. Preferably, several movable housings are provided, and the adsorption separation device 71, the membrane device 72, the electrodialysis device 73, the resin deep impurity removal device 74, the evaporation device 75, and the lithium precipitation device 76 can be combined according to actual conditions and arranged in different movable housings 1. The various devices are connected with hoses, stainless steel pipes, PVC pipes, and other pipes.

[0043] The present application may also selectively include an acid-base preparation device 78 and a pure water preparation device 77 , and the acid-base preparation device 78 and the pure water preparation device 77 are also arranged in the movable box 1 .

[0044] The alkali produced by the acid-base preparation device 78 is sodium hydroxide or lithium hydroxide.

[0045] The movable box 1 is made of a combination of carbon steel plates, stainless steel plates, channel steels, angle steels and other materials, or a finished movable box such as a container is selected. The material for making each surface of the movable box 1 is preferably a steel plate with a thickness of 0.5-5mm, and the thickness is more preferably 1.5mm; the material for making the frame of the movable box 1 is preferably 5-12# channel steel, and more preferably 10# channel steel. The length of the movable box 1 is 0-30m, preferably 5-18m, and more preferably 12m; the width of the movable box is 0-5m, preferably 1-3m, and more preferably 2.55m; the height of the movable box is 0-5m, preferably 1-3m, and more preferably 2.44m.

[0046] A base frame 2 is fixedly installed on both sides of the movable box 1; the base frame 2 is made of carbon steel, stainless steel or steel materials that can bear weight. It is preferably made of carbon steel and stainless steel, and more preferably made of stainless steel profiles. The base frame 2 is made of a stainless steel square tube with a thickness of 1-5mm, and preferably a 3mm stainless steel square tube. The base frame 2 leaves a bottom space 4 of 1-80cm high from the bottom of the movable box, preferably 2-30cm, and more preferably 15cm. The bottom space 4 is the space reserved by the base frame 2, and its function is to be used for laying cables and connecting facilities channels between its units.

[0047] The base frame 2 is fixed to the bottom surface of the movable housing 1 by welding, riveting, or bolting, with welding being preferred. The base frame 2 is used to support and secure the aforementioned devices, such as the adsorption separation device 71, membrane device 72, electrodialysis device 73, resin deep impurity removal device 74, evaporation device 75, lithium precipitation device 76, pure water preparation device 77, acid and alkali preparation device 78, and control system 79, to facilitate overall movement and transportation.

[0048] The base frames 2 on both sides are connected by steel plates 3, which are used to block gaps between the devices and form a safe fire escape. Steel plates 3 are made of carbon steel, stainless steel, or galvanized steel. Carbon steel and stainless steel are preferred, with stainless steel being even more preferred. Steel plates 3 are made of 1-4 mm thick steel, preferably 3 mm stainless steel pipe. They are laid on the base frames 2 to serve as a passage or fire escape.

[0049] The movable housing 1 is provided with an exhaust facility 5, which is an axial flow fan, an air conditioner, or an exhaust fan, preferably an air conditioner and an exhaust fan, and more preferably an exhaust fan. The exhaust facility 5 is used to circulate air between the interior of the movable housing 1 and the outside world, maintain a constant temperature, protect electrical equipment, and ensure the safety of operators.

[0050] The movable box 1 is provided with a lighting facility 6, which is an LED, an incandescent lamp or a searchlight, and is installed on the ceiling facility on the top of the movable box 1. LED lamps and incandescent lamps are preferred, and LED lamps are further preferred. The lighting facility 6 is used for lighting and can be operated 24 hours a day.

[0051] The adsorption separation device 71, membrane device 72, electrodialysis device 73, resin deep impurity removal device 74, evaporation device 75, lithium precipitation device 76, pure water preparation device 77 and its control system 78 constitute the main process equipment 7 of this application.

[0052] Referring to Figure 4, the adsorption separation device 71 includes a main unit 711 and a qualified liquid storage tank 712. The main unit 711 includes a frame 7111, a first drive component 7112, a feed pump 7113, a rotating component 7114 and a control component 7115. The frame 7111 is made of steel materials such as carbon steel, stainless steel or materials that can bear weight, preferably made of carbon steel and stainless steel, and more preferably made of stainless steel profiles. The frame 7111 is made of a stainless steel square tube with a length and width of 1cm-16cm and a thickness of 1-5mm, and more preferably made of a stainless steel square tube with a length and width of 5cm and a thickness of 3mm. The frame 7111 is 1.2-2.5m high, 1-2m long and 1-1.5m wide; preferably 1.8m high, 1.5m long and 0.75m wide.

[0053] The first drive component 7112 is selected from a servo motor, a DC motor, or an AC motor, preferably a servo motor. The pump 7113 is selected from a metering pump or a peristaltic pump, preferably a peristaltic pump. The rotating component 7114 is constructed from one or a combination of materials such as PVC, UPVC, polytetrafluoroethylene, or PVDF, preferably a combination of UPVC and polytetrafluoroethylene. The control component 7115 is an electrical and control element.

[0054] The frame 7111 holds the first drive component 7112, feed pump 7113, rotating component 7114, and its control component 7115. The first drive component 7112 converts electrical energy into kinetic energy, driving the rotating components 7114, which are arranged and assembled in a certain pattern, to achieve lithium adsorption, washing, and desorption. The feed pump 7113 delivers raw brine to the rotating components 7114. The rotating components 7114 contain selective lithium adsorbent material and are arranged and assembled in a certain pattern. Driven by the drive components, they achieve lithium adsorption, washing, and regeneration from the raw material. Leveraging the selectivity of the lithium adsorbent material, they separate lithium from other impurities from the raw material. The control component 7115 uses electrical components to enable the rotating components to control the operation of the drive components according to specified requirements. This section utilizes existing technology and will not be discussed in detail.

