CN114335786A - Method and device for regenerating lithium iron phosphate anode material - Google Patents
Method and device for regenerating lithium iron phosphate anode material Download PDFInfo
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- Y02W30/84—Recycling of batteries or fuel cells
Abstract
The invention relates to a method and a device for regenerating a lithium iron phosphate cathode material, wherein the method comprises the following steps: placing the sheared positive plate of the lithium battery in a phosphoric acid solution, adding a certain amount of hydrogen peroxide for soaking and separating, separating and screening out an aluminum foil current collector, and oxidizing and roasting the obtained battery black powder part to obtain iron phosphate calcine containing a certain amount of lithium; adjusting the pH value of the obtained solution to remove impurities, heating the solution after the impurities are removed, adding a sodium carbonate solution, and filtering lithium carbonate; grinding the obtained calcine and dried and then the obtained calcine and lithium carbonate and carbon powder obtained in S4 according to LiFePO4The molecular formula is prepared, mixed evenly and then placed in a micro-reactorAnd reducing and roasting in a wave furnace to obtain the lithium iron phosphate anode material. The method has the advantages of simple process, convenience in operation, low energy consumption, no introduction of other impurities, no secondary pollution, avoidance of waste of lithium iron phosphate battery waste resources, waste turning into wealth, full utilization of natural resources, realization of conversion from waste products to products, purity of the prepared lithium iron phosphate anode material and remarkable economic benefit.
Description
Technical Field
The invention relates to a method and a device for regenerating a lithium iron phosphate positive electrode material, belongs to the technical field of regeneration resource circulation, and particularly relates to a method and a device for recycling a lithium iron phosphate positive electrode plate.
Background
Lithium iron phosphate is also called lithium iron phosphate, and is a reversible deintercalation Li with a unique olivine structure+The anode material has sufficient raw material content and low price. Lithium iron phosphate is more and more favored by people due to the advantages of high theoretical specific capacity, stable charge and discharge, good cycle performance, high safety factor and the like. According to research, the quantity of new energy automobiles in China in 2030 years is expected to reach 9500W, the driving sources used by most new energy automobiles at present are lithium iron phosphate batteries, the theoretical life of the lithium iron phosphate batteries is only 7-8 years, so that large quantities of lithium iron phosphate leftover materials and waste lithium iron phosphate batteries are generated due to large consumption, and huge environmental pollution and resource waste can be caused if the waste accumulated large leftover materials and lithium batteries cannot be effectively treated.
At present, aiming at a large number of lithium iron phosphate batteries, the main recovery process comprises the following steps: after discharging, crushing and sorting out the anode material, the anode material is recovered, and lithium, iron and the like in the lithium iron phosphate are generally recovered and reused in a hydrometallurgy mode.
In the patent of application number "CN 2021107885608", a method for recycling a waste lithium iron phosphate positive electrode material is provided, in which an organic solvent is used to strip a current collector of a lithium iron phosphate positive plate or a leftover material, a leaching agent and hydrogen peroxide are added to lithium iron phosphate powder to carry out lithium leaching, a lithium leaching solution and iron phosphate are obtained, and the lithium iron phosphate positive electrode material is prepared by using sodium carbonate and the iron phosphate as raw materials after lithium precipitation. Compared with the method, the method adopts the combination of phosphoric acid and hydrogen peroxide, adopts hydrogen peroxide to destroy the structure of the lithium iron phosphate, does not introduce new impurities, adopts ultrasonic external field to strengthen separation, obviously shortens the separation time, has the function of refining black powder, and makes the black powder of the lithium iron phosphate battery and the separated aluminum foil easier to separate.
The patent of application number "CN 202011565355.7" provides a recovery method and application of a lithium iron phosphate positive plate, the method comprises the steps of putting the lithium iron phosphate positive plate into a mixed solution of hydrogen peroxide and water, separating a positive material from a foil by ultrasonic magnetic field oscillation, and adding the obtained lithium-poor lithium iron phosphate paste into a lithium hydroxide solution under an ultrasonic external field for lithium supplement, washing and drying to obtain repaired lithium iron phosphate. Compared with the method, the method adopts the phosphoric acid solution for separating the current collector aluminum foil and the battery black powder, further weakens the loss of iron, does not introduce impurities, oxidizes iron in the lithium iron phosphate into ferric iron by hydrogen peroxide, enters the solution, forms iron phosphate precipitate and returns the iron phosphate precipitate to the black powder enrichment, uses the ultrasonic external field to strengthen the separation, obviously shortens the separation time, and simultaneously has the function of refining the black powder, so that the lithium iron phosphate battery black powder and the separated aluminum foil are easier to separate.
