A high-value recycling method of waste lithium ion battery aluminum powder

Abstract

The application discloses a high-value recycling method of waste lithium ion battery aluminum powder, and belongs to the technical field of battery recycling. The method comprises the following steps: adding the waste lithium ion battery aluminum powder into a high-temperature reactor for heating, placing the aluminum powder into a separating agent solution after cooling, separating the aluminum powder through a superconducting magnetic fluid, removing waste water after ultrasonic screening, obtaining dry aluminum powder after drying, adding the dry aluminum powder into a vacuum distillation device after a hydrogen reduction reaction, adding a cosolvent to mix, heating to evaporate the dry aluminum powder, and obtaining electronic-grade aluminum powder products after condensation and recovery. In the high-value recycling process of the waste lithium ion battery aluminum powder, the separating agent separation, superconducting magnetic fluid, hydrogen reduction and cosolvent high-temperature evaporation processes are added, the operation is simple, the value of the final electronic-grade aluminum powder products is greatly improved, and large-scale industrial production can be realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery recycling, and particularly relates to a high-value recycling method of aluminum powder from waste lithium ion batteries. BACKGROUND

[0002] With the popularization and wide application of electronic products, the number of waste lithium ion batteries shows a trend of rapid growth. These waste batteries contain rich metal resources such as aluminum, copper, cobalt, lithium and the like, and have extremely high recycling value. The mainstream of waste battery recycling has two routes of full crushing and separation and fine disassembly. The aluminum powder from waste lithium ion batteries is obtained through full crushing and separation processes such as discharging, high temperature, crushing, screening and separation of waste batteries, and will be attached with positive electrode material, negative electrode material, binder, conductive agent, metal and the like. The existence of these impurities reduces the purity of the aluminum powder and affects its price and recycling value. Patent application No. CN118645723A discloses a recycling method of waste lithium ion battery pole piece, which comprises collecting the positive pole piece waste of waste lithium ion battery, placing it in a water solution containing a reducing agent, and after microwave reaction, the positive pole piece and the powder on the pole piece are separated, filtered, and the product is dried and screened. The undersize material is the powder on the pole piece, and the oversize material is the aluminum foil. The water-soluble reducing agent is stimulated by microwave radiation to generate hydrated electrons, and through a high-level reduction process, the binder is degraded to realize the recycling of aluminum.

[0003] The above-mentioned recycling process is the aluminum and positive electrode material treatment of the fine disassembly route process of waste batteries, and has problems such as high energy consumption, high pollution and low purity. Especially in the treatment of positive pole piece, it is difficult to ensure the purity of the aluminum material after recycling in the oxidizing atmosphere. Therefore, it is of great significance to develop a high-value recycling method of aluminum metal from waste lithium ion batteries for improving the added value of aluminum and promoting the resource utilization of waste lithium ion batteries. SUMMARY

[0004] The purpose of the present application is to provide a high-value recycling method of aluminum powder from waste lithium ion batteries to solve the problem of low recycling value of aluminum powder from waste lithium ion batteries.

[0005] The purpose of the present application can be realized by the following technical solutions:

[0006] The present application provides a high-value recycling method of aluminum powder from waste lithium ion batteries, comprising the following steps:

[0007] The aluminum powder from waste lithium ion batteries is added to a high-temperature reactor for heating, and after cooling, it is put into a separation agent solution, separated by superconducting magnetic fluid, and wet aluminum powder is obtained. After ultrasonic screening, waste water is removed, and after drying, dry aluminum powder is obtained. After hydrogen reduction reaction, it is added to a vacuum distillation device, mixed with a cosolvent, heated to evaporate the dry aluminum powder, and after condensation recovery, an electronic grade aluminum powder product is obtained.

[0008] In some possible implementation manners, the temperature of the high-temperature reactor is 100-1000 DEG C, and the reaction time is 2-3 h.

[0009] In some possible implementation manners, the ratio of the added amount of the surfactant in the separation agent solution to the amount of the aluminum powder of the waste lithium ion battery is 140-160 g:1000 kg.

