Iron removal device and electrode material preparation system

Abstract

The utility model discloses an iron removal device. The iron removal device comprises a first iron removal machine, a stock bin, a jet mill and a second iron removal machine. The first iron removal machine is used for removing iron from the particulate matters; the stock bin is arranged at the downstream of the first iron removal machine and is used for receiving and storing the iron-removed particulate matters; the jet mill is connected with the discharge end of the stock bin and is used for crushing the particles to generate powder; and the second iron removal machine is arranged at the downstream of the jet mill and is used for removing iron from the powder. By the adoption of the iron removal device, primary iron removal is conducted on particles through the first iron removal machine, then the particles are smashed into powder through the jet mill, and secondary iron removal is conducted on the powder through the second iron removal machine. Therefore, the metal impurities of the electrode material can be effectively removed, and the metal impurities are prevented from influencing the performance of the battery. The utility model further discloses an electrode material preparation system.

Description

Technical Field

[0001] The present application belongs to the field of powder processing technology, and specifically relates to an iron removal device and an electrode material preparation system. Background Art

[0002] Ferromagnetic metal impurities in lithium battery positive and negative electrode materials can seriously affect the battery's service life and safety. Once mixed into the positive and negative electrode materials, ferromagnetic metal impurities directly participate in electrochemical reactions, resulting in a decrease in the battery's capacity, voltage, internal resistance, and charge / discharge performance. Ferromagnetic metal impurities promote the battery's redox reaction, increasing the battery's self-discharge rate and thus reducing the battery's cycle life. Ferromagnetic metal impurities can also cause short circuits during the battery's charge and discharge process, potentially leading to overheating and reducing battery safety. Utility Model Content

[0003] Based on this, the present application provides an iron removal device and an electrode material preparation system that can remove iron from battery electrode materials to prevent metal impurities from affecting battery performance.

[0004] The technical solutions proposed in this application are:

[0005] A deironing device, comprising:

[0006] A first iron remover is used to remove iron from particulate matter;

[0007] a silo, disposed downstream of the first iron remover, for receiving and storing the iron-removed particulate matter;

[0008] an air flow mill connected to the discharge end of the silo, for crushing the particles to generate powder;

[0009] The second iron remover is arranged downstream of the air flow mill and is used for removing iron from the powder.

[0010] Furthermore, the iron removal device also includes a granulator, which is arranged upstream of the first iron remover and is used to granulate the raw material to generate the particulate matter.

[0011] Furthermore, the air flow pulverizer includes a crushing section and a grading section. The crushing section is connected to the discharge end of the hopper and is used to crush the particulate matter to generate the powder. The grading section is connected to the crushing section, and the second iron remover is connected to the discharge end of the grading section. The grading section is used to screen the powder and transport the powder with a particle size less than or equal to the first size to the second iron remover.

[0012] Furthermore, the iron removal device also includes a screening mechanism, which is arranged between the air flow crusher and the second iron remover. The screening mechanism is used to screen the powder and transport the powder with a particle size greater than or equal to the second size to the second iron remover.

[0013] Furthermore, the screening mechanism includes a sifter and an induced draft fan. The sifter is arranged between the air flow crusher and the second iron remover. The sifter is used to screen the powder and transport the powder with a particle size greater than or equal to the second size to the second iron remover. The induced draft fan is arranged downstream of the sifter to guide the powder to perform screening operations in the sifter and extract the powder with a particle size smaller than the second size.

[0014] Furthermore, the screener is a pulse dust collector.

[0015] Furthermore, the first iron remover and the second iron remover are both electromagnetic iron removers.

[0016] Furthermore, the iron removal device also includes a feed valve, which is arranged at the discharge end of the silo.

[0017] Furthermore, the iron removal device also includes a frame, and the first iron remover, the silo, the air flow crusher and the second iron remover are all arranged on the frame.

[0018] An electrode material preparation system comprises the iron removal device as described above.

[0019] The above-mentioned iron removal device first removes the particles through a first iron remover for preliminary iron removal, then uses a jet mill to crush the particles into a powder, and then uses a second iron remover to remove the powder for a second time. This effectively removes metallic impurities from the electrode material, preventing them from affecting battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application.

[0021] Figure 1 This is a schematic structural diagram of an iron removal device provided in one embodiment of the present application.

