A graphite purification method and rotary high-temperature carbon tube furnace

Abstract

The present invention relates to the technical field of graphite purification, and in particular to a graphite purification method and a rotary high-temperature carbon tube furnace. The graphite purification method comprises assembling a rotary high-temperature carbon tube furnace; mixing graphite powder and flux in a required mass ratio and then loading the mixture into a graphite boat; providing a carbon black filling layer between the inner wall of the furnace body and the outer wall of the carbon tube; and purifying graphite at high temperature. The rotary high-temperature carbon tube furnace comprises a furnace body, carbon tubes, a heating assembly, and a double rocker mechanism; the carbon tubes are arranged throughout the furnace body; a feed port is provided at one end of the carbon tubes, and a discharge port is provided at the other end of the carbon tubes; the heating assembly is connected to the carbon tubes; and the double rocker mechanism is connected to the carbon tubes. The present invention can achieve uniform mixing of graphite powder and uniform high-temperature purification, solving the problem that the existing high-temperature carbon tube furnace cannot achieve uniform heating, resulting in poor graphite purification effect.

Description

Technical Field

[0001] The present invention relates to the technical field of graphite purification, and in particular to a graphite purification method and a rotary high-temperature carbon tube furnace. Background Art

[0002] Graphite is a crystalline carbon that is widely found in nature. Purified high-purity graphite, due to its excellent properties such as high-temperature resistance, electrical and thermal conductivity, lubricity, corrosion resistance, plasticity, radiation resistance, and thermal shock resistance, is widely used in metallurgy, chemical engineering, electronics, new energy vehicles, medical devices, nuclear energy, military, and aerospace. Existing methods for graphite purification include flotation, acid-base methods, hydrofluoric acid methods, chlorination baking methods, and high-temperature methods. However, flotation methods produce low-purity products, while chemical methods such as acid-base methods, hydrofluoric acid methods, and chlorination baking methods are prone to corrosion of equipment and environmental pollution, making them incapable of producing high-purity graphite. Therefore, high-temperature methods are often used in industrial production to produce high-purity graphite.

[0003] The principle of high-temperature graphite purification is as follows: Graphite has excellent high-temperature resistance and a melting point of 3800-3900°C, making it one of the substances with the highest melting and boiling points known to date, far higher than the melting and boiling points of other impurities in the graphite during the purification process. Therefore, based on the difference in melting and boiling points between graphite and impurities, a high-temperature method is used to heat the graphite to below its melting point, causing the impurities to vaporize and escape, ultimately yielding high-purity graphite with a carbon content greater than 99.99%.

[0004] High-temperature graphite purification requires specialized purification equipment to ensure sufficient heating and purification of the graphite feedstock. The effectiveness of graphite purification depends largely on the heating performance of the purification equipment. For a long time, high-temperature graphite purification has primarily been performed using the Acheson furnace. This furnace utilizes arc heating, generating high temperatures through an arc formed between graphite electrodes. However, the intermittent operation of the Acheson furnace limits its efficiency, and its complex operation makes it unsuitable for large-scale production. In recent years, high-temperature carbon tube furnaces have become increasingly popular for high-temperature graphite purification. These furnaces utilize resistance or induction heating, offering continuous operation and significantly improving production efficiency. Furthermore, they are relatively simple to operate and control, capable of heating temperatures up to 2800°C and long periods of continuous operation. However, conventional high-temperature carbon tube furnaces lack uniform heating, resulting in poor graphite purification results.

[0005] In summary, it is necessary to provide a graphite purification method and a rotary high-temperature carbon tube furnace to solve the problem that the existing high-temperature carbon tube furnace cannot achieve uniform heating, resulting in poor graphite purification effect. Summary of the Invention

[0006] The present invention aims to provide a graphite purification method and a rotary high-temperature carbon tube furnace. The specific technical solutions are as follows:

[0007] In a first aspect, the present invention provides a method for purifying graphite, comprising:

[0008] Step S1, assembling a rotary high-temperature carbon tube furnace;

