CN218039413U

CN218039413U - Lithium battery slurry recycling and heat treatment system

Info

Publication number: CN218039413U
Application number: CN202221624495.1U
Authority: CN
Inventors: 徐治伟; 陈宁; 蔡东杰; 杨云广; 李长东
Original assignee: Pingnan Times New Materials Technology Co ltd; Hunan Brunp Recycling Technology Co Ltd; Guangdong Brunp Recycling Technology Co Ltd
Current assignee: Pingnan Times New Materials Technology Co ltd; Hunan Brunp Recycling Technology Co Ltd; Guangdong Brunp Recycling Technology Co Ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-12-13
Anticipated expiration: 2032-06-27

Abstract

The utility model discloses a lithium battery slurry recycling heat treatment system, which comprises a feeding bin, a metering bin, a screening device, an oversize material treatment group, a feeding device, a heat treatment device, a pretreatment group and a tail gas treatment group; weighing a certain amount of slurry powder in the metering bin, and then screening the slurry powder by using a screening device, so that tail gas generated in the heat treatment process is reduced, and the treatment pressure of a tail gas treatment group is reduced; a pretreatment group is arranged between the heat treatment device and the tail gas treatment group to realize solid-gas separation; and the screened block materials and foreign matters such as plastics and cloth strips are sorted, so that the loss of slurry powder is reduced.

Description

Lithium battery slurry recycling and heat treatment system

Technical Field

The utility model relates to a lithium cell retrieves technical field, in particular to lithium cell thick liquids recovery heat treatment system.

Background

Lithium ion batteries are widely used in various mobile devices due to their high energy density, high operating voltage, and long cycle life. It is mainly composed of positive electrode, negative electrode, diaphragm and electrolyte. In the preparation process of the anode, an anode active substance is uniformly mixed with a conductive agent and a bonding agent and then coated on an aluminum foil current collector to prepare the anode, wherein the commonly used anode active substances mainly comprise lithium cobaltate, nickel cobalt manganese lithium, lithium iron phosphate and the like. In the coating process, waste slurry is inevitably generated, if the waste slurry is not treated, the environment is seriously polluted, and the waste slurry generated in the coating process of the anode material contains precious metals, so that the anode material has great recovery value.

In the process of recovering the lithium ion battery slurry, the dried slurry powder needs to be subjected to heat treatment to remove foreign matters such as plastics and cloth strips, conductive agents, adhesives and the like in the slurry powder, so that relatively pure anode powder is obtained for subsequent leaching treatment. In the heat treatment process, if the heat treatment is directly performed on the dried slurry powder, a large amount of tail gas is generated, the treatment pressure of a tail gas treatment group is increased, the tail gas contains more micro powder, and the loss of the recycled anode powder is large.

SUMMERY OF THE UTILITY MODEL

The present invention aims to solve at least one of the above-mentioned technical problems in the related art to a certain extent. Therefore, the utility model provides a lithium battery slurry recycling heat treatment system.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

according to the utility model discloses a lithium battery slurry recovery heat treatment system technical scheme as follows, include:

the method comprises the following steps:

a charging bin for storing slurry powder;

the metering bin is connected with the discharge end of the feeding bin;

the screening device is connected with the discharge end of the metering bin;

the feed end of the oversize product treatment group is connected with the screening device;

the feeding device is connected with the discharge end of the screening device;

the heat treatment device is connected with the discharge end of the feeding device;

the pretreatment group is used for carrying out solid-gas separation on tail gas and is connected with the exhaust end of the heat treatment device;

and the tail gas treatment group is connected with the exhaust end of the pretreatment group.

According to the utility model discloses a lithium battery slurry recycling heat treatment system has following beneficial effect at least:

1. weighing a certain amount of slurry powder in the metering bin, and then screening the slurry powder by using a screening device to remove foreign matters such as plastics, cloth strips and the like contained in the slurry powder, so that tail gas generated in the heat treatment process is reduced, and the treatment pressure of a tail gas treatment group is reduced;

2. a pretreatment group is arranged between the heat treatment device and the tail gas treatment group to realize solid-gas separation, increase the product yield and reduce the risk of blocking pipelines and the tail gas treatment group by powder;

3. the screened block materials and foreign matters such as plastics and cloth strips are sorted, the foreign matters such as the block materials and the cloth strips are separated, the separated block materials are crushed and can be returned to the feeding bin for retreatment, and the loss of slurry powder is reduced.

