JPH11322320A - Electric furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric furnace capable of continuously withdrawing graphitized powder, facilitated in control of the withdrawal quantity, and also capable of efficiently cooling the graphitized powder. SOLUTION: This electric furnace is designed to treat feedstock powder charged via the top of the furnace body 1 under heating and continuously withdraw the resulting graphite powder (graphitized powder) after heating via the bottom of the furnace body 1 by a recovery means 5, and the recovery means 5 has a drive table 10 placed under the outlet port 3d of a tubular member 3 and rotating with graphite powder put thereon and a scraper (discharge part) 12 for dropping the graphite powder on the table 10 into a hopper (discharge part) 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric furnace for producing powder such as graphite powder, and more particularly, to stabilizing continuous production of powder by continuously extracting produced powder from a furnace body. Related to what can be implemented.

[0002]

2. Description of the Related Art Generally, in order to industrially produce a powder such as a graphite powder, a raw material powder such as a carbon powder is heat-treated at, for example, about 3000 to 3500 ° C. in an inert atmosphere to graphitize the raw material powder. It is done by doing. As a device used for this heat treatment, a conventional device is disclosed in Japanese Patent Application Laid-Open No. 7-252.
No. 726, Japanese Patent Publication No. 3-330, Patent No. 257
An Acheson furnace as described in US Pat. No. 9561 or the like 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 to be graphitized, cooled, and then the graphite powder is taken out of the case. To do so, it has the following problems. The basic unit of electric power is large, and the power supply equipment is also large, resulting in high costs. It takes a long time to cool the graphite powder, resulting in poor productivity. It is not suitable for small-lot production. It takes time and effort to fill the raw material powder into the case, and the working environment is deteriorated by dust and the like generated during the work. Since the raw material powder is heated by the conduction of the heating material filled in the case and the heat conduction, the heating efficiency is poor, and there is a problem of contamination of the raw material powder from the case.

In order to cope with such a problem, there is an electric furnace in which the raw material powder is supplied from the upper part of the furnace main body, heat-treated while the raw material powder descends, and the produced powder is continuously taken out from the lower part of the furnace main body. Conceivable. In this electric furnace, it is necessary to reliably perform continuous cutting of the produced powder in order to ensure continuity of production. Further, since the cut-out speed of the produced powder is related to the residence time of the raw material powder in the furnace main body, it is desired that this can be easily controlled. Furthermore, since the generated powder taken out of the furnace main body has a high temperature, it is necessary to efficiently cool the generated powder before sending it to a subsequent transport path.

The present invention has been made in view of such a problem, and enables not only continuous production of the produced powder to be taken out, but also easy control of the amount of produced powder taken out.
It is a further object of the present invention to provide an electric furnace capable of efficiently cooling the produced powder while taking out the produced powder.

[0006]

In order to solve the above problems, the invention according to claim 1 is to heat the raw material powder introduced from the upper part of the furnace main body, and collect the heated powder by the recovery means. An electric furnace configured to continuously take out from the lower part of the furnace, wherein a recovery means is disposed below the produced powder outlet of the furnace main body, and a driving table on which the produced powder is placed and rotated; A technology including a discharge unit for taking in the generated powder is employed. In this electric furnace, the generated powder in the furnace body is cut out by rotating the drive table, so that it is possible to continuously remove the generated powder, and to adjust the amount of removal per unit time by changing the rotation speed. Thereby, the residence time of the produced powder in the furnace main body can be set. Further, since the produced powder is cooled while being placed on the drive table,
Subsequent handling of the resulting powder is facilitated.

According to a second aspect of the present invention, in the electric furnace according to the first aspect, a plurality of driving tables are arranged in a state of being connected to each other, and the generated powder placed on the preceding driving table is interposed between the driving tables. A technique in which a transfer means for transferring to the next drive table is provided is applied. In this electric furnace, a plurality of driving tables are connected to transfer the generated powder, so that the generated powder is exposed to the atmosphere when transferring to the next driving table as well as on each of the driving tables, thereby efficiently reducing the generated powder. It is possible to cool well.

