Recovery equipment for Li in lithium ion battery ternary positive electrode material sintering waste gas

Abstract

The utility model provides recovery equipment for Li in lithium ion battery ternary positive electrode material sintering waste gas, and relates to the technical field of waste gas recovery in the battery material preparation process. The recycling equipment comprises a sintering device and a waste gas collecting device, the sintering device is provided with a first waste gas outlet, the waste gas collecting device is provided with a first waste gas inlet and a second waste gas outlet, and an acid liquor ejector is arranged in the waste gas collecting device; the first waste gas outlet is connected with the first waste gas inlet, so that Li-containing first waste gas introduced into the waste gas collecting device is in contact with acid liquor, and Li in the waste gas is dissolved; and the second waste gas outlet is used for discharging Li-free second waste gas. The recovery equipment is simple in structure, not only can solve the problem that the lithium salt volatilized in the ternary positive electrode material sintering process crystallizes in an exhaust system, corrodes and blocks an exhaust pipeline, but also can recover the volatilized lithium salt.

Description

Technical Field

[0001] This utility model relates to the field of waste gas recovery technology in the battery material preparation process, specifically, to a device for recovering Li from the sintering waste gas of ternary cathode materials for lithium-ion batteries. Background Technology

[0002] When the cathode material of ternary lithium-ion batteries is sintered under negative pressure in sintering equipment (such as roller kiln), the lithium salt on the surface of the material is prone to volatilization and is discharged from the kiln through the exhaust pipe along with the exhaust gas.

[0003] When exhaust gas containing volatile lithium salts enters the flue gas duct, the temperature drops, causing the lithium salts to condense and crystallize, adhering to the inner wall of the duct and clogging and corroding it. As the lithium salts continue to crystallize and corrode the duct, the inner diameter of the flue gas duct gradually decreases, leading to a reduction in the exhaust volume of the kiln exhaust system and affecting the sintering effect of the ternary cathode material. Furthermore, the continuous volatilization of lithium salts with the exhaust gas significantly increases the waste of lithium salt resources.

[0004] In view of this, this utility model is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a device for recovering Li from the sintering waste gas of ternary cathode materials for lithium-ion batteries, so as to solve or improve the above-mentioned technical problems.

[0006] This utility model can be implemented as follows:

[0007] This utility model provides a device for recovering Li from the sintering waste gas of ternary cathode material for lithium-ion batteries, including a sintering device and a waste gas collection device.

[0008] The sintering device has a first waste gas outlet, and the waste gas collection device has a first waste gas inlet and a second waste gas outlet. The waste gas collection device is equipped with an acid injector. The first waste gas outlet is connected to the first waste gas inlet so that the first waste gas containing Li entering the waste gas collection device comes into contact with the acid, thereby dissolving the Li in the waste gas. The second waste gas outlet is used to discharge the second waste gas that does not contain Li.

[0009] In an optional embodiment, the recovery device further includes a first exhaust pipe, one end of which is connected to a first exhaust outlet, and the other end of which passes through a first exhaust inlet and extends into the lower part of the exhaust collection device.

[0010] In an optional embodiment, a first valve is provided in the area of ​​the first exhaust pipe between the first exhaust outlet and the first exhaust inlet.

[0011] In an optional embodiment, the exhaust gas collection device includes a housing and a collection chamber formed by the housing;

[0012] The acid injector is located on the bottom inner wall of the housing.

[0013] In an optional embodiment, the acid injector has a rotary nozzle.

[0014] In an optional embodiment, the shell is a sandwich shell, and the shell is provided with a refrigerant inlet and a refrigerant outlet, and the sandwich cavity of the sandwich shell is used for refrigerant flow.

[0015] In an optional implementation, a second valve and a third valve are provided at the refrigerant inlet and refrigerant outlet, respectively.

[0016] In an optional embodiment, the exhaust gas collection device further includes a thermocouple for measuring the temperature inside the collection chamber.

[0017] In an optional embodiment, the recovery equipment further includes a neutralization device, and the second exhaust gas outlet is connected to the neutralization device via a second exhaust pipe to neutralize the acid in the second exhaust gas.

[0018] In an optional embodiment, the recovery device further includes an exhaust fan connected to the neutralization device via a third exhaust duct, the third exhaust duct being equipped with a baffle plate for controlling exhaust efficiency.

[0019] The beneficial effects of this utility model include:

[0020] The Li recovery device for sintering waste gas of ternary cathode material of lithium-ion battery provided by this utility model can dissolve Li in the first waste gas introduced into the waste gas collection device by setting up a waste gas collection device with an acid injector. This helps to solve the problem that the lithium salt volatilized during the sintering process of ternary cathode material crystallizes, corrodes and blocks the exhaust pipe in the exhaust system. Moreover, it can also recover the volatilized lithium salt, alleviate resource shortages and avoid environmental pollution. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the Li recovery equipment in the sintering waste gas of the ternary cathode material of lithium-ion battery provided in this embodiment.

