JPH11302009A - Graphitization electric furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the productivity, to reduce the production cost and to make the entire part of an electric furnace compact by a graphitization production process of a continuous system. SOLUTION: This electric furnace has a furnace casing 1 in which a partial region of the inside is formed as a graphitization region 7, a raw material powder supply means 2 which is arranged to face this furnace casing 1 across the graphitization region 7, a recovering means 3 for graphite powder and at least one set of electrodes 5, 6 which are disposed at the furnace casing 1 so as to be energized to the raw material powder of the graphitization region 7. While the raw material powder fed into the furnace casing 1 from the supply means 2 passes the graphitization region 7, the raw material powder is made into the graphite powder by energization between the electrodes 5 and 6 and is taken out of the furnace casing 1 by a recovering means 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphitizing electric furnace for producing graphite powder, and more particularly to a furnace capable of continuously producing graphite powder from raw material powder.

[0002]

2. Description of the Related Art Generally, in order to industrially produce graphite powder, a raw material powder such as a carbon powder is heated to about 3000 ° C. to 3500 ° C. in, for example, an inert atmosphere to graphitize the raw material powder. Do. As an apparatus used for this heat treatment, there are conventionally known Japanese Patent Application Laid-Open No. Hei 7-252726, Japanese Patent Publication No. Hei 3-330, and Japanese Patent No. 2579561.
An Acheson furnace as described in Japanese Unexamined Patent Publication (Kokai) No. HEI 10-301 is used.

[0003]

However, the Acheson furnace employs a batch-type manufacturing process in which a raw material powder is charged into a case, then heated and graphitized, and after cooling, the graphite powder is removed from the case. Therefore, not only is the basic unit of electric power large, but also the power supply equipment is large and the cost is high. In addition, it takes a long time to cool the graphite powder to a temperature at which it can be taken out, and the productivity is poor. The Acheson furnace is a large furnace that is not suitable for small-quantity production, requires a certain amount of processing, and is not only troublesome. It becomes something. further,
Since the change of the mixing of the raw material powders is mainly performed manually, if the amount of filling in the case is large, it will be a difficult operation, and time and
This is troublesome and causes an increase in cost, and the working environment is deteriorated by dust generated during the work. In addition, the Acheson furnace has a configuration in which, for example, a heating material is separately charged into a case filled with the raw material powder, and the raw material powder is indirectly heated by heat conduction by heating the heated material when the power is supplied. Heating efficiency was poor, and there was a problem of contamination of the raw material powder from the case.

[0004] The present invention has been made in view of such problems, and enables a continuous graphitization production process, instead of a batch type such as the Acheson furnace, so that the process from the input of raw material powder to the recovery of graphite powder can be performed. Shorter time, easy handling of mechanization and automation, improved productivity, reduced manufacturing cost, labor saving, clean working environment, uniform quality of graphite powder, compact graphite as a whole It is intended to provide a chemical electric furnace.

[0005]

Means for Solving the Problems In order to solve the above problems, the invention according to claim 1 comprises a furnace body having a graphitized region as a part of the inner region, and a furnace body opposed to the furnace body with the graphitized region interposed therebetween. Source means for supplying raw material powder and means for collecting graphite powder, and at least one set of electrodes provided on the furnace main body so as to energize the raw material powder in the graphitized region, wherein the raw material charged into the furnace main body from the supply means is provided. While the powder passes through the graphitized region, a technique is employed in which the powder is turned into graphite powder by current flowing between the electrodes and is taken out of the furnace body by the recovery means. In the graphitizing electric furnace according to the present invention, the raw material powder is taken out of the furnace main body as the graphite powder in the graphitization region while flowing through the inside of the furnace main body. , The graphite powder can be continuously taken out, and a continuous manufacturing process of the graphite powder can be realized.

According to a second aspect of the present invention, in the graphitizing electric furnace according to the first aspect, a technique is provided which includes gas supply means for setting the inside of the furnace main body to a predetermined atmosphere. In this graphitizing electric furnace, since the inside of the furnace main body is set to a predetermined atmosphere by the gas supply means, it is possible to suppress the fluctuation of the atmosphere inside the furnace main body due to the continuous charging of the raw material powder, and to achieve a stable Perform graphitization treatment.

