A method for recovering nickel-cobalt-manganese salt solution from NCMA precursor solid waste

Abstract

The application belongs to the technical field of resource recycling and recycling, and particularly relates to a method for recovering a nickel-cobalt-manganese salt solution from NCMA precursor solid waste. The application provides a process for recovering a nickel-cobalt-manganese salt solution with low impurity content from NCMA precursor solid waste, which can be directly used for production of a ternary precursor, and the process comprises the following steps: (1) adding the solid waste into a bottom solution with a certain H + concentration; (2) controlling the feeding amount, reaction time, stirring speed, temperature and other conditions to accurately control the pH after reaction; and (3) filtering to obtain a nickel-cobalt-manganese salt solution which can be directly used for production of a ternary precursor. The application eliminates the step of adding a precipitant to adjust the pH, saves economic cost and reaction time, improves the convenience of operation, does not introduce other substances, and helps to solve the problem that ternary precursor enterprises have difficulty in treating solid waste during production of NCMA precursors. Therefore, the application has excellent production efficiency and wide industrial application prospect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of new energy resource recycling, and particularly relates to a recycling method for valuable metals nickel, cobalt and manganese in an NCMA precursor solid waste. BACKGROUND

[0002] With the continuous improvement of battery performance requirements, nickel-cobalt-manganese ternary positive electrode materials are continuously developing towards high nickelization. Many studies have shown that Al 3+ In high-nickel ternary positive electrode materials, Al can stabilize the layered structure and alleviate the irreversible phase transition of the structure, thereby improving the cycle performance of the positive electrode material. The preparation of aluminum-doped or coated NCMA precursor by coprecipitation has the advantages of uniform element distribution and cost savings. However, in the development and production process of the precursor, it is inevitable that the precursor solid waste needs to be treated, and the solid waste contains a large amount of valuable metals nickel, cobalt and manganese, but due to its high aluminum content, it cannot be directly used for the production of ternary precursors after leaching.

[0003] Currently, the main treatment method in the industry is to leach the NCMA solid waste with acid, then add a precipitating agent to adjust the pH to an appropriate range, and then precipitate the aluminum in the form of aluminum hydroxide after solid-liquid separation to obtain the aluminum-removed liquid. For example, CN 116179872A discloses a method for recovering nickel and cobalt solution from waste nickel-cobalt-aluminum ternary precursor. The method first dissolves the acid and nickel-cobalt-aluminum solid waste in a reaction kettle, continues to react for 1-3 hours after adding a reducing agent, adjusts the pH to 4-5, and then adds a filter aid and heats for 1-3 hours before performing solid-liquid separation to obtain a nickel-cobalt solution. This method requires a precipitating agent to remove aluminum, has many operation steps, and is prone to increase the sodium content, making it difficult to further process or apply. In addition, the precipitation process takes a long time and has low efficiency, and the method does not involve a one-step method for recovering nickel, cobalt and manganese solution. CN 115821048A discloses a method for recovering nickel and cobalt from NC / NCA precursor waste. The method includes leaching, P204 leaching resin impurity removal, special resin oil removal, resin column fluorine and silicon removal, and filtration of NCA solid waste to obtain a nickel-cobalt salt solution. This method involves many processes, and has higher time and economic costs. Based on the limitations of the prior art, the present application proposes a method for recovering nickel, cobalt and manganese salt solution from aluminum-doped / coated NCMA solid waste without using a precipitating agent in a one-step method, to further reduce the complexity of the operation steps and the high processing cost, and to be more suitable for industrial large-scale production. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a method for one-step recovery and utilization of nickel, cobalt and manganese in lithium battery precursor NCMA hydroxide solid waste, which is simple to operate, low in cost, does not need any extraction, and can obtain a nickel, cobalt and manganese salt solution which can be directly used as a raw material for lithium battery ternary precursor.

[0005] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions:

[0006] A method for recovering and utilizing NCMA precursor solid waste to prepare a nickel and manganese salt solution, comprising the following steps:

[0007] (1) Acid dissolution: the NCMA solid waste is added to a bottom liquid and stirred for a certain time to obtain an acid-dissolved solution;

[0008] (2) Reaction: a dissolving aid is introduced into the acid-dissolved solution obtained in step (1), and the stirring is continued for a certain time to obtain a reaction slurry with a certain pH value;

[0009] (3) Solid-liquid separation: the reaction slurry obtained in step (2) is introduced into a filter press to obtain a filtrate and a filter residue, the filtrate is further introduced into a precision filter to obtain a nickel, cobalt and manganese salt solution which can be directly used for preparing an NCM precursor, and the filter residue can be continuously used for feeding in step (1) for continuous reaction.