[0023] Icons: 11-First exhaust gas outlet; 21-First exhaust gas inlet; 22-Second exhaust gas outlet; 23-Acid injector; 24-Shell; 25-Collection chamber; 26-Interlayer cavity; 31-First exhaust pipe; 32-Second exhaust pipe; 33-Third exhaust pipe; 41-First valve; 42-Second valve; 43-Third valve; 44-Fourth valve; 50-Thermocouple; 60-Neutralization device; 70-Exhaust fan; 80-Insulator plate. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product of this utility model is in use. These are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, the use of terms such as "horizontal" or "vertical" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Example

[0031] This embodiment provides a device for recovering Li from the sintering waste gas of ternary cathode materials for lithium-ion batteries, including a sintering device and a waste gas collection device.

[0032] The sintering device is a roller kiln.

[0033] like Figure 1 As shown, the sintering apparatus has a first waste gas outlet 11, and the first waste gas is Li-containing waste gas generated during the sintering process.

[0034] The exhaust gas collection device has a first exhaust gas inlet 21 and a second exhaust gas outlet 22, and an acid injector 23 is installed inside the exhaust gas collection device.

[0035] The first exhaust gas outlet 11 is connected to the first exhaust gas inlet 21 so that the first exhaust gas containing Li entering the exhaust gas collection device comes into contact with an acid (such as dilute hydrochloric acid) to dissolve the Li in the exhaust gas; the second exhaust gas outlet 22 is used to discharge the second exhaust gas that does not contain Li.

[0036] This can be understood as follows: the first waste gas entering the waste gas collection device dissolves Li through acid, and the remaining waste gas is the second waste gas that does not contain Li.

[0037] Furthermore, the above-mentioned recycling equipment also includes a first exhaust pipe 31, one end of which is connected to the first exhaust outlet 11, and the other end of which passes through the first exhaust inlet 21 and extends into the lower part of the exhaust gas collection device.

[0038] Preferably, the position of the first exhaust pipe 31 extending into the exhaust gas collection device allows the acid sprayed by the acid injector 23 to fully dissolve the Li in the first exhaust gas.

[0039] In some alternative embodiments, the acid injector 23 has a fixed nozzle; in other alternative embodiments, the acid injector 23 has a rotary nozzle to better dissolve Li in the first waste gas introduced into the waste gas collection device.

[0040] In some alternative embodiments, a first valve 41 is provided in the region of the first exhaust duct 31 between the first exhaust outlet 11 and the first exhaust inlet 21, thereby controlling the amount of first exhaust gas emitted.

[0041] For example, the first valve 41 described above can be a butterfly valve.

[0042] In some alternative implementations, a hydrochloric acid anti-fogging agent may be added to the dilute hydrochloric acid to reduce its volatilization.

[0043] In some alternative embodiments, the exhaust gas collection device includes a housing 24 and a collection chamber 25 formed by the housing 24.

[0044] The acid injector 23 is preferably disposed on the bottom inner wall of the housing 24. However, it is not excluded that it may be disposed at other locations on the inner wall of the housing 24 as needed.

[0045] In some preferred embodiments, the housing 24 is a sandwiched housing, which has a refrigerant inlet and a refrigerant outlet, and the sandwiched cavity 26 of the sandwiched housing is used for refrigerant flow and circulation.

[0046] The refrigerant inlet can be located in the lower middle part of the sandwich shell, and the refrigerant outlet can be located in the upper middle part of the sandwich shell. The refrigerant can, for example, be cooling water.

[0047] Through the aforementioned refrigerant action, lithium-containing compounds in the first waste gas can be cooled and enriched, and then collected after acid flushing.

[0048] The refrigerant inlet and refrigerant outlet can be equipped with a second valve 42 and a third valve 43, respectively, to control the refrigerant flow.

[0049] In addition, the housing 24 may be provided with an acid outlet, and a fourth valve 44 for controlling the acid outflow rate may be provided at the acid outlet.

[0050] Furthermore, the aforementioned waste gas collection device may also include a thermocouple 50 for measuring the temperature inside the collection chamber 25.

[0051] By setting up a temperature-measuring thermocouple 50, the temperature inside the housing 24 can be monitored in real time, which can then guide the control of refrigerant flow rate and velocity to improve the cooling rate of lithium-containing compounds.

[0052] Furthermore, the above-mentioned recycling equipment may also include a neutralization device 60, and the second waste gas outlet 22 is connected to the neutralization device 60 through the second exhaust pipe 32 to neutralize the acid in the second waste gas.

[0053] The neutralization device 60 can be a container filled with saturated sodium carbonate for neutralizing acids (such as hydrochloric acid) in the second waste gas.

[0054] Furthermore, the aforementioned recycling equipment may also include an exhaust fan 70, which is connected to the neutralization device 60 via a third exhaust pipe 33, and the third exhaust pipe 33 is equipped with a baffle plate 80 that can control the exhaust efficiency.

