JP2001048648A - Carbide formed body and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carbide formed body which is produced in a high carbon yield and has high adsorption capacity and is effective in prevention of pollution and cleaning of the environment by utilizing bark and/or stems of herbaceous plants, conventionally disposed as waste, as the main raw materials of the carbide formed body and also to provide a production process for the formed body. SOLUTION: This carbide formed body is produced by a production process which comprises: compressing a chip-like and/or fibrous lignocellulose material in such a way that the resulting compressed material has a specific gravity of 0.2-1.2 to obtain a formed body; and thereafter, subjecting the formed body to heating or heating under pressure to a temperature in the range of 500 to 1,200 deg.C in the absence of oxygen and maintaining the formed body at this temperature to carbonize the formed body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded carbide which is formed into an arbitrary shape and is suitable as a building material, an exterior material, a gardening material or an environmental purification material, and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, woody carbides have attracted attention as environmental purification materials, and various molded products have been developed. Many of these products are conventionally carbonized by cutting wood scraps as they are, or by cutting them into small pieces, or carbonizing wood, bark, and herbaceous plant powder once in pellet form. Have been done. Therefore, when using large-sized charcoal, finely crushed charcoal is packed in a bag to give it a shape, or an adhesive is applied to carbonized chips, powders, pellets, etc. to form it into a large size And so on.

[0003] The method of bagging previously carbonized flakes or powder requires bagging operation, which causes problems such as breakage of the bag during handling, and it is difficult to give a complicated shape. There were problems such as.

[0004] On the other hand, when a chip-shaped or powdery carbide is formed using an adhesive, it is inherently difficult to bond, and the selection of the adhesive to be used is limited. Also,
There is also a problem that the adhesive covers fine voids existing on the surface of the carbide and reduces the ability to adsorb the carbide. Furthermore, a special molding step and equipment are required to bond the carbonized chips and powders, and there is a problem that the production cost of the molded carbide is greatly improved.

[0005]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above problems. An object of the present invention is to provide a method for economically and efficiently obtaining a shaped carbide having a shape that is easy to handle by being used in various applications without impairing the ability to adsorb harmful substances. In particular, in the present invention, the use of bark and herbaceous plant stalks, which are normally discarded, as main raw materials provides characteristics having a high carbon yield and excellent adsorption capacity. A useful shaped carbide and a method for producing the same are provided.

[0006]

Means for Solving the Problems To solve the above problems, the molded carbide of the present invention is prepared by compressing a chip-shaped and / or fibrous lignocellulose material so as to have a specific gravity of 0.2 to 1.2. After being tightened to form a molded body, it is carbonized by heating or heating and pressurizing at 500 to 1200 ° C. while blocking oxygen.

[0007] Further, the molded carbide of the present invention is such that the chip-shaped and / or fibrous lignocellulosic material is mainly composed of bark or / and herbaceous plant stems. Further, when the molded carbide of the present invention is formed using chip-like or fibrous bark or / and herbaceous plant stem as a main raw material, a pressure of 10 to 50 kgf / cm 2 is applied at 100 to 250 ° C. to form a molded body. Things.

In the method for producing a molded carbide according to the present invention, a chip-shaped and / or fibrous lignocellulose material is pressed to a specific gravity of 0.2 to 1.2 to form a molded body, and then oxygen-containing material is formed. It is carbonized by heating or heating and pressurizing at 500 to 1200 ° C under cutoff.

Further, the method for producing a shaped carbide according to the present invention comprises:
The chip-shaped and / or fibrous lignocellulosic material is mainly composed of bark or / and herbaceous plant stems. In addition, the method for producing a shaped carbide according to the present invention comprises the steps of: cutting a material mainly composed of chip-shaped or fibrous bark and / or herbaceous plant stems at 100 to 250 ° C and 10 to 50 kgf / cm.
It was molded by applying pressure of 2.

[0010] Furthermore, the method of the present invention for producing a molded carbonized product is characterized in that when a molded product is formed using a chip-shaped or fibrous lignocellulose material or a material mainly composed of bark or / and herbaceous plant stem, steam is produced. It is molded by heating and pressing while spraying.

