High-temperature purification treatment device for raw material graphite powder of negative electrode of lithium ion battery

Abstract

The invention discloses a lithium ion battery negative electrode raw material graphite powder high-temperature purification treatment device, and belongs to the technical field of graphite powder purification, the lithium ion battery negative electrode raw material graphite powder high-temperature purification treatment device comprises a purification furnace body, the top and the bottom of the purification furnace body are connected with an inlet pipe and a discharge pipe respectively, and the interior of the purification furnace body is rotationally connected with a first rotating pipe; a hollow spiral conveying blade is wound on the outer side of the first rotating pipe, a conical disc is fixedly connected to the bottom end of the first rotating pipe, an inverted-conical disc is fixedly connected to the bottom end of the conical disc, built-in grooves are formed in the inclined face of the inverted-conical disc at equal intervals, and telescopic blocks are slidably connected to the interiors of the built-in grooves; and the telescopic blocks are connected with the inner ends of the built-in grooves through reset springs, and the inclined faces of the outer sides of the telescopic blocks are rotationally connected with grinding rollers. According to the graphite powder crushing device disclosed by the invention, the graphite powder is hammered while being extruded by utilizing the mutual cooperation of the telescopic blocks, the grinding rollers and the barrier strips, so that the crushing effect on the graphite powder is further improved, and gasified impurities generated by purification are convenient to overflow.

Description

Technical Field

[0001] The present application relates to the technical field of graphite powder purification, and in particular to a high-temperature purification processing device for graphite powder, a raw material for negative electrodes of lithium-ion batteries. Background Art

[0002] Graphite is a high-energy crystalline carbon material. Its unique structure and properties of electrical conductivity, thermal conductivity, lubricity, high-temperature resistance, and chemical stability make it highly valuable in high-performance materials. It is widely used in metallurgy, machinery, environmental protection, chemical engineering, refractories, electronics, medicine, military affairs, aerospace, and other fields. As an essential non-metallic material for the development of modern industry and high-tech, it plays an increasingly important role in the development of the national economy. Methods for graphite purification primarily include flotation, alkaline-acid separation, hydrofluoric acid separation, chlorination roasting, and high-temperature separation. High-temperature purification, also known as physical purification, utilizes graphite's high-temperature resistance by placing it in an electric furnace, isolating it from air, and heating it to volatilize impurities, thereby improving the concentrate grade.

[0003] In the prior art, such as the natural graphite negative electrode powder purification processing device and method shown in the authorization publication number CN114436252B, the crushed graphite powder raw material falls onto the truncated rotating plate, is collected by the truncated rotating plate and the bell mouth, and then enters between the outer fixed cylinder and the inner support cylinder. The lifting cam rotates under the drive of the stirring shaft to squeeze the inner extrusion plate. After the inner extrusion plate is squeezed, it drives the guide rod to push the outer pressure plate toward the inner wall of the purification furnace body to squeeze the graphite powder raw material and crush it. When the lifting cam moves to the next inner extrusion plate, the support spring drives the inner extrusion plate and the outer pressure plate to return to their original position. During this process, the cam structure is used to continuously reciprocate the extrusion plates. However, during this process, when the cam pushes one extrusion plate, the graphite powder raw material at the position of the other extrusion plates does not have the extrusion force. Therefore, it is easy to cause the agglomerated graphite powder to not be crushed, thereby affecting the purification effect of the graphite powder. Therefore, the present invention provides a high-temperature purification processing device for lithium-ion battery negative electrode raw material graphite powder. Summary of the Invention

[0004] The main purpose of this application is to provide a high-temperature purification processing device for graphite powder, a raw material for the negative electrode of a lithium-ion battery. The graphite powder is squeezed by utilizing the side of the telescopic block, the rolling roller and the baffle bar, thereby improving the crushing effect of the graphite powder. At the same time, the telescopic block and the rolling roller suddenly pop out to hammer the graphite powder, thereby further improving the crushing effect of the graphite powder and facilitating the overflow of the gasified impurities produced by purification.

