Method for extracting lithium from waste positive electrode material
By employing low-temperature roasting and liquid-phase leaching, the problems of high lithium loss and environmental pollution in lithium-ion battery recycling have been solved, achieving efficient lithium extraction and simplifying the process, thus improving the economics and versatility of recycling.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGZHOU TINCI MATERIALS TECH
- Filing Date
- 2024-11-12
- Publication Date
- 2026-05-12
AI Technical Summary
Among existing lithium-ion battery recycling methods, traditional acid leaching and pyrometallurgical recycling result in high lithium loss, cumbersome processes, high costs, and serious environmental pollution, making it difficult to efficiently extract lithium and reduce the use of chemicals.
Low-temperature roasting technology is used to mix waste cathode materials with sugar compounds and roast them in an inert atmosphere at 350℃~450℃. Then, liquid phase leaching is performed to obtain a lithium-containing solution and leaching residue, which selectively extracts lithium and reduces the use of other chemicals.
It achieves efficient lithium extraction, reduces the use of other chemicals, simplifies the process, reduces energy consumption and environmental pollution, and improves the economic feasibility and industrial applicability of lithium-ion battery recycling.
Smart Images
Figure BDA0005129585520000051 
Figure BDA0005129585520000081
Abstract
Description
Technical Field
[0001] This application relates to the field of resource recycling technology, and in particular to a method for extracting lithium from waste cathode materials. Background Technology
[0002] Lithium-ion batteries are widely used in consumer electronics, power batteries, and energy storage batteries due to their advantages such as high energy density, long cycle life, and no memory effect. However, the average lifespan of lithium-ion batteries is 5-8 years. Discarded lithium-ion batteries contain harmful substances such as electrolytes and heavy metals, which can lead to serious environmental and safety problems if not properly disposed of. Meanwhile, due to the scarcity of energy metals and the ever-increasing market demand, the lithium, manganese, nickel, cobalt, and other energy metals abundant in spent lithium-ion batteries have become an important source of supplementary energy. Recycling these metals can not only bring certain economic benefits but also alleviate the problem of increasingly scarce metal resources. Therefore, from the perspectives of environmental protection, resource recycling, and economic development, the efficient recycling of spent lithium-ion batteries is crucial.
[0003] However, current lithium-ion battery recycling methods generally involve directly acid leaching the waste cathode material to obtain a mixed leachate containing lithium and other metals. This leachate is then purified to remove impurities and extract other valuable metals before lithium extraction. This process results in significant lithium loss and reduces the lithium recovery rate. The acid leaching process is not only cumbersome but also introduces excessive substances into the solution, leading to decreased recovery of valuable metals and lithium, and increased recycling costs. Furthermore, the use of large amounts of acid and alkali generates significant amounts of harmful gases, causing environmental pollution. Traditional pyrometallurgical recycling methods, using high-temperature roasting, increase unnecessary energy consumption and produce harmful substances. Therefore, it is necessary to develop suitable processes that efficiently extract lithium while reducing the use of other chemicals, thereby improving the economic feasibility and industrial applicability of waste lithium-ion battery recycling. Summary of the Invention
[0004] The purpose of this application is to provide a method for extracting lithium from waste cathode materials, which achieves efficient lithium extraction while reducing the use of other chemicals, thereby improving the economic feasibility and industrial applicability of waste lithium-ion battery recycling. The specific technical solution is as follows:
[0005] The first aspect of this application provides a method for extracting lithium from waste cathode materials, comprising the following steps:
[0006] Waste cathode material is mixed with a carbohydrate compound and calcined at 350℃~450℃ in an inert atmosphere to obtain a calcined product; the calcined product is subjected to liquid phase leaching treatment to obtain a lithium-containing solution and leaching residue; wherein the molecular weight of the carbohydrate compound is M, M≤365.
[0007] In some embodiments of this application, the carbohydrate compound is selected from at least one of sucrose, glucose, and maltose.
[0008] In some embodiments of this application, the mass ratio of waste cathode material to carbohydrate compound is 1:0.05 to 1:0.15.
[0009] In some embodiments of this application, the mixing method includes ball milling, with a ball milling speed of 300 r / min to 400 r / min and a ball milling time of 60 min to 120 min.
[0010] In some embodiments of this application, the calcination heating rate is 5℃ / min to 10℃ / min, and the calcination time is 60min to 240min.