[0011]

Next, the molded carbide of the present invention and the method for producing the same will be described in detail below. The material used for the molded article and the method for producing the same is a lignocellulose material which has been made into a chip or a fiber in advance. You may mix and use. In addition, the use of bark and herbaceous plant stem chips or their fibers, which are generally of little value because they are generally discarded or incinerated, make them self-adhesive only by heating and pressing. The bark is more preferable as a raw material of the formed carbide, since a carbon yield higher than that of the woody material is obtained when the bark compact is heated or heated and pressurized at a high temperature while suppressing the supply of oxygen, and carbonized. Be a raw material. In addition, even if wood chips or fibers are mixed into the bark or a part of the herbaceous plant stem, the self-adhesion effect is not impaired and the carbonization yield is limited to the woody material unless the mixing ratio exceeds the ratio of the bark or the herbaceous plant stem. Better than when used.

The lignocellulosic material in the form of chips or fibers can be used as a waste material generated in the wood industry, irrespective of species and type of wood, or as a bark treated as construction waste material, waste paper, forestry waste or agricultural waste. And herbaceous plant stems can also be used effectively. In addition, bark and herbaceous plant stems that become a molded body due to self-adhesive properties are not limited to tree species,
Conifers such as Japanese cedar, cypress, larch, Japanese pine, hemlock and radiatapine, or Rawan, Meranti
The same effect is achieved for wood species such as southern lumber, hardwood such as oak, hippopotamus, and poplar, and wood species such as plywood that are used in large quantities, and also for rice, wheat, corn, bamboo, sugarcane, and reeds. Even if a stem is used, it can be used as a shaped carbide. Of course, if an adhesive is used when obtaining the molded product, the bark, the plant stem and the woody material can be used in the same manner, and there is no problem even if they are mixed and used in an arbitrary ratio.

The type of adhesive used for obtaining the molded article is not particularly limited, and phenolic resin adhesives such as phenolic resin and resorcinol resin, and diphenylmethane diisocyanate. An isocyanate-based adhesive containing a prepolymer (polymeric MDI), an adhesive containing wood liquefied liquid as a main component or furfural,
In addition to thermosetting resin adhesives such as furan-based resin adhesives using furfuryl alcohol and the like, thermoplastic resin adhesives such as polyvinyl acetate resin emulsion adhesives, and any known adhesives such as starch-based adhesives An adhesive can be used.

When molding chips or fibers of lignocellulose to obtain a molded body, the chips or fibers sprayed with an adhesive are matted to a predetermined thickness and pressed with a flat plate press or a die press. Then, a pressure of 5 to 40 kgf / cm2 is applied at room temperature to press and clamp for a necessary time until the adhesive is cured. At that time, if the molded body is heated to a temperature of 50 to 200 ° C., molding can be performed in a short time of about 0.3 to 1.0 minute per 1 mm of the thickness of the molded body. By adjusting the specific gravity of the molded article, the porosity and adsorption performance of the molded carbide can be controlled. Therefore, it is desirable to adjust the specific gravity of the molded article to be in the range of 0.2 to 1.2.

In order to obtain a molded product utilizing self-adhesiveness using chips or fibers of bark or herbaceous plant stem as a raw material, a pressure of 10 to 50 kgf / cm 2 is usually applied at 100 to 250 ° C. Heat-press for 1 to 10 minutes per mm of the thickness of the molded body. In this case, the specific gravity of the molded body is as high as 0.7 or more under ordinary conditions, but the bond can be integrated by carbonization even at a specific gravity as low as 0.2 to 0.5.

However, in order to obtain a molded product having a low specific gravity by utilizing the self-adhesiveness of bark and the stem of a herbaceous plant, a steam injection press for directly injecting steam into the molded product when heating and pressing is used. , The self-adhesion of the bark is promoted, the specific gravity
A compact having a low specific gravity of 0.2 to 0.7 can be easily obtained. The steam used at that time has a steam pressure of 2 to 15 kgf / cm2, and the steam injection time is suitably set to 1/10 to 1/1 of the heat pressure time.

The molded body formed into a plate or an arbitrary shape by these methods is subsequently subjected to carbonization by heating or heating and pressurizing at a high temperature while suppressing the supply of oxygen to form a molded carbide. At this time, a heating method is to seal the molded body in a nonflammable box in a normal heating furnace, or to fill nitrogen or carbon dioxide gas to suppress the supply of oxygen and heat to form a molded carbide.

The formed carbide or the carbonizing apparatus used in the method for producing the same may be any apparatus capable of heating to a high temperature while suppressing the supply of oxygen, and the heating means may be electric heating, high-frequency heating or direct fire by gas. A heating type is used. Further, an autoclave or the like can be used.

