CN110760686A - 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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- CN110760686A CN110760686A CN201911284241.2A CN201911284241A CN110760686A CN 110760686 A CN110760686 A CN 110760686A CN 201911284241 A CN201911284241 A CN 201911284241A CN 110760686 A CN110760686 A CN 110760686A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/007—Wet processes by acid leaching
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
- C22B1/06—Sulfating roasting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/10—Obtaining alkali metals
- C22B26/12—Obtaining lithium
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- 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
Abstract
The invention relates to a method for recovering lithium from waste lithium ion batteries, which comprises the following steps: s1 preparation of an acidified material: mixing the positive electrode powder obtained from the waste lithium ion battery with concentrated sulfuric acid, and mixing lithium with H2SO4The molar ratio of (1: 0.5) - (1: 0.6), and uniformly grinding to obtain an acidified material; s2 high-temperature roasting: roasting the acidized material at the temperature of 450-550 ℃ to obtain a roasted material; s3 leaching and lithium extraction: adding water into the roasted material according to the solid-to-liquid ratio of 1:2-3, stirring for reaction, and carrying out solid-liquid separation to obtain a leaching solution and nickel-cobalt-manganese slag; s4 alkalization and impurity removal: adding inorganic base into the leachate, adjusting the pH value of the leachate to 12-13, stirring for reaction, carrying out solid-liquid separation, and retaining a filtrate, wherein the filtrate is lithium-containing purified liquid; s5 evaporation concentration: to contain lithiumEvaporating and concentrating the purified solution until the concentration of Li ions in the mother solution is 25-35g/L to obtain a lithium-containing concentrated solution; s6 precipitation of lithium from soda ash: and adding a sodium carbonate solution into the lithium-containing concentrated solution, reacting, then centrifugally separating and precipitating, washing and drying the precipitate to obtain the battery-grade lithium carbonate with the purity of more than 99.6 percent.
Description
Technical Field
The invention relates to the technical field of waste lithium battery recovery, in particular to a method for recovering lithium from waste lithium batteries.
Background
The lithium ion battery has excellent performances of high voltage, high cycle, high capacity, good thermal stability and the like, and has been widely applied, but after the lithium ion battery is subjected to multiple charge-discharge cycles, the active material is inactivated and scrapped due to structural change, so that the number of retired and abandoned lithium ion batteries is huge. The anode materials of lithium ion batteries in the current market are mainly ternary materials such as lithium cobaltate, lithium manganate, lithium iron phosphate and nickel cobalt manganese.
The waste lithium ion battery recovery method mainly focuses on a wet process and a fire process, and mainly recovers valuable metal elements. Wherein, the pyrogenic process has high energy consumption, serious pollution and poor separation effect; the wet method has the advantages of mild condition, low energy consumption and the like. At present, the recovery of nickel, cobalt and manganese metals in lithium ion batteries by a wet method is industrialized, but the research on the recovery technology of lithium is still immature, and the lithium recovery methods reported in domestic and foreign literature patents mainly comprise the following steps: (1) the main stream technology is to leach lithium-containing waste materials in an acid dissolving mode, extract impurities and extract metal nickel, cobalt and manganese, lithium is left in raffinate, and the raffinate is precipitated with sodium carbonate to obtain lithium carbonate; (2) patent CN106505225A discloses a method for preparing battery-grade lithium carbonate by recovering lithium from lithium waste batteries. The method mainly comprises the working procedures of acidification leaching, chemical impurity removal, lithium fluoride precipitation, magnesium salt transformation, alkalization impurity removal, sodium carbonate lithium precipitation and the like to obtain a final product. According to the process, sodium fluoride is consumed greatly in the step of lithium fluoride precipitation, metals such as nickel, cobalt, manganese and the like are subjected to coprecipitation, and meanwhile, a large amount of magnesium fluoride slag is generated in the step of magnesium salt transformation, so that the recovery rate of valuable metals is seriously influenced. (3) Patent CN107828996A discloses a comprehensive recovery method of ternary lithium ion battery positive electrode material. The method comprises the working procedures of acidification leaching, chemical impurity removal, precipitation of nickel, cobalt and manganese by adding alkali, evaporation concentration, precipitation of lithium by pure alkali and the like to obtain a final product. The method has the advantages that the consumption of alkali is high in the nickel, cobalt and manganese precipitation step, the nickel, cobalt and manganese precipitation is difficult to filter and separate, and meanwhile, the precipitation can carry partial lithium ions, so that the recovery rate of lithium is influenced. The technical problems encountered by the conventional recovery of the lithium of the waste lithium ion battery mainly include low recovery rate of the lithium, high consumption of auxiliary materials, high loss of nickel, cobalt and manganese, high impurities of lithium products and the like.