[0055] The qualified liquid storage tank 712 is made of PE, PVC, fiberglass, and steel, preferably PE, PVC, and fiberglass, and more preferably PE. There are 1 to 8 qualified liquid storage tanks 712, more preferably 2 to 6, and even more preferably 3. The qualified liquid storage tank 712 is designed to have a diameter of 0 to 1.5 m, more preferably 0.1 to 0.8 m, and even more preferably 0.58 m. The qualified liquid storage tank 712 is designed with a heating device, a stirring device, and a liquid level monitoring device. The function of the qualified liquid storage tank 712 is to store qualified liquid.

[0056] The main function of the adsorption separation device 71 is to bring the lithium-containing solution into contact with the lithium adsorbent loaded in the rotating equipment (preferably the adsorbent produced by Patent No.: ZL 202011080243.2). Through the selectivity of the adsorbent for lithium, the lithium in the lithium-containing raw material is adsorbed onto the adsorbent, and then a qualified lithium-containing liquid with a low impurity content is obtained through analysis, which is sent to the membrane device 72 through a pipeline or conveying equipment for further processing.

[0057] The adsorption separation device 71 has an adsorbent loading capacity of 0-5000L, preferably 5-50L, and further preferably 9-12L; the operation steps are divided into three steps, namely adsorption, washing and dewashing, and is suitable for brine with different lithium characteristics, wherein the lithium content is 30-8000ppm, the boron content is 0.01-7000ppm, the potassium content is 0.01-30000ppm, the magnesium content is 0.01-120000ppm, the calcium content is 0.01-40000ppm, the sodium content is 0.01-150000ppm, and the sulfate radical is 0.01-65000ppm. The adsorption flow rate is controlled at 0-7BV, preferably 4BV; the washing flow rate is controlled at 1-10BV, preferably 8BV, and the desorption flow rate is controlled at 0-6BV, preferably 5BV.

[0058] The product liquid (desorbed liquid) obtained by the adsorption separation device 71 has the following contents: lithium content 80-1500 ppm, potassium 5-150 ppm, sodium content 0.01-800 ppm, calcium content 0.01-300 ppm, magnesium content 0.01-2300 ppm, boron content 0.01-1400 ppm, and sulfate content 0.01-150 ppm.

[0059] The operating temperature of the adsorption separation device 71 is 0-60°C.

[0060] 3 and 5 , the membrane device 72 comprises a reverse osmosis device 721 and a nanofiltration device 722. The reverse osmosis device 721 includes a first membrane support 7212, and a RO membrane feed pump 7213, a first membrane tube 7211, and an RO membrane discharge storage tank 7215, which are disposed on the first membrane support 7212 and sequentially connected thereto, and further includes a first control valve 7214.

[0061] The first membrane tube 7211 is made of fiberglass, stainless steel, or ceramic, preferably fiberglass and stainless steel, and even more preferably fiberglass. The first membrane tube 7211 serves as a membrane for separating salt and water from the qualified liquid. The size of the first membrane tube 7211 ranges from 1 cm to 30 cm, preferably from 5 cm to 20 cm, and even more preferably from 10 cm.

[0062] The first membrane support 7212 is made of a square tube material such as carbon steel, stainless steel, or a material capable of bearing weight. Carbon steel and stainless steel square tubes are preferred, and stainless steel square tubes are more preferred. The first membrane support 7212 is made of a stainless steel square tube with a specification of 0-10 cm, further preferably a 2-8 cm square tube, and further preferably a 5 cm square tube. The manufacturing specifications of the first membrane support 7212 are: length: 0-3 m; width: 0-1.5 m; height: 0-5 m; further specifications are: length: 1-2.5 m; width: 0.7-1.2 m; height: 1-2.5 m; further specifications are: length: 2 m; width: 1 m; height: 1.3 m.

[0063] The main function of the first membrane support 7212 is to support the first membrane tube 7211 , the RO membrane feed pump 7213 , the first control valve 7214 and the RO membrane discharge storage tank 7215 , and is fixed on the base frame 2 at the bottom of the movable box 1 .

[0064] The RO membrane feed pump 7213 can be a centrifugal pump, a plunger pump, or a diaphragm pump, preferably a centrifugal pump or a diaphragm pump, and more preferably a centrifugal pump. The RO membrane feed pump 7213 is made of carbon steel, duplex stainless steel, or non-metallic materials, preferably duplex stainless steel and non-metallic materials, and more preferably duplex stainless steel. The RO membrane feed pump 7213 is primarily used to transport qualified liquid and increase pressure.

[0065] The first control valve 7214 is made of carbon steel, duplex stainless steel, UPVC, CPVC, or PVC, and is further made of duplex stainless steel, UPVC, CPVC, or PVC, and is further made of PVC. The function of the first control valve 7214 is to control the opening and closing of the control valve through the control system, thereby controlling the flow of materials.

