CN216236065U

CN216236065U - Lithium hexafluorophosphate deacidification purification device

Info

Publication number: CN216236065U
Application number: CN202122530537.7U
Authority: CN
Inventors: 周振伦; 蔡元礼; 宋文; 张虎; 吕福禄
Original assignee: Huichang Hongfu High Tech Material Co ltd
Current assignee: Huichang Hongfu High Tech Material Co ltd
Priority date: 2021-10-20
Filing date: 2021-10-20
Publication date: 2022-04-08
Anticipated expiration: 2031-10-20

Abstract

The utility model provides a lithium hexafluorophosphate deacidification purification device, and relates to the technical field of lithium hexafluorophosphate purification equipment. The device comprises an outer shell, an inner barrel, an annular plate, an interlayer is left between the inner barrel and the outer shell, the outer edge of the annular plate is fixedly connected with the inner wall of the outer shell, the inner edge of the annular plate is fixedly connected with the top end of the inner barrel, the interlayer forms a closed cavity, a liquid discharge pipe extending out of the outer shell is arranged on the lower portion of the side wall of the inner barrel, a filter screen barrel is arranged inside the inner barrel, a stirring mechanism is arranged inside the filter screen barrel, a discharging pipe extending out of the bottom of the outer shell is arranged at the bottom of the filter screen barrel, a first liquid adding pipe and a second liquid adding pipe which inject fluid into the filter screen barrel are arranged at the top of the outer shell, a refrigerating fluid inlet and a refrigerating fluid outlet are further formed in the side wall of the outer shell, a circulating pump is further connected onto the liquid discharge pipe, a circulating pipe and a valve, and the liquid outlet end of the circulating pump extends into the upper portion of the filter screen barrel. The utility model can carry out freezing crystallization, filtration and deacidification treatment on the lithium hexafluorophosphate saturated solution.

Description

Lithium hexafluorophosphate deacidification purification device

Technical Field

The utility model relates to the technical field of lithium hexafluorophosphate purification equipment, in particular to a lithium hexafluorophosphate deacidification and purification device.

Background

Lithium hexafluorophosphate is a lithium salt electrolyte which is most widely used in lithium ion batteries on the market at present because of high conductivity. Lithium hexafluorophosphate is used as an important component of the electrolyte, and the required purity is more than 99.9 percent. A commonly adopted synthesis method of lithium hexafluorophosphate comprises the steps of dissolving lithium fluoride by adopting an anhydrous hydrogen fluoride solution, introducing phosphorus pentafluoride gas to generate a lithium hexafluorophosphate solution, and then freezing, crystallizing, filtering and deacidifying to obtain pure lithium hexafluorophosphate. Therefore, the lithium hexafluorophosphate synthesis method can involve various devices such as a freezing crystallization device, a filtering device and a deacidification device in the processing process, the multiple devices are matched for use, the purchase cost is increased, a large-area field is occupied, especially, the whole synthesis process needs to be completed in a sealed environment, the sealing connection of multiple connecting parts among different devices needs to be realized, the difficulty of equipment installation is high, the risk of sealing failure is high, and the normal synthesis production of lithium hexafluorophosphate is severely restricted.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a lithium hexafluorophosphate deacidification purification device aiming at the defects or shortcomings in the prior art, the device can perform continuous integrated treatment of freezing crystallization, filtration and deacidification on lithium hexafluorophosphate saturated solution, the number of devices is reduced, the filtration is fast, the efficiency is high, and the operation is simple.

In order to achieve the purpose, the technical scheme adopted by the utility model is a lithium hexafluorophosphate deacidification purification device which comprises a shell, an inner cylinder and an annular plate, wherein an interlayer is arranged between the inner cylinder and the shell, the outer edge of the annular plate is fixedly connected with the inner wall of the shell, the inner edge of the annular plate is fixedly connected with the top end of the inner cylinder, so that the interlayer forms a closed cavity, a liquid discharge pipe extending out of the shell is arranged at the lower part of the side wall of the inner cylinder, a filter screen cylinder is arranged in the inner cylinder, a stirring mechanism is arranged in the filter screen cylinder, a discharge pipe extending out of the bottom of the shell is arranged at the bottom of the filter screen cylinder, a first liquid feeding pipe and a second liquid feeding pipe for injecting fluid into the filter screen cylinder are arranged at the top of the shell, a refrigerating fluid inlet which is respectively communicated with the interlayer is also arranged at the side wall of the shell, the refrigerating fluid outlet and the liquid discharge pipe are also connected with a circulating pump, a circulating pipe and a valve, the liquid outlet end of the circulating pipe extends into the upper part of the filter screen cylinder, and the liquid inlet end of the circulating pipe is positioned between the circulating pump and the valve.

