JP4196453B2 - Graphite production system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a graphite production system, and more particularly, to a technique for directly graphitizing carbon powder by direct heating by energization.
[0002]
[Prior art]
As a technique for producing graphite, a method is known in which an amorphous carbon powder having a non-constant crystal structure is graphitized by heat treatment at about 3000 ° C. or higher in an inert atmosphere to obtain a graphite powder. As such a graphite powder manufacturing apparatus, a batch type Atchison furnace is used. In the Atchison furnace, carbon powder is indirectly heated and graphitized by Joule heat generated by energizing coke, and graphite powder is produced in a batch type.
[0003]
[Problems to be solved by the invention]
By the way, in the production of graphite powder using the above-mentioned Atchison furnace, the carbon powder is heated to about 3000 ° C. or more and graphitized, and the produced graphite powder is cooled and taken out. It is bad and the quality is unstable. Therefore, development of a technique for producing high quality graphite powder with high productivity has been awaited.
[0004]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a graphite production system capable of producing high-quality graphite powder with high productivity.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, as a first means, a graphitization electric furnace for graphitizing an amorphous carbon powder having a non-constant crystal structure by electrification and heating in an inert gas atmosphere, and the graphitization Carbon powder supply device that supplies carbon powder as a raw material to an electric furnace, graphite powder recovery device that recovers graphite powder as a product from a graphitization electric furnace, and a cooling device that cools the graphite powder recovered by the graphite powder recovery device And a product inspection control for measuring the graphitization degree of the graphite powder cooled by the cooling device, and adjusting the carbon powder supply rate of the carbon powder supply device and the carbon powder recovery rate of the graphite powder recovery device based on the measurement result Means comprising the apparatus.
[0006]
Further, as the second means, in the first means, means for configuring the product inspection control device so as to adjust the energization amount to the carbon powder based on the measurement result of the graphitization degree is adopted.
[0007]
A third means includes a particle size classifier that selectively discharges graphite powder having a desired particle size from the graphite powder cooled by the cooling device in the second or third means, and the product inspection control device includes: A means of measuring the particle diameter of graphite powder as a product discharged from the particle size classifier and adjusting the classifying diameter in the particle size classifier based on the measurement result is adopted.
[0008]
As a fourth means, in the second or third means, a particle size classifier for selectively discharging carbon powder having a desired particle size from the carbon powder supplied to the graphitization electric furnace from the carbon powder supply device, The product inspection control apparatus employs means for measuring the particle diameter of the carbon powder supplied from the particle size classifier to the graphitization electric furnace and adjusting the classification diameter in the particle size classifier based on the measurement result.
[0009]
As a fifth means, in the third or fourth means, the particle size classifier is configured to classify the graphite powder or the carbon powder using the inert gas, and the inert gas for classification is used as the inert gas. A means of supplying to a graphitization electric furnace for the atmosphere is adopted.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a graphite production system according to the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a system configuration diagram showing a functional configuration of the present embodiment. In this figure, reference numeral 1 is a carbon powder supply device, 2 is a graphitization electric furnace, 3 is a graphite powder recovery device, 4 is a filter unit, 5 is a cooling device, 6 is a particle size classifier, 7 is a bag filter, and 8 is a blower. , 9 is an inert gas supply source, and 10 is a product inspection control device.
[0012]
The carbon powder supply apparatus 1 is composed of, for example, a hopper 1a, a screw feeder 1b, and an electric motor 1c. The hopper 1a stores amorphous carbon powder K1 whose crystal structure as a raw material is not constant. The carbon powder K1 is discharged from the lower portion of the hopper 1a when the screw feeder 1b is rotationally driven by the electric motor 1c, and is supplied to the graphitization electric furnace 2 from above. Various feeders such as a rotary feeder may be used instead of the screw feeder 1b.
[0013]
The graphitization electric furnace 2 is formed, for example, in a cylindrical shape, and electrodes 2a and 2a facing each other are provided on the side surfaces, and the inside thereof is an inert gas (for example, nitrogen gas) supplied from an inert gas supply source 9. Inert gas atmosphere. In such a graphitized electric furnace 2, a voltage is applied between the electrodes 2a and 2a in a state where the carbon powder K1 is filled therein, thereby energizing and heating the conductive carbon powder K1. The carbon powder K1 is heated to about 3000 ° C. or more by this energization and graphitized.