[0009] The rotary high-temperature carbon tube furnace comprises a furnace body, a carbon tube, a graphite boat, a heating assembly and a double rocker mechanism; a carbon black filling port is provided on the furnace body; the carbon tube is provided through the furnace body; a feed port is provided at one end of the carbon tube, and a discharge port is provided at the other end of the carbon tube; air holes are provided on the graphite boat; the number of the graphite boats is multiple, and they are arranged in the carbon tube through the feed port in sequence along the length direction of the carbon tube; a protective gas inlet is provided on one end of the carbon tube close to the discharge port; a protective gas inlet is provided on one end of the carbon tube close to the feed port. The shielding gas outlet is provided on the end; the shielding gas inlet is connected to the shielding gas outlet through the carbon tube; the heating assembly is connected to the carbon tube; the double rocker mechanism includes a first rocker, a second rocker, a connecting rod and a driving member; the first rocker is connected to one end of the carbon tube; the second rocker is connected to the other end of the carbon tube; one end of the connecting rod is connected to the end of the first rocker away from the carbon tube, and the other end of the connecting rod is connected to the end of the second rocker away from the carbon tube; the output end of the driving member is connected to the connecting rod;

[0010] Step S2, mixing graphite powder and flux in a mass ratio of 95:5-99:1 and then loading the mixture into the graphite boat; the flux is iodized salt; and loading each of the graphite boats into the carbon tubes through the feed port in sequence;

[0011] Filling carbon black into the furnace body through the carbon black filling port to form a carbon black filling layer between the inner wall of the furnace body and the outer wall of the carbon tube;

[0012] Step S3: High-temperature purification of graphite

[0013] The heating assembly is used to heat the carbon tube, and the heating temperature is controlled to be 2200-2800°C, and the heating time is 20-30 minutes. During the heating process, the double rocker mechanism is used to realize the axial rotation of the carbon tube, so that the impurities in the graphite powder that are heated and vaporized flow into the carbon tube through the pores on the graphite boat and are removed by the protective gas.

[0014] Optionally, the graphite purification method further includes step S4 post-processing; the post-processing includes taking out the graphite boat after high-temperature purification through the discharge port and placing it in a cooling pipe for cooling with cooling water.

[0015] Optionally, the post-processing further comprises pouring out the graphite powder in each of the graphite boats after cooling, mixing the graphite powder centrally and then bagging the mixture to obtain a graphite product.

[0016] Optionally, the purity of the graphite product is 99.995%-99.999%.

[0017] Optionally, the time interval between pushing two adjacent graphite boats at the feed port is 20-30 minutes; the time interval between pushing two adjacent graphite boats at the discharge port is 20-30 minutes; pushing the graphite boat at the feed port and pushing the graphite boat at the discharge port are completed synchronously.

[0018] Optionally, when the carbon tube rotates axially, the double rocker mechanism is used to drive the carbon tube to rotate 45°-90° to one side of the carbon tube, and then drive the carbon tube to rotate 45°-90° to the other side of the carbon tube. The carbon tube rotation angle is set at 45°-90°, which can ensure that the graphite is fully mixed and heated evenly, and the operation is relatively simple. If the rotation angle is too small, the graphite powder mixing effect is poor, and the flux and graphite powder are not in sufficient contact, which may cause the graphite powder to be heated unevenly, thereby affecting the purification effect. If the rotation angle is too large, it may increase the mechanical wear between the carbon tube and the graphite boat, and increase energy consumption, which is not conducive to the long-term operation of the carbon tube furnace equipment. In addition, the design is also more complicated. In summary, the carbon tube rotation angle is set at 45°-90°, which can not only ensure that the graphite powder and flux are fully mixed and evenly heated in the carbon tube, but also ensure the rationality of the operation.

[0019] Optionally, the graphite powder has a particle size of 50-200 mesh before being mixed with the flux.

[0020] Optionally, the flux includes potassium iodide or sodium iodide.

[0021] In a second aspect, the present invention provides a rotary high-temperature carbon tube furnace for performing the graphite purification method, further comprising an asbestos insulation layer; the asbestos insulation layer is disposed within the furnace body and between the inner wall of the furnace body and the carbon black filling layer; the number of layers of the asbestos insulation layer is 5-10;

[0022] The rotary high-temperature carbon tube furnace further includes a first opening and closing plate arranged on the feed port and a second opening and closing plate arranged on the discharge port.