[0005] To achieve the above objectives, the present application provides a high-temperature purification processing device for graphite powder, a raw material for negative electrodes of lithium-ion batteries, comprising a purification furnace body, wherein the top and bottom of the purification furnace body are respectively connected to an inlet pipe and an outlet pipe, the interior of the purification furnace body is rotatably connected to a rotating tube 1, and the outer side of the rotating tube 1 is wound with a hollow spiral conveying blade, and the interior of the rotating tube 1 is connected to the interior of the hollow spiral conveying blade through a through hole;

[0006] The bottom end of the rotating tube is fixedly connected to a conical disk, and an inverted conical disk is fixedly connected to the bottom end of the conical disk, and built-in grooves are opened at equal intervals on the inclined surface of the inverted conical disk, and telescopic blocks are slidably connected inside the built-in grooves, and the telescopic blocks are connected to the inner ends of the built-in grooves through return springs, and a rolling roller is rotatably connected to the inclined surface of the outer side of the telescopic block;

[0007] A rolling cylinder is fixedly connected to the interior of the purification furnace body outside the conical disk and the inverted conical disk, and a material guide pipe is fixedly connected to the middle position of the bottom end of the rolling cylinder;

[0008] A fixed tube is fixedly connected to the inside of the guide tube at the bottom end of the inverted conical disk, and two groups of plasma spray gun assemblies are rotatably connected to the bottom end of the fixed tube at equal intervals along the axial direction thereof, and the two groups of plasma spray gun assemblies are connected by a second connecting tube, and a rotating rod is fixedly connected to the middle position of the bottom of the plasma spray gun assembly at the bottom end, and stirring rods are distributed at equal intervals along the upper side of the rotating rod in the axial direction thereof, a second cross-shaped fixing plate is fixed to the inside of the fixed tube and the second connecting tube, and the second cross-shaped fixing plate and the rotating rod are connected by the second fixing rod.

[0009] Preferably, a driving motor is installed at the top of the purification furnace body, and a driving rod is connected to the output end of the driving motor, and a fixing sleeve is fixed at the connection between the driving rod and the rotating tube, and a bearing corresponding to the bottom end of the driving rod and the top end of the rotating tube is symmetrically installed inside the fixing sleeve, the bottom end of the driving rod is fixedly connected to a fixing rod, and a cross-shaped fixing plate connected to the end of the fixing rod is fixed to the top of the rotating tube, and an air intake pipe is connected to the outside of the fixing sleeve between the driving rod and the rotating tube.

[0010] Preferably, the hollow spiral conveying blade is provided with spray gun heads 2 at equal intervals along its spiral path.

[0011] Preferably, the plasma spray gun assembly includes two symmetrically arranged bearings, and the two bearings are connected by a rotating tube. The inner wall of the rotating tube is fixed with rotating blades at equal intervals along its circumferential direction. A spray gun nozzle is opened on the rotating tube between two adjacent rotating blades. A spray gun pipe is connected to the position of the spray gun nozzle, and a spray gun head is installed on the spray gun pipe.

[0012] Preferably, a stirring drum connected to the bottom end of the material guide tube is fixed inside the purification furnace body at the position of the rotating rod, a cooling chamber is formed between the outer wall of the stirring drum and the inner wall of the purification furnace body, and a water injection pipe connected to the cooling chamber is opened on the purification furnace body.

[0013] Preferably, the upper part of the purification furnace body is connected to a connecting pipe 1 that is in communication with the purification furnace body.

[0014] Preferably, baffles are fixed at equal intervals on the inclined surface on the inner side of the rolling cylinder.

[0015] The benefits of the present application are as follows: first, the driving rod is driven to rotate by a driving motor, and the driving rod and the rotating tube are fixedly connected by using the fixing rod 1 and the cross-shaped fixing plate 1, thereby driving the rotating tube 1 to rotate, and at the same time, the combustible gas is introduced through the air inlet pipe and enters the interior of the rotating tube 1. During the rotation of the rotating tube 1, the hollow spiral conveying blade is driven to rotate, thereby conveying the graphite powder entering the interior of the purification furnace body. During the conveying process by the hollow spiral conveying blade, since the interior of the hollow spiral conveying blade is a hollow structure, and the rotating tube 1 is connected to the hollow cavity inside the hollow spiral conveying blade through the through hole, the combustible gas enters the hollow cavity inside the hollow spiral conveying blade, and then the plasma flame is sprayed by the spray gun head 2, thereby preheating the graphite powder entering the interior of the purification furnace body, thereby improving the dryness of the graphite powder and improving the impurity removal effect;