[0066] The RO membrane discharge storage tank 7215 is made of PE, PVC, fiberglass, and steel. PE, PVC, and fiberglass are preferred, with PE being even more preferred. One to five RO membrane discharge storage tanks 7215 are designed, with one to three being even more preferred, and two being even more preferred. The RO membrane discharge storage tank 7215 is designed to have a diameter of 0 to 1.5 m, with a diameter of 0.1 to 0.8 m being even more preferred, and 0.6 m being even more preferred. The RO membrane discharge storage tank 7215 is used to store concentrated brine after reverse osmosis treatment.

[0067] The function of the reverse osmosis device 721 is to use a special membrane to transport qualified liquid into the membrane through the combination of the RO membrane feed pump 7213 and the first control valve 7214 to achieve the separation of salt and water. The brine is stored in the fresh water tank, and the high-salt content is stored in the RO membrane discharge tank 7215 for further processing.

[0068] The feed composition of the reverse osmosis device 721 is: lithium content 80-1500 ppm, potassium content 5-150 ppm, sodium content 0.01-800 ppm, calcium content 0.01-300 ppm, magnesium content 0.01-2300 ppm, boron content 0.01-1400 ppm, and sulfate content 0.01-150 ppm. The feed flow rate is 0.01-2000 L / h. The brine (product water) flow rate is 0.01-1000 L / h, and the composition is: lithium content 0.01-30 ppm, potassium content 5-10 ppm, sodium content 0.01-30 ppm, and boron content 0.01-300 ppm. The brine volume is 0.01-1000 L / h, and the components are: lithium content 800-2000 ppm, potassium content 20-600 ppm, sodium content 0.05-3200 ppm, boron content 0.01-300 ppm, calcium component content 0.05-1000 ppm, and magnesium component content 0.01-3500 ppm.

[0069] 6 , the nanofiltration device 722 includes a second membrane support 7222 and a NF membrane feed pump 7223 , a second membrane tube 7221 and a NF membrane discharge storage tank 7225 disposed on the second membrane support 7222 and connected in sequence, and also includes a second control valve 7224 .

[0070] The second membrane tube 7221 is made of fiberglass, stainless steel, or ceramic, preferably fiberglass and stainless steel, and even more preferably fiberglass. The second membrane tube 7221 serves as a membrane for removing dipotassium ions, such as calcium, magnesium, and sulfate, from the concentrated brine produced by the reverse osmosis unit 721. The second membrane tube 7221 is manufactured in a size of 1 cm to 30 cm, preferably 5 cm to 20 cm, and even more preferably 10 cm.

[0071] The second membrane support 7222 is made of square tube materials such as carbon steel, stainless steel, or a material capable of bearing weight. Carbon steel and stainless steel square tubes are preferred, and stainless steel square tubes are more preferred. The second membrane support 7222 is made of stainless steel square tubes with a specification of 0-10 cm, further preferably 2-8 cm square tubes, and further preferably 5 cm square tubes. The second membrane support 7222 has a manufacturing specification of length: 0-3 m; width: 0-1.5 m; height: 0-5 m; further specifications are length: 1-2.5 m; width: 0.7-1.2 m; height: 1-2.5 m; further specifications are length: 2 m; width: 1 m; height: 1.3 m. The second membrane support 7222 is mainly used to support the second membrane tube 7211, the second membrane support 7222, the NF membrane feed pump 7223, the second control valve 7224 and the NF membrane discharge storage tank 7225 and other equipment, and is fixed on the bottom frame 2 at the bottom of the movable box 1.

[0072] The NF membrane feed pump 7223 is a centrifugal pump, a plunger pump, or a diaphragm pump, preferably a centrifugal pump or a diaphragm pump, and more preferably a centrifugal pump. The NF membrane feed pump 7223 is made of carbon steel, duplex stainless steel, or non-metallic materials, preferably duplex stainless steel and non-metallic materials, and more preferably duplex stainless steel. The NF membrane feed pump 7223 primarily pumps liquid from the RO membrane discharge tank 7215 into the nanofiltration device 722.

[0073] The second control valve 7224 is made of carbon steel, duplex stainless steel, UPVC, CPVC, or PVC, and is further made of duplex stainless steel, UPVC, CPVC, or PVC. The function of the second control valve 7224 is to control the opening and closing of the control valve through the control system, thereby realizing the on / off and flow direction of the material.

[0074] NF membrane discharge storage tank 7225 is made of PE, PVC, fiberglass, and steel. PE, PVC, and fiberglass are preferred, with PE being even more preferred. The NF membrane discharge storage tank 7225 is designed to have 1-5 tanks, more preferably 1-3 tanks, and even more preferably 2 tanks. The NF membrane discharge storage tank 7225 has a designed diameter of 0-1.5 m, more preferably 0.1-0.8 m, and even more preferably 0.6 m. The NF membrane discharge storage tank 7225 is used to store nanofiltered brine.

[0075] The function of the nanofiltration device 722 is to use a special membrane to transport the liquid in the RO membrane discharge tank 7215 into the membrane through the combination of the NF membrane feed pump 7223 and the second control valve 7224, so as to achieve the separation of monovalent ions and dipotassium ions (calcium, magnesium and sulfate). The brine is stored in the NF membrane discharge tank for further processing, and the concentrated brine containing calcium, magnesium, etc. is stored in the concentrated brine tank and transported to the adsorption separation device for adsorption and lithium recovery.

[0076] The brine feed volume of the nanofiltration device 722 is 0.01-1000 L / h, and the components are: lithium content 800-2000 ppm, potassium content 20-600 ppm, sodium content 0.05-3200 ppm, boron content 0.01-300 ppm, calcium component content 0.05-1000 ppm, and magnesium component content 0.01-3500 ppm.