[0023] Optionally, the heating assembly includes a first electrode copper bar, a second electrode copper bar, and a transformer; the first electrode copper bar and the second electrode copper bar are respectively connected to both ends of the carbon tube; and the ends of the first electrode copper bar and the second electrode copper bar away from the carbon tube are both connected to the transformer;

[0024] The rotary high-temperature carbon tube furnace further includes a PLC controller; the PLC controller is connected to the driving component and the transformer.

[0025] The application of the technical solution of the present invention has at least the following beneficial effects:

[0026] The present invention provides a graphite purification method and a rotary high-temperature carbon tube furnace. Graphite powder and a flux are mixed in a mass ratio of 95:5-99:1 and then loaded into a graphite boat. The flux is iodine salt. The iodine salt is used because iodine is a halogen element with relatively low harm. The iodine salt reacts with metal oxide impurities in the graphite to make the newly generated metal iodide have a lower melting point, which is conducive to the gasification and removal of impurities at a lower temperature, thereby improving the purity of the graphite. At the same time, the iodine salt is used in combination with a protective gas to reduce the oxygen potential in the carbon tube furnace, prompting the metal oxide impurities to generate a low-melting-point metal element, which is conducive to the gasification and removal at a lower temperature, thereby improving the purity of the graphite. The graphite boats are sequentially loaded into the carbon tube through the feed port. ; After high-temperature purification, it is taken out in sequence through the discharge port; a heating component is used to supply heat to the carbon tube, wherein the heating temperature is controlled to be 2200-2800℃ and the heating time is 20-30min, so as to realize high-temperature purification of the graphite powder; a double rocker mechanism is used to realize axial rotation of the carbon tube, which, on the one hand, facilitates the mixing of the graphite powder and uniform high-temperature purification, and on the other hand, facilitates the low-melting-point impurities in the graphite powder to flow into the carbon tube through the pores on the graphite boat after high-temperature gasification and be removed by the protective gas, thereby improving the purification effect; in addition, the flow direction of the protective gas from the protective gas inlet to the protective gas outlet is opposite to the feeding and discharging direction of the graphite powder in the carbon tube, which facilitates the formation of convection to timely remove the gas generated after the low-melting-point impurities in the graphite powder are vaporized, thereby improving the purification effect. Therefore, the present invention solves the problem that the existing high-temperature carbon tube furnace cannot achieve uniform heating, resulting in poor graphite purification effect.

[0027] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 1 is a structural schematic diagram of a rotary high-temperature carbon tube furnace according to an embodiment of the present invention;

[0030] Figure 2 yes Figure 1 Cross-section view in the AA direction;

[0031] Figure 3 yes Figure 1 Schematic diagram of the structure of the graphite boat;

[0032] Among them, 1. furnace body, 1.1. carbon black filling port, 2. carbon tube, 2.1. protective gas inlet, 2.2. protective gas outlet, 3. graphite boat, 4. first opening and closing plate, 5. second opening and closing plate, 6. first rocker, 7. second rocker, 8. driving part, 9. carbon black filling layer, 10. asbestos insulation layer, 11. support frame, 12. first electrode copper busbar, 13. second electrode copper busbar, 14. transformer. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0034] Example:

[0035] A graphite purification method comprising:

[0036] Step S1, assembling a rotary high-temperature carbon tube furnace;

