CN113604670A - Method for recovering lithium cobaltate positive plate - Google Patents
Method for recovering lithium cobaltate positive plate Download PDFInfo
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- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
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- C22B26/12—Obtaining lithium
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- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
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- 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
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Abstract
The application provides a lithium cobaltate positive plate recovery method, this method is in organic solvent soaking process, use first temperature respectively, the second temperature soaks, first temperature is less than the second temperature, it can guarantee that all lithium cobaltate powder fully contacts with organic solvent to soak earlier the low temperature, the wettability is good, then soak at high temperature and assist in stirring and dissolve the binder, soak earlier the high temperature and soak the stirring again at low temperature, because of the effect of centrifugal force when can preventing all the time high temperature stirring, the pole piece stirs into a whole, the inside and organic solvent contact failure of pole piece, only outside part lithium cobaltate contacts with organic solvent and plays the effect of dissolving the binder, cause lithium cobaltate powder and aluminium foil separation incomplete.
Description
Technical Field
The application relates to the technical field of hydrometallurgy recovery, in particular to a method for recovering a lithium cobaltate positive plate.
Background
The cobaltous acid lithium battery is mainly used for medium and small-sized batteries and is widely applied to electronic products such as notebook computers, mobile phones and the like due to stable battery structure, high specific capacity and outstanding comprehensive performance. The content of cobalt and lithium in the positive plate of the lithium cobaltate battery is higher, and the cobalt and the lithium are rare strategic metals, so that the recovery value and the significance of the cobalt and the lithium are more and more important. However, the lithium cobaltate positive plate is very compact due to the manufacturing process, so that the conventional battery crushing and sorting method is difficult to cause the lithium cobaltate powder to fall off from the positive aluminum plate, and huge loss is caused.
Some battery recycling plants carry out high-temperature roasting on the lithium cobaltate positive plate, then crushing and sorting the lithium cobaltate positive plate again, and then carry out wet leaching by adding hydrogen peroxide into sulfuric acid. Although some battery recycling plants make lithium cobaltate powder fall off from the anode aluminum sheet by an organic solvent dissolving method, part of the binder enters the leaching section due to poor dissolving process, and a large amount of sulfuric acid and hydrogen peroxide are consumed in the wet leaching section, so that the leaching efficiency is low and the cost is high.
Disclosure of Invention
The application aims to provide a method for recovering a lithium cobaltate positive plate, and aims to solve the problems of high pollution, high cost and low efficiency in the prior art.
In order to achieve the above object, the present application provides a method for recovering a lithium cobaltate positive electrode sheet, comprising:
soaking in an organic solvent: soaking the lithium cobaltate positive plate in an organic solvent at a first temperature and a second temperature in sequence, and stirring in the second temperature soaking process to obtain a soaking mixture;
primary filtration: filtering the soaked mixture to respectively obtain an anode aluminum sheet and a first filtrate;
secondary filtration: filtering the first filtrate to respectively obtain a second filtrate and positive lithium cobaltate powder;
reduction leaching: and leaching the positive lithium cobaltate powder in a sulfuric acid and hydrogen peroxide system to obtain cobalt and lithium.
Preferably, the first temperature is 30-50 ℃ and the second temperature is 60-95 ℃.
Preferably, the size of the pores of the screen for the first filtration is 10-15 mm, and the size of the pores of the screen for the second filtration is 2-5 mm.
Preferably, 5-10 ml of organic solvent is used for soaking each gram of lithium cobaltate positive electrode sheet.
Preferably, the first temperature soaking time is 0.5-1 h, and the second temperature soaking time is 1-2 h.
Preferably, the infusion mixture is dispersed using an ultrasonic shaker.
Preferably, the stirring speed is 600-800 r/min.
Preferably, the molar ratio of the sulfuric acid to the hydrogen peroxide in the sulfuric acid + hydrogen peroxide system is 1: (0.4-0.6), leaching the lithium cobaltate powder in a sulfuric acid and hydrogen peroxide system of 3-5 ml per gram of the positive electrode.
Preferably, the reduction leaching temperature is 60-90 ℃, and the leaching time is 1-2 h.
Preferably, the organic solvent before soaking further comprises:
crushing: and crushing the lithium cobaltate positive plate into fragments of 20-35 mm.
