JP6136040B1 - Manufacturing method of carbide - Google Patents

Abstract

An object of the present invention is to provide a method for producing carbide in which the production time is shortened while reducing the energy consumption for heat supply by shortening the carbonization time. In order to solve the above problems, a heating step of heating the carbonized material by bringing the carbonized material into contact with a heating unit heated to a temperature of 200 to 500 ° C., and the carbonized material to the heating unit There is provided a method for producing a carbide comprising a rolling step of rolling on a metal. Thereby, the carbonization process time is shortened, and the manufacturing method of the carbide | carbonized_material which shortened manufacturing time can be provided, reducing the energy consumption for heat supply. Moreover, according to the method for producing carbide of the present invention, it is possible to obtain a carbide having a weak structure such as a leaf of wood, a herb, or a cotton-like fiber inside the rush. [Selection] Figure 1

Description

  The present invention relates to a method for producing a carbide by carbonizing wood, leaves, grass and the like. More specifically, the present invention relates to a method for producing a carbide having a shortened carbonization time and excellent energy saving properties.

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

  As a method for obtaining a carbide by heating grass or wood, etc., as disclosed in Patent Document 1, it is generally carried out using a furnace such as an electric furnace at 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 carbide, a method of heating on a metal heating plate heated from below is known. For example, Patent Document 2 discloses a method in which a corn-cob granule is placed on a heating plate having a mountain-shaped cross section and carbonized over about 15 hours. Further, the carbonization temperature is set to 600 to 700 ° C., and steaming is performed by appropriately turning over to avoid complete combustion.

JP 2001-64653 A JP 2008-81332 A

According to the conventional method for producing carbide, heating for a long time consumes a large amount of fuel and power for supplying heat. In addition, the manufacturing time becomes long and the workability is poor.
Accordingly, an object of the present invention is to provide a method for producing carbides in which the production time is shortened while reducing the energy consumption for heat supply by shortening the carbonization time.

As a result of earnestly examining the above-mentioned problems, the present inventor, as a result of rolling carbide on a heating section heated to a temperature of 200 to 500 ° C., a method for producing carbide that is heated in a conventional furnace, The present inventors have found that carbide can be obtained in a short time compared to the present invention.
Specifically, it is the following carbide manufacturing method.

  The manufacturing method of the carbide | carbonized_material for solving the said subject is the heating process which heats the said to-be-carburized object by making the to-be-carburized object contact the heating part heated at the temperature of 200-500 degreeC, and the said to-be-carburized object is said heating A rolling step of rolling on the part.

  According to this method for producing carbide, since the article to be carbide 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 article to be carbide and heated in a conventional furnace. Compared with the carbonization method, carbide can be obtained in a short time. Therefore, energy consumption for heat supply is reduced. Furthermore, the temperature of the heating part is as low as 200 to 500 ° C., and further energy saving can be realized. Further, the manufacturing time can be shortened, and a method for manufacturing a carbide excellent in workability can be provided.

Furthermore, as one embodiment of the present invention, in the method for producing carbide, the heating step is characterized in that the temperature of the heating part is 200 to 350 ° C. and the object to be carbide and air are in contact with each other.
According to this feature, since carbonization can be performed at a low temperature, an excellent effect is exhibited from the viewpoint of energy saving. Moreover, since carbonization advances rapidly by heating in the state which the to-be-carburized object and air contacted, it can carbonize in a further short time.

Furthermore, as one embodiment of the present invention, the above-described method for producing carbide has a feature that the time of the heating step is within 60 minutes.
According to this feature, carbonization can be performed by a heating process within 60 minutes, so that the effect of the present invention can be further exhibited that the carbonization time can be shortened and the energy consumption for heat supply can be reduced.

Furthermore, as one embodiment of the present invention, in the above-described method for producing a carbide, the object to be carbonized is a herb or a tree leaf.
According to this feature, the effect of the present invention can be further exhibited.

Furthermore, as one embodiment of the present invention, in the above-described carbide production method, the material to be carbonized is rush.
The rush has an elongated cylindrical outer cylinder portion and cotton-like fibers inside thereof, and the carbide of the cotton-like fibers inside has an excellent effect in cesium adsorption capacity and the like. And when the carbonization process of a rush is performed at high temperature, the fall of those effects is recognized. This is presumably due to the disappearance of the internal cotton-like fibers due to the treatment at a high temperature. However, according to the method for producing a carbide of the present invention, the carbonization treatment can be performed at a low temperature, so that a carbide having an excellent effect in cesium adsorption ability and the like can be obtained.