[0037] See also Figure 1-Figure 3 The rotary high-temperature carbon tube furnace includes a furnace body 1, a carbon tube 2, a graphite boat 3, a heating component and a double rocker mechanism; a carbon black filling port 1.1 is provided on the furnace body 1; the carbon tube 2 is arranged through the furnace body 1; a feed port is provided at one end of the carbon tube 2, and a discharge port is provided at the other end of the carbon tube 2; air holes are provided on the graphite boat 3, specifically, the graphite boat 3 is a cylindrical structure, and detachable sealing covers are provided at both ends of the cylinder, and air holes are provided on the cylinder; the number of the graphite boats 3 is multiple, and they are arranged in the carbon tube 2 through the feed port in sequence along the length direction of the carbon tube 2; a protective gas inlet 2.1 is provided on the end of the carbon tube 2 close to the discharge port; The shielding gas outlet 2.2 is provided on one end close to the feed port, and the shielding gas outlet 2.2 is connected to the dust collection pipe; the shielding gas inlet 2.1 is connected to the shielding gas outlet 2.2 through the carbon tube 2; the heating assembly is connected to the carbon tube 2; the double rocker mechanism includes a first rocker 6, a second rocker 7, a connecting rod and a driving member 8; the first rocker 6 is connected to one end of the carbon tube 2; the second rocker 7 is connected to the other end of the carbon tube 2; one end of the connecting rod is connected to the end of the first rocker 6 away from the carbon tube 2, and the other end of the connecting rod is connected to the end of the second rocker 7 away from the carbon tube 2; the output end of the driving member 8 is connected to the connecting rod;

[0038] Step S2, graphite powder (sourced from a mine in Northeast China and having a purity of 99.95% after preliminary purification) and flux are mixed in a conical mixer at a mass ratio of 98:2, and then loaded into the graphite boat 3 through a graphite packaging machine; the flux is iodized salt (specifically sodium iodide), and iodized salt is used because iodine is a halogen element with relatively low harm. Iodized salt reacts with metal oxide impurities (such as aluminum oxide and magnesium oxide) in graphite to produce newly generated metal iodide with a lower melting point, which is conducive to the gasification and removal of impurities at a lower temperature, thereby improving the purity of the graphite; at the same time, the addition of iodized salt causes oxygen in the metal oxide impurities to be oxidized into oxygen and discharged with the protective gas, thereby reducing the oxygen potential in the carbon tube furnace and prompting the metal oxide impurities to generate a low-melting-point metal element, which is conducive to gasification and removal at a lower temperature, thereby improving the purity of the graphite; each of the graphite boats 3 is sequentially loaded into the carbon tube 2 through the feed port;

[0039] Carbon black is loaded into the furnace body 1 through the carbon black loading port 1.1 to form a carbon black filling layer 9 between the inner wall of the furnace body 1 and the outer wall of the carbon tubes 2. This is used to insulate the carbon tubes 2 and reduce the ingress of oxygen into the carbon tubes 2, thereby ensuring high-temperature purification of the graphite powder. One or more carbon black loading ports 1.1 may be provided as needed, and in this embodiment, two are provided.

[0040] Step S3: High-temperature purification of graphite

[0041] The heating assembly is used to heat the carbon tube 2, and the heating temperature is controlled to be 2600° C. and the heating time is 24 minutes. During the heating process, the double rocker mechanism is used to realize the axial rotation of the carbon tube 2. On the one hand, it is convenient for the graphite powder to be mixed and evenly purified at high temperature. On the other hand, it is convenient for the low-melting-point impurities in the graphite powder to flow into the carbon tube 2 through the pores on the graphite boat 3 after high-temperature vaporization and be removed by the protective gas (specifically nitrogen), thereby improving the purification effect. In addition, the flow direction of the protective gas used in this embodiment from the protective gas inlet 2.1 to the protective gas outlet 2.2 is opposite to the feeding and discharging direction of the graphite powder in the carbon tube 2, which facilitates the formation of convection to timely remove the gas generated after the low-melting-point impurities in the graphite powder are vaporized, thereby improving the purification effect. The use of protective gas can also prevent the graphite from being oxidized.

[0042] The graphite purification method further includes step S4 post-processing; the post-processing includes taking out the graphite boat 3 after high-temperature purification through the discharge port and placing it in a cooling pipe to cool it with cooling water.

[0043] The post-processing further includes pouring out the graphite powder in each of the graphite boats 3 after cooling, mixing it centrally in a cone mixer, and then bagging it to obtain a graphite product.

[0044] The purity of the graphite product is 99.995%.

[0045] The time interval for pushing two adjacent graphite boats 3 at the feed port is 24 minutes; the time interval for pushing two adjacent graphite boats 3 at the discharge port is 24 minutes; pushing the graphite boat 3 at the feed port and pushing the graphite boat 3 at the discharge port are completed synchronously.