[0014]
The graphite powder recovery device 3 is composed of, for example, a screw feeder 3a and an electric motor 3b. The graphite powder recovery device 3 recovers the graphite powder K2 generated by graphitization of the carbon powder K1 from the lower portion of the graphitization electric furnace 2 by rotating the screw feeder 3a by the electric motor 3b. The graphite powder K2 can be recovered by using a rotary valve or the like instead of the screw feeder 3a.
[0015]
In the present embodiment, the inert gas supplied from the inert gas supply source 9 to the graphitization electric furnace 2 is circulated in the graphitization electric furnace 2. That is, the inert gas supplied from the inert gas supply source 9 to the lower part of the graphitizing electric furnace 2 is recovered from the upper part, and the recovered inert gas is supplied again to the lower part of the graphitizing electric furnace 2 and circulated. ing. The filter unit 4 removes dust (mainly carbon powder K1) contained in the inert gas recovered from the upper part of the graphitization electric furnace 2.
[0016]
The cooling device 5 cools the graphite powder K2 recovered by the graphite powder recovery device 3. Since the carbon powder K1 is heated to about 3000 ° C. or more and graphitized as described above, the graphite powder K2 is recovered by the graphite powder recovery device 3 at a considerably high temperature. The cooling device 5 cools the graphite powder K2 to near normal temperature. The cooling method in the cooling device 5 may be either a water cooling method or an air cooling method. Further, the cooling of the graphite powder K2 can be performed at a stage prior to the recovery of the graphite powder K2 from the graphitizing electric furnace 2, and it is also possible to cool the graphite powder K2 while collecting it.
[0017]
The particle size classifier 6 selectively discharges graphite powder (K2) having a desired particle diameter from the graphite powder K2 discharged from the cooling device 5. More specifically, the particle size classifier 6 removes graphite powder K2 having a relatively small particle size from the graphite powder K2 discharged from the cooling device 5, and discharges only a particle having a relatively large particle size as a product. The particle size threshold (ie, the classification diameter) is, for example, 5 μm, and is a value required when a high-quality battery electrode is formed from graphite powder K2.
[0018]
FIG. 2 is a conceptual diagram showing a configuration example of a cyclone separator applied to the particle size classifier 6. As shown in this figure, the cyclone separator includes an inlet portion 6a for simultaneously taking in an inert gas and graphite powder K2, and a cylindrical portion 6b (outer cylinder) in which the inlet portion 6a is attached in the tangential direction of the outer periphery. The conical portion 6c formed coaxially below the cylindrical portion 6b, the dust collection chamber 6d positioned below the conical portion 6c, and coaxially inserted into the cylindrical portion 6b and attached to the bag filter 7 It is comprised from the exit pipe | tube (inner cylinder) 6e which connects.
[0019]
In such a cyclone separator, the flow path of the inert gas taken in from the inlet portion 6a becomes a downward spiral toward the inlet portion 6a → cylindrical portion 6b → conical portion 6c, as indicated by a broken line arrow. In the lower part of the conical part 6c, it reverses to form an upward flow and is discharged from the outlet tube 6e. Therefore, the graphite powder K2 taken in at the same time as the inert gas acts as an upward flow and a vortex flow. Therefore, a relatively light and small particle size is discharged from the outlet tube 6e by the upward flow. Those having a large particle size are attached to the wall surfaces of the cylindrical portion 6b and the conical portion 6c and collected in the dust collecting chamber 6d.
[0020]
Here, the relationship between the minimum particle size x of the graphite powder K2 discharged from the outlet tube 6e and the inert gas flux u is generally expressed by the following equation (1) using a coefficient k. .
x = k · u ^-1/2 (1)
That is, as the flux u increases, the minimum separation diameter x decreases, the proportion of the graphite powder K2 collected in the dust collection chamber 6d containing a relatively small particle size increases, and as the flux u decreases, the minimum separation diameter x decreases. The particle size x increases, and the proportion of graphite powder K2 collected in the dust collection chamber 6d that contains particles having a relatively small particle size decreases.
[0021]
In addition, as the particle size classifier 6 applied to this invention, various classifiers are applicable, without being limited to the said cyclone separator. For example, in addition to a classifier using a free vortex and a semi-free vortex by a cyclone or a cyclone deformation, it has a function to improve dispersion of fine particles such as a dispersion plate, or a rotor that forcibly forms a vortex. It is conceivable to use a wide variety of classifiers such as classifiers.