[0077] The nanofiltration device 722 produces water with a flow rate (salt water) of 0.01-1000 L, and its components are: lithium content 800-2000 ppm, potassium content 20-600 ppm, sodium content 0.05-3800 ppm, boron content 0.01-300 ppm, calcium component content 0.05-20 ppm, and magnesium component content 0.01-20 ppm.

[0078] The concentrated water flow rate of the nanofiltration device 722 is 0.01-700L, and the components are: lithium content 50-200ppm, potassium content 10-20ppm, sodium content 0.05-150ppm, boron content 0.01-200ppm, calcium component content 0.05-6000ppm, and magnesium component content 0.01-5400ppm.

[0079] 7 , the electrodialysis device 73 includes a first bracket 732 and an electrodialysis feed pump 734 , a first membrane stack 731 and an electrodialysis effluent storage tank 735 , which are arranged on the first bracket 732 and connected in sequence. The electrodialysis device 73 may also include a first DC power supply 733 .

[0080] The first membrane stack 731 is composed of a cathode membrane, an anode membrane, and electrodes. The main function of the first membrane stack 731 is to separate salt and water by allowing anions and cations to migrate to the cathode and anode compartments under the action of an electric field, thereby concentrating the desalinated water.

[0081] The first bracket 732 is made of square tube materials such as carbon steel, stainless steel or materials that can bear weight. It is preferably made of carbon steel and stainless steel square tube materials, and further preferably made of stainless steel square tubes. The first bracket 732 is made of stainless steel square tubes with a specification of 0-15cm, further selected from 2-8cm square tubes, and further selected from 5cm square tubes. The manufacturing specifications of the first bracket 732 are length: 0-3m; width: 0-1.5m; height: 0-5m; further manufacturing specifications are length: 1-2.5m; width: 0.7-1.2m; height: 1-2.5m; further manufacturing specifications are length: 1.5m; width: 1m; height: 1.4m. The main function of the first bracket 732 is to support the first membrane stack 731, the DC power supply 733, the electrodialysis feed pump 734, and the electrodialysis discharge storage tank 735.

[0082] The first DC power supply 733 is a lithium battery, a lead-acid battery, a sodium battery, or a solid-state battery, preferably a lithium battery or a lead-acid battery, and more preferably a lithium battery. The main function of the first DC power supply 733 is to provide a continuous DC power supply to the electrodes of the first membrane stack 731.

[0083] The electrodialysis feed pump 734 is a centrifugal pump, a plunger pump, or a diaphragm pump, preferably a centrifugal pump or a diaphragm pump, and more preferably a centrifugal pump. The electrodialysis feed pump 734 is made of carbon steel with a rubber lining, duplex stainless steel, or non-metallic materials, preferably duplex stainless steel and non-metallic materials, and more preferably duplex stainless steel. The electrodialysis feed pump 734 primarily transports the salt water produced in the previous step to the chamber of the first membrane stack 731, thereby separating the salt and water.

[0084] The electroosmosis effluent storage tank 735 is made of PE, PVC, fiberglass, organic glass and steel. It is preferably made of PE, PVC, organic glass and fiberglass, and more preferably organic glass. The design of the electroosmosis effluent storage tank 735 is 1-8, more preferably 2-5, and more preferably 4. The electroosmosis effluent storage tank 735 is designed as a rectangular parallelepiped with a length of 0-50 cm and a width of 0-30 cm, more preferably a rectangular parallelepiped with a length of 20-40 cm and a width of 5-20 cm; more preferably a rectangular parallelepiped with a length of 30 cm and a width of 15 cm. The function of the electroosmosis effluent storage tank 735 is to store concentrated brine.

[0085] The main function of the electrodialysis device 73 is to deliver the brine into the chamber of the electrodialysis device 75 through the electrodialysis feed pump. Under the action of the DC electric field, cations migrate to the cathode and anions migrate to the anode, thereby realizing the concentration of the brine. The brine is continuously circulated and the salinity is continuously reduced.

[0086] The flow rate (brine water) of the electrodialysis device 73 is 0.01-1000 L, and the components are: lithium content 800-2000 ppm, potassium content 20-600 ppm, sodium content 0.05-3800 ppm, boron content 0.01-300 ppm, calcium component content 0.001-1 ppm, and magnesium component content 0.001-1 ppm.

[0087] The flow rate (salt water) of the electrodialysis device 73 is 0.01-600 L, and the components are: lithium content 0.01-200 ppm, potassium content 20-90 ppm, sodium content 0.05-10000 ppm, boron content 0.001-90 ppm, calcium component content 0.001-1 ppm, and magnesium component content 0.001-1 ppm.

[0088] The flow rate (concentrated brine) of the electrodialysis device 73 is 0.01-400L, and the components are: lithium content 15000-18000ppm, potassium content 140-4200ppm, sodium content 0.5-12000ppm, boron content 0.001-80ppm, calcium component content 0.001-1ppm, and magnesium component content 0.001-1ppm.

[0089] 8 , the resin deep impurity removal device 74 includes a second bracket 742 , a resin impurity removal feed pump 743 , a resin column 741 , and a resin discharge storage tank 744 , which are disposed on the second bracket 742 and connected in sequence, and also includes a meter 745 .