According to a third aspect of the present invention, in the graphitizing electric furnace of the first or second aspect, the supply means and the recovery means adjust the supply amount of the raw material powder and the recovery amount of the graphite powder per unit time. A technique for setting the residence time of the raw material powder in the liquefied region is applied. In this graphitizing electric furnace, the residence time of the raw material powder in the graphitization region is set by adjusting the raw material powder supply amount and the graphite powder recovery amount, so that the residence time necessary for graphitization can be easily determined by the raw material powder supply amount and the like. Setting can be performed, and optimization of production efficiency in the continuous manufacturing process can be reliably performed with simple control.

According to a fourth aspect of the present invention, in the graphitizing electric furnace according to the first, second or third aspect, the recovery means arranges the graphite powder inlet near the graphitization region and connects the graphite powder to the furnace body from the inlet. A technology including a communication path connected to the outside is applied. In this graphitized electric furnace, the intake is located near the graphitized region, so the graphite powder heated in the graphitized region, that is, the desired temperature region, is efficiently taken into the communication passage and placed outside the furnace body. By taking it out, the quality is made uniform, and the graphite powder is appropriately cooled while passing through the communication passage, and the subsequent treatment of the graphite powder taken out of the furnace body becomes easy.

According to a fifth aspect of the present invention, there is provided the graphitizing electric furnace according to the fourth aspect, wherein the communication path is formed by a tubular member protruding inside the furnace body, and a block is arranged around the tubular member. Applied. In this graphitizing electric furnace, since a block is arranged around the tubular member, the heat of the graphite powder is transmitted to the block through the tubular member, thereby cooling the graphite powder and protecting the furnace body side wall. I have.

According to a sixth aspect of the present invention, there is provided the graphitized electric furnace according to the fourth aspect, wherein the communication path is formed by connecting through-holes of respective blocks stacked in the furnace main body. You. In this graphitizing electric furnace, since the communication passage is formed by connecting the through holes of the blocks, it is not necessary to separate the block for forming the communication passage and the block, and the formation of the communication passage is easy. Becomes

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view showing a graphitizing electric furnace according to the present invention. This graphitizing electric furnace has a rigid structure, and a furnace body 1 has an upper inlet 1
The supply means 2 for the raw material powder is connected via a, the collection means 3 for the graphite powder is connected to the lower part via a tubular member 4, and the electrodes 5 and 6 are attached to the opposing side walls, respectively. In the graphitizing electric furnace, a portion above the electrodes 5 and 6 of the furnace main body 1 is defined as a preheating zone a, and a portion including the graphitized region 7 between the electrodes 5 and 6 is defined as a heating zone b.
Below 6 is a cooling / discharge zone c.

The furnace body 1 is formed so that the shape of the lower portion is narrowed as it goes downward, thereby increasing the cooling efficiency. However, whether or not the lower portion is narrowed in this manner is optional.
Further, the furnace body 1 may have a horizontal cross section of either a circular shape or a square shape, and further includes a preheating zone a, a heating zone b,
Water cooling (liquid cooling) corresponding to one of the cooling and discharging zones c
Alternatively, cooling means such as air cooling (gas cooling) may be provided.

As shown in FIG. 1, the supply means 2 continuously feeds the raw material powder stored in the hopper 8 at a predetermined flow rate into the charging port 1.
A screw conveyor 9 is provided to feed the preheating zone a of the furnace main body 1 from a. Therefore, the amount of the raw material powder charged per unit time is set by the driving speed of the screw conveyor 9. However, the invention is not limited to the use of the screw conveyor 9, and for example, a belt conveyor or a turntable may be used. In addition, the raw material powder to be charged includes a powdery material and a granular material, and can be graphitized when heated at a high temperature, and has conductivity in a heating temperature range. A precursor or the like is used.

As shown in FIG. 1, the recovery means 3 is provided with a turntable 10 in a predetermined case for continuously cutting the graphite powder sent from the tubular member 4. The turntable 10 is rotated at a predetermined speed by a drive source 10a, and includes a scraper 11 for dropping graphite powder on the table into a hopper 12. Therefore, the amount of graphite powder taken out per time is set by the rotation speed of the turntable 10, whereby the residence time of the raw material powder (graphite powder) inside the furnace main body 1 is adjusted. However, the invention is not limited to using the turntable 10, and for example, a screw conveyor or a belt conveyor may be used. Whether or not to provide a liquid-cooled or gas-cooled cooling means in the case accommodating the turntable 10 is optional.