[0022] Description of labels:

[0023] 110. Silo; 120. Airflow mill; 121. Crushing section; 122. Classifying section; 130. Second iron remover; 140. Frame; 150. Feed valve; 161. Screener; 162. Induced draft fan. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0025] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0026] On the one hand, the present application provides an iron removal device that can perform iron removal operations during the preparation of electrode materials to remove ferromagnetic metal impurities in the electrode materials, thereby preventing the metal impurities from affecting battery performance.

[0027] like Figure 1 As shown, the iron removal device includes a first iron remover, a hopper 110 , a jet mill 120 and a second iron remover 130 .

[0028] The first iron remover is used to remove iron from the particulate matter. A silo 110 is located downstream of the first iron remover and is used to receive and store the iron-removed particulate matter. A jet mill 120 is connected to the discharge end of the silo 110 and is used to crush the particulate matter to produce a powder. A second iron remover 130 is located downstream of the jet mill 120 and is used to remove iron from the powder.

[0029] It can be understood that the particles and powders in this embodiment are both electrode materials.

[0030] Using the above-mentioned iron removal device, the first iron remover performs preliminary iron removal on the particulate matter, then the air flow mill 120 pulverizes the particulate matter into a powder, and then the second iron remover 130 performs a secondary iron removal on the powder. This effectively removes metallic impurities from the electrode material, preventing them from affecting battery performance.

[0031] Optionally, both the first iron remover and the second iron remover 130 are electromagnetic iron removers, wherein the magnetic force of the second iron remover 130 reaches 21,000 gauss.

[0032] In one embodiment, the iron removal device further includes a frame 140, and the first iron remover, the silo 110, the air flow mill 120 and the second iron remover 130 are all arranged on the frame 140. Figure 1 In the illustrated embodiment, the first iron remover may be disposed above the silo 110 to discharge the iron-removed particulate matter directly into the silo 110 .

[0033] Furthermore, the iron removal device further includes a feed valve 150 , which is disposed at the discharge end of the silo 110 to control the discharge of the silo 110 .

[0034] In one embodiment, the iron removal device further includes a granulator, which is arranged upstream of the first iron removal machine and is used to granulate the raw material to generate the above-mentioned particulate matter. It should be noted that the particle size of the raw material is not uniform, and there may be fine powdered materials or block materials with larger particle sizes. In order to facilitate the transportation of the raw material and prevent the raw material from being more adhered to the side wall of the equipment during transportation, a granulator is provided to prepare the raw material into particulate matter. Among them, the particle size of the particulate matter prepared by the granulator is 2-5 cm.

[0035] In addition, it can be understood that in this embodiment, the particulate matter generated by the granulator can be transported to the first iron remover through a conveyor belt, or the particulate matter can be blown into or sucked into the first iron remover through a pipeline in conjunction with a fan or a vacuum loader. At this time, there is no need to set the granulator above the first iron remover to control the overall height of the iron removal device.

[0036] In one embodiment, the air flow mill 120 includes a crushing section 121 and a grading section 122. The crushing section 121 is connected to the discharge end of the hopper 110 and is used to crush the particulate matter to generate powder. The grading section 122 is connected to the crushing section 121, and the second iron remover 130 is connected to the discharge end of the grading section 122. The grading section 122 is used to screen the powder and convey the powder with a particle size less than or equal to the first size to the second iron remover 130.

[0037] The first size is 5 μm. The grading unit 122 can perform preliminary screening on the material, and convey the powder with a particle size less than or equal to 5 μm to the second iron remover 130, while the powder with a particle size greater than 5 μm is conveyed back to the crushing unit 121 for further crushing.

[0038] In one embodiment, the iron removal device further includes a screening mechanism, which is disposed between the air flow mill 120 and the second iron remover 130 . The screening mechanism is used to screen the powder and transport the powder with a particle size greater than or equal to the second size to the second iron remover 130 .

[0039] The second size is 3 μm. Based on the above embodiment, the particle size of the powder delivered to the second iron remover 130 is 3-5 μm. Powders with a particle size less than 3 μm can be recovered using other mechanisms and then delivered back to the granulator to save resources.

[0040] Furthermore, the screening mechanism includes a sifter 161 and an induced draft fan 162. The sifter 161 is arranged between the air flow crusher 120 and the second iron remover 130. The sifter 161 is used to screen the powder and transport the powder with a particle size greater than or equal to the second size to the second iron remover 130; the induced draft fan 162 is arranged downstream of the sifter 161, used to guide the powder to perform screening operations in the sifter 161, and to extract the powder with a particle size smaller than the second size.

