JP6873466B2 - Carbide manufacturing method - Google Patents

Description

The present invention relates to a method for producing a carbide by carbonizing an rush. More specifically, the present invention relates to a method for producing a carbide having a shortened carbonization treatment time and excellent energy saving.

Carbides such as herbs and wood are used as gas adsorbents such as hydrogen sulfide and ammonia. For example, Patent Document 1 discloses a method of using a carbide of rush used for a tatami mat as a gas adsorbent such as hydrogen sulfide and ammonia. Further, Patent Document 1 also discloses a method of heating rush to 400 to 500 ° C. in an inert gas atmosphere to obtain rush carbide.

As a method of heating herbs, woods, etc. to obtain carbides, as disclosed in Patent Document 1, generally, a furnace such as an electric furnace is used, and the temperature is 400 to 800 ° C. for 3 hours. Heat. In addition, carbonization is performed in an inert gas atmosphere so as not to ignite.

As another method for producing carbides, a method of heating on a metal heating plate heated from below is known. For example, Patent Document 2 discloses a method in which granules of corn hump are placed on a heating plate formed in a mountain-shaped cross section and carbonized over about 15 hours. Further, the carbonization temperature is set to 600 to 700 ° C., and in order to avoid complete combustion, it is appropriately cut back and steamed.

Japanese Unexamined Patent Publication No. 2001-64653 Japanese Unexamined Patent Publication No. 2008-81332

According to the conventional method for producing carbides of rush, since it is heated for a long time, a large amount of fuel and electric power for heat supply are consumed. In addition, the manufacturing time is long and the workability is poor.
Therefore, an object of the present invention is to provide a method for producing a carbide in which the production time is shortened while reducing the energy consumption for heat supply by shortening the carbonization treatment time.

As a result of diligent studies on the above problems, the present inventor is a method for producing carbides of Igusa, which is heated in a conventional furnace by rolling the Igusa on a heating portion heated to a temperature of 200 to 500 ° C. The present invention was completed by finding that carbides can be obtained in a shorter time than in the above.
Specifically, it is the following method for producing carbides.

The method for producing a carbide for solving the above problems includes a heating step of heating the igusa by bringing the igusa into contact with a heating portion heated to a temperature of 200 to 500 ° C., and placing the igusa on the heating portion. The heating step is characterized in that the time of the heating step is 30 minutes or less.

According to this carbide production method, since the igusa is in contact with the heating part heated to a temperature of 200 to 500 ° C., heat is efficiently transferred from the heating part to the igusa, and the carbide is heated in a conventional furnace. Carbide can be obtained in a short time as compared with. Therefore, energy consumption for heat supply is reduced. Further, the temperature of the heating unit is as low as 200 to 500 ° C., and further energy saving can be realized. In addition, the production time is shortened, and it is possible to provide a method for producing a carbide having excellent workability.

The rush has an elongated cylindrical outer cylinder portion and cotton-like fibers inside the outer cylinder portion, and the carbide of the cotton-like fibers inside the rush has an excellent effect in cesium adsorption ability and the like. When the carbonization treatment of rush is performed at a high temperature, a decrease in their effects is observed. It is presumed that this is due to the disappearance of the cotton-like fibers inside due to the treatment at high temperature. However, according to the method for producing a carbide of the present invention, the carbide can be carbonized at a low temperature, so that a carbide having an excellent effect in cesium adsorption ability and the like can be obtained.

Further, as one embodiment of the present invention, in the method for producing a carbide, the heating step is characterized in that the temperature of the heating portion is 200 to 350 ° C.
According to this feature, carbonization can be performed at a low temperature, so that an excellent effect is exhibited from the viewpoint of energy saving.

Further, as one embodiment of the present invention, in the method for producing a carbide, the heating step is characterized in that the rush and air are in contact with each other.
According to this feature, carbonization proceeds faster by heating in a state where the rush and air are in contact with each other, so that carbonization can be performed in a shorter time.