[0022]
The bag filter 7 removes the small-diameter graphite powder K2 from the inert gas sucked in the particle size classifier 6. The blower 8 sucks an inert gas from the particle size classifier 6 through the bag filter 7 and outputs the sucked inert gas to the graphitization electric furnace 2. The inert gas supply source 9 is for supplying an inert gas for making the inside of the graphitizing electric furnace 2 an inert gas atmosphere to the graphitizing electric furnace 2 and the particle size classifier 6.
[0023]
The inert gas discharged from the blower 8 is added to the inert gas supplied from the inert gas supply source 9 to the graphitizing electric furnace 2 and supplied to the graphitizing electric furnace 2. This is because the inert gas sucked from the particle size classifier 6 by the blower 8 is effectively used. The particle size classifier 6, the bag filter 7, and the blower 8 form a closed closed loop L related to the inert gas supplied from the inert gas supply source 9.
[0024]
The product inspection control device 10 measures the graphitization degree and particle size of the graphite powder K2 discharged from the particle size classifier 6 as a product, and based on the measurement result, the rotational speed of the electric motors 1c and 3b and the supply amount due to change The discharge amount is controlled, the energization amount to the electrodes 2a and 2a and the suction amount of the inert gas by the blower 8 are controlled. The product inspection control device 10 takes in the measurement values for measuring the graphitization degree of the graphite powder K2, the measurement unit for measuring the particle size of the graphite powder K2, and the measurement values of these measurement components, and based on the measurement values. The control unit controls the above-mentioned various amounts, that is, the number of rotations of the electric motors 1c and 3b, the energization amount to the electrodes 2a and 2a, and the suction amount of the inert gas by the blower 8.
[0025]
The measurement unit for measuring the degree of graphitization of the graphite powder K2 utilizes, for example, the fact that the diffraction state of X-rays irradiated to the graphite powder K2 changes according to the degree of graphitization. Depending on the degree of graphitization, the spacing between the crystal faces of the graphite powder K2 varies. Therefore, by irradiating the graphite powder K2 with X-rays, the interval between crystal planes, that is, the degree of graphitization, can be grasped as a change in the X-ray diffraction state. As a method for measuring the degree of graphitization, various methods such as a method for measuring electric resistance and a method for measuring magnetic properties are known, but these methods may be applied.
[0026]
On the other hand, the measuring unit for measuring the particle size of the graphite powder K2 is a laser particle size meter, for example, and measures the particle size of the graphite powder K2 by irradiating the graphite powder K2 with laser light. Since various methods for measuring the particle size of the powder are known, other methods may be applied.
[0027]
Next, the operation of the graphite production system having the above configuration will be described in detail.
When the present graphite production system starts operation, the product inspection control device 10 always operates the electric motor 1c and operates the electric motor 3b constantly or intermittently. Further, the product inspection control device 10 applies a constant voltage to the electrodes 2a, 2a, and always supplies and heats the carbon powder K1 in the graphitization electric furnace 2.
[0028]
On the other hand, from the inert gas supply source 9, an inert gas for making the inside of the graphitization electric furnace 2 an inert gas atmosphere is sequentially supplied to the graphitization electric furnace 2 and constantly circulated through the filter unit 4. . Therefore, the carbon powder K1 supplied from above to the graphitization electric furnace 2 by the carbon powder supply device 1 is continuously heated and graphitized while moving in the graphitization electric furnace 2 from the upper side to the lower side. The powder is recovered continuously by the powder recovery device 3 as graphite powder K2.
[0029]
The graphite powder K2 continuously recovered in this way is sequentially sent to the cooling device 5 and continuously cooled, and is sequentially sent out toward the particle size classifier 6. The particle size classifier 6 forms a closed loop L related to the inert gas by the bag filter 7 and the blower 8. The inert gas is blown together with the graphite powder K 2, and the blown inert gas is blown into the blower 8. Sucked by.
[0030]
Accordingly, as described above, the graphite powder K2 having a relatively small particle size is separated on the bag filter 7 side according to the flux of the inert gas flowing in the particle size classifier 6. Only the graphite powder K2 having a relatively large particle size is discharged as a product. The graphite powder K2 separated on the bag filter 7 side is separated from the inert gas by the bag filter 7, and only the inert gas is sucked into the blower 8.
