CN114421040A - Method for recovering lithium from waste lithium ion battery - Google Patents
Method for recovering lithium from waste lithium ion battery Download PDFInfo
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- CN114421040A CN114421040A CN202111674223.2A CN202111674223A CN114421040A CN 114421040 A CN114421040 A CN 114421040A CN 202111674223 A CN202111674223 A CN 202111674223A CN 114421040 A CN114421040 A CN 114421040A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 27
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 23
- 239000002699 waste material Substances 0.000 title claims abstract description 23
- 238000002386 leaching Methods 0.000 claims abstract description 28
- 239000002253 acid Substances 0.000 claims abstract description 17
- 239000003513 alkali Substances 0.000 claims abstract description 16
- 238000001556 precipitation Methods 0.000 claims abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 25
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 24
- 239000002244 precipitate Substances 0.000 claims description 24
- QXZUUHYBWMWJHK-UHFFFAOYSA-N [Co].[Ni] Chemical compound [Co].[Ni] QXZUUHYBWMWJHK-UHFFFAOYSA-N 0.000 claims description 21
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 14
- 229910000361 cobalt sulfate Inorganic materials 0.000 claims description 12
- 229940044175 cobalt sulfate Drugs 0.000 claims description 12
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 claims description 12
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims description 12
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims description 12
- 239000011259 mixed solution Substances 0.000 claims description 9
- 235000021110 pickles Nutrition 0.000 claims description 9
- 238000004064 recycling Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- PFYQFCKUASLJLL-UHFFFAOYSA-N [Co].[Ni].[Li] Chemical group [Co].[Ni].[Li] PFYQFCKUASLJLL-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 6
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 6
- IPJKJLXEVHOKSE-UHFFFAOYSA-L manganese dihydroxide Chemical compound [OH-].[OH-].[Mn+2] IPJKJLXEVHOKSE-UHFFFAOYSA-L 0.000 claims description 6
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 229910001431 copper ion Inorganic materials 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 229960004887 ferric hydroxide Drugs 0.000 claims description 3
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000004073 vulcanization Methods 0.000 claims description 3
- 238000010979 pH adjustment Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 239000013543 active substance Substances 0.000 abstract description 5
- 239000011888 foil Substances 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 3
- 238000002791 soaking Methods 0.000 abstract description 3
- 239000002351 wastewater Substances 0.000 abstract description 3
- 239000010405 anode material Substances 0.000 abstract description 2
- 239000011889 copper foil Substances 0.000 abstract description 2
- 239000007772 electrode material Substances 0.000 abstract description 2
- 150000002739 metals Chemical class 0.000 abstract description 2
- 238000006386 neutralization reaction Methods 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 abstract description 2
- 230000001376 precipitating effect Effects 0.000 abstract 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000197 pyrolysis Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 239000010926 waste battery Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/54—Reclaiming serviceable parts of waste accumulators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for recovering lithium from waste lithium ion batteries, which comprises the steps of pre-soaking with alkali to remove aluminum, then soaking with dilute acid solution to destroy the adhesion of organic matters and copper foils, separating aluminum foils because the anode material of the lithium ion battery can not be dissolved in alkali solution and the substrate aluminum foil can be dissolved in alkali solution, respectively treating the separated solution and alkali leaching residues, respectively separating active substances from a current collector because most of the anode active substances in the lithium ion battery can be dissolved in acid, then leaching the electrode material in the alkali leaching residues with acid solution, and then precipitating and purifying target metals by combining the principle of neutralization reaction, thereby achieving the purpose of recovering high-purity components, fully recovering each effective component in the lithium ion battery waste by adopting a step-by-step precipitation mode, not increasing other harmful impurities in the process, and not generating harmful gas in the whole process flow, the waste water to be discharged is simple to treat and is environment-friendly.
Description
Technical Field
The invention relates to the technical field of waste battery recovery methods, in particular to a method for recovering lithium from waste lithium ion batteries.
Background
The power storage battery is a power supply for providing a power source for the tool, and is a storage battery for providing power for electric automobiles, electric trains, electric bicycles and golf carts. It is mainly distinguished from a starting battery for starting an automobile engine. Valve-port sealed lead-acid batteries, open tubular lead-acid batteries and lithium iron phosphate batteries are mostly used.
