CN110474123A - Positive material of waste lithium iron phosphate comprehensive recovering process - Google Patents
Positive material of waste lithium iron phosphate comprehensive recovering process Download PDFInfo
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- CN110474123A CN110474123A CN201910786032.1A CN201910786032A CN110474123A CN 110474123 A CN110474123 A CN 110474123A CN 201910786032 A CN201910786032 A CN 201910786032A CN 110474123 A CN110474123 A CN 110474123A
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- iron phosphate
- positive material
- waste lithium
- lithium iron
- filtrate
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/30—Alkali metal phosphates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/37—Phosphates of heavy metals
- C01B25/375—Phosphates of heavy metals of iron
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D15/00—Lithium compounds
- C01D15/08—Carbonates; Bicarbonates
-
- 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
-
- 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
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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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 belongs to waste lithium cell technical field of resource recovery, more particularly to a kind of positive material of waste lithium iron phosphate comprehensive recovering process, the following steps are included: the positive material of waste lithium iron phosphate after pulverizing and sieving is put into ferric salt solution by (1), it is filtered after reaction, obtains the first filtrate and the first filter cake；(2) alkali and oxidant are added in first filtrate, is filtered after reaction, obtains the second filtrate and the second filter cake；(3) lithium salts precipitating reagent is added in second filtrate, is filtered after reaction, obtains third filtrate and crude lithium salts, return step (1) recycles after third filtrate fills into ferric ion.Method of the invention, as leaching reagent, is had the advantages that pollution-free, high (> 96%) to the leaching efficiency of lithium using trivalent iron salt.
Description
Technical field
The invention belongs to waste lithium cell technical field of resource recovery, and in particular to a kind of waste lithium iron phosphate battery anode
Material comprehensive recovering process.
Background technique
With the high speed development of new-energy automobile industry, the demand to the year two thousand twenty dynamic lithium battery is up to 125GWh,
Learies will reach 32.2GWh, about 500,000 tons；By 2023, learies were up to 101GWh, and about 1,160,000 tons.By LiFePO4 electricity
What the installation amount in pond accounted for about whole lithium battery total amount 1/3 calculates, and the coming years, China will generate about 20~400,000 tons of waste phosphoric acid
Lithium iron battery.If the ferric phosphate lithium cell scrapped mustn't go to appropriate disposition, it will cause huge pollution to environment.It is discarded
Ferric phosphate lithium cell has significant resource, wherein the potential value highest of lithium.Therefore, the recycling of waste lithium iron phosphate battery
It is very urgent.
Currently, there are mainly two types of the recovery methods of waste lithium iron phosphate positive electrode: Direct Regeneration and hydrometallurgical recovery
Valuable metal.The method of Direct Regeneration is although simple, environmental-friendly, but regenerated positive electrode contains other impurities due to it
Element makes regenerated performance of lithium ion battery bad.Hydrometallurgical processing method is generally used Acid leaching, Chinese patent
It is related to about most of in the recovery method of positive material of waste lithium iron phosphate, such as Publication No.
The patent application of CN109207730A, CN109775678A, CN106684485A, CN107739830A etc..Although this method
Leaching rate is higher but the later period, a large amount of lye was needed to go to neutralize excessive acid solution early period and used acid cannot recycle makes
With so causing process route complexity and increasing production cost.
Summary of the invention
It is comprehensive the purpose of the present invention is in view of the drawbacks of the prior art, providing a kind of positive material of waste lithium iron phosphate
Close recovery method.
Specifically, a kind of positive material of waste lithium iron phosphate comprehensive recovering process of the invention, comprising the following steps:
(1) positive material of waste lithium iron phosphate after pulverizing and sieving is put into ferric salt solution, mistake after reaction
Filter, obtains the first filtrate and the first filter cake；
(2) alkali and oxidant are added in first filtrate, is filtered after reaction, obtains the second filtrate and the second filter cake；
(3) lithium salts precipitating reagent is added in second filtrate, is filtered after reaction, obtains third filtrate and crude lithium salts,
Return step (1) recycles after third filtrate fills into ferric ion.
