CN219252230U

CN219252230U - Online continuous enrichment facility of ternary precursor of lithium electricity

Info

Publication number: CN219252230U
Application number: CN202223391655.5U
Authority: CN
Inventors: 肖利亚
Original assignee: Feature Tech Wuxi Filtration Technology Co ltd
Current assignee: Feature Tech Wuxi Filtration Technology Co ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-06-27
Anticipated expiration: 2032-12-16

Abstract

The utility model provides an online continuous concentration device for a ternary precursor of lithium battery, which comprises a reaction kettle, a ceramic membrane filter, a buffer tank and a clear liquid storage tank; the overflow port of the reaction kettle is connected with the filtrate inlet of the ceramic membrane filter, the concentrated phase outlet of the ceramic membrane filter is connected with the concentrated phase inlet of the reaction kettle, and the clear liquid outlet of the ceramic membrane filter is respectively connected with the clear liquid storage tank and the buffer tank. The on-line continuous concentration device for the ternary precursor of the lithium battery provided by the utility model has the advantages that the energy consumption is low, the occupied space is small, the ceramic membrane filter is adopted, ternary precursor particles in a material liquid phase can be separated with high precision, the particles are uniformly distributed and are not easy to harden, a concentrated phase can smoothly return to a reaction kettle for circular treatment, compressed gas or cleaning water can be used for back flushing and self-cleaning the ceramic membrane filter, manual operation is not needed, the service life is long, a stirrer is omitted, and the influence of shearing force on a crystal structure can be greatly weakened.

Description

Online continuous enrichment facility of ternary precursor of lithium electricity

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to an online continuous concentration device for a ternary precursor of a lithium battery.

Background

In recent decades, the market size of lithium batteries continues to grow and expand, and the positive electrode material of the lithium batteries is a decisive factor for the electrochemical performance of the lithium batteries, and influences the comprehensive performance of the lithium batteries. At present, commercial lithium battery anode materials mainly comprise lithium cobalt oxide, lithium iron phosphate, ternary materials nickel cobalt lithium manganate and the like, wherein the ternary anode materials are especially nickel cobalt lithium manganate NCM, and the ternary anode materials are high in energy density, good in cycle performance and long in service life. The most common method for preparing NCM ternary materials is a coprecipitation method, and precursor particles with uniform particle size distribution and moderate size are obtained. For the preparation of ternary precursors of batteries, a reaction kettle is one of key equipment for the production of lithium battery anode materials, after precursor particles are obtained from materials in the reaction kettle through a coprecipitation method, on-line continuous solid-liquid separation and concentration are needed through downstream filtering equipment, ternary precursor slurry with higher solid content is obtained through the reaction kettle after multiple times of concentration, and the ternary precursor slurry is sent to the rear for washing and drying.

At present, a PE sintering filter is adopted, the PE sintering filter comprises a plurality of PE sintering pipe filter cores, a built-in stirrer is used for preventing hardening, the volume of a reaction kettle is 6-10 m < 3 >, the diameter of basic equipment of the matched sintering filter is more than DN1800, and the volume is almost equal to that of the reaction kettle. The PE sinter tube concentrator suffers from several problems:

1) When the concentration of the ternary precursor is too high, the ternary precursor is easy to harden on the filter element and the lower part of the filter element, so that the particle distribution uniformity is affected, the ternary precursor is easy to harden in the thickener, and the ternary precursor cannot normally return to the reaction kettle;

2) The liquid holdup of the equipment is large, the volume of the equipment is almost equal to that of the reaction kettle, and the crystal growth speed of ternary precursor crystal particles is reduced to a certain extent;

3) The built-in stirrer of the equipment can cause breakage of crystals to a certain extent due to shearing force;

4) The energy consumption is high, and the occupied area is large;

5) The equipment needs to be soaked by acid washing regularly, and the manual maintenance operation is frequent.

In view of the foregoing, there is a need for an improved lithium-ion ternary precursor concentration device in the prior art to solve the above-mentioned problems.

