Search

CN-115764039-B - Lithium battery slurry recycling equipment and lithium battery slurry recycling method

CN115764039BCN 115764039 BCN115764039 BCN 115764039BCN-115764039-B

Abstract

The application provides lithium battery slurry recycling equipment and a lithium battery slurry recycling method, and relates to the technical field of battery material recycling equipment, wherein the lithium battery slurry recycling equipment comprises a reaction container, an oil temperature machine, a stirring mechanism, a vacuum pump, a condenser and a liquid storage tank; the oil temperature machine is used for heating materials in the reaction container to 240-250 ℃. The stirring mechanism is arranged in the inner space of the reaction container and is used for stirring materials in the reaction container in the recycling process. The vacuum pump acts on the inside of the reaction vessel to generate negative pressure. The condenser is connected between the reaction vessel and the vacuum pump. The liquid storage tank is connected between the condenser and the vacuum pump. According to the technical scheme, the high-purity N-methylpyrrolidone NMP can be separated, and the recycling of the N-methylpyrrolidone NMP is realized.

Inventors

  • Yi Shuanghua

Assignees

  • 湖南迈邦新材料科技有限公司
  • 湖南迈邦新材料科技有限公司

Dates

Publication Date
20250812
Application Date
20221130
Priority Date
20221130

Claims (8)