[0016] Secondly, the graphite powder is transported to the conical disk, and the inclined surface of the conical disk is used to slide the graphite powder into the interior of the rolling cylinder, thereby driving the conical disk and the inverted conical disk to rotate under the rotation. During the rotation of the inverted conical disk, the graphite powder entering the interior of the rolling cylinder is ground, so that the agglomerated graphite powder can be crushed. It is explained here that in the process of preheating through the spray gun head 2 mentioned above, it is convenient to remove moisture from the graphite powder, so as to prevent the presence of moisture in the graphite powder during the grinding process, which causes the ground graphite powder to be in cake-like shape and stick to each other. In the process of grinding the graphite powder, the telescopic block and the mutual cooperation between the rolling roller and the baffle are simultaneously utilized, so that During the rotation of the inverted conical disk, when the telescopic block and the rolling roller rub against each other with the baffle, the graphite powder is squeezed by the side surfaces of the telescopic block, the rolling roller and the baffle, thereby improving the crushing effect of the graphite powder. When the telescopic block and the rolling roller slide along the inside of the built-in groove, the return spring is squeezed. At this time, the telescopic block and the rolling roller are blocked by the baffle and shrink, and are located above the baffle. Then, during the rotation process, when the telescopic block and the rolling roller are separated from the baffle, the telescopic block and the rolling roller are suddenly ejected under the action of the return spring, hammering the graphite powder, thereby further improving the crushing effect of the graphite powder and facilitating the overflow of the gasified impurities produced by purification.

[0017] Finally, the crushed graphite powder enters the interior of the guide tube, and at the same time, the combustible gas synchronously enters the interior of the fixed tube, the plasma spray gun assembly and the connecting tube 2, and the driving force of the combustible gas entering is used to drive the rotating blades to rotate, so that the rotating tube 2 and the drive motor move in the opposite direction. At the same time, the combustible gas is introduced into the interior of the spray gun tube through the spray gun tube mouth, and the plasma flame is sprayed into the spray gun head 1 to remove impurities from the crushed graphite powder again. The crushed graphite powder is heated by the plasma flame to improve the effect of uniform heating of the graphite powder raw material and prevent uneven heating of the graphite powder raw material. At the same time, during the rotation of the rotating tube 2, the spray gun tube rotates synchronously to break up the crushed graphite powder raw material and further improve the uniformity of heating of the graphite powder raw material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings that constitute part of this application are used to provide a further understanding of this application and make other features, objects and advantages of this application more apparent. The illustrative embodiment drawings of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0019] Figure 1 It is a schematic structural diagram of the purification furnace body of the present invention.

[0020] Figure 2 It is a schematic diagram of the internal structure of the purification furnace body of the present invention.

[0021] Figure 3yes Figure 2 Enlarged structural diagram at point A in the middle.

[0022] Figure 4 It is a schematic diagram of the internal component structure of the purification furnace body of the present invention.

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the internal components of the purification furnace body of the present invention.

[0024] Figure 6 yes Figure 5 Enlarged structural diagram at point B in the middle.

[0025] Figure 7 It is a schematic structural diagram of the plasma spray gun assembly of the present invention.

[0026] Figure 8 It is a schematic diagram of the cross-sectional structure of the hollow spiral conveying blade, conical disk and rolling cylinder of the present invention.

[0027] Figure 9 It is a schematic diagram of the cross-sectional structure of the rolling drum of the present invention.

[0028] In the above figure, 100, purification furnace body; 101, discharge pipe; 102, water injection pipe; 103, connecting pipe 1; 104, inlet pipe; 105, air inlet pipe; 106, cooling chamber; 200, driving motor; 300, driving rod; 301, bearing 1; 302, fixing rod 1; 303, cross-shaped fixing plate 1; 304, fixing sleeve; 400, rotating tube 1; 401, rotating rod; 402, stirring rod; 403, fixing tube; 404, cross-shaped fixing plate 2; 405, fixing Fixed rod 2; 406, spray gun head 1; 407, spray gun tube; 408, rotating tube 2; 409, connecting tube 2; 410, bearing 2; 411, spray gun tube mouth; 412, rotating blade; 500, hollow spiral conveying blade; 501, spray gun head 2; 600, conical disk; 601, inverted conical disk; 602, telescopic block; 603, rolling roller; 604, built-in groove; 605, return spring; 700, rolling cylinder; 701, material guide tube; 702, baffle; 800, mixing cylinder. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described 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, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate to describe the embodiments of the present application here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0032] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0033] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] See also Figures 1-9As shown, this embodiment provides a high-temperature purification processing device for graphite powder, a raw material for negative electrodes of lithium-ion batteries, comprising a purification furnace body 100, wherein the top and bottom of the purification furnace body 100 are respectively connected to an inlet pipe 104 and an outlet pipe 101, and the interior of the purification furnace body 100 is rotatably connected to a rotating tube 1 400, and the outer side of the rotating tube 1 400 is wound with a hollow spiral conveying blade 500, and the interior of the rotating tube 1 400 is connected to the interior of the hollow spiral conveying blade 500 through a through hole;