[0011] In some embodiments of this application, the liquid phase leaching treatment is ball milling water leaching; in ball milling water leaching, the calcined product is mixed with water at a solid-liquid ratio of 100 g / L to 200 g / L, the ball milling water leaching speed is 300 r / min to 400 r / min, and the ball milling water leaching time is 60 min to 180 min.
[0012] In some embodiments of this application, the liquid phase leaching treatment is water leaching, in which the calcined product is mixed with water at a solid-liquid ratio of 50 g / L to 150 g / L, and stirred at a stirring rate of 100 r / min to 300 r / min for a water leaching time of 60 min to 180 min.
[0013] In some embodiments of this application, a lithium-containing solution is heated and concentrated to obtain a lithium-rich solution; the lithium-rich solution is then subjected to a lithium extraction operation to obtain a lithium-containing product.
[0014] In some embodiments of this application, the lithium-containing solution is heated to 100°C, and the concentration of lithium ions in the concentrated lithium-rich solution is greater than 15 g / L.
[0015] In some embodiments of this application, the lithium extraction operation involves adding sodium carbonate to a lithium-rich solution to obtain a lithium carbonate product; the sodium carbonate is a saturated sodium carbonate solution; and the molar ratio of sodium carbonate to lithium ions in the lithium-rich solution is 1:1 to 1:1.05.
[0016] In some embodiments of this application, the waste cathode material is a layered cathode material, which is selected from at least one of lithium cobalt oxide, lithium manganese oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide, and lithium nickel cobalt aluminum oxide.
[0017] The beneficial effects of this application are:
[0018] This application provides a method for extracting lithium from waste cathode materials, comprising the following steps: mixing the waste cathode material with a carbohydrate compound, and calcining it at 350℃~450℃ under an inert atmosphere to obtain a calcined product; subjecting the calcined product to liquid-phase leaching treatment to obtain a lithium-containing solution and leaching residue; wherein the molecular weight of the carbohydrate compound is M, M≤365. This application uses a low-temperature calcination method to treat waste cathode materials, which has a simple operation process, can efficiently extract lithium while reducing the use of other chemicals, avoiding the generation of large amounts of waste liquid and harmful gases during the lithium extraction process, and improving the economic feasibility and industrial applicability of waste lithium-ion battery recycling.
[0019] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Detailed Implementation
[0020] The technical solutions of this application will be clearly and completely described below with reference to the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.
[0021] This application provides a method for extracting lithium from waste cathode materials, which includes the following steps: mixing the waste cathode material with a carbohydrate compound and calcining it at 350℃~450℃ in an inert atmosphere to obtain a calcined product; subjecting the calcined product to liquid-phase leaching treatment to obtain a lithium-containing solution and leaching residue; wherein the molecular weight of the carbohydrate compound is M, and M≤365.
[0022] This application mixes waste cathode materials with sugar compounds and directly co-calcines them at low temperature to form a molten system. Then, the calcined product is leached in liquid phase to obtain a lithium-containing solution and leaching residue. This allows lithium to be leached preferentially over nickel, cobalt, and manganese, forming a soluble lithium salt. This reduces the problem of other valuable metals entering the lithium-containing leaching solution from the source, achieving selective and preferential lithium extraction. The entire process is simple and easy to operate, reducing the introduction of impurity ions. It does not require the use of acids, alkalis, or reducing agents, allowing lithium to be preferentially and efficiently extracted before traditional leaching, avoiding the generation of low-concentration lithium-containing raffinate, and reducing lithium loss during acid leaching.
[0023] In some embodiments of this application, after mixing the waste cathode material with a sugar compound, the calcination temperature can be 350℃, 370℃, 390℃, 400℃, 410℃, 430℃, 450℃, or a range of any two of these values. The calcination temperature affects the lithium-ion extraction rate. If the calcination temperature is below 350℃, the lithium-ion extraction rate is low, resulting in significant lithium loss. If the calcination temperature is above 450℃, not only does energy consumption increase, but the already generated lithium carbonate will also react deeply with the reduced nickel and cobalt, leading to a certain degree of decrease in the lithium-ion extraction rate. Calcination within the calcination temperature range specified in this application can achieve a higher lithium-ion extraction rate, thereby improving the lithium recovery rate.
