A high-purification graphite preparation furnace and use method thereof

Abstract

The invention discloses a high-purification graphite preparation furnace and a method for using the same, and belongs to the field of graphite purification technology. A high-purification graphite preparation furnace includes a workbench, and also includes: a mounting frame fixedly mounted on the workbench, on which a guide rod is fixedly mounted; a lower purification furnace body fixedly mounted on the guide rod; an upper purification furnace body slidably mounted on the guide rod; an insulation cylinder arranged in the upper purification furnace body; an electromagnetic heater fixedly mounted on the insulation cylinder; a graphite powder guide base fixedly mounted on the bottom inner wall of the insulation cylinder and arranged on the inner side of the electromagnetic heater; the present invention arranges a graphite powder guide base and a graphite purification cylinder, and combines the design of an air jet hole and an annular air jet groove, so that the graphite powder can be spirally lifted during the purification process, thereby increasing the distance between the graphite powder particles and reducing the mutual shielding between the particles. On the one hand, it is beneficial for the eddy current generated by electromagnetic heating to be evenly distributed in the graphite powder, thereby improving the uniformity of graphite powder heating.

Description

Technical Field

[0001] The invention relates to the technical field of graphite purification, in particular to a furnace for preparing high-purified graphite. Background Art

[0002] Graphite powder purification refers to the process of removing impurities in graphite powder through a series of physical or chemical methods to improve its purity and performance. Physical purification of graphite generally involves putting graphite powder into a purification furnace, then evacuating the furnace, introducing inert protective gas and purification gas, and heating to 2800 degrees Celsius to volatilize impurities and other elements in the graphite.

[0003] At present, graphite purification heating is generally carried out by electromagnetic heating system. When graphite powder is in the alternating magnetic field of the electromagnetic heating system, alternating eddy currents will be generated inside it. The eddy currents will cause the carriers inside the conductor to move irregularly at high speed. The collision and friction between the carriers will generate a large amount of heat energy, thereby causing the conductor itself to heat up. However, there is a lot of graphite powder in the purification furnace body. During purification, a stirring rod is generally used to stir and drive the graphite powder to flow for heating. However, the fluidity of this heated graphite powder is poor. Due to the small distance between graphite powder particles and poor fluidity, the eddy currents are unevenly distributed in the graphite powder, which will cause part of the graphite powder to be overheated due to the strong eddy current effect, while another part may be insufficiently heated, which will affect the purification effect and final performance of the graphite powder. In order to prevent the uneven heating of graphite powder during purification and lead to low purification quality, a high-purification graphite preparation furnace is proposed. Summary of the invention

[0004] The invention proposes a high-purification graphite preparation furnace in order to solve the problem of low heating efficiency caused by dense graphite powder in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A high-purification graphite preparation furnace comprises a workbench, and also comprises: a mounting frame fixedly mounted on the workbench, on which a guide rod is fixedly mounted; a lower purification furnace body fixedly mounted on the guide rod; an upper purification furnace body slidably mounted on the guide rod; an insulation cylinder arranged in the upper purification furnace body; an electromagnetic heater fixedly mounted on the insulation cylinder; a graphite powder guide base fixedly mounted on the bottom inner wall of the insulation cylinder and arranged on the inner side of the electromagnetic heater; a graphite purification cylinder fixedly mounted on the graphite powder guide base, the graphite The inner circle of the purification cylinder is a graphite purification chamber for purifying graphite powder, and a first graphite purification channel is arranged between the graphite purification cylinder and the electromagnetic heater; the purified gas and the protective gas are discharged from the top of the upper purification furnace body into the graphite purification chamber for circulation, and are blown out from the graphite powder guide base and the graphite purification cylinder, and the gas blown out from the graphite purification cylinder drives the graphite powder in the graphite purification chamber to spirally lift up and allows the graphite powder to enter the first graphite purification channel, and after the graphite powder falls to the bottom of the first graphite purification channel, it is blown into the graphite purification chamber by the gas blown out from the graphite powder guide base.

[0007] As a preferred embodiment of the present invention: the graphite purification cylinder comprises a cylinder body and a mounting block, the mounting block is a triangular prism, the tip of the mounting block faces the inner wall of the graphite powder guide base, and the mounting block is fixedly connected to the graphite powder guide base; a diversion cavity and an air jet hole are provided on the cylinder body, wherein the air jet hole is provided with multiple layers, each layer is provided with multiple air jet holes, and each layer of multiple air jet holes is distributed in a circular shape on the graphite purification cylinder; the air jet hole comprises a horizontally downward inclined hole and a horizontally curved hole, the top orifice of the inclined hole is connected to the diversion cavity, and the bottom orifice of the inclined hole is connected to the curved hole.