Further, the filter screen cylinder comprises an upper outer frame, an upper inner frame, a filter screen, a lower inner frame and a lower outer frame, the upper end of the filter screen is fixed between the upper outer frame and the upper inner frame, the lower end of the filter screen is fixed between the lower inner frame and the lower outer frame, the middle part of the filter screen is in a shape of a circular truncated cone, the lower part of the filter screen is hemispherical, a supporting ring body is arranged on the outer side of the upper outer frame, the supporting ring body is installed on the annular plate, and a connector is arranged at the bottom of the lower outer frame and is fixedly connected with the upper end of the liquid discharge pipe.

Furthermore, a liquid distribution mechanism is arranged above the filter screen cylinder and comprises an annular liquid distribution pipe, the liquid distribution pipe is communicated with the lower end of the first liquid adding pipe, a plurality of nozzles are uniformly arranged at the bottom of the liquid distribution pipe, and the outer side of the liquid distribution pipe is fixedly connected with the inner wall of the top of the shell through a plurality of connecting rods which are symmetrically arranged.

Preferably, the outer diameter of the liquid distribution pipe is smaller than the inner diameter of the upper inner frame.

Further, the stirring mechanism comprises a vertical rotating shaft and a spiral blade arranged on the rotating shaft, and the upper end of the rotating shaft is coaxially connected with an output shaft of a rotating motor arranged in the middle of the top of the shell.

Furthermore, an overflow pipe is arranged outside the shell, one end of the overflow pipe is communicated with the upper part of the inner barrel, and the other end of the overflow pipe is communicated with a liquid discharge pipe.

The beneficial technical effects of the utility model are as follows: the lithium hexafluorophosphate deacidification purification device can carry out continuous integrated treatment of freezing crystallization, filtration and deacidification on lithium hexafluorophosphate saturated solution, reduces the number of devices, and is quick in filtration, high in efficiency and simple in operation; through arranging the interlayer with the closed cavity, freezing and crystallizing the lithium hexafluorophosphate saturated solution in the inner cylinder by utilizing the interlayer, filtering by utilizing the filter screen cylinder, and sending the unfiltered crystal suspension outside the filter screen cylinder in the inner cylinder into the filter screen cylinder for filtering by the arranged circulating pump and circulating pipe, and realizing multiple times of circulating filtration and deacidification washing; and the stirring mechanism and the liquid distribution mechanism are adopted to improve the filtering, deacidifying and washing efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a lithium hexafluorophosphate deacidification purification apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of the filter screen cartridge of FIG. 1;

FIG. 3 is a top view of the filter screen cartridge of FIG. 2;

reference numerals: 1-outer shell, 2-inner cylinder, 3-annular plate, 4-first liquid adding pipe, 5-second liquid adding pipe, 6-refrigerating fluid inlet, 7-refrigerating fluid outlet, 8-liquid discharging pipe, 9-liquid distributing pipe, 10-nozzle, 11-connecting rod, 12-rotating motor, 13-rotating shaft, 14-helical blade, 15-filter screen cylinder, 1501-upper outer frame, 1502-upper inner frame, 1503-filter screen, 1504-lower inner frame, 1505-lower outer frame, 1506-connector, 16-discharging pipe, 17-supporting ring body, 18-circulating pump, 19-circulating pipe, 20-overflow pipe and 21-valve.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Examples