Above-mentioned positive material of waste lithium iron phosphate comprehensive recovering process further include: dry first Washing of Filter Cake
Ferric phosphate is obtained after dry.
Above-mentioned positive material of waste lithium iron phosphate comprehensive recovering process further include: acid is added in second filter cake
Middle generation ferric salt solution recycles the ferric salt solution return step (1).
Above-mentioned positive material of waste lithium iron phosphate comprehensive recovering process, in step (1), the reaction temperature of the reaction
Degree is 25-70 DEG C, reaction time 23-60min, and the iron and the waste lithium iron phosphate battery in the ferric salt solution are just
The molar ratio of LiFePO4 in the material of pole is 1:1.
Above-mentioned positive material of waste lithium iron phosphate comprehensive recovering process, the waste lithium iron phosphate battery anode material
The ratio of material and the ferric salt solution is (40g-500g): 1L.
Above-mentioned positive material of waste lithium iron phosphate comprehensive recovering process, in step (1), the ferric salt solution
Including one of ferrum sulfuricum oxydatum solutum, ferric chloride solution and nitric acid iron salt solutions or a variety of.
Above-mentioned positive material of waste lithium iron phosphate comprehensive recovering process, in step (2), the alkali includes hydroxide
One of sodium, potassium hydroxide, lithium hydroxide and ammonium hydroxide.
Above-mentioned positive material of waste lithium iron phosphate comprehensive recovering process, in step (2), the oxidant included
One of hydrogen oxide, oxygen, air, ozone.
Above-mentioned positive material of waste lithium iron phosphate comprehensive recovering process, the lithium salts precipitating reagent include sodium carbonate or
Sodium phosphate.
Above-mentioned positive material of waste lithium iron phosphate comprehensive recovering process, the acid is including in sulfuric acid, nitric acid, hydrochloric acid
It is one or more.
Technical solution of the present invention have it is following the utility model has the advantages that
(1) method of the invention can be recovered to lithium salts and high-purity phosphoric acid from positive material of waste lithium iron phosphate
Iron realizes the synthetical recovery of positive material of waste lithium iron phosphate；
(2) present invention utilizes LiFePO4 and the similar olivine structural of ferric phosphate, in the case where no introducing is sour, only
Lithium in LiFePO4 can quickly and efficiently be leached as leaching reagent using trivalent iron salt, there is leaching pollution-free, to lithium
The advantages of high-efficient out (> 96%)；Moreover, trivalent iron salt is cheap, from a wealth of sources, waste lithium iron phosphate battery is being reduced just
The cost recovery of pole material；
(3) present invention is closed circuit circulatory system, and leaching reagent and mother liquor can be achieved to be recycled, whole to arrange without waste liquid
Out, it further reduced production cost and reduce the secondary pollution to environment.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.
Fig. 1 is that the process of the positive material of waste lithium iron phosphate comprehensive recovering process of one embodiment of the present invention is shown
It is intended to；
Fig. 2 is the stream of the positive material of waste lithium iron phosphate comprehensive recovering process of a preferred embodiment of the invention
Cheng Tu.
Specific embodiment
In order to fully understand the purpose of the present invention, feature and effect, by following specific embodiments, the present invention is made detailed
It describes in detail bright.For process of the invention in addition to following the description, remaining is all made of the conventional method or device of this field.Following nouns
Term is unless otherwise stated, all have the normally understood meaning of those skilled in the art.
In one embodiment, as shown in Figure 1, the present invention provides a kind of positive material of waste lithium iron phosphate is comprehensive
Close recovery method, comprising the following steps:
(1) positive material of waste lithium iron phosphate after pulverizing and sieving is put into ferric salt solution, mistake after reaction
Filter, obtains the first filtrate and the first filter cake.
Wherein, the positive material of waste lithium iron phosphate is the positive electrode that waste lithium iron phosphate battery is disassembled
And/or the discarded positive electrode generated in ferric phosphate lithium cell manufacturing process.