  1. 1. A lithium battery paste recycling apparatus, comprising: The reaction container (10) is provided with an inner space (16) for accommodating lithium battery slurry to be recycled, and the reaction container (10) is also integrated with an oil guide pipeline (11), and an oil inlet (12) and an oil outlet (13) which are communicated with the oil guide pipeline (11); The oil temperature machine (20) is connected to the oil inlet (12) and the oil outlet (13) so as to inject heat conduction oil into the oil inlet (12) and receive the heat conduction oil sent by the oil outlet (13), and the oil temperature machine (20) is used for heating materials in the reaction container (10) to 240-250 ℃; A stirring mechanism (80) arranged in the inner space (16) of the reaction vessel (10) and used for stirring materials in the reaction vessel (10) in the recovery process; A vacuum pump (30) that acts on the inside of the reaction vessel (10) to generate negative pressure; a condenser (40) connected between the reaction vessel (10) and a vacuum pump (30); A liquid storage tank (50) connected between the condenser (40) and the vacuum pump (30); A filter (70) is further connected between the condenser (40) and the reaction container (10), the filter (70) is arranged at the top of the reaction container (10) and is communicated with the internal space (16) of the reaction container (10), and an air outlet of the filter (70) is connected with the condenser (40); The lithium battery slurry recycling apparatus further includes a nitrogen generator (60) capable of generating nitrogen; A first filter (70 a) and a second filter (70 b) are arranged at the top of the reaction vessel (10), the air outlet of the first filter (70 a) is connected to the condenser (40) through a first connecting pipe (90 a), and the air outlet of the second filter (70 b) is connected to the condenser (40) through a second connecting pipe (90 b); The first connecting pipe (90 a) is provided with a first three-way valve (91), a first interface of the first three-way valve (91) is connected with the first filter (70 a), a second interface is connected with the condenser (40), a third interface is connected with the nitrogen generator (60), the first three-way valve (91) has a first working state and a second working state, when the first three-way valve (91) is adjusted to the first working state, the first three-way valve (91) is adjusted to enable the first interface to be not communicated with the second interface, the first interface is communicated with the third interface, the second interface is not communicated with the third interface, when the first three-way valve (91) is adjusted to the second working state, the first three-way valve (91) is adjusted to enable the first interface to be communicated with the second interface, the first interface is not communicated with the third interface, and the second interface is not communicated with the third interface; The second connecting pipe (90 b) is provided with a second three-way valve (92), a first interface of the second three-way valve (92) is connected with the second filter (70 b), the second interface is connected with the condenser (40), and a third interface is connected with the nitrogen generator (60), the second three-way valve (92) has a first working state and a second working state, when the second three-way valve (92) is adjusted to the first working state, the second three-way valve (92) is adjusted to enable the first interface to be not communicated with the second interface, the first interface is communicated with the third interface, the second interface is not communicated with the third interface, when the second three-way valve (92) is adjusted to the second working state, the second three-way valve (92) is adjusted to enable the first interface to be communicated with the second interface, the first interface is not communicated with the third interface, and the second interface is not communicated with the third interface; When the nitrogen generator (60) is started, the first three-way valve (91) is circularly switched between a first working state and a second working state, the second three-way valve (92) is circularly switched between the first working state and the second working state, and when the first three-way valve (91) is positioned in the first working state, the second three-way valve (92) is positioned in the second working state, and when the first three-way valve (91) is positioned in the second working state, the second three-way valve (92) is positioned in the first working state.
  2. 2. The lithium battery slurry recovery apparatus according to claim 1, wherein the stirring mechanism (80) includes: A stirring shaft (81) which is horizontally and hermetically arranged on the reaction vessel (10) and transversely passes through the inner space (16) of the reaction vessel (10), and the first end and the second end of the stirring shaft extend out of the reaction vessel (10) from two sides respectively; a stirring blade (82) which is installed above the stirring shaft (81) and can synchronously rotate along with the stirring shaft (81) to stir the materials in the reaction vessel (10); A first support base (83) arranged outside the reaction vessel (10) for rotatably supporting a first end of the stirring shaft (81); a second support base (84) arranged outside the reaction vessel (10) for rotatably supporting the second end of the stirring shaft (81); the driving source (85) is arranged outside the reaction container (10), and is in power connection with the first end of the stirring shaft (81) so as to be used for driving the stirring shaft (81) to rotate.
  3. 3. The lithium battery slurry recovery apparatus according to claim 2, characterized in that a high-temperature sealing structure (86) is provided between the stirring shaft (81) and the reaction vessel (10); the high temperature seal structure (86) includes: A sealing cavity (861) mounted on the reaction vessel (10), the sealing cavity (861) surrounding the periphery of the stirring shaft (81), and having an oil inlet (8611) for injecting lubricating oil and an oil outlet (8612) for discharging lubricating oil disposed thereon; A sealing ring arranged inside the sealing cavity (861) and surrounding the periphery of the stirring shaft (81), wherein the sealing ring comprises a static ring (862) and a movable ring (863), the static ring (862) is attached on the sealing cavity (861) to keep static, the movable ring (863) is installed on the stirring shaft (81) to rotate along with the stirring shaft (81), and a seal is formed between the static ring (862) and the movable ring (863).
  4. 4. The lithium battery slurry recovery apparatus according to claim 3, wherein the stationary ring (862) includes an upper stationary ring (862 a) and a lower stationary ring (862 b), the movable ring (863) is located between the upper stationary ring (862 a) and the lower stationary ring (862 b), and includes an upper movable ring (863 a) fitted with the upper stationary ring (862 a), and a lower movable ring (863 b) fitted with the lower stationary ring (862 b); The high temperature sealing structure (86) further includes a ring mounting structure (864) for mounting the upper ring (863 a) and the lower ring (863 b).
  5. 5. A lithium battery slurry recycling apparatus according to claim 3, characterized in that the inside of the sealing cavity (861) is provided with a cooling channel (8613) in a circumferential direction and is provided with a cooling liquid inlet (8614) and a cooling liquid outlet (8615) which are communicated with the cooling channel (8613), and the positions of the cooling liquid inlet (8614) and the cooling liquid outlet (8615) are symmetrically arranged with respect to the axis of the stirring shaft (81).
  6. 6. The lithium battery slurry recycling device according to claim 2, wherein the top of the reaction vessel (10) is provided with a feed inlet (14), and the middle position of the bottom is provided with a discharge outlet (15); the stirring blades (82) comprise a first stirring blade (821) positioned on the left side of the discharge hole (15) and a second stirring blade (822) positioned on the right side of the discharge hole (15), deflection directions of the first stirring blade (821) and the second stirring blade (822) are opposite, the first stirring blade (821) stirs materials positioned on the left side of the discharge hole (15) and promotes the materials to move to the right along with rotation of the first stirring blade (821), and the second stirring blade (822) stirs the materials positioned on the right side of the discharge hole (15) and promotes the materials to move to the left along with rotation of the second stirring blade (822).
  7. 7. The lithium battery slurry recycling device according to claim 1, characterized in that the vacuum pump (30) is further connected with an exhaust gas treatment device.
  8. 8. A lithium battery slurry recycling method, characterized in that the lithium battery slurry recycling method is applied to the lithium battery slurry recycling apparatus according to any one of claims 1 to 7, comprising the steps of: controlling a vacuum pump (30) to act on the inside of the reaction vessel (10) so as to generate negative pressure; Controlling an oil temperature machine (20) to heat materials in the reaction container (10) to 240-250 ℃; controlling the stirring mechanism (80) to stir the materials in the reaction vessel (10); The condenser (40) is controlled to cool the gas evaporated from the reaction vessel (10) so as to condense the N-methylpyrrolidone NMP.