Compared with the prior art, the beneficial effect of this application includes:
the application provides a lithium cobaltate positive plate recovery method, this method is in organic solvent soaking process, use first temperature respectively, the second temperature soaks, first temperature is less than the second temperature, it can guarantee that all lithium cobaltate powder fully contacts with organic solvent to soak earlier the low temperature, the wettability is good, then soak at high temperature and assist in stirring and dissolve the binder, soak earlier the high temperature and soak the stirring again at low temperature, because of the effect of centrifugal force when can preventing all the time high temperature stirring, the pole piece stirs into a whole, the inside and organic solvent contact failure of pole piece, only outside part lithium cobaltate contacts with organic solvent and plays the effect of dissolving the binder, cause lithium cobaltate powder and aluminium foil separation incomplete.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments are briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope of the present application.
Fig. 1 is a schematic flow chart of the method for recovering a lithium cobaltate positive electrode sheet according to the present invention.
Detailed Description
The terms as used herein:
"prepared from … …" is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
The conjunction "consisting of … …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of … …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when the range "1 ~ 5" is disclosed, the ranges described should be construed to include the ranges "1 ~ 4", "1 ~ 3", "1 ~ 2 and 4 ~ 5", "1 ~ 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In these examples, the parts and percentages are by mass unless otherwise indicated.
"part by mass" means a basic unit of measure indicating a mass ratio of a plurality of components, and 1 part may represent any unit mass, for example, 1g or 2.689 g. If we say that the part by mass of the component A is a part by mass and the part by mass of the component B is B part by mass, the ratio of the part by mass of the component A to the part by mass of the component B is a: b. alternatively, the mass of the A component is aK and the mass of the B component is bK (K is an arbitrary number, and represents a multiple factor). It is unmistakable that, unlike the parts by mass, the sum of the parts by mass of all the components is not limited to 100 parts.
"and/or" is used to indicate that one or both of the illustrated conditions may occur, e.g., a and/or B includes (a and B) and (a or B).
The application provides a method for recycling a lithium cobaltate positive plate, wherein the lithium cobaltate positive plate is formed by bonding lithium cobaltate powder under the action of a bonding agent, and then the positive material is bonded on one surface of an aluminum foil to form the lithium cobaltate positive plate, and the lithium cobaltate positive plate is mainly recycled by recycling the lithium cobaltate powder. Please refer to fig. 1, which includes:
s101: soaking in an organic solvent: and (3) soaking the lithium cobaltate positive plate in an organic solvent at a first temperature and a second temperature in sequence, and stirring in the second temperature soaking process to obtain a soaking mixture.
Specifically, the organic solvent may be N-methylpyrrolidone (NMP), Dimethylacetamide (DMAC), or the like. Preferably, the organic solvent is NMP, and the binder is dissolved by soaking in NMP, so that the separation effect of the lithium cobaltate powder and the aluminum foil is better.
Specifically, each gram of lithium cobaltate positive plate is soaked by 5-10 ml of organic solvent, namely the liquid-solid ratio is (5-10) ml: 1g, the organic solvent is ensured to completely submerge the lithium cobaltate positive electrode sheet, and may be (5, 6, 7, 8, 9 or 10) ml, or any value between 5 and 10ml, for example.
Generally, when NMP is used to dissolve the binder of the lithium cobaltate positive electrode sheet, the dissolution rate increases as the temperature increases and the stirring rate increases. However, during high-temperature stirring, due to the action of centrifugal force, the lithium cobaltate positive plate is easily stirred into a cluster, the inside of the clustered positive plate is in poor contact with NMP, and only the external part of lithium cobaltate is in contact with NMP to dissolve the binder, so that incomplete separation of lithium cobaltate powder from the aluminum foil is caused.
In the present application, two-stage soaking is adopted, the first temperature is low temperature, and the second temperature is high temperature, it should be noted that "low temperature" and "high temperature" are only relative terms of the first temperature and the second temperature. Firstly, the lithium cobaltate powder is fully contacted with NMP in a low-temperature standing and soaking mode, the wettability is good, then high-temperature soaking is carried out, strong stirring is assisted for dissolving the binder, and the dissolving effect of the binder is improved.