[0046] The particle size of the graphite powder before mixing with the flux is 50-200 mesh. Crushing the graphite into 50-200 mesh graphite powder can increase its surface area and facilitate the flow of gas therein, thereby improving the reaction rate and purification efficiency.

[0047] See also Figure 2 The rotary high-temperature carbon tube furnace further includes an asbestos insulation layer 10 . The asbestos insulation layer 10 is disposed within the furnace body 1 and between the inner wall of the furnace body 1 and the carbon black filling layer 9 , thereby reducing heat loss and maintaining a high temperature environment within the furnace body 1 . The number of asbestos insulation layers 10 is 5-10, which can effectively reduce heat loss and maintain a high temperature environment within the furnace body 1 . When there are more than 10 asbestos insulation layers 10, the thermal insulation performance is not significantly improved. In this embodiment, eight asbestos insulation layers 10 are provided.

[0048] See also Figure 1 The rotary high-temperature carbon tube furnace also includes a first opening and closing plate 4 provided on the feed port and a second opening and closing plate 5 provided on the discharge port; the first opening and closing plate 4 is provided on the feed port, and the second opening and closing plate 5 is provided on the discharge port, so as to facilitate timely closing of the feed port and the discharge port after feeding and discharging, thereby avoiding heat loss in the carbon tube 2.

[0049] See also Figure 1 The heating assembly includes a first electrode copper bar 12, a second electrode copper bar 13 and a transformer 14; the first electrode copper bar 12 and the second electrode copper bar 13 are respectively connected to the two ends of the carbon tube 2; the ends of the first electrode copper bar 12 and the second electrode copper bar 13 away from the carbon tube 2 are both connected to the transformer 14, so as to improve the heating performance of the carbon tube 2.

[0050] The rotary high-temperature carbon tube furnace further includes a PLC controller (not shown in the figure); the PLC controller is connected to the driving member 8 and the transformer 14 to facilitate intelligent operation.

[0051] See also Figure 1 The rotary high-temperature carbon tube furnace further includes a support frame 11 ; the support frame 11 is connected to the bottom of the furnace body 1 to achieve support and fixation effects on the furnace body 1 .

[0052] The operation process of the rotary high temperature carbon tube furnace is as follows:

[0053] First, the first opening and closing plate 4 on the feed port is opened, and the graphite boats 3 containing the graphite powder to be purified are sequentially loaded into the carbon tubes 2 through the feed port. Then, the first opening and closing plate 4 is closed to reduce heat loss. A PLC controller is used to control the heating assembly to heat the carbon tubes 2. At the same time, the PLC controller controls the double rocker mechanism to achieve axial rotation of the carbon tubes 2. During rotation, the carbon tubes 2 first rotate 90 degrees to one side of the carbon tubes 2, and then rotate 90 degrees to the other side of the carbon tubes 2, achieving uniform high-temperature purification of the graphite powder.

[0054] After high-temperature purification, the second opening and closing plate 5 on the discharge port is opened, and the high-temperature purified graphite powder is taken out through the discharge port along with the graphite boat 3. At the same time, the first opening and closing plate 4 on the feed port is opened, and the graphite boat 3 containing the graphite powder to be purified is loaded into the carbon tube 2 through the feed port. The boat loading and boat unloading operations are completed simultaneously and are performed at the same time interval to ensure continuous operation of the rotary high-temperature carbon tube furnace.

