Method for producing carbide

Abstract

Provided is a method for producing a carbonized product of Zoysia japonica or Scirpus karuizawensis, which has a larger specific surface area compared to the carbonized product of Zoysia japonica according to the prior art. 【Solution means】In the production method of the present invention, a plurality of Zoysia japonica are bundled with a bundling tool, cut so as to shorten the length in the longitudinal direction, and then steamed in a state where the lower cross section is generally horizontal. While the Zoysia japonica is being steamed, the tightening force of the bundling tool bundling the Zoysia japonica is weakened, and the top and bottom of the Zoysia japonica are reversed. The steamed Zoysia japonica is dried in a state where the bundling is released and then carbonized. The carbonized Zoysia japonica is activated as necessary.

Description

Technical Field

[0001] The present invention relates to a method for producing carbide.

Background Art

[0002] As a patent document related to a method for producing carbide using Ischaemum rugosum Salisb. as a material, which was invented by the inventor of the present application, there is Patent Document 1.

[0003] Patent Document 1 describes that a carbide with a large specific surface area is produced by going through a step of swelling Ischaemum rugosum Salisb., a step of drying the swollen Ischaemum rugosum Salisb., a step of carbonizing the dried Ischaemum rugosum Salisb., and a step of activating the carbonized Ischaemum rugosum Salisb.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention provides a method for producing a carbide derived from Ischaemum rugosum Salisb. or Schoenoplectus mucronatus (L.) Reichb. having a large specific surface area as compared with a carbide derived from Ischaemum rugosum Salisb. according to the prior art.

Means for Solving the Problems

[0006] The present invention proposes a method for producing carbide, comprising a step of steaming cut Ischaemum rugosum Salisb. or Schoenoplectus mucronatus (L.) Reichb. in a state where the lower cross-section of the Ischaemum rugosum Salisb. or Schoenoplectus mucronatus (L.) Reichb. is horizontal and the longitudinal direction of the Ischaemum rugosum Salisb. or Schoenoplectus mucronatus (L.) Reichb. forms a positive angle with respect to the horizontal plane, and a step of carbonizing the Ischaemum rugosum Salisb. or Schoenoplectus mucronatus (L.) Reichb. steamed in the steaming step.

Effects of the Invention

[0007] According to the present invention, a carbide derived from Ischaemum rugosum Salisb. or Schoenoplectus mucronatus (L.) Reichb. having a large specific surface area can be obtained as compared with a carbide derived from Ischaemum rugosum Salisb. according to the prior art.

Brief Description of the Drawings

[0008]

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Embodiments for Carrying Out the Invention

[0009] [Embodiment] FIG. 1 is a process flow diagram of a method M for manufacturing carbide according to an embodiment of the present invention. The manufacturing method M is a method for manufacturing carbide of rush or Shichijima rush. In the following description, it is assumed that the material used in the manufacturing method M is rush, but instead of or in addition to rush, Shichijima rush may be used.

[0010] First, in the bundling step S01, a plurality of kusa (hereinafter referred to as kusa 9) with a length in the longitudinal direction of about several tens of centimeters are bundled with a bundling tool. The bundling tool preferably has elasticity. As the bundling tool, for example, a ring rubber, a surface fastener bundling band, etc. are used, but various types of bundling tools can be used as long as they can bundle a plurality of bundled kusa 9.

[0011] Subsequently, in the cutting step S02, the kusa 9 bundled with the bundling tool in the bundling step S01 is cut to a substantially predetermined length. The cutting in the cutting step S02 is a cutting that shortens the length of the kusa 9 in the longitudinal direction. That is, the cutting in the cutting step S02 is, for example, a cutting in a direction substantially perpendicular to the longitudinal direction of the kusa 9, but as long as the length of the kusa 9 in the longitudinal direction is shortened by the cutting, the direction of the cutting is not limited to a direction substantially perpendicular to the longitudinal direction of the kusa 9. However, in the following description, it is assumed that the cutting step S02 is a step of cutting the kusa 9 in a direction substantially perpendicular to the longitudinal direction.