Preferably, the first temperature is 30 to 50 ℃, for example, (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49 or 50) ° c, or any value between 30 and 50 ℃.
Preferably, the second temperature is 60 to 95 ℃, and may be, for example, (60, 62, 64, 65, 66, 68, 69, 70, 73, 74, 76, 77, 78, 79, 80, 82, 83, 85, 87, 88, 89, 90, 92, 93 or 95) ° c, or any value between 60 and 95 ℃.
Optionally, the first temperature soaking time is 0.5 to 1 hour, for example, (0.5, 0.6, 0.7, 0.8, 0.9, or 1.0) hour, or any value between 0.5 to 1 hour. Preferably, the first temperature soaking time is 1 h.
Optionally, the second temperature soaking time is 1-2 h, for example, (1.0, 1.3, 1.5, 1.8 or 2.0) h, or any value between 1-2 h.
Optionally, the stirring speed during the second temperature soaking process is 600 to 800r/min, for example, (600, 610, 620, 630, 640, 650, 660, 670, 680, 690, 700, 710, 720, 730, 740, 750, 760, 770, 780, 790 or 800) r/min, or any value between 600 to 800 r/min. The organic solvent with too low stirring speed is not uniformly mixed with the lithium cobaltate positive plate, the stirring speed is too high, and the plate is easily stirred into a ball due to the action of centrifugal force.
More preferably, the soaked mixture obtained after soaking at the second temperature continues to be dispersed using the ultrasonic oscillator. When the lithium cobaltate is soaked at the second temperature, centrifugal force is generated by stirring, so that the lithium cobaltate positive plate in the organic solvent is easy to agglomerate, part of lithium cobaltate powder fragments fall off from the aluminum foil but are wrapped in the aluminum foil, and the lithium cobaltate positive plate can randomly move in a liquid phase by ultrasonic oscillation, so that the agglomerated pole pieces are dispersed, the wrapped part of lithium cobaltate powder fragments are released, and the soaking effect is improved.
Optionally, the step of crushing before soaking in the organic solvent comprises: and crushing the lithium cobaltate positive plate into fragments of 20-35 mm. The crushed lithium cobaltate positive plate is more fully contacted with an organic solvent, so that the binder is more easily dissolved, and lithium cobaltate powder is separated.
S102: primary filtration: and filtering the soaked mixture to respectively obtain the anode aluminum sheet and the first filtrate.
And putting the soaking mixture into a primary screen for primary filtration, wherein the soaking mixture comprises solid-phase large-size aluminum foil, solid-phase small-size lithium cobaltate powder fragments and liquid-phase organic solvent in which the binder is dissolved, so that during primary filtration, a large-pore screen is used for filtration to separate the solid-phase large-size aluminum foil, and the anode aluminum foil and the first filtrate are obtained.
Preferably, the size of the mesh opening of the primary filtration is 10-15 mm, for example, (10, 11, 12, 13, 14 or 15) mm, or any value between 10-15 mm.
S103: secondary filtration: and filtering the first filtrate to respectively obtain a second filtrate and the lithium cobaltate powder as the positive electrode.
The first filtrate from which the solid phase and the large-size aluminum foil are separated includes solid-phase and small-size lithium cobaltate powder fragments and liquid-phase organic solvent in which the binder is dissolved, so that, during the secondary filtration, a small-pore screen is used for filtration to separate the solid-phase and small-size lithium cobaltate powder fragments and the liquid-phase organic solvent in which the binder is dissolved, and a second filtrate and positive-electrode lithium cobaltate powder are obtained.
Preferably, the size of the pores of the screen for the secondary filtration is 2-5 mm, and may be (2, 2.5, 3, 3.5, 4, 4.5 or 5) mm, or any value between 2-5 mm.
S104: reduction leaching: and leaching the positive lithium cobaltate powder in a sulfuric acid and hydrogen peroxide system to obtain cobalt and lithium.