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a method for recovering lithium from waste lithium ion batteries, which has the advantages of low auxiliary material consumption, basically no loss of nickel, cobalt and manganese, high lithium recovery rate and low lithium carbonate impurity content, and is suitable for industrial production.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a method for recovering lithium from waste lithium ion batteries comprises the following steps:
s1: preparing an acidizing material: mixing the anode powder obtained from the waste lithium ion battery with concentrated sulfuric acid, and leading lithium and H in the anode powder2SO4The molar ratio of (1: 0.5) - (1: 0.6), and uniformly grinding to obtain an acidified material;
s2: and (3) high-temperature roasting: roasting the acidified material obtained in the step S1 at the temperature of 450-550 ℃ to obtain a roasted material;
s3: leaching and lithium extraction: adding water into the roasting material obtained in the step S2 according to the solid-to-liquid ratio of 1:2-3, stirring for reaction, and carrying out solid-liquid separation to obtain a leaching solution and nickel-cobalt-manganese slag;
s4: alkalization and impurity removal: adding inorganic base into the leachate obtained in the step S3, adjusting the pH value of the leachate to 12-13, stirring for reaction, carrying out solid-liquid separation, and retaining a filtrate, wherein the filtrate is lithium-containing purified liquid;
s5: and (3) evaporation and concentration: evaporating and concentrating the lithium-containing purified liquid obtained in the step S4 until the concentration of Li ions in the mother liquid is 25-35g/L to obtain a lithium-containing concentrated liquid;
s6: and (3) precipitating lithium by using soda ash: and (4) adding a sodium carbonate solution into the lithium-containing concentrated solution obtained in the step (S5), reacting, then centrifugally separating the precipitate, washing and drying the precipitate to obtain the battery-grade lithium carbonate.
According to the preferred embodiment of the present invention, before the step S1, the method further comprises a step S0 of disassembling the battery: the anode powder is separated from the waste lithium ion battery through the working procedures of discharging, disassembling, sorting, crushing, screening and the like.
According to a preferred embodiment of the present invention, the positive electrode powder is at least one of lithium cobaltate, lithium manganate, lithium nickel manganate and lithium nickel cobalt manganate.
According to the preferred embodiment of the present invention, the acidified material is prepared by ball milling in step S1.
According to the preferred embodiment of the present invention, the baking time in step S2 is 1-2 h.
According to the preferred embodiment of the present invention, step S2 is performed by baking in an oxygen-containing atmosphere. Such as by the introduction of air or other oxygen-containing gas.
According to the preferred embodiment of the present invention, in step S3, the water is tap water, or the washing liquid or lithium precipitation mother liquid from step S6, or the steam condensate generated by evaporation in step S5.
According to a preferred embodiment of the present invention, the reaction conditions in step S3 are: stirring and reacting for 30-60min at normal temperature.
According to a preferred embodiment of the present invention, in step S4, the inorganic base is at least one of sodium hydroxide, potassium hydroxide and lithium hydroxide.
According to a preferred embodiment of the present invention, the reaction conditions in step S4 are: stirring at 50-80 deg.C for 30-60 min.
According to the preferred embodiment of the present invention, the concentration of the sodium carbonate solution used in step S6 is 200-220 g/L.
According to a preferred embodiment of the present invention, the reaction conditions in step S6 are: reacting for 0.5-1h at 90-100 ℃. The lithium carbonate is slightly soluble in water, the higher the temperature of the water is, the lower the solubility of the lithium carbonate is, and the lithium carbonate is favorably separated out under the condition of 90-100 ℃.
(III) advantageous effects
The invention has the beneficial effects that:
the invention firstly grinds and mixes the lithium-containing anode powder with concentrated sulfuric acid, then calcines the mixture, and extracts lithium by leaching, thus effectively recovering lithium, wherein lithium enters the leaching solution, and nickel, cobalt and manganese are left in the leaching residue. Compared with the prior art, the method has the advantages that the separation of lithium and nickel, cobalt and manganese is thorough, the recovery rate of lithium is up to more than 93%, the consumption of auxiliary materials is low, the nickel, cobalt and manganese are basically lossless, the content of impurities in the finally obtained battery-grade lithium carbonate (the purity of which is up to more than 99.6%) is low, the process is simple, and the method is suitable for industrial production.