Furthermore, a control valve is arranged between the screening device and the metering bin, and the feeding device and the control valve are controlled in an interlocking mode.

Further, the screening device is a direct discharge screen, the control valve is a double butterfly valve, and the feeding device is a double-spiral feeder.

Furthermore, the pretreatment group comprises a metal screen, a cyclone dust collector and a filtering device which are connected in sequence, wherein the air inlet end of the metal screen is connected with the feed end or the discharge end of the heat treatment device, and the material return end of the metal screen is communicated to the feed end of the heat treatment device.

Furthermore, the cyclone dust collector and the material returning end of the filtering device are connected with the feeding bin, and the filtering device is connected with the tail gas treatment group.

Further, the filtering device is a titanium rod filter or a bag-type dust collector.

Further, the tail gas treatment group comprises a fan;

the heat treatment device is a rotary kiln, a first temperature detector is arranged on the heat treatment device, and the fan and the first temperature detector are controlled in an interlocking manner;

and a second temperature detector or a pressure difference detector is arranged on the filtering device, and the fan is interlocked with the second temperature detector or the pressure difference detector.

Furthermore, the oversize material processing group comprises an air separator and a crusher which are sequentially connected, and the air separator is connected with the screening device.

Furthermore, the discharge end of the crusher is connected with the feeding bin.

Further, still include the cooling feed bin, the cooling feed bin with heat treatment device is connected.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of the structural connection of the present invention.

Reference numerals: a charging bin 100; a dosing bin 200; a control valve 210; a screening device 300; oversize treatment group 400; a winnowing machine 410; a crusher 420; a feeding device 500; a heat treatment device 600; a first temperature detector 610; a pre-treatment group 700; a metal mesh 710; a cyclone 720; a filter unit 730; a second temperature detector 731; an exhaust gas treatment group 800; a fan 810; the silo 900 is cooled.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1, the utility model relates to a lithium battery slurry recycling heat treatment system, including throwing feed bin 100, measurement storehouse 200, screening plant 300, oversize thing processing group 400, feeder 500, heat treatment device 600, preliminary treatment group 700 and tail gas processing group 800.

The feeding bin 100 is used for storing slurry powder, the slurry powder is dried by a preposed drying system, and the dried slurry powder contains foreign matters such as plastics and cloth strips. The feed end of the dosing bin 200 may be connected to the discharge end of the dosing bin 100 via a first pipe. The batch bin 100 delivers slurry powder into the metering bin 200. The metering bin 200 mainly controls the feeding amount of the slurry powder, and a weighing mechanism is arranged on the metering bin 200 and is used for weighing the slurry powder so as to control the discharging amount of the slurry powder.

The screening device 300 is connected with the discharge end of the metering bin 200 through a second material pipe, and the metering bin 200 conveys slurry powder to the screening device 300 in a quantitative mode. Can set up control valve 210 on the second material pipe that screening plant 300 and measurement storehouse 200 are connected, the preferred double butterfly valve that utilizes control valve 210 control unloading speed of control valve 210, cooperates measurement storehouse 200 control unloading volume simultaneously, prevents that the material unloading from causing screening plant 300's damage too fast, guarantees the effect of sieving. The screening device 300 is preferably a straight line screen for separating powder and lump materials, plastic cloth strips and other foreign matters in the slurry powder. After the slurry powder is screened, foreign matters are left on the screen, and the slurry powder is conveyed to the discharge end of the screening device 300.

The feeding end of the feeding device 500 is connected with the discharging end of the screening device 300 through a third material pipe, and the slurry powder is conveyed into the feeding device 500. Wherein the feeding device 500 is preferably a double-screw feeder, and the feeding device 500 is controlled in an interlocking manner with the control valve 210 to control the feeding speed of the feeding device 500.