With the rapid development of new energy automobile industry in China, China has become the largest energy automobile consumption market and the production and consumption countries of power storage batteries in the world. In 2018, the production and marketing of new energy automobiles in China are respectively finished by 127.0 ten thousand and 125.6 ten thousand, the year by year is respectively increased by 59.9 percent and 61.7 percent, and the quantity of new energy automobiles in China is up to 261 ten thousand. In 2018, the matching amount of the power storage battery in China reaches 56.9GWH, and the equivalent increase is 56.3%.
The lithium iron phosphate battery has a relatively rapid development, and in terms of different battery types, the valuable metal contained in the lithium iron phosphate battery is mainly lithium, and the battery generally adopts a material containing a lithium element as an electrode, which is representative of modern high-performance batteries. The traditional technology for recycling metal lithium in a power storage battery generally adopts physical disassembly and then crushing for physical pyrolysis, and the high-temperature pyrolysis refers to the step of carrying out high-temperature roasting decomposition on a lithium battery material subjected to primary separation treatment such as physical crushing and the like, and removing an organic binder, so that the constituent materials of the lithium battery are separated. Meanwhile, the metal and the compound thereof in the lithium battery can be oxidized, reduced and decomposed, volatilized in a steam form, and then collected by condensation and other methods. The high-temperature pyrolysis treatment technology has the advantages of simple process, convenient operation, high reaction speed and high efficiency in a high-temperature environment, can effectively remove the adhesive, has low requirements on the components of the raw materials, and is more suitable for treating a large number of or more complicated batteries. However, the method has high requirements on equipment, and in the treatment process, the decomposition of organic matters in the battery can generate harmful gas, so that the method is not environment-friendly, and purification and recovery equipment is required to be added to absorb and purify the harmful gas so as to prevent secondary pollution. Therefore, the process cost is high.
Therefore, there is a need to develop a method for recovering lithium from waste lithium ion batteries, which solves the problems associated with the conventional method for recovering lithium from waste lithium ion batteries.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for recovering lithium from waste lithium ion batteries, which comprises the following steps:
s1, collecting lithium ion battery waste, and performing alkaline leaching treatment on the lithium ion battery waste to obtain sodium metaaluminate solution and alkaline leaching residues;
s2, carrying out pH adjustment on the alkaline leaching residue obtained in the step S1 by using sulfuric acid to obtain acid leaching solution and acid leaching residue;
s3, adjusting the pH value of the pickle liquor in S2 to 1, adding iron powder for reduction, stirring and maintaining the pH value of a solution system of the pickle liquor to 1 until copper ions are completely replaced to generate sponge copper, and filtering the sponge copper;
s4, based on S3, adjusting the pH value of the filtered pickle liquor to 3.6 to precipitate ferric hydroxide, and filtering and separating to obtain filtrate, wherein the filtrate is lithium cobalt nickel solution;
s5, adjusting the pH value of the lithium cobalt nickel solution in the S4 to 1, performing vulcanization precipitation to obtain a precipitation tail liquid and a nickel cobalt precipitate, filtering and separating, and recovering the nickel cobalt precipitate;
s6, adjusting the pH value of the precipitation tail liquid to 8.5 by using liquid alkali, performing alkali precipitation to obtain manganese hydroxide crystals and a lithium hydroxide solution, filtering and separating, and recovering manganese hydroxide;
and S7, adding excessive sodium carbonate into the lithium hydroxide solution obtained after filtration to react to obtain lithium carbonate precipitate, and drying to recover the lithium carbonate.
Preferably, the recycling of the nickel cobalt precipitate in the step S5 includes the following steps:
s8, adding sulfuric acid into the separated nickel-cobalt precipitate for dissolving, and filtering to obtain a mixed solution of nickel sulfate and cobalt sulfate;
s9, extracting the mixed solution of nickel sulfate and cobalt sulfate respectively, separating and purifying the solvent layer to obtain crystals of nickel sulfate and cobalt sulfate, and directly returning the extraction raffinate to the step S2 for circulation.