[0024] In some embodiments of this application, the molecular weight of the carbohydrate compound is M, where M ≤ 365. For example, the molecular weight of the carbohydrate compound can be 180, 342, 360, or 365. If the molecular weight of the carbohydrate is greater than 365, such as using large molecular weight carbohydrates like starch, multiple decomposition steps are required for utilization, resulting in low utilization. Furthermore, using large molecular weight carbohydrates requires higher calcination temperatures, leading to energy consumption and increased production costs. The inventors have discovered that under the calcination conditions of this application and by selecting carbohydrate compounds with molecular weights within the range of this application, a single-step decomposition reaction can be performed at low temperatures to generate highly reducing substances such as carbon, hydrogen, and carbon monoxide. This reacts with the layered cathode material in a reducing calcination reaction, preferentially releasing lithium from the waste cathode material and depositing it in the carbonate as Li₂CO₃. (The text then mentions sucrose and LiNi as the main component, but this seems unrelated to the main application and is likely a separate, incomplete thought.) 0.8 Co 0.1 Mn 0.1 Taking the waste positive electrode material of O2 as an example, the reaction equation is as follows: C 12 H 22 O 11 +LiNi 0.8 Co 0.1 Mn 0.1 O2→Li2CO3+Ni+Co+MnO+H2O. Using the method of this application and selecting small molecule carbohydrate compounds can reduce the use of other chemicals while efficiently extracting lithium, avoiding the generation of large amounts of waste liquid and harmful gases during the lithium extraction process, and improving the economic feasibility and industrial applicability of waste lithium-ion battery recycling.
[0025] In this application, after the waste cathode material is roasted with sugar compounds at low temperature, the valuable metals (such as nickel, cobalt, manganese, etc.) in the waste cathode material are transformed into metallic or low-valence oxide states, which exist in the leaching residue after water leaching.
[0026] In some embodiments of this application, the carbohydrate compound is selected from at least one of sucrose, glucose, and maltose. Carbohydrate compounds are widely available, and using carbohydrate compounds within the scope of this application is beneficial for improving the lithium-ion extraction rate while also having lower production costs.
[0027] In some embodiments of this application, the mass ratio of waste cathode material to carbohydrate compound is 1:0.05 to 1:0.15. For example, the mass ratio of waste cathode material to carbohydrate compound can be 1:0.05, 1:0.06, 1:0.07, 1:0.08, 1:0.09, 1:0.1, 1:0.11, 1:0.12, 1:0.13, 1:0.14, 1:0.15, or a range of any two values therein. By adjusting the mass ratio of waste cathode material to carbohydrate compound within the range of this application, it is beneficial to the extraction of lithium coated in the waste cathode material and to improve the lithium recovery rate.
[0028] In some embodiments of this application, the atmosphere in which the waste cathode material and carbohydrate compounds are roasted is a protective atmosphere. This application does not specifically limit the gas in the protective atmosphere, as long as it meets the objectives of this application. For example, the gas in the protective atmosphere may include at least one of nitrogen, argon, and carbon dioxide.
[0029] In some embodiments of this application, the mixing method includes ball milling, with a milling speed of 300 r / min to 400 r / min and a milling time of 60 min to 120 min. For example, the milling speed can be 300 r / min, 350 r / min, 400 r / min, or a range of any two of these values; the milling time can be 60 min, 90 min, 120 min, or a range of any two of these values. By controlling the milling speed and time within the range of this application, the waste cathode material and sugar compounds can be mixed more uniformly, increasing the contact area between the waste cathode material and the sugar compounds, making the subsequent roasting process easier for selective lithium extraction, and further improving the selective lithium extraction rate during roasting.
[0030] In some embodiments of this application, the heating rate of calcination is 5°C / min to 10°C / min, and the calcination time is 60 min to 240 min. For example, the heating rate of calcination can be 5°C / min, 6°C / min, 7°C / min, 8°C / min, 9°C / min, 10°C / min, or a range of any two of these values; the calcination time can be 60 min, 90 min, 120 min, 150 min, 180 min, 210 min, 240 min, or a range of any two of these values. By controlling the heating rate and heating time within the range of this application, the reaction can be made sufficient while preventing the already extracted lithium from reacting with transition metal oxides to form new water-insoluble substances, thereby improving the lithium recovery rate.
