Graphite negative electrode material carbonization, graphitization and crucible calcination integrated device and method

Abstract

The application discloses a graphite negative electrode material carbonization, graphitization and crucible roasting integrated device and method. The device comprises a furnace body, a carbonization mechanism and a pushing mechanism. The furnace body comprises an insulation layer, a heating layer and a first plugging block. The carbonization mechanism comprises a hopper and a discharge valve. The pushing mechanism is used for pushing the crucible in the containing cavity into the heating cavity. The graphite negative electrode material carbonization, graphitization and crucible roasting integrated device has the beneficial effects that the containing cavity is arranged in the insulation layer, the temperature of the containing cavity is lower than that of the heating cavity, the graphitization process can be carried out in the heating cavity, the graphite negative electrode material carbonization and the crucible roasting process can be carried out in the containing cavity, different objects with different target temperatures can be heated in different partial regions of the furnace body, the crucible in the containing cavity is pushed into the heating cavity by the pushing mechanism, the carbonized graphite negative electrode material and the heated crucible in the containing cavity do not need to be taken out and directly pushed into the heating cavity, heat waste can be reduced, and environmental protection benefits can be improved.

Description

Technical Field

[0001] This invention relates to the field of graphitization technology for graphite anode materials, specifically to an integrated apparatus and method for carbonization, graphitization, and crucible calcination of graphite anode materials. Background Technology

[0002] Carbonization and graphitization of graphite anode materials are important steps in the preparation of lithium-ion battery anode materials, each with different purposes and process characteristics.

[0003] Carbonization refers to calcining the negative electrode material in a high-temperature environment, causing the non-carbon elements to evaporate or dissolve, thereby increasing the carbon content of the material and improving its conductivity. The carbonization process is generally carried out in the range of 700–1000℃ and is a pretreatment step before graphitization. During the carbonization process, a carbonization furnace is required to carbonize the negative electrode material.

[0004] Graphitization refers to the process of heating carbonized carbonaceous materials to 2300–3000℃, transforming their amorphous, disordered layered structure into an ordered graphite crystalline structure. Graphitization is a core process in the preparation of artificial graphite anodes, playing a decisive role in the product's quality and stability. A graphitization furnace is required during the graphitization process.

[0005] Meanwhile, in the graphitization furnace, carbonaceous material is typically loaded into a crucible, which is then placed inside the furnace. During crucible production, the crucible blank needs to be heated and solidified in a furnace; therefore, a heating furnace is also required to heat the crucible blank.

[0006] Therefore, during the operation of the graphitization system, it is necessary to separately carbonize the negative electrode material in a carbonization furnace, graphitize the carbonized carbon material in a graphitization furnace, and heat and solidify the crucible blank in a heating furnace to obtain the crucible. This not only increases the equipment purchase cost, but also means that the material will inevitably cool down after being removed from the carbonization furnace and needs to be reheated after being put back into the graphitization furnace. Similarly, the crucible will cool down after being taken out of the heating furnace and needs to be reheated after being put back into the graphitization furnace, which will lead to a large waste of heat and reduce energy utilization efficiency. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned technical deficiencies and to propose an integrated device and method for carbonization, graphitization and crucible calcination of graphite anode materials, thereby solving the technical problems of increased equipment costs and heat waste caused by the separate carbonization, graphitization and crucible calcination of graphite anode materials in the prior art.

[0008] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0009] This invention provides an integrated apparatus and method for carbonization, graphitization, and crucible calcination of graphite anode materials, comprising:

[0010] The furnace body includes an insulation layer, a heating layer, and a first sealing block. The insulation layer has a heating cavity at its center and a receiving cavity is formed inside the insulation layer. The receiving cavity is used to place a crucible blank. The receiving cavity is connected to the heating cavity through a first through hole and to the outside of the furnace body through a second through hole. The heating layer is disposed inside the heating cavity, and the first sealing block is used to plug the second through hole.

[0011] A carbonization mechanism, comprising a funnel and a discharge valve, wherein the funnel is used to load graphite anode raw materials, one end of the discharge valve is connected to the outlet of the funnel, and the other end of the discharge valve is connected to the inlet of the crucible blank; and,

[0012] A pushing mechanism is used to push the crucible in the receiving cavity into the heating cavity.