[0012] Note that the order of the bundling step S01 and the cutting step S02 may be either first.

[0013] FIG. 2 is a view showing a plurality of kusa 9 bundled with a ring rubber 1 (an example of a bundling tool) in the bundling step S01 and cut in the cutting step S02.

[0014] Subsequently, in the first steaming step S03, the plurality of kusa 9 cut in the cutting step S02 are steamed in a state where the lower cross section is substantially horizontal and the longitudinal direction of the kusa 9 forms a positive angle with respect to the horizontal plane. In this example, as shown in FIG. 2, since the cross section of the kusa 9 is a plane substantially perpendicular to the longitudinal direction of the kusa 9, the kusa 9 is steamed in a state where the longitudinal direction is substantially vertical. Note that the kusa 9 is placed on a steaming plate (for example, a plate-like body made of punching metal) with a large number of holes opened above the upper surface of the water that is contained below the lid-closed pot and heated to become water vapor.

[0015] Subsequently, in the loosening step S04, the tightening force of the fastener that binds the plurality of bundles of Kusa-kusa 9 steamed in the first steaming step S03 is loosened. For example, when the rubber ring 1 is used as the fastener, in the loosening step S04, for example, a part of the plurality of rubber rings 1 is removed, or the rubber ring 1 that has been used so far is replaced with a rubber ring 1 having a larger diameter, thereby reducing the tightening force applied to the Kusa-kusa 9. Further, for example, when a hook-and-loop fastener binding band is used as the fastener, in the loosening step S04, the binding position of the hook-and-loop fastener of the hook-and-loop fastener binding band is changed to reduce the tightening force applied to the Kusa-kusa 9.

[0016] FIG. 3 is a diagram showing a state in which the loosening step S04 is performed on the Kusa-kusa 9 shown in FIG. 2 after passing through the first steaming step S03. FIG. 3(A) shows the Kusa-kusa 9 and the rubber ring 1 shown in FIG. 2 after passing through the steaming step S03. As shown in FIG. 3(A), the Kusa-kusa 9 after passing through the first steaming step S03 generally absorbs more moisture in the lower part than in the upper part and swells more. Therefore, in this case, it is desirable to significantly reduce the tightening force applied to the lower part of the Kusa-kusa 9 compared to the tightening force applied to the upper part by removing the lower rubber ring 1 out of the two rubber rings 1 and replacing the upper rubber ring 1 with a rubber ring 1 having a larger diameter. FIG. 3(B) shows the Kusa-kusa 9 in a state where the lower rubber ring 1 out of the two rubber rings 1 has been removed in the loosening step S04.

[0017] Subsequently, in the inversion step S05, the Kusa-kusa 9 is turned upside down. FIG. 4 is a diagram showing the Kusa-kusa 9 shown in FIG. 3(B) after passing through the inversion step S05. Note that the order of the loosening step S04 and the inversion step S05 may be either first.

[0018] Subsequently, in the second steaming step S06, the Kusa-kusa 9 (FIG. 4) in the state after passing through the loosening step S04 and the inversion step S05 is further steamed.

[0019] Subsequently, in the untying step S07, all the fasteners that bind the Kusa-kusa 9 that has passed through the second steaming step S06 are removed.

[0020] Subsequently, in the natural drying step S08, the loosened mugwort 9 in the loosening step S07 is naturally dried. By natural drying, the mugwort 9 is dried to a degree that contains moisture according to the humidity of the surrounding air.

[0021] Subsequently, in the heat drying step S09, the mugwort 9 dried to a degree that contains moisture according to the surrounding humidity in the natural drying step S08 is heat dried to further reduce the moisture contained in the mugwort 9.

[0022] Subsequently, in the carbonization oxidation step S10 (an example of the first carbonization oxidation step), the dried mugwort 9 in the heat drying step S09 is carbonized and oxidized. The carbonization in the carbonization oxidation step S10 is performed by heating the mugwort 9 in an oxygen atmosphere, that is, in a state where oxygen is sufficiently supplied. For example, in the carbonization oxidation step S10, the mugwort 9 is housed in a heating pot with an open top surface, and is heated with the opening being open. In the carbonization oxidation step S10, smoke comes out from the mugwort 9. In the carbonization oxidation step S10, the temperature for heating the mugwort 9 is a high temperature (for example, 300 °C to 400 °C) at which the mugwort 9 does not burn.