According to a third aspect of the present invention, there is provided an electric furnace wherein a raw material powder charged from an upper portion of a furnace body is subjected to a heat treatment, and a produced powder after heating is continuously taken out from a lower portion of the furnace body by a recovery means. A collection means, any one of which moves so as to be connected to the generated powder outlet of the furnace main body and stores a plurality of cases for storing the generated powder from the furnace main body, and a discharge unit for taking in the generated powder in the case. The technology provided with is adopted. In this electric furnace, the generated powder is once stored in the case and then transferred to the discharge section, so that the generated powder can be cooled in the case, and furthermore, the discharge path of the generated powder discharged from the furnace body is reduced. Since a part can be replaced by the length of the case, the height of the device can be reduced, and the installation space can be reduced.

According to a fourth aspect of the present invention, in the electric furnace according to the third aspect, a technique is applied in which the case has a lid portion that can be opened at a lower portion, and the discharge portion has an operation portion that opens the lid portion. . In this electric furnace, since the transfer of the generated powder from the case to the discharge unit is performed by opening the lid, the transfer of the generated powder can be easily and reliably performed, and even if there are a large number of cases, it can be handled. .

According to a fifth aspect of the present invention, there is provided an electric furnace wherein a raw material powder charged from an upper part of a furnace body is subjected to a heat treatment, and a produced powder after heating is continuously taken out from a lower part of the furnace body by a recovery means. A collecting means for connecting the one end to the product powder outlet of the furnace body and transferring the generated powder from the furnace body; and a product powder connected and transferred to the other end of the conveyor. And a discharge unit for taking in the air. In this electric furnace, the generated powder of the furnace body is cut out by driving the conveyor,
By changing the driving speed, the amount of extraction per unit time can be adjusted while enabling the continuous extraction of the generated powder, whereby the residence time of the generated powder in the furnace body can be set. In addition, subsequent handling of the generated powder is facilitated because the generated powder is cooled while being transported on the conveyor.

According to a sixth aspect of the present invention, in the electric furnace according to the fifth aspect, a technology is applied in which the conveyor is a belt conveyor or a screw conveyor. In this electric furnace,
Since a belt conveyor or a screw conveyor is applied as the conveyor, the control of the driving speed is facilitated, and the cutout amount of the generated powder can be easily adjusted.

[0012] The invention according to claim 7 is the invention according to claims 1 and 2,
In the 3, 4, 5 or 6 electric furnaces, a technique including a chamber accommodating a recovery unit and a gas supply unit for supplying a predetermined gas to the chamber is applied. In this electric furnace, it is possible to prevent the combustion of the generated powder by supplying a predetermined gas into the chamber and to cool the generated powder being transferred.

According to an eighth aspect of the present invention, in the electric furnace according to the seventh aspect, a technique is applied in which the furnace main body and the chamber are connected and a predetermined gas from gas supply means is supplied to the furnace main body through the chamber. . In this electric furnace, the predetermined gas is supplied to the furnace main body through the chamber, so that it is not necessary to provide a separate gas supply means in the furnace main body, and it is possible to reduce the cost. Fluidization of the produced powder can be achieved.

[0014] The ninth aspect of the present invention is the first aspect of the present invention.
In the electric furnace of 3, 4, 5, 6, 7 or 8, a technique in which cooling means is provided in at least one of the furnace main body and the recovery means is applied. In this electric furnace, since the furnace body or the recovery means is cooled by the cooling means, the produced powder passing therethrough is cooled, and the produced powder discharged from the apparatus is easily handled.