[0013] In some embodiments, the insulation layer is further provided with a third through hole, which communicates with the heating cavity. The furnace body also includes a second sealing block, which is used to plug the third through hole.

[0014] In some embodiments, the heating layer is a resistive material layer.

[0015] In some embodiments, the insulation layer is further provided with a feed hole, the lower end of which is located directly above the feed inlet of the funnel.

[0016] In some embodiments, the furnace body further includes a stopper rod for inserting into the feed hole.

[0017] In some embodiments, a receiving groove is formed on the inner wall of the first through hole; the integrated device for carbonization, graphitization and crucible calcination of graphite negative electrode material further includes a sealing mechanism, the sealing mechanism includes a sealing block and a lifting drive, the sealing block is movably disposed in the first through hole, the lifting drive is connected to the sealing block and is used to drive the sealing block to move up and down, so that the sealing block is located in the first through hole or in the receiving groove.

[0018] In some embodiments, the outer wall of the insulation layer is provided with an insertion hole that communicates with the receiving groove;

[0019] The lifting drive component includes a lifting drive cylinder and a lifting rod. The cylinder body of the lifting drive cylinder is fixed outside the insulation layer. The output shaft of the lifting drive cylinder is fixedly connected to one end of the lifting rod. The other end of the lifting rod passes through the insertion hole and is fixedly connected to the sealing block.

[0020] In some embodiments, a guide hole is provided on the first sealing block, and the pushing mechanism includes a pushing cylinder, a push rod and a push plate. The cylinder body of the pushing cylinder is fixed to the first sealing block, the output shaft of the pushing cylinder is fixedly connected to one end of the push rod, and the other end of the push rod passes through the guide hole and is fixedly connected to the push plate. The push plate is used to push the crucible.

[0021] In some embodiments, a first handle is formed on the first sealing block.

[0022] This invention also provides an integrated method for carbonization, graphitization, and crucible calcination of graphite anode materials, applicable to the aforementioned integrated apparatus for carbonization, graphitization, and crucible calcination of graphite anode materials, and comprising the following steps:

[0023] S1. Place the crucible blank into the receiving cavity, load the graphite anode material into the funnel, energize the heating layer, heat the heating cavity, raise the temperature inside the receiving cavity, carbonize the graphite anode material, and heat the crucible blank at the same time.

[0024] S2. After heating for a period of time, the crucible blank is transformed into a crucible. The discharge valve is opened, and the carbonized graphite anode material in the funnel enters the crucible.

[0025] S3. The crucible in the receiving cavity is pushed into the heating cavity by the pushing mechanism, a new crucible blank is placed into the receiving cavity, a new graphite anode material is loaded into the funnel, the heating layer is energized, the heating layer heats the heating cavity, the graphite anode material in the crucible in the heating cavity is graphitized, and at the same time, the temperature in the receiving cavity rises, the new graphite anode material is carbonized, and the crucible blank is heated.

[0026] S4. After heating for a period of time, the graphite anode material in the crucible in the heating chamber is graphitized. The crucible in the heating chamber is removed. At the same time, the crucible blank in the receiving chamber is transformed into a crucible. The discharge valve is opened, and the carbonized graphite anode raw material in the funnel enters the crucible.

[0027] S5. Repeat steps S3-S4 until the process is completed.

[0028] Compared with existing technologies, the beneficial effects of the integrated apparatus and method for carbonization, graphitization, and crucible calcination of graphite anode materials provided by this invention are as follows: By opening a receiving cavity within the insulation layer, the temperature of the receiving cavity is lower than that of the heating cavity. This allows the graphitization process to be carried out in the heating cavity, while the carbonization of the graphite anode material and the crucible calcination process can be carried out in the receiving cavity. This enables heating of objects at different target temperatures in a single furnace body within a partial area. Simultaneously, the carbonized graphite anode material is automatically controlled to enter the calcined crucible via a discharge valve. A pushing mechanism pushes the crucible from the receiving cavity into the heating cavity. This allows the carbonized graphite anode material and the heated crucible in the receiving cavity to be directly pushed into the heating cavity without being removed, avoiding cooling of the graphite anode material and crucible, reducing heat waste, and improving environmental benefits. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the integrated apparatus for carbonization, graphitization, and crucible calcination of graphite anode materials according to an embodiment of the present invention.