[0010] In order to better realize the present application, further, the H + concentration in the bottom liquid in step (1) is 4.8-5.4 mol / L, and the temperature is not lower than 60 DEG C, which further ensures the acid dissolution effect and saves energy; more preferably, the bottom liquid temperature is 65-75 DEG C, and the H + concentration in the bottom liquid is 5.0-5.2 mol / L; by accurately controlling the H + concentration in the bottom liquid, the subsequent one-step aluminum removal is facilitated; if the H + concentration is too low, the NCMA solid waste dissolution rate will be reduced, and the production capacity will be reduced; if the H + concentration is too high, the slurry pH after reaction will be too low, and the aluminum cannot be completely precipitated.

[0011] In order to better realize the present application, further, the configuration step of the bottom liquid in step (1) comprises: after adding pure water with a certain temperature in a reaction kettle, sulfuric acid is introduced and stirred to make the H + concentration in the bottom liquid of the reaction kettle meet the requirements, and the temperature in the reaction kettle is kept constant; the sulfuric acid can be dilute sulfuric acid or concentrated sulfuric acid;

[0012] More preferably, the temperature of the pure water added in step (1) is 60-80 DEG C, and the concentration of the dilute sulfuric acid is 5-5.5 mol / L, so that the H +The concentration is 4.8-5.4 mol / L, the temperature in the reaction kettle is consistent with the temperature of the pure water;

[0013] More preferably, the temperature of the pure water is 65-75 DEG C, the concentration of the dilute sulfuric acid is 5.5 mol / L, the H + The concentration is 5.0-5.2 mol / L.

[0014] In order to better realize the present application, further, the solid content of the reaction slurry is 180-210 g / L by adding the NCMA solid waste in step (1), the pH of the slurry after reaction in step (2) is controlled in a specified range by accurately controlling the solid content of the reaction slurry; more preferably, the stirring speed is 500-900 rpm, and the stirring time is 1-3 hours.

[0015] More preferably, the solid content is controlled to be 190-200 g / L, the stirring speed is 600-800 rpm, and the stirring time is 1.5-2.5 hours.

[0016] In order to better realize the present application, further, the cosolvent in step (2) is hydrogen peroxide, the mass concentration of the hydrogen peroxide is 27.5-30%, the amount of the hydrogen peroxide added is 5% of the total volume of the reaction slurry, and the hydrogen peroxide is fed for not less than 1 hour by controlling the flow rate; the feeding time is controlled to further ensure the dissolution effect.

[0017] More preferably, the cosolvent is hydrogen peroxide, the concentration of the hydrogen peroxide is 27.5%, and the hydrogen peroxide is fed for 1 hour.

[0018] In order to better realize the present application, further, after the cosolvent is fed in step (2), the obtained reaction slurry is continuously stirred until the pH of the reaction slurry is 5.2-5.8; if the pH of the obtained reaction slurry is too high, the nickel, cobalt and manganese will be precipitated, and the yield is reduced; if the pH is too low, the aluminum ions in the reaction slurry may not be completely precipitated; more preferably, the stirring speed is 500-900 rpm, and the stirring time is 1.5 hours.

[0019] More preferably, the stirring speed is 600-800 rpm, and the pH of the obtained reaction slurry is 5.3-5.7.

[0020] In the present application, the main components of the filter residue obtained in step (3) are unreacted NCMA precursor particles and a small amount of crystalline aluminum compounds, the filter residue does not block the filter cloth of the filter press, the filterability of the filter residue is good, and the filter residue can be directly fed into the next recovery reaction without slurry washing.

[0021] In the present application, the filtrate obtained in step (3) is a nickel, cobalt and manganese salt solution which can be directly used for the production of ternary precursors, the content of Na is not higher than 0.1000 g / L, and the content of aluminum is not higher than 0.0050 g / L.