[0008] As a preferred embodiment of the present invention: an annular diverter hole is provided inside the graphite powder guide base, a second graphite purification channel is provided between the graphite powder guide base and the bottom of the graphite purification cylinder, an annular jet groove is provided on the inclined wall of the graphite powder guide base, and the two ends of the annular jet groove are respectively connected to the annular diverter hole and the second graphite purification channel; an air vent is provided in the mounting block, and the upper and lower ends of the air vent are respectively connected to the diverter cavity and the annular diverter hole.

[0009] As a preferred embodiment of the present invention: a gas channel is opened on the inner wall of the insulation cylinder, a mounting platform is fixedly installed in the lower purification furnace body, a gas box is fixedly installed on the mounting platform, a heat exchange mechanism is arranged in the gas box, a first gas pipe is fixedly installed at the bottom of the gas channel, the first gas pipe is connected to the gas box, a second gas pipe is fixedly installed on the top of the gas box, and the second gas pipe is connected to the annular diversion hole.

[0010] As a preferred embodiment of the present invention: a feed barrel is fixedly installed on the top of the upper purification furnace body, a feed hopper is fixedly installed in the feed barrel, a mounting plate is fixedly connected to the feed hopper, a drive motor is fixedly installed on the mounting plate, a rotating drum is rotatably connected to the tube body of the feed hopper, the output shaft of the drive motor and the rotating drum are fixedly connected with a first transmission gear, and two groups of first transmission gears are meshed, a fan blade is fixedly connected to the rotating drum, a stabilizing ring is fixedly installed on the outer ring of the fan blade, and the stabilizing ring is rotatably connected to the insulation drum.

[0011] As a preferred embodiment of the present invention: a heat insulation board is fixedly mounted on the heat insulation cylinder, an annular filter block is fixedly mounted between the heat insulation board and the heat insulation cylinder, and a molecular sieve is fixedly mounted on the top of the heat insulation cylinder.

[0012] As a preferred embodiment of the present invention: a mounting rod is slidably connected to the insulation board, a first magnet is fixedly mounted on one end of the mounting rod extending above the insulation board, a material guide cover is fixedly mounted on one end of the mounting rod extending below the insulation board, a cleaning brush is fixedly connected to the outer wall of the material guide cover, and the cleaning brush scrapes the outer wall of the annular filter block when it is reciprocated and lifted.

[0013] As a preferred embodiment of the present invention: a sealing ring is fixedly connected to the top of the material guide hood, and the sealing ring and the insulation plate are sealed and slidable. The insulation plate is provided with a ventilation groove connected up and down, and an annular sealing plate is arranged in the ventilation groove. A one-way valve is fixedly installed on the feed hopper. When the material guide hood descends, the gas on the insulation plate enters the cavity between the insulation plate and the material guide hood through the ventilation groove. When the material guide hood rises, the gas in the cavity enters the feed hopper through the one-way valve and is sprayed into the graphite purification cylinder from the feed hopper. After being sprayed out of the feed hopper, the gas moves downward from the top center of the graphite purification cylinder, driving the graphite powder spirally raised in the graphite purification cavity to diffuse into the first graphite purification channel.

[0014] As a preferred embodiment of the present invention: a driving plate is rotatably connected to the outer wall of the feed hopper, a second magnet is fixedly installed on the bottom of the driving plate, the second magnet is attracted to the first magnet, the top of the heat insulation plate is rotatably connected to a transmission shaft, the transmission shaft is connected to the rotating drum through a pulley set, multiple groups of gear rings are fixedly connected to the driving plates, and a second transmission gear meshing with the gear ring is fixedly connected to the transmission shaft.

[0015] A graphite purification method comprises the following steps:

[0016] Step 1: Put graphite powder into the purification chamber inside the purification furnace, evacuate and fill with purification gas and protective gas;

[0017] Step 2: heating the graphite powder by an electromagnetic heating system;

[0018] Step 3: During the heating process, a spiral airflow is blown out from the wall of the purification chamber, and the graphite powder inside the purification chamber is lifted up from top to bottom in sequence by the spiral airflow, and the purified gas and protective gas are filled downward from the top of the center of the purification chamber, and the graphite powder on the top of the purification chamber is driven to move around in coordination with the spiral airflow;

[0019] Step 4: Make the graphite powder diffused from the top to the surroundings fall from another channel to the bottom and enter the purification chamber again, so that the graphite powder circulates.