[0030] Figure 2 yes Figure 1 A magnified view of a portion of region A in the middle;

[0031] Figure 3 yes Figure 1 A schematic diagram of the process of removing the crucible from the integrated device for carbonization, graphitization and crucible calcination of graphite anode material;

[0032] Figure 4 yes Figure 3 A schematic diagram of the process of carbonized graphite anode material entering the crucible in the integrated device for carbonization, graphitization and crucible calcination of graphite anode material.

[0033] Figure 5 yes Figure 4 A schematic diagram of the process of pushing the crucible into the heating chamber in the integrated device for carbonization, graphitization and crucible calcination of graphite anode material.

[0034] Figure 6 yes Figure 5 A schematic diagram of the process of loading new crucible blanks into the receiving cavity in an integrated device for carbonization, graphitization and crucible calcination of graphite anode materials.

[0035] Explanation of reference numerals in the attached drawings: 1-furnace body, 11-insulation layer, 111-heating chamber, 112-accommodating chamber, 113-first through hole, 114-second through hole, 1141-first limiting block, 115-third through hole, 1151-second limiting block, 116-accommodating groove, 12-heating layer, 14-first sealing block, 131-first handle, 13-second sealing block, 141-second handle, 15-stopper rod, 2-carbonization mechanism, 21-funnel, 22-discharge valve, 3-pushing mechanism, 31-pushing cylinder, 32-push rod, 33-push plate, 4-crucible blank, 41-crucible, 5-sealing mechanism, 51-sealing block, 52-lifting drive component, 521-lifting drive cylinder, 522-lifting rod. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] To address the technical problem of increased equipment costs and heat waste caused by separately performing carbonization, graphitization, and crucible calcination of graphite anode materials, this invention provides an integrated device and method for carbonization, graphitization, and crucible calcination of graphite anode materials, which can achieve integrated carbonization, graphitization, and crucible calcination of graphite anode materials.

[0038] Please see Figure 1 , Figure 1 This is a schematic diagram of the integrated apparatus and method for carbonization, graphitization, and crucible calcination of graphite anode material in one embodiment of the present invention. The integrated apparatus and method for carbonization, graphitization, and crucible calcination of graphite anode material includes a furnace body 1, a carbonization mechanism 2, and a pushing mechanism 3.

[0039] Please see Figure 1 and Figure 2 The furnace body 1 includes a heat insulation layer 11, a heating layer 12, and a first sealing block 14. The heat insulation layer 11 has a heating cavity 111 at its center, and a receiving cavity 112 is formed within the heat insulation layer 11. The receiving cavity 112 is used to hold the crucible blank 4. The receiving cavity 112 communicates with the heating cavity 111 via a first through hole 113 and with the outside of the furnace body via a second through hole 114. The heating layer 12 is disposed within the heating cavity 111. The first sealing block 14 is used to plug into the second through hole 114. In this embodiment, a first handle 131 is formed on the first sealing block 14 to facilitate pushing and pulling the first sealing block 14. A first limiting block 1141 is fixed to the inner edge of the second through hole 114, and the first limiting block 1141 is used to block and limit the first sealing block 14.

[0040] The carbonization mechanism 2 includes a funnel 21 and a discharge valve 22. The funnel 21 is used to load graphite negative electrode raw materials. One end of the discharge valve 22 is connected to the outlet of the funnel 21, and the other end of the discharge valve 22 is connected to the inlet of the crucible blank 4.

[0041] The pushing mechanism 3 is used to push the crucible 41 in the heating chamber 111 into the heating chamber 111.

