JP5303698B2 - Carbide manufacturing method and carbide - Google Patents

Description

  The present invention relates to a carbide manufacturing method for producing carbonized carbide by firing corn cob, and a carbide obtained by firing and carbonizing corn cob.

Conventionally, as this kind of carbide, for example, one described in Patent Document 1 (Japanese Patent Laid-Open No. 11-302672) is known.
This carbide is mixed with mushroom waste medium with corn cob, dried for about 2 hours at a temperature of 90-95 ° C. while rotating in a rotary drier, and then naturally dried for about 8 hours at room temperature. The water content is about 20%. This dried waste medium is put into a kiln, carbonization is started at 350 to 450 ° C. while restricting the amount of air, and when 700 to 800 ° C. is reached, heating is stopped and cooling to room temperature is performed to obtain granular carbides. Thereafter, 10% by weight of starch paste is added to the carbide and mixed uniformly, placed in a mold, and air-dried at room temperature for about 3 days to form a cube of about 30 cm ³ .

  The carbides produced in this way are used for fuel, as well as for carbonization boards for building materials such as flooring, ceiling materials, soundproofing materials, moistureproofing materials, filters for air conditioning, water treatment, deodorization, etc. .

JP 11-302672 A

By the way, in the above-mentioned conventional carbide, corn cob is mixed with the mushroom waste medium and baked, so that the shape of the granular material easily collapses during the carbonization process, and starch paste is added to the mold and molded As a result, there is a problem that the porous state with many fine voids peculiar to corn cob cannot be fully utilized.
In addition, corn cob is mixed with mushroom waste medium and baked, so the size of the granular material is not in a certain range, and the use is limited to a narrow range such as fuel, relatively hard building materials and filters. As a result, it has become difficult to use it as an adsorbent and has a problem of poor versatility.

  The present invention has been made in view of this point, and is baked so that the porous state of the corncob can be maintained as much as possible, and the specific surface area can be increased to sufficiently exhibit the adsorption performance. It is an object of the present invention to provide a carbide manufacturing method and a carbide that are made uniform in size and easily applied to various uses, and have improved versatility.

In order to achieve such an object, the present invention provides a carbide production method for producing a carbide obtained by firing and carbonizing corn cob, and a subdividing step of subdividing the corn cob into a predetermined granule to produce a corn cob granule, a fractionation step in which the range of Said sub differentiation process in granular granulate size is fractionated into a plurality of groups each different granules, the granules respectively granulate of each population fractionated by該分specific process And a carbonization step of firing and carbonizing at a temperature of 1000 ° C. or lower while maintaining the shape as much as possible.

  Thereby, in a carbonization process, since a granular material is baked, the shape is kept as much as possible, the shape of the fragmented corn cob is not carbonized but carbonized as it is. Therefore, it is carbonized in a state where the microscopic voids peculiar to corn cob are retained, so that a porous state can be retained, the specific surface area can be increased, and the adsorption performance can be sufficiently exhibited. Become. Moreover, since the size range of the granular materials is sorted into a plurality of groups different from each other in the sorting step, the size of the baked and carbonized carbides is made uniform to some extent. Therefore, a carbide having a size corresponding to the application can be obtained, which can be easily applied to various applications, and versatility is improved.

  Further, when the corn cob is carbonized at a temperature of 700 ° C. or higher, the specific surface area is rapidly increased, and the corn cob becomes a carbide having a structure for enhancing the adsorption function (FIG. 5). This is because corn cob has a low lignin content, so it has a composition structure centered on hemicellulose and cellulose that are easily pyrolyzed. It tends to be a carbide with a large surface area. Further, the fact that the physical structure itself before carbonization is a delicate porous body is also a factor for increasing the specific surface area.

  Furthermore, as a characteristic of the corn cob with respect to the carbonization temperature, not only a high specific surface area can be obtained even when carbonized at 1000 ° C. or lower, but the carbonization is higher when carbonized at a temperature lower than 700 ° C., which is rather low compared to a high temperature. It is easy to become a carbide, and a carbide having high adsorption performance can be obtained at a wide range of carbonization temperatures. The reason for this is that corn cob has a three-layer structure of chaff, woody part, and pith, and the crystallinity of the carbide obtained from each is very high. Such a highly crystalline carbide has a stronger hydrophobic interaction with the ionic adsorbate, and therefore has higher adsorption performance than other carbides.