Preferably, the partial size D of the positive material of waste lithium iron phosphate10–D90For 0.6-36.6.
The ionic equation that the positive material of waste lithium iron phosphate reacts in ferric salt solution is as follows:
Wherein, first filter cake is ferric phosphate, obtains ferric phosphate after washed screening；First filtrate is to contain lithium
The solution of ion, ferrous ion.
Preferably, the reaction temperature of the reaction is 25-70 DEG C, reaction time 23-60min, and the trivalent iron salt is molten
The mole ratio of iron in liquid and the iron in the positive material of waste lithium iron phosphate is 1:1.
It is furthermore preferred that the reaction temperature of the reaction is 28 DEG C, reaction time 30min.
It is further preferred that the ratio of the positive material of waste lithium iron phosphate and the ferric salt solution is
(40g-500g):1L。
Optionally, the ferric salt solution includes one in ferrum sulfuricum oxydatum solutum, ferric chloride solution and nitric acid iron salt solutions
Kind is a variety of.
In the present invention, the positive material of waste lithium iron phosphate is handled by step (1), isolated phosphoric acid
Iron, wherein the ferric phosphate recycled can be used for manufacturing ferric phosphate lithium cell, also can be used as catalyst or as preparation ceramics
Material etc..
The leaching reagent that the present invention uses is trivalent iron salt, is had cheap, from a wealth of sources, pollution-free and to lithium
The advantage of leaching efficiency height (> 96%).
(2) alkali and oxidant are added in first filtrate, is filtered after reaction, obtains the second filtrate and the second filter cake.
Ferrous ion and alkali and oxidant reaction when first filtrate and alkali and oxidant contact, in the first filtrate
Generate ferric hydroxide precipitate.In the following, the ionic equation that this step reacts is as follows so that oxidant is oxygen as an example:
4Fe2++8OH-+2H2O+O2=4Fe (OH)3↓
Wherein, the lithium ion of reaction is predominantly had neither part nor lot in second filtrate, second filter cake is the hydrogen-oxygen generated
Change iron precipitating.
Optionally, the alkali includes one of sodium hydroxide, potassium hydroxide, lithium hydroxide and ammonium hydroxide.
Optionally, the oxidant includes one of hydrogen peroxide, oxygen, air, ozone.
Preferably, the concentration of the alkali is 2-5mol/L.
In the present invention, the positive material of waste lithium iron phosphate passes through the processing of step (2), isolated hydrogen-oxygen
Change iron, wherein iron hydroxide can be used to pigment processed, drug, be used as water purification agent, it is also possible to do the antidote etc. of arsenic.
(3) lithium salts precipitating reagent is added in second filtrate, is filtered after reaction, obtains third filtrate and crude lithium salts,
Return step (1) recycles after third filtrate fills into ferric ion.
Wherein, the lithium salts precipitating reagent is sodium carbonate or sodium phosphate, the corresponding crude lithium salts generated be respectively lithium carbonate and
Lithium phosphate.
Specifically, when lithium salts precipitating reagent is sodium carbonate, the ionic equation that reacts are as follows:
2Li++CO3 2-→Li2CO3↓
When lithium salts precipitating reagent is sodium phosphate, the ionic equation that reacts are as follows:
3Li++PO4 3-→Li3PO4↓
In the present invention, the positive material of waste lithium iron phosphate passes through the processing of step (3), can obtain carbonic acid
Lithium or lithium phosphate.Wherein, the lithium ion battery raw material that lithium carbonate and lithium phosphate can be used as, is also used as catalyst or system
Standby ceramics, raw material of glass etc..
The present invention is avoided and is polluted the environment, realize useless by recycling third filtrate return step (1)
The circulation of object repeatedly utilizes.
