Device for extracting lithium from salt lake brine with high magnesium-lithium ratio

Abstract

The utility model relates to the technical field of extraction of lithium from salt lake brine with high magnesium-lithium ratio, in particular to a device for extracting lithium from salt lake brine with high magnesium-lithium ratio, which comprises a device main body, the top of the device main body is sequentially provided with a magnesium removal tank, a secondary magnesium removal box and a lithium carbonate preparation tank from left to right, a controller is installed at the top of the device body and located at the front edge of the lithium carbonate preparation tank, a brine inlet pipe is installed at the center of the top of the magnesium removal tank in a penetrating mode, and a first flow control valve pipe and a safety pressure valve are installed at the positions, located on the two sides of the brine inlet pipe, of the top of the magnesium removal tank in a penetrating mode correspondingly; the device is simple in structure, boron and magnesium form a boron-magnesium double salt or carbonate coprecipitation to realize separation from lithium in an alkaline environment with accurate and automatic quantity-controlled feeding and temperature-controlled pressure control, sodium hydroxide is added into mother liquor for deep magnesium removal, then sodium carbonate is used for precipitation and collection of lithium carbonate with high recovery rate, the device is suitable for salt lake brine with higher magnesium-lithium ratio, and the device is suitable for industrial production. The practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium extraction from high magnesium-lithium ratio salt lake brine, and specifically relates to a device for extracting lithium from high magnesium-lithium ratio salt lake brine. Background Technique

[0002] Salt lakes are usually located underground or on the surface and are rich in lithium resources. The device for extracting lithium from high magnesium-lithium ratio salt lake brine is mainly used to overcome the technical problems of lithium extraction from high magnesium-lithium ratio salt lake brine and improve the recovery rate and purity of lithium in the high magnesium-lithium ratio salt lake brine extraction equipment.

[0003] In the prior art, the lithium extraction device is not convenient for accurate automatic metering feeding and temperature and pressure control in an alkaline environment, so that boron and magnesium form boromagnesium double salts or carbonate coprecipitates to achieve separation from lithium. At the same time, it does not have a solid-liquid separation structure that is easy to clean for secondary demagnesium operation, cannot achieve deep demagnesium by adding NaOH to the mother liquor, and is not convenient for precipitating and collecting lithium carbonate with high recovery rate using soda ash after deep demagnesium, and is not well applicable to high magnesium-lithium ratio salt lake brine.

[0004] Therefore, it is necessary to design a device for extracting lithium from high magnesium-lithium ratio salt lake brine to solve the above-mentioned problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a device for extracting lithium from high magnesium-lithium ratio salt lake brine, so as to improve the convenience of the lithium extraction device for accurate automatic metering feeding and temperature and pressure control in an alkaline environment, so that boron and magnesium form boromagnesium double salts or carbonate coprecipitates to achieve separation from lithium. At the same time, secondary demagnesium operation is carried out in a solid-liquid separation structure that is easy to clean, deep demagnesium is achieved by adding NaOH to the mother liquor, and it is convenient to precipitate and collect lithium carbonate with high recovery rate using soda ash after deep demagnesium, so as to be applicable to higher magnesium-lithium ratio salt lake brine, thereby solving the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A device for extracting lithium from high-magnesium-lithium ratio salt lake brine, comprising a device main body. At the top of the device main body, a magnesium removal tank, a secondary magnesium removal box and a lithium carbonate preparation tank are successively installed from left to right. At the front edge of the lithium carbonate preparation tank at the top of the device main body, a controller is installed. At the center of the top of the magnesium removal tank, a brine inlet pipe is installed through. On both sides of the brine inlet pipe at the top of the magnesium removal tank, a first flow control valve pipe and a safety pressure valve are respectively installed through. An electric heating plate is embedded in the inner wall of the magnesium removal tank. A temperature sensor and a pH sensor are successively installed along the lower edge on the left side inside the magnesium removal tank. A first electric control valve pipe is installed on the right side of the magnesium removal tank. Inside the secondary magnesium removal box, a solid-liquid separation chamber and a mother liquor magnesium removal chamber are successively arranged from front to back. A first liquid pump is installed through and connected between the first electric control valve pipe and the solid-liquid separation chamber of the secondary magnesium removal box. A second liquid pump is installed through and connected between the solid-liquid separation chamber and the mother liquor magnesium removal chamber. Clamps are arranged on the inner walls of the solid-liquid separation chamber and the mother liquor magnesium removal chamber. A filter plate is installed inside the clamp embedded in the top of the secondary magnesium removal box. Drain valve pipes penetrate through the left side of the secondary magnesium removal box on the inner walls of the solid-liquid separation chamber and the mother liquor magnesium removal chamber. Auxiliary valve pipes are installed through and connected to the inside of the solid-liquid separation chamber and the mother liquor magnesium removal chamber on the left side at the top of the secondary magnesium removal box. A third liquid pump is installed through and connected to the inside of the mother liquor magnesium removal chamber of the secondary magnesium removal box on the left side of the lithium carbonate preparation tank. A motor is embedded in the top of the lithium carbonate preparation tank. The output end at the bottom of the motor extends into the lithium carbonate preparation tank and a rotating shaft is installed. A scraping frame is sleeved and installed at the bottom end of the rotating shaft. A second flow control valve pipe is installed on the right side at the top of the lithium carbonate preparation tank. A second electric control valve pipe is installed through and connected to the lower edge on the right side of the lithium carbonate preparation tank. A third electric control valve pipe is installed through and connected to the bottom end of the lithium carbonate preparation tank.

