CN218893466U

CN218893466U - Lithium system is carried to salt lake brine

Info

Publication number: CN218893466U
Application number: CN202222624752.8U
Authority: CN
Inventors: 沃炭源
Original assignee: Shanghai Wotanyuan Investment Management Co ltd
Current assignee: Shanghai Wotanyuan Investment Management Co ltd
Priority date: 2022-10-08
Filing date: 2022-10-08
Publication date: 2023-04-21
Anticipated expiration: 2032-10-08

Abstract

The utility model discloses a salt lake brine lithium extraction system, which comprises a DF membrane pretreatment device, a NF membrane separation device, an ED ion membrane concentration device, a lithium carbonate precipitation device and a crushing and packaging device, wherein the DF membrane pretreatment device comprises a DF membrane separation device, a filtration membrane separation device and a filtration membrane separation device: the DF film pretreatment device, the NF film separation device, the ED ion film concentration device, the lithium carbonate precipitation device and the crushing and packaging device are connected through pipelines in sequence; the lithium carbonate precipitation device comprises a storage mechanism capable of storing concentrated lithium chloride solution, a conveying mechanism capable of conveying the concentrated lithium chloride solution and a mud scraping mechanism capable of scraping off lithium carbonate precipitation, wherein the conveying mechanism is arranged above the storage mechanism, and the mud scraping mechanism is arranged in an inner cavity of the storage mechanism. The utility model overcomes the defects of poor separation effect, low product purity, large equipment investment and high system energy consumption in the conventional process, can stably run for a long time, and realizes the concentration and refining of the lithium chloride solution, wherein the concentration of lithium ions in the formed lithium chloride solution is higher than 120 g/L.

Description

Lithium system is carried to salt lake brine

Technical Field

The utility model belongs to the technical field of salt lake brine utilization, and particularly relates to a salt lake brine lithium extraction system.

Background

The first problem to be solved in the production of salt lake battery grade lithium carbonate is the difficulty in magnesium-lithium separation of salt lake brine with high magnesium-lithium ratio, the traditional process adopts a lithium adsorbent process, and lithium chloride solution is formed by selective adsorption of lithium chloride in the salt lake brine and fresh water desorption of the lithium adsorbent, however, the amount of the adsorbent is large, a large amount of adsorbent is needed to be supplemented each year, the adsorption effect is unstable, the engineering investment is large, and the operation cost is high; ion selective membrane technology is also adopted, and lithium chloride solution is formed by intercepting divalent ions such as magnesium ions, sulfate radicals and the like in salt lake brine; the extraction method and nanofiltration membrane technology are also applied to the extraction of lithium from brine with high magnesium-lithium ratio, but are still in the industrial test and construction stage, and industrial mass production is not formed yet.

Therefore, in order to meet the quality and economical requirements of battery-grade lithium carbonate products, the equipment investment and the operation cost are further reduced, and the separation effect of extracting lithium from brine is further improved.

Disclosure of Invention

The purpose of the utility model is that: the system overcomes the defects of poor separation effect, low product purity, large equipment investment and high system energy consumption in the conventional process, can stably operate for a long time, realizes concentration and refining of lithium chloride solution, and has the concentration of lithium ions higher than 120 g/L.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a salt lake brine lithium extraction system comprising:

comprises a DF film pretreatment device, a NF film separation device, an ED ion film concentration device, a lithium carbonate precipitation device and a crushing and packaging device:

the DF film pretreatment device, the NF film separation device, the ED ion film concentration device, the lithium carbonate precipitation device and the crushing packaging device are connected through pipelines in sequence;

the lithium carbonate precipitation device comprises a storage mechanism capable of storing concentrated lithium chloride solution, a conveying mechanism capable of conveying the concentrated lithium chloride solution and a mud scraping mechanism capable of scraping off lithium carbonate precipitation, wherein the conveying mechanism is arranged above the storage mechanism, and the mud scraping mechanism is arranged in an inner cavity of the storage mechanism.

As the preferable technical scheme, storage mechanism includes the precipitation tank, the bottom of precipitation tank is the inverted cone form structure, the center department intercommunication of precipitation tank bottom has row material pipe, the surface intercommunication of precipitation tank has the drain pipe, all install the valve on row material pipe and the drain pipe.