In the patent of application number "CN 202010804187.6", a method for efficiently treating waste lithium iron phosphate positive plates is provided, the method comprises the steps of adding the lithium iron phosphate positive plates into formic acid solution, adding hydrogen peroxide as an oxidant, drying and sintering obtained filter residues to obtain high-purity iron phosphate, and adding sodium carbonate to precipitate lithium after lithium-containing solution is evaporated and concentrated to obtain high-purity lithium carbonate. Compared with the method, the method adopts the combination of phosphoric acid and hydrogen peroxide, adopts hydrogen peroxide to destroy the structure of the lithium iron phosphate, does not introduce new impurities, adopts ultrasonic external field to strengthen separation, obviously shortens the separation time, has the function of refining black powder, and makes the black powder of the lithium iron phosphate battery and the separated aluminum foil easier to separate.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides a method and a device for regenerating a lithium iron phosphate positive electrode material. The method adopts the step of separating the aluminum foil and the black powder of the positive plate by a phosphoric acid and hydrogen peroxide system, realizes the quick separation of the aluminum foil and the black powder under the reinforcement of an ultrasonic external field, and simultaneously uses the strong stirring action of ultrasonic waves to smash a large number of black blocky black powder materials, but the aluminum foil can not smash, so as to realize the separation of the aluminum foil and the black powder materials; simultaneously, rapidly burning off the binder in the separated battery black powder by adopting microwave oxidation roasting to obtain iron phosphate calcine containing a certain amount of lithium; meanwhile, the invention adopts an ultrasonic external field to strengthen the lithium precipitation effect of the sodium carbonate and accelerate the precipitation of lithium carbonate; finally, mixing and ball-milling according to the formula ratio of the lithium iron phosphate, placing the powder material in a microwave oven for reduction roasting, and sintering the positive electrode material of the lithium iron phosphate battery while rapidly reducing the iron phosphate into ferrous phosphate by using microwaves through carbon heat.
The method changes the harm into the treasure, realizes the comprehensive utilization of natural resources, is beneficial to relieving the pressure of resources and environment, and has excellent economic and ecological benefits.
The method for regenerating the lithium iron phosphate positive electrode material is characterized by comprising the following steps of:
s1, placing the sheared positive plate of the lithium battery in a dilute phosphoric acid solution, and adding a certain amount of hydrogen peroxide for soaking;
s2, separating and screening out the aluminum foil current collector, performing solid-liquid separation, performing water washing on the black powder part, and washing filter residues with pure water;
s3, oxidizing and roasting the S2 filter residue;
s4, adjusting the pH of the mixed solution obtained in the step S2, removing impurities, heating, adding a hot sodium carbonate solution, filtering lithium carbonate, washing filter residues, and returning washing water to the step S1;
and S5, uniformly mixing the calcine obtained in the S3 with lithium carbonate, glucose, acetylene black and the like obtained in the S4 according to a certain proportion, ball-milling, and placing in a microwave oven for reduction roasting to obtain the lithium iron phosphate.