As shown in Figure 1, positive material of waste lithium iron phosphate comprehensive recovering process of the invention is from waste lithium iron phosphate
Ferric phosphate, hydroxide have been recovered in the discarded positive electrode generated in cell positive material or ferric phosphate lithium cell manufacturing process
Iron and lithium salts realize the synthetical recovery of positive material of waste lithium iron phosphate, avoid the ferric phosphate lithium cell pair scrapped
It is polluted caused by environment.
In yet another embodiment, as shown in Fig. 2, the present invention provides a kind of positive material of waste lithium iron phosphate
Comprehensive recovering process, comprising the following steps: (1) positive material of waste lithium iron phosphate after pulverizing and sieving is put into ferric iron
It in salting liquid, is filtered after reaction, obtains the first filtrate and the first filter cake；(2) alkali and oxidant are added in first filtrate,
It is filtered after reaction, obtains the second filtrate and the second filter cake；(3) second filter cake is added in acid and generates ferric salt solution,
The ferric salt solution return step (1) is recycled；(4) lithium salts precipitating reagent, reaction are added in second filtrate
After filter, obtain third filtrate and crude lithium salts, return step (1) recycles after third filtrate fills into ferric ion.
In this embodiment, the present invention is with acid solution by being dissolved the second filter cake (ingredient of filter cake be iron hydroxide), and
The ferric salt solution of generation is returned into salt leaching step, realizes recycling for iron.
Wherein, the acid in step (3) includes one of sulfuric acid, nitric acid, hydrochloric acid or a variety of.
In this embodiment, it leaches reagent and mother liquor is recycled, not discharging any waste liquor, reduce production cost simultaneously
Reduce the secondary pollution to environment.
In this embodiment, other than being recycled after the second filter cake acid is molten, the technical solution of other steps and have
Beneficial effect is identical as in embodiment shown in fig. 1, and this will not be detailed here by the present invention.
As shown in Fig. 2, positive material of waste lithium iron phosphate comprehensive recovering process of the invention is from waste lithium iron phosphate
Recycling has obtained ferric phosphate and lithium in the discarded positive electrode generated in cell positive material or ferric phosphate lithium cell manufacturing process
Salt realizes the synthetical recovery of positive material of waste lithium iron phosphate, wherein leaching reagent and mother liquor have carried out circulation and made
With, it is whole to be discharged without waste liquid, it reduces production cost and reduces the secondary pollution to environment.
Embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.In the following examples, the experimental methods for specific conditions are not specified, according to conventional methods and conditions.Following implementation
Raw material used in example is that regular market purchase obtains.
Embodiment 1
It (1) is that 1.875mol/L ferric sulfate is added after 93.27% LiFePO4 waste material pulverizes and sieves by 100g mass fraction
Solution is stirred to react, wherein 500g LiFePO4 waste material is added in every liter of ferrum sulfuricum oxydatum solutum, reaction temperature is 25 DEG C, when reaction
Between be 23min, obtain the solution containing metal ions such as lithium, iron；
(2) step (1) acquired solution is filtered, obtains phosphoric acid scum and containing lithium, ferrous solution；
(3) crude ferric phosphate is obtained after phosphoric acid scum obtained by step (2) being washed with water；
(4) will be obtained by step (2) containing 5mol/L sodium hydroxide solution is added in lithium, ferrous solution, and it is passed through oxygen, after reaction
Hydroxide scum and lithium-containing solution is obtained by filtration；
(5) it will be added in 2mol/L sulfuric acid solution in hydroxide scum obtained by step (4), obtained iron salt solutions can follow
Ring uses；
(6) saturated sodium carbonate solution will be added in lithium-containing solution obtained by step (4), it is 94.89% that content, which is obtained by filtration,
Crude lithium carbonate.It is computed, the leaching rate of elemental lithium is 96.67%.