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

  Moreover, according to the method for producing carbide of the present invention, it is possible to obtain a carbide having a weak structure such as a leaf of wood, a herb, or a cotton-like fiber inside the rush. Thereby, it is possible to obtain a rush of rush, which is a rush of carbide having a cotton part inside.

It is a schematic explanatory drawing of the carbonization processing apparatus used for the manufacturing method of the carbide of the 1st embodiment of the present invention. It is a schematic explanatory drawing of the carbonization processing apparatus used for the manufacturing method of the carbide of the 2nd embodiment of the present invention. It is a schematic explanatory drawing of the carbonization processing apparatus used for the manufacturing method of the carbide of the 3rd embodiment of the present invention. It is a figure showing the Raman spectrum of the rush carbide (Example 1) of Example 1 carbonized at the temperature of the heating part at about 250 degreeC. It is a figure showing the Raman spectrum of the rush carbide (Example 2) of Example 2 carbonized at the temperature of the heating part at about 450 degreeC. It is a figure showing the Raman spectrum of the rush carbide of the comparative example 1 carbonized by the carbonization temperature of 480 degreeC and the carbonization process time for 180 minutes using the electric furnace. It is a figure showing the Raman spectrum of the rush carbide of the comparative example 2 carbonized at the carbonization temperature of 300 degreeC using the electric furnace. FIGS. 7A to 7D show Raman spectra of rush carbides treated with carbonization treatment time of 10 minutes, 20 minutes, 30 minutes, and 40 minutes, respectively. It is a figure showing the Raman spectrum of the rush carbide of the comparative example 3 carbonized using the electric furnace at the carbonization temperature of 350 degreeC. FIGS. 8A to 8D show Raman spectra of rush carbides treated with carbonization treatment time of 10 minutes, 20 minutes, 30 minutes, and 40 minutes, respectively. It is a figure showing the result of the thermogravimetric measurement of a rush. FIG. 9A is a diagram showing a change in the sample weight (TG). FIG. 9B is a diagram showing a decrease rate (DTG) of the sample weight.

  The manufacturing method of the carbide of the present invention includes a heating step of heating the carbide by bringing the carbide into contact with a heating unit heated to a temperature of 200 to 500 ° C., and rolling to roll the carbide on the heating unit. Process.

(Carbide)
The carbide to be carbide of the present invention is not particularly limited as long as it forms a carbide by heating. For example, there are herbs such as rush and rice straw, wood such as cedar chips, leaves of wood, coconut shell, paper, plastic, and dried sludge. The shape is not particularly limited, but is preferably rod-like or granular from the viewpoint of efficiently transferring heat from the heating unit. In the case of a rod-like 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 a granular shape, 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, still more preferably 30% by mass or less, and particularly preferably 15% by mass or less. . The moisture content of the object to be carbonized can be adjusted by a known drying process such as sun drying or heat drying.

A carbonized material suitable for the method for producing a carbide of the present invention is a leaf or herb of a tree, and rush is particularly suitable as a herb.
The rush is a plant belonging to the rush family, and is mainly used for tatami mats and goza. Although it does not restrict | limit especially as a raw material of a rush, It is preferable to utilize the rush waste generated in the case of manufacture of a tatami mat, a goza, etc. from a viewpoint of effective utilization of a waste.

  The stem portion of the rush has an elongated cylindrical outer cylinder portion and a cotton-like fiber (hereinafter referred to as “cotton portion”) inside thereof. The carbide obtained by carbonizing the cotton part exhibits unique adsorption performance such as cesium adsorption ability. When this cotton part is carbonized at a high temperature, the internal cotton-like fibers disappear, and the adsorption performance deteriorates. Therefore, it cannot 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 carbide manufacturing method of the present invention, the carbonization treatment can be performed at a low temperature in a short time, so that the carbide of the cotton part can be obtained.

  When carbonizing the rush, it is preferable to cut the rush raw material, 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 more preferably 1 to 30 mm. Is particularly preferred. Thereby, since heat is efficiently transmitted from the heating unit, the effect of the present invention can be further exhibited.

  Further, when the rush is carbonized, the whole plant may be carbonized or only the stem portion may be carbonized. Furthermore, you may carbonize by separating the outer cylinder part and cotton part of a stem part.