[0031]
On the other hand, a part of the graphite powder K 2 discharged as a product from the particle size classifier 6 is supplied to the product inspection control device 10. In the product inspection control device 10, the measurement of the graphitization degree by the X-ray diffraction unit and the measurement of the particle size by the laser beam are performed in parallel in each measurement unit, and each measurement value is input to the control unit. . The control unit controls the rotation speed of the electric motors 1c and 3b, the energization amount to the electrodes 2a and 2a, and the suction amount of the inert gas by the blower 8 based on the measured values.
[0032]
Here, the product inspection control device 10 (precisely, the control unit) determines the graphitization degree as the reference graphite when the graphitization degree of the graphite powder K2 measured by the measurement unit is lower than a preset reference graphitization degree. In order to make it equal to or greater than the degree of conversion, the rotational speed of the electric motors 1c and 3b is decreased to decrease the supply amount and the discharge amount, and the energization amount to the electrodes 2a and 2a is increased.
[0033]
As a result, the supply amount of the carbon powder K1 to the graphitization electric furnace 2 by the carbon powder supply device 1 decreases, and the recovery amount of the graphite powder K2 by the graphite powder recovery device 3 decreases, so that the graphitized electricity of the carbon powder K1 is reduced. The residence time in the furnace 2 becomes longer. In addition, heating of the carbon powder K1 is further promoted by increasing the amount of current applied to the electrodes 2a and 2a. Therefore, by these actions, the graphitization degree of the carbon powder K1 in the graphitization electric furnace 2 is further promoted to exceed the reference graphitization degree.
[0034]
In addition, the product inspection control device 10 determines the electric motor 1c, the motor 1c, in order to make the graphitization degree equal to or higher than the reference graphitization degree when the graphitization degree of the graphite powder K2 measured by the measuring unit is higher than the reference graphitization degree. While reducing the rotation speed of 3b, the energization amount to electrode 2a, 2a is increased. As a result, both the supply amount and the recovery amount of the carbon powder K1 to the graphitization electric furnace 2 are increased, and the residence time of the carbon powder K1 in the graphitization electric furnace 2 is shortened. In addition, since the amount of current applied to the electrodes 2a and 2a is reduced, heating of the carbon powder K1 is suppressed. Therefore, the graphitization degree of the carbon powder K1 is suppressed and becomes lower than the standard graphitization degree.
[0035]
By controlling the degree of graphitization by the product inspection control device 10 as described above, the degree of graphitization of the graphite powder K2 discharged from the particle size classifier 6 as a product is distributed in the vicinity of the reference graphitization degree and is made uniform.
[0036]
On the other hand, in the product inspection control apparatus 10, when the particle diameter of the graphite powder K2 measured by the measuring unit is smaller than the preset classification diameter, that is, the mixing ratio of the graphite powder K2 having a particle diameter of 5 μm or less is a predetermined standard. When it is higher than the mixing rate, the suction amount of the inert gas by the blower 8 is decreased. As a result, in the particle size classifier 6, since the graphite powder K2 having a larger particle size is separated on the bag filter 7 side based on the above equation (1), the particle size is less than 5 μm contained in the graphite powder K2 discharged as a product. The mixing rate of graphite powder K2 having a particle size of less than the reference mixing rate.
[0037]
Further, when the particle diameter of the graphite powder K2 measured by the measuring unit is larger than a predetermined classification diameter, that is, for example, when the mixing ratio of the graphite powder K2 having a particle diameter of 5 μm or less is lower than a predetermined reference mixing ratio. The amount of inert gas sucked by the blower 8 is increased. As a result, in the particle size classifier 6, the graphite powder K2 having a smaller particle diameter is separated on the bag filter 7 side, so that the graphite having a particle diameter of 5 μm or less contained in the graphite powder K2 discharged as a product. The mixing rate of the powder K2 is higher than the reference mixing rate.
[0038]
By such particle size control of the graphite powder K2 by the product inspection control device 10, the classified diameter of the graphite powder K2 discharged from the particle size classifier 6 as a product is distributed more than the classified diameter and has a particle diameter of 5 μm or less. The mixing rate of the graphite powder K2 is made uniform in the vicinity of the reference mixing rate.