Description

Lithium battery slurry recycling equipment and lithium battery slurry recycling method Technical Field The application relates to the technical field of battery material recycling equipment, in particular to lithium battery slurry recycling equipment and a lithium battery slurry recycling method. Background New energy is a direction of future development, and a battery is one of important implementation means of new energy. The lithium battery comprises a positive electrode and a negative electrode, wherein in the process of coating and manufacturing the positive electrode and the negative electrode, positive electrode slurry is required to be coated on a positive electrode aluminum foil, and graphite is required to be coated on a negative electrode copper foil. NMP is used as one of the main raw materials in the manufacturing process of the lithium ion battery, and directly influences the requirements of the lithium ion battery on the coating quality of the slurry and the environmental protection. In the process of coating the positive electrode, the positive electrode material and N-methylpyrrolidone NMP are required to be mixed in a stirring tank, but after the mixture is used, the unused slurry can be stuck on the inner surface of the stirring tank, the stirring tank needs to be cleaned in time, the N-methylpyrrolidone NMP is added in the stirring tank again in the cleaning process, the residues on the inner surface of the reaction container are washed away, and the washed N-methylpyrrolidone NMP solution also contains available powder. Therefore, the cleaned solution is poured out of the reaction kettle, ice is stored in a fixed container, but how to treat the solution and separate the liquid and the powder from each other for recycling is an important subject in front of enterprises. The existing method for treating the cleaning waste liquid mainly comprises the following steps: The first precipitation method adopts flocculating agent precipitation, and the black NMP solvent is subjected to solid-liquid separation by adding chemical precipitant, so that NMP waste liquid and wet slurry are separated, the NMP waste liquid can reach the utilization standard, the slurry can only be burnt to be changed into a massive metal material and can not be powdery, the slurry is crushed and ball-milled by equipment to be powdery, and the NMP in the slurry can pollute the environment after being burnt. And secondly, directly burning off by a dry burning method to obtain the metal material inside, wherein NMP inside cannot be recovered at all. Thirdly, the slurry is subjected to pressure filtration to separate a part of NMP from the slurry through a pressure filter, the NMP is still black and needs to be reprocessed into NMP waste liquid, the filtered solid also contains a part of NMP, and the metal materials in the solid need to be extracted after combustion. The above process ignores recycling of N-methylpyrrolidone (NMP), or the purity of the separated N-methylpyrrolidone (NMP) often cannot meet the use requirement. Disclosure of Invention The technical problem to be solved by the application is to provide lithium battery slurry recycling equipment and a lithium battery slurry recycling method aiming at the defects in the prior art. A lithium battery slurry recycling apparatus comprising: The reaction container is provided with an inner space for accommodating lithium battery slurry to be recovered, and is also integrated with an oil guide pipeline, and an oil inlet and an oil outlet which are communicated with the oil guide pipeline; The oil temperature machine is connected with the oil inlet and the oil outlet, so as to inject heat conduction oil into the oil inlet and receive the heat conduction oil sent by the oil outlet, and is used for heating materials in the reaction container to 240-250 ℃; The stirring mechanism is arranged in the inner space of the reaction container and is used for stirring materials in the reaction container in the recovery process; a vacuum pump acting on the inside of the reaction vessel to generate negative pressure; the condenser is connected between the reaction container and the vacuum pump; The liquid storage tank is connected between the condenser and the vacuum pump. In an improved technical scheme, the stirring mechanism comprises: The stirring shaft is transversely arranged on the reaction container in a sealing way, transversely passes through the internal space of the reaction container, and the first end and the second end of the stirring shaft extend out of the reaction container from two sides respectively; The stirring blade is arranged on the stirring shaft and can synchronously rotate along with the stirring shaft so as to stir materials in the reaction container; The first supporting seat is arranged outside the reaction container and is used for rotatably supporting the first end of the stirring shaft; the second supporting seat is arranged outside the reaction cont