Device for leaching lithium element in lithium iron phosphate recovery powder

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By setting up multiple hydrogen peroxide input pipes and stirring paddles arranged in the reactor at equal intervals and arranged in the height, the problem of uneven hydrogen peroxide addition during the recovery process of lithium iron phosphate batteries is solved, and the uniformity of the reaction and cost savings are achieved.

CN223288079UActive Publication Date: 2025-09-02SHENZHEN JIECHENG NICKEL COBALT NEW ENERGY TECH CO LTD

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Patent Information

Application Number: CN202422580215.7
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-10-23
Publication Date: 2025-09-02
Estimated Expiration: 2034-10-23

AI Technical Summary

Technical Problem

During the wet recovery process of lithium iron phosphate batteries, the addition method of hydrogen peroxide in the prior art leads to uneven reactions, and the problem of excessive local concentrations is prone to occur.

Method used

A number of hydrogen peroxide input pipes arranged at equal intervals and in a staircase are set in the reactor, and a stirring paddle is equipped with a stirring paddle. The stirring paddle is driven by a stirring motor to ensure the uniform distribution of hydrogen peroxide.

Benefits of technology

The uniformity of hydrogen peroxide is improved, the uniformity of reaction is promoted, the decomposition loss of hydrogen peroxide is reduced, and the production cost is reduced.

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Abstract

The utility model discloses a device for leaching lithium element in lithium iron phosphate recovery powder, which relates to the technical field of lithium battery recovery, and comprises a reaction kettle and a hydrogen peroxide storage tank independently arranged outside the reaction kettle, and the hydrogen peroxide storage tank is connected with the reaction kettle through a hydrogen peroxide conveying main pipe; a plurality of hydrogen peroxide input pipes are vertically arranged in the reaction kettle, the hydrogen peroxide input pipes are distributed along the inner circumferential surface of the reaction kettle at equal intervals, liquid outlets of the hydrogen peroxide input pipes are arranged in an echelon manner according to the height, and liquid inlets of the hydrogen peroxide input pipes are connected with a hydrogen peroxide conveying main pipe; a stirring motor is arranged at the top of the reaction kettle, a stirring paddle is arranged in the reaction kettle, the output end of the stirring motor is fixedly connected with the stirring paddle, and the stirring paddle is located among the hydrogen peroxide input pipes. The hydrogen peroxide adding device can effectively improve the adding uniformity of hydrogen peroxide, avoid over-high local hydrogen peroxide concentration and facilitate uniform reaction.

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Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery recycling, in particular to a device for leaching lithium elements in lithium iron phosphate recovery powder. Background Art

[0002] At present, in the wet recycling process of lithium iron phosphate batteries, the leaching link is one of the key points.

[0003] During the leaching process, hydrogen peroxide is typically added to the lithium iron phosphate recovery powder slurry in the leaching unit to oxidize ferrous iron to ferric iron, thereby forming an iron phosphate precipitate that is easily filtered and removed for iron removal. To improve hydrogen peroxide utilization, the leaching unit typically uses a pipe that extends deep into the lithium iron phosphate recovery powder slurry to add hydrogen peroxide. However, this addition method can easily lead to excessively high hydrogen peroxide concentrations in certain areas, resulting in an uneven reaction. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the existing technology. The utility model provides a device for leaching lithium iron phosphate to recover lithium elements in powder. By arranging multiple hydrogen peroxide inlet pipes at equal intervals and arranged in a height ladder in a reactor and surrounding a stirring paddle, the uniformity of hydrogen peroxide addition can be effectively improved, the local excessive hydrogen peroxide concentration can be avoided, and the reaction is conducive to uniform progress.

[0005] The utility model provides a device for leaching lithium iron phosphate to recover lithium elements in powder, the device comprising a reactor and a hydrogen peroxide storage tank independently arranged outside the reactor, the hydrogen peroxide storage tank being connected to the reactor via a hydrogen peroxide delivery main pipe;

[0006] A plurality of hydrogen peroxide inlet pipes are vertically arranged inside the reactor. The plurality of hydrogen peroxide inlet pipes are evenly spaced along the inner circumference of the reactor. The liquid outlets of the plurality of hydrogen peroxide inlet pipes are arranged in a stepped manner in height. The liquid inlets of the plurality of hydrogen peroxide inlet pipes are all connected to the hydrogen peroxide delivery main pipe.