Embodiment 2
It (1) is that 1.5mol/L ferric sulfate solution is added after 93.27% LiFePO4 waste material pulverizes and sieves by 100g mass fraction
Liquid is stirred to react, wherein 400g LiFePO4 waste material is added in every liter of ferrum sulfuricum oxydatum solutum, reaction temperature is 70 DEG C, the reaction time
For 40min, the solution containing metal ions such as lithium, iron is obtained；
(2) step (1) acquired solution is filtered, obtains phosphoric acid scum and containing lithium, ferrous solution；
(3) crude ferric phosphate is obtained after phosphoric acid scum obtained by step (2) being washed with water；
(4) will be obtained by step (2) containing 4mol/L potassium hydroxide solution is added in lithium, ferrous solution, and it is passed through oxygen, after reaction
Hydroxide scum and lithium-containing solution is obtained by filtration；
(5) it will be added in 1.5mol/L sulfuric acid solution in hydroxide scum obtained by step (4), obtained iron salt solutions can be with
It is recycled；
(6) saturated sodium carbonate solution will be added in lithium-containing solution obtained by step (4), be obtained by filtration content be 95.3 it is crude
Lithium carbonate.It is computed, the leaching efficiency 98.82% of elemental lithium.
Embodiment 3
It (1) is that 0.12mol/L ferric sulfate solution is added after 93.27% LiFePO4 waste material pulverizes and sieves by 100g mass fraction
Liquid is stirred to react, wherein 40g LiFePO4 waste material is added in every liter of ferrum sulfuricum oxydatum solutum, reaction temperature is 25 DEG C, and the reaction time is
30min obtains the solution containing metal ions such as lithium, iron；
(2) step (1) acquired solution is filtered, obtains phosphoric acid scum and containing lithium, ferrous solution；
(3) crude ferric phosphate is obtained after phosphoric acid scum obtained by step (2) being washed with water；
(4) will be obtained by step (2) containing 2mol/L sodium hydroxide solution is added in lithium, ferrous solution, and it is passed through oxygen, after reaction
Hydroxide scum and lithium-containing solution is obtained by filtration；
(5) it will be added in 1mol/L sulfuric acid solution in hydroxide scum obtained by step (4), obtained iron salt solutions can follow
Ring uses；
(6) saturated sodium carbonate solution will be added in lithium-containing solution obtained by step (4), it is 95.56% that content, which is obtained by filtration,
Crude lithium carbonate.It is computed, the leaching efficiency 99.03% of elemental lithium.
Embodiment 4
It (1) is that 1.125mol/L ferric sulfate is added after 93.27% LiFePO4 waste material pulverizes and sieves by 100g mass fraction
Solution is stirred to react, wherein 300g LiFePO4 waste material is added in every liter of ferrum sulfuricum oxydatum solutum, reaction temperature is 70 DEG C, when reaction
Between be 60min, obtain the solution containing metal ions such as lithium, iron；
(2) step (1) acquired solution is filtered, obtains phosphoric acid scum and containing lithium, ferrous solution；
(3) crude ferric phosphate is obtained after phosphoric acid scum obtained by step (2) being washed with water；
(4) will be obtained by step (2) containing 3mol/L sodium hydroxide solution is added in lithium, ferrous solution, and it is passed through oxygen, after reaction
Hydroxide scum and lithium-containing solution is obtained by filtration；
(6) saturated sodium carbonate solution will be added in lithium-containing solution obtained by step (4), the thick of content 95.34% is obtained by filtration
Lithium carbonate processed.It is computed, the leaching rate of elemental lithium is 98.67%.
The present invention is hereinbefore disclosed with preferred embodiment, but it should be understood by those skilled in the art that, these
Embodiment is only used for describing the present invention, but should not be understood as limiting the scope of the invention.It should be noted that all implement with these
Example equivalent variation and displacement, should all be set as being covered by scope of the presently claimed invention.Therefore, protection scope of the present invention
It should be subject to range defined in claims.
Claims (10)
1. a kind of positive material of waste lithium iron phosphate comprehensive recovering process, which comprises the following steps:
(1) positive material of waste lithium iron phosphate after pulverizing and sieving is put into ferric salt solution, is filtered after reaction, obtained
To the first filtrate and the first filter cake；
(2) alkali and oxidant are added in first filtrate, is filtered after reaction, obtains the second filtrate and the second filter cake；
(3) lithium salts precipitating reagent is added in second filtrate, is filtered after reaction, obtains third filtrate and crude lithium salts, third
Return step (1) recycles after filtrate fills into ferric ion.