And through reduction leaching, the cobalt and the lithium in the positive electrode lithium cobaltate powder enter a leaching solution for subsequent recovery. Specifically, the molar ratio of sulfuric acid to hydrogen peroxide in the sulfuric acid + hydrogen peroxide system is 1: (0.4 to 0.6), for example, it may be 1: (0.4, 0.45, 0.5, 0.55, or 0.6), or 1: (0.4-0.6). Specifically, each gram of the positive electrode lithium cobaltate powder is leached in a sulfuric acid + hydrogen peroxide system of 3-5 ml, namely the liquid-solid ratio is (3-5) ml: 1g of the total weight of the composition.
Specifically, the reduction leaching temperature is 60 to 90 ℃, and may be, for example, (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, or 90) ° c, or any value between 60 and 90 ℃. The reduction leaching time is 1-2 h, for example, (1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0) h or any value between 1-2 h.
Embodiments of the present application will be described in detail below with reference to specific examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
10Kg of lithium cobaltate positive plate (containing 47% of cobalt and 5.6% of lithium) is placed in a crusher to be crushed into 20mm, and the crushed material is placed in a crusher with a liquid-solid ratio of 5 ml: soaking the solution in 1g NMP solution container at 50 deg.C for 30min, soaking at 85 deg.C for 1h, stirring at 600r/min, and stripping with ultrasonic oscillator. Putting the soaked mixture in the container into a primary screen with the pore size of 10mm for primary filtration, filtering out positive aluminum sheets and a first filtrate, drying the positive aluminum sheets, weighing, and weighing 1.77 Kg. Continuously filtering the first filtrate by a secondary screen with the pore size of 3mm, and filtering to obtain a second filtrate and positive lithium cobalt oxide powder; washing the anode lithium cobaltate powder with water, and then adding sulfuric acid and hydrogen peroxide in a molar ratio of 1: in a 0.5 sulfuric acid + hydrogen peroxide system, the ratio of liquid to solid is 4 ml: 1g, and efficiently leaching for 2 hours at 90 ℃ to obtain 32.7L of leachate.
The leaching solution contains 142.5g/l of cobalt and 16.91g/l of lithium, and the extraction rates of the cobalt and the lithium are both more than 99%. The method for recovering the lithium cobaltate positive plate in the embodiment 1 is proved to have good cobalt and lithium recovering effect.
Example 2
Putting 10Kg of lithium cobaltate positive plate (containing 47% of cobalt and 5.6% of lithium) into a crusher to be crushed into 35mm, putting the crushed material into a crusher with a liquid-solid ratio of 10 ml: soaking the solution in 1g NMP solution container at 45 deg.C for 1 hr, soaking at 75 deg.C for 1.5 hr, stirring at 800r/min, and stripping with ultrasonic oscillator. Putting the soaked mixture in the container into a primary screen with the pore size of 15mm for primary filtration, filtering out positive aluminum sheets and first filtrate, drying the positive aluminum sheets, weighing, and weighing 1.79 Kg. And continuously filtering the first filtrate by a secondary screen with the pore size of 5mm, and filtering to obtain a second filtrate and the cathode lithium cobaltate powder. Washing the anode lithium cobaltate powder with water, and then adding sulfuric acid and hydrogen peroxide in a molar ratio of 1: in a 0.5 sulfuric acid + hydrogen peroxide system, the ratio of liquid to solid is 5 ml: 1g, and leaching for 2 hours at 80 ℃ to obtain 40.9L of leachate.
The leaching solution contains 113.66g/l of cobalt and 13.48g/l of lithium, and the extraction rates of the cobalt and the lithium are both more than 99%. The method for recovering the lithium cobaltate positive plate in the embodiment 2 is proved to have good cobalt and lithium recovering effect.
Example 3
Putting 10Kg of lithium cobaltate positive plate (containing 47% of cobalt and 5.6% of lithium) into a crusher to be crushed into 25mm, putting the crushed material into a crusher with a liquid-solid ratio of 8 ml: soaking the solution in 1g NMP solution container at 35 deg.C for 0.8h, soaking at 90 deg.C for 2.0h, stirring at 700r/min, and stripping with ultrasonic oscillator. Putting the soaked mixture in the container into a primary screen with the pore size of 12mm for primary filtration, filtering out positive aluminum sheets and first filtrate, drying the positive aluminum sheets, weighing, and weighing 1.8 Kg. And continuously filtering the first filtrate by a secondary screen with the pore size of 3mm, and filtering to obtain a second filtrate and the cathode lithium cobaltate powder. Washing the anode lithium cobaltate powder with water, and then adding sulfuric acid and hydrogen peroxide in a molar ratio of 1: in a 0.5 sulfuric acid + hydrogen peroxide system, the ratio of liquid to solid is 3 ml: 1g, and efficiently leaching for 2 hours at 85 ℃ to obtain 24L of leachate.
