Negative electrode material graphitization purification device

Abstract

According to the negative electrode material graphitization and purification device provided by the invention, the charging device is arranged on the graphitization furnace, so that materials are supplemented into the graphitization furnace in time, a plurality of electrodes are arranged in the furnace, and heat generated after the electrodes are electrified is used as a heat source to perform graphitization on raw materials; meanwhile, the material blocking device is arranged to discharge the graphitized raw materials in a controlled mode, the cooling bin is further arranged to cool the graphitized materials discharged from the hearth, the graphitized materials are discharged into the cooling bin to be cooled through cooperative use of the equipment, furnace shutdown for cooling is not needed, and therefore the production efficiency is improved. The purpose of continuously graphitizing the negative electrode material is achieved, and the defects that in a traditional intermittent graphitization mode, the graphitization process is difficult to continuously carry out, the production period is prolonged, and the production efficiency is low are overcome.

Description

Technical Field

[0001] The present application relates to the technical field of graphitization of materials, and in particular to a graphitization purification device for negative electrode materials. Background Art

[0002] Graphitization refers to the process of non-graphite carbon being treated at a temperature of more than 2000℃, which causes the hexagonal carbon atoms to develop a perfect and orderly three-dimensional structure due to physical changes, and then transform into graphite carbon with a regular three-dimensional structure. The current definition of the graphitization process is to heat the product to more than 2000℃ in a high-temperature electric furnace in a protective medium or in an airtight state, so that the amorphous chaotic layer structure carbon is transformed into a three-dimensional ordered graphite crystal.

[0003] The existing method of graphitizing materials is to heat non-graphite carbon such as petroleum coke, coal, asphalt coke, etc. to graphitization temperature in a graphite crucible by electric heating. However, this method of graphitizing materials is often difficult to carry out continuously. It is necessary to stop the furnace after the graphitization of the entire furnace material is completed, let the materials in the furnace cool naturally, and then take the graphitized material out of the crucible, which undoubtedly prolongs the production cycle and reduces production efficiency. Utility Model Content

[0004] The present application provides a graphitization purification device for negative electrode materials, which is used to solve the problem that the above-mentioned existing graphitization process is difficult to be carried out continuously, thereby prolonging the production cycle and reducing the production efficiency.

[0005] The present application provides a graphitization purification device for negative electrode materials, comprising a graphitization furnace, wherein the graphitization furnace is connected to a cooling chamber through a drop pipe at the bottom;

[0006] The top of the graphitization furnace is connected to the feeding device;

[0007] A plurality of electrodes are arranged in the graphitization furnace, and the electrodes are arranged vertically through the top of the graphitization furnace;

[0008] The graphitization furnace and the down pipe are separated by a material blocking device, and the material blocking device is movably connected to the graphitization furnace.

[0009] Optionally, the material blocking device includes a block; the lower surface of the block is fixedly connected to the connecting rod;

[0010] The connecting rod is connected to one end of a horizontally arranged operating rod, and the other end of the operating rod passes through the side wall of the drop tube and extends out of the drop tube;

[0011] The operating rod is rotatably connected to a pin shaft arranged on the drop tube.

[0012] Optionally, the feeding device includes a receiving bin, the lower part of which is connected to the crushing bin.

[0013] A pair of crushing rollers are arranged in the crushing chamber, and the crushing chamber is connected to the graphitization furnace through a connecting pipe;

[0014] The connecting pipe and the graphitization furnace are separated by a first gate plate.

[0015] Optionally, multiple layers of cooling tubes are provided in the cooling bin, and adjacent cooling tubes in the same layer are arranged at intervals;

[0016] A second gate is arranged at the bottom of the cooling chamber.

[0017] Optionally, an air inlet is provided on the lower side of the cooling bin;

[0018] The air inlet is connected to the protective gas storage tank through a pipeline;

[0019] At least one exhaust port is provided on the side of the drop pipe, and the exhaust port is connected to the dust removal device through a pipeline.

[0020] Optionally, the dust removal device is a cyclone dust collector, a bag dust collector or an electrostatic dust collector.

[0021] Optionally, the graphitization furnace is also connected to a tail gas treatment device.