[0015]

DETAILED 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 an electric furnace according to the present invention. This electric furnace has a rigid structure and is a graphitizing electric furnace for producing graphite powder (product powder). A supply means (not shown) of raw material powder is connected to the furnace main body 1 via an upper inlet 2.
A chamber 4 containing graphite powder collecting means 5 is connected to the lower part via a tubular member 3, and vertically long electrodes 6, 7 are attached to opposing side walls, respectively. In the graphitizing electric furnace, a portion above the electrodes 6 and 7 of the furnace body 1 is defined as a preheating zone a, a portion including the graphitized region 8 between the electrodes 6 and 7 is defined as a heating zone b, and a portion below the electrodes 6 and 7 is defined as a heating zone b. Is a cooling / discharge zone c.

As shown in FIG. 1, the furnace body 1 is formed in such a shape as to be narrowed toward the lower part, thereby increasing the cooling efficiency. However, whether or not the lower part is narrowed in this manner is optional. It is. Furnace body 1 may have a circular or square horizontal cross section, and may further include preheating zones a,
A cooling means such as water cooling (liquid cooling) or air cooling (gas cooling) may be provided corresponding to either the heating zone b or the cooling and discharging zone c.

As a means for supplying the raw material powder, a screw conveyor, a belt conveyor, a turntable or the like for continuously supplying the raw material powder at a predetermined flow rate is used. Is set. 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.

The tubular member 3 has an upper portion 3a provided with an inlet 3c at the upper end and arranged inside the furnace body 1, and a lower portion 3b provided with an outlet 3d at the lower end and arranged outside the furnace body 1. It consists of. The chamber 4 is installed with the lower portion 3b of the tubular member 3 inserted therein, connected to the gas supply means 9 through the discharge port 4a, and supplied with a predetermined gas. 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 use of the chamber 4 and the provision of a liquid-cooled or gas-cooled cooling means in the chamber 4 and the drive table 10 are optional.

As shown in FIGS. 1 and 2, the recovery means 5 comprises a drive table 10 disposed at a predetermined interval below the outlet 3d of the tubular member 3, and rotates the drive table 10 at a predetermined speed. A drive source 11 to be driven, a scraper 12 provided above the drive table 10 at a position distant from the tubular member 3, and a hopper 13 arranged below the drive table 10 corresponding to the scraper 12 are provided. In addition, a discharge part is comprised by the scraper 12 and the hopper 13.

As the drive table 10 rotates, the graphite powder discharged from the outlet 3d is placed in a belt shape on the drive table 10 as shown in FIG. 2, and dropped into the hopper 13 by the scraper 12. It is. Therefore, by rotating the drive table 10, the furnace body 1
Graphite powder can be continuously cut out of the powder. Further, by adjusting the rotation speed of the drive table 10 by the drive source 11, the amount of graphite powder taken out per time is set, whereby the residence time of the raw material powder (graphite powder) inside the furnace body 1 is adjusted. I have.

As shown in FIG. 3, the electrodes 6 and 7 are attached to the opposite side walls of the furnace main body 1 via an insulating material corresponding to the graphitized region 8 of the heating zone b, and a DC or AC power supply V Connected to. When a current is applied between the electrodes 6 and 7 (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 an elliptic graphitized graph having a temperature of about 2500 to 3500 ° C. A region 8 is formed and the region is graphitized. Incidentally, the heat source in the preheating zone a is obtained by heat conduction from the heating zone b. Further, the raw material powder in the preheating zone a also functions as a heat insulating layer for restricting heat dissipation from the heating zone b.

The arrangement of the electrodes 6 and 7 is not limited to the arrangement at the same horizontal level as shown in FIG. 1 or the arrangement symmetrically with respect to the center of the furnace body 1 as shown in FIG.
They may be arranged in a shifted state. Further, a plurality of sets of electrodes are arranged to face each other,
A configuration may be adopted in which any one set of electrodes is successively energized at predetermined time intervals by switching including 7. With this configuration, the graphitized region 8 is formed from an elliptical shape to a substantially circular shape.