As shown in FIG. 2, the electrodes 5 and 6 are mounted on opposed side walls of the furnace main body 1 corresponding to the graphitized region 7 of the heating zone b. 14. Then, when a current is applied between the electrodes 5 and 6 (for example, 50 V, 1000 A), the raw material powder (graphite powder) generates heat by itself with Joule heat according to the specific resistance, and becomes a graphitized region 7 of about 2500 ° C. to 3500 ° C.
Is formed, and the raw material powder in this region is graphitized. Incidentally, the heat source of the preheating zone a is obtained by heat conduction from the heating zone b. On the other hand, the raw material powder deposited in the preheating zone a serves as a heat insulating layer that restricts heat dissipation from the heating zone b. Also works.

The arrangement of the electrodes 5 and 6 is not limited to being arranged at the same horizontal level as shown in FIG. 1 or symmetrically arranged with respect to the center of the furnace body 1 as shown in FIG.
They may be arranged in a shifted state. Further, as shown in FIG. 2, a plurality of sets of electrodes 5a, 5b, 5
The arrangement may be such that c, 6a, 6b, and 6c are arranged to face each other, and switching is performed by the control device 13 including the electrodes 5 and 6 to sequentially energize any one set of electrodes at predetermined time intervals. . With this configuration, the graphitized region 7 is formed in a substantially circular shape near the center of the furnace main body 1. When heating is performed with a pair of electrodes 5 and 6, an elliptic graphitized region 7 having a long diameter between the electrodes is formed.

Returning to FIG. 1, the intake 4a of the tubular member 4
Is disposed immediately below the graphitized region 7. The position of the intake port 4a is set for the purpose of efficiently removing the raw material powder appropriately graphitized in the graphitized region 7, that is, the graphite powder that has been heat-treated in a desired temperature region, by the collection means 3 efficiently. It is determined in consideration of the angle of repose of the raw material powder (graphite powder) in the furnace main body 1 indicated by the dashed line.
However, the position of the intake port 4a can be set arbitrarily, and may be arranged in the cooling / discharge zone c, for example, on the bottom surface of the lower end of the furnace body 1.

FIG. 3 and FIG. 4 show another embodiment of the collecting means 3. FIG. 3A shows a state in which an integrated block 18 is installed on the outer periphery of the tubular member 4. By the way, in the furnace main body 1 shown in FIG. 1, the graphite powder outside the tubular member 4 stays without being discharged, but the staying graphite powder prevents the contamination of the graphite powder with foreign materials. It also functions as a heat insulator. Therefore, since the block 18 is disposed in place of the retained graphite powder, it is necessary to secure both the contamination prevention and the heat insulation function of the graphite powder, and therefore, the block 18 is made of a material such as carbon. However, an appropriate temperature gradient can be formed by the block 18, and the
Side walls can be protected. Regarding prevention of such contamination of the graphite powder, securing of the heat insulating function and formation of an appropriate temperature gradient, FIGS. 3 (b) to 3 (d) and FIG.
The same applies to (a) to (c).

FIG. 3 (b) shows a state in which a plurality of blocks 19 having through holes with a constant inner diameter are stacked and arranged, and the tubular member 4 is passed through these through holes. By using a plurality of blocks 19 in this manner, thermal deformation in the horizontal direction is generated for each block, and cracks and the like due to thermal deformation can be suppressed.

FIG. 3C shows a block 19 in FIG. 3B.
3 are stacked in the same manner as in FIG.
Unlike FIG. 2B, a gap 21 is formed between the tubular member 4 and the gap 21 is filled with graphite powder. By filling the gap 21 between the tubular member 4 and the graphite powder (powder) in this manner, the tubular member 4 and the block 2 are filled.
While the heat conduction between 0 and 0 is performed via the graphite powder, for example, even when each block 20 expands and contracts in the horizontal direction, the graphite powder in the gap 21 absorbs this and makes contact with the tubular member 4. Can be secured.

FIG. 3D shows a state in which a tubular member 22 whose diameter is gradually increased on the lower side is used inside the furnace main body 1, and a block 23 is laminated on the outer periphery of the tubular member 22. By using such a tubular member 22, clogging of the graphite powder in the tubular member 22 (hanging on a shelf) is prevented, and fluidization is promoted. Note that an integrated block as shown in FIG. 3A may be used instead of the block 23,
Further, as shown in FIG.
May be provided, and the gap may be filled with graphite powder.

