CN113921928B - Method for recycling heavy metal in waste lithium battery anode material - Google Patents
Method for recycling heavy metal in waste lithium battery anode material Download PDFInfo
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- CN113921928B CN113921928B CN202111175610.1A CN202111175610A CN113921928B CN 113921928 B CN113921928 B CN 113921928B CN 202111175610 A CN202111175610 A CN 202111175610A CN 113921928 B CN113921928 B CN 113921928B
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- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/502—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese for non-aqueous cells
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
Abstract
The invention discloses a method for recycling heavy metals in a waste lithium battery anode material, which creatively uses ascorbic acid and fulvic acid in a matching way as mixed acid solutions to simultaneously recycle two different lithium ion battery anode materials in one step, wherein the ascorbic acid releases H in aqueous solution + The method has weak acidity, is favorable for leaching metal ions in the electrode material, the fulvic acid is used as a leaching agent, is easy to dissolve in water, the aqueous solution is acidic, contains multiple active groups of carboxyl and hydroxyl, has strong chelating ability for the metal ions, achieves good effect of treating two lithium battery anode materials when being used together, achieves more than 95% of recovery rate of each ion, realizes one-step recovery of the metal ions in the nickel cobalt lithium manganate powder and the lithium iron phosphate powder, simplifies the recovery process, and saves the cost.
Description
Technical Field
The invention relates to the technical field of recycling application of lithium ion batteries, in particular to a method for recycling heavy metals in a waste lithium battery anode material.
Background
The positive electrode material of the power lithium battery mainly comprises two materials, namely lithium iron phosphate and ternary material, and the lithium iron phosphate battery has high safety performance and is suitable for echelon utilization; the ternary material battery has certain risk, is not suitable for the field of gradient utilization of energy storage power stations, communication base station backup power supplies and the like, but the ternary positive electrode material has high recycling value, has higher nickel, cobalt and manganese content, has high recycling value, can refine renewable metals in the ternary positive electrode material through power battery recycling and related process treatment, can produce metal salts such as nickel sulfate, cobalt sulfate and manganese sulfate, and can also produce ternary precursors through processing treatment, so that higher added value is generated.
The patent document (CN 111252814A) discloses a recovery method of a waste ternary lithium ion battery anode material, which is characterized in that acid and a reducing agent are adopted for leaching ternary materials in the waste ternary lithium ion battery, then a precipitant and a complexing agent are added into a leaching solution to obtain a nickel cobalt manganese lithium coprecipitation precursor, and then the precursor is calcined at high temperature to obtain the nickel cobalt lithium manganate ternary material.
Patent document (CN 111218568A) provides a method for separating and recovering nickel and cobalt from waste lithium ion batteries, which comprises the steps of firstly disassembling a positive electrode material from the waste lithium ion batteries, then soaking the positive electrode material in a mixed solution of organic acid and a reducing agent, extracting a leaching solution to obtain a high nickel solution, and then washing and back-extracting to obtain a high cobalt solution, thereby realizing nickel and cobalt recovery from the waste lithium ion batteries. According to the method for separating and recycling nickel and cobalt from the waste lithium ion battery, disclosed by the invention, the waste lithium ion battery is recycled and hydrometallurgy is combined, and the acid leaching is performed by adopting the organic acid, so that the method is more environment-friendly and economical, has certain environmental benefit and economic benefit in the field of battery recycling, is efficient and feasible, is safe and reliable, has small secondary pollution, avoids the problem of secondary pollution caused by the traditional process, saves the recycling cost, and realizes the efficient recycling of resources.