According to the method for producing a carbide of the present invention, it is possible to provide a method for producing a carbide in which the production time is shortened while the carbonization treatment time is shortened and the energy consumption for heat supply is reduced.

Further, according to the method for producing carbides of the present invention, carbides having a weak structure such as cotton-like fibers inside the rush can be obtained. As a result, it is possible to obtain a carbide of rush, which is a carbide of rush and has a carbide of cotton inside.

It is the schematic explanatory drawing of the carbonization processing apparatus used in the method of manufacturing the carbide of the 1st Embodiment of this invention. It is the schematic explanatory drawing of the carbonization processing apparatus used in the method of manufacturing the carbide of the 2nd Embodiment of this invention. It is the schematic explanatory drawing of the carbonization processing apparatus used in the method of manufacturing the carbide of the 3rd Embodiment of this invention. It is a figure which shows the Raman spectrum of the rush carbide (sample 1) of Example 1 which was carbonized at the temperature of a heating part of about 250 degreeC. It is a figure which shows the Raman spectrum of the rush carbide (sample 2) of Example 2 which was carbonized at the temperature of a heating part of about 450 degreeC. It is a figure showing the Raman spectrum of the rush carbonized product of Comparative Example 1 carbonized by the carbonization temperature of 480 ° C. and the carbonization treatment time of 180 minutes using an electric furnace. It is a figure which shows the Raman spectrum of the rush carbide of Comparative Example 2 carbonized at a carbonization temperature of 300 degreeC using an electric furnace. 7 (A) to 7 (D) show Raman spectra of rush carbonized products treated with carbonization treatment times of 10 minutes, 20 minutes, 30 minutes, and 40 minutes, respectively. It is a figure which shows the Raman spectrum of the rush carbide of Comparative Example 3 carbonized at a carbonization temperature of 350 degreeC using an electric furnace. 8 (A) to 8 (D) show Raman spectra of rush carbonized products treated with carbonization treatment times of 10 minutes, 20 minutes, 30 minutes, and 40 minutes, respectively. It is a figure which shows the result of the thermogravimetric analysis of a rush. FIG. 9A is a diagram showing a change in sample weight (TG). FIG. 9B is a diagram showing the rate of decrease in sample weight (DTG).

The method for producing a carbide of the present invention includes a heating step of heating the carbide by bringing the carbide into contact with a heating portion heated to a temperature of 200 to 500 ° C., and rolling of the carbide on the heating portion. It is provided with a step, and treats igusa as a carbide.

(Carbide)
The carbide to be carbided in the present invention is not particularly limited as long as it forms a carbide by heating. For example, herbs such as igusa and rice straw, wood such as cedar chips, leaves of wood, palm husks, paper, plastic, dried sludge and the like can be mentioned. The shape is not particularly limited, but is preferably rod-shaped or granular from the viewpoint of efficiently transferring heat from the heating portion. In the case of a rod shape, the maximum diameter or the maximum side length of the cross section is preferably 5 cm or less, more preferably 3 cm or less, and particularly preferably 1 cm or less. In the case of granularity, the maximum diameter is preferably 20 cm or less, more preferably 10 cm or less, and particularly preferably 5 cm or less.

The water content of the carbide is not particularly limited, but is preferably 80% by mass or less, more preferably 50% by mass or less, further preferably 30% by mass or less, and particularly preferably 15% by mass or less. .. The moisture content of the material to be carbide can be adjusted by a known drying treatment such as sun-drying or heat-drying.

The carbided object suitable for the method for producing a carbide of the present invention is a leaf or herb of a tree, and a particularly suitable herbaceous material is rush.
Rush is a plant of the Rushaceae family, and is mainly used for tatami mats and goza. The raw material for rush is not particularly limited, but from the viewpoint of effective use of waste, it is preferable to use rush waste generated during the production of tatami mats, goza and the like.