[0031] In some embodiments of this application, the liquid phase leaching treatment method is ball milling and water leaching; in ball milling and water leaching, the calcined product and water are mixed at a solid-liquid ratio of 100 g / L to 200 g / L, the ball milling and water leaching speed is 300 r / min to 400 r / min, and the ball milling and water leaching time is 60 min to 180 min. For example, the solid-liquid ratio of the calcined product to water in ball milling and water leaching can be 100 g / L, 120 g / L, 150 g / L, 180 g / L, 200 g / L, or any two of these values; the ball milling and water leaching speed can be 300 r / min, 350 r / min, 400 r / min, or any two of these values; and the ball milling and water leaching time can be 60 min, 90 min, 120 min, 150 min, 180 min, or any two of these values. By controlling the solid-liquid ratio of the calcined product to water during ball milling and water immersion, as well as the rotation speed and time of ball milling and water immersion, within the range specified in this application, the leaching rate of lithium ions and the recovery rate of lithium can be further improved.
[0032] In some embodiments of this application, the liquid-phase leaching treatment is water leaching: the calcined product is mixed with water at a solid-liquid ratio of 50 g / L to 150 g / L, stirred at a stirring rate of 100 r / min to 300 r / min, and the water leaching time is 60 min to 180 min. For example, the solid-liquid ratio of the calcined product to water can be 50 g / L, 70 g / L, 100 g / L, 130 g / L, 150 g / L, or any two of these values; the stirring rate can be 100 r / min, 200 r / min, 300 r / min, or any two of these values; and the water leaching time can be 60 min, 90 min, 150 min, 180 min, or any two of these values. By controlling the solid-liquid ratio of the calcined product to water, the stirring rate, and the water leaching time within the ranges specified in this application, the leaching rate of lithium ions can be further improved.
[0033] In some embodiments of this application, a lithium-containing solution is heated and concentrated to obtain a lithium-rich solution; the lithium-rich solution is then subjected to a lithium extraction operation to obtain a lithium-containing product.
[0034] In some embodiments of this application, the lithium-containing solution is heated to 100°C, and the concentration of lithium ions in the concentrated lithium-rich solution is greater than 15 g / L.
[0035] In some embodiments of this application, the lithium extraction operation involves adding sodium carbonate to a lithium-rich solution to obtain lithium carbonate product; the sodium carbonate is a saturated sodium carbonate solution; and the molar ratio of sodium carbonate to lithium ions in the lithium-rich solution is 1:1 to 1:1.05. For example, the molar ratio of sodium carbonate to lithium ions in the lithium-rich solution can be 1:1, 1:1.03, 1:1.05, or a range consisting of any two of these values. Controlling the molar ratio of sodium carbonate to lithium ions in the lithium-rich solution within the range specified in this application is beneficial for the precipitation of lithium ions in the form of lithium carbonate. Filtration yields the lithium carbonate product, resulting in a high lithium recovery rate.
[0036] In some embodiments of this application, the waste cathode material is a layered cathode material, which is selected from at least one of lithium cobalt oxide, lithium manganese oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide, and lithium nickel cobalt aluminum oxide.
[0037] Example
[0038] The embodiments and comparative examples provided below illustrate the implementation of this application in more detail. Various tests and evaluations were conducted according to the methods described below. Furthermore, unless otherwise specified, "parts" and "%" are quality standards.
[0039] Test methods and equipment:
[0040] Calculation of extraction rate
[0041] Inductively coupled plasma (ICP) spectroscopy was performed on the waste cathode material, and the content of element A was found to be W1 (wt%). The mass of the waste cathode material to be extracted for lithium was weighed using a balance and was found to be M1 (g). ICP testing was performed on the lithium-containing solution after water immersion, and the content of element A was found to be W2 (g / L). The volume of the lithium-containing solution was found to be V1 (L).
[0042]
[0043] Element A can be lithium, nickel, cobalt, or manganese.
[0044] Example 1
[0045] In this embodiment, the main component of the waste cathode material is LiNi. 0.8 Co 0.1 Mn 0.1O2. The specific operational steps for extracting lithium from waste cathode materials are as follows:
[0046] (1) Take 100g of waste positive electrode powder and 10g of sucrose (molecular weight 342), mix and grind them in a ball mill for 60min at a speed of 400r / min.
[0047] (2) The mixed and ground materials are heated to 400°C in a nitrogen atmosphere at a heating rate of 5°C / min and the calcination time is 120min to obtain the calcined product.