Returning to FIG. 1, the inlet 3c of the tubular member 3 is
It is arranged immediately below the graphitized region 8. The position of the inlet 3c is set so that the raw material powder properly graphitized in the graphitization region 8, that is, the graphite powder heated in a desired temperature region is efficiently taken out.
It is determined in consideration of the angle of repose of the raw material powder (graphite powder) in the inside. However, the position of the inlet 3a can be set arbitrarily, and for example, the cooling and discharging zone c such as the bottom of the furnace body 1
May be arranged.

In this graphitizing electric furnace, a predetermined gas supplied into the chamber 4 is supplied to the furnace main body 1 via the tubular member 3.
It is configured to be blown into the graphitized region 8 inside. The predetermined gas blown into the furnace main body 1 is discharged out of the furnace main body 1 by a discharge nozzle (not shown) appropriately arranged in a preheating zone a or a heating zone b of the furnace main body 1. The gas discharged from the discharge nozzle is processed by combustion or the like.

However, the means for blowing gas into the furnace body 1 is not limited to using the chamber 4 and the tubular member 3. For example, a gas blowing nozzle is provided at a lower portion of the furnace body 1 or the like, and a predetermined gas is supplied to the furnace body 1. You may make it blow directly into. Further, the blowing position may be set not in the vicinity of the graphitized region 8 but in the cooling / discharging zone c to promote the cooling of the cooling / discharging zone c by gas blowing. In addition, whether or not gas is blown into the furnace main body 1 is optional. By blowing gas into the furnace main body 1, it is possible to set a predetermined pressure so that air does not enter into the furnace main body 1. .

In the process of heating the raw material powder in the preheating zone a or the heating zone b, an impurity gas (for example, CmHn gas) is generated from the raw material powder due to thermal decomposition or the like. The CmHn gas is condensed and liquefied when the temperature is lowered, and causes the raw material powder to be suspended on the shelf in the preheating unit a.
However, by setting the predetermined gas blown from the tubular member 3 into the furnace main body 1 so as to be heated in the graphitization region 8 and pass through the preheating zone a at a high temperature,
The impurity gas can be discharged from the furnace body 1 as a carrier gas without being condensed. This prevents the formation of tar-like substances and solids due to the condensation of the impure gas, effectively suppresses the hanging of the shelves, smoothly lowers the raw material powder to the heating zone b, and removes the tar-like substances and solids. Contamination of the inner wall of the furnace main body 1 can be effectively prevented.

When the gas supplied to the furnace body 1 passes through the tubular member 3, the cooling of the graphite powder passing through the tubular member 3 and the hanging of shelves in the tubular member 3 are suppressed, and 3 promotes fluidization of 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, the raw material powder sent from the supply means at a predetermined flow rate is supplied from the inlet 2 to the furnace body 1.
The raw material powder is lowered in the furnace main body 1 by cutting the graphite powder from the tubular member 3 at a predetermined flow rate by rotating the drive table 10 of the collecting means 5 at the same time. The temperature of the raw material powder at the time of charging is room temperature, but is not limited thereto, and the raw material powder may be heated by the supply means.

When a predetermined current and voltage are applied between the electrodes 6 and 7, the raw material powder itself is heated in the heating zone b by Joule heat according to the specific resistance of the raw material powder. In addition, the input raw material powder is supplied to the preheating zone a.
Since the preheating is performed by the heat conduction from the heating zone b, even if it is non-conductive at the charging stage, a material that becomes conductive by preheating can be used.

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 8 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 8 can be appropriately set according to the size of the furnace body 1, the change in the current and voltage between the electrodes 6 and 7, the moving speed of the raw material powder in the furnace body 1, and the graphitized region 8 Can be set similarly.

The raw material powder supplied to the preheating zone a, while being preheated in the preheating zone a, descends with the passage of time according to the amount of the graphite powder cut out by the rotation speed of the drive table 10, and becomes a graphitized region in the heating zone b. While passing through 7, it is heated and graphitized. Thereafter, the graphite powder is taken into the tubular member 3 from the inlet 3c, and then is taken out of the outlet 3c.
From d, it is placed in a belt shape on the drive table 10, dropped by the scraper 12 from the drive table 10 into the hopper 13, and sent to another device or the like. At this time, the graphite powder flows while passing through the tubular member 3 and the drive table 10.
It is cooled while placed on top.