[0036] The bottom end of the rotating tube 400 is fixedly connected to a conical disk 600, and an inverted conical disk 601 is fixedly connected to the bottom end of the conical disk 600. Built-in grooves 604 are evenly spaced on the inclined surface of the inverted conical disk 601, and telescopic blocks 602 are slidably connected inside the built-in grooves 604. The telescopic blocks 602 are connected to the inner ends of the built-in grooves 604 via return springs 605. A rolling roller 603 is rotatably connected to the inclined surface of the outer side of the telescopic blocks 602.

[0037] A rolling cylinder 700 is fixedly connected to the interior of the purification furnace body 100 outside the conical disk 600 and the inverted conical disk 601, and a material guide pipe 701 is fixedly connected to the middle position of the bottom end of the rolling cylinder 700;

[0038] The guide tube 701 at the bottom end of the inverted conical disk 601 is fixedly connected to the inside of the fixing tube 403, and two groups of plasma spray gun assemblies are rotatably connected to the bottom end of the fixing tube 403 at equal intervals along its axial direction, and the two groups of plasma spray gun assemblies are connected by a second connecting tube 409, and a rotating rod 401 is fixedly connected to the middle position of the bottom of the plasma spray gun assembly at the bottom end, and stirring rods 402 are distributed at equal intervals along the upper axial direction of the rotating rod 401. A second cross-shaped fixing plate 404 is fixed to the inside of the fixing tube 403 and the second connecting tube 409, and the second cross-shaped fixing plate 404 and the rotating rod 401 are connected by a second fixing rod 405.

[0039] In this embodiment, a driving motor 200 is installed at the top of the purification furnace body 100, and a driving rod 300 is connected to the output end of the driving motor 200, and a fixing sleeve 304 is fixed at the connection between the driving rod 300 and the rotating tube 1 400, and a bearing 1 301 corresponding to the bottom end of the driving rod 300 and the top end of the rotating tube 1 400 is symmetrically installed inside the fixing sleeve 304, the bottom end of the driving rod 300 is fixedly connected to a fixing rod 1 302, and a fixing rod 1 302 is fixed to the top end of the rotating tube 1 400. The cross-shaped fixing plate 103 is connected to the end of the rod 302, and the outer side of the fixing sleeve 304 between the driving rod 300 and the rotating tube 1 400 is connected to the air intake pipe 105. When in use, the driving motor 200 drives the driving rod 300 to rotate, and the fixing rod 302 and the cross-shaped fixing plate 103 are used to fix the driving rod 300 and the rotating tube 1 400, thereby driving the rotating tube 1 400 to rotate, and at the same time, the combustible gas is introduced through the air intake pipe 105 and enters the interior of the rotating tube 1 400.

[0040] In this embodiment, the hollow spiral conveying blade 500 is equipped with a second spray gun head 501 at equal intervals along its spiral path. When in use, the second spray gun head 501 is used to spray a plasma flame to preheat the graphite powder entering the purification furnace body 100, thereby improving the dryness of the graphite powder and improving the impurity removal effect.