[0090] The resin column 741 is made of PVC, UPVC, or CPVC, preferably PVC. The dimensions of the resin column 741 are 0.1-1.5m in diameter and 0.5-3m in height, preferably 0.2-1m in diameter and 1-2m in height, and even more preferably 0.5m in diameter and 1.8m in height. The resin column 741 primarily serves as a resin container, where calcium, magnesium, and boron ions are adsorbed and desorbed, removing calcium and magnesium from the lithium-containing concentrate to achieve the desired concentrations of calcium, magnesium, and boron.

[0091] The second bracket 742 is made of square tube materials such as carbon steel, stainless steel or materials that can bear weight. It is preferably made of carbon steel and stainless steel square tube materials, and further preferably made of stainless steel square tubes. The second bracket 742 is made of stainless steel square tubes with a specification of 0-15cm, further selected to be made of 2-8cm square tubes, and further selected to be made of 5cm square tubes. The manufacturing specifications of the second bracket 742 are length: 0-3m; width: 1-2m; height: 0-5m; further manufacturing specifications are length: 1-2.5m; width: 0.7-1.2m; height: 1-2.5m; further manufacturing specifications are length: 2m; width: 1m; height: 1.8m. The main function of the second bracket 742 is to support components such as the resin column 741, the second bracket 742, the resin impurity removal feed pump 743, the resin discharge storage tank 744, and the instrument 745.

[0092] The resin impurity removal feed pump 743 is a centrifugal pump, a plunger pump, or a diaphragm pump, preferably a centrifugal pump or a diaphragm pump, and more preferably a centrifugal pump. The resin impurity removal feed pump 743 is made of carbon steel, duplex stainless steel, or non-metallic materials, preferably duplex stainless steel and non-metallic materials, and more preferably duplex stainless steel. The resin impurity removal feed pump 743 is primarily used to transport concentrated brine, analytical solution, regeneration solution, and pure water.

[0093] The resin discharge storage tank 744 is partially made of PE, PVC, fiberglass, organic glass and steel materials. It is preferably made of PE, PVC, organic glass and fiberglass materials, and is further preferably made of organic glass. The number of resin discharge storage tanks 744 is 1-8, and is further preferably 2-5, and is further preferably 2. The resin discharge storage tank 744 is designed to be a cylinder with a diameter of 0-50cm and a height of 0.1-2.5m, and is further preferably a cylinder with a diameter of 10-30cm and a height of 0.1-1.5m; and is further preferably a cylinder with a diameter of 30cm and a width of 1.2cm. The main function of the resin discharge storage tank 744 is to store the concentrated liquid for removing calcium, magnesium and boron.

[0094] The main function of the resin deep impurity removal device 74 is to remove calcium, magnesium and boron from the lithium-containing concentrated solution so that the lithium-containing concentrated solution meets the impurity content index requirements of the lithium carbonate product.

[0095] The inlet flow rate of the resin deep impurity removal device 74 is 0.01-1000L, and the components are: lithium content 800-2000ppm, potassium content 20-600ppm, sodium content 0.05-3800ppm, boron content 0.01-300ppm, calcium component content 0.05-20ppm, and magnesium component content 0.01-20ppm.

[0096] The outlet flow rate of the resin deep impurity removal device 74 is 0.01-1000L, and the components are: lithium content 800-2000ppm, potassium content 20-600ppm, sodium content 0.05-3800ppm, boron content 0.01-20ppm, calcium component content 0.001-1ppm, and magnesium component content 0.001-1ppm.

[0097] 9 , the evaporation device 75 includes an evaporation container 751 , a cooling component 752 , a heating component 753 , a second driving component 754 , an evaporation discharge storage tank 755 , and an evaporation feed pump 756 .

[0098] The evaporation vessel 751 is made of organic glass or transparent PVC, preferably organic glass. The diameter of the evaporation vessel 751 is 0-50 cm, preferably 30 cm. The evaporation vessel 751 is mainly used to contain the lithium solution and uniformly heat it.

[0099] The cooling member 752 is made of organic glass or transparent PVC, preferably organic glass. The cooling member 752 is made into a cylindrical coil with a diameter of 0-30 cm, preferably 20 cm.

[0100] The cooling component 752 is mainly used to cool and evaporate the water in the lithium-containing solution to ensure the pressure in the cooling component 752.

[0101] The heating element 753 is made of carbon steel or stainless steel, preferably stainless steel, and is designed with a coil heating device. The diameter of the heating element 753 is 0-80 cm, preferably 60 cm. The heating element 753 is mainly used to heat the evaporation container 751.

[0102] The second driving component 754 is driven by a motor. The second driving component 754 mainly drives the rotating component 753 to rotate, so that the lithium-containing solution in the rotating component 753 is heated evenly.

[0103] The evaporation feed pump 756 is used to pump the lithium-containing solution from the resin discharge storage tank into the evaporation container 751 .

[0104] The main function of the evaporation device 75 is to concentrate the lithium-containing solution so that the lithium in the solution can reach the concentration required for lithium precipitation.

[0105] 10 , the lithium precipitation device 76 includes a lithium precipitation feed pump 761 , a lithium precipitation reactor 762 , a thickener 764 , a solid-liquid separation component 765 , a washing component 766 and a drying component 767 , which are connected in sequence; a stirring component 763 is provided in the lithium precipitation reactor 762 .

[0106] The lithium precipitation reactor 762 is made of organic glass with a diameter of 60 cm and a height of 90 cm. It is mainly used to contain the lithium carbonate generation reaction and to receive the heat generated by the heating component.