[0010] In some possible implementation manners, the solvent is at least one of water, ethanol, ethyl acetate, dichloromethane and N-methyl pyrrolidone.

[0011] In some possible implementation manners, the surfactant is at least one of a cationic surfactant, an anionic surfactant and an amphoteric surfactant.

[0012] In some possible implementation manners, the surfactant is one of dodecylamine, hexadecylamine and sodium oleate.

[0013] In some possible implementation manners, the magnetic field strength of the superconducting magnetic fluid is 1-5 T; and the magnetic fluid is at least one of Fe, Ni, Co, Fe3O4 and γ-Fe2O3.

[0014] In some possible implementation manners, the high-temperature condition of the hydrogen reduction reaction is 700-1200 DEG C.

[0015] In some possible implementation manners, the co-solvent is at least one of tungsten, titanium, silicon and iron.

[0016] In some possible implementation manners, the vacuum degree of the vacuum environment is 10 -2 -10 -6 Pa.

[0017] Advantages of the present application:

[0018] The present application provides a high-value regeneration method of aluminum powder of waste lithium ion batteries, which adds separation agent separation, superconducting magnetic fluid, hydrogen reduction and co-solvent high-temperature evaporation processes in the high-value regeneration process of aluminum powder of waste lithium ion batteries, is simple to operate, and greatly improves the value of the final electronic-grade aluminum powder product, so that large-scale industrial production can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below with reference to the drawings.

[0020] Figure 1 is a flow chart of a high-value regeneration and utilization method of aluminum powder of waste lithium ion batteries. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0022] The following will be specifically described with the embodiments.

[0023] Embodiment 1

[0024] The embodiment provides a high-value recycling method of waste lithium ion battery aluminum powder, comprising the following steps: adding the waste lithium ion battery aluminum powder into a high-temperature reactor for heating, and then putting into a separating agent solution after cooling, and then performing superconducting magnetic fluid separation to obtain wet aluminum powder, and then removing waste water after ultrasonic screening, and then obtaining dry aluminum powder after drying, and then adding into a vacuum distillation device after hydrogen reduction reaction, and then adding a cosolvent to mix, and then heating to evaporate the dry aluminum powder, and then obtaining electronic-grade aluminum powder product after condensation recovery.

[0025] The waste lithium ion battery aluminum powder is added into a high-temperature reactor for heating, the temperature of the high-temperature reactor is 180℃, and the heating is performed for 2h; after heating, the waste lithium ion battery aluminum powder is put into a prepared separating agent solution, and then superconducting magnetic fluid density separation is performed, the separation magnetic field strength is 5T, and the separation time is 6h, so as to obtain wet aluminum powder; the separating agent solution comprises a surfactant and a solvent; the surfactant is dodecylamine, the solvent is water, the adding amount of the surfactant in the separating agent solution and the dosage of the waste lithium ion battery aluminum powder are in a ratio of 150g:1000kg. The solid-liquid ratio of the waste lithium ion battery aluminum powder and the separating agent solution is 1kg:2L.

[0026] The wet aluminum powder is subjected to ultrasonic screening and drying to obtain dry aluminum powder, the hydrogen reduction reaction is performed under a high-temperature condition of 700℃, a cosolvent silicon powder with an aluminum:silicon ratio of 1000:1 is added in a vacuum environment, the dry aluminum powder is evaporated by heating to 280℃, the vacuum degree of the vacuum environment is 10 -6 Pa, and electronic-grade aluminum powder product is obtained after condensation recovery.

[0027] Embodiment 2

[0028] Compared with the embodiment 1, the embodiment 1 is different from the embodiment 1 in that the adding amount of the surfactant in the separating agent solution and the dosage of the waste lithium ion battery aluminum powder are in a ratio of 160g:1000kg, and the rest of the raw materials and the preparation process are the same as those of the embodiment 1.

[0029] Embodiment 3

[0030] The embodiment is different from example 1 in that the amount of surfactant added in the separation agent solution and the ratio of the amount of waste lithium ion battery aluminum powder are 140g:1000kg, and the rest of the raw materials and the preparation process remain the same as example 1.