FIG. 4 is a sectional view showing the collecting means 15. 1 to 3 and 6 to 12 are the same as those in FIG. This collecting means 15 is housed in the chamber 14 similarly to the collecting means 5 of FIG. A predetermined gas from the gas supply means 9 is supplied to the discharge port 14a in the chamber 14.
Is similar. The collection means 15
As shown in FIG.
1 in that the upper graphite powder is not dropped into the hopper but is transferred to the next drive table 16.

The collecting means 15 is a scraper (transfer means)
A drive table 16 disposed below the drive table 10 corresponding to the drive table 12; a drive source 17 for rotating the drive table 16 at a predetermined speed; a scraper 18 provided above the drive table 16; And a hopper 19 disposed below the drive table 16. In addition, a discharge unit is configured by the scraper 18 and the hopper 19.

Then, as the drive tables 10 and 16 rotate, the graphite powder discharged from the outlet 3d is transferred from the drive table 10 to the drive table 16 by the scraper 12a, and from the drive table 16 to the hopper by the scraper 18. It is dropped to 19. Therefore, the graphite powder can be continuously cut out from the furnace main body 1 by rotating the drive tables 10 and 16, and further, by adjusting the respective rotation speeds of the drive tables 10 and 16, the graphite powder per time can be cut out. The take-out amount is set, whereby the residence time of the raw material powder (graphite powder) inside the furnace main body 1 is adjusted.

In the collecting means 15, the graphite powder is exposed to the atmosphere in the chamber 14 when the graphite powder is transferred from the driving table 10 to the driving table 16, so that the cooling of the graphite powder is carried out efficiently. Cool while you are. The illustrated one uses two drive tables, but three or more drive tables may be connected. Also, whether or not the chamber 14 is used,
It is optional whether or not to provide a liquid cooling or gas cooling means.

FIG. 5 is a sectional view showing the collecting means 21. As shown in FIG. In this collecting means 21, the upper part 3 is used as the tubular member 3.
a alone is used, and the lower end opening of the upper part 3a serves as an outlet for graphite powder. The chamber 20 is installed with the lower part of the furnace main body 1 inserted therein, and is connected to the gas supply means 9 via a discharge port 20a.

As shown in FIGS. 5 and 6, the collecting means 21 is installed at the lower end of the tubular member 3 in a substantially abutting state, and an opening 22a having a diameter corresponding to the tubular member 3 is formed on the same circumference. A rotating plate 22 provided at intervals, a driving source 23 for intermittently rotating the rotating plate 22, a pipe-shaped case 24 provided below each opening 22a and having a lid 24a openable at the lower end thereof; , Hopper 2 provided below case 24
5 and an operation unit 26 for opening the lid 24a when the case 24 is positioned on the hopper 25. In addition,
The hopper 25 and the operation unit 26 constitute a discharge unit.

After the graphite powder is filled into the case 24 from the tubular member 3 through the opening 22a, the rotating plate 22
The graphite powder is continuously cut out from the furnace body 1 by repeating the intermittent operation of the rotating plate 22 such that the case rotates to fit the next case 24 to the tubular member 3.
When the cover 4 is located above the hopper 25, the lid 24a is opened by an instruction from the operation unit 26 to drop the graphite powder into the hopper 25. Further, by adjusting the rotation speed of the rotating plate 22 by the driving source 23, the amount of the graphite powder taken out per time is set, whereby the residence time of the raw material powder (graphite powder) inside the furnace body 1 is adjusted. I have.