Drawings
FIG. 1 is a process flow diagram of the method for recovering lithium from waste lithium ion batteries according to the invention.
FIG. 2 is an XRD pattern of the anode powder obtained by disassembling the cell in example 1.
FIG. 3 is an XRD pattern of leaching residue obtained after lithium extraction by acid roasting in the examples.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 is a flow chart of a preferred embodiment of the method for recovering lithium from waste lithium ion batteries according to the present invention, and the method comprises the following steps:
s0, disassembling the battery: the anode powder is separated from the waste lithium ion battery through the working procedures of discharging, disassembling, sorting, crushing, screening and the like. The positive electrode powder can be at least one of lithium cobaltate, lithium manganate, lithium nickel manganese oxide and lithium nickel cobalt manganese oxide according to different types of lithium batteries.
S1: preparing an acidizing material: mixing the anode powder obtained from the waste lithium ion battery with concentrated sulfuric acid, and leading lithium and H in the anode powder2SO4The molar ratio of (1: 0.5) - (1: 0.6), and uniformly grinding to obtain the acidified material. Among them, ball milling is preferably performed by a ball mill in the grinding.
S2: and (3) high-temperature roasting: roasting the acidified material obtained in the step S1 at the temperature of 450-550 ℃ to obtain a roasted material. Wherein the roasting time is 1-2h, and the roasting is carried out in an oxygen atmosphere, such as introducing air or other gas containing oxygen into the roasting furnace.
S3: leaching and lithium extraction: and (4) adding water into the roasted material obtained in the step (S2) according to the solid-to-liquid ratio of 1:2-3, stirring for reaction, and carrying out solid-liquid separation to obtain a leaching solution and nickel-cobalt-manganese slag.
Wherein the reaction conditions are as follows: stirring and reacting for 30-60min at normal temperature
Wherein, the water is tap water or deionized water, or the washing liquid or lithium precipitation mother liquid from the step S6, or the condensate generated by evaporation in the step S5.
S4: alkalization and impurity removal: adding inorganic base into the leachate obtained in the step S3, adjusting the pH value of the leachate to 12-13, stirring for reaction, carrying out solid-liquid separation, and retaining a filtrate, wherein the filtrate is lithium-containing purified liquid.
Wherein the reaction conditions are as follows: stirring at 50-80 deg.C for 30-60 min.
Wherein the inorganic base is at least one of sodium hydroxide, potassium hydroxide and lithium hydroxide. The organic alkali is easy to complex with impurity ions, and is difficult to form precipitate for impurity removal.
S5: and (3) evaporation and concentration: and (4) evaporating and concentrating the lithium-containing purified liquid obtained in the step (S4) until the concentration of Li ions in the mother liquid is 25-35g/L, thus obtaining the lithium-containing concentrated liquid.
S6: and (3) precipitating lithium by using soda ash: and (4) adding a sodium carbonate solution into the lithium-containing concentrated solution obtained in the step (S5), reacting, then centrifugally separating the precipitate, washing and drying the precipitate to obtain the battery-grade lithium carbonate.
Wherein the concentration of the sodium carbonate solution is 200-220g/L
Wherein the reaction conditions are as follows: reacting for 0.5-1h at 90-100 ℃. The lithium carbonate is slightly soluble in water, the higher the temperature of the water is, the lower the solubility of the lithium carbonate is, and the lithium carbonate is favorably separated out under the condition of 90-100 ℃.
The following are specific examples utilizing the above-described method.
Example 1
The embodiment provides a method for recovering lithium from waste lithium ion batteries, which comprises the following steps:
s0. disassembling the battery: the waste lithium ion battery is subjected to the working procedures of discharging, disassembling, sorting, crushing, screening and the like to separate the nickel cobalt lithium manganate powder, wherein XRD of the nickel cobalt lithium manganate powder is shown in figure 2. As shown in figure 2 of the drawings, in which,
s1, sulfuric acid acidification: weighing 1000g of the nickel cobalt lithium manganate powder obtained in the step A, analyzing that the Li content is 3.88%, the Ni content is 16.46%, the Co content is 9.56% and the Mn content is 6.62%, adding 280g of 98% concentrated sulfuric acid into the positive electrode powder, wherein the molar ratio of the lithium to the concentrated sulfuric acid is 1:0.5, and fully grinding the mixture until the mixture is uniform to obtain an acidified material.