The rush stem has an elongated cylindrical outer cylinder and cotton-like fibers (hereinafter referred to as "cotton") inside the outer cylinder. The carbonized material obtained by carbonizing the cotton portion exhibits peculiar adsorption performance such as cesium adsorption ability. When this cotton portion is carbonized at a high temperature, the cotton-like fibers inside disappear and the adsorption performance deteriorates. Therefore, it could not be obtained by the conventional carbonization treatment method in which carbonization treatment is performed at a high temperature for a long time. However, according to the method for producing carbides of the present invention, carbonization treatment can be performed at a low temperature in a short time, so that carbides of cotton can be obtained.

When carbonizing the rush, it is preferable to cut the raw material of the rush, and the length to be cut is preferably 0.1 to 100 mm in the longitudinal direction, more preferably 0.2 to 50 mm, and further preferably 1 to 30 mm. Is particularly preferable. As a result, heat is efficiently transferred from the heating portion, so that the effect of the present invention can be further exerted.

Further, when carbonizing the rush, the whole plant may be carbonized or only the stem may be carbonized. Further, the outer cylinder portion and the cotton portion of the stem portion may be separately carbonized.

Further, as long as it is a leaf of a tree, it may have the same shape or may be cut. When cutting, the maximum side length or maximum diameter is preferably 20 cm or less, more preferably 10 cm or less, and particularly preferably 5 cm or less.

Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that this embodiment does not limit the present invention.

[First Embodiment]
FIG. 1 is a schematic explanatory view of a carbide treatment apparatus 10 used in the method for producing a carbide according to the first embodiment of the present invention.
The carbonization treatment device 10 includes a heating unit 2 on which the object to be carbonized 1 is placed, a heat supply unit 3 for supplying heat to the heating unit 2, and a temperature sensor 4 for measuring the surface temperature of the heating unit 2.

(Heating process)
The heating step is a step of heating the carbide 1 by bringing the carbide 1 into contact with the heating unit 2 heated to a temperature of 200 to 500 ° C.
By bringing the carbide 1 into contact with the heating unit 2, the carbide 1 can be efficiently heated, so that the carbide can be produced in a short time.

As a method of bringing the carbided portion into contact with the heated portion, the heated portion may be brought into contact with the carbided portion after being heated to 200 to 500 ° C. It may be heated to ° C. From the viewpoint of shortening the time of the heating step, it is preferable to contact the carbided portion after heating the heated portion to 200 to 500 ° C.

The temperature of the heating unit 2 is 200 to 500 ° C, preferably 200 to 400 ° C, and particularly preferably 200 to 350 ° C. By lowering the temperature of the heating unit 2, combustion due to ignition can be suppressed even when heating is performed in a state where the carbide 1 and air are in contact with each other. In addition, carbides having peculiar adsorption performance such as cesium adsorption ability can be obtained.

The state in which the carbide 1 is in contact with air means an air atmosphere, that is, an air atmosphere containing about 10 to 30% by volume of oxygen. The configuration for forming such a state is not particularly limited, but for example, as shown in FIG. 1, a configuration in which the upper part of the heating unit 2 is opened to heat the object to be carbonized 1 or air is blown into a closed carbonization chamber. Examples thereof include a configuration in which heating is performed while supplying. When the object to be carbonized 1 is heated in contact with air, the carbonization treatment is promoted, which has the effect of shortening the carbonization treatment time.

Further, it may be heated in an atmosphere of an inert gas such as nitrogen, carbon dioxide or argon gas. The configuration for forming such a state is not particularly limited, and examples thereof include a configuration in which the object to be carbide 1 is covered with a lid, a configuration in which an inert gas is supplied, and the like. By setting the atmosphere in an inert gas atmosphere, it is possible to reduce the risk of ignition when heated to 350 ° C. or higher.