[0023] When almost no smoke comes out from the mugwort 9 in the carbonization oxidation step S10, subsequently, a semi-carbonization oxidation step S11 (an example of the second carbonization oxidation step) is performed on the mugwort 9. The semi-carbonization oxidation step S11 is a step of heating and carbonizing the mugwort 9 in a state where the supply of oxygen is less compared to the carbonization oxidation step S10. For example, in the semi-carbonization oxidation step S11, the mugwort 9 is heated in a state of being housed in a pot whose top surface opening is closed by a lid with one or a small number of small holes opened.

[0024] In the semi-carbonization step S11, air flows in and out between the internal space and the external space of the kettle through the holes opened in the lid. However, compared with the carbonization step S10, the opening area is narrow and the air flow is restricted, so the internal space of the kettle becomes a low-oxygen state. In the semi-carbonization step S11 carried out in such a low-oxygen state, compared with the carbonization step S10 carried out in an environment where oxygen is sufficiently supplied, the tobacco 9 does not burn even if the heating temperature is higher. Therefore, in the semi-carbonization step S11, the temperature for heating the tobacco 9 can be set higher (for example, 450°C to 600°C) than in the carbonization step S10.

[0025] Subsequently, in the pyrolytic carbonization step S12, the tobacco 9 carbonized in a low-oxygen environment in the semi-carbonization step S11 is pyrolytically carbonized. The carbonization in the pyrolytic carbonization step S12 is carried out by heating the tobacco 9 in a substantially oxygen-free environment. The substantially oxygen-free environment can be realized, for example, by reducing the pressure in a sealed space or filling a sealed space with an inert gas such as nitrogen, carbon dioxide, or argon gas, but is not limited thereto.

[0026] Subsequently, in the activation step S13, the tobacco 9 carbonized in the pyrolytic carbonization step S12 is activated. As the activation method in the activation step S13, various known methods can be adopted. That is, in the activation step S13, physical activation such as steam activation or carbon dioxide activation may be performed, or chemical activation using chemical agents such as phosphoric acid treatment, zinc chloride treatment, or potassium hydroxide treatment may be performed, or combined activation combining them may be performed.

[0027] When chemical activation or combined activation is performed in the activation step S13, in the cleaning step S14, cleaning is performed to remove chemical substances (such as phosphoric acid, zinc chloride, and potassium hydroxide) remaining in the tobacco 9. When physical activation is performed in the activation step S13, the cleaning step S14 is unnecessary.

[0028] The above is the description of the manufacturing method M for manufacturing the carbide of tobacco.

[0029] According to the manufacturing method M, it has been confirmed by the evaluation of a third-party evaluation institution that a carbide with a larger specific surface area can be obtained than in the case of the manufacturing method of the carbide of Artemisia capillaris Thunb. according to the prior art. The specific surface area of the carbide can be measured by known methods such as the permeation method and the gas adsorption method. Further, in the case of the gas adsorption method, the specific surface area of the carbide can be measured by the physical adsorption method or the chemical adsorption method.

[0030] The uses of the carbide produced by the manufacturing method M are diverse and can be used for the treatment of wastewater or waste gas, etc., the decolorization and purification of sugar, etc. In addition, it can be used as a water purification material, an electrode material, an electric double layer capacitor, a low-charging material, a reinforcing material, a solvent recovery material, a cesium adsorbent, an iodine adsorbent, a hydrogen sulfide adsorbent, etc.

[0031] The manufacturing method M has a step of steaming Artemisia capillaris Thunb. in a state where the lower cross-section is generally horizontal and the longitudinal direction forms a positive angle with respect to the horizontal plane (the first steaming step S03 and the second steaming step S06). In this steaming step, since the cross-section of Artemisia capillaris Thunb. is generally horizontal and the longitudinal direction is upward (directly upward or obliquely upward), the rising water vapor efficiently penetrates from the cross-section of Artemisia capillaris Thunb. into the interior of Artemisia capillaris Thunb. and moves quickly inside Artemisia capillaris Thunb. As a result, compared with the case of steaming Artemisia capillaris Thunb. in a horizontal position (that is, in a state where the longitudinal direction is horizontal), Artemisia capillaris Thunb. expands in a short time.

