Continuous graphitization furnace for high-quality regeneration of waste graphite

Abstract

The utility model provides a continuous graphitization furnace for high-quality regeneration of waste graphite, which is characterized in that a plurality of movable baffle plate mechanisms are arranged along a vertical furnace body at intervals from top to bottom, and each movable baffle plate mechanism comprises a movable baffle plate and an in-furnace baffle plate; the in-furnace baffle plate is arranged in the vertical furnace body and is rotatably connected to the side edge of the movable baffle plate through a pin shaft made of a graphite material; the movable baffle penetrates through the furnace wall of the vertical furnace body and is movably arranged on the furnace wall in the horizontal direction. When entering the furnace body to be graphitized, the material flows along the in-furnace baffle in the furnace body and then moves downwards under the action of the in-furnace baffle erected by the graphite pins in the furnace body. And the movable baffle plate mechanism prolongs the retention time of the material in the furnace body, so that the material can be fully graphitized in the furnace body.

Description

TECHNICAL FIELD

[0001] The utility model relates to graphite material manufacturing technical field especially is related to a continuous graphitization furnace for high-quality regeneration of waste graphite. BACKGROUND

[0002] With the wide application of lithium ion batteries in the field of power batteries and consumer electronic batteries, the demand for graphite negative electrode material industry has increased sharply. The traditional graphitization process uses Acheson furnace, internal string type furnace, vacuum furnace, box type furnace and the like for graphitization. These traditional intermittent graphitization furnaces have many defects such as high production energy consumption, long production cycle and poor production environment, although they have simple structure.

[0003] CN211626044U patent discloses a continuous graphitization furnace, including graphitization treatment furnace, the graphitization treatment furnace has the furnace hearth with import and export, the import of furnace hearth is connected with feed gas replacement device, feed gas replacement device includes feed replacement bin and first gas replacement assembly for replacing gas in feed replacement bin, feed replacement bin is equipped with feed port, discharge port, first valve for controlling feed replacement bin feed port opening and closing and second valve for controlling feed replacement bin discharge port opening and closing, feed replacement bin discharge port is connected with the import of furnace hearth. The continuous graphitization furnace can reduce the influence of harmful gas on material graphitization, improve product quality, and can continuously graphitize the material.

[0004] Although the above patent document mentions that the import and export of the continuous graphitization furnace are equipped with gas replacement devices to ensure sealing, reduce the influence of other gases on material graphitization, and improve product quality. But its furnace hearth is a through channel from top to bottom, and the material moves in the furnace body by gravity, which may cause the material to stay in the furnace for too short a time, and the prepared product has low graphitization rate.

[0005] Therefore, it is necessary to propose a new structure in the continuous graphitization furnace for high-quality regeneration of waste graphite, to solve the above problems. INVENTION CONTENTS

[0006] The utility model aims at solving at least one defect existing in prior art, provides a kind of automatic, efficient, stable continuous graphitization furnace for high-quality regeneration of waste graphite, and the graphitization furnace can control the graphitization time of material in furnace body, guarantee that material can be fully graphitized, to improve the quality of graphitized product.

[0007] The utility model provides a kind of continuous graphitization furnace for high-quality regeneration of waste graphite, comprising:

[0008] Vertical furnace body with cavity in it;

[0009] Feeding mechanism and exhaust duct connected with the top of vertical furnace body.

[0010] An induction coil is arranged in the vertical furnace body and extends upward from the bottom of the vertical furnace body, a core of the induction coil is provided with a crucible group composed of a plurality of coaxial vertically stacked bottomless crucibles, and a heat preservation layer is arranged between the crucible group and the induction coil;

[0011] A plurality of movable baffle mechanisms are arranged in the vertical furnace body in a spaced manner from top to bottom, each movable baffle mechanism comprises a movable baffle and an inner furnace baffle, the inner furnace baffle is arranged inside the vertical furnace body and rotatably connected to a side edge of the movable baffle through a graphite pin shaft, the movable baffle passes through a furnace wall of the vertical furnace body and is movably arranged on the furnace wall in a horizontal direction;

[0012] A cooler is connected to a discharge port at a bottom end of the vertical furnace body;

[0013] A discharge mechanism is arranged below the cooler.