A member for opening and closing the lower end of the tubular member 3 may be provided, and the amount of the graphite powder taken out may be adjusted by adjusting the opening amount of this member. Further, although the lower portion of the case 24 is opened and closed by the lid portion 24a, the present invention is not limited to this, and various mechanisms capable of opening and closing the lower portion of the case 24 can be applied. Any mechanism for instructing opening can be applied. Further, the hopper 25 may be installed at a plurality of locations, and the graphite powder may be dropped into any of the hoppers 25.

In the collecting means 21, the graphite powder is filled in the case 24 and cooled before moving to the hopper 25. Therefore, the tubular member 3 is compared with the graphitizing electric furnace shown in FIGS. The lower side 3b becomes unnecessary. Therefore, the height of the entire apparatus can be reduced by the lower portion 3b, and the overall apparatus can be made compact. However, it is optional whether the chamber 20 is used or whether a liquid-cooled or gas-cooled cooling unit is provided in the chamber 20.

FIG. 7 is a sectional view showing the collecting means 28. As shown in FIG. 1 and 4, the chamber 27 is installed with the lower side 3b of the tubular member 3 inserted therein, and is connected to the gas supply means 9 via a discharge port 27a. .

The collecting means 28 is provided at the outlet 3d of the tubular member 3.
A screw conveyor 29 having one end 29a disposed below the screw conveyor 29, a drive source 30 for rotating the screw conveyor 29 at a predetermined speed, and a hopper 31 disposed below the other end 29b of the screw conveyor 29. ing. Note that the hopper 31 serves as a discharge unit.

Then, as the screw conveyor 29 rotates, the graphite powder discharged from the outlet 3d is transferred from the end 29a to the end 29b, and the graphite powder is discharged from the end 29b.
From the hopper 31. Therefore, graphite powder can be continuously cut out from the furnace main body 1 by rotating the screw conveyor 29. Further, by adjusting the rotation speed of the screw conveyor 29 by the driving source 30, the amount of graphite powder taken out per time is set, and thereby the residence time of the raw material powder (graphite powder) inside the furnace body 1 is adjusted. I have.

In the collecting means 28, cooling is performed while the graphite powder is transferred by the screw conveyor 29. Although the illustrated one uses the screw conveyor 29, the invention is not limited to this, and for example, a belt conveyor may be used. In this case, the removal amount of the graphite powder is adjusted by the belt moving speed. It is optional whether the chamber 27 is used or whether the chamber 27 is provided with a liquid-cooled or gas-cooled cooling means.

FIG. 8 is a sectional view showing an example of the cooling means applied to the tubular member 3 of the furnace body 1 and the case 24 of the collecting means 21 shown in FIG. FIG. 8 shows an example of application to the lower portion 3b of the tubular member 3. In the lower portion 3b, the central passage 32 is used as a passage for the graphite powder, and double passages 33 and 34 are formed outside the central passage. The passages 33 and 34 are connected to coolant supply sources 34 and 35, respectively, and cool the graphite powder passing through the central passage 32 by passing the coolant through the passages 33 and 34.

A cooling gas such as nitrogen gas which does not react with oxygen is used as a refrigerant passing through the inner passage 33, and a cooling water is used as a refrigerant passing through the outer passage 34. The passage of the cooling gas through the passage 33 and the passage of the cooling water through the passage 34 as described above, even when the refrigerant leaks into the central passage 32 due to a crack in the pipe while improving the cooling efficiency by the cooling water. This is to prevent an inadvertent reaction between the refrigerant and the graphite powder. However, instead of this, both passages 33,
A cooling gas or cooling water may be passed through 34, or cooling water may be passed through inner passage 33 and cooling gas may be passed through outer passage 34.

As described above, in this graphitizing electric furnace, the raw material powder is taken out of the furnace main body 1 as graphite powder in the graphitization region 8 while descending inside the furnace main body 1.
High quality graphite powder can be efficiently and continuously taken out by the recovery means 5, 15, 21 or 28 while the raw material powder is continuously charged by the supply means, and the productivity is high without storing the raw material powder for a long period of time. A continuous production process of graphite powder can be realized. Furthermore, because of the continuous manufacturing process, the power consumption is small (about one third of the conventional furnace).
), And the power supply equipment can be reduced in size and cost.