The feed end of the oversize material processing group 400 is connected with the screening device 300, and the oversize material processing group 400 is used for processing the foreign materials screened in the screening device 300. Specifically, the oversize product processing group 400 includes an air classifier 410 and a crusher 420 connected in series. The winnowing machine 410 is connected with the oversize part of the screening device 300 through a fourth material pipe, foreign matters enter the winnowing machine 410, the winnowing machine 410 separates out the blocks in the foreign matters, and then the blocks are conveyed into the crusher 420 for crushing. Wherein, the crushed materials can be collected and then put into the feeding bin 100 again for reprocessing. Alternatively, the discharge end of the crusher 420 may be connected to the batch bin 100 through a first return pipe. After the blocks are crushed, the blocks are directly reversely fed into the feeding bin 100 through the first return pipe and are mixed with the slurry powder for treatment again.

The discharge end of the feeding device 500 is connected to the heat treatment device 600 through a discharge pipe. The heat treatment apparatus 600 is preferably a rotary kiln. The slurry powder sieved by the sieving device 300 enters the heat treatment device 600 through the feeding device 500 for heat treatment. The control valve 210 and the feeding device 500 are interlocked to control the blanking speed and the blanking amount, and can also avoid the oxidation and decomposition of products and high discharging temperature caused by the sudden temperature rise due to the too fast feeding of the heat treatment device 600. After the slurry powder is screened by the screening device 300, the heat treatment effect can be improved, and the generation of tail gas in the heat treatment process can be reduced. The heat treatment apparatus 600 is provided with a first temperature detector 610, and the first temperature detector 610 is configured to detect a temperature of the exhaust gas generated by the heat treatment apparatus 600. The control valve 210 is used for controlling the blanking speed and the blanking amount, so that damage to the screening device 300 caused by too fast material blanking is prevented, the screening effect of the screening device 300 is ensured, and the phenomenon that the temperature rises suddenly due to too fast feeding of the heat treatment device 600, so that oxidation, decomposition and high discharging temperature of products are prevented; in addition, the feeding speed of the powder can be controlled by matching with the feeding device 500, so that the powder can uniformly enter the heat treatment device 600.

The pretreatment module 700 is connected to the exhaust end of the heat treatment apparatus 600 through a first exhaust pipe. The tail gas generated by the heat treatment device 600 is conveyed to the pretreatment unit 700 through the first exhaust pipe to be subjected to solid-gas separation, and dust contained in the tail gas is separated. Specifically, the pretreatment unit 700 includes a metal mesh 710, a cyclone 720, and a filtering device 730 connected in sequence, and the metal mesh 710 is connected to the heat treatment device 600. The metal mesh 710 may be connected to the feeding end of the heat treatment apparatus 600 through a second exhaust pipe, or the metal mesh 710 may be connected to the discharging end of the heat treatment apparatus 600 through a second exhaust pipe. The exhaust gas generated from the heat treatment apparatus 600 is delivered into the metal mesh 710 through the first gas pipe. The metal mesh 710 intercepts dust contained in the tail gas to realize solid-gas separation. The tail gas obtained by separating the metal screen 710 enters the cyclone 720 through the third exhaust pipe, the intercepted dust is connected to the feed end of the heat treatment device 600 through the second return pipe, and the dust enters the heat treatment device 600 for heat treatment again, so that the recovery rate of the product is improved. The tail gas is further subjected to solid-gas separation in the cyclone 720, dust in the tail gas is intercepted, and the dust content in the tail gas is reduced, so that the risk of pipeline blockage by the dust is reduced. The filtering device 730 is connected to the exhaust end of the cyclone 720 through a fourth exhaust pipe. The off-gas passes from the cyclone 720 to a filter 730, the filter 730 preferably being a titanium rod filter or a cloth bag dust collector. Micro powder in the tail gas is further intercepted through the filtering device 730, and the subsequent tail gas treatment group 800 is prevented from being blocked by the micro powder. Preferably, a second temperature detector 731 or a pressure difference detector (not shown) is disposed on the filter device 730 to detect the temperature or the pressure difference inside the filter device. Wherein, the dust separated from the cyclone 720 and the filter 730 can be collected and put into the feeding bin 100 for reprocessing. Specifically, the cyclone 720 and the filtering device 730 are both connected to the feeding bin 100 through the third connection, and the dust separated from the tail gas in the cyclone 720 and the filtering device 730 is conveyed into the feeding bin 100 through the third return pipe for reprocessing, so that the product loss is further reduced, and the product recovery rate is improved.