[0020] Compared with the prior art, the present invention provides a high-purity graphite preparation furnace, which has the following beneficial effects:

[0021] 1. The high-purity graphite preparation furnace, by providing a graphite powder guiding base and a graphite purification cylinder, combined with the design of the jet hole and the annular jet groove, enables the graphite powder to be spirally lifted during the purification process, thereby increasing the distance between the graphite powder particles and reducing the mutual shielding between the particles. On the one hand, it is beneficial for the eddy current generated by electromagnetic heating to be evenly distributed in the graphite powder, thereby improving the uniformity of graphite powder heating. On the other hand, it avoids the accumulation of graphite powder, which leads to uneven distribution of eddy currents between the graphite powders and reduces the heating efficiency of the graphite powder. In addition, since the graphite powder is lifted by blowing the inert gas and the purifier gas, the contact area between the purified gas and the graphite powder is also increased, thereby further improving the purification effect and purification efficiency of the graphite powder.

[0022] 2. The high-purity graphite preparation furnace moves downward from the top center of the graphite purification cylinder through the gas ejected from the feed hopper, and forms convection with the spirally raised graphite powder. This airflow not only promotes the diffusion of graphite powder into the first graphite purification channel, but also disperses the adsorbed graphite powder through shearing action, thereby improving the distribution uniformity of graphite powder in the graphite purification chamber;

[0023] 3. The high-purity graphite preparation furnace effectively prevents the graphite powder from clogging the annular filter block through the reciprocating scraping of the cleaning brush, ensuring the continuous and efficient gas circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of a high-purity graphite preparation furnace proposed by the present invention;

[0025] Figure 2 A schematic diagram of a partial three-dimensional structure of a high-purity graphite preparation furnace proposed by the present invention;

[0026] Figure 3 A cross-sectional view of a graphite purification cylinder of a high-purity graphite preparation furnace proposed by the present invention;

[0027] Figure 4A cross-sectional view of a high-purity graphite preparation furnace proposed by the present invention;

[0028] Figure 5 A high-purity graphite preparation furnace proposed by the present invention Figure 4 The structural diagram of part A in the figure;

[0029] Figure 6 A partial cross-sectional view of a purification furnace body on a high-purity graphite preparation furnace proposed by the present invention Figure 1 ;

[0030] Figure 7 A partial cross-sectional view of a purification furnace body on a high-purity graphite preparation furnace proposed by the present invention Figure 2 ;

[0031] Figure 8 This is a schematic diagram of the structure of a gas jet hole for a high-purity graphite preparation furnace proposed by the present invention;

[0032] Fig. 9 A partial cross-sectional view of a graphite purification cylinder of a high-purity graphite preparation furnace proposed by the present invention;

[0033] Fig.10 The figure is a cross-sectional view of a gas box of a furnace for preparing high-purified graphite proposed by the present invention.

[0034] In the figure: 1. workbench; 2. mounting frame; 3. guide rod; 4. lower purification furnace body; 5. upper purification furnace body; 6. lifting motor; 7. screw rod; 8. mounting table; 9. material guide cover; 10. heat insulation cylinder; 11. electromagnetic heater; 12. sealing ring; 13. guide base; 14. mounting block; 15. graphite purification cylinder; 16. graphite purification chamber; 17. first graphite purification channel; 18. second graphite purification channel; 19. heat insulation board; 20. one-way valve; 21. annular filter block; 22. molecular sieve; 23. gas channel; 24, first air pipe; 25, air box; 26, second air pipe; 27, ventilation groove; 28, cleaning brush; 29, mounting rod; 30, first magnet; 31, annular sealing plate; 32, annular diverter hole; 33, annular jet groove; 34, ventilation hole; 35, diverter cavity; 36, jet hole; 37, feed hopper; 38, mounting plate; 39, drive motor; 40, rotating drum; 41, first transmission gear; 42, fan blade; 43, transmission shaft; 44, pulley group; 45, drive plate; 46, second magnet. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] Example: Refer to Figure 1 and Figure 2 A high-purification graphite preparation furnace comprises a workbench 1, and also comprises: a mounting frame 2 fixedly mounted on the workbench 1, a guide rod 3 fixedly mounted on the mounting frame 2; a lower purification furnace body 4 fixedly mounted on the guide rod 3; an upper purification furnace body 5 slidably mounted on the guide rod 3; a feed barrel fixedly mounted on the top of the upper purification furnace body 5, a feed hopper 37 fixedly mounted in the feed barrel, a feed valve mounted on the top of the feed barrel, the feed valve is used to control whether the interior of the purification furnace is sealed, and two air inlet pipes are mounted on the top of the feed barrel, which are respectively used to input protective gas and purification gas into the interior of the purification furnace. At the same time, a vacuum pump is installed on the workbench 1, and the suction pipe of the vacuum pump is connected to the side wall of the feed barrel. After the feeding is completed, the air inside the purification furnace is sucked by the vacuum pump to keep the interior of the purification furnace vacuum, and then the protective gas and purification gas are added therein.