[0041] In this embodiment, the plasma spray gun assembly includes a symmetrically arranged bearing 2 410, and the two bearings 2 410 are connected by a rotating tube 2 408, and the inner wall of the rotating tube 2 408 is fixed with rotating blades 412 at equal intervals along its circumferential direction. The rotating tube 2 408 between two adjacent rotating blades 412 is provided with a spray gun nozzle 411, and the position of the spray gun nozzle 411 is connected to the spray gun tube 407, and the spray gun head 1 406 is installed on the spray gun tube 407. When in use, the combustible gas enters the interior of the fixed tube 403, the plasma spray gun assembly and the connecting tube 2 409, and the combustible gas enters The driving force drives the rotating blades 412 to rotate, so that the rotating tube 408 and the driving motor 200 move in the opposite direction. At the same time, the combustible gas is introduced into the interior of the spray gun tube 407 through the spray gun nozzle 411, and sprayed into the plasma flame through the spray gun head 406, so as to remove impurities from the crushed graphite powder again. The crushed graphite powder is heated by the plasma flame to improve the effect of uniform heating of the graphite powder raw material and prevent the graphite powder raw material from being heated unevenly. At the same time, during the rotation of the rotating tube 408, the spray gun tube 407 rotates synchronously to break up the crushed graphite powder raw material and further improve the uniformity of heating of the graphite powder raw material.

[0042] In this embodiment, a stirring drum 800 connected to the bottom end of the guide tube 701 is fixed inside the purification furnace body 100 at the position of the rotating rod 401. A cooling chamber 106 is formed between the outer wall of the stirring drum 800 and the inner wall of the purification furnace body 100, and a water injection pipe 102 connected to the cooling chamber 106 is opened on the purification furnace body 100. When in use, cooling water is injected into the cooling chamber 106 through the water injection pipe 102. Under the dual effects of stirring and cooling water, the overflow effect of gasified impurities is further improved, thereby improving the purification effect.

[0043] In this embodiment, the upper part of the purification furnace body 100 is connected to a connecting pipe 103 that is in communication with the purification furnace body 100. When in use, the air in the purification furnace body 100 is extracted through the connecting pipe 103, and then the inert gas is injected into the interior of the purification furnace body 100 again through the connecting pipe 103, so that the normal air pressure in the purification furnace body 100 is restored.

[0044] In this embodiment, the inner inclined surface of the rolling drum 700 is fixed with baffles 702 at equal intervals. When in use, the telescopic block 602 and the rolling roller 603 cooperate with the baffles 702. Therefore, during the rotation of the inverted conical disk 601, when the telescopic block 602 and the rolling roller 603 rub against the baffles 702, the side surfaces of the telescopic block 602 and the rolling roller 603 and the baffles 702 are used to squeeze the graphite powder, thereby improving the crushing effect of the graphite powder. When the roller 603 slides along the inside of the built-in groove 604 and the reset spring 605 is squeezed, the telescopic block 602 and the rolling roller 603 are blocked by the baffle 702 and shrink, and are above the baffle 702. Then, during the rotation process, when the telescopic block 602 and the rolling roller 603 are separated from the baffle 702, the telescopic block 602 and the rolling roller 603 are suddenly popped out under the action of the reset spring 605, hammering the graphite powder, thereby further improving the crushing effect of the graphite powder and facilitating the overflow of the gasified impurities produced by purification.

[0045] In summary:

[0046] Before purifying the graphite powder, the air in the purification furnace body 100 is first extracted through the connecting pipe 103, and then the inert gas is injected into the interior of the purification furnace body 100 through the connecting pipe 103 to restore the air pressure in the purification furnace body 100 to normal. Then, the graphite powder is injected into the interior of the purification furnace body 100 through the inlet pipe 104.

[0047] Then, the driving motor 200 drives the driving rod 300 to rotate, and the fixing rod 302 and the cross-shaped fixing plate 303 are used to fix the driving rod 300 and the rotating tube 400, thereby driving the rotating tube 400 to rotate. At the same time, the combustible gas is introduced through the air inlet pipe 105 and enters the interior of the rotating tube 400. During the rotation of the rotating tube 400, the hollow spiral conveying blade 500 is driven to rotate, thereby conveying the graphite powder entering the interior of the purification furnace body 100. During the process of conveying by the hollow spiral conveying blade 500, since the interior of the hollow spiral conveying blade 500 is a hollow structure, and the rotating tube 1 400 is connected to the hollow cavity inside the hollow spiral conveying blade 500 through the through hole, the combustible gas enters the hollow cavity inside the hollow spiral conveying blade 500, and then the plasma flame is sprayed by the second spray gun head 501, thereby preheating the graphite powder entering the purification furnace body 100, thereby improving the dryness of the graphite powder and improving the impurity removal effect;