Thus, the corncob carbide exhibits extremely high performance adsorption performance compared to other carbides. That is, other carbides have the following problems.
(1) A specific surface area that enhances the adsorption capacity cannot be sufficiently secured only by the black coal technology that is fired at 1000 ° C. or less.
(2) Since the surface of “black coal” has a negative functional group, it is advantageous for adsorption of positive ions, but is not suitable as an anionic adsorbent.
(3) If “charcoal” having a function like “activated carbon” is to be manufactured, the carbonization temperature must be raised to 1000 ° C. or more, and an activation process must be performed to increase the specific surface area. Therefore, it is necessary to prepare advanced equipment such as an industrial firing furnace.
Therefore, it is not economical to try to cope with only the conventional coal production technology. Thus, it is not easy to make a new black coal having an adsorption characteristic superior to that of conventional black coal and a function equivalent to “activated carbon”. In the carbide according to the present invention, these problems can be solved.

And if necessary, in the above-mentioned subdividing step, a corn cob having a moisture content Q of 6% by mass ≦ Q ≦ 10% by mass is subdivided so that the maximum width D of the granular material becomes D ≦ 50 mm. It is set as the structure which becomes. That is, the size within this range has the best carbonization efficiency. On the other hand, if it is 50 mm or more, uneven carbonization tends to occur and handling becomes complicated.

Further, if necessary, in the sorting step, the maximum width D of the granular material is classified into a large grain group with D> 12 mm, a medium grain group with 12 mm ≧ D ≧ 5 mm, and a small grain group with D <5 mm. In this case, the carbide obtained by firing and carbonizing the large grain group has a size of about 5 mm to 12 mm, and the carbide obtained by firing and carbonizing the middle grain group has a size of about 3 mm to 8 mm. Thus, the carbonized carbide has a size of about 3 mm or less, and can be easily applied to various applications.

Further, if necessary, in the carbonization step, and on the heating plate made of metal which is heated from below, the structure is baked by the carbonization temperature to 500 ° C. to 900 ° C.. As described above, the corncob carbide can take a specific surface area several times higher than that obtained by carbonizing ordinary oak and cedar even at a carbonization temperature of 1000 ° C. or less. Insufficient surface area. Carbonization conditions of 700 ° C. or higher result in a higher specific surface area, and corn cob carbides have a specific surface area approximately five times that of a carbonization temperature of 800 ° C. Note that carbonization at a high temperature can provide a higher specific surface area, but if it exceeds 900 ° C., the economic effect is poor.

In this case, setting the carbonization temperature to 600 ° C. or higher and lower than 700 ° C. in the carbonization step is effective for obtaining a highly crystalline carbide.
From the test results to be described later, the graphitization peak of the carbide increases as the carbonization temperature increases from 500 ° C. to 700 ° C., whereas that peak is not observed in the carbide obtained at the carbonization temperature of 800 ° C. to 1000 ° C. I can't. In the case of corncob carbide, a peak indicating graphitization is clearly observed even when carbonized at a low temperature, and this is effective in this range.

  In order to achieve the above object, the present invention provides a carbide obtained by firing corncob and carbonizing the corncob into a predetermined granule, and firing the granule at a temperature of 1000 ° C. or lower while maintaining the shape of the granular material. And carbonized.

  Thereby, there exists an effect | action similar to the above and an effect. That is, since the granular material is fired while its shape is kept as much as possible, the shape of the subdivided corn cob is not carbonized and is carbonized as it is. Therefore, it is carbonized in a state where the microscopic voids peculiar to corn cob are retained, so that a porous state can be retained, the specific surface area can be increased, and the adsorption performance can be sufficiently exhibited. Become.

  And it is set as the structure which made the said carbonization temperature 500-900 degreeC as needed. In this case, it is effective to set the carbonization temperature to 600 ° C. or higher and lower than 700 ° C. The same operations and effects as described above are achieved.

Further, if necessary, the maximum width D of the subdivided granular material is D ≦ 50 mm. In this case, the granular material is configured to extract either a large particle group in which the maximum width D of the granular material is D> 12 mm or a medium particle group of 12 mm ≧ D ≧ 5 mm . The same operations and effects as described above are achieved.
More specifically, the carbide according to the present invention is a carbide obtained by calcining corn cob and carbonized using a corn cob having a moisture content Q of 6% by mass ≦ Q ≦ 10% by mass. A metal heating plate in which D is subdivided so that D ≦ 50 mm, a large particle population with D> 12 mm is extracted by fractionation, and the granular material subdivided into predetermined particles is heated from below. In the above, carbonization temperature is set to 500 ° C. to 900 ° C. while keeping the shape of the granular material as much as possible, and the size is set to 5 mm to 12 mm.
In addition, the carbide according to the present invention is a carbide obtained by firing and carbonizing corn cob, and the corn cob has a moisture content Q of 6 mass% ≦ Q ≦ 10 mass%, and the maximum width D of the granular material is D On the metal heating plate heated from the lower side, the particles are subdivided to be ≦ 50 mm, and a medium particle group of 12 mm ≧ D ≧ 5 mm is extracted by fractionation, and this granular material subdivided into predetermined particles The carbonization temperature is set to 500 ° C. to 900 ° C. while keeping the shape of the granular material as much as possible to obtain a size of 3 mm to 8 mm.