S2, high-temperature roasting: and C, placing the acidified material obtained in the step B into a muffle furnace, roasting for 1.0h at 450 ℃, and cooling to obtain a roasted material.
S3, leaching and lithium extraction: adding 2000ml of tap water into the roasted material obtained in the step C according to the solid-to-liquid ratio of 1:2, stirring and reacting for 30min at normal temperature, and filtering to obtain 1800ml of leaching solution and 950g of leaching slag, wherein the analyzed slag components comprise 0.22% of Li, 16.31% of Ni, 9.47% of Co and 6.15% of Mn. The Li leaching rate is shown in Table 1, and the XRD data of the leaching residue is shown in FIG. 3.
S4, alkalization and impurity removal: and D, adding 32% of sodium hydroxide solution into the leachate obtained in the step D to adjust the pH value of the solution to 12, stirring the solution for 30min at the temperature of 50 ℃, and filtering the solution to obtain the lithium-containing purified solution.
S5, evaporation and concentration: and E, heating, evaporating and concentrating the lithium-containing purified liquid obtained in the step E to 1.46L, wherein the concentration of Li ions in the concentrated liquid is 25 g/L.
S6, precipitating lithium by using soda ash: and F, adding 1.5L of 200g/L sodium carbonate solution into the concentrated solution obtained in the step F, reacting for 0.5h at the temperature of 90 ℃, and after the reaction is completed, centrifuging, washing and drying to obtain 175g of battery-grade lithium carbonate. The chemical composition of lithium carbonate is shown in table 2. The quality of the lithium carbonate meets the requirements of YS/T582-.
Example 2
S0. disassembling the battery: separating lithium cobaltate powder from the waste lithium ion battery through the processes of discharging, disassembling, sorting, crushing, screening and the like;
s1, sulfuric acid acidification: and B, weighing 500g of the lithium cobaltate powder obtained in the step A, analyzing that the Li content is 6.38% and the Co content is 54.22%, adding 230g of 98% concentrated sulfuric acid into the positive electrode powder, wherein the molar ratio of the lithium to the concentrated sulfuric acid is 1:0.5, and fully grinding the mixture until the mixture is uniform to obtain an acidified material.
S2, high-temperature roasting: and C, placing the acidified material obtained in the step B into a muffle furnace, roasting at 550 ℃ for 2.0h, and cooling to obtain a roasted material.
S3, leaching and lithium extraction: and C, adding 1500ml of tap water into the roasted material obtained in the step C according to the solid-to-liquid ratio of 1:3, stirring and reacting for 60min at normal temperature, and filtering to obtain 1450ml of leaching solution and 482g of leaching slag, wherein the content of Li in the analyzed slag component is 0.17%, and the content of Co is 54.01%. The Li extraction rate is shown in Table 1.
S4, alkalization and impurity removal: and D, adding 20% of potassium hydroxide solution into the leachate obtained in the step D to adjust the pH value of the solution to 13, stirring for 60min at the temperature of 80 ℃, and filtering to obtain the lithium-containing purified solution.
S5, evaporation and concentration: and E, heating, evaporating and concentrating the lithium-containing purified liquid obtained in the step E to 880ml, wherein the concentration of Li ions in the concentrated liquid is 35 g/L.
S6, precipitating lithium by using soda ash: and F, adding 1.3L of 220g/L sodium carbonate solution into the concentrated solution obtained in the step F, reacting for 1.0h at the temperature of 100 ℃, and after the reaction is completed, centrifuging, washing and drying to obtain 155g of battery-grade lithium carbonate. The chemical composition of lithium carbonate is shown in table 2. The quality of the lithium carbonate meets the requirements of YS/T582-.
Example 3
S0. disassembling the battery: separating lithium manganate powder from the waste lithium ion battery through the processes of discharging, disassembling, sorting, crushing, screening and the like;
s1, sulfuric acid acidification: weighing 1000g of the lithium manganate powder obtained in the step A, analyzing that the Li content is 3.64% and the Mn content is 57.71%, adding 315g of 98% concentrated sulfuric acid into the positive electrode powder, wherein the molar ratio of the lithium to the concentrated sulfuric acid is 1:0.6, and fully grinding the mixture until the mixture is uniform to obtain an acidified material.