[0055] Continuing from the above, the working principle of the Li recovery device in the sintering waste gas of lithium-ion battery ternary cathode material provided by this utility model includes:

[0056] The lithium-containing waste gas (first waste gas) generated during the sintering of ternary cathode materials is discharged from the sintering device (roller kiln) through the first exhaust pipe 31, powered by the exhaust fan 70.

[0057] By adding a waste gas collection device between the sintering device and the exhaust fan 70, the first waste gas can be cooled by the circulating cooling water in the housing 24 of the waste gas collection device, and acid (dilute hydrochloric acid) can be sprayed from the lower inner wall of the housing 24 of the waste gas collection device. After the first waste gas enters the waste gas collection system, the lithium-containing compounds are rapidly cooled and condensed under the action of the cooling water, and are washed and recovered by the acid sprayed by the rotatable acid sprayer 23.

[0058] Uncondensed lithium compounds dissolve directly in the acid upon contact, achieving Li enrichment. After Li is removed from the first waste gas, a second waste gas free of Li is formed. This waste gas continues to be discharged from the waste gas collection device through the second waste gas outlet 22 under the power of the exhaust fan 70.

[0059] The second exhaust gas from the exhaust gas collection device enters the neutralization device 60 containing a saturated sodium carbonate solution through the second exhaust pipe 32 to neutralize the hydrochloric acid component carried by the second exhaust gas.

[0060] After neutralization, the exhaust is discharged through the third exhaust pipe 33, which is equipped with an adjustable exhaust efficiency plate 80, and then discharged by the exhaust fan 70.

[0061] In summary, the lithium recovery equipment in the sintering exhaust gas of the ternary cathode material of lithium-ion batteries provided by this utility model can accelerate the reduction of exhaust gas temperature and the condensation rate of lithium-containing compounds by adding an exhaust gas collection device with a cooling effect between the sintering device and the exhaust fan 70. The exhaust gas collection device is equipped with an acid injector 23. After the first exhaust gas comes into contact with the acid, the lithium-containing compounds are collected by the acid. The condensed lithium-containing compound crystals can also be washed and recovered by the acid, thereby effectively recovering the lithium element in the first exhaust gas and reducing the blockage and corrosion of the corresponding pipes of the exhaust fan.

[0062] The aforementioned recycling equipment can not only solve the problem of lithium salts volatilized during the sintering process of ternary cathode materials crystallizing, corroding, and clogging exhaust pipes in the exhaust system, but also recover the volatilized lithium salts, alleviate resource shortages, and avoid environmental pollution.

[0063] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A device for recovering Li from sintering waste gas of ternary cathode materials for lithium-ion batteries, characterized in that, This includes sintering equipment and waste gas collection equipment; The sintering apparatus has a first waste gas outlet, and the waste gas collection device has a first waste gas inlet and a second waste gas outlet. The waste gas collection device is equipped with an acid injector. The first waste gas outlet is connected to the first waste gas inlet so that the first waste gas containing Li entering the waste gas collection device comes into contact with the acid, thereby dissolving the Li in the waste gas. The second waste gas outlet is used to discharge the second waste gas that does not contain Li.

2. The recycling equipment according to claim 1, characterized in that, The recycling device also includes a first exhaust pipe, one end of which is connected to the first exhaust outlet, and the other end of which passes through the first exhaust inlet and extends into the lower part of the exhaust collection device.

3. The recycling equipment according to claim 2, characterized in that, The first exhaust pipe is provided with a first valve in the area between the first exhaust outlet and the first exhaust inlet.

4. The recycling equipment according to claim 2, characterized in that, The waste gas collection device includes a housing and a collection chamber formed by the housing; The acid injector is located on the bottom inner wall of the housing.

5. The recycling equipment according to claim 4, characterized in that, The acid injector has a rotary nozzle.

6. The recycling equipment according to claim 4, characterized in that, The shell is a sandwich shell, and the shell is provided with a refrigerant inlet and a refrigerant outlet. The sandwich cavity of the sandwich shell is used for refrigerant flow.

7. The recycling equipment according to claim 6, characterized in that, The refrigerant inlet and the refrigerant outlet are respectively equipped with a second valve and a third valve.

8. The recycling equipment according to claim 4, characterized in that, The waste gas collection device also includes a thermocouple for measuring the temperature inside the collection chamber.

9. The recycling equipment according to claim 1, characterized in that, The recycling equipment also includes a neutralization device, and the second waste gas outlet is connected to the neutralization device through a second exhaust pipe to neutralize the acid in the second waste gas.

10. The recycling equipment according to claim 9, characterized in that, The recycling equipment also includes an exhaust fan, which is connected to the neutralization device via a third exhaust pipe, and the third exhaust pipe is equipped with a baffle plate that can control the exhaust efficiency.

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