[0022] The application solves the problem that it is difficult to recycle the aluminum-containing solid waste during the production of aluminum-doped / coated NCMA precursor by the current ternary NCM precursor, effectively improves the resource utilization rate, and further reduces the environmental pollution caused by the reasonable utilization of the NCMA precursor solid waste.

[0023] Compared with the prior art, the application has the following beneficial effects:

[0024] (1) The method can fully utilize the NCMA precursor solid waste to recover and prepare ternary precursor raw material solution. + The content of Na in the obtained solution is relatively high, thereby resulting in a high sodium content of the ternary precursor prepared by using the solution as a raw material. + .

[0025] (2) The method saves the step of "precipitation", compared with the traditional method, a large amount of reaction time is saved, the operation convenience is improved, the single recovery yield can reach more than 50%, and the production capacity is further improved.

[0026] (3) The method realizes complete precipitation of aluminum while minimizing the precipitation of nickel, cobalt and manganese by precisely controlling the reaction conditions, thereby improving the yield of the nickel-cobalt-manganese salt solution.

[0027] The application provides a method for recycling and utilizing NCMA precursor solid waste to prepare a nickel-cobalt-manganese salt solution. + By precisely controlling the H content in the acid-dissolved bottom solution, the solid waste input amount, the amount of a dissolving agent and the reaction time, one-step aluminum removal is realized, the use of a precipitant is avoided, the reaction time is greatly shortened, the production capacity is improved, and the problem of difficult treatment of solid waste during the production of NCMA precursor by ternary precursor enterprises is solved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A process flow chart for obtaining a nickel-cobalt-manganese salt solution from NCMA precursor solid waste is provided.

[0029] Figure 2 An SEM image of the NCMA precursor solid waste before reaction in Example 1 of the application is provided.

[0030] Figure 3 An SEM image of the precursor filter residue after reaction in Example 1 of the application is provided. DETAILED DESCRIPTION

[0031] For the convenience of understanding, the technical solutions and embodiments of the present application are further clearly, completely and specifically described below by means of specific examples in combination with the drawings. It should be noted that the described examples of the present application are implemented on the premise of the technical solutions of the present application, and detailed embodiments and specific operation processes are given, but only a part of the examples of the present application, not all the examples. The specific embodiments described are only used to illustrate and explain the present application, and do not limit the present application. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] The experimental methods used in the following examples are conventional methods unless otherwise specified. The materials, reagents and the like used in the examples can be obtained from commercial channels unless otherwise specified.

[0033] Example 1

[0034] (1) Add 65℃ pure water and 5.5mol / L dilute sulfuric acid solution into the reaction kettle to make the concentration of the solution H + in the reaction kettle be 5mol / L, and stir uniformly to obtain a reaction bottom solution. The temperature of the reaction kettle is kept at 65℃.

[0035] (2) Put the NCMA precursor solid waste into the reaction bottom solution to make the solid content in the slurry reach 190g / L. Stir at a speed of 700rpm for 2 hours to obtain an acid-dissolved solution.

[0036] (3) Pass 27.5% hydrogen peroxide solution into the acid-dissolved solution, and the total amount of the hydrogen peroxide solution is 5% of the volume of the acid-dissolved solution. By controlling the flow rate of the hydrogen peroxide solution, the time of passing in is 1 hour. After the hydrogen peroxide solution is passed in, continue to stir for 1.5 hours, and the stirring speed is 700rpm during the process. A slurry with a pH of 5.5 is obtained.

[0037] (4) Pass the slurry obtained in step (3) into a filter tank to filter to obtain a filtrate and a filter residue. The filtrate is transported to a filter press for further filtration to obtain a nickel-cobalt-manganese salt solution which can be directly used for preparing NCM precursor. The filter residue is pressed to dryness, and then put into the reaction kettle for continuous reaction as raw material for the next reaction.

[0038] Figure 1 The SEM image of the NCMA precursor solid waste before reaction in Example 1 is shown in FIG. 1, and the particle size thereof is 3.58μm, Figure 2 The SEM image of the precursor filter residue after reaction in Example 1 is shown in FIG. 2, and the particle size thereof is 2.74μm. The impurity content of the nickel-cobalt-manganese salt solution obtained in Example 1 is tested, and the impurity content is shown in Table 1. The NCMA solid waste put into Example 1 and the nickel-cobalt-manganese salt solution obtained by reaction are tested by ICP, and it is calculated that the recovery rate of the nickel-cobalt-manganese salt solution is 51.66%.