[0032] As described above, in the steaming step of the manufacturing method M, since Artemisia capillaris Thunb. takes in the water vapor rising from below from the lower cross-section and expands, the lower part expands more than the upper part. Therefore, the manufacturing method M has an inversion step of turning Artemisia capillaris Thunb. upside down during the steaming step (that is, between the first steaming step S03 and the second steaming step S06). By this inversion step, the whole of Artemisia capillaris Thunb. can be evenly expanded.

[0033] Further, the manufacturing method M has a loosening step of reducing the tightening force of a bundling tool that bundles a plurality of cattail plants during the steaming step. By this loosening step, the problem that the portion of the water-containing and swollen cattail plants bundled by the bundling tool cannot expand sufficiently and non-uniformity occurs in the expansion of the cattail plants is solved or reduced.

[0034] Also, the manufacturing method M has a natural drying step S08 and a heat drying step S09 as drying steps. In this way, the cattail plants dried to an extent corresponding to the ambient humidity in the natural drying step S08 are further dried in the heat drying step S09, so that the subsequent carbonization step (especially the oxidative carbonization step S10 which is the first carbonization step) can be completed in a shorter time compared to the case where the heat drying step S09 is not performed. Also, in many cases, the specific surface area of the carbide (activated carbon) after passing through the activation step S13 becomes larger compared to the case where the heat drying step S09 is not performed.

[0035] Also, the manufacturing method M has, as a carbonization step, a step of oxidatively carbonizing the steamed cattail plants (oxidative carbonization step S10 and semi-oxidative carbonization step S11) and a step of thermally decomposing and carbonizing the oxidatively carbonized cattail plants (thermal decomposition carbonization step S12). As a result, for example, a carbide of cattail plants having a larger specific surface area can be obtained compared to the case where only thermal decomposition carbonization is performed. Further, the manufacturing method M has, as an oxidative carbonization step, an oxidative carbonization step S10 of carbonizing in an environment where oxygen is sufficiently supplied and a semi-oxidative carbonization step S11 of carbonizing in a low-oxygen environment. As a result, for example, a carbide of cattail plants having a larger specific surface area can be obtained compared to the case where only the oxidative carbonization step S10 is performed as the oxidative carbonization step and the semi-oxidative carbonization step S11 is not performed.

[0036] [Modification Example] The above-described manufacturing method M is an embodiment of the method for manufacturing a carbide of cattail plants according to the present invention, and may be variously modified within the scope of the technical idea of the present invention. Examples of those modifications are shown below. Two or more of the modification examples shown below may be appropriately combined.

[0037] (1) In the above-described embodiment, the loosening step S04 was performed only once, but the loosening step S04 may be performed a plurality of times. Also, in the above-described embodiment, the inversion step S05 was performed only once, but the inversion step S05 may be performed a plurality of times. For example, after the first steaming step S03, the loosening step S04, the inversion step S05, and the second steaming step S06 may be repeatedly performed a plurality of times, and then the untying step S07 and subsequent steps may be executed. Also, the number of executions of the loosening step S04 and the inversion step S05 does not necessarily have to be the same.

[0038] (2) In the above-described embodiment, the loosening step S04 was performed between the first steaming step S03 and the second steaming step S06. That is, when the loosening step S04 is executed, the steaming step is interrupted. Instead of this, the steaming step may not be interrupted, and the loosening step S04 may be performed while the steaming step is continuing. For example, a mechanism may be provided that allows an operator to operate a handle from the outside of the pot to loosen the tightening force of the binding tool inside the pot, and by that mechanism, the operator may reduce the tightening force of the binding tool during the steaming step.