S2, high-temperature roasting: and C, placing the acidified material obtained in the step B into a muffle furnace, roasting for 1.5h at 500 ℃, and cooling to obtain a roasted material.
S3, leaching and lithium extraction: and C, adding 2500ml of tap water into the roasted material obtained in the step C according to the solid-to-liquid ratio of 1:2.5, stirring and reacting for 50min at normal temperature, and filtering to obtain 2400ml of leaching solution and 940g of leaching residue, wherein the content of Li in the analyzed residue is 0.26%, and the content of Mn is 55.8%. The Li extraction rate is shown in Table 1.
S4, alkalization and impurity removal: and D, adding 20% of lithium hydroxide solution into the leachate obtained in the step D to adjust the pH value of the solution to 13, stirring for 50min at the temperature of 60 ℃, and filtering to obtain the lithium-containing purified solution.
S5, evaporation and concentration: and E, heating, evaporating and concentrating the lithium-containing purified liquid obtained in the step E to 1150ml, wherein the concentration of Li ions in the concentrated liquid is 30 g/L.
S6, precipitating lithium by using soda ash: and F, adding 1.44L of 210g/L sodium carbonate solution into the concentrated solution obtained in the step F, reacting for 40min at 95 ℃, and after the reaction is completed, centrifuging, washing and drying to obtain 173g of battery-grade lithium carbonate. The chemical composition of lithium carbonate is shown in table 2. The quality of the lithium carbonate meets the requirements of YS/T582-.
Example 4
S0. disassembling the battery: separating lithium nickel manganese oxide powder from the waste lithium ion battery through the processes of discharging, disassembling, sorting, crushing, screening and the like;
s1, sulfuric acid acidification: weighing 1000g of the lithium nickel manganese oxide powder obtained in the step A, analyzing that the lithium content is 3.58%, the nickel content is 13.70% and the Mn content is 38.36%, adding 284g of 98% concentrated sulfuric acid into the positive electrode powder, wherein the molar ratio of lithium to concentrated sulfuric acid is 1:0.55, and fully and uniformly ball-milling to obtain an acidified material.
S2, high-temperature roasting: and C, placing the acidified material obtained in the step B into a muffle furnace, roasting for 1.5h at 500 ℃, and cooling to obtain a roasted material.
S3, leaching and lithium extraction: and C, adding 3000ml of tap water into the roasted material obtained in the step C according to the solid-to-liquid ratio of 1:3, stirring and reacting for 60min at normal temperature, and filtering to obtain 2850ml of leaching solution and 945g of leaching slag, wherein the analyzed slag components comprise 0.23% of Li, 13.4% of Ni and 37.2% of Mn. The Li extraction rate is shown in Table 1.
S4, alkalization and impurity removal: and D, adding 32% sodium hydroxide solution into the leachate obtained in the step D to adjust the pH of the solution to 13, stirring for 30min at the temperature of 50 ℃, and filtering to obtain the lithium-containing purified solution.
S5, evaporation and concentration: and E, heating, evaporating and concentrating the lithium-containing purified liquid obtained in the step E to 1050ml, wherein the concentration of Li ions in the concentrated liquid is 32 g/L.
S6, precipitating lithium by using soda ash: and F, adding 1.50L of 200g/L sodium carbonate solution into the concentrated solution obtained in the step F, reacting for 30min at 95 ℃, and centrifuging, washing and drying after the reaction is completed to obtain 165g of battery-grade lithium carbonate. The chemical composition of lithium carbonate is shown in table 2. The quality of the lithium carbonate meets the requirements of YS/T582-.
Watch (A)
Leaching data of acidified roasted material of each anode powder
Watch (A)
Technical index of battery grade lithium carbonate product
The above description is only illustrative of several specific embodiments of the present invention, but not limiting the scope of the present invention, and any person skilled in the art should be considered as falling within the scope of the present invention by making equivalent changes or simple modifications according to the technical solution and concept of the present invention.