Disclosure of Invention

The utility model aims to disclose an online continuous concentration device for a ternary precursor of a lithium battery, which has the advantages of low energy consumption and small occupied space, adopts a ceramic membrane filter, can separate ternary precursor particles in a material liquid phase with high precision, has uniform particle distribution and difficult hardening, enables a concentrated phase to smoothly return to a reaction kettle for circular treatment, enables compressed gas or cleaning water to perform back flushing and self cleaning on the ceramic membrane filter, does not need manual operation, has long service life, omits a stirrer, and can greatly weaken the influence of shearing force on a crystal structure.

In order to achieve the aim, the utility model provides an online continuous concentration device for a ternary precursor of lithium battery, which comprises a reaction kettle, a ceramic membrane filter, a buffer tank and a clear liquid storage tank; the overflow port of the reaction kettle is connected with the filtrate inlet of the ceramic membrane filter, the concentrated phase outlet of the ceramic membrane filter is connected with the concentrated phase inlet of the reaction kettle, and the clear liquid outlet of the ceramic membrane filter is respectively connected with the clear liquid storage tank and the buffer tank.

In some embodiments, a stirrer is disposed within the reaction vessel.

In some embodiments, a feed diaphragm pump and a feed valve are disposed between the reactor overflow and the ceramic membrane filter filtrate inlet.

In some embodiments, a regulating valve is arranged between the concentrated phase outlet of the ceramic membrane filter and the concentrated phase inlet of the reaction kettle.

In some embodiments, the ceramic membrane filter has a pressure transmitter and a temperature transmitter mounted thereon.

In some embodiments, a flow meter and a filtrate outlet valve are provided between the ceramic membrane filter clear liquid outlet and the clear liquid storage tank.

In some embodiments, the surge tank is connected with an air inlet valve and a cleaning liquid inlet valve.

In some embodiments, the ceramic membrane filter is a horizontal dynamic ceramic membrane filter.

Compared with the prior art, the utility model has the beneficial effects that: the on-line continuous concentration device for the ternary precursor of the lithium battery provided by the utility model has the advantages that the energy consumption is low, the occupied space is small, the ceramic membrane filter is adopted, ternary precursor particles in a material liquid phase can be separated with high precision, the particles are uniformly distributed and are not easy to harden, a concentrated phase can smoothly return to a reaction kettle for circular treatment, compressed gas or cleaning water can be used for back flushing and self-cleaning the ceramic membrane filter, manual operation is not needed, the service life is long, a stirrer is omitted, and the influence of shearing force on a crystal structure can be greatly weakened.

Drawings

Fig. 1 is a schematic structural diagram of an on-line continuous concentration device for lithium battery ternary precursors.

Detailed Description

The present utility model will be described in detail below with reference to the embodiments shown in the drawings, but it should be understood that the embodiments are not limited to the present utility model, and functional, method, or structural equivalents and alternatives according to the embodiments are within the scope of protection of the present utility model by those skilled in the art.

The on-line continuous concentration device for the ternary precursor of the lithium battery shown in fig. 1 comprises a reaction kettle 1, a ceramic membrane filter 6, a buffer tank 10 and a clear liquid storage tank 15. A stirrer 2 is arranged in the reaction kettle 1.

A ceramic membrane 7 is arranged in the ceramic membrane filter 6. The ceramic membrane filter 6 has low liquid holdup, the liquid holdup is less than 1/10 of the volume of the reaction kettle 1, and the crystal growth speed is not influenced. The ceramic membrane filter 6 is a horizontal dynamic ceramic membrane filter, and particles are prevented from accumulating on the surface of the ceramic membrane 7, so that the permeation flow is not blocked, a stirrer is omitted, the influence of shearing force on a crystal structure can be greatly weakened, and the energy consumption is low, which is about 1/3 of that of a PE sintered tube filter. The ceramic membrane filter 6 is provided with a pressure transmitter 8 and a temperature transmitter 9.

And the overflow port of the reaction kettle 1 is connected with the filtrate inlet of the ceramic membrane filter 6. A feeding diaphragm pump 4 and a feeding valve 5 are arranged between the overflow port of the reaction kettle 1 and the filtrate inlet of the ceramic membrane filter 6.