At present, a method of firstly dissolving the waste lithium battery anode material by acid and then separating metal ions is mainly adopted for recycling, but the problems of complex process, low metal ion leaching rate and recycling of single waste lithium batteries only exist.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for recycling heavy metals in a waste nickel cobalt lithium manganate battery anode material, which solves the technical problems that the leaching rate of metal ions is low and only single type of waste lithium battery can be recycled in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for recycling heavy metals in a waste lithium battery anode material comprises the following steps:
(1) Respectively carrying out grading treatment on the waste nickel cobalt lithium manganate battery material and the lithium iron phosphate battery material to obtain a nickel cobalt lithium manganate positive electrode material and a lithium iron phosphate positive electrode material for standby;
(2) Separating positive active substances in the nickel cobalt lithium manganate positive electrode material and the lithium iron phosphate positive electrode material from a current collector aluminum foil by adopting a vacuum pyrolysis method, and cooling to obtain nickel cobalt lithium manganate powder and lithium iron phosphate powder;
(3) Adding nickel cobalt lithium manganate powder and lithium iron phosphate powder into a mixed acid solution of fulvic acid and ascorbic acid, dissolving and leaching, and filtering after leaching is finished to obtain filtrate;
(4) Regulating and controlling the content of lithium, nickel, cobalt, manganese and iron ions in the filtrate, adding ammonia water to regulate the pH value of the solution, drying and calcining to prepare the composite material, and then recycling.
Preferably, in the step (3), the mass ratio of the nickel cobalt lithium manganate powder to the lithium iron phosphate powder is 2-4:1.
Preferably, in the step (3), the solid-to-liquid ratio of the total mass of the nickel cobalt lithium manganate powder and the lithium iron phosphate powder to the mixed acid is 40-60g/L.
Preferably, in the step (3), the mass concentration of the fulvic acid is 10-15g/L, and the mass concentration of the ascorbic acid is 6-10g/L.
Preferably, in the step (3), the fulvic acid is a source fulvic acid.
Preferably, in the step (3), the dissolution temperature is 40-80 ℃ and the dissolution time is 40-60min.
Preferably, in the step (4), the Li, ni, co, mn, fe source for controlling the content is selected from at least one of Li, ni, co, mn, fe chloride, sulfate or nitrate.
The invention also provides an application of the mixed acid solution in recycling waste lithium battery anode materials, which comprises the following steps:
(1) Respectively carrying out grading treatment on the waste nickel cobalt lithium manganate battery material and the lithium iron phosphate battery material to obtain a nickel cobalt lithium manganate positive electrode material and a lithium iron phosphate positive electrode material for standby;
(2) Separating positive active substances in the nickel cobalt lithium manganate positive electrode material and the lithium iron phosphate positive electrode material from a current collector aluminum foil by adopting a vacuum pyrolysis method, and cooling to obtain nickel cobalt lithium manganate powder and lithium iron phosphate powder;
(3) Adding nickel cobalt lithium manganate powder and lithium iron phosphate powder into a mixed acid solution of fulvic acid and ascorbic acid, dissolving and leaching, and filtering after leaching is finished to obtain filtrate;
(4) Regulating and controlling the content of lithium, nickel, cobalt, manganese and iron ions in the filtrate, adding ammonia water to regulate the pH value of the solution, drying and calcining to prepare the composite material, and then recycling.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for recycling heavy metals in a waste nickel cobalt lithium manganate battery anode material, wherein in the waste nickel cobalt lithium manganate electrode material, metal ions mainly contained in the waste nickel cobalt lithium manganate electrode material are Li + ，Ni 2+ ，Ni 3+ ，Ni 4+ ，Co 3+ And Mn of 4+ The waste lithium iron phosphate electrode material mainly contains Fe 2+ ，Li + The method comprises the steps of carrying out a first treatment on the surface of the The invention creatively uses ascorbic acid and fulvic acid as mixed acid solution to simultaneously recycle two different lithium ion battery anode materials in one step, and the ascorbic acid releases H in aqueous solution + The method has weak acidity, is favorable for leaching metal ions in the electrode material, the fulvic acid is used as a leaching agent, is easy to dissolve in water, the aqueous solution is acidic, the fulvic acid contains a plurality of active groups of carboxyl and hydroxyl, has strong chelating ability for the metal ions, achieves good effect of treating two lithium battery anode materials when being used together, achieves the recovery rate of each ion to more than 95 percent, realizes one-step recovery of the metal ions in the nickel cobalt lithium manganate powder and the lithium iron phosphate powder,the recovery process is simplified, and the cost is saved.