[0039] Also, instead of manual operation, for example, a binding tool that automatically expands gradually over time may be prepared, and a plurality of bundles of perilla tied with that binding tool may be steamed. Also, a device that expands the binding tool according to the operation of an operator outside the pot may be prepared, and the binding tool that binds the perilla being steamed inside the pot may be expanded by that device to reduce its tightening force.

[0040] (3) In the above-described embodiment, the inversion step S05 was performed between the first steaming step S03 and the second steaming step S06. That is, when the inversion step S05 is executed, the steaming step is interrupted. Instead of this, the steaming step may not be interrupted, and the inversion step S05 may be performed while the steaming step is continuing. For example, a mechanism may be provided that allows an operator to operate a handle from the outside of the pot to invert the up and down of the perilla inside the pot, and by that mechanism, the operator may invert the up and down of the perilla during the steaming step.

[0041] Further, without manual operation, for example, as time passes or in response to the operation of an operator outside the pot, a device for inverting the mugwort up and down may be prepared, and the device may be used to invert the mugwort being steamed in the pot up and down.

[0042] (4) In the above-described embodiment, the drying process is assumed to include a natural drying process S08 and a heat drying process S09, but only one of these may be performed. For example, as the drying process, only the natural drying process S08 may be performed, and the heat drying process S09 may not be performed.

[0043] (5) In the above-described embodiment, the carbonization process is assumed to include an oxidative carbonization process S10, a semi-oxidative carbonization process S11, and a pyrolytic carbonization process S12, but only some of these may be performed. For example, as the carbonization process, the oxidative carbonization process S10 and the semi-oxidative carbonization process S11 may be performed, and the pyrolytic carbonization process S12 may not be performed.

[0044] (6) In the above-described embodiment, the manufacturing method M is assumed to include an activation process S13 and a washing process S14 (when chemical activation or composite activation is performed in the activation process S13), but depending on the use of the carbide of the mugwort to be manufactured, the activation process S13 and the washing process S14 may not be performed.

[0045] (7) The inversion process S05 is performed to eliminate or reduce the non-uniformity of expansion because the lower part of the vertically placed mugwort expands faster than the upper part in the steaming process. However, when steamed for a sufficiently long time, the moisture absorbed by the mugwort from the lower part in order becomes saturated, and finally the moisture becomes saturated up to the upper part, and the degree of expansion becomes uniform. Therefore, when the steaming process is performed for a sufficiently long time, the inversion process S05 does not necessarily have to be performed. That is, the inversion process S05 is not essential, but the inversion process S05 has an effect of shortening the time required for the steaming process, for example, when the length of the mugwort is long.

[0046] (8) The loosening step S04 is performed to eliminate or reduce the inconvenience that the portion bound by the binding tool of the tobacco cannot expand more than the surroundings due to the tightening force received from the binding tool. However, if the ratio of the portion that cannot expand sufficiently by the binding tool to the whole is small enough to be acceptable, the loosening step S04 may not necessarily be performed. That is, the loosening step S04 is not essential, but the loosening step S04 brings about the effect that the tobacco expands more uniformly and, as a result, a carbide of tobacco with a larger specific surface area is obtained.

[0047] (9) In the above-described embodiment, the cutting step S02 is a step of cutting the tobacco in a direction substantially perpendicular to the longitudinal direction, and the first steaming step S03 and the second steaming step S06 are steps of steaming the tobacco in a state where the longitudinal direction substantially coincides with the vertical direction. However, the cutting step S02 may be a step of cutting the tobacco in a plane that forms a positive angle with the plane perpendicular to the longitudinal direction, that is, a step of cutting obliquely, and the first steaming step S03 and the second steaming step S06 may be steps of steaming the tobacco in a state where the longitudinal direction of the tobacco is inclined so as to approach the horizontal direction from the vertical direction.

[0048] FIG. 5 is a view of the tobacco 9 in a steamed state in the first steaming step S03 of the manufacturing method according to this modification example, as viewed in the horizontal direction. In the cutting step S02 of the manufacturing method according to this modification example, the tobacco 9 is cut in a plane that forms an angle of approximately 30 degrees with the plane perpendicular to the longitudinal direction. And in the first steaming step S03 of the manufacturing method according to this modification example, the tobacco 9 is steamed in a state where the longitudinal direction is inclined by approximately 30 degrees from the vertical direction (that is, in a state that forms an angle of approximately 60 degrees with the horizontal plane) so that the lower cross section is substantially horizontal.