The leaching solution contains 193.46g/l of cobalt and 22.95g/l of lithium, and the extraction rates of the cobalt and the lithium are both more than 99 percent. The method for recovering the lithium cobaltate positive plate in the embodiment 3 is proved to have good cobalt and lithium recovering effect.
Comparative example 1
Putting 10Kg of lithium cobaltate positive plate (containing 47% of cobalt and 5.6% of lithium) into a crusher to be crushed into 25mm, putting the crushed material into a crusher with a liquid-solid ratio of 8 ml: soaking the solution in 1g NMP solution container at 35 deg.C for 0.8h, stirring at 700r/min, and stripping with ultrasonic oscillator. Putting the substances in the container into a primary screen with the pore size of 12mm for primary filtration, filtering out a positive aluminum sheet and a first filtrate, wherein residual lithium cobaltate powder is still adhered to the positive aluminum sheet, and weighing the positive aluminum sheet after drying, wherein the weight of the positive aluminum sheet is 5.08 Kg. And continuously filtering the first filtrate by a secondary screen with the pore size of 3mm, and filtering to obtain a second filtrate and the cathode lithium cobaltate powder. Washing the anode lithium cobaltate powder with water, and then adding sulfuric acid and hydrogen peroxide in a molar ratio of 1: in a 0.5 sulfuric acid + hydrogen peroxide system, the ratio of liquid to solid is 3 ml: 1g, and carrying out high-efficiency leaching at 85 ℃ for 2 hours to obtain 14.5L of leaching solution.
The leaching solution contains 192.05g/l of cobalt and 22.85g/l of lithium, and the extraction rates of the cobalt and the lithium are both 59 percent. Comparative example 1 does not soak and dissolve the binder at a high temperature, and the lithium cobaltate powder is not completely separated from the aluminum sheet of the positive electrode due to poor dissolution effect of the binder, so that the cobalt and lithium recovery effect is not as good as that of the above examples.
Comparative example 2
Putting 10Kg of lithium cobaltate positive plate (containing 47% of cobalt and 5.6% of lithium) into a crusher to be crushed into 25mm, putting the crushed material into a crusher with a liquid-solid ratio of 8 ml: soaking the solution in 1g NMP solution container at 90 deg.C for 2.0h, stirring at 700r/min, and stripping with ultrasonic oscillator. Putting the soaked mixture substance in the container into a primary screen with the pore size of 12mm for primary filtration, filtering out a positive aluminum sheet and a first filtrate, wherein a small amount of residual lithium cobaltate powder is still adhered to the positive aluminum sheet, and weighing the positive aluminum sheet after drying, wherein the weight of the positive aluminum sheet is 2.62 Kg. Continuously filtering the first filtrate by a secondary screen with the pore size of 3mm, and filtering to obtain a second filtrate and positive lithium cobalt oxide powder; washing the anode lithium cobaltate powder with water, and then adding sulfuric acid and hydrogen peroxide in a molar ratio of 1: in a 0.5 sulfuric acid + hydrogen peroxide system, the ratio of liquid to solid is 3 ml: 1g, and efficiently leaching for 2 hours at 85 ℃ to obtain 22L of leachate.
The leaching solution contains 192.46g/l of cobalt and 22.97g/l of lithium, and the extraction rate of cobalt and lithium reaches 90 percent. Therefore, the extraction rate of cobalt and lithium is reduced compared with the above embodiment without a low-temperature soaking process, and the low-temperature soaking process is proved to ensure that all lithium cobaltate powder is fully contacted with an organic solvent, so that the wettability is good, the solubility of a binder is good, and the extraction rate of cobalt and lithium can be really improved.