Preferably, the step S9 of extracting the mixed solution of nickel sulfate and cobalt sulfate separately is to perform fractional extraction by using a P204 extractant and a P507 extractant.
Preferably, in step S8, the nickel cobalt precipitate is dissolved by using sulfuric acid with a concentration of 1.0mol/L, and the reaction is performed at a temperature of 80 ℃ for 2 hours until the nickel cobalt precipitate is completely dissolved.
Preferably, in step S8, when the nickel cobalt precipitate is dissolved by the sulfuric acid, the solid-to-liquid ratio is 5: 1.
Preferably, the acid leaching residue in the step S2 is graphite, and the collected graphite is continuously added into the alkali leaching residue for recycling.
Compared with the prior art, the invention has the following beneficial effects:
(1) when the invention recovers cobalt and lithium in the battery, aluminum is removed by alkali leaching in advance, then dilute acid solution is used for soaking to destroy the adhesion of organic matters and copper foil, because the anode material of the lithium ion battery can not be dissolved in alkali solution, and the substrate aluminum foil can be dissolved in alkali solution, the invention is used for separating aluminum foil, the separated solution and the alkaline leaching residue are respectively treated, the alkaline leaching residue contains metals such as lithium, cobalt and nickel, and most of the anode active substances in the lithium ion battery can be dissolved in acid, then the electrode material in the alkaline leaching residue is leached by acid solution, the separation of the active substances and the current collector is realized, and the target metal is precipitated and purified by combining the principle of neutralization reaction, thereby achieving the purpose of recovering high-purity components, and fully recovering each effective component in the lithium ion battery waste by adopting the mode of fractional precipitation, and not adding other harmful impurities in the process, and the whole process flow can not generate harmful gas, the treatment of the waste water to be discharged is simpler and environment-friendly, and the process can be used for recycling and can be suitable for recycling various lithium batteries.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, a method for recovering lithium from a waste lithium ion battery includes the following steps:
s1, collecting lithium ion battery waste, and performing alkaline leaching treatment on the lithium ion battery waste to obtain sodium metaaluminate solution and alkaline leaching residues;
s2, adjusting the pH of the alkaline leaching residue obtained in the step S1 by using sulfuric acid to obtain acid leaching liquid and acid leaching residue, wherein the acid leaching residue is graphite, and collecting the graphite to be continuously put into the alkaline leaching residue for recycling;
s3, adjusting the pH value of the pickle liquor in S2 to 1, adding iron powder for reduction, stirring and maintaining the pH value of a solution system of the pickle liquor to 1 until copper ions are completely replaced to generate sponge copper, and filtering the sponge copper;
s4, based on S3, adjusting the pH value of the filtered pickle liquor to 3.6 to precipitate ferric hydroxide, and filtering and separating to obtain filtrate, wherein the filtrate is lithium cobalt nickel solution;
s5, adjusting the pH value of the lithium cobalt nickel solution in the S4 to 1, performing vulcanization precipitation to obtain a precipitation tail liquid and a nickel cobalt precipitate, filtering and separating, and recovering the nickel cobalt precipitate;
s6, adjusting the pH value of the precipitation tail liquid to 8.5 by using liquid alkali, performing alkali precipitation to obtain manganese hydroxide crystals and a lithium hydroxide solution, filtering and separating, and recovering manganese hydroxide;
and S7, adding excessive sodium carbonate into the lithium hydroxide solution obtained after filtration to react to obtain lithium carbonate precipitate, and drying to recover the lithium carbonate.
In step S5, the method for recycling nickel cobalt precipitate includes the following steps:
s8, adding sulfuric acid into the separated nickel-cobalt precipitate for dissolving, and filtering to obtain a mixed solution of nickel sulfate and cobalt sulfate;
s9, extracting the mixed solution of nickel sulfate and cobalt sulfate respectively, separating and purifying the solvent layer to obtain crystals of nickel sulfate and cobalt sulfate, separating the active substance from the current collector, recovering high-purity components, and directly returning the extraction residual liquid to the step S2 for circulation.