[0049] In the case of the manufacturing method according to this modification example, compared with the case where the tobacco is cut substantially perpendicular to the longitudinal direction and steamed in a state where the longitudinal direction is substantially vertical, since the area of the cut surface where water vapor penetrates into the tobacco is wide, the time required for the first steaming step S03 and the second steaming step S06 is reduced.

[0050] In the steaming step (the first steaming step S03 and the second steaming step S06) of the manufacturing method M according to the above-described embodiment, although the plurality of bundles of mugwort 9 tied by the binding tool are steamed in a state of being placed on the steaming plate in the pot, the bound mugwort 9 may be steamed in a state of being hooked on the hook.

[0051] FIGS. 6 and 7 are diagrams showing how the mugwort 9 is steamed in the steaming step (the first steaming step S03 and the second steaming step S06) of the manufacturing method M according to this modification. In this modification, the plurality of bundles of mugwort 9 tied by the rubber ring 1 are hooked on the hook 21 provided so as to protrude inward on the inner surface of the pot 2 whose upper opening is closed by the lid 3, and are accommodated and heated below the pot 2 and steamed by the water W that becomes water vapor.

[0052] According to this modification, a part of the gravity of the mugwort 9 is applied to the hook 21, and the restriction by gravity when the steamed mugwort 9 expands is reduced. Therefore, for example, compared with the case where the mugwort 9 is steamed in a state of being stacked on the steaming plate in the pot with the longitudinal direction being horizontal, the mugwort 9 expands greatly. As a result, a carbide of mugwort with a larger specific surface area can be obtained.

[0053] (11) In the steaming step (the first steaming step S03 and the second steaming step S06) of the manufacturing method M according to the above-described embodiment, although the plurality of bundles of mugwort are steamed in a bound state, the mugwort does not necessarily have to be bound when it is steamed. In that case, the manufacturing method M does not include the binding step S01, the loosening step S04, and the unbinding step S07.

[0054] FIG. 8 is a diagram showing a state in which a plurality of unbound mugwort 9 are inserted into a cage 4 having a cylindrical shape. The cage 4 containing the mugwort 9 in this way may be placed on the steaming plate in the pot and steamed. If the mesh of the bottom surface of the cage 4 is larger than the diameter of one mugwort 9, the mugwort 9 may fall off the cage 4 through those meshes. In order to prevent such falling of the mugwort 9, a sheet-like body with a finer mesh and higher air permeability than the diameter of the mugwort 9, such as gauze, may be arranged above (or below) the mesh of the bottom surface of the cage 4.

[0055] Further, FIG. 9 is a view showing a state in which a plurality of unbundled rush plants 9 are placed obliquely upright on a plurality of wire shelves 6 disposed obliquely on the steaming plate 5. Note that gauze or the like is laid on the upper surface of the steaming plate 5 (the portion where the lower ends of the rush plants 9 contact), so that the rush plants 9 do not fall off. The rush plants 9 arranged on the steaming plate 5 as shown in FIG. 9 may be steamed in the pot.

[0056] (12) The manufacturing method M according to the above-described embodiment has a bundling step S01 of bundling rush plants having a length of about several tens of centimeters in the longitudinal direction and a cutting step S02 of cutting those rush plants to a predetermined length. However, rush plants having a length of about ten-odd centimeters or several centimeters in the longitudinal direction may be used.

[0057] For example, the ends (end materials) of the rush plants cut in the manufacture of tatami mats are usually discarded. Some of the rush plants that become such end materials are so short that they are not easily bundled. Therefore, instead of bundling such short end material rush plants, they may be placed as they are or after being cut shorter and then steamed on a steaming plate. When the rush plants are cut, they may be cut with a cutting surface that forms a positive angle with respect to the vertical plane in the longitudinal direction. In that case, compared with the case of cutting with the vertical plane in the longitudinal direction, the area of the cutting surface of the rush plants becomes wider, so the time required for the steaming process is shortened.