As an optimal technical scheme, the bottom of the precipitation tank is welded with supporting legs.

As the preferable technical scheme, the conveying mechanism comprises a guide pipe which is communicated with the liquid discharge end of the ED ion membrane concentration device, and the other end of the guide pipe penetrates through the upper part of the inner cavity of the precipitation tank and is provided with a filtering piece.

As a preferable technical scheme, the filter element comprises a hollow tube cover which is connected with the end part of the catheter in a threaded manner, and a filter screen is arranged in the inner cavity of the hollow tube cover.

As the preferred technical scheme, mud scraping mechanism is including installing in the support at precipitation tank top, the motor is installed to one side of support, the output shaft of motor runs through to the inner chamber of precipitation tank and fixedly connected with pivot, the fixed surface of pivot is connected with can with the scraping frame of precipitation tank internal face laminating, the bottom fixedly connected with of scraping the frame scrapes the strip.

As the preferable technical scheme, scrape the frame and scrape the first reinforcement strip of fixedly connected with between the strip, pivot and scrape the contained angle department slope fixedly connected with second reinforcement strip between the frame, the other end of second reinforcement strip and scrape the interior angle fixed connection that the frame corresponds.

As the preferable technical scheme, the upper portion of pivot surface rotates and is connected with the support, the both ends of support all with the internal face fixed connection of precipitation tank.

The utility model has at least the following beneficial effects:

according to the utility model, impurities such as calcium and magnesium remained in salt lake brine are fully removed through a DF film pretreatment device; removing most sulfate radicals, magnesium ions, boron ions and other impurity metal ions in salt lake brine by an NF membrane separation device; selectively concentrating lithium chloride to 120g/L by an ED ion membrane concentration device; the salt lake brine is treated by the system to obtain a high-purity lithium chloride solution, the concentration reaches 120g/L, the high-efficiency lithium extraction of the salt lake brine by a full membrane method is realized, and the purity of a final lithium carbonate product reaches 99.5%.

Drawings

FIG. 1 is a workflow diagram of an embodiment of a salt lake brine lithium extraction system of the present utility model;

fig. 2 is a schematic structural diagram of a lithium carbonate precipitation device in an embodiment of a salt lake brine lithium extraction system according to the present utility model;

fig. 3 is a schematic diagram of a partial connection structure of a lithium carbonate precipitation device in an embodiment of a salt lake brine lithium extraction system according to the present utility model;

in the figure: 1. a lithium carbonate precipitation device; 110. a storage mechanism; 111. a precipitation tank; 112. a discharge pipe; 113. a liquid outlet pipe; 114. a valve; 115. a support leg; 120. a conveying mechanism; 121. a conduit; 122. a filter; 1221. a hollow tube cover; 1222. a filter screen; 130. a mud scraping mechanism; 131. a support; 132. a motor; 133. a rotating shaft; 134. a scraping frame; 135. scraping the strip; 136. a first reinforcing strip; 137. a second reinforcing strip; 138. and (3) a bracket.

Detailed Description

In order that those skilled in the art will better understand the present utility model, the following technical scheme of the present utility model will be further described with reference to the accompanying drawings and examples.

Referring to fig. 1-3, the salt lake brine lithium extraction system of the utility model comprises a DF membrane pretreatment device capable of sufficiently removing calcium and magnesium ions and other impurities in the salt lake brine, an NF membrane separation device (the rejection rate of divalent ions is greater than 98%) capable of sufficiently separating monovalent ions from divalent ions in the salt lake brine, an ED ion membrane concentration device (the ED ion membrane concentration device only allows monovalent ions to pass through and concentrate, divalent ions and more than divalent ions are trapped at the water end of a product), a lithium carbonate precipitation device 1 and a crushing and packaging device: the DF film pretreatment device, the NF film separation device, the ED ion film concentration device, the lithium carbonate precipitation device 1 and the crushing and packaging device are connected through pipelines in sequence; the lithium carbonate precipitation device 1 comprises a storage mechanism 110 capable of storing concentrated lithium chloride solution, a conveying mechanism 120 capable of conveying the concentrated lithium chloride solution and a mud scraping mechanism 130 capable of scraping off lithium carbonate precipitation, wherein the conveying mechanism 120 is arranged above the storage mechanism 110, and the mud scraping mechanism 130 is arranged in an inner cavity of the storage mechanism 110.