The step S9 of extracting the mixed solution of nickel sulfate and cobalt sulfate separately is to perform stepwise extraction using a P204 extractant and a P507 extractant.
In step S8, the nickel cobalt precipitate is dissolved with sulfuric acid with a concentration of 1.0mol/L, and the reaction is carried out at 80 ℃ for 2 hours until the nickel cobalt precipitate is completely dissolved, wherein the solid-to-liquid ratio is 5:1 when the nickel cobalt precipitate is dissolved with sulfuric acid.
The method adopts a step-by-step precipitation mode, fully recovers all effective components in the lithium ion battery waste, does not increase other harmful impurities in the process, does not generate harmful gas in the whole process flow, is simple and environment-friendly to the treatment of the waste water needing to be discharged, and can be suitable for the recovery of various lithium batteries by the process.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and therefore, modifications, equivalent changes, improvements, etc. made in the claims of the present invention are still included in the scope of the present invention.
Claims (6)
1. A method for recovering lithium from waste lithium ion batteries is characterized by comprising the following steps:
s1, collecting lithium ion battery waste, and performing alkaline leaching treatment on the lithium ion battery waste to obtain sodium metaaluminate solution and alkaline leaching residues;
s2, carrying out pH adjustment on the alkaline leaching residue obtained in the step S1 by using sulfuric acid to obtain acid leaching solution and acid leaching residue;
s3, adjusting the pH value of the pickle liquor in S2 to 1, adding iron powder for reduction, stirring and maintaining the pH value of a solution system of the pickle liquor to 1 until copper ions are completely replaced to generate sponge copper, and filtering the sponge copper;
s4, based on S3, adjusting the pH value of the filtered pickle liquor to 3.6 to precipitate ferric hydroxide, and filtering and separating to obtain filtrate, wherein the filtrate is lithium cobalt nickel solution;
s5, adjusting the pH value of the lithium cobalt nickel solution in the S4 to 1, performing vulcanization precipitation to obtain a precipitation tail liquid and a nickel cobalt precipitate, filtering and separating, and recovering the nickel cobalt precipitate;
s6, adjusting the pH value of the precipitation tail liquid to 8.5 by using liquid alkali, performing alkali precipitation to obtain manganese hydroxide crystals and a lithium hydroxide solution, filtering and separating, and recovering manganese hydroxide;
and S7, adding excessive sodium carbonate into the lithium hydroxide solution obtained after filtration to react to obtain lithium carbonate precipitate, and drying to recover the lithium carbonate.
2. The method for recovering lithium from waste lithium ion batteries according to claim 1, wherein the method comprises the following steps: the step S5 of recycling the nickel cobalt precipitate includes the following steps:
s8, adding sulfuric acid into the separated nickel-cobalt precipitate for dissolving, and filtering to obtain a mixed solution of nickel sulfate and cobalt sulfate;
s9, extracting the mixed solution of nickel sulfate and cobalt sulfate respectively, separating and purifying the solvent layer to obtain crystals of nickel sulfate and cobalt sulfate, and directly returning the extraction raffinate to the step S2 for circulation.
3. The method for recovering lithium from waste lithium ion batteries according to claim 2, characterized in that: the step S9 of separately extracting the mixed solution of nickel sulfate and cobalt sulfate is to perform step-by-step extraction using a P204 extractant and a P507 extractant.
4. The method for recovering lithium from waste lithium ion batteries according to claim 2 or 3, characterized in that: in the step S8, the nickel cobalt precipitate is dissolved by using sulfuric acid with a concentration of 1.0mol/L, and the reaction is performed at a temperature of 80 ℃ for 2 hours until the nickel cobalt precipitate is completely dissolved.
5. The method for recovering lithium from waste lithium ion batteries according to claim 4, wherein the method comprises the following steps: in step S8, when the nickel cobalt precipitate is dissolved in the sulfuric acid, the solid-to-liquid ratio is 5: 1.
6. The method for recovering lithium from waste lithium ion batteries according to claim 1, wherein the method comprises the following steps: and (4) the acid leaching residue in the step S2 is graphite, and the collected graphite is continuously put into the alkali leaching residue for recycling.
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