[0022] The present application provides a graphitization purification device for negative electrode materials. A feeding device is arranged on the graphitization furnace to timely feed the graphitization furnace, and a plurality of electrodes are arranged in the furnace. The heat generated by the electrodes after being energized is used as a heat source to graphitize the raw materials. At the same time, a material blocking device is arranged to discharge the graphitized raw materials in a controlled manner. A cooling bin is also arranged to cool the graphitized materials discharged from the furnace. The device of the present application, through the coordinated use of the above-mentioned equipment, discharges the graphitized materials into the cooling bin for cooling without stopping the furnace for cooling, thereby achieving the purpose of continuously graphitizing the negative electrode materials and overcoming the disadvantages of the traditional intermittent graphitization method that the graphitization process is difficult to be carried out continuously, which prolongs the production cycle and leads to low production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the structure of a graphitization purification device for negative electrode materials provided in one embodiment of the present application;

[0025] Figure 2 A schematic diagram of a top view of a graphitization furnace for negative electrode materials provided in one embodiment of the present application;

[0026] Figure 3 A schematic diagram of the structure of a material blocking device provided in one embodiment of the present application;

[0027] Figure 4 A schematic diagram of the structure of a feeding device provided in one embodiment of the present application;

[0028] Figure 5 A schematic diagram of a top view of a cooling bin provided in one embodiment of the present application;

[0029] Figure 6 A schematic diagram of the structure of a graphitization purification device for negative electrode materials provided in another embodiment of the present application;

[0030] Figure 7 A schematic structural diagram of a negative electrode material graphitization purification device provided in yet another embodiment of the present application.

[0031] Description of reference numerals:

[0032] 1. Graphitization furnace; 2. Down pipe; 3. Cooling bin; 4. Feeding device; 5. Material blocking device; 6. Dust removal device; 11. Electrode; 12. Exhaust gas treatment device; 21. Pin shaft; 31. Cooling pipe; 32. Second gate; 33. Protective gas storage tank; 41. Receiving bin; 42. Crushing bin; 43. Connecting pipe; 44. First gate; 51. Block; 52. Connecting rod; 53. Operating lever; 201. Exhaust port; 301. Air inlet; 421. Crushing roller. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0034] like Figure 1 and Figure 2 As shown, the present application provides a graphitization purification device for negative electrode materials, comprising a graphitization furnace 1, wherein the graphitization furnace 1 is connected to a cooling chamber 3 through a drop pipe 2 at the bottom;

[0035] The top of the graphitization furnace 1 is connected to the feeding device 4;

[0036] A plurality of electrodes 11 are arranged in the graphitization furnace 1, and the electrodes 11 are arranged vertically through the top of the graphitization furnace 1;

[0037] The graphitization furnace 1 and the down pipe 2 are separated by a material blocking device 5 , and the material blocking device 5 is movably connected to the graphitization furnace 1 .

[0038] In the present application, the number of electrodes 11 can be set to multiple according to actual conditions. Figure 2 Three are shown in FIG.

[0039] When in use, the raw materials to be graphitized are added to the graphitization furnace 1 through the feeding device 4. When the raw materials are loaded to a certain height in the furnace (for example, the furnace is filled up), the feeding is stopped, and the electrode 11 is energized. When the current flows through the electrode 11, heat is generated due to the existence of resistance, thereby heating the raw materials around the electrode and heating it to the graphitization temperature (for example, 2000-2500°C). During the heating process, since the magnitude of the current changes during the heating process, in actual use, the magnitude of the voltage and current needs to be monitored in real time and adjusted in time to avoid unnecessary safety accidents.

[0040] After being heated and graphitized for a certain period of time, such as 20 to 30 minutes, the raw materials at the bottom of the furnace have been completely graphitized. At this time, the material blocking device 5 is opened to discharge the completely graphitized raw materials in the furnace from the bottom of the furnace through the down pipe 2 into the cooling bin 3. At the same time, the raw materials are added to the graphitization furnace 1 from the feeding device 4 to ensure that the raw material height in the furnace is in a dynamic full furnace state.