The storage mechanism 110 comprises a sedimentation tank 111, the top of the sedimentation tank 111 is of an open structure, the bottom of the sedimentation tank 111 is of an inverted cone structure, a discharge pipe 112 is communicated with the center of the bottom of the sedimentation tank 111, a liquid outlet pipe 113 is communicated with the surface of the sedimentation tank 111, valves 114 are arranged on the discharge pipe 112 and the liquid outlet pipe 113, and at least three liquid outlet pipes 113 are sequentially arranged on the surface of the sedimentation tank 111 from top to bottom.

Legs 115 are welded to the bottom of the precipitation tank 111. The support legs 115 can be used for supporting and lifting the sedimentation tank 111, and the discharge pipe 112 is far away from the ground so as to be convenient for discharging and receiving materials.

The conveying mechanism 120 comprises a conduit 121 communicated with the liquid discharge end of the ED ion membrane concentration device, and the other end of the conduit 121 penetrates to the upper part of the inner cavity of the precipitation tank 111 and is provided with a filtering piece 122.

The filter 122 includes a hollow tube cover 1221 screwed to the end of the guide tube 121, and a filter screen 1222 is installed in the inner cavity of the hollow tube cover 1221. The concentrated lithium chloride solution can be filtered by the filter 122, so that residues can be effectively screened, and the lithium extraction effect is further improved. In order to ensure the stability of the conduit 121 during discharging, the surface of the conduit 121 is fixedly connected with the upper part of the inner wall surface of the precipitation tank 111 through a hoop.

The mud scraping mechanism 130 comprises a support 131 arranged at the top of the sedimentation tank 111, a motor 132 is arranged on one side of the support 131, an output shaft of the motor 132 penetrates through an inner cavity of the sedimentation tank 111 and is vertically fixedly connected with a rotating shaft 133, a scraping frame 134 which can be attached to the inner wall surface of the sedimentation tank 111 is fixedly connected to the surface of the rotating shaft 133, the scraping frame 134 is of a U-shaped structure, a scraping strip 135 is fixedly connected to the bottom of the scraping frame 134 in an inclined mode, and the inclination angle of the scraping strip 135 and the horizontal plane is identical to the slope angle of the bottom of the sedimentation tank 111. The output shaft of the motor 132 is utilized to drive the scraping frame 134 and the scraping strip 135 to rotate by taking the rotating shaft 133 as an axis, so that a large amount of lithium carbonate precipitate is effectively prevented from adhering to the inner wall of the precipitation tank 111.

The scraping frame 134 is fixedly connected with a first reinforcing strip 136 between the scraping frame 135, a second reinforcing strip 137 is obliquely and fixedly connected at an included angle between the rotating shaft 133 and the scraping frame 134, and the other end of the second reinforcing strip 137 is fixedly connected with an inner angle corresponding to the scraping frame 134. The reinforcement of the scraper blade 134 and the scraper blade 135 can be achieved by the cooperation of the first reinforcement strip 136 and the second reinforcement strip 137.

The upper portion of pivot 133 surface rotates and is connected with support 138, and the both ends of support 138 all are fixed connection with the internal wall surface of precipitation tank 111. The support 138 is utilized to assist in supporting the rotating shaft 133, which helps to ensure the stability of the rotating shaft 133 during rotation.