[0107] Stirring member 763 is made of carbon steel, stainless steel, or non-metallic materials (such as polytetrafluoroethylene, CPVC, or PVC), preferably polytetrafluoroethylene. Stirring member 763 utilizes a paddle-type agitator with a diameter of 40 cm and a height of 80 cm. Stirring member 763 ensures a sufficient reaction of the lithium carbonate, resulting in a relatively large particle size.

[0108] The solid-liquid separation unit 765 is made of carbon steel, duplex stainless steel, or non-metal, preferably duplex stainless steel. It utilizes a plate centrifuge with a diameter of 50 cm and a height of 40 cm. The function of the solid-liquid separation unit 765 is to separate the solid and liquid components of the reacted lithium carbonate suspension to obtain the lithium carbonate product.

[0109] The function of the lithium precipitation device 76 is to feed the lithium-rich brine into the lithium precipitation reactor, maintain a certain reaction temperature, gradually add sodium carbonate / sodium phosphate to react, generate lithium carbonate products, and obtain lithium salt products such as lithium carbonate or lithium phosphate that meet the requirements through centrifugal separation.

[0110] The lithium precipitation device 76 preferably prepares lithium carbonate, and the reaction mechanism is:

[0111]

[0112] 11 , the pure water preparation device 77 is composed of a third membrane tube 771 , a third membrane support 772 , a first pump 773 , a third control valve 774 and a first water tank 775 .

[0113] The third membrane tube 771 is made of fiberglass, stainless steel, or ceramic, preferably fiberglass and stainless steel, and even more preferably fiberglass. The third membrane tube 771 serves as a membrane for preparing pure water. The third membrane tube 771 is manufactured in a size of 1 cm to 30 cm, preferably 5 cm to 20 cm, and even more preferably 10 cm.

[0114] The third membrane support 772 is made of square tube materials such as carbon steel, stainless steel, or a material that can bear weight. Carbon steel and stainless steel square tubes are preferred, and stainless steel square tubes are more preferred. The third membrane support 772 is made of stainless steel square tubes with a specification of 0-10 cm, further selected from 2-8 cm square tubes, and further selected from 5 cm square tubes. The specifications of the third membrane support 772 are length: 0-3 m; width: 0-1.5 m; height: 0-5 m; further specifications are length: 1-2.5 m; width: 0.7-1.2 m; height: 1-2.5 m; further specifications are length: 2 m; width: 1 m; height: 1.3 m.

[0115] The third membrane support 772 is mainly used to support the third membrane tube 771, the first pump 773, the third control valve 774 and the first water tank 775 and other equipment, and is fixed on the base frame 2 at the bottom of the movable box 1.

[0116] The first pump 773 is a centrifugal pump, a plunger pump, or a diaphragm pump, preferably a centrifugal pump or a diaphragm pump, and more preferably a centrifugal pump. The first pump 773 is made of carbon steel, duplex stainless steel, or non-metallic materials, preferably duplex stainless steel and non-metallic materials, and more preferably duplex stainless steel. The first pump 773 primarily transports water and increases its pressure.

[0117] The third control valve 774 is made of carbon steel, duplex stainless steel, UPVC, CPVC, or PVC, and is further made of duplex stainless steel, UPVC, CPVC, or PVC, and is further made of PVC. The function of the control valve 774 is to control the opening and closing of the control valve through the control system, thereby controlling the flow of materials.

[0118] The first water tank 775 is made of PE, PVC, fiberglass, and steel. PE, PVC, and fiberglass are preferred, with PE being even more preferred. One to five first water tanks 775 are designed, with one to three being even more preferred, and two being even more preferred. The first water tank 775 is designed to have a diameter of 0 to 1.5 m, with a diameter of 0.1 to 0.8 m being even more preferred, and with a diameter of 0.6 m being even more preferred. The third water tank 775 is used to store tap water and purified water.

[0119] The function of the pure water preparation device 771 is to use a seawater desalination membrane to transport tap water into the membrane through the combination of the first pump 773 and the third control valve 774 to achieve the preparation of pure water. The pure water is stored in a fresh water tank for use in the entire process of extracting lithium carbonate, and water with high hardness is directly discharged.

[0120] 12 , the acid-base preparation device 78 is composed of a second membrane stack 781 , a third bracket 782 , a second DC power supply 783 , a second pump 784 , and a second water tank 785 .

[0121] The second membrane stack 781 consists of a cathode membrane, a bipolar membrane, an anode membrane, and electrodes. The primary function of the second membrane stack 781 is to ionize pure water on the bipolar membrane under the action of an electric field, forming hydrogen ions and hydroxide ions. The anions and cations migrate to the cathode and anode compartments, forming acids and bases, thereby achieving the acid-base preparation process.

[0122] The third bracket 782 is made of square tube materials such as carbon steel, stainless steel or materials that can bear weight. It is preferably made of carbon steel and stainless steel square tube materials, and further preferably made of stainless steel square tubes. The third bracket 782 is made of stainless steel square tubes with a specification of 0-15cm, further selected to be made of 2-8cm square tubes, and further selected to be made of 5cm square tubes. The manufacturing specifications of the third bracket 782 part are length: 0-3m; width: 0-1.5m; height: 0-5m; further manufacturing specifications are length: 1-2.5m; width: 0.7-1.2m; height: 1-2.5m; further manufacturing specifications are length: 1.5m; width: 1m; height: 1.4m.

[0123] The third bracket 782 is used to support components such as the second membrane stack 731, the second DC power supply 733, the second pump 734, and the second water tank 785.