[0041] When a certain amount of material is discharged (a gravity sensor is installed on the bottom of the cooling bin 3 in the present application to control the amount of material discharged), the material stop device 5 is closed and reset, and the feeding device 4 is also stopped.

[0042] The temperature of the graphitized raw material falling from the bottom of the furnace is relatively high. When falling into the cooling bin 3, heat is exchanged with the cooling bin 3 to reduce the temperature. When the graphitized material in the cooling bin 3 is cooled to a suitable temperature (for example, 100-200°C), the bottom of the cooling bin 3 is opened, and the cooled graphitized material in the cooling bin 3 is discharged from the bottom of the cooling bin 3 and loaded into a corresponding container.

[0043] The present application provides a graphitization purification device for negative electrode materials. A feeding device 4 is arranged on the graphitization furnace 1 to timely feed the graphitization furnace 1, and a plurality of electrodes 11 are arranged in the furnace. The heat generated by the electrodes 11 after being energized is used as a heat source to graphitize the raw materials. At the same time, a material blocking device 5 is arranged to discharge the graphitized raw materials in a controlled manner. A cooling bin 3 is also arranged to cool the graphitized materials discharged from the furnace. The device of the present application, through the coordinated use of the above-mentioned equipment, discharges the graphitized materials into the cooling bin 3 for cooling without stopping the furnace for cooling, thereby achieving the purpose of continuously graphitizing the negative electrode materials and overcoming the disadvantages of the traditional intermittent graphitization method that the graphitization process is difficult to be carried out continuously, which prolongs the production cycle and leads to low production efficiency.

[0044] like Figure 3 As shown, optionally, the material blocking device 5 includes a block 51; the lower surface of the block 51 is fixedly connected to the connecting rod 52;

[0045] The connecting rod 52 is connected to one end of a horizontally arranged operating rod 53, and the other end of the operating rod 53 passes through the side wall of the drop tube 2 and extends out of the drop tube 2;

[0046] The operating rod 53 is rotatably connected to the pin shaft 21 provided on the drop tube 2 .

[0047] In the present application, when it is necessary to open the material blocking device 5 for unloading, the staff can press down the operating rod 53, and the operating rod 53 rotates around the pin 21 (the corresponding side wall of the drop tube 2 is provided with an opening for the operating rod 53 to move up and down when rotating around the pin 21, and the opening can be closed by a high temperature resistant flexible material to prevent the material dust from overflowing, and will not limit the up and down displacement of the operating rod 53), and the stopper 51 is pushed up by the joint action of the operating rod 53 and the connecting rod 52. At this time, the graphitized raw materials at the bottom of the furnace fall from the furnace bottom through the drop tube 2 to the cooling bin 3. The pin 21 can be fixed at both ends inside the drop tube 2 (perpendicular to the axis of the drop tube 2), or it can be set through the drop tube 2.

[0048] When the material unloading is completed and the material blocking device 5 needs to be reset, the operating rod 53 is lifted up to return the blocking block 51 to its original position.

[0049] like Figure 4 As shown, optionally, the feeding device 4 includes a receiving bin 41, and the lower part of the receiving bin 41 is connected to the crushing bin 42.

[0050] A crushing pair of rollers 421 is provided in the crushing chamber 42, and the crushing chamber 42 is connected to the graphitization furnace 1 through a connecting pipe 43;

[0051] The connecting pipe 43 and the graphitization furnace 1 are separated by a first gate plate 44 .

[0052] In the present application, when in use, the first gate 44 is opened, and the raw materials to be graphitized are added to the receiving bin 41 of the feeding device 4, and the raw materials fall from the receiving bin 41 into the crushing bin 42, and the raw materials larger than the preset particle size are sheared, squeezed, etc. by the crushing rollers 421 to be crushed into a suitable size. The crushed raw materials enter the graphitization furnace 1 from the connecting pipe 43, and when the raw materials are filled to a certain height in the furnace (for example, the furnace is filled), the first gate 44 is closed.

[0053] like Figure 1 , Figure 5 and Figure 6 As shown, optionally, multiple layers of cooling tubes 31 are provided in the cooling bin 3, and adjacent cooling tubes 31 in the same layer are arranged at intervals;

[0054] A second gate plate 32 is provided at the bottom of the cooling chamber 3 .