The temperature at which the compact is heated or heated and pressurized to carbonize is preferably 100 to 1200 ° C., and particularly when it is used as an environmental purification material, it is desirable to perform the heat treatment at a temperature of 500 to 1200 ° C. Furthermore, the rate of temperature rise until reaching these heating temperatures is important, and it is necessary to suppress the rate of temperature rise to 15 ° C. or less per minute in order to keep the shape change of the formed carbide small. In particular, as the size of the chip used for the compact increases, the rate of temperature rise must be adjusted more slowly. If the heating temperature rise rate is higher than that during carbonization, the compact will crack and bulge during the carbonization process, deforming, and it will be difficult to maintain the shape of the compact.

Further, the deformation at the time of carbonization heat treatment is smaller in the molded product mainly composed of bark than in the molded product made of woody material or plant stem, and the bark molded product has a lower carbon yield after carbonization heat treatment. There is a feature that a value as high as 5 to 10% can be obtained as compared with other molded articles.

The formed carbide can be formed into an arbitrary shape depending on its use. By heating or heating and pressing a formed body previously formed into a desired shape at a high temperature and carbonizing, the shape and dimensions are reduced to the original dimensions. Shrink to 30-90% of
The carbon yield will be 25-50%. Therefore, if a compact having a size that anticipates this carbonization shrinkage is made in advance,
A molded carbide having a size suitable for the intended use can be obtained.

Next, regarding the formed carbide according to the present invention,
The following describes test examples.

Test Examples 1 to 4 Using chip-shaped cedar waste material and cedar bark waste material, crushed using a hammer mill, and then sieved using 0.85 mm and 5.00 mm sieves,
Particles having a particle size of 0.85 to 5.00 mm were used. Each of these chips was sprayed with a self-emulsifying polyurethane-based adhesive (WC-300, manufactured by Nippon Polyurethane Co., Ltd.) in an amount equivalent to 5% of the total dry weight, followed by forming, and maintained at a temperature of 150 ° C. Approximately 5kgf / cm when inserted into a steam injection hot press
It was hot pressed at a pressure of 2 for 5 minutes. Immediately upon reaching the predetermined heat pressure, steam with a steam pressure of 6 kgf / cm2 was injected for 30 seconds. In this way, the thickness is 50 mm and the size is 3
After preparing a sample board of 00mm × 300mm, length 250m
A test specimen having a width of 120 mm and a width of 120 mm was taken, and a carbonization test was performed using a semi-closed electric furnace. The heating conditions at this time were as follows: heating to 800 ° C at a heating rate of 5 ° C / min and holding at that temperature for 60 minutes to form carbide; 800 ° C at a heating rate of 20 ° C / min.
And heated at that temperature for 360 minutes. The shape change, dimensional change rate, and the like of the molded carbide obtained by these methods were measured.

(Table 1) Shape change, dimensional change and weight loss rate of molded carbide温 Heating material Molded product Dimensions Volume Carbon velocity specific gravity Change rate Shrinkage Yield ────────────────────────────── ──── Test Example 1 5 ° C / min Wood 0.38 78.2 to 81.0% 49.3% 30.2% Test Example 2 20 ° C / min 発 生 Blistering and measurement not possible 29.3 Test Example 3 5 ° C / min Bark 0.39 78.7 to 82.8 47.6 38. 8 Test example 4 20 ° C / min 〃 0.35 77.6 to 82.3 46.6 39.3 ───────────────────────────────── ─ The bark boards produced under any of the conditions did not change much from the shape before heat treatment and carbonization.
However, in the case of a board made of wood and having a rapid heating rate, warping was slightly observed on the long side as compared with the shape before carbonization.

[Test Example 5] Using chip-shaped cedar bark waste material and finely pulverizing with a hammer mill, 0.85 mm
0.85 to 5.00mm
The particle size was used. Water content of this chip is about 50%
And after forming, insert into a normal hot press maintained at 190 ° C and heat-press at a pressure of about 40 kgf / cm2 for 5 minutes, then gradually reduce the pressure in 3 minutes, A self-adhesive board having a thickness of 6 mm, a specific gravity of 0.8 and a size of 300 mm × 300 mm was prepared. After curing at room temperature for one week, a test piece having a length of 250 mm and a width of 120 mm was taken from the board and subjected to a carbonization test in a closed electric furnace. The heating conditions during carbonization were heating to 800 ° C. at a rate of 1 ° C./min, and cooling was performed immediately after reaching the temperature to obtain a thin board-shaped formed carbide. As a result of measuring the shape change and dimensional change rate of the formed carbide obtained by this method, the volume shrinkage was 32.6%, and the carbon yield was 37.4%.
Thus, the shape of the formed carbide was such that the shape before the heat carbonization treatment was contracted as it was.