And if needed, it is the carbide | carbonized_material which carbonized the granular material of the said large-sized group, Comprising: It is set as the structure mixed with compost.
If necessary, a carbide carbonized particulate matter in said particle population, it is configured to be mixed in the laid floor livestock.

  According to the method for producing carbide and the carbide of the present invention, the granular material is fired while its shape is kept as much as possible, so that it is carbonized as it is without breaking the shape of the fragmented corn cob. Therefore, it is carbonized in a state where the microscopic voids peculiar to corn cob are retained, so that a porous state can be retained, the specific surface area can be increased, and the adsorption performance can be sufficiently exhibited. Become.

  Further, in the carbide manufacturing method of the present invention, the size range of the particulate matter is separated into a plurality of different groups in the separation step, so that the size of the calcinated and carbonized carbide is made uniform to some extent. Can do. Therefore, a carbide having a size corresponding to the application can be obtained, and it can be easily applied to various applications, and versatility can be greatly improved.

Hereinafter, a carbide manufacturing method and carbide according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG.1 and FIG.2, the manufacturing method of the carbide | carbonized_material which concerns on embodiment of this invention is a manufacturing method of the carbide | carbonized_material which manufactures the carbide | carbonized_material which baked the corn cob C, Comprising: Comprising: Subdivision process (1) And a fractionation step (2) and a carbonization step (3). Hereinafter, each step will be described.

(1) Subdivision process As shown in FIG. 1, the corn cob C is subdivided into a predetermined granule to produce a corn cob C granule. The corn cob C is a core obtained by removing corn berries with a machine, and this corn cob C is primarily stored in a silo or the like. Moreover, the corn cob C to be used is dried in advance, and, for example, the moisture content Q is about 8% by mass. The water content Q is preferably 6% by mass ≦ Q ≦ 10% by mass.
The subdivision is performed using a known crusher so that the maximum width D of the granular material is D ≦ 50 mm.

(2) Separation process The granular material subdivided in the subdivision process is classified into a plurality of groups of granular materials each having a different size range. For example, using a known sieve, the maximum width D of the granular material is classified into three types: a large particle population S1 with D> 12 mm, a medium particle population S2 with 12 mm ≧ D ≧ 5 mm, and a small particle population S3 with D <5 mm.

(3) Carbonization step At least one of the plurality of groups separated in the separation process is calcined by firing at a temperature of 1000 ° C. or lower while maintaining the shape of the particles as much as possible. The carbide T according to the embodiment of the present invention is obtained. In the embodiment, the carbonization treatment is performed by classifying three types of groups, that is, the large grain group S1, the medium grain group S2, and the small grain group S3. In the carbonization step, the carbonization temperature is set to 500 ° C. to 900 ° C., and desirably 600 ° C. or more and less than 700 ° C.

  As shown in FIGS. 3 and 4, carbonization is performed in a carbonization furnace 1 of a so-called “neterma type carbonization apparatus” in the large grain group S1, the medium grain group S2, or the small grain group S3. The carbonization furnace 1 carbonizes the granular material of corn cob C on a metal heating plate 2 heated from below. The heating plate 2 is formed in a mountain shape in cross section and is supported by a frame body 4 having an ignition tray 3. The heating plate 2 can be opened and closed on the lower end 2 a side via the hinge 5, and the lower end 2 a side is opened to put a fire into the ignition tray 3. The fire type is ignited and the corn cob C granular material is placed on the heating plate 2. It takes about 15 hours from ignition to carbonization, and during that time, in order to avoid complete combustion, it is appropriately turned over and steamed. The carbonization temperature is as high as 600 ° C. to less than 700 ° C. and complete carbonization is possible. After carbonization, digest and further add water to lower the temperature. The added water evaporates naturally.

  Thus, the carbide T obtained by firing and carbonizing the large grain group S1 has a size of about 5 mm to 12 mm, and the carbide T obtained by firing and carbonizing the middle grain group S2 has a size of about 3 mm to 8 mm. Thus, the carbide T obtained by firing and carbonizing the small grain group S3 has a size of about 3 mm or less.

  As shown in FIG. 2, according to the carbide T according to the embodiment of the present invention, the granular material of the corn cob C is fired while its shape is held as much as possible. It is carbonized as it is without breaking. Therefore, it is carbonized in a state where the microscopic voids peculiar to corn cob are retained, so that a porous state can be retained, the specific surface area can be increased, and the adsorption performance can be sufficiently exhibited. Become.