The exhaust gas treatment group 800 is connected to the exhaust end of the pretreatment group 700, and the exhaust gas treatment group 800 can perform physical treatment, such as temperature reduction, or chemical treatment, such as neutralization reaction, on the exhaust gas treated by the pretreatment group 700, so that the exhaust gas reaches the emission standard. The tail gas treatment group 800 comprises a fan 810, the fan 810 and the first temperature detector 610 are controlled in an interlocking manner, and the air volume of the fan 810 is controlled through the tail gas temperature detected by the first temperature detector 610; in addition, the fan 810 is also interlocked with the second temperature detector 731 or the pressure difference detector for better controlling the air volume of the fan 810.

Further, the discharge end of the heat treatment device 600 is connected with a cooling bin 900 to cool the product obtained by the heat treatment device 600, so as to ensure the normal operation of the subsequent packaging process.

The utility model discloses lithium battery slurry retrieves heat treatment system effectively reduces the tail gas that produces among the heat treatment process, reduces the processing pressure of tail gas treatment group 800 to improve the yield of product, reduce the material loss.

Reference throughout this specification to specific features, structures, materials, or characteristics described in connection with the embodiment or example are intended to be included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A lithium battery slurry recycling heat treatment system is characterized by comprising:

a charging bin (100), wherein the charging bin (100) is used for storing slurry powder;

the metering bin (200), the metering bin (200) is connected with the discharge end of the charging bin (100);

the screening device (300), the screening device (300) is connected with the discharge end of the metering bin (200);

an oversize treatment group (400), the feed end of the oversize treatment group (400) being connected to the screening device (300);

a feeding device (500), wherein the feeding device (500) is connected with the discharge end of the screening device (300);

a heat treatment device (600), the heat treatment device (600) being connected to the discharge end of the feeding device (500);

the pretreatment group (700) is used for carrying out solid-gas separation on tail gas, and the pretreatment group (700) is connected with the exhaust end of the heat treatment device (600);

a tail gas treatment group (800), the tail gas treatment group (800) being connected with the exhaust end of the pretreatment group (700).

2. The lithium battery slurry recovery heat treatment system according to claim 1, characterized in that: a control valve (210) is arranged between the screening device (300) and the metering bin (200), and the feeding device (500) and the control valve (210) are controlled in an interlocking mode.

3. The lithium battery slurry recovery heat treatment system according to claim 2, characterized in that: the screening device (300) is a direct-discharge screen, the control valve (210) is a double butterfly valve, and the feeding device (500) is a double-spiral feeder.

4. The lithium battery slurry recovery heat treatment system according to claim 1, characterized in that: the pretreatment group (700) comprises a metal screen (710), a cyclone dust collector (720) and a filtering device (730) which are connected in sequence, wherein the air inlet end of the metal screen (710) is connected with the feed end or the discharge end of the heat treatment device (600), and the material return end of the metal screen (710) is communicated to the feed end of the heat treatment device (600).

5. The lithium battery slurry recycling heat treatment system according to claim 4, characterized in that: the material returning ends of the cyclone dust collector (720) and the filtering device (730) are connected with the feeding bin (100), and the filtering device (730) is connected with the tail gas treatment group (800).

6. The lithium battery slurry recycling heat treatment system according to claim 4, characterized in that: the filtering device (730) is a titanium rod filter or a bag-type dust collector.

7. The lithium battery slurry recycling heat treatment system according to claim 4, characterized in that: the tail gas treatment group (800) comprises a fan (810);

the heat treatment device (600) is a rotary kiln, a first temperature detector (610) is arranged on the heat treatment device (600), and the fan (810) and the first temperature detector (610) are controlled in an interlocking manner;

and a second temperature detector (731) or a pressure difference detector is arranged on the filtering device (730), and the fan (810) is in interlocking control with the second temperature detector (731) or the pressure difference detector.

8. The lithium battery slurry recovery heat treatment system according to claim 1, characterized in that: the oversize material processing group (400) comprises an air separator (410) and a crusher (420) which are sequentially connected, and the air separator (410) is connected with the screening device (300).

9. The lithium battery slurry recovery heat treatment system according to claim 8, wherein: the discharge end of the crusher (420) is connected with the charging bin (100).

10. The lithium battery slurry recovery heat treatment system according to claim 1, characterized in that: the device further comprises a cooling bin (900), and the cooling bin (900) is connected with the heat treatment device (600).