FIG. 4A shows a state in which blocks 24 each having a through hole with a constant inner diameter are stacked and arranged without using a tubular member.
The state where the passage 25 is formed by connecting the through holes is shown. This eliminates the need for a tubular member and can reduce costs. In addition, the through-hole of the uppermost block 24 serves as an intake 25 a for the graphite powder, and is disposed immediately below the graphitized region 7. Instead of the block 24, an integrated block provided with a through hole similar to the passage 25 may be used. Further, the number of stacked blocks 24 may be reduced, and a cylindrical member extending from the through hole of the uppermost block 24 to immediately below the graphitized region 7 may be provided.

FIG. 4B shows a state in which the blocks 26 are stacked in the same manner as in FIG. 4A, but shows a state where the diameter of the through holes of each block 26 is increased stepwise as it goes downward. . Thereby, a passage 27 having the same shape as the tubular member 22 of FIG. 3D is formed, and the clogging of the graphite powder is suppressed.
We are trying to fluidize the graphite powder.

FIG. 4C shows a structure in which the blocks 28 are stacked similarly to FIG. 4B, but the diameter of the passage 29 formed by connecting the through holes of each block 27 is continuously increased. The state is shown. Thereby, the clogging of the graphite powder is more effectively suppressed.

Returning to FIG. 1, the graphitizing electric furnace is provided with gas supply means 15 for blowing a predetermined gas into the furnace body 1 to set the inside of the furnace body 1 to a predetermined atmosphere. The upper discharge nozzle 16 is provided in the upper preheating zone a.
However, a lower discharge nozzle 17 is provided in the heating zone b at the center of the furnace body 1. As shown by the dotted arrow in FIG. 1, the gas supply means 15
A predetermined gas is blown into the graphitized region 7 in the furnace main body 1 through the furnace. As a gas to be supplied, a gas that does not hinder graphitization of the raw material powder, for example, a nitrogen gas or an argon gas containing no oxygen is used.

The means for blowing gas into the furnace main body 1 is not limited to the use of the tubular member 4, and a gas blowing nozzle may be provided at a lower portion of the furnace main body 1, for example. Further, the blowing position may be set not in the vicinity of the graphitized region 7 but in the cooling / discharge zone c to promote the cooling of the cooling / discharge zone c by gas blowing. However, whether or not gas is blown into the furnace main body 1 is optional. For example, graphitized electricity such as a type in which gas is not blown into the furnace main body 1 and a type in which the inside of the furnace main body 1 is set to a reduced pressure atmosphere (vacuum atmosphere) is used. The furnace may be of any type.

By blowing gas into the furnace body 1, it is possible to set a predetermined pressure so that air does not enter the inside of the furnace body 1, and this gas is heated during the preheating process in the preheating zone a. It becomes a carrier gas of an impure gas (for example, CmHn gas or the like) generated from the raw material powder due to decomposition or the like, so that the impure gas can be efficiently extracted from the upper discharge nozzle 16. When the temperature decreases, the CmHn gas condenses and liquefies, causing the raw material powder to be suspended on the shelf in the preheating section a. However, since the gas from the tubular member 4 passes through the graphitized region 7 and is heated, the gas such as CmHn can be extracted from the upper discharge nozzle 16 without condensing the gas such as CmHn by the heated gas. Is effectively suppressed. Further, when the gas passes through the tubular member 4, cooling of the graphite powder descending the tubular member 4 and hanging the shelf in the tubular member 4 are effectively suppressed,
The fluidization of the graphite powder in the tubular member 4 is promoted. The gas discharged from the upper discharge nozzle 16 is processed by combustion or the like.

The lower discharge nozzle 17 discharges the gas blown from the tubular member 4 from the furnace body 1 at a stage in the heating zone b. The gas discharged from the lower discharge nozzle 17 is
It is a gas that passes through the vicinity of the graphitized region 7 where no impurity gas is generated, and can be cooled as it is and reused again as a gas to be blown into the furnace body 1 by the gas supply means 15. When cooling the gas recovered from the lower discharge nozzle 17, the gas recovered from the lower discharge nozzle 17 may be used to heat hot water for furnace wall insulation (for preventing condensation) supplied to the furnace body 1. Whether or not to provide the lower discharge nozzle 17 is optional.