Test Example 6 Chip Larch Bark Waste
A hammer using a mixed chip of 85% and larch waste material 15%
After finely pulverizing with a mill, the mixture was sieved using 0.85 mm and 5.00 mm sieves, and particles having a particle size of 0.85 to 5.00 mm were used. After adjusting the moisture content of the chips to about 10%, forming the chips, and inserting them between hot plates of a steam injection type hot press maintained at a temperature of 180 ° C., about 5 kgf / cm 2
Heat pressure for 5 minutes at a pressure of 20mm thickness, specific gravity 0.4, size
A 300 mm × 300 mm self-adhesive board was prepared. At the time of hot pressing, a steam having a vapor pressure of 10 kgf / cm2 was sprayed between the hot plates for 30 seconds while the upper hot plate was in contact with the surface of the board to be pressed. After the low specific gravity board thus obtained was cured at room temperature for one week, a length of 250 mm and a width of
A 120 mm test piece was taken, and a carbonization test was performed using a semi-closed electric furnace. The heating conditions at that time were heating to 900 ° C. at a temperature increasing rate of 1 ° C./min, and cooling was performed immediately after reaching the temperature to obtain a board-shaped formed carbide. As a result of measuring the shape change and dimensional change rate of the formed carbide obtained by this method, the volume shrinkage was 43.2%, the carbon yield was 36.8%, and the shape of the formed carbide shrank as it was before the heating carbonization treatment It was like that. A sample obtained by cutting this molded carbide into a size of 50 mm x 50 mm was used as a sample, and added to 5 liters of a solution prepared by adding 500 ppm each of a drug such as dichloromethane, chloroform and trichloroethane to distilled water, and then placed at about 20 ° C. After shaking at room temperature for 24 hours, the concentration of the drug remaining in the solution was measured by a head space method using a GC / MS analyzer. As a result, 98% of all the chemicals were adsorbed on the formed carbide provided for the sample.

[Test Example 7] 55% moisture content pulverized into fibrous form
Diphenylmethane-siocyanate adhesive (manufactured by Nippon Polyurethane Co., Ltd., Millionate R-20)
0) was sprayed so as to be 5% of the dry base of the bark, subjected to foaming, inserted into a hot press equipped with a hemispherical mold having a radius of 60 mm and maintained at a temperature of 150 ° C., and inserted into a hot press of about 5 kgf. pressure for 5 minutes at a pressure of / cm2, thickness 10mm
Thus, a hemispherical shaped body having a specific gravity of 0.35 and a radius of 50 mm was produced. The thus-obtained low specific gravity board was cured at room temperature for one week, and then carbonized by heating in a semi-closed electric furnace maintained at a temperature of 400 ° C. The heating conditions at this time were heating to 400 ° C. at a rate of 1 ° C./min, reaching that temperature, and further heating for 180 minutes and then cooling to obtain a hemispherical shaped carbide. The radius of this hemispherical shaped carbide shrank to about 37 mm. Using the formed char as a filter, 300 ml of tap water in which 0.5% vegetable oil was suspended was filtered, and the remaining amount of vegetable oil was examined. As a result, 99.5% equivalent was removed.