Detailed Description
The present invention will be described in further detail with reference to the following preferred examples, but the present invention is not limited to the following examples.
Unless otherwise specified, the chemical reagents involved in the present invention are all commercially available.
The fulvic acid used in the invention is the fulvic acid purified by ion exchange resin, wherein the crude fulvic acid is purchased from Henan Changsheng Kogyo Co.
The lithium nickel cobalt manganate powder and the lithium iron phosphate powder used in the examples and comparative examples of the present invention were the same batch.
Example 1
A method for recycling heavy metals in a waste lithium battery anode material comprises the following steps:
(1) Respectively carrying out grading treatment on the waste nickel cobalt lithium manganate battery material and the lithium iron phosphate battery material to obtain a nickel cobalt lithium manganate positive electrode material and a lithium iron phosphate positive electrode material for standby;
(2) Separating positive active substances in the nickel cobalt lithium manganate positive electrode material and the lithium iron phosphate positive electrode material from a current collector aluminum foil respectively at 600 ℃ by adopting a vacuum pyrolysis method, and cooling to obtain nickel cobalt lithium manganate powder and lithium iron phosphate powder;
(3) Adding 20g of nickel cobalt lithium manganate powder and 6g of lithium iron phosphate powder into 500mL of mixed acid solution (5 g of mining source fulvic acid and 3g of ascorbic acid), dissolving and leaching at 50 ℃ for 40min, and filtering to obtain filtrate after leaching is finished;
(4) Analyzing the content of lithium, nickel, cobalt, manganese and iron in the filtrate, regulating and controlling according to the content requirements of each component, enabling the molar ratio of the lithium, nickel, cobalt, manganese and iron to be 3.05:1:1:1:0.03, enabling the total concentration of metal ions to be 1.0mol/L, adding ammonia water to adjust the pH value of a solution to be 8.0, heating to 80 ℃, stirring to form gel, drying the gel at 120 ℃ for 24 hours to form xerogel, presintering the xerogel at 400 ℃ for 2 hours in a muffle furnace, calcining at 650 ℃, 750 ℃ and 850 ℃ for 2 hours respectively, cooling, grinding uniformly, and obtaining the prepared composite material, and recycling.
Example 2
A method for recycling heavy metals in a waste lithium battery anode material comprises the following steps:
(1) Respectively carrying out grading treatment on the waste nickel cobalt lithium manganate battery material and the lithium iron phosphate battery material to obtain a nickel cobalt lithium manganate positive electrode material and a lithium iron phosphate positive electrode material for standby;
(2) Separating positive active substances in the nickel cobalt lithium manganate positive electrode material and the lithium iron phosphate positive electrode material from a current collector aluminum foil respectively at 600 ℃ by adopting a vacuum pyrolysis method, and cooling to obtain nickel cobalt lithium manganate powder and lithium iron phosphate powder;
(3) Adding 20g of nickel cobalt lithium manganate powder and 6g of lithium iron phosphate powder into 500mL of mixed acid solution (6 g of mining source fulvic acid and 4g of ascorbic acid), dissolving and leaching for 50min at 40 ℃, and filtering to obtain filtrate after leaching is finished;
(4) Analyzing the content of lithium, nickel, cobalt, manganese and iron in the filtrate, regulating and controlling according to the content requirements of each component, enabling the molar ratio of the lithium, nickel, cobalt, manganese and iron to be 3.05:1:1:1:0.03, enabling the total concentration of metal ions to be 1.0mol/L, adding ammonia water to adjust the pH value of a solution to be 8.0, heating to 80 ℃, stirring to form gel, drying the gel at 120 ℃ for 24 hours to form xerogel, presintering the xerogel at 400 ℃ for 2 hours in a muffle furnace, calcining at 650 ℃, 750 ℃ and 850 ℃ for 2 hours respectively, cooling, grinding uniformly, and preparing the composite material for reuse.