  Moreover, as long as it is a woody leaf, the shape may be as it is or may be cut. In the case of 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, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that this embodiment does not limit the present invention.

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

(Heating process)
A heating process is a process of heating the to-be-carburized object 1 by making the to-be-carburized object 1 contact the heating part 2 heated by the temperature of 200-500 degreeC.
By bringing the article to be carbide 1 into contact with the heating unit 2, the article to be carbide 1 can be efficiently heated, so that the carbide can be produced in a short time.

  In addition, as a method of making a to-be-carburized thing and a heating part contact, a to-be-carburized object may be made to contact after heating a heating part to 200-500 degreeC, and after making to-be-carburized and a heating part contact, a heating part is 200-500. You may heat to degreeC. From the viewpoint of shortening the time of the heating step, it is preferable to contact the carbide to be heated after heating the heating section to 200 to 500 ° C.

  Moreover, the temperature of the heating part 2 is 200-500 degreeC, Preferably it is 200-400 degreeC, Most preferably, it is 200-350 degreeC. By setting the temperature of the heating unit 2 to a low temperature, combustion due to ignition can be suppressed even if the object to be carbide 1 is heated in contact with air. Moreover, the carbide | carbonized_material which has unique adsorption | suction performances, such as cesium adsorption ability, can be obtained.

  The state in which the object to be 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 structure for forming such a state is not particularly limited. For example, as shown in FIG. 1, the structure to heat the object to be carbide 1 by opening the upper part of the heating unit 2, or air to the closed carbonization chamber. The structure etc. which heat while supplying are mentioned. In addition, since it heats in the state which the to-be-carburized object 1 and air contacted, carbonization processing is accelerated | stimulated and there exists an effect of shortening carbonization time.

  Moreover, you may heat in inert gas atmosphere, such as nitrogen, a carbon dioxide, and argon gas. Although it does not restrict | limit especially as a structure which forms such a state, For example, the structure which covers the to-be-carburized object 1 with a lid | cover, the structure which supplies an inert gas, etc. are mentioned. By using an inert gas atmosphere, the risk of ignition when heated to 350 ° C. or higher can be reduced.

  The time for the heating step is not particularly limited, but is preferably within 180 minutes, more preferably within 60 minutes, still more preferably within 45 minutes, and particularly preferably within 30 minutes from the viewpoint of energy saving. In addition, the standard of completion | finish of a heating process can be judged by smoke disappearing.

  The heating member 2 may be 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, a heating member such as a dish, bowl dish, cylinder, rectangular cylinder, a rotating pan that rotates a heating member such as a dish, bowl dish, or a heating member such as a cylinder, rectangular cylinder, etc. A rotating drum type that rotates may be used.

  Moreover, you may adjust the time of a heating process by making the heating part 2 into the shape of a belt conveyor and adjusting the length and transfer speed of a belt conveyor. According to this configuration, the carbide can be continuously produced.

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

  The temperature sensor 4 is 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 due to a sudden temperature rise.

(Rolling process)
The rolling process is a process of rolling the carbide 1 on the heating unit 2. By rolling the object 1 on the heating unit 2, the object 1 can be uniformly carbonized.
As a structure for rolling the to-be-carburized object 1, the structure which shakes the heating part 2 up and down or right and left, the structure which rotates a rotating pan or a rotating drum, etc. are mentioned, for example. In addition, you may roll the to-be-carburized object 1 using stirring tools, such as a spatula.

[Second Embodiment]
FIG. 2 is a schematic explanatory diagram of the carbonization processing apparatus 11 used in the carbide manufacturing method according to the second embodiment of the present invention.
This carbonization processing apparatus 11 is the structure provided with the lid | cover 5 which covers the to-be-carburized object 1 further to the carbonization processing apparatus 10 used for the manufacturing method of the carbide | carbonized_material of a 1st embodiment.

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

[Third Embodiment]
FIG. 3 is a schematic explanatory view of a rotary pan type carbonization processing apparatus 12 used in the carbide manufacturing method of the third embodiment of the present invention.
The carbonization processing apparatus 12 is configured such that the bowl dish-shaped heating unit 2 having the opening 6 is installed at an inclination and rotates around the center of the bottom of the bowl dish-shaped heating unit 2.

  In the carbide manufacturing method of the third embodiment, in the rolling step, the to-be-carburized object 1 placed inside is rolled by rotating the bowl dish-shaped heating unit 2. 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 unit 2. In addition, since the bowl dish-shaped heating part 2 has the opening part 6, it will be in the state which the to-be-carburized 1 and air contacted.