[0055] In the present application, circulating cooling water is passed through the cooling pipe 31, and heat is exchanged with the falling high-temperature material in the cooling bin 3 to reduce its temperature. When the temperature of the material is reduced to a suitable temperature (for example, 100-200°C), the second gate 32 is opened to discharge the cooled material from the bottom of the cooling bin 3. In order to control the amount of material discharged each time to be uniform and controllable, a gravity sensor can be installed on the second gate 32 to determine the amount of material discharged by monitoring the gravity change value.

[0056] like Figure 6 As shown, optionally, an air inlet 301 is provided on the lower side of the cooling bin 3;

[0057] The air inlet 301 is connected to the protective gas storage tank 33 through a pipeline;

[0058] At least one exhaust port 201 is provided on the side of the drop pipe 2 , and the exhaust port 201 is connected to the dust removal device 6 through a pipeline.

[0059] In the present application, since the temperature of the graphitized material just out of the furnace is relatively high, it is easily oxidized into carbon monoxide, carbon dioxide and other substances when in contact with the air, causing a portion of the material to be lost, resulting in a decrease in production. The introduction of protective gas (nitrogen or argon in the present application) into the cooling bin 3 can effectively prevent the high-temperature material on the way out from being oxidized and causing losses. In addition, since the protective gas enters the cooling bin 3 and the drop tube 2 from bottom to top, the temperature of the protective gas will decrease when the protective gas passes through the cooling tube 31, and when the protective gas contacts the high-temperature material, it can also play a role in further reducing the temperature of the material.

[0060] The exhaust port 201 opened on the drop pipe 2 can discharge the blown-in protective gas. Since the discharged protective gas will contain some dust, the discharged gas is introduced into the dust removal device 6, and after the dust is intercepted, the clean gas is discharged. The dust intercepted by the dust removal device 6 is collected for recycling.

[0061] Optionally, the dust removal device 6 is a cyclone dust collector, a bag dust collector or an electrostatic dust collector.

[0062] like Figure 7 As shown, optionally, the graphitization furnace 1 is also connected to the tail gas treatment device 12 .

[0063] In the present application, during the graphitization process, the volatiles in the raw materials will evaporate in a gaseous state after being heated. The gas formed by these volatiles may contain recyclable substances such as aromatic organic matter, which can be recycled and utilized as resources to reduce waste.

[0064] A graphitized material purification device, the working process of which is as follows:

[0065] When in use, open the first gate 44, add the raw material to be graphitized into the receiving bin 41 of the feeding device 4, and the raw material falls from the receiving bin 41 into the crushing bin 42. The raw material larger than the preset particle size is sheared, squeezed, etc. by the crushing roller 421 and crushed into a suitable size. The crushed raw material enters the graphitization furnace 1 from the connecting pipe 43. When the raw material is filled to a certain height in the furnace (for example, the furnace is filled), the first gate 44 is closed at this time, and the electrode 11 is energized. When the current flows through the electrode 11, heat is generated due to the existence of resistance, thereby heating the raw material around the electrode and heating it to the graphitization temperature (for example, 2000-2500°C). During the heating process, the current will change during the heating process. Therefore, in actual use, the voltage and current need to be monitored in real time and adjusted in time to avoid unnecessary safety accidents.

[0066] After a certain period of heating and graphitization, such as 20 to 30 minutes, the raw materials at the bottom of the furnace have been completely graphitized. At this time, the protective gas (such as nitrogen, argon and other inert gases) in the protective gas storage tank 33 is introduced into the cooling bin 3 from the air inlet 301 below the cooling bin 3 from bottom to top. The protective gas is introduced for a period of time, such as 10 to 15 minutes or after the dust removal device 6 has gas discharged, wait for 3 to 5 minutes to ensure that the protective gas can fill the cooling bin 3 and the drop pipe 2. Then the staff can press down the operating rod 53 to lift the block 51 upward through the joint action of the operating rod 53 and the connecting rod 52. At this time, the graphitized raw materials at the bottom of the furnace fall from the bottom of the furnace through the drop pipe 2 to the cooling bin 3. At the same time, the raw materials are added to the graphitization furnace 1 from the feeding device 4 to ensure that the height of the raw materials in the furnace is in a dynamic full furnace state.