[0048] (3) The calcined product and water were ball-milled and leached at a solid-liquid ratio of 150 g / L. The leaching temperature was room temperature, the leaching time was 60 min, and the ball milling speed was 400 r / min to obtain a lithium-containing solution and leaching residue. The extraction rates of lithium, nickel, cobalt, and manganese were 99.86%, 0.02%, 0.03%, and 0.03%, respectively.
[0049] (4) The lithium-containing solution is heated to 100°C and concentrated to obtain a lithium-rich solution. A saturated sodium carbonate solution is added to the lithium-rich solution at 100°C, wherein the molar ratio of sodium carbonate in the saturated sodium carbonate solution to lithium ions in the lithium-rich solution is 1:1.05. The solution is filtered and the filter residue is washed with water to obtain battery-grade lithium carbonate.
[0050] Example 2
[0051] Except for heating the mixed and ground materials to 350°C in step (2), the rest is the same as in Example 1.
[0052] Example 3
[0053] Except for heating the mixed and ground materials to 450°C in step (2), the rest is the same as in Example 1.
[0054] Example 4
[0055] Except for the use of 4g of sucrose in step (1), the rest is the same as in Example 1.
[0056] Example 5
[0057] Except for the use of 5g of sucrose in step (1), the rest is the same as in Example 1.
[0058] Example 6
[0059] Except for the use of 15g of sucrose in step (1), the rest is the same as in Example 1.
[0060] Example 7
[0061] Except for the use of 20g of sucrose in step (1), the rest is the same as in Example 1.
[0062] Example 8
[0063] Except for adjusting the roasting time to 60 min in step (2), the rest is the same as in Example 1.
[0064] Example 9
[0065] Except for adjusting the roasting time to 180 min in step (2), the rest is the same as in Example 1.
[0066] Example 10
[0067] Except for adjusting the roasting time to 240 min in step (2), the rest is the same as in Example 1.
[0068] Example 11
[0069] Except for adjusting the solid-liquid ratio of the calcined product and water to 100 g / L in step (3), the rest is the same as in Example 1.
[0070] Example 12
[0071] Except for adjusting the solid-liquid ratio of the calcined product and water to 200 g / L in step (3), the rest is the same as in Example 1.
[0072] Example 13
[0073] Except for adjusting the solid-liquid ratio of the calcined product and water to 250 g / L in step (3), the rest is the same as in Example 1.
[0074] Example 14
[0075] Except for step (3), which is adjusted to: leaching the roasted product and water at a solid-liquid ratio of 100 g / L, with a leaching temperature of room temperature, a leaching time of 60 min, and a stirring rate of 300 r / min to obtain a lithium-containing solution and leaching residue, the rest is the same as in Example 1.
[0076] Example 15
[0077] Besides using LiNi as the main component 0.5 Co 0.2 Mn 0.3 Except for the waste positive electrode material of O2, everything else is the same as in Example 1.
[0078] Example 16
[0079] Except for changing the type of carbohydrate compound to glucose (molecular weight 180), it is the same as in Example 1.
[0080] Example 17
[0081] Except for changing the type of carbohydrate compound to maltose (molecular weight 360), it is the same as in Example 1.
[0082] Comparative Example 1
[0083] Except for heating the mixed and ground materials to 300°C in step (2), the rest is the same as in Example 1.
[0084] Comparative Example 2
[0085] Except for heating the mixed and ground materials to 500°C in step (2), the rest is the same as in Example 1.
[0086] Comparative Example 3
[0087] Except for the use of 10g sodium bisulfate in step (1), the rest is the same as in Example 1.
[0088] Comparative Example 4
[0089] Except for the use of 10g of starch in step (1), the rest is the same as in Example 1.
[0090] The rest is the same as in Example 1.
[0091] The preparation parameters and performance parameters of each embodiment and comparative example are shown in Table 1.
[0092] Table 1
[0093]
[0094] Note: In Table 1, " / " indicates that the corresponding preparation parameters or substances do not exist.
[0095] During lithium extraction, the roasting temperature affects the lithium-ion extraction rate. As can be seen from Examples 1 to 3 and Comparative Examples 1 to 2, controlling the roasting temperature within the range specified in this application results in a higher lithium extraction rate and lower extraction rates for nickel, cobalt, and manganese. Comparative Example 1 shows that when the roasting temperature is below the range specified in this application, the lithium extraction rate is low, leading to significant lithium loss. Comparative Example 2 shows that excessively high roasting temperatures not only increase energy consumption but also decrease the lithium-ion extraction rate.