[0008] As a preferred solution of the present utility model, both the first flow control valve pipe and the second flow control valve pipe are composed of an electric control flow regulating valve and a flow meter. Among them, the flow meter adopts any one of a microwave solid flow meter or a liquid flow meter according to the form of the added alkaline precipitant and soda ash.

[0009] As a preferred solution of the present utility model, there are two clamps and two filter plates. A handle is installed on the top of the filter plate. And fixing bolts are embedded and connected to the top of the clamp at the front and rear ends of the top of the filter plate.

[0010] As a preferred solution of the present utility model, filter meshes are embedded and installed on both sides of the filter plate. And a magnesium removal filter material is arranged between the two filter meshes inside the filter plate.

[0011] As a preferred solution of the present utility model, the scraping frame is in a U-shaped scraper structure. And the upper edge inside the scraping frame is connected to the periphery of the rotating shaft through a connecting rod for assistance.

[0012] As a preferred embodiment of the present utility model, a filter screen is installed at one end of the interior of the second electric control valve pipe close to the lithium carbonate preparation tank.

[0013] As a preferred embodiment of the present utility model, a control panel is provided on the controller, and the control panel is electrically connected to the electrical components of the magnesium removal tank, the secondary magnesium removal tank, and the lithium carbonate preparation tank.

[0014] Beneficial effects: Aiming at the problem in the prior art that the recovery rate of lithium carbonate from salt lake brine with a high magnesium-lithium ratio cannot be improved, in the present utility model, the first flow control valve pipe is provided to facilitate the accurate metering of the alkaline precipitant added to the magnesium removal tank, and the pH sensor provided in the magnesium removal tank controls the pH value at And through the cooperation of the temperature sensor, the electric heating plate and the safety pressure valve, the interior of the magnesium removal tank is controlled at a certain temperature and pressure to perform magnesium removal treatment on the brine after the potassium-magnesium mixed salt is precipitated by evaporation and concentration in the salt field, so that boron and magnesium are co-precipitated. After the solution inside the magnesium removal tank is input into the solid-liquid separation chamber by the first liquid pump and solid-liquid separation is carried out through the provided filter plate, the mother liquor is input into the mother liquor magnesium removal chamber by the second liquid pump, NaOH is added through the auxiliary valve pipe, and after deep magnesium removal through the filter plate, it is transported to the lithium carbonate preparation tank by the third liquid pump. Then, through the second flow control valve pipe of the lithium carbonate preparation tank, soda ash is accurately metered and added to prepare lithium carbonate products. The second electric control valve pipe with the provided filter screen intercepts the precipitated lithium carbonate, and the lithium carbonate in the lithium carbonate preparation tank is collected by the provided scraping rack and centrally output and collected through the third electric control valve pipe. The recovery rate of lithium by this method reaches At the same time, by setting the detachable filter plate, it is convenient to replace and clean to ensure the filtering and magnesium removal effect. The overall device has a simple structure and is convenient for accurate automatic metering of feeding, temperature control and pressure control in an alkaline environment, so that boron and magnesium form a boromagnesium double salt or carbonate co-precipitate to achieve separation from lithium. At the same time, secondary magnesium removal is carried out in a solid-liquid separation structure that is easy to clean, NaOH is added to the mother liquor for deep magnesium removal, and it is convenient to precipitate and collect high-recovery lithium carbonate with soda ash after deep magnesium removal, so as to be applicable to salt lake brine with a higher magnesium-lithium ratio. Description of the Drawings