[0014] Preferably, an opening is formed in the furnace wall, the movable baffle is movably arranged on the opening, and a corresponding airtight assembly is arranged at the opening.

[0015] Preferably, two adjacent movable baffle mechanisms in a vertical direction are arranged in an overlapping manner in a circumferential direction of the vertical furnace body.

[0016] Preferably, two adjacent movable baffle mechanisms in a vertical direction are arranged in a 180-degree angle relative manner in a circumferential direction of the vertical furnace body.

[0017] Preferably, two adjacent movable baffle mechanisms in a vertical direction are arranged in a 90-degree angle relative manner in a circumferential direction of the vertical furnace body.

[0018] Preferably, the vertical furnace body further comprises an inert gas pipe for providing a protective atmosphere, which is in communication with the cavity.

[0019] Preferably, the feeding mechanism comprises, in sequence, a vacuum feeder, a feed temporary storage bin connected to a discharge port of the vacuum feeder, a feed screw feeder connected to an outlet of the feed temporary storage bin, and a planetary feeder connected to an outlet of the feed screw feeder, and the outlet of the planetary feeder is in communication with a feed port at a top of the vertical furnace body.

[0020] Preferably, a heat preservation jacket graphite lining discharge temporary storage bin is connected between the discharge port at the bottom end of the vertical furnace body and the cooler.

[0021] Preferably, the cooler comprises a water-cooled jacket screw feeder and a sealed rotary cooling kiln connected in sequence; a circulating water tank is connected with the water-cooled jacket screw feeder and the sealed rotary cooling kiln to provide a cooling water source; the sealed rotary cooling kiln comprises a material conveying pipe and a spray head connected with the circulating water tank, and the spray head is used for cooling the outer wall of the material conveying pipe.

[0022] Preferably, the exhaust pipe is communicated with the tail gas purification device and the air extraction device.

[0023] In the technical scheme, a plurality of movable baffle mechanisms are arranged at intervals from top to bottom along the vertical furnace body, each movable baffle mechanism comprises a movable baffle and an inner furnace baffle, the inner furnace baffle is arranged inside the vertical furnace body and rotatably connected to the side of the movable baffle through a graphite pin shaft, the movable baffle passes through the furnace wall of the vertical furnace body and is movably arranged on the furnace wall in the horizontal direction; when the material enters the furnace body for graphitization, the material is affected by the inner furnace baffle which is supported by the graphite pin in the furnace body, and moves downward after flowing along the inner furnace baffle in the furnace body. The movable baffle mechanism prolongs the residence time of the material in the furnace body, thereby ensuring that the material can be fully graphitized in the furnace body. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the application, the illustrative embodiments of the present application and the explanations thereof serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 is a structural schematic view of a continuous graphitization furnace for high-quality regeneration of waste graphite in an embodiment of the present application

[0026] Figure 2 is Figure 1 is a structural schematic view of a movable baffle mechanism of the continuous graphitization furnace for high-quality regeneration of waste graphite in

[0027] Figure 3 is Figure 2 is an enlarged schematic view of another angle of the movable baffle mechanism in

[0028] Figure 4 is Figure 1 is a structural schematic view of a heat-insulating sandwich graphite inner lining discharge temporary storage bin of the continuous graphitization furnace for high-quality regeneration of waste graphite in DETAILED DESCRIPTION

[0029] In order to better explain the present application, the present application is described in detail below with reference to the drawings, and through specific embodiments.