Example 3
A method for recycling heavy metals in a waste lithium battery anode material comprises the following steps:
(1) Respectively carrying out grading treatment on the waste nickel cobalt lithium manganate battery material and the lithium iron phosphate battery material to obtain a nickel cobalt lithium manganate positive electrode material and a lithium iron phosphate positive electrode material for standby;
(2) Separating positive active substances in the nickel cobalt lithium manganate positive electrode material and the lithium iron phosphate positive electrode material from a current collector aluminum foil respectively at 600 ℃ by adopting a vacuum pyrolysis method, and cooling to obtain nickel cobalt lithium manganate powder and lithium iron phosphate powder;
(3) Adding 20g of nickel cobalt lithium manganate powder and 6g of lithium iron phosphate powder into 500mL of mixed acid solution (6.5 g of mining source fulvic acid and 4.5g of ascorbic acid), dissolving and leaching at 40 ℃ for 50min, and filtering to obtain filtrate after leaching is finished;
(4) Analyzing the content of lithium, nickel, cobalt, manganese and iron in the filtrate, regulating and controlling according to the content requirements of each component, enabling the molar ratio of the lithium, nickel, cobalt, manganese and iron to be 3.05:1:1:1:0.03, enabling the total concentration of metal ions to be 1.0mol/L, adding ammonia water to adjust the pH value of a solution to be 8.0, heating to 80 ℃, stirring to form gel, drying the gel at 120 ℃ for 24 hours to form xerogel, presintering the xerogel at 400 ℃ for 2 hours in a muffle furnace, calcining at 650 ℃, 750 ℃ and 850 ℃ for 2 hours respectively, cooling, grinding uniformly, and preparing the composite material for reuse.
Example 4
A method for recycling heavy metals in a waste lithium battery anode material comprises the following steps:
(1) Respectively carrying out grading treatment on the waste nickel cobalt lithium manganate battery material and the lithium iron phosphate battery material to obtain a nickel cobalt lithium manganate positive electrode material and a lithium iron phosphate positive electrode material for standby;
(2) Separating positive active substances in the nickel cobalt lithium manganate positive electrode material and the lithium iron phosphate positive electrode material from a current collector aluminum foil respectively at 600 ℃ by adopting a vacuum pyrolysis method, and cooling to obtain nickel cobalt lithium manganate powder and lithium iron phosphate powder;
(3) Adding 20g of nickel cobalt lithium manganate powder and 6g of lithium iron phosphate powder into 500mL of mixed acid solution (7 g of mining source fulvic acid and 5g of ascorbic acid), dissolving and leaching at 60 ℃ for 60min, and filtering to obtain filtrate after leaching is finished;
(4) Analyzing the content of lithium, nickel, cobalt, manganese and iron in the filtrate, regulating and controlling according to the content requirements of each component, enabling the molar ratio of the lithium, nickel, cobalt, manganese and iron to be 3.05:1:1:1:0.03, enabling the total concentration of metal ions to be 1.0mol/L, adding ammonia water to adjust the pH value of a solution to be 8.0, heating to 80 ℃, stirring to form gel, drying the gel at 120 ℃ for 24 hours to form xerogel, presintering the xerogel at 400 ℃ for 2 hours in a muffle furnace, calcining at 650 ℃, 750 ℃ and 850 ℃ for 2 hours respectively, cooling, grinding uniformly, and preparing the composite material for reuse.
Comparative example 1
A method for recycling heavy metals in a waste lithium battery anode material comprises the following steps:
(1) Respectively carrying out grading treatment on the waste nickel cobalt lithium manganate battery material and the lithium iron phosphate battery material to obtain a nickel cobalt lithium manganate positive electrode material and a lithium iron phosphate positive electrode material for standby;
(2) Separating positive active substances in the nickel cobalt lithium manganate positive electrode material and the lithium iron phosphate positive electrode material from a current collector aluminum foil respectively at 600 ℃ by adopting a vacuum pyrolysis method, and cooling to obtain nickel cobalt lithium manganate powder and lithium iron phosphate powder;
(3) Adding 20g of nickel cobalt lithium manganate powder and 6g of lithium iron phosphate powder into 500mL of 6g of ore source fulvic acid solution, dissolving and leaching for 50min at 40 ℃, and filtering to obtain filtrate after leaching is finished;
(4) Analyzing the content of lithium, nickel, cobalt, manganese and iron in the filtrate, regulating and controlling according to the content requirements of each component, enabling the molar ratio of the lithium, nickel, cobalt, manganese and iron to be 3.05:1:1:1:0.03, enabling the total concentration of metal ions to be 1.0mol/L, adding ammonia water to adjust the pH value of a solution to be 8.0, heating to 80 ℃, stirring to form gel, drying the gel at 120 ℃ for 24 hours to form xerogel, presintering the xerogel at 400 ℃ for 2 hours in a muffle furnace, calcining at 650 ℃, 750 ℃ and 850 ℃ for 2 hours respectively, cooling, grinding uniformly, and preparing the composite material for reuse.