The time of the heating step is not particularly limited, but is preferably 180 minutes or less, more preferably 60 minutes or less, still more preferably 45 minutes or less, and particularly preferably 30 minutes or less from the viewpoint of energy saving. The guideline for the end of the heating process can be determined by the disappearance of smoke.

The heating member 2 may be made of any material as long as it can be heated to 200 to 500 ° C., but a metal such as iron is preferable from the viewpoint of heat transfer efficiency. Further, the shape is not particularly limited, and examples thereof include a flat plate shape, a prismatic shape, a cylindrical shape, and a spherical shape. In addition, heating members such as dish-shaped, bowl dish-shaped, cylindrical, and rectangular cylinders, rotary pan-shaped heating members that rotate dish-shaped, bowl-shaped, and other heating members, and heating members such as cylindrical and rectangular cylinders. A rotating drum type or the like to be rotated may be used.

Further, the time of the heating step may be adjusted by forming the heating unit 2 into a belt conveyor shape and adjusting the length and transfer speed of the belt conveyor. According to this configuration, carbides can be continuously produced.

The heat supply unit 3 has a configuration for supplying heat to the heating unit 2, and examples thereof include a burning wood, a gas burner, and an electric heater.

The temperature sensor 4 has a configuration for measuring the surface temperature of the heating unit 2, and is used for controlling the surface temperature of the heating unit 2. By measuring the surface temperature of the heating unit 2, it is possible to suppress ignition or the like due to a sudden temperature rise.

(Rolling process)
The rolling step is a step of rolling the carbide 1 on the heating unit 2. By rolling the material to be carbonized 1 on the heating unit 2, the material to be carbonized 1 can be uniformly carbonized.
Examples of the configuration for rolling the carbide 1 include a configuration in which the heating unit 2 is shaken up and down or left and right, a configuration in which a rotary pan and a rotary drum are rotated, and the like. In addition, the carbide 1 may be rolled using a stirrer such as a spatula.

[Second Embodiment]
FIG. 2 is a schematic explanatory view of a carbide treatment apparatus 11 used in the method for producing a carbide according to the second embodiment of the present invention.
The carbonization treatment device 11 has a configuration in which the carbonization treatment device 10 used in the method for producing carbonized material of the first embodiment is further provided with a lid 5 for covering the material to be carbonized 1.

In the method for producing carbides of the second embodiment, in the heating step, the carbide 1 is covered with a lid 5 to form an inert gas atmosphere (oxygen concentration less than 10% by volume). According to this method, when the heating unit 2 is heated to 350 to 500 ° C., combustion of the carbide 1 due to ignition can be suppressed.

[Third Embodiment]
FIG. 3 is a schematic explanatory view of a rotary pan type carbide treatment apparatus 12 used in the method for producing a carbide of the third embodiment of the present invention.
The carbonization treatment device 12 is configured such that a bowl dish-shaped heating portion 2 having an opening 6 is installed in an inclined manner and rotates about the center of the bottom portion of the bowl dish-shaped heating portion 2.

In the method for producing carbides according to the third embodiment, in the rolling step, the bowl dish-shaped heating unit 2 is rotated to roll the carbide 1 placed inside. In order to perform more efficient rolling, a return member such as a baffle plate may be provided on the inner wall of the bowl dish-shaped heating portion 2. Since the bowl dish-shaped heating portion 2 has an opening 6, the object to be carbide 1 is in contact with air.

[Manufacturing of carbide]
(Example 1)
A rush carbide was produced by the method for producing a carbide according to the first embodiment, using a dried rush cut into 3 to 10 mm as a carbide. The temperature of the heating part was about 250 ° C., and the time of the heating step was about 5 minutes. This rush carbide is referred to as "Sample 1". The Raman spectrum was measured for Sample 1, and the results are shown in FIG.