[0038] Reference Figure 1 and Figure 2 A lifting motor 6 is fixedly installed on the top of the workbench 1, and a screw rod 7 is fixedly installed on the output end of the lifting motor 6. The screw rod 7 is threadedly connected to the upper purification furnace body 5. When the lifting motor 6 is started, the lifting motor 6 drives the screw rod 7 to rotate forward or reverse, and the screw rod 7 drives the upper purification furnace body 5 to rise or fall, thereby controlling the opening of the upper purification furnace body 5 and the lower purification furnace body 4, which is convenient for maintenance of the interior of the purification furnace.

[0039] Reference Figure 3-Figure 4, an insulation cylinder 10 is arranged in the upper purification furnace body 5; an electromagnetic heater 11 is fixedly installed on the insulation cylinder 10; a graphite powder guide base 13 is fixedly installed on the bottom inner wall of the insulation cylinder 10 and is arranged on the inner side of the electromagnetic heater 11; a graphite purification cylinder 15 is fixedly installed on the graphite powder guide base 13, the inner circle of the graphite purification cylinder 15 is a graphite purification cavity 16 for purifying graphite powder, and a first graphite purification channel 17 is arranged between the graphite purification cylinder 15 and the electromagnetic heater 11, wherein the graphite purification cylinder 15 includes a cylinder body and a mounting block 14, the mounting block 14 is a triangular prism, the tip of the mounting block 14 faces the inner wall of the graphite powder guide base 13, and the mounting block 14 is fixedly connected to the graphite powder guide base 13; the cylinder body is opened A flow diversion chamber 35 and an air jet hole 36 are provided, wherein the air jet hole 36 is provided in multiple layers, each layer of the air jet holes 36 is provided with multiple air jet holes 36, and each layer of the multiple air jet holes 36 is circumferentially distributed on the graphite purification cylinder 15; the air jet holes 36 include a horizontally downwardly inclined inclined hole and a horizontally curved curved hole, the top orifice of the inclined hole is connected to the flow diversion chamber 35, and the bottom orifice of the inclined hole is connected to the curved hole, an annular flow diversion hole 32 is provided inside the graphite powder guide base 13, a second graphite purification channel 18 is provided between the graphite powder guide base 13 and the bottom of the graphite purification cylinder 15, an annular air jet groove 33 is provided on the inclined wall of the graphite powder guide base 13, and the two ends of the annular air jet groove 33 are respectively connected to the annular flow diversion hole 32 and the second graphite purification channel 18; A vent hole 34 is provided in the mounting block 14, and the upper and lower ends of the vent hole 34 are connected to the diverter chamber 35 and the annular diverter hole 32 respectively; the purified gas and the protective gas are discharged from the top of the upper purification furnace body 5 into the graphite purification chamber 16 for circulation, and are blown out from the graphite powder guide base 13 and the graphite purification cylinder 15. The gas blown out of the graphite purification cylinder 15 drives the graphite powder in the graphite purification chamber 16 to spirally lift up and allow the graphite powder to enter the first graphite purification channel 17. After the graphite powder falls to the bottom of the first graphite purification channel 17, it is blown into the graphite purification chamber 16 by the gas blown out of the graphite powder guide base 13. A gas channel 23 is provided on the inner wall of the insulation cylinder 10, and a mounting table 8 is fixedly installed in the lower purification furnace body 4, and a mounting table 8 is fixed on the mounting table 8. An air box 25 is installed, and a heat exchange mechanism is arranged in the air box 25. A first air pipe 24 is fixedly installed at the bottom of the gas channel 23, and the first air pipe 24 is communicated with the air box 25. A second air pipe 26 is fixedly installed on the top of the air box 25, and the second air pipe 26 is communicated with the annular diverter hole 32. A mounting plate 38 is fixedly connected to the feed hopper 37, and a driving motor 39 is fixedly installed on the mounting plate 38. A rotating drum 40 is rotatably connected to the tube body of the feed hopper 37. The output shaft of the driving motor 39 and the rotating drum 40 are both fixedly connected with a first transmission gear 41, and two groups of first transmission gears 41 are meshed. A fan blade 42 is fixedly connected to the rotating drum 40, and a stabilizing ring is fixedly installed on the outer ring of the fan blade 42, and the stabilizing ring is rotatably connected to the heat insulation drum 10.An insulation board 19 is fixedly mounted on the insulation cylinder 10, an annular filter block 21 is fixedly mounted between the insulation board 19 and the insulation cylinder 10, and a molecular sieve 22 is fixedly mounted on the top of the insulation cylinder 10. ;