[0124] The second DC power supply 783 is a lithium battery, a lead-acid battery, a sodium battery, or a solid-state battery, preferably a lithium battery or a lead-acid battery, and more preferably a lithium battery. The main function of the second DC power supply 783 is to provide a continuous DC power supply to the electrodes of the second membrane stack 781.

[0125] Second pump 784 is a centrifugal pump, a plunger pump, or a diaphragm pump, preferably a centrifugal pump or a diaphragm pump, and more preferably a centrifugal pump. Second pump 784 is made of carbon steel, duplex stainless steel, or non-metallic materials, preferably duplex stainless steel and non-metallic materials, and more preferably duplex stainless steel. Second pump 784 primarily transports concentrated brine to the electrodialysis chamber, thereby separating salt and water.

[0126] The second water tank 785 is made of PE, PVC, fiberglass, organic glass, and steel. PE, PVC, organic glass, and fiberglass are preferred, with organic glass being even more preferred. One to eight second water tanks 785 are designed, with two to five being even more preferred, and four being even more preferred. The second water tank 785 is designed to be a rectangular parallelepiped with a length of 0-50 cm and a width of 0-30 cm, preferably a length of 20-40 cm and a width of 5-20 cm; and even more preferably a length of 30 cm and a width of 15 cm. The second water tank 785 is used to store brine, concentrated brine, and the cathode and anode liquids.

[0127] The main function of the acid-base preparation device 78 is to deliver concentrated brine and pure water into the chamber of the acid-base preparation device 78 through a pump. Under the action of the DC electric field, the water is ionized, and the cations migrate to the cathode and the anions migrate to the anode, thereby realizing the acid-base preparation process, specifically preparing hydrochloric acid and sodium hydroxide for resin regeneration.

[0128] The control system 79 consists of an electrical control system 791 and an automatic control system 792. The electrical control system 791 primarily uses electrical components to power and control the moving equipment. The automatic control system 792 primarily uses a programmable logic controller (PLC) to control pump start and stop, temperature, pressure, and the start and stop of its control valves. The control process of the control system 79 utilizes existing technology and is not modified in this application.

[0129] Referring to Figure 2, the present invention discloses a process for obtaining lithium salt from salt lake brine as follows: the salt lake brine is subjected to adsorption separation using an adsorption separation device 71. The lithium is adsorbed onto the adsorbent through the adsorbent's selective properties for lithium. Through washing and analysis, a qualified lithium-containing solution with low impurity content is obtained. The qualified lithium-containing solution enters a membrane device 72 for concentration and purification to obtain a membrane output solution. The membrane output solution then enters an electrodialysis device 73 for separation, purification, and concentration to obtain an electrodialysis output solution. The electrodialysis output solution enters a resin deep impurity removal device 74, where calcium, magnesium, and boron are removed by resin adsorption, reducing the calcium and magnesium content in the solution to less than 10 ppm and the boron content to less than 20 ppm, thereby obtaining a resin output solution. The resin output solution enters an evaporation device 75 for evaporation and concentration to obtain a concentrated solution. The concentrated solution enters a lithium precipitation device 76 for lithium precipitation reaction to obtain lithium salt. The entire process is fully automatically controlled and recorded to ensure the accuracy and integrity of the test results.

[0130] Specifically:

[0131] 1) The raw salt lake brine is sent to the adsorption separation device 71 via the feed pump 7113 for adsorption separation. The desorption water temperature is controlled at 35°C. After adsorption separation, the qualified liquid is produced and sent to the qualified liquid storage tank 712. It is then sent to the reverse osmosis device 721 by the RO membrane feed pump 7213.

[0132] 2) The qualified liquid is concentrated and purified in reverse osmosis unit 721, and the resulting concentrated liquid is then sent to nanofiltration unit 722 for separation and purification. The qualified liquid is first transported by RO membrane feed pump 7213 to reverse osmosis unit 721 for treatment. After treatment through the RO membrane, the product water effluent is recycled, while the concentrate effluent enters RO membrane discharge tank 7215. It is then transported by NF membrane feed pump 7223 to nanofiltration unit 722 for treatment. The fresh water effluent after nanofiltration membrane treatment is then sent to NF membrane discharge tank 7225 and then to electrodialysis unit 73. Electrodialysis feed pump 734 transports the treated liquid to first membrane stack 731 for further separation, purification, and concentration. The product liquid after treatment in first membrane stack 731 is then transported to electrodialysis discharge tank 735. After further concentration through electrodialysis, the lithium-rich solution can reach approximately 15-18 g / L. The resin impurity removal feed pump 743 then pumps the solution to the resin deep impurity removal unit 74 for fine removal of calcium, magnesium, and boron. The output then enters the resin discharge tank 744, where calcium and magnesium in the lithium-rich solution are reduced to less than 10 ppm, and the boron content is reduced to less than 20 ppm. After continuous treatment in the electrodialysis unit 73 and the resin deep impurity removal unit 74, the lithium-rich solution can reach a lithium concentration of 17-20 g / L.

[0133] 3) The output liquid is first transported from the resin discharge storage tank 744 to the evaporation feed pump 756 for further processing. The evaporation device 75 is set to be heated to 100°C. After evaporation, separation and purification, the lithium concentration of the output liquid can be increased, and the impurity content in the output lithium-rich solution is greatly reduced. The lithium-rich solution is transported to the evaporation discharge storage tank 755. The lithium concentration of the concentrated solution can reach 20-25g / L, so that the lithium precipitation reaction can be carried out.