(Example 2)
A rush carbide was produced by the method for producing a carbide of the second embodiment described above, using a dried rush cut into 3 to 10 mm as a carbide. The temperature of the heating part was about 450 ° C., and the time of the heating step was about 10 minutes. This rush carbide is referred to as "Sample 2". The Raman spectrum was measured for Sample 2, and the results are shown in FIG.

(Example 3)
Using the leaves (undried matter) of the maki tree as the carbide, the carbide of the leaves of the maki tree was produced by the method for producing the carbide of the first embodiment described above. The temperature of the heating unit was about 280 ° C., and the heating process time was about 30 minutes. The carbide of the leaves of this maki tree is referred to as "MK-1". Raman spectra were measured for MK-1.

(Example 4)
Using the leaves (undried matter) of the maki tree as the carbide, the carbide of the leaves of the maki tree was produced by the method for producing the carbide of the first embodiment described above. The temperature of the heating unit was about 320 ° C., and the heating process time was about 15 minutes. The carbide of the leaves of this maki tree is referred to as "MK-2". Raman spectra were measured for MK-2.

(Comparative Example 1)
A rush cut into 3 to 10 mm was used as a carbide, and was carbonized in an argon atmosphere at a carbonization temperature of 480 ° C. for 180 minutes to produce a rush carbide. This rush carbide is referred to as "480-180". Raman spectra were measured for 480-180 and the results are shown in FIG.

(Comparative Example 2)
A rush cut into 3 to 10 mm was carbonized using an electric furnace at a carbonization temperature of 300 ° C. in an argon atmosphere. The carbonization treatment time was set to 10 minutes, 20 minutes, 30 minutes, and 40 minutes, and the Raman spectrum was measured for the rush carbonized product at each carbonization treatment time. The result is shown in FIG. The sample name of each carbonized product is represented by "300- (carbonization time)".

(Comparative Example 3)
A rush cut into 3 to 10 mm was carbonized using an electric furnace at a carbonization temperature of 350 ° C. in an argon atmosphere. The carbonization treatment time was set to 10 minutes, 20 minutes, 30 minutes, and 40 minutes, and the Raman spectrum was measured for the rush carbonized product at each carbonization treatment time. The result is shown in FIG. The sample name of each carbonized product is represented by "350- (carbonization time)".

(Comparative Example 4)
Carbide of the leaves of the maki tree was produced by carbonizing the leaves (undried matter) of the maki tree using an electric furnace in an argon atmosphere at a carbonization temperature of 280 ° C. for 30 minutes. The carbide of the leaves of this maki tree is referred to as "MK furnace 280-30". Raman spectra were measured for the MK furnace 280-30.

(Comparative Example 5)
Using a maki tree leaf (undried product) as a carbide, carbonization treatment was performed for 60 minutes at a carbonization temperature of 280 ° C. in an argon atmosphere using an electric furnace to produce a carbonized product of the maki tree leaf. The carbide of the leaves of this maki tree is referred to as "MK furnace 280-60". Raman spectra were measured for the MK furnace 280-60.

[Raman spectrum measurement of carbides]
The measurement conditions of the Raman spectrum are as follows.
Measuring instrument: Microlaser Raman spectroscopic analyzer (Renishaw Co., Ltd. "in Via Reflex")
Laser: YAG (doubling), 532 nm
Output: 50mW dimmed to 5% Objective lens: 100 times Total number of times: 5 times Measurement range: 800-2000cm ^-1
Exposure time: 100s

For each sample of Examples and Comparative Examples, the area ratio of the peak (D band) around ^{1400 cm -1} derived from the sp3 hybrid orbital and the peak (G band) around ^{1600 cm -1 derived from the sp2 hybrid orbital (G band).} I _D / _IG ) was calculated and summarized in Table 1 below.