[0041] Optionally, the sifter 161 is a pulse dust collector. Furthermore, in order to recycle powder with a particle size smaller than the second size, a pulse dust collector capable of recycle even smaller particles can be provided between the sifter 161 and the induced draft fan 162. In other words, the powder will sequentially pass through the two pulse dust collectors under the action of the induced draft fan 162, and the second pulse dust collector can recycle powder with a particle size smaller than the second size.

[0042] In order to facilitate understanding of the technical solution of this application, Figure 1 The process flow of the iron removal device in the above embodiment is described as follows:

[0043] First, the raw materials are added to the granulator, where they are processed into pellets with a particle size of 2-5 cm. The pellets are then initially deironed by the first deironing machine. The deironed pellets are then transported to silo 110. A control valve is opened, and the pellets in silo 110 are transported to airflow mill 120 for pulverization. Powders with a particle size of 5 μm or less enter sifter 161. After sieving in sifter 161, powders with a particle size of 3 μm or greater enter second deironing machine 130 for secondary deironing, resulting in a powdered electrode material.

[0044] On the other hand, the present application also provides an electrode material preparation system, which includes the iron removal device in the above embodiment.

[0045] In summary, the iron removal device and electrode material preparation system provided by this application have at least the following advantages:

[0046] 1. After two iron removal operations, the material can effectively remove ferromagnetic metal impurities in the electrode material, thereby preventing metal impurities from affecting battery performance;

[0047] 2. The air flow mill can perform preliminary screening of the material, conveying powder with a particle size of less than or equal to 5 μm to the second iron remover 130, while powder with a particle size greater than 5 μm is conveyed back to the crushing unit 121 for further crushing. By classifying the particles, the iron removal efficiency can be improved and sufficient iron removal can be achieved;

[0048] 3. The powder after passing through the sifter 161 can also be recycled and then transported back to the granulator to save resources and reduce costs.

[0049] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An iron removal device, characterized in that: include: A first iron remover is used to remove iron from particulate matter; a silo, disposed downstream of the first iron remover, for receiving and storing the iron-removed particulate matter; an air flow pulverizer connected to the discharge end of the silo, for pulverizing the particulate matter to generate powder; The second iron remover is arranged downstream of the air flow mill and is used for removing iron from the powder.

2. The iron removal device according to claim 1, characterized in that The iron removal device further includes a granulator, which is arranged upstream of the first iron remover and is used to granulate the raw material to generate the particulate matter.

3. The iron removal device according to claim 1, characterized in that: The air flow mill includes a crushing part and a grading part. The crushing part is connected to the discharge end of the hopper and is used to crush the particulate matter to generate the powder. The grading part is connected to the crushing part. The second iron remover is connected to the discharge end of the grading part. The grading part is used to screen the powder and transport the powder with a particle size less than or equal to the first size to the second iron remover.

4. The iron removal device according to claim 1, characterized in that The iron removal device also includes a screening mechanism, which is arranged between the air flow crusher and the second iron remover. The screening mechanism is used to screen the powder and transport the powder with a particle size greater than or equal to the second size to the second iron remover.

5. The iron removal device according to claim 4, characterized in that: The screening mechanism includes a sifter and an induced draft fan. The sifter is arranged between the air flow crusher and the second iron remover. The sifter is used to screen the powder and transport the powder with a particle size greater than or equal to the second size to the second iron remover. The induced draft fan is arranged downstream of the sifter to guide the powder to perform a screening operation in the sifter and extract the powder with a particle size smaller than the second size.

6. The iron removal device according to claim 5, characterized in that: The screener is a pulse dust collector.

7. The iron removal device according to claim 1, characterized in that: The first iron remover and the second iron remover are both electromagnetic iron removers.

8. The iron removal device according to claim 1, characterized in that: The iron removal device further includes a feed valve, which is arranged at the discharge end of the silo.

9. The iron removal device according to claim 1, characterized in that: The iron removal device further includes a frame, and the first iron remover, the silo, the air flow crusher and the second iron remover are all arranged on the frame.

10. An electrode material preparation system, characterized in that: The invention comprises the iron removal device according to any one of claims 1 to 9.

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