Further, the entire 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. Moreover, the collecting means 5,
The removal of the graphite powder into the furnace main body 1 can be mechanized by 15, 21, or 28, and automation of the apparatus can be easily performed.

Further, since the residence time of the raw material powder in the graphitization region 8 is set by adjusting the supply amount of the raw material powder and the recovered amount of the graphite powder, the residence time required for graphitization can be easily set by the supply amount of the raw material powder. Thus, optimization of production efficiency in a continuous manufacturing process can be reliably performed with simple control.

Further, since the inlet 3c of the tubular member 3 is disposed near the graphitized region 7, the graphitized region 8, ie, the graphite powder heated at the desired temperature region is efficiently taken into the tubular member 3. By taking the graphite powder out of the furnace main body 1, the quality can be made uniform. In addition, the graphite powder is appropriately cooled while passing through the tubular member 4, and the subsequent processing of the graphite powder taken out of the furnace main body 1 is performed. It will be easier.

By the way, in the furnace body 1 shown in FIG. 1, the graphite powder around the upper part 3a of the tubular member 3 stays without being discharged as it is. It prevents contamination with different materials and also functions as a heat insulator. Further, the shapes, combinations, and the like of the respective constituent members shown in the above-described embodiment are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention. Furthermore, the illustrated one is a graphitizing electric furnace for producing graphite powder, but the electric furnace according to the present invention can also be applied to a powder firing furnace for metal or conductive ceramics.

[0052]

As described above, in the electric furnace according to the first aspect, since the generated powder in the furnace main body is cut out by the rotation of the drive table, the electric powder can be continuously taken out while rotating. By changing the speed, the amount taken out per unit time can be adjusted, whereby the residence time of the produced powder in the furnace body can be set. Further, since the produced powder is cooled while being placed on the drive table, the subsequent handling of the produced powder is facilitated.

In the electric furnace according to the present invention, since the generated powder is transferred by connecting a plurality of driving tables, the generated powder is exposed to the atmosphere when moving to the next driving table as well as on each driving table. As a result, the produced powder can be cooled efficiently.

In the electric furnace according to the third aspect, since the generated powder is once stored in the case and then transferred to the discharge section, the generated powder can be cooled in the case, and furthermore,
Since a part of the discharge path of the generated powder discharged from the furnace body can be replaced by the length of the case, the height of the apparatus can be reduced, and the installation space can be reduced.

In the electric furnace according to the fourth aspect, since the transfer of the produced powder from the case to the discharge section is performed by opening the lid, the produced powder can be easily and reliably transported.
Even if there are many cases, it is possible to cope with it, and it is possible to easily cope with the automation of the device.

In the electric furnace according to the fifth aspect, since the powder produced in the furnace body is cut out by driving the conveyor,
By changing the driving speed, the amount of extraction per unit time can be adjusted while enabling continuous extraction of the generated powder, whereby the residence time of the generated powder in the furnace body can be set. In addition, subsequent handling of the generated powder is facilitated because the generated powder is cooled while being transported on the conveyor.

In the electric furnace according to the sixth aspect, since a belt conveyor or a screw conveyor is applied as the conveyor, the driving speed can be easily controlled, and the cut-out amount of the generated powder can be easily adjusted.

In the electric furnace according to the seventh aspect, by supplying a predetermined gas into the chamber, it is possible to prevent combustion of the produced powder and to efficiently cool the produced powder being transferred.

In the electric furnace according to the eighth aspect, since the predetermined gas is supplied to the furnace main body through the chamber, it is not necessary to provide a separate gas supply means in the furnace main body, and the cost can be reduced. Fluidization of the produced powder can be achieved by flowing the predetermined gas.