[0030] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture as shown in the drawings, and if the specific posture changes, the directionality indications will also change accordingly.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integrated; "connection" can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] As Figures 1-4 The continuous graphitization furnace 100 for high-quality regeneration of waste graphite, as shown, comprises:

[0033] A vertical furnace body 5 with a cavity 51 inside;

[0034] A feeding mechanism 10 and an exhaust duct 151 connected to the top of the vertical furnace body 5;

[0035] An induction coil 7 arranged inside the vertical furnace body 5 and extending upward from the bottom of the vertical furnace body 5, the core of the induction coil 7 is provided with a crucible group (not shown in the figure) composed of a plurality of coaxial vertical stacked bottomless crucibles, and a heat preservation layer 8 is arranged between the crucible group and the induction coil 7;

[0036] A plurality of movable baffle mechanisms 6 are arranged at intervals from top to bottom along the vertical furnace body 5, each movable baffle 6 comprises a movable baffle 61 and an inner furnace baffle 63, the inner furnace baffle 63 is arranged inside the vertical furnace body 5 and rotatably connected to the side of the movable baffle 61 through a pin shaft 62 made of graphite material; the movable baffle 61 passes through the furnace wall of the vertical furnace body 5 and is movably arranged in the horizontal direction on the furnace wall;

[0037] A cooler connected to the discharge port at the bottom end of the vertical furnace body 5;

[0038] A discharge mechanism 12 arranged below the cooler.

[0039] The technical scheme provided by the utility model discloses, through setting up a plurality of movable baffle mechanisms 6 that are arranged at intervals from top to bottom along the vertical furnace body 5, each movable baffle mechanism 6 comprises a movable baffle 61 and an inner furnace baffle 63, the inner furnace baffle 63 is arranged inside the vertical furnace body 5 and rotatably connected to the side of the movable baffle 61 through a graphite pin shaft 62, the movable baffle 61 passes through the furnace wall of the vertical furnace body 5 and is movably arranged on the furnace wall in the horizontal direction.

[0040] The movable baffle mechanism 6 is connected by two baffles through a graphite pin 62. One movable baffle 61 is inserted in the furnace wall, and the other inner furnace baffle 63 is fixed in the furnace by the fixed graphite pin 62 in the furnace, so that it has a certain inclination angle with the horizontal plane, facilitating the movement of the material in the baffle by gravity. In the baffle mechanism 6, the movable baffle 61 has only one degree of freedom of horizontal movement; the inner furnace baffle 63 has only one degree of freedom of rotation around the inner furnace fixed graphite pin. The inner furnace graphite pin that fixes the inner furnace baffle 63 is used as a fulcrum of the inner furnace baffle movement, and the inclination angle of the inner furnace baffle 63 can be changed by moving the movable baffle 61 horizontally. Pushing the movable baffle 61 into the furnace can increase the inclination angle of the inner furnace baffle 63, and vice versa, which can change the inclination angle range of the inner furnace baffle to 20°-40°.

[0041] When the material enters the furnace body for graphitization, the material is affected by the effect of the inner furnace baffle 63 supported by the graphite pin in the furnace body, and moves downward after flowing along the inner furnace baffle 63 in the furnace body. The movable baffle mechanism 6 prolongs the residence time of the material in the furnace body, thereby ensuring that the material can be fully graphitized in the furnace body.

[0042] Preferably, an opening is formed in the furnace wall, the movable baffle 61 is movably arranged on the opening, and a corresponding air-tight assembly is arranged at the opening. The air-tight assembly can be a sealing ring, an asbestos shielding assembly, etc., as long as it can ensure the air tightness of the graphite furnace to a certain extent, and does not need to be completely sealed.

[0043] Preferably, two adjacent movable baffle mechanisms in the vertical direction are arranged in the circumferential direction of the vertical furnace body.

[0044] Preferably, two adjacent movable baffle mechanisms in the vertical direction are arranged at an angle of 180 degrees in the circumferential direction of the vertical furnace body.

[0045] Preferably, two adjacent movable baffle mechanisms in the vertical direction are arranged at an angle of 90 degrees in the circumferential direction of the vertical furnace body.

[0046] Specifically, in the embodiment, two adjacent movable baffle mechanisms 6 in the vertical direction are arranged opposite to each other at an angle of 180 degrees in the circumferential direction of the vertical furnace body. It can also be described that two adjacent movable baffle mechanisms in the vertical direction are arranged opposite to each other relative to the axis of the vertical furnace body 5 in the horizontal direction. In this embodiment, the material moves left and right reciprocatingly downward under the action of the furnace baffle 63 and gravity.