2. positive material of waste lithium iron phosphate comprehensive recovering process according to claim 1, which is characterized in that also wrap
It includes: ferric phosphate will be obtained after first Washing of Filter Cake drying.
3. positive material of waste lithium iron phosphate comprehensive recovering process according to claim 1, which is characterized in that also wrap
It includes: second filter cake being added in acid and generates ferric salt solution, the ferric salt solution return step (1) is recycled into benefit
With.
4. positive material of waste lithium iron phosphate comprehensive recovering process according to claim 1, which is characterized in that step
(1) in, the reaction temperature of the reaction is 25-70 DEG C, reaction time 23-60min, the iron in the ferric salt solution with
The molar ratio of iron in the positive material of waste lithium iron phosphate is 1:1.
5. positive material of waste lithium iron phosphate comprehensive recovering process according to claim 4, which is characterized in that described
The ratio of positive material of waste lithium iron phosphate and the ferric salt solution is (40g-500g): 1L.
6. positive material of waste lithium iron phosphate comprehensive recovering process according to claim 1, which is characterized in that step
(1) in, the ferric salt solution includes one of ferrum sulfuricum oxydatum solutum, ferric chloride solution and nitric acid iron salt solutions or a variety of.
7. positive material of waste lithium iron phosphate comprehensive recovering process according to claim 1, which is characterized in that step
(2) in, the alkali includes one of sodium hydroxide, potassium hydroxide, lithium hydroxide and ammonium hydroxide.
8. positive material of waste lithium iron phosphate comprehensive recovering process according to claim 1, which is characterized in that step
(2) in, the oxidant includes one of hydrogen peroxide, oxygen, air, ozone.
9. positive material of waste lithium iron phosphate comprehensive recovering process according to claim 1, which is characterized in that described
Lithium salts precipitating reagent includes sodium carbonate or sodium phosphate.
10. positive material of waste lithium iron phosphate comprehensive recovering process according to claim 3, which is characterized in that institute
Stating acid includes one of sulfuric acid, nitric acid, hydrochloric acid or a variety of.
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Cited By (9)
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| CN111206153A (en) * | 2020-02-20 | 2020-05-29 | 贵州红星电子材料有限公司 | Method for recovering positive electrode material of nickel-cobalt-manganese acid lithium battery |
| CN112374550A (en) * | 2020-11-09 | 2021-02-19 | 贵州红星电子材料有限公司 | Comprehensive recovery method for waste lithium iron phosphate and nickel cobalt lithium manganate lithium battery anode material |
| CN112678791A (en) * | 2020-12-25 | 2021-04-20 | 湖南邦普循环科技有限公司 | Method for recovering lithium in lithium iron phosphate waste and application thereof |
| CN113072048A (en) * | 2021-04-09 | 2021-07-06 | 湖北虹润高科新材料有限公司 | Sewage treatment and slag recycling process for producing iron phosphate by sodium method |
| CN113104866A (en) * | 2021-03-30 | 2021-07-13 | 中国石油大学(北京) | Method for preparing battery-grade lithium carbonate from lithium iron phosphate waste |
| CN113562717A (en) * | 2021-07-28 | 2021-10-29 | 中南大学 | Method for recycling and regenerating waste lithium iron phosphate batteries at low temperature |
| CN114497796A (en) * | 2022-02-15 | 2022-05-13 | 湖南工程学院 | Full-component resource recycling method for lithium iron phosphate-carbon waste |
| CN114583307A (en) * | 2022-03-03 | 2022-06-03 | 九江天赐高新材料有限公司 | Method and device for recycling black powder of waste lithium ion battery |
| CN116143146A (en) * | 2021-11-19 | 2023-05-23 | 核工业北京化工冶金研究院 | Leaching method of waste lithium iron phosphate anode powder |
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