Further, in accordance with the gas atmosphere blown into the furnace body 1, when the raw material powder is stored in the hopper 8, the inside of the hopper 8 is replaced with a predetermined gas (for example, nitrogen gas) from air. May be prevented from flowing into the furnace body 1 when the raw material powder is charged. In this case, the predetermined gas may be replaced with air in the hopper 12 of the recovery means 3 to prevent the predetermined gas from leaking out of the apparatus by taking out the graphite powder.

Next, the operation of the graphitizing electric furnace configured as described above will be described. In the graphitizing electric furnace according to the present invention, the graphitizing treatment is continuously performed without storing a large amount of the raw material powder prepared in the preceding step. First, supply means 2
Of the raw material powder at a predetermined flow rate into the furnace main body 1 by driving the screw conveyor 9, and the turntable 10 of the collecting means 3 is rotated at a predetermined speed by the driving means 10a. Lower the raw material powder inside. The temperature of the raw material powder at the time of charging is room temperature, but is not limited to this, and the raw material powder may be heated in the supply unit 2.

By supplying a predetermined current and voltage between the electrodes 5 and 6 simultaneously with the driving of the supply means 2 and the recovery means 3, the raw material powder itself is heated in the heating zone b by Joule heat corresponding to the specific resistance of the raw material powder. Is heated. The raw material powder is put into the preheating zone a of the furnace body 1 and is preheated by heat conduction from the heating zone b. Therefore, even if the raw material powder is non-conductive at the time of charging, a material that becomes conductive by preheating, such as carbon powder, can be used as the raw material powder.

In addition, the powdery material generally has a low thermal conductivity. Therefore, since the raw material powder itself performs a heat insulating function, external heat is radiated to the outside of the furnace main body 1 while internal heat is difficult to escape, and as a result, the graphitized region 7 has a temperature of 2500 ° C. to 3 ° C.
It will be kept at a temperature of 500 ° C. However, the temperature of the graphitized region 7 can be appropriately set according to the size of the furnace main body 1, a change in current or voltage between the electrodes 5 and 6, the moving speed of the raw material powder in the furnace main body 1, and the graphitized region 7 Can be set similarly.

The raw material powder supplied to the preheating zone a of the furnace main body 1 descends with time while being preheated in accordance with the amount of the graphite powder cut out by the turntable 10 and passes through the graphitized region 7 of the heating zone b. During the passage, it is heated and graphitized. Thereafter, the graphite powder is taken into the tubular member 4 from the intake port 4a, and is cooled while passing through the tubular member 4 and the turntable 1 is cooled.
From 0, it is sent to the hopper 12 and sent to other devices.

As described above, while the raw material powder is continuously charged into the furnace main body 1 by the supply means 2, the graphite powder formed in the graphitized region 7 can be continuously taken out by the recovery means 3, and A continuous powder manufacturing process has been realized.

The shapes, combinations, and the like of the components shown in the above embodiment are merely examples, and various changes can be made based on design requirements without departing from the spirit of the present invention. In the drawing, the raw material powder is introduced from the upper part of the furnace main body 1 and taken out from the lower part of the furnace main body 1. For example, when the raw material powder (graphite powder) is forcibly moved by gas pressure or the like, the furnace The raw material powder may be introduced from the left side of the main body 1 and the graphite powder may be taken out to the right side of the furnace main body 1.

[0036]

As described above, in the graphitizing electric furnace according to the first aspect, the raw material powder is taken out of the furnace body as graphite powder in the graphitization region while flowing through the furnace body. By continuously collecting the raw material powders, high-quality graphite powder can be efficiently and continuously taken out by the recovery means while the raw material powders are continuously stored. realizable. Furthermore, since the continuous production process is used, the power consumption is small (about one third of the conventional furnace), the power supply equipment is small, and the cost can be reduced.

Further, the whole apparatus is compact and can be easily adapted to small-quantity production. Even if the operation is stopped due to a trouble during the operation, the damage is small and the operation can be resumed quickly. A case to fill the raw material powder like the Acheson furnace is not required, and there is no problem of contamination from the case,
Generation of dust at the time of filling and discharging the case is reduced, and a favorable working environment can be maintained. The charging of the raw material powder into the furnace body and the removal of the graphite powder can be mechanized, and the automation of the apparatus can be easily performed.