[0039] Example 2

[0040] (1) Add 80℃ pure water and 5.5mol / L dilute sulfuric acid solution into the reaction kettle to make the concentration of H2SO4 in the reaction kettle be 5mol / L, and stir uniformly to obtain the reaction bottom liquid, and the temperature of the reaction kettle is kept at 80℃. + +

[0041] (2) Put the NCMA precursor solid waste into the reaction bottom liquid to make the solid content in the slurry reach 210g / L, and the stirring speed is 500rpm, and after stirring for 1 hour, the acid-dissolved liquid is obtained.

[0042] (3) Pass 27.5% hydrogen peroxide solution into the acid-dissolved liquid, and the total amount of hydrogen peroxide solution passed is 5% of the volume of the acid-dissolved liquid, and by controlling the flow rate of the hydrogen peroxide solution, the passing time is 1 hour, and after passing the hydrogen peroxide solution, continuous stirring is carried out for 1.5 hours, and the stirring speed during the process is 500rpm, and the slurry with pH of 5.7 is obtained.

[0043] (4) Pass the slurry obtained in step (3) into a pressure filter tank to filter to obtain filtrate and filter residue, the filtrate is transported to a precision filter for filtration again to obtain a nickel-cobalt-manganese salt solution which can be directly used for preparing NCM precursor; and the filter residue is dried by pressure to be used as raw material for the next reaction and put into the reaction kettle for continuous reaction.

[0044] The impurity content of the nickel-cobalt-manganese salt solution obtained in Example 2 is tested, and the impurity content is shown in Table 1; the NCMA solid waste put in Example 2 and the nickel-cobalt-manganese salt solution obtained by reaction are tested by ICP, and after calculation, it is known that the recovery rate of the nickel-cobalt-manganese salt solution is 51.43%.

[0045] Example 3

[0046] (1) Add 60℃ pure water and 5.5mol / L dilute sulfuric acid solution into the reaction kettle to make the concentration of H2SO4 in the reaction kettle be 5.4mol / L, and stir uniformly to obtain the reaction bottom liquid, and the temperature of the reaction kettle is kept at 65℃. + +

[0047] (2) Put the NCMA precursor solid waste into the reaction bottom liquid to make the solid content in the slurry reach 180g / L, and the stirring speed is 800rpm, and after stirring for 3 hours, the acid-dissolved liquid is obtained.

[0048] (3) Pass 27.5% hydrogen peroxide solution into the acid-dissolved liquid, and the total amount of hydrogen peroxide solution passed is 5% of the volume of the acid-dissolved liquid, and by controlling the flow rate of the hydrogen peroxide solution, the passing time is 1 hour, and after passing the hydrogen peroxide solution, continuous stirring is carried out for 1.5 hours, and the stirring speed during the process is 800rpm, and the slurry with pH of 5.3 is obtained.

[0049] (4) The slurry obtained in step (3) is filtered in a filter tank to obtain filtrate and residue, and the filtrate is transported to a precision filter for re-filtering to obtain a nickel-cobalt-manganese salt solution which can be directly used for preparing NCM precursor.

[0050] The impurity content of the nickel-cobalt-manganese salt solution obtained in Example 3 was tested, and the impurity content is shown in Table 1; the NCM A solid waste material put in Example 3 and the nickel-cobalt-manganese salt solution obtained by reaction were tested by ICP, and it was calculated that the recovery rate of the nickel-cobalt-manganese salt solution was 51.97%.

[0051] Comparative Example 1

[0052] (1) 65℃ pure water and 5.5mol / L dilute sulfuric acid solution were added to the reaction kettle to make the concentration of H + in the solution in the reaction kettle 5.0mol / L, and the solution was stirred uniformly to obtain a reaction bottom solution, and the temperature of the reaction kettle was kept at 65℃.

[0053] (2) The NCM A precursor solid waste material was put into the reaction bottom solution to make the solid content in the slurry reach 90g / L, and the stirring speed was 700rpm, and after stirring for 2 hours, an acid-dissolved solution was obtained.