The method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: the lithium battery positive electrode material is a lithium iron phosphate leftover material or an unqualified product in the production process or a positive electrode material obtained by disassembling a waste lithium iron phosphate battery;
the method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: in S1, cutting the lithium iron phosphate to the size of 1.0cm by 1.0cm-5.0cm by 5.0 cm;
the method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: the concentration of the phosphoric acid solution in the S1 is 0.2-1.5mol/L, and the adding amount of the hydrogen peroxide is as follows: 1-10%, and the solid-liquid ratio is: 1: 2-1: 10;
the method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: in S1, ultrasonic oscillation is adopted, the ultrasonic power is 100-1000W, and the separation time is 3-15 min;
the method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: and S3, roasting in a microwave muffle furnace, wherein the roasting temperature is as follows: 200 and 450 ℃, the air flow rate is 5.0-15.0mL/s, the time: 0.5-2H, power: 1.0-3.0 kw;
the method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: adjusting pH to 3-4 with sodium hydroxide solution, and filtering;
the method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: in S4, heating the mixed solution to 80-90 ℃, and adding 80-90 ℃ of hot sodium carbonate solution;
the method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: s4 is mixed by oscillation under the ultrasonic external field, the ultrasonic power is 100-;
the method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: the certain proportion of S5 is supplemented according to the atomic proportion in the molecular formula of LiFePO4, wherein the iron phosphate: the lithium carbonate proportion is 1-1.1: 1-1.2, and adding 5-10% of glucose and acetylene black as a reducing agent and a conductive agent, wherein the adding amount of the glucose and the acetylene black is 0.9-1.1: 1-1.2;
the method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: the reduction roasting adopts one or more of hydrogen, nitrogen or argon as a reduction protective atmosphere, and the microwave power is as follows: 1.0-3.0kW, roasting temperature: 600 ℃ and 750 ℃, and the roasting time is 2-30 min;
the device for regenerating the lithium iron phosphate cathode material is characterized in that the recovery device comprises:
the shearing unit (1) is provided with a positive plate shearing feeding hole and a positive plate shearing discharging hole and is conveyed to the sorting unit (2) through a conveying belt, and the shearing unit is used for shearing the lithium iron phosphate positive plate;
the sorting unit (2) is provided with a feed inlet, a liquid inlet 1 and a liquid inlet 2, the sorting unit is of a double-layer structure, an aluminum foil current collector recovery device is arranged on an inner layer, and the sorting unit realizes automatic separation of black powder and the aluminum foil current collector;
the reinforced stirring unit (3) is arranged in the inner layer of the sorting unit, and the ultrasonic device is used for refining black powder particles to realize the separation of the black powder mixed solution and the aluminum foil current collector;
the black powder recovery unit (4) is connected with the sorting unit and is provided with a liquid outlet and a slag outlet, the slag outlet is provided with a water washing-filter pressing unit, and the black powder recovery unit is used for separating a black powder mixed solution;
the microwave roasting device (5) is provided with an atmosphere control device, slag obtained from a slag outlet enters the device, roasting with different requirements is realized by controlling the atmosphere in a microwave oven, and the microwave device is mainly used for black powder oxidizing roasting and lithium iron phosphate anode material preparation;
the lithium recovery device (6) is connected with a liquid outlet of the black powder recovery unit and a discharge outlet of black powder washing water, and is mainly used for removing impurities and purifying lithium-containing solution;
the anode material preparation unit (7) is connected with the lithium recovery unit and the microwave roasting device and comprises a weighing device, a material mixing device and a ball milling device;
the device of claim 13, wherein the aluminum foil current collector recovery device is a porous structure and has a lifting device and an aluminum foil discharge port, black powder flows out of the pores, and the aluminum foil remains in the device to separate the aluminum foil from the black powder;
the apparatus according to claim 13, wherein the intensive mixing unit (3) comprises: the ultrasonic device and the mechanical stirring device are fixed on the lifting device, and after the lithium iron phosphate black powder is refined by the reinforced stirring device, the black powder flows out of the porous structure of the current collector recovery device;
the apparatus according to claim 13, wherein the black powder recovery unit (4) comprises: the water outlet of the filter press is connected with the lithium recovery unit;
the apparatus according to claim 13, wherein said microwave roasting means (5) comprises: the device can realize the functions of oxidizing roasting, reducing roasting and the like;
the apparatus according to claim 13, wherein said microwave roasting means (5) further comprises a tail gas treatment means;
the apparatus according to claim 13, wherein said lithium recovery device (6) comprises: impurity removing device, filtering device, heating device and liquid inlet; the impurity removing device also comprises a pH meter and a sodium hydroxide solution metering pump;
the apparatus of claims 13-14, wherein: a waste gas absorption device, particularly an acid gas absorption tower, is also included;
the apparatus of claims 13-14, wherein: the device can realize the separation of black powder and a current collector, including but not limited to a lithium iron phosphate battery or a positive plate or a leftover material of the lithium iron phosphate battery, and is also suitable for the separation of other lithium ion battery current collectors from the black powder or the separation of similar structures;
the invention has the beneficial effects that:
1) the conversion from waste products to products is realized. The waste material of the lithium iron phosphate anode is converted into the qualified lithium iron phosphate anode material, and the method has obvious economic benefit.
2) No new impurities are introduced. The phosphoric acid, the sodium carbonate and the like used in the invention are one of the components of the lithium iron phosphate battery, and other impurities are not introduced, so that the purity of the product is ensured.
3) The high-efficiency separation of the black powder and the aluminum foil is realized by adopting ultrasonic oscillation and crushing effects, and the operation is simple and convenient for industrialization and automation.