[0096] The mass ratio of waste cathode material to carbohydrate compounds affects the lithium extraction rate. Examples 1, 5, and 6 control the mass ratio of waste cathode material to carbohydrate compounds within the range specified in this application, which is beneficial for the extraction of lithium coated in the waste cathode material and improves the lithium recovery rate. Examples 4 and 7 show that when the mass ratio of waste cathode material to carbohydrate compounds exceeds the range specified in this application, the lithium extraction rate is lower.
[0097] As can be seen from Examples 1, 8 to 10, controlling the calcination time within the range of this application can ensure sufficient reaction while preventing the already extracted lithium from reacting with transition metal oxides to form new water-insoluble substances, thereby improving the lithium recovery rate.
[0098] As can be seen from Examples 1, 11, and 12, when the solid-liquid ratio of the calcined product to water during ball milling and water immersion is controlled within the range of this application, the lithium ion leaching rate is relatively high. In Example 13, the solid-liquid ratio of the calcined product to water during ball milling and water immersion is higher than the range of this application, resulting in a lower lithium extraction rate.
[0099] As can be seen from Example 14, the lithium extraction rate is relatively high when using water leaching for liquid phase leaching. As can be seen from Example 15, the method of this application achieves a high lithium extraction rate for waste cathode materials with different main components, while the extraction rates of metal elements such as nickel, cobalt, and manganese are relatively low.
[0100] As can be seen from Examples 16, 17, Comparative Example 3 and Comparative Example 4, using small-molecule carbohydrate compounds can reduce the use of other chemicals, avoid the generation of large amounts of waste liquid and harmful gases during the lithium extraction process, and at the same time, the calcination temperature is lower and the lithium extraction rate is higher.
[0101] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. A method for extracting lithium from waste cathode materials, comprising the following steps: Waste cathode material is mixed with carbohydrate compounds and calcined at 350℃~450℃ in an inert atmosphere to obtain calcined product; The calcined product was subjected to liquid phase leaching treatment to obtain a lithium-containing solution and leaching residue; The molecular weight of the carbohydrate compound is M, where M≤365.
2. The method according to claim 1, wherein, The carbohydrate compound is selected from at least one of sucrose, glucose, and maltose.
3. The method according to claim 1, wherein, The mass ratio of the waste cathode material to the carbohydrate compound is 1:0.05 to 1:0.
15.
4. The method according to any one of claims 1 to 3, wherein, The mixing method includes ball milling, wherein the ball milling speed is 300 r / min to 400 r / min, and the ball milling time is 60 min to 120 min.
5. The method according to any one of claims 1 to 3, wherein, The heating rate of the calcination is 5℃ / min to 10℃ / min, and the calcination time is 60min to 240min.
6. The method according to any one of claims 1 to 3, wherein, The liquid phase leaching treatment is ball milling and water leaching; in the ball milling and water leaching, the calcined product is mixed with water at a solid-liquid ratio of 100g / L to 200g / L, the ball milling and water leaching speed is 300r / min to 400r / min, and the ball milling and water leaching time is 60min to 180min.
7. The method according to any one of claims 1 to 3, wherein, The liquid phase leaching treatment is water leaching, in which the calcined product is mixed with water at a solid-liquid ratio of 50 g / L to 150 g / L and stirred at a stirring rate of 100 r / min to 300 r / min for a leaching time of 60 min to 180 min.
8. The method according to any one of claims 1 to 3, wherein, The lithium-containing solution is heated and concentrated to obtain a lithium-rich solution; the lithium-rich solution is then subjected to a lithium extraction operation to obtain a lithium-containing product.
9. The method according to claim 8, wherein, The lithium-containing solution is heated to 100°C, and the concentration of lithium ions in the concentrated lithium-rich solution is greater than 15 g / L.
10. The method according to claim 8, wherein, The lithium extraction operation involves adding sodium carbonate to the lithium-rich solution to obtain a lithium carbonate product; the sodium carbonate is a saturated sodium carbonate solution; the molar ratio of sodium carbonate to lithium ions in the lithium-rich solution is 1:1 to 1:1.
05.
11. The method according to any one of claims 1 to 3, wherein, The waste cathode material is a layered cathode material, and the layered cathode material is selected from at least one of lithium cobalt oxide, lithium manganese oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide, and lithium nickel cobalt aluminum oxide.