[Test Example 8] Chipped cedar bark waste was finely pulverized by a hammer mill.
The mixture was filtered using a sieve having a particle size of 0.8 to 5.00 mm and used as a raw material. About 10% moisture content of this chip
After forming, it was inserted between the hot plates of a steam injection type hot press maintained at a temperature of 180 ° C. and hot-pressed at a pressure of about 5 kgf / cm 2 for 5 minutes to form a 15 mm thick sheet. specific gravity
A self-adhesive board having a size of 0.4 and a size of 300 mm × 300 mm was prepared. When applying heat, the upper hot plate contacts the surface of the board to be clamped, and at the same time, a steam of 10 kgf / cm2 is applied between the hot plates.
Injected for 30 seconds. The low specific gravity ball thus obtained
After curing the board at room temperature for one week, the board was subjected to a carbonization test using a semi-closed electric furnace. The heating conditions at that time were heating to 800 ° C. at a rate of temperature increase of 1 ° C./min, and cooling was performed immediately after reaching the temperature to obtain a board-shaped formed carbide. As a result of measuring the shape change and dimensional change ratio of the formed carbide obtained by this method, the volume shrinkage was 39.2%, the carbon yield was 41.3%, and the shape of the formed carbide contracted as it was before the heating carbonization treatment It was like that. 10mm thicker than the obtained molded carbide, 10
Ten test pieces having a size of 0 mm x 50 mm were cut out, and the formaldehyde absorption effect of the test pieces by a desiccator method was measured according to the method for measuring the amount of formaldehyde emitted from a particle board described in JIS A 5908. Was measured by the following method. That is, the internal volume is about 10 l
First, 37% formalin 350μ
was added to 5 ml of distilled water to prepare a diluted aqueous solution, and 0.5 ml of the diluted aqueous solution was dropped on a dish having a diameter of 30 mm, placed in a desiccator, and allowed to stand at a temperature of 20 ° C. for 24 hours. After confirming the above, put the 10 shaped carbides together with the same aqueous formaldehyde solution, and under the same conditions
The amount of formaldehyde emission when left for 24 hours was measured. As a result, the amount of formaldehyde emission decreased from 6.52 mg / l to 5.23 mg / l.

Test Example 9 After chip-shaped bagasse was further finely pulverized by a hammer mill, the sieve mesh was 1 mm.
After the fine chips under the sieve were adjusted to a moisture content of about 25%, a forming mat was formed on the call plate. It is inserted into a hot press maintained at 190 ° C and pressed at a pressure of about 40 kgf / cm2 for 2 minutes and then at a pressure of 3 kgf / cm2 for 3 minutes to obtain a thickness of 6 mm and specific gravity.
A circular self-adhesive board with a radius of 150 mm and a diameter of 0.65 was produced.
After curing for 1 week at room temperature, the mixture was placed in a closed electric furnace filled with nitrogen gas, heated to 900 ° C at a rate of 1.2 ° C / min, cooled immediately after reaching that temperature, and cooled to a circular shape. A molded carbide board was obtained. When the shape change of this board was measured, a carbonized board having a thickness of 4.3 mm and a radius of 107 mm was obtained.
Was obtained. The weight was reduced to 29.6% just before carbonization.

From the results of the above test examples, the chip-shaped or fibrous lignocellulose material was preliminarily formed into a plate or an arbitrary shape using an adhesive or the like, and the obtained molded body was heated or heated at a high temperature. It has been found that a molded carbide can be obtained in a state of being contracted as it is by heating and pressurizing without losing its shape. At that time, the bark that is usually discarded or incinerated or the stalks of a rarely used herbaceous plant are formed into chips or fibers, and an adhesive is added thereto and molded by a known method. It has also been found that by performing heating or heating and pressurizing treatment at a high temperature, a molded carbide having a high carbon yield and a small shrinkage after carbonization can be obtained.

Further, it has been found that the chips of the bark or herbaceous plant stem or the fibers of the bark or herbaceous plant stem can be formed by self-adhesion simply by placing them in a mold and heating and pressing without using an adhesive. It has been found that a formed carbide can be obtained at extremely low cost by heating or heating and pressurizing at high temperature and carbonizing the formed body while suppressing the supply of oxygen. In particular, it has been found that by suppressing the supply of oxygen during the carbonization process, it is possible to easily obtain a molded carbide that does not collapse and retains its shape before being subjected to the high-temperature treatment, although the shape is not reduced. .

Even if the bark or herbaceous plant stem chips or fibers are loosely joined to each other due to self-adhesion, solidification between the chips proceeds due to carbonization, resulting in a carbonized molded article having a strong bond. In addition, when bark, herbaceous plant stem chips and fibers are formed into compacts, they are heated and pressed while directly injecting steam between press hot plates or inside the mold to produce compacts with low specific gravity and high porosity. Since it can be easily obtained, the carbonized material is heated or heated and pressurized at a high temperature while suppressing the supply of oxygen, and carbonized, thereby obtaining a light-weight, fine-pored shaped carbide with a large amount of pores.