[0040] In this embodiment, the drive motor 39 is started, and the drive motor 39 drives the drum 40 to rotate through the first transmission gear 41, and the drum 40 drives the fan blades 42 to rotate. The pressure at the bottom of the fan blades 42 is less than the pressure above the fan blades 42. Under the action of the pressure difference and under the filter plate of the annular filter block 21, the gas is separated from the graphite powder, and the gas passes through the annular filter block 21 into the top of the insulation board 19, and enters the gas channel 23 under the action of the fan blades 42, and then enters the air box 25 through the first air pipe 24, and then enters the annular diversion hole 32 from the air box 25 through the second air pipe 26 for diversion.

[0041] The graphite powder separated at the annular filter block 21 falls onto the guide base 13 under the action of gravity, and then flows into the graphite purification chamber 16 along the inclined surface of the guide base 13, and a part of the gas in the annular diversion hole 32 is ejected from the annular jet groove 33, promoting the graphite powder to flow into the graphite purification chamber 16;

[0042] The remaining gas in the annular diverter hole 32 enters the diverter chamber 35 through the vent hole 34 and then is ejected through the jet hole 36. The airflow ejected from the jet hole 36 forms a spiral rising airflow in the graphite purification chamber 16, and cooperates with the airflow ejected from the annular jet groove 33 to lift the graphite powder in the graphite purification chamber 16.

[0043] When the graphite powder is lifted, at first, the graphite powder accumulates in the graphite purification chamber 16. When the graphite accumulates, the graphite at the bottom blocks the gas injection hole 36 below. Therefore, the circulating gas is first ejected from the top to form a spiral upward gas at the top, driving the graphite powder at the top to be lifted. Then, as the graphite powder above is lifted, the gas injection hole 36 below is connected. Therefore, in this embodiment, the graphite powder starts from the top and gradually spreads downward, so that the graphite powder inside the graphite purification chamber 16 is gradually lifted as a whole, so that the graphite powder is more evenly distributed inside the graphite purification chamber 16, and the distance between all the graphite powders is increased, so that the eddy current generated by the electromagnetic heater 11 between the graphite powders is more uniform.

[0044] In this embodiment, impurities generated by purification can be adsorbed through the micropores of the molecular sieve 22, so that the inert gas and the purified gas that are re-blown into the graphite powder remain clean.

[0045] In summary, by setting up the graphite powder guiding base 13 and the graphite purification cylinder 15, combined with the design of the jet hole 36 and the annular jet groove 33, the graphite powder can be spirally lifted during the purification process, thereby increasing the distance between the graphite powder particles and reducing the mutual occlusion between the particles. On the one hand, it is beneficial for the eddy current generated by electromagnetic heating to be evenly distributed in the graphite powder, thereby improving the uniformity of graphite powder heating. On the other hand, it avoids the accumulation of graphite powder, which leads to uneven distribution of eddy currents between graphite powders and reduces the heating efficiency of graphite powder.

[0046] Furthermore, since the graphite powder is lifted by blowing the inert gas and the purifier gas, the contact area between the purified gas and the graphite powder is increased, thereby further improving the purification effect and purification efficiency of the graphite powder.

[0047] In addition, when the graphite powder purification reaches a predetermined standard, the heat exchange device inside the gas box 25 can be started. This heat exchange device usually includes a cooling medium (such as water, coolant or other low-temperature fluid) and a heat exchange pipe or heat exchanger, which is used to absorb and take away the heat of the circulating gas. The circulating gas is cooled by the heat exchange device inside. Due to the previous design of the jet hole 36 and the annular jet groove 33, the graphite powder is spirally lifted during the purification process, thereby increasing the contact area between the gas and the graphite powder. This design also plays an important role in the cooling process, so that the cooled gas can contact the graphite powder more fully. When the cooled gas contacts the high-temperature graphite powder, it will quickly take away the heat from the graphite powder. Due to the large contact area and good gas fluidity, this heat transfer process is very efficient, which can achieve rapid cooling of the graphite powder and improve the efficiency of the overall purification process of the graphite powder.