In the graphitizing electric furnace according to the second aspect, since the inside of the furnace main body is set to a predetermined atmosphere by the gas supply means, it is possible to suppress the fluctuation of the atmosphere inside the furnace main body caused by continuously charging the raw material powder. In addition, it is possible to prevent the hanging of the raw material powder in the furnace body and the hanging of the graphite powder at the time of taking out the graphite powder, to fluidize the powder and granules, and to cool the graphite powder, thereby performing a stable graphitization process. . Also, it becomes a carrier gas of the impure gas generated in the heating stage of the raw material powder,
Impurity gas can be easily discharged out of the furnace body.

In the graphitizing electric furnace according to the third aspect, the residence time of the raw material powder in the graphitization region is set by adjusting the supply amount of the raw material powder and the recovery amount of the graphite powder. It can be easily set by the powder supply amount and the like, and the optimization of the production efficiency in the continuous manufacturing process can be reliably performed with simple control.

In the graphitizing electric furnace according to the fourth aspect, since the intake is located near the graphitizing region, the graphite powder heated in the graphitizing region, that is, the desired temperature region, is efficiently introduced into the communication passage. The quality can be made uniform by taking it in and taking it out of the furnace body, and the graphite powder is cooled appropriately while passing through the communication passage, and the subsequent processing of the graphite powder taken out of the furnace body is easy. Become.

In the graphitizing electric furnace according to the fifth aspect, since the block is disposed around the tubular member, the heat of the graphite powder is transmitted to the block through the tubular member, so that the graphite powder can be cooled. The furnace body side wall can be protected.

In the graphitizing electric furnace according to the sixth aspect, since the communication passage is formed by connecting the through holes of the respective blocks, it is not necessary to separate the block for forming the communication passage from the member for forming the communication passage. In addition, the formation of the communication path is facilitated, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a graphitizing electric furnace according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view showing another embodiment of a collecting unit using a tubular member.

FIG. 4 is a cross-sectional view showing another embodiment of the collecting means that does not use a tubular member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace main body 2 Supply means 3 Recovery means 4,22 Tubular member 4a, 25a Intake port 5,6 Electrode 7 Graphitization area 15 Gas supply means 18,19,20,23,24,26,28 block

Continuing on the front page (72) Inventor Tomotoshi Mochizuki 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the Technical Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd. (72) Inventor Kenichi Nishi 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima Harima Heavy Industries, Ltd. Yokohama Engineering Center (72) Inventor Shigeki Iijima 1, Shinnakahara-cho, Isogo-ku, Yokohama, Kanagawa Prefecture Ishikawashima Harima Heavy Industries, Ltd. Yokohama Engineering Center (72) Inventor Koichi Fujita Kanagawa Ishikawashima Harima Heavy Industries Co., Ltd.

Claims (6)

[Claims] 1. A furnace body having a graphitized region as an internal partial region, a raw material powder supply unit and a graphite powder recovery unit disposed opposite to the furnace body with the graphitized region interposed therebetween, and the graphite At least one set of electrodes provided on the furnace main body so as to energize the raw material powder in the graphitized region, and wherein the raw material powder supplied to the furnace main body from the supply means passes through the graphitization region while A graphitizing electric furnace characterized in that the powder is turned into graphite powder by the current supply and taken out of the furnace body by the recovery means. 2. A gas supply means for setting the inside of the furnace main body to a predetermined atmosphere.
The described graphitizing electric furnace. 3. The graphitization according to claim 1, wherein said collection means sets a residence time of the raw material powder in said graphitization region by adjusting a collection amount of the graphite powder per unit time. Electric furnace. 4. The method according to claim 1, wherein the collecting means includes a communication passage for arranging an intake of the graphite powder near the graphitization region and connecting the intake to the outside of the furnace body. 4. The graphitizing electric furnace according to 2 or 3. 5. The graphitizing electric furnace according to claim 4, wherein the communication path is formed by a tubular member protruding inside the furnace main body, and a block is arranged around the tubular member. 6. The graphitizing electric furnace according to claim 4, wherein the communication path is formed by connecting through holes of respective blocks stacked in the furnace main body.