[Production of carbide]
Example 1
The rush carbide was produced by the method for producing carbide according to the first embodiment described above, with the dried rush cut into 3 to 10 mm as the article to be carbonized. The temperature of the heating part was about 250 ° C., and the heating process time was about 5 minutes. This rush carbide is referred to as “Sample 1”. The Raman spectrum of sample 1 was measured, and the result is shown in FIG.

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

(Example 3)
The charcoal of the leaves of the maki tree was manufactured by the method for manufacturing the charcoal of the first embodiment, using the leaves of the maki tree (undried material) as the object to be carbonized. The temperature of the heating part 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.” The Raman spectrum was measured for MK-1.

Example 4
The charcoal of the leaves of the maki tree was manufactured by the method for manufacturing the charcoal of the first embodiment, using the leaves of the maki tree (undried material) as the object to be carbonized. The temperature of the heating part 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”. The Raman spectrum was measured for MK-2.

(Comparative Example 1)
The rush cut into 3 to 10 mm was used as a material to be carbonized, and carbonized for 180 minutes at a carbonization temperature of 480 ° C. in an argon atmosphere using an electric furnace to produce rush carbide. This rush carbide is referred to as “480-180”. The Raman spectrum was measured for 480-180 , and the result is shown in FIG.

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

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

(Comparative Example 4)
Carbide leaves (undried material) were carbonized using an electric furnace in an argon atmosphere at a carbonization temperature of 280 ° C. for 30 minutes to produce charcoal leaves. The carbide of the leaves of this maki tree is referred to as “MK furnace 280-30”. The Raman spectrum was measured for the MK furnace 280-30.

(Comparative Example 5)
Carbide leaves (undried matter) were carbonized using an electric furnace in an argon atmosphere at a carbonization temperature of 280 ° C. for 60 minutes to produce carbides of the leaves of the persimmon tree. The carbide of the leaves of this maki tree is referred to as “MK furnace 280-60”. The Raman spectrum was measured for the MK furnace 280-60.

[Raman spectrum measurement of carbides]
The measurement conditions of the Raman spectrum are as follows.
Measuring instrument: Microscopic laser Raman spectroscopic analyzer (Renishaw "inVia Reflex")
Laser: YAG (doubling), 532 nm
Output: 50 mW reduced to 5% Objective lens: 100 times Integration count: 5 Measurement range: 800-2000 cm ^-1
Exposure time: 100s

For each sample of the example and the comparative example, the area ratio of the peak (D band) around 1400 cm ⁻¹ derived from the sp3 hybrid orbit and the peak (G band) around 1600 cm ⁻¹ derived from the sp2 hybrid orbit ( I _D / I _G ) was calculated and summarized in Table 1 below.

When the Raman spectrum of the rush carbide (sample name: 480-180) sufficiently carbonized using an electric furnace was observed, a D band and a G band were observed, and the area ratio was 2.6.
In addition, the D band and the G band were also observed in the Raman spectra of Sample 1 (Example 1) and Sample 2 (Example 2), and the area ratios were 2.4 and 2.5, respectively. That is, according to the method of manufacturing carbides of Examples 1 and 2, the sample “480-180” sufficiently carbonized in the electric furnace even when 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 can be obtained.

  Next, in Comparative Examples 2 and 3, an rush carbonized product that was carbonized using an electric furnace at carbonization temperatures of 300 ° C. and 350 ° C. and a carbonization time of 10 to 40 minutes was examined. As a result, at 300 ° C., sufficient peaks were not formed in the D band and G band even after heating for 40 minutes. In addition, when heated at 350 ° C. for 40 minutes, the area ratio of the D band to the G band became equal to that of Samples 1 and 2, but the half width of the D band was slightly larger than Samples 1 and 2, and the heating time was insufficient. It is recognized 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 Comparative Examples 2 and 3 carbonized in an electric furnace. I understand 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, D band and G band were not recognized in MK furnace 280-30 and MK furnace 280-60. It can be seen that the carbide of the leaves of the maki tree can be obtained in a short time by the method for producing carbide of the present invention.