[0054] (3) 27.5% hydrogen peroxide solution was introduced into the acid-dissolved solution, and the total amount of hydrogen peroxide solution introduced was 5% of the volume of the acid-dissolved solution, and the introduction time was 1 hour by controlling the flow rate of the hydrogen peroxide solution. After the hydrogen peroxide solution was introduced, the stirring was continued for 1.5 hours, and the stirring speed was 700rpm during the process, and a slurry with pH of 2.5 was obtained.

[0055] (4) 5mol / L sodium hydroxide solution was introduced into the slurry obtained in step (3), and the stirring speed was 700rpm, and the pH was adjusted to 5.5, and after continuous stirring for 1 hour, an aluminum-removed solution was obtained.

[0056] (5) The slurry obtained in step (4) was filtered in a filter tank to obtain filtrate and residue, and the filtrate was transported to a precision filter for re-filtering to obtain a nickel-cobalt-manganese salt solution which can be directly used for preparing NCM precursor.

[0057] The impurity content of the nickel-cobalt-manganese salt solution obtained in Comparative Example 1 was tested, and the impurity content is shown in Table 1; the NCM A solid waste material put in Comparative Example 1 and the nickel-cobalt-manganese salt solution obtained by reaction were tested by ICP, and it was calculated that the recovery rate of the nickel-cobalt-manganese salt solution was 99.19%.

[0058] Comparative Example 2

[0059] (1) 65℃ pure water and 5.5mol / L dilute sulfuric acid solution were added to the reaction kettle to make the concentration of H +The concentration of the solution of H2SO4 is 4.0 mol / L, and the reaction bottom liquid is obtained after uniform stirring. The temperature of the reaction kettle is kept at 65°C.

[0060] (2) The NCMA precursor solid waste is added to the reaction bottom liquid to make the solid content in the slurry reach 100 g / L. The stirring speed is 700 rpm, and the acid-dissolved liquid is obtained after 2 hours of stirring.

[0061] (3) The 27.5% hydrogen peroxide solution is introduced into the acid-dissolved liquid, and the total amount of introduction is 5% of the volume of the acid-dissolved liquid. The introduction time is 1 hour by controlling the flow rate of the hydrogen peroxide solution. The stirring is continued for 1.5 hours after the introduction of the hydrogen peroxide solution, and the stirring speed is 700 rpm during the process. The slurry with a pH of 4.1 is obtained.

[0062] (4) The slurry obtained in step (3) is introduced into a pressure filter tank to obtain a filtrate and a filter residue.

[0063] The impurity content of the nickel-cobalt-manganese salt solution obtained in Comparative Example 2 is tested, and the impurity content is shown in Table 1. The solution contains a high aluminum content, and the use standard of the nickel-cobalt-manganese salt solution is not met.

[0064] Comparative Example 3

[0065] (1) The 65°C pure water and the 5.5 mol / L dilute sulfuric acid solution are added to the reaction kettle to make the concentration of H2SO4 in the solution of the reaction kettle reach 5.0 mol / L. The reaction bottom liquid is obtained after uniform stirring. The temperature of the reaction kettle is kept at 65°C. +

[0066] (2) The NCMA precursor solid waste is added to the reaction bottom liquid to make the solid content in the slurry reach 90 g / L. The stirring speed is 700 rpm, and the acid-dissolved liquid is obtained after 2 hours of stirring.

[0067] (3) The 27.5% hydrogen peroxide solution is introduced into the acid-dissolved liquid, and the total amount of introduction is 5% of the volume of the acid-dissolved liquid. The introduction time is 1 hour by controlling the flow rate of the hydrogen peroxide solution. The stirring is continued for 1.5 hours after the introduction of the hydrogen peroxide solution, and the stirring speed is 700 rpm during the process. The slurry with a pH of 2.5 is obtained.

[0068] (4) The NCMA solid waste is supplemented to the slurry obtained in step (3) to adjust the pH to 5.5. In order to make the reaction more sufficient and accurately control the pH, multiple supplementations of the NCMA are required. The time interval of each supplementation is about 2 hours, the single supplementation amount is small, the total supplementation amount is about 10-15% of the amount of the material in step (1), and the stirring speed is kept at 700 rpm during the process. The aluminum-removed liquid is obtained after about 15-30 hours of completion of the step.

[0069] ​(5) The slurry obtained in step (4) is filtered in a filter tank to obtain a filtrate and a filter residue, and the filtrate is transported to a precision filter for filtration again to obtain a nickel-cobalt-manganese salt solution that can be directly used for preparing an NCM precursor.