In the electric furnace according to the ninth aspect, since the furnace body or the recovery means is cooled by the cooling means, the generated powder passing therethrough is cooled, and the handling of the generated powder discharged from the apparatus is facilitated. ing.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the drive table shown in FIG.

FIG. 3 is a sectional view taken along the line AA in FIG. 1;

FIG. 4 is a cross-sectional view showing another embodiment of the collecting means.

FIG. 5 is a sectional view showing another embodiment of the collecting means.

6 is a plan view of the rotating plate shown in FIG.

FIG. 7 is a cross-sectional view showing another embodiment of the collecting means.

8A and 8B show an application example of the cooling means, in which FIG. 8A is a longitudinal sectional view, and FIG. 8B is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace main body 3 Tubular member 3d Outlet 4,14,20,27 Chamber 9 Gas supply means 10,16 Drive table 12,18 Scraper (discharge part) 12a Scraper (transfer means) 13,19,25,31 Hopper (discharge) Part) 24 case 24a lid part 26 operation part (discharge part) 29 screw conveyor 29a, 29b end part 33, 34 passage (cooling means) 35, 36 refrigerant supply source (cooling means)

Continuing from the front page (72) Inventor Shiyasu Matsuda 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Ishikawashima-Harima Heavy Industries, Ltd. Inside the Yokohama Engineering Center (72) Inventor Shigeki Iijima Shinnaka, Isogo-ku, Yokohama-shi, Kanagawa No. 1 Haramachi Ishi Kawashima Harima Heavy Industries, Ltd. Yokohama Engineering Center (72) Inventor Tomotoshi Mochizuki 1 Shinnakahara-cho, Isogo-ku, Yokohama, Kanagawa Prefecture Ishi Kawashima Harima Heavy Industries, Ltd.Technical Research Institute (72) Inventor Koichi Fujita Ishikawashima Harima Heavy Industries Co., Ltd.

Claims (9)

[Claims] 1. An electric furnace wherein a raw material powder charged from an upper part of a furnace body is subjected to a heat treatment, and a generated powder after heating is continuously taken out from a lower part of the furnace body by a collecting means. The means is provided with a drive table disposed below the product powder outlet of the furnace main body and mounted and rotated with the product powder, and a discharge unit for taking in the product powder on the drive table. Furnace. 2. A plurality of the driving tables are arranged so as to be connected to each other, and between these driving tables, transfer means for transferring the generated powder placed on the previous driving table to the next driving table is provided. Claim 1 characterized by the following:
An electric furnace as described. 3. An electric furnace wherein a raw material powder supplied from an upper part of a furnace body is subjected to a heat treatment, and a produced powder after heating is continuously taken out from a lower part of the furnace body by a collecting means. The means comprises: a plurality of cases each of which moves so as to be connected to a product powder outlet of the furnace body and stores product powder from the furnace body; and a discharge unit that takes in the product powder in the case. An electric furnace, comprising: 4. The electric furnace according to claim 3, wherein the case includes a lid that can be opened at a lower portion, and the discharge unit includes an operation unit that opens the lid. 5. An electric furnace wherein a raw material powder charged from an upper part of a furnace body is subjected to a heat treatment, and a generated powder after heating is continuously taken out from a lower part of the furnace body by a collecting means. The means includes a conveyor having one end connected to a product powder outlet of the furnace main body and transferring generated powder from the furnace main body, and a product powder connected and transferred to the other end of the conveyor. An electric furnace, comprising: a discharge unit for taking in the electric furnace. 6. The electric furnace according to claim 5, wherein the conveyor is a belt conveyor or a screw conveyor. 7. The electricity as claimed in claim 1, further comprising a chamber accommodating said recovery means, and gas supply means for supplying a predetermined gas to said chamber. Furnace. 8. Connecting the furnace body and the chamber,
The electric furnace according to claim 7, wherein a predetermined gas from the gas supply means is supplied to the furnace main body through the chamber. 9. The electric furnace according to claim 1, wherein at least one of the furnace main body and the recovery means is provided with a cooling means.