[0042] In use, the crucible blank 4 is placed into the receiving cavity 112, and the graphite anode material is loaded into the funnel 21. The heating layer 12 is energized, heating the heating cavity 111, and the temperature inside the receiving cavity 112 also rises, carbonizing the graphite anode material while simultaneously heating the crucible blank 4. After heating for a period of time, the crucible blank 4 transforms into a crucible 41. The discharge valve 22 is opened, and the carbonized graphite anode material in the funnel 21 enters the crucible 41. The pushing mechanism 3 pushes the crucible 41 from the receiving cavity 112 into the heating cavity 111, allowing a new crucible blank 4 to be placed into the receiving cavity 112, and new graphite anode material to be loaded. The material is fed into the funnel 21, and the heating layer 12 is energized. The heating layer 12 heats the heating chamber 111, causing the graphite anode material in the crucible 41 within the heating chamber 111 to graphitize. At the same time, the temperature in the receiving chamber 112 rises, carbonizing the new graphite anode material and heating the new crucible blank 4. After heating for a period of time, the graphite anode material in the crucible 41 within the heating chamber 111 is graphitized. The crucible is then removed from the heating chamber 111, and the crucible blank 4 in the receiving chamber 112 is transformed into the crucible 41. The discharge valve 22 is opened, and the carbonized graphite anode material in the funnel 21 enters the crucible 41. The above steps are repeated until the process is completed.

[0043] The technical solution provided by this invention involves creating a receiving cavity 112 within the insulation layer 11. The temperature of the receiving cavity 112 is lower than that of the heating cavity 111. This allows the graphitization process to be performed in the heating cavity 111, while the carbonization of the graphite anode material and the crucible calcination process can be performed in the receiving cavity 112. This enables heating objects at different target temperatures in a single furnace within a specific area. Simultaneously, the carbonized graphite anode material is automatically controlled by the discharge valve 22 to enter the calcined crucible 41. The pushing mechanism 3 pushes the crucible 41 from the receiving cavity 112 into the heating cavity 111. This allows the carbonized graphite anode material and the heated crucible 41 in the receiving cavity 112 to be directly pushed into the heating cavity 111 without needing to be removed, thus avoiding cooling of the graphite anode material and the crucible 41, reducing heat waste, and improving environmental benefits.

[0044] In one embodiment, please refer to Figure 1 and Figure 3The insulation layer 11 also has a third through hole 115, which communicates with the heating chamber 111. The furnace body 1 also includes a second sealing block 13, which is used to plug into the third through hole 115. In this embodiment, a second handle 141 is formed on the second sealing block 13. A second limiting block 1151 is fixed to the lower edge of the third through hole 115, which is used to block and limit the second sealing block 13. In use, when it is necessary to remove the graphitized material, the second sealing block 13 can be lifted to open the third through hole 115, and then the crucible 41 in the heating chamber 111 can be lifted out using a gripper.

[0045] In one embodiment, please refer to Figure 1 The heating layer 12 is a resistive material layer.

[0046] In one embodiment, please refer to Figure 1 and Figure 2 The insulation layer 11 is also provided with a feeding hole. The lower end of the feeding hole is located directly above the feeding port of the funnel 21. The furnace body 1 also includes a stopper rod 15, which is used to plug into the feeding hole. When it is necessary to load graphite negative electrode material into the funnel 21, the stopper rod 15 is pulled out and then the graphite negative electrode material is loaded into the funnel 21 through the feeding hole.

[0047] In one embodiment, please refer to Figure 1 A receiving groove 116 is formed on the inner wall of the first through hole 113; the integrated device for carbonization, graphitization and crucible calcination of graphite negative electrode material also includes a sealing mechanism 5, which includes a sealing block 51 and a lifting drive 52. The sealing block 51 is movably disposed in the first through hole 113, and the lifting drive 52 is connected to the sealing block 51 and is used to drive the sealing block 51 to move up and down, so that the sealing block 51 is located in the first through hole 113 or in the receiving groove 116. When heated, the sealing block 51 is located in the first through hole 113, thereby separating the heating chamber 111 and the receiving chamber 112, so that the heating chamber 111 and the receiving chamber 112 have a set temperature difference to ensure the different temperatures required for different processes. When it is necessary to push the crucible 41 in the receiving chamber 112 into the heating chamber 111, the sealing block 51 can be pulled into the receiving groove 116 by the lifting drive 52, so that the first through hole 113 is opened, thereby facilitating the crucible 41 in the receiving chamber 112 to enter the heating chamber 111 through the first through hole 113.