[0047] The position of the opening on the furnace wall determines the direction of the movable baffle mechanism 6, for example, the openings can be alternately arranged from top to bottom, or can be arranged from top to bottom at intervals of 90 degrees, 120 degrees, etc. Thus, different falling effects of the material in the furnace are formed.

[0048] Preferably, it further comprises an inert gas pipe (not shown in the figure) for providing a protective atmosphere, which communicates with the cavity 51.

[0049] Preferably, the feeding mechanism 10 sequentially comprises a vacuum feeder 1, a feed temporary storage bin 2 connected to the discharge port of the vacuum feeder 1, a feed screw feeder 3 connected to the outlet of the feed temporary storage bin 2, and a planetary feeder 4 connected to the outlet of the feed screw feeder 3, and the outlet of the planetary feeder 4 communicates with the feed port at the top of the vertical furnace body 5.

[0050] Preferably, a heat preservation jacket graphite lining discharge temporary storage bin 9 is connected between the discharge port at the bottom end of the vertical furnace body 5 and the cooler. The heat preservation jacket graphite lining discharge temporary storage bin 9 is composed of a high-temperature-resistant graphite lining 92 and a carbon fiber hard felt 91 having a heat insulation effect.

[0051] Preferably, the cooler comprises a water-cooled jacket screw feeder 10 and a sealed rotary cooling kiln 13 connected in sequence; a circulating water tank 11 is connected to the water-cooled jacket screw feeder 10 and the sealed rotary cooling kiln 13 to provide a cooling water source; the sealed rotary cooling kiln 13 comprises a material conveying pipe 142 and a spray head 14 connected to the circulating water tank, which is used to cool the outer wall of the material conveying pipe 142. The water-cooled jacket screw feeder 10 and the sealed rotary cooling kiln 13 cool the material by circulating water in the circulating water tank 11, and the sealed rotary cooling kiln 13 cools and cools the material by spraying.

[0052] Preferably, the exhaust pipe 151 is connected to an exhaust gas purification device 17 and an exhaust device 16. The purification device 15 in the exhaust system is composed of filter elements of different materials (such as activated carbon, iron oxide, zinc oxide, etc.), which can adsorb sulfides and acidic gases in the exhaust gas. The exhaust device 16 can be a Roots blower, a centrifugal fan or a suspended fan, etc., which can exhaust the exhaust gas generated in the graphitization process from the top of the furnace.

[0053] The continuous graphitization furnace for high-quality regeneration of waste graphite is particularly suitable for waste graphite materials, the materials are heated by eddy current generated by the electromagnetic induction coil wound outside the graphitization furnace, the highest temperature can reach 3200 DEG C, the high-temperature materials after graphitization first flow into the temporary storage bin with the heat preservation jacket graphite lining, and then are conveyed to the sealed rotary cooling kiln through the water-cooled jacket screw feeder to be further cooled to below 70 DEG C. Finally, the cooled graphite products are subjected to the next step of processing.

[0054] There are a plurality of movable baffle structures 6 in the furnace. The movable baffle structure 6 controls the residence time of the materials in the furnace, so that the materials can stay in the graphitization furnace for as long as possible to improve the graphitization quality of the products.

[0055] The graphite powder products prepared by the continuous graphitization furnace are first subjected to first-order cooling by the water-cooled jacket screw feeder 10, and then the high-temperature graphite powder is conveyed to the sealed rotary cooling kiln 13 for second-order cooling to below 70 DEG C. The sealing prevents the graphite materials that have not been completely cooled from being oxidized and burned due to high temperature and oxygen. The sealed rotary cooling kiln 13 has a similar water-cooling principle as the water-cooled jacket, and is cooled by water in the circulating water tank 11 through water bath cooling by the spraying structure on the kiln top.

[0056] The tail gas generated by the continuous graphitization furnace is first subjected to purification treatment such as desulfurization and impurity removal by the purification device 17, and then is discharged by the air extraction device 16. The first purification is to meet the national emission standard and protect the environment. The air extraction device is added to ensure that the flue gas in the furnace body can be discharged in time, prevent the pressure in the furnace from being too high, and further ensure the safety of the continuous graphitization furnace.