[0007] A stirring motor is provided on the top of the reactor, and a stirring paddle is provided inside the reactor. The output end of the stirring motor is fixedly connected to the stirring paddle, and the stirring paddle is located in the middle of the multiple hydrogen peroxide input pipes.

[0008] Specifically, a main feed port is provided at the top of the reactor, and a main discharge port is provided at the bottom of the reactor.

[0009] Specifically, the main discharge port is connected to a filter press.

[0010] Specifically, the liquid inlet of any hydrogen peroxide inlet pipe among the plurality of hydrogen peroxide inlet pipes is connected to the hydrogen peroxide delivery main pipe via a hydrogen peroxide delivery secondary pipe.

[0011] Specifically, a liquid inlet of any of the multiple hydrogen peroxide inlet pipes is connected to a check valve, and the check valve is located on the corresponding hydrogen peroxide delivery secondary pipe.

[0012] Specifically, the liquid inlet of any of the multiple hydrogen peroxide inlet pipes is connected to a water pump, and the water pump is located on the corresponding hydrogen peroxide delivery secondary pipe.

[0013] Specifically, eight hydrogen peroxide inlet pipes are vertically arranged inside the reactor.

[0014] Specifically, the height difference between the liquid outlets of two adjacent hydrogen peroxide inlet pipes in the vertical direction is at least greater than 10 cm.

[0015] Specifically, the liquid inlets of the multiple hydrogen peroxide input pipes are all located at the same horizontal height.

[0016] Specifically, a first tank liquid inlet is provided on the top of the hydrogen peroxide storage tank, a second tank liquid inlet is provided on the upper side of the circumference of the hydrogen peroxide storage tank, and a tank liquid outlet is provided at the bottom of the hydrogen peroxide storage tank, and the tank liquid outlet is connected to the hydrogen peroxide delivery main pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] In the device for leaching lithium iron phosphate and recovering lithium from powder of the present invention, a plurality of hydrogen peroxide inlet pipes are arranged at equal intervals along the inner circumference of the reactor, and the liquid outlets of the plurality of hydrogen peroxide inlet pipes are arranged in a stepped manner in height and surround the stirring paddle. This effectively improves the uniformity of hydrogen peroxide addition and promotes rapid and uniform dispersion of hydrogen peroxide, thereby avoiding excessively high local hydrogen peroxide concentration and facilitating uniform reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a side structural diagram of a device for leaching lithium iron phosphate to recover lithium elements from powder in an embodiment of the present utility model;

[0021] Figure 2 It is a schematic diagram of the bottom structure of the device for leaching lithium iron phosphate to recover lithium elements in powder in an embodiment of the present utility model.

[0022] In the accompanying drawings, 100, reactor; 110, hydrogen peroxide inlet pipe; 120, stirring motor; 130, stirring paddle; 140, main feed inlet; 150, main discharge port; 160, hydrogen peroxide delivery secondary pipe; 161, check valve; 162, water pump; 200, hydrogen peroxide storage tank; 210, hydrogen peroxide delivery main pipe; 220, first storage tank liquid inlet; 230, second storage tank liquid inlet; 240, storage tank liquid outlet. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] The utility model provides a device for leaching lithium iron phosphate to recover lithium elements in powder. Figure 1 The side structure diagram of the device for leaching lithium iron phosphate to recover lithium element in the powder according to the embodiment of the utility model is shown. Figure 2 The bottom structure schematic diagram of the device for leaching lithium iron phosphate recovery powder in an embodiment of the present invention is shown. The device includes a reactor 100 and a hydrogen peroxide storage tank 200 independently arranged outside the reactor 100. The hydrogen peroxide storage tank 200 is connected to the reactor 100 via a hydrogen peroxide delivery pipe 210; a plurality of hydrogen peroxide inlet pipes 110 are vertically arranged inside the reactor 100. The plurality of hydrogen peroxide inlet pipes 110 are evenly spaced along the inner circumference of the reactor 100. The liquid outlets of the plurality of hydrogen peroxide inlet pipes 110 are arranged in a stepped manner in height, and the liquid inlets of the plurality of hydrogen peroxide inlet pipes 110 are all connected to the hydrogen peroxide delivery pipe 210; a stirring motor 120 is provided on the top of the reactor 100, and a stirring paddle 130 is provided inside the reactor 100. The output end of the stirring motor 120 is fixedly connected to the stirring paddle 130, and the stirring paddle 130 is located in the middle of the plurality of hydrogen peroxide inlet pipes 110.