[0015] Figure 1 It is an overall three-dimensional view of a device for extracting lithium from salt lake brine with a high magnesium-lithium ratio according to the present utility model;

[0016] Figure 2 It is an overall front view internal structure schematic diagram of a device for extracting lithium from salt lake brine with a high magnesium-lithium ratio according to the present utility model;

[0017] Figure 3 It is an overall top view internal structure schematic diagram of a device for extracting lithium from salt lake brine with a high magnesium-lithium ratio according to the present utility model;

[0018] Figure 4This is a schematic internal structure diagram of a lithium carbonate preparation tank of a device for extracting lithium from high-magnesium-lithium ratio salt lake brine according to the present utility model.

[0019] In the figure: 1. Device main body; 2. Demagnesium tank; 21. Brine inlet pipe; 22. First flow control valve pipe; 23. Safety pressure valve; 24. Electric heating plate; 25. Temperature sensor; 26. pH sensor; 27. First electric control valve pipe; 3. Secondary demagnesium box; 31. Solid-liquid separation cavity; 32. Mother liquid demagnesium cavity; 33. Card seat; 34. Filter plate; 35. Drain valve pipe; 36. Auxiliary valve pipe; 4. Lithium carbonate preparation tank; 41. Motor; 411. Rotating shaft; 412. Scraping frame; 42. Second flow control valve pipe; 43. Second electric control valve pipe; 431. Filter screen; 44. Third electric control valve pipe; 5. First liquid pump; 6. Second liquid pump; 7. Third liquid pump; 8. Controller. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant. Several embodiments of the present utility model are given. However, the present utility model 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 utility model more thorough and comprehensive.

[0022] It should be noted that when an element is referred to as being "fixedly provided on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

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

[0024] Please refer to Figures 1-4, the present utility model provides a technical solution:

[0025] A device for extracting lithium from high-magnesium-lithium ratio salt lake brine, comprising a device main body 1. On the top of the device main body 1, a magnesium removal tank 2, a secondary magnesium removal tank 3, and a lithium carbonate preparation tank 4 are sequentially installed from left to right. A controller 8 is installed at the front edge of the lithium carbonate preparation tank 4 on the top of the device main body 1. A control panel is arranged on the controller 8, and the control panel is electrically connected to the electrical components of the magnesium removal tank 2, the secondary magnesium removal tank 3, and the lithium carbonate preparation tank 4. A brine inlet pipe 21 is installed through the center of the top of the magnesium removal tank 2. On both sides of the brine inlet pipe 21 at the top of the magnesium removal tank 2, a first flow control valve pipe 22 and a safety pressure valve 23 are respectively installed through. An electric heating plate 24 is embedded in the inner wall of the magnesium removal tank 2. A temperature sensor 25 and a pH sensor 26 are sequentially installed along the lower edge on the left side inside the magnesium removal tank 2. A first electric control valve pipe 27 is installed on the right side of the magnesium removal tank 2. Inside the secondary magnesium removal tank 3, a solid-liquid separation chamber 31 and a mother liquor magnesium removal chamber 32 are sequentially arranged from front to back. A first liquid pump 5 is installed through and connected between the first electric control valve pipe 27 and the solid-liquid separation chamber 31 of the secondary magnesium removal tank 3. A second liquid pump 6 is installed through and connected between the solid-liquid separation chamber 31 and the mother liquor magnesium removal chamber 32. Clamps 33 are arranged on the inner walls of the solid-liquid separation chamber 31 and the mother liquor magnesium removal chamber 32. A filter plate 34 is installed inside the clamps 33 on the top of the secondary magnesium removal tank 3. Drain valve pipes 35 are installed through the left side of the secondary magnesium removal tank 3 on the inner walls of the solid-liquid separation chamber 31 and the mother liquor magnesium removal chamber 32. Auxiliary valve pipes 36 are installed through and connected to the inside of the solid-liquid separation chamber 31 and the mother liquor magnesium removal chamber 32 on the left side of the top of the secondary magnesium removal tank 3. A third liquid pump 7 is installed through and connected to the inside of the mother liquor magnesium removal chamber 32 of the secondary magnesium removal tank 3 on the left side of the lithium carbonate preparation tank 4. A second flow control valve pipe 42 is installed on the right side of the top of the lithium carbonate preparation tank 4. A second electric control valve pipe 43 is installed through and connected to the lower edge on the right side of the lithium carbonate preparation tank 4. A third electric control valve pipe 44 is installed through and connected to the bottom end of the lithium carbonate preparation tank 4. A filter screen 431 is installed at one end of the second electric control valve pipe 43 close to the lithium carbonate preparation tank 4. A motor 41 is embedded in the top of the lithium carbonate preparation tank 4. The bottom output end of the motor 41 extends into the lithium carbonate preparation tank 4 and is installed with a rotating shaft 411. A scraping frame 412 is sleeved and installed at the bottom end of the rotating shaft 411. The scraping frame 412 has a U-shaped scraper structure, and the upper edge inside the scraping frame 412 is connected to the periphery of the rotating shaft 411 through a connecting rod. After the solution inside the magnesium removal tank 2 is input into the solid-liquid separation chamber 3 through the first liquid pump 5 and undergoes solid-liquid separation through the set filter plate, the mother liquor is input into the mother liquor magnesium removal chamber 32 through the second liquid pump 6, NaOH is added through the auxiliary valve pipe 36, and after deep magnesium removal through the filter plate 34, it is transported to the lithium carbonate preparation tank 4 by the third liquid pump 7. Then, soda ash is accurately metered and added through the second flow control valve pipe 42 of the lithium carbonate preparation tank 4 to prepare lithium carbonate products. The precipitate lithium carbonate is intercepted by the second electric control valve pipe 43 provided with the filter screen 431, and the lithium carbonate inside the lithium carbonate preparation tank 4 is collected through the set scraping frame 412 and centrally output and collected through the third electric control valve pipe 44.The lithium recovery rate of this method reaches

[0026] Specifically, both the first flow control valve pipe 22 and the second flow control valve pipe 42 are composed of an electrically controlled flow regulating valve and a flow meter. Among them, the flow meter adopts either a microwave solid flow meter or a liquid flow meter according to the forms of the added alkaline precipitant and soda ash. By setting the first flow control valve pipe 22, it is convenient to accurately control the amount of alkaline precipitant added to the demagnesium tank 2. The pH sensor 26 installed in the demagnesium tank 2 controls the pH value within And through the temperature sensor 25, in cooperation with the electric heating plate and the safety pressure valve 23, the interior of the demagnesium tank 2 is controlled at a certain temperature and pressure to perform demagnesium treatment on the brine after potassium and magnesium mixed salts are precipitated by evaporation and concentration in the salt pan, so that boron and magnesium are co-precipitated.

[0027] Preferably, there are two clamping seats 33 and filter plates 34 respectively. A handle is installed at the top of the filter plate 34, and fixing bolts are embedded and installed at the front and rear ends of the top of the filter plate 34 on the top of the clamping seat 33. Filter nets are embedded and installed on both sides of the filter plate 34, and a magnesium removal filter material is arranged between the two filter nets inside the filter plate 34. By setting the detachable filter plate 34, it is convenient to replace and clean to ensure the filter demagnesium effect.

[0028] In summary, the utility model is not only simple in structure, but also convenient for accurate automatic quantitative feeding and temperature and pressure control in an alkaline environment, enabling boron and magnesium to form a boron-magnesium double salt or carbonate co-precipitate to achieve separation from lithium. After adding NaOH to the mother liquor for deep magnesium removal and then precipitating and collecting lithium carbonate with high recovery rate using soda ash, it is applicable to salt lake brines with a higher magnesium-lithium ratio and is very practical.