[0031] Example 4

[0032] The embodiment is different from example 1 in that the magnetic field strength of the superconducting magnetic fluid density separation is 3T, and the rest of the raw materials and the preparation process remain the same as example 1.

[0033] Example 5

[0034] The embodiment is different from example 1 in that the magnetic field strength of the superconducting magnetic fluid density separation is 4T, and the rest of the raw materials and the preparation process remain the same as example 1.

[0035] Example 6

[0036] The embodiment is different from example 1 in that the solid-liquid ratio of the waste lithium ion battery aluminum powder and the separation agent solution is 1kg:3L, and the rest of the raw materials and the preparation process remain the same as example 1.

[0037] Example 7

[0038] The embodiment is different from example 1 in that the co-solvent silicon powder is replaced by iron powder, and the proportion remains the same, and the rest of the raw materials and the preparation process remain the same as example 1.

[0039] Example 8

[0040] The embodiment is different from example 1 in that the co-solvent silicon powder is replaced by tungsten powder, and the proportion remains the same, and the rest of the raw materials and the preparation process remain the same as example 1.

[0041] Comparative example 1

[0042] The embodiment is different from example 1 in that no co-solvent is added, and the rest of the raw materials and the preparation process remain the same as example 1.

[0043] Purity tests were performed on examples 1-8 and comparative example 1, and the results are shown in table 1:

[0044] Table 1

[0045]

[0046] According to table 1 combined with the examples, the amount of surfactant, the magnetic field strength of the superconducting magnetic fluid, and the purity of the electronic grade aluminum powder are in a positive correlation, and the type and addition of the co-solvent also affect the purity of the electronic grade aluminum powder.

[0047] It is to be understood that the terminology used herein such as first and second, and the like, is only used to distinguish one entity or action from another entity or action, and does not necessarily require or imply any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0048] While embodiments of the present application have been shown and described with reference to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application. The scope of the application is defined by the appended claims and their equivalents.

Claims

1. A high-value recycling method of waste lithium-ion battery aluminum powder, characterized by, The method comprises the following steps: The waste lithium ion battery aluminum powder is added into a high-temperature reactor and heated, and then put into a separating agent solution after cooling, and then separated by a superconducting magnetic fluid to obtain wet aluminum powder, and then removed from waste water by ultrasonic screening, and then dried to obtain dry aluminum powder, and then added into a vacuum distillation device after hydrogen reduction reaction, and then mixed with a cosolvent, and then heated to evaporate the dry aluminum powder, and then condensed and recovered to obtain an electronic-grade aluminum powder product; The separating agent solution comprises a surfactant and a solvent; the mass ratio of the dry aluminum powder to the cosolvent is 1000:1; and the cosolvent is at least one of tungsten, titanium, silicon and iron.

2. The method for high-value regeneration of waste lithium-ion battery aluminum powder according to claim 1, characterized in that, The temperature of the high-temperature reactor is 100-1000℃, and the reaction time is 2-3h.

3. The method according to claim 1, wherein the method is characterized by, The adding amount of the surfactant in the separating agent solution and the amount of the waste lithium ion battery aluminum powder are in a ratio of 140-160g:1000kg.

4. The method for high-value regeneration of waste lithium-ion battery aluminum powder according to claim 1, characterized in that, The solvent is at least one of water, ethanol, ethyl acetate, dichloromethane and N-methyl pyrrolidone.

5. The method for high-value regeneration of waste lithium-ion battery aluminum powder according to claim 1, characterized in that, The surfactant is at least one of a cationic surfactant, an anionic surfactant and an amphoteric surfactant.

6. The method according to claim 1, wherein the method is characterized by, The magnetic field strength of the superconducting magnetic fluid is 1-5T; and the magnetic fluid is at least one of Fe, Ni, Co, Fe3O4 and γ-Fe2O3.

7. The method according to claim 1, wherein the method is characterized by, The high-temperature condition of the hydrogen reduction reaction is 700-1200℃. 8.The method of claim 1, wherein the method is characterized by, The vacuum degree of the vacuum environment is 10 -2 -10 -6 Pa.

Images