The working principle of the utility model is as follows:

the salt lake brine is firstly subjected to separation of calcium and magnesium plasma through a DF film pretreatment device, water after separation is sent to a NF film separation device, separation of lithium chloride monovalent ions and divalent ions is carried out through the NF film separation device, then lithium chloride product water of the NF film separation device enters an ED ion film concentration device, the ED ion film concentration device is used for further separating and concentrating the lithium chloride product water, concentrated lithium chloride solution is conveyed to the inner cavity of a precipitation tank 111 through a guide pipe 121, the concentrated lithium chloride solution can be filtered through a filter screen 1222, the filtered concentrated lithium chloride solution falls into the inner cavity of the precipitation tank 111, after sodium carbonate is added into the precipitation tank 111 and is kept stand for a period of time, a valve 114 on a liquid outlet pipe 113 at a corresponding height is opened to discharge supernatant in the precipitation tank 111, a motor 132 is started through opening a valve on a discharge pipe 112, an output shaft of the motor 132 drives a rotating shaft 133, the rotating shaft 133 drives a scraping frame 134, a scraping bar 135, a first reinforcing bar 136 and a second reinforcing bar 137 synchronously rotate around the rotating shaft 133, so that the discharge rate of lithium carbonate precipitation is accelerated, the lithium carbonate precipitation is dried, and the lithium carbonate is finally crushed to reach the purity of 99.5% after the lithium carbonate precipitation is packaged and the product is crushed.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.

Claims

1. The utility model provides a salt lake brine draws lithium system which characterized in that includes DF membrane preprocessing device, NF membrane separation device, ED ion membrane enrichment facility, lithium carbonate precipitation plant (1) and smash packing plant:

the DF film pretreatment device, the NF film separation device, the ED ion film concentration device, the lithium carbonate precipitation device (1) and the crushing and packaging device are connected through pipelines in sequence;

the lithium carbonate precipitation device (1) comprises a storage mechanism (110) capable of storing concentrated lithium chloride solution, a conveying mechanism (120) capable of conveying the concentrated lithium chloride solution and a mud scraping mechanism (130) capable of scraping off lithium carbonate precipitation, wherein the conveying mechanism (120) is arranged above the storage mechanism (110), and the mud scraping mechanism (130) is arranged in an inner cavity of the storage mechanism (110).

2. The salt lake brine lithium extraction system of claim 1, wherein: the storage mechanism (110) comprises a sedimentation tank (111), the bottom of the sedimentation tank (111) is of an inverted conical structure, a discharge pipe (112) is communicated with the center of the bottom of the sedimentation tank (111), a liquid outlet pipe (113) is communicated with the surface of the sedimentation tank (111), and valves (114) are respectively arranged on the discharge pipe (112) and the liquid outlet pipe (113).

3. A salt lake brine lithium extraction system according to claim 2, wherein: the bottom of the precipitation tank (111) is welded with a supporting leg (115).

4. A salt lake brine lithium extraction system according to claim 2, wherein: the conveying mechanism (120) comprises a guide pipe (121) communicated with the liquid discharge end of the ED ion membrane concentration device, and the other end of the guide pipe (121) penetrates through the upper portion of the inner cavity of the precipitation tank (111) and is provided with a filtering piece (122).

5. The salt lake brine lithium extraction system of claim 4, wherein: the filter (122) comprises a hollow tube cover (1221) which is connected to the end part of the guide tube (121) in a threaded mode, and a filter screen (1222) is installed in the inner cavity of the hollow tube cover (1221).

6. A salt lake brine lithium extraction system according to claim 2, wherein: the mud scraping mechanism (130) comprises a support (131) arranged at the top of the sedimentation tank (111), a motor (132) is arranged on one side of the support (131), an output shaft of the motor (132) penetrates through an inner cavity of the sedimentation tank (111) and is fixedly connected with a rotating shaft (133), a scraping frame (134) which can be attached to the inner wall surface of the sedimentation tank (111) is fixedly connected to the surface of the rotating shaft (133), and a scraping strip (135) is fixedly connected to the bottom of the scraping frame (134).

7. The salt lake brine lithium extraction system of claim 6, wherein: the scraper frame (134) and the scraper bar (135) are fixedly connected with a first reinforcing bar (136), an included angle between the rotating shaft (133) and the scraper frame (134) is obliquely and fixedly connected with a second reinforcing bar (137), and the other end of the second reinforcing bar (137) is fixedly connected with an inner angle corresponding to the scraper frame (134).

8. The salt lake brine lithium extraction system of claim 6, wherein: the upper portion on pivot (133) surface rotates and is connected with support (138), the both ends of support (138) all are connected with the internal wall surface fixed of precipitation tank (111).