[0029] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for extracting lithium from brine with a high magnesium-lithium ratio, comprising a device body (1), characterized in that The top of the device body (1) is provided with a demagnesiumizing tank (2), a secondary demagnesiumizing tank (3) and a lithium carbonate preparation tank (4) in sequence from left to right. The top of the device body (1) is provided with a controller (8) at the front edge of the lithium carbonate preparation tank (4). A brine inlet pipe (21) is installed through the center of the top of the demagnesiumizing tank (2). A first flow control valve pipe (22) and a safety pressure valve (23) are installed through the top of the demagnesiumizing tank (2) and on both sides of the brine inlet pipe (21). An electric heating plate (24) is embedded in the inner wall of the demagnesiumizing tank (2). ) is sequentially installed at the lower left edge of the interior of the magnesium removal tank (2); a first electric control valve tube (27) is installed on the right side of the magnesium removal tank (2); a solid-liquid separation chamber (31) and a mother liquid magnesium removal chamber (32) are sequentially arranged inside the secondary magnesium removal box (3) from front to back; a first liquid pump (5) is installed in a through-connection between the first electric control valve tube (27) and the solid-liquid separation chamber (31) of the secondary magnesium removal box (3); a second liquid pump (6) is installed in a through-connection between the solid-liquid separation chamber (31) and the mother liquid magnesium removal chamber (32); The inner wall of the magnesium removal chamber (32) is provided with a holder (33); the top of the secondary magnesium removal box (3) is embedded in the inner side of the holder (33) and is provided with a filter plate (34); the inner walls of the solid-liquid separation chamber (31) and the mother liquid magnesium removal chamber (32) are both penetrated through the left side of the secondary magnesium removal box (3) and are provided with a drain valve pipe (35); the left side of the top of the secondary magnesium removal box (3) is penetrated through the interior of the solid-liquid separation chamber (31) and the mother liquid magnesium removal chamber (32) and is provided with an auxiliary valve pipe (36); the left side of the lithium carbonate preparation tank (4) is penetrated through the interior of the mother liquid magnesium removal chamber (32) of the secondary magnesium removal box (3) and is provided with a A third liquid pump (7) is installed, a motor (41) is embedded in the top of the lithium carbonate preparation tank (4), the bottom output end of the motor (41) extends to the inside of the lithium carbonate preparation tank (4) and is installed with a rotating shaft (411), the bottom end of the rotating shaft (411) is sleeved with a scraper (412), a second flow control valve tube (42) is installed on the right side of the top of the lithium carbonate preparation tank (4), a second electric control valve tube (43) is installed on the lower edge of the right side of the lithium carbonate preparation tank (4), and a third electric control valve tube (44) is installed on the bottom end of the lithium carbonate preparation tank (4).

2. The device for extracting lithium from salt lake brine with a high magnesium-to-lithium ratio according to claim 1, characterized in that: The first flow control valve tube (22) and the second flow control valve tube (42) are both composed of an electrically controlled flow regulating valve and a flow meter, wherein the flow meter is a microwave solid flow meter or a liquid flow meter according to the form of the added alkaline precipitant and soda ash.

3. The device for extracting lithium from high magnesium-to-lithium ratio salt lake brine according to claim 1, characterized in that: The holder (33) and the filter plate (34) are both provided with two, a handle is installed on the top of the filter plate (34), and the front and rear ends of the top of the filter plate (34) are embedded in the top of the connection holder (33) and fixed bolts are installed.

4. The device for extracting lithium from salt lake brine with a high magnesium-to-lithium ratio according to claim 3, characterized in that: Filter screens are embedded and installed on both sides of the filter plate (34), and a magnesium removal filter material is arranged inside the filter plate (34) and between the two filter screens.

5. The device for extracting lithium from salt lake brine with a high magnesium-to-lithium ratio according to claim 1, characterized in that: The scraper frame (412) is a U-shaped scraper structure, and the inner upper edge of the scraper frame (412) is auxiliaryly connected to the periphery of the rotating shaft (411) through a connecting rod.

6. The device for extracting lithium from high magnesium-to-lithium ratio salt lake brine according to claim 1, characterized in that: A filter screen (431) is installed at one end of the interior of the second electrically controlled valve tube (43) close to the lithium carbonate preparation tank (4).

7. The device for extracting lithium from high magnesium-to-lithium ratio salt lake brine according to claim 1, characterized in that: The controller (8) is provided with a control panel, and the control panel is electrically connected to the electrical components of the magnesium removal tank (2), the secondary magnesium removal box (3) and the lithium carbonate preparation tank (4).

Images