[0058] FIG. 10 is a view showing how rush plants 9 having a length of about several centimeters in the longitudinal direction are steamed in the steaming step of the manufacturing method M according to this modification. Inside the pot 2 shown in FIG. 10, a plurality of steaming plates 5 are accommodated at predetermined intervals in the vertical direction, and the rush plants 9 spread and placed on those steaming plates 5 are steamed.

[0059] In this way, by steaming in a state where it is spread out on a plurality of steaming plates 5, that is, in a state where the mugwort 9 is not stacked or, even if stacked, the number of mugwort 9 stacked (the number of mugwort 9 adjacent to each other in the vertical direction) is as small as several, the inconvenience that the mugwort 9 is restricted by the gravity of the mugwort 9 on which it is placed and is difficult to expand is avoided or reduced. As a result, compared with the case of steaming in a state where a large number of mugwort 9 are stacked, as a result, a carbide of mugwort with a larger specific surface area is obtained.

[0060] The manufacturing method M according to this modification does not include the bundling step S01, the loosening step S04, the inversion step S05, and the untying step S07. Further, in the manufacturing method M according to this modification, since there is no loosening step S04 and inversion step S05, there is no distinction between the first steaming step S03 and the second steaming step S06.

Explanation of Signs

[0061] 1... O-ring, 2... Pot, 3... Lid, 5... Steaming plate, 6... Wire rack, 9... Mugwort, 21... Hook.

Claims

1. steaming the cut rush or Shichitoui in a state where the lower cross section of the rush or Shichitoui is horizontal and the longitudinal direction of the rush or Shichitoui forms a positive angle with the horizontal plane; a step of carbonizing the steamed rush or Shichitou rush in the steaming step; A method for producing a carbide comprising the steps of:

2. The steaming step includes a step of steaming the rush or Shichitoi with one end facing downward, and a step of steaming the rush or Shichitoi steamed in the step of steaming with one end facing downward with the one end facing upward. The method of claim 1 .

3. The method includes a step of tying a plurality of rushes or Shichito rushes with a tying tool, The steaming step is a step of steaming the multiple rushes or Shichitou rushes bound in the binding step, During the steaming process, a step of loosening the fastening force of a binding tool binding the multiple stalks of rush or Shichito rush being steamed is included. The method of claim 1 .

4. The carbonization step includes a step of oxidizing and carbonizing the steamed rush or Shichitou rush in the steaming step, and a step of pyrolyzing and carbonizing the carbonized rush or Shichitou rush in the oxidizing and carbonizing step. The method of claim 1 .

5. The carbonization step includes a first oxidation carbonization step of heating the kettle containing the rush or Shichitou rush with the opening open to carbonize the rush or Shichitou rush, and a second oxidation carbonization step of heating the kettle containing the rush or Shichitou rush carbonized by the first oxidation carbonization step with the opening closed with a lid having one or more holes to further carbonize the rush or Shichitou rush. The method of claim 1 .

6. A step of binding a plurality of rush or Shichito rush stalks with a binding tool; cutting the bundled stalks of rush or Shichito-i grass along a plane that forms a positive angle with a plane perpendicular to the longitudinal direction; Have The steaming step is a step of steaming the cut rush or Shichitoui in the cutting step in a state in which the cut surface on the lower side of the rush or Shichitoui is horizontal and the longitudinal direction of the rush or Shichitoui forms a positive angle with the horizontal plane. The method of claim 1 .

7. A step of naturally drying the rush or Shichitou rush steamed in the steaming step; a step of heating and drying the rush or Shichitou rush dried in the step of natural drying; having The carbonization step is a step of carbonizing the rush or Shichito-i grass dried in the heat drying step. The method of claim 1 .

8. The method includes a step of tying a plurality of rushes or Shichito rushes with a tying tool, The steaming step is a step of steaming the multiple rushes or Shichitoi bundled in the bundling step while the rushes or Shichitoi are hung on a hook. The method of claim 1 .

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