Looking at the Raman spectrum of the fully carbonized rush carbide (sample name: 480-180) using an electric furnace, D band and G band were observed, and the area ratio was 2.6.
In addition, D band and G band were also observed in the Raman spectra of Sample 1 (Example 1) and Sample 2 (Example 2), and their area ratios were 2.4 and 2.5, respectively. That is, according to the method for producing carbides of Examples 1 and 2, the sample "480-180" sufficiently carbonized in an electric furnace even if it is carbonized within a heating part temperature of 200 to 500 ° C. and a heating process time of 20 minutes or less. It can be seen that the same carbide as can be obtained.

Next, in Comparative Examples 2 and 3, a rush carbonized product which was carbonized using an electric furnace at a carbonization treatment temperature of 300 ° C. and 350 ° C. and a carbonization treatment time of 10 to 40 minutes was examined. As a result, at 300 ° C., sufficient peaks were not formed in the D band and the G band even after heating for 40 minutes. Further, at 350 ° C., when heated for 40 minutes, the area ratio of the D band and the G band became the same as that of the samples 1 and 2, but the half width of the D band was slightly larger than that of the samples 1 and 2, and the heating time was insufficient. It is admitted that there is.

From the above results, in Example 1 treated at a heating part temperature of about 250 ° C. and a heating process time of about 5 minutes, rush carbide was obtained at a lower temperature and in a shorter time than in Comparative Examples 2 and 3 which were carbonized in an electric furnace. You can see that.

Further, in the Raman spectrum result of Maki foliage carbide, I _D / I _G of MK-1 is 1.66, I _D / I _G of MK-2 was 1.40. On the other hand, in the MK furnace 280-30 and the MK furnace 280-60, the D band and the G band were not recognized. It can be seen that the carbide production method of the present invention can obtain the carbide of the leaves of the maki tree in a short time.

[Adsorption test]
The following rush carbides of Samples 3 to 8 and rush of Sample 9 were subjected to an adsorption test of cesium or hydrogen sulfide. The results are shown in Tables 2 and 3.
Sample 3: The whole stem (aboveground part) of rush was cut into 3 to 10 mm and used as a carbide, and a rush carbide was produced in the same manner as in Example 1.
Sample 4: The outer cylinder of the rush stalk was peeled off, the cotton part inside the stalk was taken out, and the rush was cut into 3 to 10 mm to be carbide, and a rush carbide was produced in the same manner as in Example 1.
Sample 5: The outer cylinder of the rush stalk was peeled off, the cotton part inside the stalk was taken out, and the rush was cut to about 3 mm as a carbide to produce a rush carbide in the same manner as in Example 1.
Sample 6: The whole stem (aboveground part) of rush was cut into 10 to 20 mm and used as a carbide, and a rush carbide was produced in the same manner as in Example 2.
Sample 7: The whole stem (underground part) of rush was cut into 10 to 20 mm and used as a carbide, and a rush carbide was produced in the same manner as in Example 2.
Sample 8: A whole plant of rush (including a bulb) was cut into 10 to 20 mm as a carbide, and a rush carbide was produced in the same manner as in Example 2.
Sample 9: The entire stem (aboveground part) of rush was cut into 3 to 10 mm and used as it was without heating.

[Cesium adsorption test]
Treatment operation of cesium adsorption test: 100 mL of water was added to 1 g of the sample, and the mixture was stirred for 3 hours or more and allowed to blend in with water. The test was started by adding stable cesium to 1 mg / L while stirring with a magnetic stirrer. The mixture was stirred at room temperature, and the test solution was collected after 0.5 hour, 1 hour, and 2 hours. The collected test solution was filtered through a filter having a pore size of 0.45 μm, and the filtrate was used as an analysis sample. The analysis was performed by an inductively coupled plasma mass spectrometer (ICP-MS). As a result, the concentration at the start was set to 100%, and the ratio of cesium remaining in the test solution was displayed.