[Adsorption test]
The cesium or hydrogen sulfide adsorption test was performed on the rush carbides of the following samples 3 to 8 and the rush of sample 9. The results are shown in Tables 2 and 3.
Sample 3: A rush charcoal was produced in the same manner as in Example 1 except that the whole stem (ground part) of the rush was cut into 3 to 10 mm to be carbonized.
Sample 4: The outer cylinder part of the stem of the rush was peeled off, the cotton part inside the stem was taken out, and what was cut into 3 to 10 mm was made to be carbonized, and the rush carbide was produced in the same manner as in Example 1.
Sample 5: The outer cylinder part of the stem of the rush was peeled off, the cotton part inside the stem was taken out, and what was cut into about 3 mm was used as the article to be carbonized, and the rush carbide was produced in the same manner as in Example 1.
Sample 6: A rush charcoal was produced in the same manner as in Example 2 except that the whole stem (above ground) of the rush was cut into 10 to 20 mm to be carbonized.
Sample 7: A rush charcoal was produced in the same manner as in Example 2 except that the whole stem (underground) of the rush was cut into 10 to 20 mm to be carbonized.
Sample 8: A rush carbide was produced in the same manner as in Example 2 except that the whole grass of rush (including the bulb part) was cut into 10 to 20 mm to be carbonized.
Sample 9: The whole stem (above ground) of rush was cut into 3 to 10 mm and used as it was without heating.

[Cesium adsorption test]
Processing operation of cesium adsorption test: 100 mL of water was added to 1 g of a sample, and the mixture was stirred for 3 hours or more and allowed to adjust to water. While stirring with a magnetic stirrer, stable cesium was added to 1 mg / L and the test was started. 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 with a filter having a pore diameter of 0.45 μm, and the filtrate was used as an analysis sample. The analysis was performed with an inductively coupled plasma mass spectrometer (ICP-MS). As a result, the concentration at the start was defined as 100%, and the ratio of cesium remaining in the test solution was displayed.

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

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

  Looking at Samples 3 to 5, samples 4 and 5 in which the outer cylinder portion of the rush stem was peeled off and carbonized only in the cotton portion were found to have a better cesium adsorption ability than Sample 3 in which the whole stem was carbonized. . Moreover, even if it refers to the samples 6-8, since the whole plant including the underground part and bulb part with few cotton parts reduces the cesium adsorption ability, the cotton part inside the rush stem was carbonized at low temperature. It can be seen that the carbide has a high cesium adsorption capacity.

  In addition, about the rush carbide (electric furnace, 480 degreeC, 180 minutes) obtained in the said comparative example 1, when the inside of the rush stalk was observed, the trace of the cotton part was lose | eliminated. When carbonizing 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 assumed that the cotton part disappears. That is, it can be said that the carbide manufacturing method of the present invention makes it possible to obtain a carbide having a weak structure such as a fiber of a cotton part.

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

  When Table 3 was seen, it was recognized that the sample 6 obtained by the manufacturing method of the carbide | carbonized_material of this invention has the outstanding hydrogen sulfide adsorption ability.

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

  When FIG. 9 (B) is seen, the 1st peak is recognized by 210-300 degreeC vicinity, and the 2nd peak is recognized by 300-380 degreeC vicinity. It is inferred that this is caused by a difference in carbonization temperature between the outer tube portion and the cotton portion. Moreover, the weight residue is 93% at 210 ° C. with the sample weight at the start as 100%, and when the first peak is exceeded, it decreases to 68% (300 ° C.). When the peak of 2 was exceeded, it decreased to 36% (380 ° C.).

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

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

DESCRIPTION OF SYMBOLS 10, 11, 12 ... Carbonization processing apparatus, 1 ... Carbide, 2 ... Heating part, 3 ... Heat supply part, 4 ... Temperature sensor, 5 ... Cover, 6 ... Opening part

Claims (5)

A heating step of heating the carbide by bringing the carbide to be heated into contact with a flat or rotating pan-type heating unit heated to a temperature of 200 to 500 ° C; and
A rolling step of rolling the flat plate-like heating unit up and down or left and right, or rotating the carbide pan on the heating unit by rotating the rotary pan-type heating unit; A method for producing a carbide characterized.   The said heating process is the state which the temperature of the said heating part is 200-400 degreeC, and the said to-be-carburized object and air contacted, The manufacturing method of the carbide | carbonized_material of Claim 1 characterized by the above-mentioned.   The method for producing a carbide according to claim 1 or 2, wherein the time of the heating step is within 60 minutes.   The method for producing a carbide according to any one of claims 1 to 3, wherein the carbide is a herb or a leaf of a tree.   A rush of char, characterized in that it is a rush of char.

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