Claims (10)
1. A method for recovering lithium from waste lithium ion batteries is characterized by comprising the following steps:
s1: preparing an acidizing material: mixing the anode powder obtained from the waste lithium ion battery with concentrated sulfuric acid, and leading lithium and H in the anode powder2SO4The molar ratio of (1: 0.5) - (1: 0.6), and uniformly grinding to obtain an acidified material;
s2: and (3) high-temperature roasting: roasting the acidified material obtained in the step S1 at the temperature of 450-550 ℃ to obtain a roasted material;
s3: leaching and lithium extraction: adding water into the roasting material obtained in the step S2 according to the solid-to-liquid ratio of 1:2-3, stirring for reaction, and carrying out solid-liquid separation to obtain a leaching solution and nickel-cobalt-manganese slag;
s4: alkalization and impurity removal: adding inorganic base into the leachate obtained in the step S3, adjusting the pH value of the leachate to 12-13, stirring for reaction, carrying out solid-liquid separation, and retaining a filtrate, wherein the filtrate is lithium-containing purified liquid;
s5: and (3) evaporation and concentration: evaporating and concentrating the lithium-containing purified liquid obtained in the step S4 until the concentration of Li ions in the mother liquid is 25-35g/L to obtain a lithium-containing concentrated liquid;
s6: and (3) precipitating lithium by using soda ash: and (4) adding a sodium carbonate solution into the lithium-containing concentrated solution obtained in the step (S5), reacting, then centrifugally separating the precipitate, washing and drying the precipitate to obtain the battery-grade lithium carbonate.
2. The method of claim 1, further comprising, before the step S1, a step S0 of battery disassembly: the anode powder is separated from the waste lithium ion battery through the working procedures of discharging, disassembling, sorting, crushing, screening and the like.
3. The method according to claim 1, characterized in that the positive electrode powder is at least one of lithium cobaltate, lithium manganate, lithium nickel manganate, and lithium nickel cobalt manganate.
4. The method of claim 1, wherein the acidified material is prepared by ball milling in step S1.
5. The method of claim 1, wherein step S2 is firing in an oxygen-containing atmosphere.
6. The method of claim 1, wherein in step S3, the water is tap water, or the washing liquid or lithium precipitation mother liquid from step S6, or the vapor condensate generated from evaporation in step S5.
7. The method according to claim 1, wherein the reaction conditions in step S3 are: stirring and reacting for 30-60min at normal temperature.
8. The method according to claim 1, wherein in step S4, the inorganic base is at least one of sodium hydroxide, potassium hydroxide, and lithium hydroxide.
9. The method according to claim 1, wherein the reaction conditions in step S4 are: stirring at 50-80 deg.C for 30-60 min.
10. The method according to claim 1, wherein the concentration of the sodium carbonate solution used in step S6 is 200-220g/L, and the reaction conditions are: reacting for 0.5-1h at 90-100 ℃.
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| CN111924892A (en) * | 2020-07-24 | 2020-11-13 | 中国科学院过程工程研究所 | Method for selectively recovering lithium ion battery electrode powder |
| CN111987381A (en) * | 2020-08-25 | 2020-11-24 | 长沙矿冶研究院有限责任公司 | Method for synchronously defluorinating valuable metals leached from waste lithium ion batteries |
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| CN114890443A (en) * | 2022-04-13 | 2022-08-12 | 江西九岭锂业股份有限公司 | System and process method for high-value utilization of lithium-containing waste |
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| CN114606398A (en) * | 2022-03-22 | 2022-06-10 | 昆明理工大学 | Method for recovering lithium from leaching waste liquid of waste lithium ion battery anode material |
| CN114606398B (en) * | 2022-03-22 | 2023-09-08 | 昆明理工大学 | Method for recycling lithium from waste lithium ion battery anode material leaching waste liquid |
| CN114890443A (en) * | 2022-04-13 | 2022-08-12 | 江西九岭锂业股份有限公司 | System and process method for high-value utilization of lithium-containing waste |
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| EP4353853A1 (en) * | 2022-10-12 | 2024-04-17 | Ascend Elements, Inc. | Nickel rich battery recycling |
| CN115818675A (en) * | 2022-12-07 | 2023-03-21 | 湖南国重智能科技有限公司 | Method for comprehensively utilizing waste electrolyte containing lithium and aluminum |
| CN115818675B (en) * | 2022-12-07 | 2024-01-23 | 湖南国重智能科技有限公司 | Comprehensive utilization method of lithium-aluminum-containing waste electrolyte |
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