[0134] 4) The lithium-rich solution after evaporation and purification is then sent to the lithium precipitation device 76, and transported to the lithium precipitation reactor 762 by the lithium precipitation feed pump 761. Sodium carbonate is then added and heated to about 80°C. After stirring and reaction, the crystallized slurry is added to the thickener 764 for further thickening treatment, and then separated by the solid-liquid separation component 765 to obtain a filter cake. The filter cake is further washed by the washing component 766 to remove impurities, and then dried by the drying component 767 to obtain lithium carbonate. The main content of lithium carbonate in the product can reach 88-99.5%.

[0135] This application utilizes a modular assembly structure, enabling flexible assembly and disassembly of multiple devices based on test objectives, material properties, and inspection requirements. Water, electricity, and other materials are connected to the removable box through quick-connect connectors located on the removable box. Each device interface utilizes quick connectors, enabling rapid on-site assembly and disassembly, meeting the requirements of pilot-scale testing and significantly shortening the test cycle.

[0136] In summary, the present application provides a mobile device for obtaining lithium salt from salt lake brine. It is simple to operate, has a flexible experimental site, requires little experimental personnel, and can simulate the entire experimental process of adsorption + membrane coupling to lithium precipitation reaction, greatly improving the experimental efficiency. After modular assembly, the entire set of experimental equipment can be flexibly transported to the salt lake site for simulation experiments, realizing the simulation of the entire production process line from salt lake brine to lithium carbonate, which greatly improves the efficiency of resource development, realizes the efficient comprehensive utilization of resources, and produces good economic benefits.

Claims

1. A mobile device for obtaining lithium salt from salt lake brine, It is characterized in that include: A movable housing (1) and a brine impurity removal device and a lithium precipitation device (76) arranged in the movable housing (1), wherein the brine impurity removal device is connected to the lithium precipitation device (76); the brine impurity removal device comprises one or more of an adsorption separation device (71), a membrane device (72), an electrodialysis device (73), a resin deep impurity removal device (74) and an evaporation device (75).

2. The mobile device for obtaining lithium salt from salt lake brine according to claim 1, It is characterized in that The brine impurity removal device comprises an adsorption separation device (71), a membrane device (72), an electrodialysis device (73), a resin deep impurity removal device (74) and an evaporation device (75) which are connected in sequence; the evaporation device (75) is connected to a lithium precipitation device (76).

3. The mobile device for obtaining lithium salt from salt lake brine according to claim 2, It is characterized in that A plurality of movable boxes (1) are provided, and one or more of an adsorption separation device (71), a membrane device (72), an electrodialysis device (73), a resin deep impurity removal device (74), an evaporation device (75) and a lithium precipitation device (76) are provided in one movable box (1).

4. The mobile device for obtaining lithium salt from salt lake brine according to claim 2, It is characterized in that The adsorption separation device (71), the membrane device (72), the electrodialysis device (73), the resin deep impurity removal device (74), the evaporation device (75) and the lithium precipitation device (76) are connected in sequence using quick connectors.

5. The mobile device for obtaining lithium salt from salt lake brine according to claim 1, It is characterized in that The movable test device comprises an acid-base preparation device (78) arranged in the movable housing (1); And / or, the movable test device comprises a pure water preparation device (77) arranged in the movable box (1).

6. The mobile device for obtaining lithium salt from salt lake brine according to claim 1, It is characterized in that Base frames (2) are fixedly installed on both sides of the movable box body (1); a brine impurity removal device and a lithium precipitation device (76) are arranged on the base frames (2).

7. The mobile device for obtaining lithium salt from salt lake brine according to claim 1, It is characterized in that The movable box (1) is provided with exhaust facilities (5), and / or the movable box (1) is provided with lighting facilities (6).

8. The mobile device for obtaining lithium salt from salt lake brine according to claim 1, It is characterized in that The membrane device (72) comprises a reverse osmosis device (721) and a nanofiltration device (722) which are connected in sequence.

9. The mobile device for obtaining lithium salt from salt lake brine according to claim 1, It is characterized in that The reverse osmosis device (721) comprises a first membrane support (7212), and an RO membrane feed pump (7213), a first membrane tube (7211), and an RO membrane discharge storage tank (7215) which are arranged on the first membrane support (7212) and are connected in sequence; And / or, the nanofiltration device (722) comprises a second membrane support (7222) and a NF membrane feed pump (7223), a second membrane tube (7221) and a NF membrane discharge storage tank (7225) which are arranged on the second membrane support (7222) and are connected in sequence.

10. The mobile device for obtaining lithium salt from salt lake brine according to claim 1, It is characterized in that The electrodialysis device (73) comprises a first support (732), and an electrodialysis feed pump (734), a first membrane stack (731), and an electrodialysis output storage tank (735) which are arranged on the first support (732) and are connected in sequence; And / or, the resin deep impurity removal device (74) comprises a second bracket (742), and a resin impurity removal feed pump (743), a resin column (741), and a resin discharge storage tank (744) which are arranged on the second bracket (742) and are sequentially connected; And / or, the lithium precipitation device (76) comprises a lithium precipitation feed pump (761), a lithium precipitation reaction kettle (762), a thickener (764), a solid-liquid separation component (765), a washing component (766) and a drying component (767) which are connected in sequence; and a stirring component (763) is provided in the lithium precipitation reaction kettle (762).

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