4) The preparation of the lithium iron phosphate anode material is realized by introducing microwave oxidation roasting to remove black powder binder and microwave reduction roasting, and the method is clean, efficient and convenient for industrialization and automation.
Drawings
Fig. 1 is a process flow diagram of the method, fig. 2 is a connection schematic diagram of the process units, and fig. 3 is a structural schematic diagram of a black powder and aluminum foil separation device.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The invention is further described with reference to the following drawings and detailed description.
Example 1
The present embodiment adopts leftover materials of positive electrode materials of lithium iron phosphate batteries.
S1, shearing the leftover materials to 2.0cm by 2.0cm through a shearing unit (1), adding 0.4mol/L phosphoric acid solution and 2% hydrogen peroxide, starting a reinforced stirring unit (3), and carrying out ultrasonic intensity on the mixture to be 1 kW;
s2, after 12min, separating the aluminum foil from the black powder, carrying out solid-liquid separation on the black powder mixed solution after removing the aluminum foil, and washing filter residue with 10% pure water after the separation is finished;
s3, placing the washed filter residue in a microwave oven for oxidizing roasting to remove the binder, wherein the oxidizing roasting conditions are as follows: roasting temperature: the air flow rate is 5.0ml/s at 250 ℃; roasting time: 1.0H, power: 2.0 kW;
s4, adjusting the pH value of the solution obtained in the step 2 to 4.0, filtering, boiling the obtained filtrate to 90 ℃, adding a 90 ℃ saturated sodium carbonate solution, starting an ultrasonic device for 20min, standing for 1H to precipitate lithium, and filtering lithium carbonate after precipitation is finished.
S5, mixing the calcine obtained in the step S3 and the lithium carbonate obtained in the step S4 uniformly, adding 5% of mixed powder of glucose and acetylene black, mixing uniformly, ball-milling to 200 meshes, placing the obtained mixture in a microwave oven for reduction roasting, wherein the reduction roasting conditions are as follows: roasting temperature: 650 ℃, protective atmosphere is: nitrogen with a flow rate of 1.0 ml/s; roasting time: 1.0H, power: 2.0 kW.
After the treatment, the prepared lithium iron phosphate can be used as a positive electrode material of a lithium iron phosphate battery.
Example 2
The raw material of the embodiment is a waste lithium iron phosphate battery cathode material.
S1, shearing the leftover materials to 3.5cm by 3.5cm through the shearing unit (1), adding 0.2mol/L phosphoric acid solution and 5% hydrogen peroxide, starting the reinforced stirring unit (3), and enabling the ultrasonic intensity to be 1 kW;
s2, after 15min, separating the aluminum foil from the black powder, carrying out solid-liquid separation on the black powder mixed solution after removing the aluminum foil, and washing filter residue with 10% pure water after the separation is finished;
s3, placing the washed filter residue in a microwave oven for oxidizing roasting to remove the binder, wherein the oxidizing roasting conditions are as follows: roasting temperature: the air flow rate is 5.0ml/s at 250 ℃; roasting time: 1.15H, power: 2.0 kW;
s4, adjusting the pH value of the solution obtained in the step 2 to 4.0, filtering, boiling the obtained filtrate to 90 ℃, adding a 90 ℃ saturated sodium carbonate solution, starting an ultrasonic device for 20min, standing for 1H to precipitate lithium, and filtering lithium carbonate after precipitation is finished.
S5, mixing the calcine obtained in the step S3 and the lithium carbonate obtained in the step S4 uniformly, adding 10% of mixed powder of glucose and acetylene black, mixing uniformly, ball-milling to 200 meshes, placing the obtained mixture in a microwave oven for reduction roasting, wherein the reduction roasting conditions are as follows: roasting temperature: and the protective atmosphere is as follows at 750 ℃: nitrogen with a flow rate of 1.0 ml/s; roasting time: 1.0H, power: 2.0 kW.
After the treatment, the prepared lithium iron phosphate can be used as a positive electrode material of a lithium iron phosphate battery.
Example 3
The present embodiment adopts leftover materials of positive electrode materials of lithium iron phosphate batteries.