[0025] In the present invention, multiple hydrogen peroxide inlet pipes 110 are evenly spaced along the inner circumference of the reactor 100. Furthermore, the liquid outlets of the multiple hydrogen peroxide inlet pipes 110 are arranged in a stepped manner and surround the stirring paddle 130. This effectively improves the uniformity of hydrogen peroxide addition and promotes rapid and uniform dispersion of hydrogen peroxide, thereby avoiding excessively high local concentrations of hydrogen peroxide and promoting a uniform reaction.

[0026] Moreover, the presence of multiple hydrogen peroxide inlet pipes 110 can play a role in flow disturbance, further promoting the rapid and uniform dispersion of hydrogen peroxide, and is also conducive to the uniform reaction, thereby improving the reaction efficiency.

[0027] In addition, multiple hydrogen peroxide inlet pipes 110 can add hydrogen peroxide simultaneously, which increases the unit input amount of hydrogen peroxide and improves the contact efficiency between hydrogen peroxide and the materials in the reactor 100, thereby improving the oxidation efficiency of hydrogen peroxide. This can effectively reduce the decomposition loss of hydrogen peroxide, thereby reducing the amount of hydrogen peroxide used in the oxidation process, thereby saving production costs.

[0028] In some specific embodiments, see Figure 1 The top of the reactor 100 is provided with a main feed port 140 for inputting lithium iron phosphate recovery powder slurry; the bottom of the reactor 100 is provided with a main discharge port 150 for discharging all materials in the reactor 100. The main discharge port 150 is connected to a check valve to prevent the slurry from flowing back.

[0029] Specifically, the main discharge port 150 is connected to a filter press, which can separate the solid and liquid of the slurry to obtain leachate and leach residue.

[0030] In some specific embodiments, see Figure 1 and Figure 2 The liquid inlet of any of the multiple hydrogen peroxide inlet pipes 110 is connected to the hydrogen peroxide delivery main pipe 210 through the hydrogen peroxide delivery secondary pipe 160, which facilitates the connection of the pipelines.

[0031] For details, please refer to Figure 1 and Figure 2 The liquid inlet of any of the multiple hydrogen peroxide inlet pipes 110 is connected to a check valve 161. The check valve 161 is located on the corresponding hydrogen peroxide delivery secondary pipe 160 and can prevent the liquid in the reactor 100 from flowing back into the hydrogen peroxide storage tank 200.

[0032] For further information, see Figure 1 and Figure 2The liquid inlet of any of the multiple hydrogen peroxide inlet pipes 110 is connected to a water pump 162, which is located on the corresponding hydrogen peroxide delivery secondary pipe 160. Water pump 162 is used to control the pipeline pressure of the corresponding hydrogen peroxide delivery secondary pipe 160 and hydrogen peroxide inlet pipe 110, so that the multiple hydrogen peroxide inlet pipes 110 can evenly deliver hydrogen peroxide to the reactor 100 from liquid outlets at different heights. It can also achieve different hydrogen peroxide inlet pipes 110 delivering hydrogen peroxide to the reactor 100 at different flow rates. Preferably, water pump 162 is a centrifugal pump, which has a compact structure, a wide flow rate and head range, uniform flow rate, smooth operation, low vibration, and low maintenance and repair costs.

[0033] In some specific embodiments, see Figure 2 Eight hydrogen peroxide inlet pipes 110 are vertically arranged inside the reactor 100, which are sufficient to evenly and efficiently deliver hydrogen peroxide to the reactor 100.

[0034] In some specific embodiments, the vertical height difference between the liquid outlets of two adjacent hydrogen peroxide inlet pipes 110 is at least greater than 10 cm, so that hydrogen peroxide can be fully added at different heights in the reactor 100 and fully contact the slurry at different heights.