Comparative example 2
A method for recycling heavy metals in a waste lithium battery anode material comprises the following steps:
(1) Respectively carrying out grading treatment on the waste nickel cobalt lithium manganate battery material and the lithium iron phosphate battery material to obtain a nickel cobalt lithium manganate positive electrode material and a lithium iron phosphate positive electrode material for standby;
(2) Separating positive active substances in the nickel cobalt lithium manganate positive electrode material and the lithium iron phosphate positive electrode material from a current collector aluminum foil respectively at 600 ℃ by adopting a vacuum pyrolysis method, and cooling to obtain nickel cobalt lithium manganate powder and lithium iron phosphate powder;
(3) Adding 20g of nickel cobalt lithium manganate powder and 6g of lithium iron phosphate powder into 500mL of an ascorbic acid solution of 6g, dissolving and leaching for 50min at 40 ℃, and filtering to obtain a filtrate after leaching is finished;
(4) Analyzing the content of lithium, nickel, cobalt, manganese and iron in the filtrate, regulating and controlling according to the content requirements of each component, enabling the molar ratio of the lithium, nickel, cobalt, manganese and iron to be 3.05:1:1:1:0.03, enabling the total concentration of metal ions to be 1.0mol/L, adding ammonia water to adjust the pH value of a solution to be 8.0, heating to 80 ℃, stirring to form gel, drying the gel at 120 ℃ for 24 hours to form xerogel, presintering the xerogel at 400 ℃ for 2 hours in a muffle furnace, calcining at 650 ℃, 750 ℃ and 850 ℃ for 2 hours respectively, cooling, grinding uniformly, and preparing the composite material for reuse.
The filtrates obtained in step (3) of examples 1-4 and comparative examples 1-2 were subjected to a metal ion leaching rate test, specifically as follows: weighing 20g of nickel cobalt lithium manganate powder, adding 500mL of aqua regia for dissolution to obtain a leaching solution, diluting the leaching solution by 100 times, measuring the concentration of each metal ion in the leaching solution by using inductively coupled plasma emission spectroscopy (ICP-OES), and marking as C 0 The filtrates obtained in examples 1-4 and comparative examples 1-2 were diluted 100 times, respectively, and the concentration of each metal ion in the filtrate was measured by ICP-OES and designated as C 1 Calculating the leaching rate n=c of the metal 1 /C 0 The experimental results obtained are shown in the following table:
| example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | |
| Li extraction Rate (%) | 99.36 | 99.57 | 99.28 | 99.63 | 91.20 | 86.62 |
| Ni leaching yield (%) | 97.87 | 98.06 | 98.15 | 97.94 | 81.24 | 63.45 |
| Co leaching Rate (%) | 97.23 | 96.98 | 96.89 | 97.12 | 76.08 | 71.93 |
| Mn leaching Rate (%) | 99.86 | 99.93 | 99.69 | 99.91 | 72.35 | 63.87 |
| Fe leaching efficiency (%) | 95.46 | 95.78 | 95.19 | 96.01 | 83.24 | 72.32 |
As can be seen from the table, in the present example, when the mixed acid of fulvic acid and ascorbic acid is used to leach out metal ions, the leaching rate of Li and Mn is over 99%, the leaching rate of Ni is 98%, the leaching rate of Co is 97%, the leaching rate of Fe is 95%, no ascorbic acid is added in comparative example 1, no fulvic acid is added in comparative example 2, and the leaching rates of metal ions in comparative example 1 and comparative example 2 are both poor.