[0055] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A graphite purification method, characterized in that, include: Step S1, assembling a rotary high-temperature carbon tube furnace; The rotary high-temperature carbon tube furnace comprises a furnace body (1), a carbon tube (2), a graphite boat (3), a heating assembly and a double rocker mechanism; a carbon black filling port (1.1) is provided on the furnace body (1); the carbon tube (2) is provided through the furnace body (1); a feed port is provided at one end of the carbon tube (2), and a discharge port is provided at the other end of the carbon tube (2); air holes are provided on the graphite boat (3); the number of the graphite boats (3) is plural, and they are sequentially provided in the carbon tube (2) through the feed port along the length direction of the carbon tube (2); a protective gas inlet (2.1) is provided on the end of the carbon tube (2) close to the discharge port; and a protective gas inlet (2.2) is provided on the end of the carbon tube (2) close to the feed port. The protective gas outlet (2.2) is provided; the protective gas inlet (2.1) is connected to the protective gas outlet (2.2) via the carbon tube (2); the heating assembly is connected to the carbon tube (2); the double rocker mechanism comprises a first rocker (6), a second rocker (7), a connecting rod and a driving member (8); the first rocker (6) is connected to one end of the carbon tube (2); the second rocker (7) is connected to the other end of the carbon tube (2); one end of the connecting rod is connected to the end of the first rocker (6) away from the carbon tube (2), and the other end of the connecting rod is connected to the end of the second rocker (7) away from the carbon tube (2); the output end of the driving member (8) is connected to the connecting rod; Step S2, mixing graphite powder and flux in a mass ratio of 95:5-99:1 and then loading the mixture into the graphite boat (3); the flux is iodine salt; and loading each graphite boat (3) into the carbon tube (2) through the feed port in sequence; Filling carbon black into the furnace body (1) through the carbon black filling port (1.1) to provide a carbon black filling layer (9) between the inner wall of the furnace body (1) and the outer wall of the carbon tube (2); Step S3: High-temperature purification of graphite The heating assembly is used to heat the carbon tube (2), the heating temperature is controlled to be 2200-2800° C., and the heating time is 20-30 minutes. During the heating process, the double rocker mechanism is used to realize the axial rotation of the carbon tube (2), so that the impurities in the graphite powder that are heated and gasified flow into the carbon tube (2) through the pores on the graphite boat (3) and are removed by the protective gas.

2. The graphite purification method according to claim 1, wherein The method further comprises post-processing step S4; the post-processing comprises taking out the graphite boat (3) after high-temperature purification through the discharge port and placing it in a cooling pipe to cool it with cooling water.

3. The graphite purification method according to claim 2, wherein The post-processing further comprises pouring out the graphite powder in each of the graphite boats (3) after cooling, mixing the powder together and then bagging the powder to obtain a graphite product.

4. The graphite purification method according to claim 3, wherein The purity of the graphite product is 99.995%-99.999%.

5. The graphite purification method according to claim 1, wherein The time interval for pushing two adjacent graphite boats (3) at the feed port is 20-30 minutes; the time interval for pushing two adjacent graphite boats (3) at the discharge port is 20-30 minutes; pushing the graphite boat (3) at the feed port and pushing the graphite boat (3) at the discharge port are completed synchronously.

6. The graphite purification method according to claim 1, characterized in that When the carbon tube (2) rotates axially, the double rocker mechanism is used to drive the carbon tube (2) to rotate 45°-90° toward one side of the carbon tube (2), and then drive the carbon tube (2) to rotate 45°-90° toward the other side of the carbon tube (2).

7. The graphite purification method according to claim 1, characterized in that The particle size of the graphite powder before being mixed with the flux is 50-200 meshes.

8. The method for purifying graphite according to any one of claims 1 to 7, characterized in that: The flux includes potassium iodide or sodium iodide.

9. A rotary high-temperature carbon tube furnace for carrying out the graphite purification method according to claim 8, characterized in that: It also includes an asbestos insulation layer (10); the asbestos insulation layer (10) is arranged in the furnace body (1) and is located between the inner wall of the furnace body (1) and the carbon black filling layer (9); the number of layers of the asbestos insulation layer (10) is 5-10; The rotary high-temperature carbon tube furnace further comprises a first opening and closing plate (4) arranged on the feed port and a second opening and closing plate (5) arranged on the discharge port.

10. The rotary high-temperature carbon tube furnace according to claim 9, characterized in that: The heating assembly comprises a first electrode copper bar (12), a second electrode copper bar (13) and a transformer (14); the first electrode copper bar (12) and the second electrode copper bar (13) are respectively connected to two ends of the carbon tube (2); and the ends of the first electrode copper bar (12) and the second electrode copper bar (13) away from the carbon tube (2) are both connected to the transformer (14); The rotary high-temperature carbon tube furnace further comprises a PLC controller; the PLC controller is connected to the driving component (8) and the transformer (14).

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