The dense phase outlet of the ceramic membrane filter 6 is connected with the dense phase inlet of the reaction kettle 1. And a regulating valve 3 is arranged between the dense phase outlet of the ceramic membrane filter 6 and the dense phase inlet of the reaction kettle 1.

The clear liquid outlet of the ceramic membrane filter 6 is respectively connected with a clear liquid storage tank 15 and a buffer tank 10. A flowmeter 13 and a filtrate outlet valve 14 are arranged between the clear liquid outlet of the ceramic membrane filter 6 and a clear liquid storage tank 15. The buffer tank 10 is connected with an air inlet valve 11 and a cleaning liquid inlet valve 12, and the buffer tank 10 is used for storing compressed air or cleaning water and is used for meeting the air-liquid phase backwashing amount during the regeneration of the ceramic membrane filter 6. After the device is used for a certain time, the compressed gas or the cleaning water in the buffer tank 10 is utilized to back flush and self-clean the ceramic membrane filter 6, so that the service life is long.

The pressure transmitter 8, the temperature transmitter 9 and the flowmeter 13 are adopted, in the operation process, pressure difference, temperature, flow and time signals can be detected in real time, and when the set pressure difference, temperature, flow and time are reached, the system automatically alarms, so that continuous and stable operation of equipment is effectively protected. The device is strong acid and alkali resistant, can be suitable for material treatment under the operating mode of different pH values, can directly wash in equipment with strong acid and alkali when necessary, need not to tear open the lid.

The material enters a ceramic membrane filter 6 from an overflow port of the reaction kettle 1 through a feeding diaphragm pump 4, ternary precursor particles in a liquid phase are separated by the ceramic membrane filter 6 with high precision, a concentrated phase containing the particles, which is concentrated by the ceramic membrane filter 6, returns to the reaction kettle 1 for further crystallization reaction, the concentration of solid phase concentration can reach more than 50%, and clear liquid enters a clear liquid storage tank 15 through a clear liquid outlet of the ceramic membrane filter 6.

The above list of detailed descriptions is only specific to practical embodiments of the present utility model, and they are not intended to limit the scope of the present utility model, and all equivalent embodiments or modifications that do not depart from the spirit of the present utility model should be included in the scope of the present utility model.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. The on-line continuous concentration device for the ternary precursor of the lithium battery is characterized by comprising a reaction kettle, a ceramic membrane filter, a buffer tank and a clear liquid storage tank; the overflow port of the reaction kettle is connected with the filtrate inlet of the ceramic membrane filter, the concentrated phase outlet of the ceramic membrane filter is connected with the concentrated phase inlet of the reaction kettle, and the clear liquid outlet of the ceramic membrane filter is respectively connected with the clear liquid storage tank and the buffer tank.

2. The lithium battery ternary precursor on-line continuous concentration device according to claim 1, wherein a stirrer is arranged in the reaction kettle.

3. The on-line continuous lithium-ion ternary precursor concentration device according to claim 1, wherein a feeding diaphragm pump and a feeding valve are arranged between the overflow port of the reaction kettle and the filtrate inlet of the ceramic membrane filter.

4. The on-line continuous lithium-ion ternary precursor concentration device according to claim 1, wherein a regulating valve is arranged between the concentrated phase outlet of the ceramic membrane filter and the concentrated phase inlet of the reaction kettle.

5. The lithium-ion ternary precursor on-line continuous concentration device according to claim 1, wherein a pressure transmitter and a temperature transmitter are installed on the ceramic membrane filter.

6. The lithium-ion ternary precursor on-line continuous concentration device according to claim 1, wherein a flowmeter and a filtrate outlet valve are arranged between the clear liquid outlet of the ceramic membrane filter and the clear liquid storage tank.

7. The lithium-ion ternary precursor on-line continuous concentration device according to claim 1, wherein the buffer tank is connected with an air inlet valve and a cleaning liquid inlet valve.

8. The lithium battery ternary precursor on-line continuous concentration device according to claim 1, wherein the ceramic membrane filter is a horizontal dynamic ceramic membrane filter.