S1, shearing the leftover materials to 2.0cm by 2.0cm through a shearing unit (1), and adding 0.5mol/L phosphoric acid solution;
s2, after 30min, separating the aluminum foil from the black powder, wherein the black powder is flaky, picking up the aluminum foil, carrying out solid-liquid separation on the black powder mixed solution, and washing filter residue with 10% pure water after separation;
s3, placing the washed filter residue in a microwave oven for oxidizing roasting to remove the binder, wherein the oxidizing roasting conditions are as follows: roasting temperature: the air flow rate is 5.0ml/s at 250 ℃; roasting time: 2H, power: 2.0 kW;
s4, adjusting the pH value of the solution obtained in the step 2 to 4.0, filtering, boiling the obtained filtrate to 90 ℃, adding a 90 ℃ saturated sodium carbonate solution, starting an ultrasonic device for 20min, standing for 1H to precipitate lithium, and filtering lithium carbonate after precipitation is finished.
S5, mixing the calcine obtained in the step S3 and the lithium carbonate obtained in the step S4 uniformly, adding 100% glucose and acetylene black mixed powder, mixing uniformly, ball-milling to 200 meshes, placing the obtained mixture in a microwave oven for reduction roasting, wherein the reduction roasting conditions are as follows: roasting temperature: the temperature is 700 ℃, the protective atmosphere is: nitrogen with a flow rate of 1.0 ml/s; roasting time: 1.0H, power: 2.0 kW.
After the treatment, the prepared lithium iron phosphate can be used as a positive electrode material of a lithium iron phosphate battery.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.
Claims (20)
1. The method for regenerating the lithium iron phosphate positive electrode material is characterized by comprising the following steps of:
s1, placing the sheared positive plate of the lithium battery in a dilute phosphoric acid solution, and adding a certain amount of hydrogen peroxide for soaking;
s2, separating and screening out the aluminum foil current collector, performing solid-liquid separation, performing water washing on the black powder part, and washing filter residues with pure water;
s3, oxidizing and roasting the S2 filter residue;
s4, adjusting the pH of the mixed solution obtained in the step S2, removing impurities, heating, adding a hot sodium carbonate solution, filtering lithium carbonate, washing filter residues, and returning washing water to the step S1;
and S5, uniformly mixing the calcine obtained in the S3 with lithium carbonate, glucose, acetylene black and the like obtained in the S4 according to a certain proportion, ball-milling, and placing in a microwave oven for reduction roasting to obtain the lithium iron phosphate.
2. The method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: the lithium battery positive electrode material is a lithium iron phosphate leftover material, an unqualified product in the production process or a positive electrode material obtained by disassembling a waste lithium iron phosphate battery.
3. The method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: in S1, the lithium iron phosphate was sheared to a size of 1.0cm by 1.0cm to 5.0cm by 5.0 cm.
4. The method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: the concentration of the phosphoric acid solution in the S1 is 0.2-1.5mol/L, and the adding amount of the hydrogen peroxide is as follows: 1-10%, and the solid-liquid ratio is: 1: 2-1: 10.
5. the method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: in S1, ultrasonic oscillation is adopted, the ultrasonic power is 100-1000W, and the separation time is 3-15 min.
6. The method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: and S3, roasting in a microwave muffle furnace, wherein the roasting temperature is as follows: 200 and 450 ℃, the air flow rate is 5.0-15.0mL/s, the time: 0.5-2H, power: 1.0-3.0 kw.
7. The method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: adjusting pH to 3-4 with sodium hydroxide solution, and filtering.
8. The method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: in S4, the mixed solution is heated to 80-90 ℃, and the added hot sodium carbonate solution is 80-90 ℃.
9. The method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: s4 is mixed by vibration under the ultrasonic external field, the ultrasonic power is 100-.
10. The method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: s5 in a certain proportion of LiFePO4And (2) supplementing the proportion of atoms in the molecular formula, wherein the iron phosphate: the lithium carbonate proportion is 1-1.1: 1-1.2, and 5-10% of glucose and acetylene black are added as a reducing agent and a conductive agent, wherein the adding amount of the glucose and the acetylene black is 0.9-1.1: 1-1.2.
11. The method for regenerating a lithium iron phosphate positive electrode material as recited in claim 1, characterized in that: the reduction roasting adopts one or more of hydrogen, nitrogen or argon as a reduction protective atmosphere, and the microwave power is as follows: 1.0-3.0kW, roasting temperature: 600 ℃ and 750 ℃, and the roasting time is 2-30 min.