Comparative example 3
Putting 10Kg of lithium cobaltate positive plate (containing 47% of cobalt and 5.6% of lithium) into a crusher to be crushed into 25mm, putting the crushed material into a crusher with a liquid-solid ratio of 8 ml: soaking the solution in 1g NMP solution container at 35 deg.C for 0.8h, and soaking at 90 deg.C for 2.0h, stirring at 700 r/min. After soaking, putting the soaked mixture in the container into a primary screen with the pore size of 12mm for primary filtration, filtering out a positive aluminum sheet and a first filtrate, wherein a very small amount of residual lithium cobaltate powder is still adhered to the positive aluminum sheet, and weighing the positive aluminum sheet after drying, wherein the weight of the positive aluminum sheet is 2.21 Kg. And continuously filtering the first filtrate by a secondary screen with the pore size of 3mm, and filtering to obtain a second filtrate and the cathode lithium cobaltate powder. Washing the anode lithium cobaltate powder with water, and then adding sulfuric acid and hydrogen peroxide in a molar ratio of 1: in a 0.5 sulfuric acid + hydrogen peroxide system, the ratio of liquid to solid is 3 ml: 1g, and performing high-efficiency leaching at 85 ℃ for 2 hours to obtain 23.1L of leaching solution.
The leaching solution contains 190.95g/l of cobalt and 22.65g/l of lithium, and the extraction rate of cobalt and lithium reaches 93 percent. It can be seen that the extraction rates of cobalt and lithium are better than the scheme without low-temperature soaking in comparative example 2 by using low-temperature soaking and high-temperature soaking in sequence, but compared with examples 1 to 3, ultrasonic stripping is not performed after soaking is completed, the extraction rates of cobalt and lithium are also affected, and the extraction rates of cobalt and lithium are slightly low.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Moreover, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (10)
1. A method for recovering a lithium cobaltate positive plate is characterized by comprising the following steps:
soaking in an organic solvent: soaking a lithium cobaltate positive plate in an organic solvent at a first temperature and a second temperature in sequence, and stirring in the second temperature soaking process to obtain a soaking mixture;
primary filtration: filtering the soaked mixture to respectively obtain an anode aluminum sheet and a first filtrate;
secondary filtration: filtering the first filtrate to respectively obtain a second filtrate and positive lithium cobaltate powder;
reduction leaching: and leaching the positive lithium cobaltate powder in a sulfuric acid and hydrogen peroxide system to obtain cobalt and lithium.
2. The method for recovering a lithium cobaltate positive electrode sheet according to claim 1, wherein the first temperature is 30 to 50 ℃ and the second temperature is 60 to 95 ℃.
3. The method for recovering a lithium cobaltate positive electrode sheet according to claim 1, wherein the size of the mesh pores of the primary filtration is 10 to 15mm, and the size of the mesh pores of the secondary filtration is 2 to 5 mm.
4. The method for recovering a lithium cobaltate positive electrode sheet according to claim 1, wherein 5 to 10ml of the organic solvent is used for soaking each gram of the lithium cobaltate positive electrode sheet.
5. The method for recovering a lithium cobaltate positive electrode sheet according to claim 1, wherein the first-temperature soaking time is 0.5 to 1 hour, and the second-temperature soaking time is 1 to 2 hours.
6. The method for recovering a lithium cobaltate positive electrode sheet according to claim 1, wherein the soaking mixture is dispersed using an ultrasonic oscillator.
7. The method for recovering a lithium cobaltate positive electrode sheet according to claim 1, wherein the stirring speed is 600 to 800 r/min.
8. The method for recovering the lithium cobaltate positive electrode plate according to claim 1, wherein the molar ratio of sulfuric acid to hydrogen peroxide in the sulfuric acid + hydrogen peroxide system is 1: (0.4-0.6), leaching the lithium cobaltate powder in the sulfuric acid and hydrogen peroxide system in an amount of 3-5 ml per gram of the lithium cobaltate powder.
9. The method for recycling the lithium cobaltate positive electrode sheet according to claim 1, wherein the reduction leaching temperature is 60-90 ℃ and the leaching time is 1-2 hours.
10. The method for recovering a lithium cobaltate positive electrode sheet according to any one of claims 1 to 9, further comprising, before the organic solvent immersion:
crushing: and crushing the lithium cobaltate positive plate into fragments of 20-35 mm.
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