Referring to fig. 1-3, the lithium hexafluorophosphate deacidification and purification apparatus disclosed in this embodiment includes a housing 1, an inner cylinder 2, and an annular plate 3, wherein an interlayer is left between the inner cylinder 2 and the housing 1, the outer edge of the annular plate 3 is fixedly connected with the inner wall of the housing 1, the inner edge of the annular plate 3 is fixedly connected with the top end of the inner cylinder 2, so that the interlayer forms a closed cavity, a drain pipe 8 extending out of the housing 1 is disposed at the lower portion of the side wall of the inner cylinder 2, a filter screen 1503 cylinder 15 is disposed inside the inner cylinder 2, a stirring mechanism is disposed inside the filter screen 1503 cylinder 15, a drain pipe 16 extending out of the bottom of the housing 1 is disposed at the bottom of the filter screen 1503 cylinder 15, a first liquid feeding pipe 4 and a second liquid feeding pipe 5 for feeding fluid into the filter screen 1503 cylinder 15 are disposed at the top of the housing 1, a freezing liquid inlet 6 and a freezing liquid outlet 7 are disposed at the side wall of the housing 1, and a circulation pump 18 is connected to the drain pipe 8, A circulating pipe 19 and a valve 21, wherein the liquid outlet end of the circulating pipe 19 extends into the upper part of the filter screen 1503 cylinder 15, and the liquid inlet end of the circulating pipe 19 is positioned between the circulating pump 18 and the valve 21; the filter screen 1503 comprises an upper outer frame 1501, an upper inner frame 1502, a filter screen 1503, a lower inner frame 1504 and a lower outer frame 1505, the upper end of the filter screen 1503 is fixed between the upper outer frame 1501 and the upper inner frame 1502, the lower end of the filter screen 1503 is fixed between the lower inner frame 1504 and the lower outer frame 1505, the middle part of the filter screen 1503 is in a circular truncated cone shape, the lower part of the filter screen 1503 is in a hemispherical shape, a support ring body 17 is arranged on the outer side of the upper outer frame 1501, the support ring body 17 is arranged on the annular plate 3, a connector 1506 is arranged at the bottom of the lower outer frame 1505, and the connector 1506 is fixedly connected with the upper end of the liquid discharge pipe 8.

In this embodiment, the first liquid adding pipe 4 is used for adding a deacidification agent solution into the filter screen 1503 cylinder 15, the second liquid adding pipe 5 is used for adding a lithium hexafluorophosphate saturated solution into the filter screen 1503 cylinder 15, the freezing solution adopts frozen saline, the freezing solution is injected into the interlayer from the freezing solution inlet 6, and the lithium hexafluorophosphate saturated solution in the inner cylinder 2 is frozen to generate lithium hexafluorophosphate crystals.

In this embodiment, the stirring mechanism includes a vertical rotating shaft 13 and a helical blade 14 disposed on the rotating shaft 13, the upper end of the rotating shaft 13 is coaxially connected with an output shaft of a rotating motor 12 disposed in the middle of the top of the housing 1, and a plurality of through holes are uniformly disposed on the helical blade 14. The stirring mechanism improves the efficiency of deacidification washing.

Preferably, in order to further improve the efficiency of deacidification washing, this embodiment the filter screen 1503 is provided with a liquid distribution mechanism above the tube 15, the liquid distribution mechanism includes an annular liquid distribution pipe 9, the liquid distribution pipe 9 is communicated with the lower end of the first liquid adding pipe 4, the bottom of the liquid distribution pipe 9 is uniformly provided with a plurality of nozzles 10, the outside of the liquid distribution pipe 9 is fixedly connected with the inner wall of the top of the shell 1 through a plurality of connecting rods 11 symmetrically arranged, and the outer diameter of the liquid distribution pipe 9 is smaller than the inner diameter of the upper inner frame 1502.

An overflow pipe 20 is further arranged outside the shell 1, one end of the overflow pipe 20 is communicated with the upper portion of the inner barrel 2, the other end of the overflow pipe 20 is communicated with the liquid discharge pipe 8, and the situation that the liquid level in the inner barrel 2 is too high is avoided.

In this embodiment, the top of the shell is an arc surface, the bottom surface is circular, and the bottom of the shell is provided with a plurality of symmetrical support legs.

The utility model discloses a working principle and a using method of a lithium hexafluorophosphate deacidification and purification device, which comprises the following steps: injecting a refrigerating fluid into the interlayer from a refrigerating fluid inlet 6, adding a lithium hexafluorophosphate saturated solution into the filter screen 1503 cylinder 15 through a second liquid adding pipe 5, enabling the lithium hexafluorophosphate saturated solution to generate lithium hexafluorophosphate crystals in the inner cylinder 2 along with the temperature reduction, circulating the liquid in the inner cylinder 2 through a circulating pump 18 and a circulating pipe 19, so that the unfiltered crystal suspension outside the filter screen 1503 cylinder 15 is sent into the filter screen 1503 cylinder 15 for filtering, the crystals are left in the filter screen 1503 cylinder 15, opening a valve 21 to discharge a mother solution when the crystals are not increased any more after a period of time, and enabling the lithium hexafluorophosphate crystals to be left in the filter screen 1503 cylinder 15; adding deacidification agent solution into the filter screen 1503 cylinder 15 through the first liquid adding pipe 4 for deacidification washing, and discharging deacidification agent liquid through the liquid discharging pipe 8 after a period of deacidification treatment; the purified lithium hexafluorophosphate crystals deacidified in the cylinder 15 of the filter screen 1503 are discharged out of the device through a discharge pipe 16.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; based on the embodiments of the present invention, a person skilled in the art may modify the technical solutions described in the foregoing embodiments without creative efforts, or may substitute part of the technical features of the embodiments; however, such modifications and substitutions do not substantially depart from the spirit and scope of the present invention, and are intended to be included within the scope thereof.