12. The device for regenerating the lithium iron phosphate cathode material is characterized in that the recovery device comprises:
the shearing unit (1) is provided with a positive plate shearing feeding hole and a positive plate shearing discharging hole and is conveyed to the sorting unit (2) through a conveying belt, and the shearing unit is used for shearing the lithium iron phosphate positive plate;
the sorting unit (2) is provided with a feed inlet, a liquid inlet 1 and a liquid inlet 2, the sorting unit is of a double-layer structure, an aluminum foil current collector recovery device is arranged on an inner layer, and the sorting unit realizes automatic separation of black powder and the aluminum foil current collector;
the reinforced stirring unit (3) is arranged in the inner layer of the sorting unit, and the ultrasonic device is used for refining black powder particles to realize the separation of the black powder mixed solution and the aluminum foil current collector;
the black powder recovery unit (4) is connected with the sorting unit and is provided with a liquid outlet and a slag outlet, the slag outlet is provided with a water washing-filter pressing unit, and the black powder recovery unit is used for separating a black powder mixed solution;
the microwave roasting device (5) is provided with an atmosphere control device, slag obtained from a slag outlet enters the device, roasting with different requirements is realized by controlling the atmosphere in a microwave oven, and the microwave device is mainly used for black powder oxidizing roasting and lithium iron phosphate anode material preparation;
the lithium recovery device (6) is connected with a liquid outlet of the black powder recovery unit and a discharge outlet of black powder washing water, and is mainly used for removing impurities and purifying lithium-containing solution;
the anode material preparation unit (7) is connected with the lithium recovery unit and the microwave roasting device, and comprises a weighing device, a material mixing device and a ball milling device.
13. The apparatus of claim 13, wherein the aluminum foil current collector recovery device is a porous structure and has a lifting device and an aluminum foil discharge port, black powder flows out of the pores, and the aluminum foil remains in the apparatus to separate the aluminum foil from the black powder.
14. The apparatus according to claim 13, wherein the intensive mixing unit (3) comprises: the ultrasonic device and the mechanical stirring device are fixed on the lifting device, and after the lithium iron phosphate black powder is refined by the reinforced stirring device, the black powder flows out of the porous structure of the current collector recovery device.
15. The apparatus according to claim 13, wherein the black powder recovery unit (4) comprises: the water outlet of the filter press is connected with the lithium recovery unit.
16. The apparatus according to claim 13, wherein said microwave roasting means (5) comprises: oxygen cylinder and inert gas cylinder, the device can realize functions such as oxidizing roasting, reduction roasting, etc.
17. The apparatus according to claim 13, wherein said microwave roasting means (5) further comprises a tail gas treatment means.
18. The apparatus according to claim 13, wherein said lithium recovery device (6) comprises: impurity removing device, filtering device, heating device and liquid inlet; the impurity removing device also comprises a pH meter and a sodium hydroxide solution metering pump.
19. The apparatus of claims 13-14, wherein: an exhaust gas absorption device, embodied as an acid gas absorption tower, should also be included.
20. The apparatus of claims 13-14, wherein: the device can realize the separation of black powder and a current collector, including but not limited to lithium iron phosphate battery or lithium iron phosphate battery positive plate or leftover material, and is also suitable for the separation of other lithium ion battery current collectors and black powder or similar structures.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114835099A (en) * | 2022-04-21 | 2022-08-02 | 中国科学院过程工程研究所 | Recycling method and recycling system device of waste lithium iron phosphate |
| CN117673537A (en) * | 2024-01-31 | 2024-03-08 | 江苏维锂新能源材料有限公司 | Environment-friendly repair and regeneration process for lithium iron phosphate |
| CN117673537B (en) * | 2024-01-31 | 2024-04-16 | 江苏维锂新能源材料有限公司 | Environment-friendly repair and regeneration process for lithium iron phosphate |
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| CN109775678A (en) * | 2019-04-01 | 2019-05-21 | 中钢集团南京新材料研究院有限公司 | The method that battery-grade iron phosphate and PHOSPHORIC ACID TECH.GRADE lithium are prepared in waste lithium iron phosphate battery |
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| CN113501510A (en) * | 2021-07-13 | 2021-10-15 | 郑州中科新兴产业技术研究院 | Method for recycling and regenerating anode material of waste lithium iron phosphate battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114835099A (en) * | 2022-04-21 | 2022-08-02 | 中国科学院过程工程研究所 | Recycling method and recycling system device of waste lithium iron phosphate |
| CN117673537A (en) * | 2024-01-31 | 2024-03-08 | 江苏维锂新能源材料有限公司 | Environment-friendly repair and regeneration process for lithium iron phosphate |
| CN117673537B (en) * | 2024-01-31 | 2024-04-16 | 江苏维锂新能源材料有限公司 | Environment-friendly repair and regeneration process for lithium iron phosphate |
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