[0039]
As described above, according to the present embodiment, the degree of graphitization of the graphite powder K2 is made uniform in the vicinity of the reference graphitization degree, and the mixing rate of the graphite powder K2 having a particle size of 5 μm or less is larger than the reference mixing rate. Can be kept low. Therefore, it is possible to produce graphite powder K2 having a high quality with respect to the degree of graphitization and the particle size.
[0040]
Further, unlike the conventional batch method, the graphite powder K2 can be continuously produced, so that the productivity relating to the production of the graphite powder K2 can be improved. In addition, since the inert gas in the graphitization electric furnace 2 is circulated through the filter unit 4, the graphitization electric furnace 2 with the carbon powder K 1 or the graphite powder K 2 and the pipes communicating with the graphitization electric furnace 2 are used. It is possible to prevent clogging, and therefore the graphite powder K2 can be continuously produced more stably.
[0041]
In addition, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the above-described embodiment, the graphite powder K2 output from the cooling device 5 is configured to perform particle size classification. For example, the carbon powder K1 supplied from the carbon powder supply device 1 to the graphitization electric furnace 2 is changed to a particle size. You may classify. That is, it is conceivable that the particle size classifier 6 is interposed between the carbon powder supply apparatus 1 and the graphitization electric furnace 2 to separate and remove the carbon powder K1 having a particle size smaller than 5 μm.
[0042]
(2) In the above embodiment, the graphite increasing system is configured such that the carbon powder K1 is continuously supplied to the graphitization electric furnace 2 and the graphite powder K2 is continuously recovered. You may comprise so that supply of K1 and collection | recovery of graphite powder K2 may be performed. Even in this case, unlike the conventional batch method, the graphite powder can be produced substantially continuously.
[0043]
(3) In the above embodiment, the inert gas is sucked from the particle size classifier 6 by the blower 8, but the present invention is not limited to this. For example, a blower is provided in parallel with the graphite powder recovery device 3 and supplied to the particle size classifier 6 by adding an inert gas discharged from the blower to the graphite powder K2 discharged from the graphite powder recovery device 3. Anyway. In this case, an inert gas is supplied from the inert gas supply source 9 to the blower, and the inert gas output from the bag filter 7 is directly supplied to the graphitization electric furnace 2.
[0044]
(4) In the above embodiment, the quality of the graphite powder K2 is improved by making the graphitization degree and the particle size of the graphite powder K2 uniform, but it is necessary to make both the degree of graphitization and the particle size uniform. There is no. Only the degree of graphitization may be made uniform according to the use of the graphite powder K2 taken out as a product. For example, when graphite powder K2 taken out as a product is used as an electrode material for a battery, it is possible to configure a higher quality electrode by suppressing the mixing rate of graphite powder K2 having a particle size of 5 μm or less, for example. it can.
[0045]
(5) Further, in the above embodiment, the graphite powder K2 recovered from the graphitization electric furnace 2 is cooled using the cooling device 5, but this cooling can also be performed before the recovery. In addition, it may be possible to apply a graphite powder recovery device 3 having a cooling function, or it may be possible to use a combination of cooling before and after recovery and cooling by the graphite powder recovery device 3.
[0046]
【The invention's effect】
As described above, the graphite production system according to the present invention has the following effects.
(1) A graphitization electric furnace for graphitizing an amorphous carbon powder having a non-constant crystal structure by electrification and heating in an inert gas atmosphere, and a carbon powder supply device for supplying carbon powder as a raw material to the graphitization electric furnace A graphite powder recovery device for recovering graphite powder as a product from the graphitization electric furnace, a cooling device for cooling the graphite powder recovered by the graphite powder recovery device, and a degree of graphitization of the graphite powder cooled by the cooling device And a product inspection control device that adjusts the carbon powder supply rate of the carbon powder supply device and the carbon powder recovery rate of the graphite powder recovery device based on the measurement result, so that the degree of graphitization of the graphite powder is measured. Based on the result, it is possible to control the residence time of the carbon powder in the graphitization electric furnace, that is, the heating time of the carbon powder, and therefore It is possible to produce a good graphite powder quality for lead content of.
[0047]
(2) In addition to controlling the heating time of the carbon powder, the product inspection control device is configured to adjust the amount of current applied to the carbon powder based on the measurement result of the degree of graphitization, so the heating rate of the carbon powder Can be controlled. Therefore, since the carbon powder can be graphitized in a shorter time, it is possible to produce a graphite powder having a high quality with respect to the degree of graphitization. When used in combination with the above control of the heating time, the degree of graphitization can be adjusted with better responsiveness, so that even higher quality graphite powder can be produced.