Claims

1. The utility model provides a lithium hexafluorophosphate deacidification purification device, a serial communication port, including shell (1), inner tube (2), annular plate (3), leave the intermediate layer between inner tube (2) and shell (1), annular plate (3) outer fringe and shell (1) inner wall fixed connection, annular plate (3) inner edge and inner tube (2) top fixed connection, make the intermediate layer form the enclosed cavity, inner tube (2) lateral wall lower part is equipped with fluid-discharge tube (8) outside stretching out shell (1), inner tube (2) inside is equipped with filter screen (1503) section of thick bamboo (15), filter screen (1503) section of thick bamboo (15) inside is equipped with rabbling mechanism, filter screen (1503) section of thick bamboo (15) bottom is equipped with row's material pipe (16) that stretch out shell (1) bottom, shell (1) top is equipped with first liquid feeding pipe (4) that pour into fluid into filter screen (1503) section of thick bamboo (15), second liquid feeding pipe (5), shell (1) lateral wall still is equipped with refrigerating fluid entry (6) that communicate with the intermediate layer respectively, A refrigerating fluid outlet (7), a circulating pump (18), a circulating pipe (19) and a valve (21) are also connected to the liquid discharge pipe (8), the liquid outlet end of the circulating pipe (19) extends into the upper part of the filter screen (1503) barrel (15), and the liquid inlet end of the circulating pipe (19) is positioned between the circulating pump (18) and the valve (21).

2. The lithium hexafluorophosphate deacidification purification apparatus according to claim 1, wherein: filter screen (1503) section of thick bamboo (15) are including last frame (1501), go up inside casing (1502), filter screen (1503), inside casing (1504) down, frame (1505) down, go up frame (1501), fixed filter screen (1503) upper end between last inside casing (1502), frame (1504) down, fixed filter screen (1503) lower extreme between frame (1505) down, filter screen (1503) middle part is the round platform cylindric, filter screen (1503) lower part is the hemisphere, it is equipped with support ring body (17) to go up frame (1501) outside, support ring body (17) are installed on annular plate (3), frame (1505) bottom is equipped with interface (1506) down, interface (1506) and fluid-discharge tube (8) upper end fixed connection.

3. The lithium hexafluorophosphate deacidification purification apparatus according to claim 2, wherein: the liquid distribution mechanism is arranged above the filter screen (1503) barrel (15) and comprises an annular liquid distribution pipe (9), the liquid distribution pipe (9) is communicated with the lower end of the first liquid adding pipe (4), a plurality of nozzles (10) are uniformly arranged at the bottom of the liquid distribution pipe (9), and the outer side of the liquid distribution pipe (9) is fixedly connected with the inner wall of the top of the shell (1) through a plurality of connecting rods (11) which are symmetrically arranged.

4. The lithium hexafluorophosphate deacidification purification apparatus according to claim 3, wherein: the outer diameter of the liquid distribution pipe (9) is smaller than the inner diameter of the upper inner frame (1502).

5. The lithium hexafluorophosphate deacidification purification apparatus according to claim 1, wherein: the stirring mechanism comprises a vertical rotating shaft (13) and a spiral blade (14) arranged on the rotating shaft (13), and the upper end of the rotating shaft (13) is coaxially connected with an output shaft of a rotating motor (12) arranged in the middle of the top of the shell (1).

6. The lithium hexafluorophosphate deacidification purification apparatus according to claim 1, wherein: an overflow pipe (20) is further arranged outside the shell (1), one end of the overflow pipe (20) is communicated with the upper part of the inner barrel (2), and the other end of the overflow pipe (20) is communicated with the liquid discharge pipe (8).