[0048] In one embodiment, please refer to Figure 1The outer wall of the insulation layer 11 is provided with an insertion hole that communicates with the receiving groove 116; the lifting drive component 52 includes a lifting drive cylinder 521 and a lifting rod 522. The cylinder body of the lifting drive cylinder 521 is fixed to the outside of the insulation layer 11. The output shaft of the lifting drive cylinder 521 is fixedly connected to one end of the lifting rod 522. The other end of the lifting rod 522 passes through the insertion hole and is fixedly connected to the sealing block 51.

[0049] In one embodiment, please refer to Figure 1 The first sealing block 14 has a guide hole. The pushing mechanism 3 includes a pushing cylinder 31, a push rod 32, and a push plate 33. The cylinder body of the pushing cylinder 31 is fixed to the first sealing block 14. The output shaft of the pushing cylinder 31 is fixedly connected to one end of the push rod 32. The other end of the push rod 32 passes through the guide hole and is fixedly connected to the push plate 33. The push plate 33 is used to push the crucible 41. In use, the pushing cylinder 31 drives the push plate 33 to move, thereby pushing the crucible 41 in the receiving cavity 112 into the heating cavity 111.

[0050] This invention also provides an integrated method for carbonization, graphitization, and crucible calcination of graphite anode materials, applicable to the aforementioned integrated apparatus for carbonization, graphitization, and crucible calcination of graphite anode materials, and comprising the following steps:

[0051] S1. Place the crucible blank 4 into the receiving cavity 112, load the graphite anode material into the funnel 21, energize the heating layer 12, heat the heating cavity 111 by the heating layer 12, and the temperature in the receiving cavity 112 also rises, carbonizing the graphite anode material, while simultaneously heating the crucible blank 4.

[0052] S2. After heating for a period of time, the crucible blank 4 is transformed into crucible 41. The discharge valve 22 is opened, and the carbonized graphite anode material in the funnel 21 enters the crucible 41 (e.g., Figure 4 );

[0053] S3, The pushing mechanism 3 is used to push the crucible 41 in the receiving cavity 112 into the heating cavity 111 (e.g., Figure 5 ), and place the new crucible blank 4 into the receiving cavity 112 (e.g. Figure 6 The new graphite anode material is loaded into funnel 21 (e.g., Figure 6 When the heating layer 12 is energized, the heating layer 12 heats the heating cavity 111, causing the graphite negative electrode material in the crucible 41 inside the heating cavity 111 to graphitize. At the same time, the temperature inside the receiving cavity 112 rises, carbonizing the new graphite negative electrode raw material and heating the new crucible blank 4.

[0054] S4. After heating for a period of time, the graphitized negative electrode material in the crucible 41 inside the heating chamber 111 is graphitized. The crucible inside the heating chamber 111 is then removed (e.g., Figure 3 Simultaneously, the crucible blank 4 in the receiving cavity 112 transforms into crucible 41, the discharge valve 22 is opened, and the carbonized graphite anode material in the funnel 21 enters the crucible 41 (e.g., Figure 4 );

[0055] S5. Repeat steps S3-S4 until the process is completed.

[0056] The technical solution provided by this invention involves creating a receiving cavity 112 within the insulation layer 11. The temperature of the receiving cavity 112 is lower than that of the heating cavity 111. This allows the graphitization process to be performed in the heating cavity 111, while the carbonization of the graphite anode material and the crucible calcination process can be performed in the receiving cavity 112. This enables heating objects at different target temperatures in a single furnace within a specific area. Simultaneously, the carbonized graphite anode material is automatically controlled by the discharge valve 22 to enter the calcined crucible 41. The pushing mechanism 3 pushes the crucible 41 from the receiving cavity 112 into the heating cavity 111. This allows the carbonized graphite anode material and the heated crucible 41 in the receiving cavity 112 to be directly pushed into the heating cavity 111 without needing to be removed, thus avoiding cooling of the graphite anode material and the crucible 41, reducing heat waste, and improving environmental benefits.

[0057] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A graphite negative electrode material carbonization, graphitization and crucible roasting integrated device, characterized in that, The graphite negative electrode material carbonization, graphitization and crucible roasting integrated device comprises a furnace body, a carbonization mechanism and a pushing mechanism. The furnace body comprises a heat preservation layer, a heating layer and a first blocking block. The heat preservation layer has a heating cavity in the center. A containing cavity is formed in the heat preservation layer. The containing cavity is used for placing a crucible blank. The containing cavity is communicated with the heating cavity through a first through hole. The containing cavity is communicated with the outside of the furnace body through a second through hole. The heating layer is arranged in the heating cavity. The first blocking block is used for plugging the second through hole. The carbonization mechanism comprises a hopper and a discharge valve.