Looking at Table 2, the sample 9 which had not been heat-treated had a low cesium adsorption ability. On the other hand, it was found that the rush carbide obtained by the method for producing a carbide of the present invention has a high cesium adsorption ability.
Furthermore, it was found that the rush carbide carbonized at about 250 ° C. has a higher cesium adsorption capacity than the rush carbide carbonized at about 450 ° C.

According to the method for producing carbides of the present invention, it is possible to produce carbides even at a low temperature of about 250 ° C., and it is possible to obtain carbides having new properties not found in the past, such as carbides having high cesium adsorption ability. It was.

Looking at Samples 3 to 5, it was found that Samples 4 and 5 in which the outer cylinder of the stalk of Igusa was peeled off and only the cotton part was carbonized had better cesium adsorption ability than Sample 3 in which the whole stem was carbonized. .. In addition, referring to Samples 6 to 8, the cotton part inside the stem of Igusa was carbonized at a low temperature because the cesium adsorption ability was lower in the whole plant including the underground part and the bulb part with less cotton part. It can be seen that the carbide has a high cesium adsorption capacity.

When the inside of the rush stem of the rush carbide (electric furnace, 480 ° C., 180 minutes) obtained in Comparative Example 1 was observed, there was no evidence of cotton. When carbonized using an electric furnace, the entire rush needs to be heated over time. Therefore, when a large amount of heat is applied to the cotton part and the outer cylinder part is carbonized, it is presumed that the cotton part disappears. That is, it can be said that the method for producing carbides of the present invention makes it possible to obtain carbides having a weak structure such as cotton fibers.

[Hydrogen sulfide adsorption test]
Treatment operation of hydrogen sulfide adsorption test: Place 1 g of the sample in a 5 L container filled with hydrogen sulfide gas having a concentration of 100 ppm, and collect the gas in the container after 0.5 hours, 2 hours, and 6 hours. The concentration of hydrogen sulfide was measured.

Looking at Table 3, it was confirmed that the sample 6 obtained by the method for producing a carbide of the present invention has an excellent ability to adsorb hydrogen sulfide.

[Thermogravimetric analysis of rush]
In order to verify the effect of the above adsorption test, the thermogravimetric analysis of rush (stem) was performed and the formation process of rush carbide was investigated. The thermogravimetric analysis was performed under the conditions of a temperature rise temperature of 10 ° C./min and a nitrogen atmosphere. The result is shown in FIG. FIG. 9A is a diagram showing a change in sample weight (TG). FIG. 9B is a diagram showing the rate of decrease in sample weight (DTG).

Looking at FIG. 9B, a first peak is observed around 210 to 300 ° C. and a second peak is observed around 300 to 380 ° C. It is presumed that this is caused by the difference in carbonization temperature between the outer cylinder and the cotton. Further, the weight balance is 93% at 210 ° C., assuming that the sample weight at the start is 100%, and when the first peak is exceeded, the weight remains drops to 68% (300 ° C.), and further, the second After the peak of 2, it decreased to 36% (380 ° C.).

According to the method for producing a carbide of the present invention, it is possible to provide a method for producing a carbide in which the production time is shortened while the carbonization treatment time is shortened and the energy consumption for heat supply is reduced.

Further, since the carbide obtained by the method for producing a carbide of the present invention has a peculiar adsorption performance in the adsorption of cesium, hydrogen sulfide and the like, it can be used for the development of an adsorbent having new properties.

10, 11, 12 ... Carbide processing device, 1 ... Carbide object, 2 ... Heating unit, 3 ... Heat supply unit, 4 ... Temperature sensor, 5 ... Lid, 6 ... Opening

Claims (2)

A heating step of heating the rush by bringing the rush into contact with a heating unit heated to a temperature of 200 to 500 ° C.
A rolling step, in which the rush is rolled on the heating portion, is provided.
The heating step is a state in which the rush and air are in contact with each other.
A method for producing a carbide of rush, which comprises 30 minutes or less in the heating step. A carbide of rush, which is obtained by the production method according to claim 1.

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