[0035] In some specific embodiments, see Figure 1 The liquid inlets of the multiple hydrogen peroxide inlet pipes 110 are all located at the same level, facilitating connection and installation with other pipelines. Preferably, the liquid inlets of the multiple hydrogen peroxide inlet pipes 110 are all located on the lower side of the circumference of the reactor 100, facilitating the arrangement of the liquid outlets of the hydrogen peroxide inlet pipes 110 in a stepped manner.

[0036] In some specific embodiments, see Figure 2 The hydrogen peroxide storage tank 200 is provided with a first tank liquid inlet 220 at the top, which is mainly used to inject cleaning water, etc. into the hydrogen peroxide storage tank 200; a second tank liquid inlet 230 is provided on the upper side of the circumference of the hydrogen peroxide storage tank 200, which is mainly used to inject hydrogen peroxide into the hydrogen peroxide storage tank 200; the hydrogen peroxide storage tank 200 is provided with a tank liquid outlet 240 at the bottom, which is connected to the hydrogen peroxide delivery main pipe 210 and is mainly used to deliver hydrogen peroxide to the hydrogen peroxide delivery main pipe 210.

[0037] For details, please refer to Figure 2 The first tank liquid inlet 220 and the second tank liquid inlet 230 are both connected to a one-way valve to prevent liquid from spraying out of the first tank liquid inlet 220 or the second tank liquid inlet 230.

[0038] It should be noted that the device for leaching lithium iron phosphate to recover lithium elements in powder of the present invention is also equipped with a sulfuric acid addition system, a pH value detection system, a temperature control system, a control terminal, etc. These are all existing and can be configured for the reactor 100 according to specific needs.

[0039] The operating process of the device for leaching lithium iron phosphate to recover lithium element in powder of the utility model is as follows:

[0040] (1) Reaction feeding: The lithium iron phosphate recovery powder slurry enters the reactor 100 through the main feed port 140; after the feeding is completed, the stirring motor 120 is turned on to drive the stirring paddle 130 to stir the materials;

[0041] (2) Leaching: 98% concentrated sulfuric acid is added to the reactor 100 and the pH value is adjusted to 1.5; the temperature of the reactor 100 is controlled to be 80-100°C; hydrogen peroxide is added to the reactor 100, and the hydrogen peroxide in the hydrogen peroxide storage tank 200 flows from the tank outlet 240 into the hydrogen peroxide delivery main pipe 210, and is then distributed to each hydrogen peroxide delivery sub-pipe 160, and finally flows into the reactor 100 from the liquid outlet of the corresponding hydrogen peroxide inlet pipe 110; the pipeline pressure of the corresponding hydrogen peroxide delivery sub-pipe 160 and the hydrogen peroxide inlet pipe 110 is controlled by the water pump 162;

[0042] (3) Discharging: After the ferrous ions are completely oxidized, the reaction is completed and the addition of hydrogen peroxide to the reactor 100 is stopped; the slurry after the reaction is discharged into the filter press through the main discharge port 150 for solid-liquid separation.

[0043] In the present invention, the hydrogen peroxide storage tank 200 can store a large amount of hydrogen peroxide, allowing for timely addition of hydrogen peroxide to the reactor 100. The stirring motor 120 drives the stirring paddle 130 to fully stir the materials in the reactor 100, improving their uniformity and ensuring a rapid and efficient reaction. Multiple hydrogen peroxide inlet pipes 110 are evenly spaced along the inner circumference of the reactor 100. The liquid outlets of the multiple hydrogen peroxide inlet pipes 110 are arranged in a stepped pattern and surround the stirring paddles 130. This allows hydrogen peroxide to be added at various heights within the reactor 100, ensuring full contact with the slurry at different heights. This effectively improves the uniformity of hydrogen peroxide addition and promotes rapid and uniform dispersion of hydrogen peroxide, avoiding localized excessive hydrogen peroxide concentrations and facilitating a uniform reaction. Furthermore, the presence of the multiple hydrogen peroxide inlet pipes 110 acts as a flow disruptor, further promoting rapid and uniform dispersion of hydrogen peroxide, facilitating a uniform reaction and improving reaction efficiency. Furthermore, multiple hydrogen peroxide inlet pipes 110 can simultaneously add hydrogen peroxide, thereby increasing the unit input amount of hydrogen peroxide and improving the contact efficiency between hydrogen peroxide and the materials in the reactor 100, thereby improving the oxidation efficiency of hydrogen peroxide. This can effectively reduce the decomposition loss of hydrogen peroxide, thereby reducing the amount of hydrogen peroxide used in the oxidation process, thereby saving production costs.