[0067] When a certain amount of material is unloaded (in this application, a gravity sensor is installed on the second gate plate 32 to control the amount of unloading), the operating rod 53 is lifted up to return the stopper 51 to its position, and the feeding device 4 is also stopped. The temperature of the graphitized raw material falling from the bottom of the furnace is relatively high. When it falls into the cooling bin 3, it exchanges heat with the cooling pipe 31 in the cooling bin 3 to reduce the temperature; at the same time, when the high-temperature graphitized material contacts the protective gas introduced from bottom to top (the protective gas will reduce its own temperature through the cooling pipe 31 from bottom to top), the temperature of the graphitized material will be further reduced. When the graphitized material in the cooling bin 3 is cooled to a suitable temperature (for example, 100 to 200°C), the introduction of the protective gas is stopped, and the second gate plate 32 is opened again to discharge the cooled graphitized material in the cooling bin 3 from the bottom of the cooling bin 3 and load it into the corresponding container. After the graphitized material dust blown out by the protective gas is separated by the dust collector, the graphitized material is collected and combined with the graphitized material in the cooling chamber 3 and loaded into a corresponding container.

[0068] During the graphitization process, the volatiles in the raw materials will be volatilized in gaseous form after being heated, and these gaseous volatiles are introduced into the corresponding tail gas treatment device 12 for resource recovery and harmless treatment.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A graphitization purification device for negative electrode materials, characterized in that: It comprises a graphitization furnace (1), wherein the graphitization furnace (1) is connected to a cooling chamber (3) via a down pipe (2) at the bottom; The top of the graphitization furnace (1) is connected to a feeding device (4); A plurality of electrodes (11) are arranged in the graphitization furnace (1), and the electrodes (11) are vertically arranged through the top of the graphitization furnace (1); The graphitization furnace (1) and the down pipe (2) are separated by a material blocking device (5), and the material blocking device (5) is movably connected to the graphitization furnace (1).

2. The graphitization purification device for negative electrode materials according to claim 1, characterized in that: The material blocking device (5) comprises a blocking block (51); the lower surface of the blocking block (51) is fixedly connected to a connecting rod (52); The connecting rod (52) is connected to one end of a horizontally arranged operating rod (53), and the other end of the operating rod (53) passes through the side wall of the drop tube (2) and extends out of the drop tube (2); The operating rod (53) is rotatably connected to a pin shaft (21) arranged on the drop tube (2).

3. The graphitization purification device for negative electrode materials according to claim 1, characterized in that: The feeding device (4) comprises a receiving bin (41), the lower part of which is connected to a crushing bin (42). A pair of crushing rollers (421) are arranged in the crushing chamber (42), and the crushing chamber (42) is connected to the graphitization furnace (1) via a connecting pipe (43); The connecting pipe (43) is separated from the graphitization furnace (1) by a first gate plate (44).

4. The graphitization purification device for negative electrode materials according to claim 1, characterized in that: The cooling bin (3) is provided with multiple layers of cooling pipes (31), and adjacent cooling pipes (31) in the same layer are arranged at intervals; A second gate plate (32) is provided at the bottom of the cooling bin (3).

5. The graphitization purification device for negative electrode materials according to claim 1, characterized in that: An air inlet (301) is provided on the lower side of the cooling bin (3); The air inlet (301) is connected to the protective gas storage tank (33) through a pipeline; At least one exhaust port (201) is provided on the side of the drop pipe (2), and the exhaust port (201) is connected to the dust removal device (6) through a pipeline.

6. The graphitization purification device for negative electrode materials according to claim 5, characterized in that: The dust removal device (6) is a cyclone dust collector, a bag dust collector or an electrostatic dust collector.

7. The graphitization purification device for negative electrode materials according to any one of claims 1 to 6, characterized in that: The graphitization furnace (1) is also connected to a tail gas treatment device (12).

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