[0048] Then the graphite powder is transported to the conical disk 600, and the inclined surface of the conical disk 600 is used to slide the graphite powder into the interior of the grinding cylinder 700, thereby driving the conical disk 600 and the inverted conical disk 601 to rotate under the rotation of 400. During the rotation of the inverted conical disk 601, the graphite powder entering the interior of the grinding cylinder 700 is ground, so as to facilitate the crushing of the agglomerated graphite powder. It is explained here that in the process of preheating by the spray gun head 2 501 mentioned above, it is convenient to remove the moisture in the graphite powder, so as to prevent the presence of moisture in the graphite powder during the grinding process, which causes the ground graphite powder to be in the form of cakes and stick to each other. In the process of grinding the graphite powder, the telescopic block 602 and the grinding roller 603 cooperate with the baffle 702. Therefore, during the rotation of the inverted conical disk 601, When the telescopic block 602 and the rolling roller 603 rub against each other with the stop bar 702, the telescopic block 602 and the rolling roller 603 are used to squeeze the graphite powder with the side surfaces of the stop bar 702, thereby improving the crushing effect of the graphite powder; when the telescopic block 602 and the rolling roller 603 slide along the inside of the built-in groove 604, the return spring 605 is squeezed, and at this time, the telescopic block 602 and the rolling roller 603 are blocked by the stop bar 702 and retract, and are located above the stop bar 702; then, during the rotation process, when the telescopic block 602 and the rolling roller 603 are separated from the stop bar 702, the telescopic block 602 and the rolling roller 603 are suddenly ejected under the action of the return spring 605, hammering the graphite powder, thereby further improving the crushing effect of the graphite powder, and facilitating the overflow of the gasified impurities produced by purification;

[0049] Subsequently, the pulverized graphite powder enters the interior of the guide tube 701, and at the same time, the combustible gas synchronously enters the interior of the fixed tube 403, the plasma spray gun assembly and the second connecting tube 409, and the driving force of the combustible gas is used to drive the rotating blade 412 to rotate, so that the rotating tube 408 and the driving motor 200 move in the opposite direction. At the same time, the combustible gas is introduced into the interior of the spray gun tube 407 through the spray gun nozzle 411, and sprayed into the plasma flame through the spray gun head 406, so as to remove impurities from the pulverized graphite powder again, and the pulverized graphite powder is heated by the plasma flame to improve the effect of uniform heating of the graphite powder raw material, thereby preventing the graphite powder raw material from being heated unevenly. At the same time, during the rotation of the rotating tube 408, the spray gun tube 407 rotates synchronously, thereby breaking up the pulverized graphite powder raw material, further improving the uniformity of heating of the graphite powder raw material.

[0050] Then the graphite powder raw material enters the mixing drum 800 and is fixedly connected to the rotating rod 401 through the cross-shaped fixed plate 2 404 and the fixed rod 2 405. Therefore, the rotating tube 1 400 synchronously drives the rotating rod 401 and the stirring rod 402 to rotate, thereby stirring the graphite powder raw material entering the mixing drum 800, thereby accelerating the dissipation of heat from the heated graphite powder raw material and improving the overflow of gasified impurities. Subsequently, the purified graphite powder raw material is discharged through the discharge pipe 101. During the stirring process of the graphite powder raw material, cooling water is simultaneously injected into the cooling chamber 106 through the water injection pipe 102. Under the dual effects of stirring and cooling water, the overflow effect of gasified impurities is further improved, thereby improving the purification effect.

Claims

1. A high-temperature purification treatment device for graphite powder as a raw material for negative electrodes of lithium-ion batteries, comprising a purification furnace body (100), wherein: The top and bottom of the purification furnace body (100) are respectively connected to an inlet pipe (104) and an outlet pipe (101), and the purification furnace body (100) is characterized in that the interior of the purification furnace body (100) is rotatably connected to a rotating tube (400), and the outer side of the rotating tube (400) is wound with a hollow spiral conveying blade (500), and the interior of the rotating tube (400) and the interior of the hollow spiral conveying blade (500) are connected through a through hole; The bottom end of the rotating tube (400) is fixedly connected to a conical disk (600), and the bottom end of the conical disk (600) is fixedly connected to an inverted conical disk (601); A rolling cylinder (700) is fixedly connected to the interior of the purification furnace body (100) outside the conical disk (600) and the inverted conical disk (601), and a material guide pipe (701) is fixedly connected to the middle position of the bottom end of the rolling cylinder (700); The guide tube (701) at the bottom end of the inverted conical disk (601) is fixedly connected to a fixed tube (403) inside, and two groups of plasma spray gun assemblies are rotatably connected at equal intervals along the axial direction of the bottom end of the fixed tube (403), and the two groups of plasma spray gun assemblies are connected via a second connecting tube (409), and a rotating rod (401) is fixedly connected at the middle position of the bottom of the plasma spray gun assembly at the bottom end, and stirring rods (402) are distributed at equal intervals along the axial direction of the rotating rod (401).