Finally, it should be noted that: the above examples are not intended to limit the present invention in any way. Modifications and improvements will readily occur to those skilled in the art upon the basis of the present invention. Accordingly, any modification or improvement made without departing from the spirit of the invention is within the scope of the invention as claimed.
Claims (8)
1. The method for recycling heavy metal in the waste lithium battery anode material is characterized by comprising the following steps of:
(1) Respectively carrying out grading treatment on the waste nickel cobalt lithium manganate battery material and the lithium iron phosphate battery material to obtain a nickel cobalt lithium manganate positive electrode material and a lithium iron phosphate positive electrode material for standby;
(2) Separating positive active substances in the nickel cobalt lithium manganate positive electrode material and the lithium iron phosphate positive electrode material from a current collector aluminum foil by adopting a vacuum pyrolysis method, and cooling to obtain nickel cobalt lithium manganate powder and lithium iron phosphate powder;
(3) Adding nickel cobalt lithium manganate powder and lithium iron phosphate powder into a mixed acid solution of fulvic acid and ascorbic acid together, dissolving and leaching, and filtering after leaching is finished to obtain filtrate;
(4) Regulating and controlling the content of lithium, nickel, cobalt, manganese and iron ions in the filtrate, adding ammonia water to regulate the pH value of the solution, drying and calcining to prepare the composite material, and then recycling.
2. The method for recycling heavy metals in the waste lithium battery anode material according to claim 1, wherein in the step (3), the mass ratio of the nickel cobalt lithium manganate powder to the lithium iron phosphate powder is 2-4:1.
3. The method for recycling heavy metals in the waste lithium battery anode material according to claim 1, wherein in the step (3), the solid-liquid ratio of the total mass of the nickel cobalt lithium manganate powder and the lithium iron phosphate powder to the mixed acid is 40-60g/L.
4. The method for recycling heavy metals in the waste lithium battery anode material according to claim 1, wherein in the step (3), the mass concentration of fulvic acid is 10-15g/L, and the mass concentration of ascorbic acid is 6-10g/L.
5. The method for recycling heavy metals in the waste lithium battery anode material according to claim 1, wherein in the step (3), the fulvic acid is a mining source fulvic acid.
6. The method for recycling heavy metals in the waste lithium battery anode material according to claim 1, wherein in the step (3), the dissolution temperature is 40-80 ℃ and the dissolution time is 40-60min.
7. The method for recycling heavy metals in waste lithium battery cathode materials according to claim 1, wherein in the step (4), the Li, ni, co, mn, fe source for controlling the content is at least one selected from Li, ni, co, mn, fe chloride, sulfate or nitrate.
8. The application of the mixed acid solution in recycling waste lithium battery anode materials is characterized by comprising the following steps:
(1) Respectively carrying out grading treatment on the waste nickel cobalt lithium manganate battery material and the lithium iron phosphate battery material to obtain a nickel cobalt lithium manganate positive electrode material and a lithium iron phosphate positive electrode material for standby;
(2) Separating positive active substances in the nickel cobalt lithium manganate positive electrode material and the lithium iron phosphate positive electrode material from a current collector aluminum foil by adopting a vacuum pyrolysis method, and cooling to obtain nickel cobalt lithium manganate powder and lithium iron phosphate powder;
(3) Adding nickel cobalt lithium manganate powder and lithium iron phosphate powder into a mixed acid solution of fulvic acid and ascorbic acid, dissolving and leaching, and filtering after leaching is finished to obtain filtrate;
(4) Regulating and controlling the content of lithium, nickel, cobalt, manganese and iron ions in the filtrate, adding ammonia water to regulate the pH value of the solution, drying and calcining to prepare the composite material, and then recycling.
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| CN202111175610.1A CN113921928B (en) | 2021-10-09 | 2021-10-09 | Method for recycling heavy metal in waste lithium battery anode material |
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