[0044] In addition, the liquid inlet of each hydrogen peroxide inlet pipe 110 is connected to a water pump 162. The water pump 162 can control the pipeline pressure of the corresponding hydrogen peroxide delivery secondary pipe 160 and the hydrogen peroxide inlet pipe 110, so that the multiple hydrogen peroxide inlet pipes 110 can uniformly deliver hydrogen peroxide to the reactor 100 from the liquid outlets at different heights. It can also achieve that different hydrogen peroxide inlet pipes 110 deliver hydrogen peroxide to the reactor 100 at different flow rates.

[0045] The above is a detailed introduction to a device for leaching lithium iron phosphate and recovering lithium elements in powder provided by an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A device for leaching lithium iron phosphate to recover lithium from powder, characterized in that: The device includes a reactor and a hydrogen peroxide storage tank independently arranged outside the reactor, and the hydrogen peroxide storage tank is connected to the reactor through a hydrogen peroxide delivery pipe; A plurality of hydrogen peroxide inlet pipes are vertically arranged inside the reactor. The plurality of hydrogen peroxide inlet pipes are evenly spaced along the inner circumference of the reactor. The liquid outlets of the plurality of hydrogen peroxide inlet pipes are arranged in a stepped manner in height. The liquid inlets of the plurality of hydrogen peroxide inlet pipes are all connected to the hydrogen peroxide delivery main pipe. A stirring motor is provided on the top of the reactor, and a stirring paddle is provided inside the reactor. The output end of the stirring motor is fixedly connected to the stirring paddle, and the stirring paddle is located in the middle of the multiple hydrogen peroxide input pipes.

2. The device for leaching lithium iron phosphate recovery powder according to claim 1, characterized in that: The top of the reactor is provided with a main feed port, and the bottom of the reactor is provided with a main discharge port.

3. The device for leaching lithium iron phosphate to recover lithium from powder according to claim 2, characterized in that: The main discharge port is connected to a filter press.

4. The device for leaching lithium iron phosphate to recover lithium from powder according to claim 1, characterized in that: The liquid inlet of any hydrogen peroxide inlet pipe among the plurality of hydrogen peroxide inlet pipes is connected to the hydrogen peroxide delivery main pipe via a hydrogen peroxide delivery secondary pipe.

5. The device for leaching lithium iron phosphate recovery powder according to claim 4, characterized in that: The liquid inlet of any of the multiple hydrogen peroxide inlet pipes is connected to a check valve, and the check valve is located on the corresponding hydrogen peroxide delivery secondary pipe.

6. The device for leaching lithium iron phosphate to recover lithium from powder according to claim 4 or 5, characterized in that: The liquid inlet of any of the multiple hydrogen peroxide inlet pipes is connected to a water pump, and the water pump is located on the corresponding hydrogen peroxide delivery secondary pipe.

7. The device for leaching lithium iron phosphate recovery powder according to claim 1, characterized in that: Eight hydrogen peroxide inlet pipes are vertically arranged inside the reactor.

8. The device for leaching lithium iron phosphate to recover lithium from powder according to claim 1, characterized in that: The height difference between the liquid outlets of two adjacent hydrogen peroxide inlet pipes in the vertical direction is at least greater than 10 cm.

9. The device for leaching lithium iron phosphate recovery powder according to claim 1, characterized in that: The liquid inlets of the multiple hydrogen peroxide input pipes are all located at the same horizontal height.

10. The device for leaching lithium iron phosphate recovery powder according to claim 1, characterized in that: The top of the hydrogen peroxide storage tank is provided with a first tank liquid inlet, the upper side of the circumference of the hydrogen peroxide storage tank is provided with a second tank liquid inlet, and the bottom of the hydrogen peroxide storage tank is provided with a tank liquid outlet, and the tank liquid outlet is connected to the hydrogen peroxide delivery main pipe.