JPS5964512A - Graphitization of carbonaceous formed article - Google Patents

Abstract

PURPOSE:To obtain a graphitized product having uniform quality in high electrical power efficiency, in the resistance-heating graphitization of formed carbon articles arranged in plural rows in a graphitization furnace, by adjusting the electrical resistance of each row of the article to eliminate the voltage difference between rows. CONSTITUTION:A number of the formed carbon articles 5 to be graphitized are made to contact with each other and placed in the graphitization furnace 4, and coke powder 7 is filled between the articles and the furnace as a packing material. Both terminals of each row of the formed carbon articles are connected with the terminal electrodes 3, 6, and the row of the formed carbon articles connected in series is electrified with the electrical source 1. The article is heated and graphitized at an extremely high temperature by the Joule heat. In the above process, the temperature difference among the rows of the formed carbon articles is detected as a potential difference by the potential detector 10, and the pressure of the head 81 pressing the terminal electrode 6 is controlled by the hydraulic cylinder 8 according to the potential difference. The electrical resistance of each row can be made uniform, and all the rows are heated uniformly. Consequently, the graphitized product having uniform quality can be obtained in high electrical power efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for graphitizing a carbonaceous molded body.

Graphitization of the carbonaceous compact is carried out by packing the compact together with a bleeder (coke powder) as a backing material in a furnace and heating it with electricity. In this case, the carbonaceous molded bodies to be graphitized are packed in a furnace in one row per furnace, regardless of their size. Therefore, depending on the size of the molded object, not only is production efficiency and heating efficiency poor, but
There is a fluctuation in the amount of backing material that is packed together with the compact, and the efficiency of packing and unloading the compact is also reduced.

The present invention has been made in view of the above-mentioned problems, with the object of providing an improved graphitization method capable of increasing the productivity per furnace and improving the power source unit.

According to the present invention, the object is to arrange the molded bodies in a plurality of rows in a furnace and heat them with electricity, measure the potential difference in each row, and apply an electric potential to each row so that the potential difference in each row becomes the same. This can be achieved by adjusting the pressure.

The method according to the present invention will be explained below with reference to the drawings.
Although the figure shows a case where graphitization is performed using a U-shaped furnace, the present invention can also be applied to a single-shaped furnace, and is not limited to this example in any way.

The carbonaceous molded bodies 5, which are objects to be graphitized, are placed in such a state that one end of each row is in contact with a fixed terminal electrode B connected to the power supply device 1 with a conductor 2, and the other end is in contact with a movable terminal electrode B, respectively. Together with the backing material 7, they are arranged in two rows per furnace and packed in the furnace. Thus, the molded bodies 5 in each row are placed in a state where their end surfaces are in contact with each other.

The movable terminal electrodes 6 in the same row are connected to each other by a conductor 9, and are movable in the horizontal direction. This movable terminal ζ terminal electrode 6 is pressurized by a hydraulic cylinder 8 connected to a hydraulic unit 11 so that it can follow the horizontal stress of the compact 5 due to heating and apply a predetermined pressure to the compact 5 in each row. They are in contact with the heads 81, respectively.

The hydraulic unit 11 is connected to a device 10 that detects and measures the potential difference between the rows of imprinted bodies 5, and increases and decreases the pressure applied by the cylinder 8 based on signals from the device 1o.
It can be operated so that the potential difference between columns is the same.

In such an apparatus configuration, if the compact 5 is placed in the furnace 4 and electricity is started with each moving terminal electrode 6 pressurized, the compact 5 will be heated by Joule heat generated by its electrical resistance. , and graphitized by raising the temperature to the required temperature. During this graphitization process, the electrical resistance of each row does not necessarily match, and differences occur in the heating rate and temperature for each row. The difference is detected by the device 10 as a potential difference between the columns, so based on this signal, the hydraulic unit 11 adjusts the pressure applied by the cylinder 8 so that the potential difference value between each column is the same, and reduces the resistance in the furnace. Control. As a result, the molded bodies 5 in each row are heated uniformly, and a product with stable quality can be obtained.

In this example, the molded bodies 5 are arranged in two rows in the horizontal direction, but even if they are arranged in the vertical direction, the same method can be implemented by arranging the pressurizing means accordingly.

As is clear from the above description, since the method according to the present invention graphitizes compacts by arranging them in multiple rows per furnace, it is possible to increase the production amount per furnace. In the graphitization of small-sized compacts, not only can the power supply device be used more effectively compared to the -row arrangement, but the ratio of the cross-sectional area of the compacts packed in the furnace to the cross-sectional area of the furnace is improved, resulting in better thermal efficiency. The power source unit will improve. However, since the resistance inside the furnace is controlled by detecting the potential difference between the columns and adjusting the pressurizing force, there are advantages such as uniform heating and the ability to obtain products with stable quality.

[Brief explanation of drawings]

The figure is a schematic representation of an example of an apparatus for carrying out the method according to the invention. 1: Power supply device, 6: Fixed terminal electrode, 4: Graphitization furnace, 5: Carbonaceous molded body, 6: Moving terminal electrode, 8: Hydraulic cylinder, 81: Pressure head, 10: Potential difference detection device, 11: Hydraulic ↓knit. 7

Claims (1)

[Claims] 1. In the method of arranging a carbon molded body between electrodes and graphitizing it by heating it with electricity, the carbon molded body is arranged in multiple rows so that each row can be pressurized, energized, and the potential difference in each row is measured. A method for graphitizing a carbonaceous compact, characterized in that the pressure horns applied to each row are adjusted so that the potential difference in each row is the same.