[0048] Reference Figure 4-Figure 7The heat insulation board 19 is slidably connected with a mounting rod 29, and a first magnet 30 is fixedly mounted on one end of the mounting rod 29 extending above the heat insulation board 19, and a material guide cover 9 is fixedly mounted on one end of the mounting rod 29 extending below the heat insulation board 19, and a cleaning brush 28 is fixedly connected to the outer wall of the material guide cover 9, and the cleaning brush 28 scrapes the outer wall of the annular filter block 21 when it is lifted and lowered; a sealing ring 12 is fixedly connected to the top of the material guide cover 9, and the sealing ring 12 and the heat insulation board 19 are sealed and slidable, and a ventilation groove 27 connected up and down is opened on the heat insulation board 19, and an annular sealing plate 31 is arranged in the ventilation groove 27, and a one-way valve 20 is fixedly mounted on the feed hopper 37, and when the material guide cover 9 descends, the gas on the heat insulation board 19 enters between the heat insulation board 19 and the material guide cover 9 through the ventilation groove 27 In the cavity, when the material guide cover 9 rises, the gas in the cavity enters the feed hopper 37 through the one-way valve 20, and is sprayed into the graphite purification cylinder 15 from the feed hopper 37. After the gas is sprayed out from the feed hopper 37, it moves downward from the top center of the graphite purification cylinder 15, driving the graphite powder spirally raised in the graphite purification chamber 16 to diffuse into the first graphite purification channel 17; a driving plate 45 is rotatably connected to the outer wall of the feed hopper 37, and a second magnet 46 is fixedly installed at the bottom of the driving plate 45, and the second magnet 46 is attracted to the first magnet 30. The top of the insulation board 19 is rotatably connected to the transmission shaft 43, and the transmission shaft 43 is connected to the rotating drum 40 through a pulley group 44. A plurality of groups of driving plates 45 are fixedly connected to gear rings, and a second transmission gear meshing with the gear ring is fixedly connected to the transmission shaft 43.

[0049] When the driving motor 39 drives the drum 40 to rotate, the drum 40 drives the transmission shaft 43 to rotate through the pulley group 44, and the transmission shaft 43 rotates through the second transmission gear, and the second transmission gear drives the gear ring to rotate, and the gear ring rotates the driving plate 45. During the rotation of the driving plate 45, the first magnet 30 and the second magnet 46 are intermittently attracted to each other. In this process, under the action of gravity and magnet adsorption, the mounting rod 29 drives the material guide cover 9 to reciprocate and rise and fall. During the reciprocating lifting of the material guide cover 9, on the one hand, the material guide cover 9 drives the cleaning brush 28 to scrape the surface of the annular filter block 21 up and down to remove the graphite powder adsorbed on the surface of the annular filter block 21, so as to prevent the graphite powder from being adsorbed on the annular filter block 21 and the graphite powder from blocking the annular filter block 21 and affecting the gas circulation. On the other hand, during the reciprocating lifting of the material guide cover 9, the cleaning brush 28 drives the cleaning brush 28 to scrape the surface of the annular filter block 21 up and down to remove the graphite powder adsorbed on the surface of the annular filter block 21 and preventing the graphite powder from blocking the annular filter block 21 and affecting the gas circulation. Under the action of the annular sealing plate 31 and the one-way valve 20, the gas on the top of the insulation plate 19 is absorbed and then discharged into the feed hopper 37. At this time, since the feed valve on the top of the mounting cylinder is closed, the pressure on the top of the feed hopper 37 is greater than the pressure below, thereby preventing the graphite powder in the graphite purification chamber 16 from being discharged into the feed hopper 37. At the same time, the gas is discharged downward from the feed hopper 37 into the graphite purification chamber 16. Since the pipeline of the feed hopper 37 is coaxial with the graphite purification chamber 16, the downwardly discharged airflow is discharged downward from the top of the center of the graphite purification chamber 16, and cooperates with the spirally rising airflow, which can not only promote the graphite powder and the airflow to flow into the first graphite purification channel 17, but also can shear the adsorbed graphite powder, thereby improving the dispersion effect of the graphite powder, thereby improving the uniformity of the distribution of the graphite powder in the graphite purification chamber 16.