[0033]

As described above, the molded carbide and the method for producing the same according to the present invention can not only effectively utilize industrial wastes such as wood waste and bark or agricultural wastes such as rice straw, but also can be used as interior materials as building materials. It is possible to improve the indoor environment by using it as a part of the material, and it is also effective for water purification by removing trace amounts of harmful substances such as trihalomethane when used for water and sewage filter media. There is. In addition, a large-sized molded body can be obtained because it is once formed into a molded body and then heated or heated and pressurized to form a carbonized molded body. In addition, a carbonized molded article can be formed without using an adhesive at all when a molded article is formed, so that a low-cost environmental purification material can be provided.

In addition, the bark and herbaceous plant stalks are currently of little utility due to the shaped carbides and methods of their manufacture of the present invention, most of which are incinerated or discarded as industrial or agricultural waste. Although it is a source of pollution problems, the new use of bark and plant stems can help solve pollution problems that have been difficult to deal with.

Further, the shaped carbide obtained by the method of the present invention can be obtained in a form from a tile in the form of a plate to a plywood or a board having a size as large as a board usually used as a building material. As it is, it can be used as it is as an interior accent panel, and also as a flooring for homes, heartwood and ceiling materials for wall panels, etc. It can be used as a functional building material such as a purification effect and an electromagnetic wave shielding effect.

Further, by removing the formed carbide formed into a cylindrical shape into a pipe and flowing clean water or waste water through the pipe, harmful components such as trihalomethane contained in the clean water and waste oil in the waste water are removed. Also becomes possible. Furthermore, by making a self-adhesive bark molded body, the cost required for the adhesive is not required, and the cost can be reduced,
The effect of preventing the generation of harmful gas due to the burning of the adhesive during high-temperature heating can be obtained.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B27N 7/00 B27N 7/00 Z C01B 31/02 101 C01B 31/02 101A // C10B 53/02 C10B 53 / 02 (72) Inventor Koushiya Kikuchi 59-20 Torigoya, Noshiro-shi, Akita Prefecture (72) Inventor Masakazu Aoyama 4-4069, Hanasaki-cho, Asahikawa-shi, Hokkaido (72) Inventor Katsuo Suzuki 3-, Tsutsuji, Minamidori, Akita-shi, Akita 5 F term (reference) 2B250 AA01 AA06 AA19 AA40 BA09 FA21 FA37 HA01 2B260 AA20 BA03 BA05 BA07 BA18 BA19 CB03 CD02 CD04 CD30 EA05 EB02 EB06 EB12 EB21 EC18 4G032 AA12 AA57 BA00 GA01 GA06 GA12 4G046 CC00

Claims (7)

[Claims] 1. A chip-shaped and / or fibrous lignocellulose material is pressed to a specific gravity of 0.2 to 1.2 to form a molded body, and then the molded product is cut to 500 to 500 g under an oxygen cutoff.
A shaped carbide characterized by being carbonized by heating or heating and pressing at 1200 ° C. 2. The shaped carbide according to claim 1, wherein the chip-shaped and / or fibrous lignocellulosic material is mainly composed of bark and / or herbaceous plant stem. 3. Chip-shaped or fibrous bark or / and
And when the herbaceous plant stem is molded as the main raw material,
The molded carbide according to claim 2, wherein the molded body is formed by applying a pressure of 10 to 50 kgf / cm2 at ~ 250C. 4. A chip-shaped or / and fibrous lignocellulose material is pressed to a specific gravity of 0.2 to 1.2 to form a molded body, and then cut to a thickness of 500 to 500% under the cutoff of oxygen.
A method for producing a formed carbide, wherein the carbonization is performed by heating or heating and pressing at 1200 ° C. 5. The method according to claim 4, wherein the chip-shaped and / or fibrous lignocellulose material is mainly composed of bark and / or herbaceous plant stems. 6. Chip-like or fibrous bark and / or
And a material mainly composed of herbaceous plant stems,
The method for producing a molded carbide according to claim 5, wherein the molded article is a molded body formed by applying a pressure of 10 to 50 kgf / cm2 at a temperature of 10C. 7. When forming into a molded body using a chip-shaped or fibrous lignocellulose material or a material mainly composed of bark and / or herbaceous plant stem, the molded body is formed by heating and pressing while injecting steam. The method for producing a shaped carbide according to claim 4, wherein the method is a formed body.