2. The high-temperature purification device for graphite powder as a raw material for the negative electrode of a lithium-ion battery according to claim 1, characterized in that: A driving motor (200) is installed at the top of the purification furnace body (100), and a driving rod (300) is connected to the output end of the driving motor (200), and a fixing sleeve (304) is fixed at the connection between the driving rod (300) and the rotating tube (400), and a bearing (301) corresponding to the bottom end of the driving rod (300) and the top end of the rotating tube (400) is symmetrically installed inside the fixing sleeve (304), the bottom end of the driving rod (300) is fixedly connected to the fixing rod (302), and a cross-shaped fixing plate (303) connected to the end of the fixing rod (302) is fixed at the top end of the rotating tube (400), and an air inlet pipe (105) is connected to the outside of the fixing sleeve (304) between the driving rod (300) and the rotating tube (400).

3. The high-temperature purification device for graphite powder as a raw material for the negative electrode of a lithium-ion battery according to claim 1, characterized in that: Spray gun heads (501) are mounted on the hollow spiral conveying blade (500) at equal intervals along its spiral path.

4. The high-temperature purification device for graphite powder as a raw material for negative electrode of lithium-ion batteries according to claim 1, characterized in that: The plasma spray gun assembly includes two symmetrically arranged bearings (410), and the two bearings (410) are connected by a rotating tube (408), and the inner wall of the rotating tube (408) is fixed with rotating blades (412) at equal intervals along its circumferential direction. A spray gun nozzle (411) is opened on the rotating tube (408) between two adjacent rotating blades (412), and a spray gun pipe (407) is connected to the position of the spray gun pipe nozzle (411), and a spray gun head (406) is installed on the spray gun pipe (407).

5. The high-temperature purification device for graphite powder as a raw material for negative electrode of lithium-ion batteries according to claim 1, characterized in that: A stirring drum (800) connected to the bottom end of the material guide tube (701) is fixed inside the purification furnace body (100) at the position of the rotating rod (401), and a cooling chamber (106) is formed between the outer wall of the stirring drum (800) and the inner wall of the purification furnace body (100), and a water injection pipe (102) connected to the cooling chamber (106) is opened on the purification furnace body (100).

6. The high-temperature purification device for graphite powder as a raw material for negative electrode of lithium-ion batteries according to claim 1, characterized in that: The upper portion of the purification furnace body (100) is connected to a connecting pipe 1 (103) that is in communication with the purification furnace body (100).

7. The high-temperature purification device for graphite powder as a raw material for negative electrode of lithium-ion batteries according to claim 1, characterized in that: Baffles (702) are fixed at equal intervals on the inclined surface inside the rolling cylinder (700).

8. The high-temperature purification device for graphite powder as a raw material for negative electrode of lithium-ion batteries according to claim 1, characterized in that: Built-in grooves (604) are provided at equal intervals on the inclined surface of the inverted conical disk (601), and telescopic blocks (602) are slidably connected inside the built-in grooves (604).

9. The high-temperature purification device for graphite powder as a raw material for negative electrode of lithium-ion batteries according to claim 8, characterized in that: The telescopic block (602) is connected to the inner end of the built-in groove (604) via a return spring (605), and a rolling roller (603) is rotatably connected to the inclined surface outside the telescopic block (602).

10. The high-temperature purification device for graphite powder as a raw material for negative electrode of lithium-ion batteries according to claim 1, characterized in that: A second cross-shaped fixing plate (404) is fixed inside the fixing tube (403) and the second connecting tube (409), and the second cross-shaped fixing plate (404) and the rotating rod (401) are connected via a second fixing rod (405).

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