2. The graphite negative material carbonization, graphitization and crucible roasting integrated device according to claim 1, characterized in that, The hopper is used for loading graphite negative electrode raw materials.

3. The graphite negative material carbonization, graphitization and crucible roasting integrated device according to claim 1, characterized in that, One end of the discharge valve is communicated with the outlet of the hopper.

4. The graphite negative material carbonization, graphitization and crucible roasting integrated device according to claim 3, characterized in that, The other end of the discharge valve is communicated with the inlet of the crucible blank.

5. The graphite negative material carbonization, graphitization and crucible roasting integrated device according to claim 1, characterized in that, The pushing mechanism is used for pushing the crucible in the containing cavity into the heating cavity.

6. A method for integrating carbonization, graphitization and crucible roasting of a graphite negative electrode material, characterized by, A third through hole is formed in the heat preservation layer. The third through hole is communicated with the heating cavity. The furnace body further comprises a second blocking block. The second blocking block is used for plugging the third through hole. A receiving groove is formed in the inner wall of the first through hole. The graphite negative electrode material carbonization, graphitization and crucible roasting integrated device further comprises a sealing mechanism. The sealing mechanism comprises a sealing block and a lifting driving member. The sealing block is movably arranged in the first through hole. The lifting driving member is connected with the sealing block and is used for driving the sealing block to move up and down. The sealing block is located in the first through hole or the receiving groove. A jack is formed in the outer wall of the heat preservation layer. The jack is communicated with the receiving groove. The lifting driving member comprises a lifting driving cylinder and a lifting rod. The cylinder body of the lifting driving cylinder is fixed to the outside of the heat preservation layer. The output shaft of the lifting driving cylinder is fixedly connected with one end of the lifting rod. The other end of the lifting rod is fixedly connected with the sealing block after penetrating through the jack. A guide hole is formed in the first blocking block. The pushing mechanism comprises a pushing cylinder, a pushing rod and a pushing plate. The cylinder body of the pushing cylinder is fixed to the first blocking block. The output shaft of the pushing cylinder is fixedly connected with one end of the pushing rod. The other end of the pushing rod is fixedly connected with the pushing plate after penetrating through the guide hole. The pushing plate is used for pushing the crucible. The heating layer is an electric resistance material layer. A feeding hole is formed in the heat preservation layer. The lower end of the feeding hole is located directly above the feeding port of the hopper. The furnace body further comprises a stopper. The stopper is used for plugging the feeding hole. A first handle is formed in the first blocking block. The graphite negative electrode material carbonization, graphitization and crucible roasting integrated device is suitable for the graphite negative electrode material carbonization, graphitization and crucible roasting integrated device as claimed in any one of claims 1-5. The graphite negative electrode material carbonization, graphitization and crucible roasting integrated device comprises the following steps. S1, placing a crucible blank in the containing cavity, loading graphite negative electrode raw materials in the hopper, electrifying the heating layer, heating the heating cavity by the heating layer, increasing the temperature in the containing cavity, carbonizing the graphite negative electrode raw materials and heating the crucible blank. S2, after a period of time, the crucible blank is changed into a crucible, opening the discharge valve, and the carbonized graphite negative electrode raw materials in the hopper enter the crucible. S3, by pushing mechanism for pushing the crucible in the containing cavity to the heating cavity, put a new crucible blank into the containing cavity, put new graphite negative raw material into the hopper, power on the heating layer, the heating layer heats the heating cavity, and the graphite negative material in the crucible in the heating cavity is graphitized, at the same time, the temperature in the containing cavity rises, the new graphite negative raw material is carbonized, and the crucible blank is heated at the same time; S4, after a period of heating, the graphite negative material in the crucible in the heating cavity is graphitized, the crucible in the heating cavity is taken out, at the same time, the crucible blank in the containing cavity is converted into a crucible, the discharge valve is opened, and the carbonized graphite negative raw material in the hopper enters the crucible; S5, repeat steps S3-S4 until the process is completed.

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