[0050] In summary, the gas ejected from the feed hopper 37 moves downward from the top center of the graphite purification cylinder 15, forming convection with the spirally lifted graphite powder. This convection not only promotes the diffusion of the graphite powder into the first graphite purification channel 17, but also disperses the adsorbed graphite powder through shearing action, thereby improving the distribution uniformity of the graphite powder in the graphite purification chamber 16.

[0051] The reciprocating scraping of the cleaning brush 28 effectively prevents the annular filter block 21 from being blocked by graphite powder, thereby ensuring continuous and efficient gas circulation.

[0052] A graphite purification method comprises the following steps:

[0053] Step 1: Put graphite powder into the purification chamber inside the purification furnace, evacuate and fill with purification gas and protective gas;

[0054] Step 2: heating the graphite powder by an electromagnetic heating system;

[0055] Step 3: During the heating process, a spiral airflow is blown out from the wall of the purification chamber, and the graphite powder inside the purification chamber is lifted up from top to bottom in sequence by the spiral airflow, and the purified gas and protective gas are filled downward from the top of the center of the purification chamber, and the graphite powder on the top of the purification chamber is driven to move around in coordination with the spiral airflow;

[0056] Step 4: Make the graphite powder diffused from the top to the surroundings fall from another channel to the bottom and enter the purification chamber again, so that the graphite powder circulates.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A furnace for preparing high-purity graphite, comprising a workbench (1), characterized in that: Also includes: A mounting frame (2) fixedly mounted on the workbench (1), wherein a guide rod (3) is fixedly mounted on the mounting frame (2); A lower purification furnace body (4) is fixedly mounted on the guide rod (3); and an upper purification furnace body (5) is slidably mounted on the guide rod (3); A heat-insulating cylinder (10) disposed in the upper purification furnace body (5); An electromagnetic heater (11) fixedly mounted on the heat-insulating cylinder (10); A graphite powder guide base (13) is fixedly mounted on the bottom inner wall of the heat insulation cylinder (10) and is arranged inside the electromagnetic heater (11); A graphite purification cylinder (15) is fixedly mounted on the graphite powder guide base (13); the inner ring of the graphite purification cylinder (15) is a graphite purification chamber (16) for purifying graphite powder; and a first graphite purification channel (17) is provided between the graphite purification cylinder (15) and the electromagnetic heater (11); Purification gas and protective gas are discharged from the top of the upper purification furnace body (5) into the graphite purification chamber (16) for circulation, and are blown out from the graphite powder guide base (13) and the graphite purification cylinder (15). The gas blown out from the graphite purification cylinder (15) drives the graphite powder in the graphite purification chamber (16) to spirally lift up and causes the graphite powder to enter the first graphite purification channel (17). After the graphite powder falls to the bottom of the first graphite purification channel (17), it is blown into the graphite purification chamber (16) by the gas blown out from the graphite powder guide base (13); The graphite purification cylinder (15) comprises a cylinder body and a mounting block (14); the mounting block (14) is a triangular prism; the tip of the mounting block (14) faces the inner wall of the graphite powder guide base (13); the mounting block (14) is fixedly connected to the graphite powder guide base (13); The cylinder body is provided with a flow distribution cavity (35) and an air jet hole (36), wherein the air jet hole (36) is provided in multiple layers, each layer is provided with multiple air jet holes (36), and each layer of the multiple air jet holes (36) are distributed in a circular shape on the graphite purification cylinder (15); The air injection hole (36) comprises a horizontally downwardly inclined hole and a horizontally curved hole, the top opening of the inclined hole is connected to the diversion cavity (35), and the bottom opening of the inclined hole is connected to the curved hole; An annular flow diversion hole (32) is provided inside the graphite powder guide base (13), a second graphite purification channel (18) is provided between the graphite powder guide base (13) and the bottom of the graphite purification cylinder (15), an annular air injection groove (33) is provided on the inclined wall of the graphite powder guide base (13), and two ends of the annular air injection groove (33) are respectively connected to the annular flow diversion hole (32) and the second graphite purification channel (18); A vent hole (34) is provided in the mounting block (14), and the upper and lower ends of the vent hole (34) are respectively connected to the diversion cavity (35) and the annular diversion hole (32); A gas passage (23) is provided on the inner wall of the heat-insulating cylinder (10); a mounting platform (8) is fixedly installed in the lower purification furnace body (4); a gas box (25) is fixedly installed on the mounting platform (8); a heat exchange mechanism is arranged in the gas box (25); a first gas pipe (24) is fixedly installed at the bottom of the gas passage (23); the first gas pipe (24) is communicated with the gas box (25); a second gas pipe (26) is fixedly installed on the top of the gas box (25); the second gas pipe (26) is communicated with the annular diversion hole (32); A feed barrel is fixedly mounted on the top of the upper purification furnace body (5), a feed hopper (37) is fixedly mounted inside the feed barrel, a mounting plate (38) is fixedly connected to the feed hopper (37), a drive motor (39) is fixedly mounted on the mounting plate (38), a rotating drum (40) is rotatably connected to the tube body of the feed hopper (37), the output shaft of the drive motor (39) and the rotating drum (40) are both fixedly connected with a first transmission gear (41), and two sets of first transmission gears (41) are meshed, a fan blade (42) is fixedly connected to the rotating drum (40), a stabilizing ring is fixedly mounted on the outer ring of the fan blade (42), and the stabilizing ring is rotatably connected to the heat insulation drum (10).