[0070] The impurity content of the nickel-cobalt-manganese salt solution obtained in Comparative Example 3 is tested, and the impurity content is shown in Table 1; the NCM A solid waste material put into Comparative Example 3 and the nickel-cobalt-manganese salt solution obtained by reaction are subjected to ICP testing, and it is calculated that the recovery rate of the nickel-cobalt-manganese salt solution is 93.32%.

[0071] Table 1: Impurity content of the recovered liquid in each example and comparative example

[0072]

[0073] It can be seen from the above examples and comparative examples that the method for recycling and utilizing the NCM A precursor solid waste material to prepare a nickel-cobalt-manganese salt solution provided by the present application realizes a one-step recovery method by accurately controlling the reaction conditions, while reducing material consumption and saving reaction time; the impurity content of the recovered liquid obtained is low, the Na content in the material liquid is low compared with the traditional method, and a nickel-cobalt-manganese salt solution that can be directly used for a ternary precursor raw material is obtained, which plays a role in reducing costs and increasing efficiency for ternary precursor enterprises.

[0074] Finally, it should be noted that: the above is a preferred embodiment of the present application, the present application is not limited to the above embodiment, although the present application has been described in detail with reference to the foregoing examples, for those skilled in the art, it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for recovering nickel-cobalt-manganese salt solution from NCMA precursor solid waste, characterized in that, Includes the following steps: (1) Acid dissolution: Add NCMA solid waste to the bottom liquid and stir for a certain period of time to obtain the acid-dissolved liquid; (2) Reaction: A co-solvent is introduced into the acid-dissolved solution obtained in step (1), and the mixture is stirred continuously for a certain period of time to obtain a reaction slurry with a certain pH. The co-solvent in step (2) is hydrogen peroxide, with a mass concentration of 27.5-30%. The amount of hydrogen peroxide added is 5% of the total volume of the reaction slurry. The flow rate is controlled so that the hydrogen peroxide is introduced for a period of not less than 1 hour. After the co-solvent is introduced, the mixture is stirred continuously until the pH of the obtained reaction slurry is 5.2-5.

8. (3) Solid-liquid separation: The reaction slurry obtained in step (2) is passed into a filter press for filtration to obtain filtrate and filter residue. The filtrate is then passed into a fine filter for further filtration to obtain a nickel-cobalt-manganese salt solution that can be directly used to prepare NCM precursors. The Na content in the nickel-cobalt-manganese salt solution is not higher than 0.1000 g / L and the aluminum content is not higher than 0.0050 g / L.

2. The method for recovering nickel-cobalt-manganese salt solution from NCMA precursor solid waste according to claim 1, characterized in that, In step (1), the H+ concentration in the base solution is 4.8–5.4 mol / L, and the temperature is not lower than 60℃.

3. The method for recovering nickel-cobalt-manganese salt solution from NCMA precursor solid waste according to claim 2, characterized in that, The preparation steps of the bottom solution in step (1) include: adding pure water at a certain temperature to the reactor, then introducing sulfuric acid and stirring to ensure that the H+ concentration in the bottom solution meets the requirements and that the temperature inside the reactor remains constant.

4. The method for recovering nickel-cobalt-manganese salt solution from NCMA precursor solid waste according to claim 1, characterized in that, In step (1), NCMA solid waste is added to make the solid content of the reaction slurry 180-210 g / L.

5. The method for recovering nickel-cobalt-manganese salt solution from NCMA precursor solid waste according to claim 4, characterized in that, In step (1), the stirring speed is 500-900 rpm and the stirring time is 1-3 hours.

6. The method for recovering nickel-cobalt-manganese salt solution from NCMA precursor solid waste according to claim 1, characterized in that, In step (2), stir for 1.5 hours at a stirring speed of 500-900 rpm.

7. The method for recovering nickel-cobalt-manganese salt solution from NCMA precursor solid waste according to claim 1, characterized in that, After passing the co-solvent in step (2), continue stirring for 1.5 hours at a speed of 600-800 rpm until the pH of the resulting reaction slurry is 5.3-5.

7.

8. A method for recovering nickel-cobalt-manganese salt solution from NCMA precursor solid waste according to any one of claims 1-7, characterized in that, The filter residue from step (3) can be directly fed into the next recycling reaction for recovery.

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