[0057] The utility model is not limited to the above preferred implementation, and can be transformed and improved in various forms within the spirit of the utility model claim and specification, can solve the same technical problem, and achieve the expected technical effect, so it is not repeated. All the schemes that can be directly or intuitively conceived by those skilled in the art from the disclosed content of the utility model belong to the protection scope of the utility model as long as they are within the spirit of the claim.

Claims

1. A continuous graphitization furnace for high-quality recycling of waste graphite, characterized in that, The utility model relates to a vertical furnace body with a cavity in the interior, a feeding mechanism and an exhaust pipeline connected to the top of the vertical furnace body, an induction coil arranged in the vertical furnace body and extending upward from the bottom of the vertical furnace body, wherein the core of the induction coil is provided with a crucible group composed of a plurality of coaxial vertically stacked bottomless crucibles, and a heat preservation layer is arranged between the crucible group and the induction coil, a plurality of movable baffle mechanisms are arranged in the vertical furnace body from top to bottom, each movable baffle mechanism comprises a movable baffle and an inner furnace baffle, the inner furnace baffle is arranged in the interior of the vertical furnace body and rotatably connected to the side edge of the movable baffle through a graphite pin shaft, the movable baffle penetrates the furnace wall of the vertical furnace body and is movably arranged on the furnace wall in the horizontal direction, a cooler is connected to the discharge port at the bottom end of the vertical furnace body, and a discharge mechanism is arranged below the cooler. An opening is formed in the furnace wall, the movable baffle is movably arranged on the opening, and a corresponding airtight assembly is arranged at the opening. Two adjacent movable baffle mechanisms in the vertical direction are arranged in the circumferential direction of the vertical furnace body in an overlapping manner. Two adjacent movable baffle mechanisms in the vertical direction are arranged in the circumferential direction of the vertical furnace body at an angle of 180 degrees. Two adjacent movable baffle mechanisms in the vertical direction are arranged in the circumferential direction of the vertical furnace body at an angle of 90 degrees. Further comprising: An inert gas pipe for providing a protective atmosphere in communication with the cavity.

2. The continuous graphitization furnace for recycling of waste high-quality graphite according to claim 1, characterized by The feeding mechanism comprises a vacuum feeder, a feed temporary storage bin connected to the discharge port of the vacuum feeder, a feed screw feeder connected to the outlet of the feed temporary storage bin, and a planetary feeder connected to the outlet of the feed screw feeder, wherein the outlet of the planetary feeder is in communication with the feed inlet at the top of the vertical furnace body.

3. The continuous graphitization furnace for recycling of waste graphite high quality according to claim 1, characterized in that, A heat preservation jacket graphite lining discharge temporary storage bin is connected between the discharge port at the bottom end of the vertical furnace body and the cooler.

4. The continuous graphitization furnace for recycling of waste graphite high quality according to claim 3, characterized by The cooler comprises a water-cooled jacket screw feeder and a sealed rotary cooling kiln connected in sequence, a circulating water tank is connected to the water-cooled jacket screw feeder and the sealed rotary cooling kiln to provide a cooling water source, and the sealed rotary cooling kiln comprises a material conveying pipe and a spray head connected to the circulating water tank, wherein the spray head is used for cooling the outer wall of the material conveying pipe.

5. The continuous graphitization furnace for recycling of waste graphite high quality according to claim 3, characterized in that, The exhaust pipeline is in communication with a tail gas purification device and a gas extraction device.

6. The continuous graphitization furnace for recycling of waste graphite high quality according to claim 1, characterized in that, ​ ​ 7. The continuous graphitization furnace for recycling of waste graphite high quality according to claim 1, characterized in that, ​ 8. The continuous graphitization furnace for recycling of waste graphite high quality according to claim 1, characterized in that, ​ 9. The continuous graphitization furnace for recycling of waste graphite high quality according to claim 1, characterized in that, ​ 10. The continuous graphitization furnace for recycling of waste graphite high quality according to claim 1, characterized in that, ​

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