2. A high-purity graphite preparation furnace according to claim 1, characterized in that: A heat insulation plate (19) is fixedly mounted on the heat insulation cylinder (10), an annular filter block (21) is fixedly mounted between the heat insulation plate (19) and the heat insulation cylinder (10), and a molecular sieve (22) is fixedly mounted on the top of the heat insulation cylinder (10).

3. A high-purity graphite preparation furnace according to claim 2, characterized in that: A mounting rod (29) is slidably connected to the heat insulation board (19); a first magnet (30) is fixedly mounted on one end of the mounting rod (29) extending above the heat insulation board (19); a material guide cover (9) is fixedly mounted on one end of the mounting rod (29) extending below the heat insulation board (19); a cleaning brush (28) is fixedly connected to the outer wall of the material guide cover (9); and the cleaning brush (28) scrapes the outer wall of the annular filter block (21) when it is reciprocated and lifted.

4. A high-purity graphite preparation furnace according to claim 3, characterized in that: A sealing ring (12) is fixedly connected to the top of the material guide hood (9), and the sealing ring (12) slides in a sealed manner with the heat insulation plate (19). The heat insulation plate (19) is provided with a ventilation groove (27) communicating with each other from top to bottom, and an annular sealing plate (31) is arranged in the ventilation groove (27). A one-way valve (20) is fixedly installed on the feed hopper (37). When the material guide hood (9) descends, the gas on the heat insulation plate (19) passes through the ventilation groove (27). The gas enters the cavity between the heat insulation plate (19) and the guide cover (9). When the guide cover (9) rises, the gas in the cavity enters the feed hopper (37) through the one-way valve (20) and is sprayed from the feed hopper (37) into the graphite purification cylinder (15). After being sprayed from the feed hopper (37), the gas moves downward from the top center of the graphite purification cylinder (15), driving the graphite powder spirally raised in the graphite purification chamber (16) to diffuse into the first graphite purification channel (17).

5. A high-purity graphite preparation furnace according to claim 3, characterized in that: A driving plate (45) is rotatably connected to the outer wall of the feed hopper (37), a second magnet (46) is fixedly mounted on the bottom of the driving plate (45), the second magnet (46) attracts the first magnet (30), a transmission shaft (43) is rotatably connected to the top of the heat insulation plate (19), the transmission shaft (43) is connected to the rotating drum (40) via a pulley group (44), a plurality of groups of driving plates (45) are fixedly connected to toothed rings, and a second transmission gear meshing with the toothed rings is fixedly connected to the transmission shaft (43).

6. A graphite purification method, using the high-purity graphite preparation furnace according to claim 1, characterized in that: The following steps are involved: Step 1: Put graphite powder into the purification chamber inside the purification furnace, evacuate and fill with purification gas and protective gas; Step 2: heating the graphite powder by an electromagnetic heating system; Step 3: During the heating process, a spiral airflow is blown out from the wall of the purification chamber, and the graphite powder inside the purification chamber is lifted up from top to bottom in sequence by the spiral airflow, and the purified gas and protective gas are filled downward from the top of the center of the purification chamber, and the graphite powder on the top of the purification chamber is driven to move around in coordination with the spiral airflow; Step 4: Make the graphite powder diffused from the top to the surroundings fall from another channel to the bottom and enter the purification chamber again, so that the graphite powder circulates.

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