[0048]
(3) In addition to controlling the heating time or heating speed of the carbon powder, a product inspection control device is equipped with a particle size classifier that selectively discharges graphite powder having a desired particle size from the graphite powder cooled by the cooling device. Measures the particle size of graphite powder as a product discharged from the particle size classifier and adjusts the particle size in the particle size classifier based on the measurement result. In addition to the degree of graphitization of the graphite powder, a high quality graphite powder can be produced not only with respect to the particle size.
[0049]
(4) In addition to controlling the heating time or heating rate of the carbon powder, a particle size classifier that selectively discharges carbon powder having a desired particle size from the carbon powder supplied from the carbon powder supply device to the graphitization electric furnace. The product inspection control device measures the particle size of the carbon powder supplied to the graphitization electric furnace from the particle size classifier, and adjusts the classified diameter in the particle size classifier based on the measurement result. By classifying the powder into particles, not only the degree of graphitization of the graphite powder but also high quality graphite powder with respect to the particle size can be produced.
[0050]
(5) Since the particle size classifier is configured to classify the graphite powder) or carbon powder using an inert gas, and the inert gas for classification is supplied to the graphitization electric furnace for the inert gas atmosphere, An inert gas for particle size classification can be used effectively.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram showing a functional configuration of an embodiment of the present invention.
FIG. 2 is a conceptual diagram showing an example of a particle size classifier in an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Carbon powder supply apparatus 1a ... Hopper 1b ... Screw feeder 1c ... Electric motor 2 ... Graphitization electric furnace 2a ... Electrode 3 ... Graphite powder collection device 3a ... Screw feeder 3b ... Electric motor 4 ... Filter unit 5 ... Cooling device 6 ... Particle size classifier 6a ... Inlet part 6b ... Cylindrical part 6c ... Conical part 6d ... Dust collection chamber 6e ... Outlet cylinder 7 ... Bag filter 8 ... Blower 9 ... ... Inert gas supply source 10 ... Product inspection control device

Claims (5)

A graphitization electric furnace (2) for graphitizing an amorphous carbon powder (K1) having a non-constant crystal structure by electrification and heating in an inert gas atmosphere;
A carbon powder supply device (1) for supplying carbon powder (K1) as a raw material to the graphitization electric furnace (2);
A graphite powder recovery device (3) for recovering graphite powder (K2) as a product from the graphitization electric furnace (2);
A cooling device (5) for cooling the graphite powder (K2) recovered by the graphite powder recovery device (3);
The degree of graphitization of the graphite powder (K2) cooled by the cooling device (5) is measured, and based on the measurement result, the carbon powder supply speed of the carbon powder supply device (1) and the graphite powder recovery device (3) A product inspection control device (10) for adjusting the carbon powder recovery rate;
A graphite production system comprising: The graphite production system according to claim 1, wherein the product inspection control device (10) is configured to adjust the amount of current applied to the carbon powder (K1) based on the measurement result of the degree of graphitization. A particle size classifier (6) for selectively discharging graphite powder (K2) having a desired particle diameter from the graphite powder (K2) cooled by the cooling device (5) is provided. The particle size of the graphite powder (K2) as a product discharged from the particle size classifier (6) is measured, and the classifying diameter in the particle size classifier (6) is adjusted based on the measurement result. The graphite production system according to 1 or 2. The product is equipped with a particle size classifier (6) that selectively discharges carbon powder (K1) of a desired particle size from the carbon powder (K1) supplied from the carbon powder supply device (1) to the graphitization electric furnace (2). The inspection control device (10) measures the particle size of the carbon powder (K1) supplied from the particle size classifier (6) to the graphitization electric furnace (2), and based on the measurement result, the particle size classifier (6). 3. The graphite production system according to claim 1 or 2, wherein the classification diameter is adjusted. The particle size classifier (6) is configured to classify the graphite powder (K2) or the carbon powder (K1) using an inert gas, and the graphitizing electric furnace uses the inert gas for classification as an inert gas atmosphere. The graphite production system according to claim 3 or 4, wherein the graphite production system is supplied to (2).

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