  Further, since the size range of the granular materials is sorted into different groups in the sorting step, the size of the baked and carbonized carbide T can be made uniform to some extent. Therefore, the carbide | carbonized_material T of the magnitude | size according to a use can be obtained, it becomes easy to apply to various uses, and versatility can be improved significantly.

  Specifically, for example, the carbide T obtained by carbonizing the particulate matter of the large grain group S1 is mixed with compost. Thereby, compost becomes easy to mature fully and quality is improved. It is also useful as a gas adsorbent for facilities such as livestock barns, water purification of sewage liquid, and soil conditioner in agricultural areas.

Further, for example, the carbide T obtained by carbonizing the particulate matter of the medium grain population S2 is mixed with the floor of the livestock. When the carbide T of corn cob C is used as a material for a floor of a barn, ammonia absorption and moisture absorption of excrement are good. In addition, this floor is fast composting and of good quality. The porous body of the carbide T of corn cob C is advantageous for moisture and gas adsorption. In addition, because it is 3mm to 8mm in granular form, it absorbs moisture very well when used on the floor of a barn, and it is a porous material with many mesopores (2 to 50nm), making compost. In many cases, a large number of microorganisms can be supported, and as a result, a fully matured compost can be produced in a short period of time.

Furthermore, for example, the carbide T obtained by carbonizing the granular material of the small particle population S3 is mixed with the fungus bed of straw. That is, it works effectively as a fungus bed improver. In addition, because of its low specific gravity, it is also useful as a snow melting agent that is sprayed on the remaining snow in early spring, and after use, it remains on the farmland as it is and serves as a soil conditioner. Furthermore, it is a carbide obtained by carbonizing the granular material of the small particle group S3, and is mixed with wood powder as a gas adsorbent.
In addition, in each carbide T, in order to use it as a gas adsorbent in a barn, a usage method for removing ammonia odor by mixing alone or mixed with wood vinegar or mixed with wood powder or other activated carbon is also useful. . It is also useful to mix in feed.

[Experimental example]
Next, experimental examples will be described. We examine the effectiveness of carbide T from corn cob C by carbonizing corn cob C and verifying its physical properties.

1. Experimental method 1-1. Experimental material Chinese imported corn cob C was used. The water content Q was Q = 8% by mass.

1-2. Carbonization method The corn cob C itself or the chaff, pith, and wood part constituting the corn cob C were placed in an electric furnace (a tabletop vacuum gas replacement furnace KDF75 type manufactured by Denken Co., Ltd.) for carbonization. Carbonization was performed in a nitrogen stream (1.5 dm ³ / min), the temperature was raised to a carbonization reaction temperature at a heating rate of 400 ° C./h, the temperature was maintained for 30 minutes after reaching the carbonization temperature, and then naturally cooled. The carbonization temperature conditions are 500, 600, 700, 800, 900, and 1000 ° C. In the experimental example, the carbide T was in a powder form.

2. Various measurements 1) Specific surface area Using a rapid surface area measuring apparatus (SA-1100 model manufactured by Shibata Kagaku Kikai Kogyo Co., Ltd.), the specific surface area was determined by the BET single point method of nitrogen adsorption.
The results are shown in FIG. From this result, the specific surface area of the carbide T obtained from the corn cob C compared with that obtained by normal carbonization of oak and cedar shows a very high value, and a large difference is seen particularly in the carbonization conditions of 700 ° C. or higher. It was. That is, when compared at a carbonization temperature of 800 ° C., the carbide T of corn cob C has a specific surface area about five times as large. From this, it was found that the carbide T of corn cob C can have a specific surface area several times higher than that of ordinary black coal even at a carbonization temperature of 1000 ° C. or less. A large specific surface area means that there are many adsorption sites for the substance, and it is expected that the adsorption capacity is high.

2) X-ray diffraction (XRD)
The crystallinity of charcoal was evaluated by determining the peak of the graphite portion using CuKα rays in a powder X-ray diffractometer (RINT2200 type, manufactured by Rigaku Corporation).
The results are shown in FIG. While the graphitization peak of the carbide T increases as the carbonization temperature increases from 500 ° C. to 700 ° C., the peak is not observed in the carbide T obtained at the carbonization temperature of 800 ° C. to 1000 ° C. (FIG. ▼ in 3).
In the case of normal black charcoal, the higher the temperature, the higher the crystallinity, and a slight tendency to graphitize. However, in the case of the carbide T of corn cob C, a peak indicating graphitization appears clearly even when carbonized at a low temperature, and it is considered that different carbonization occurs in the conventional carbonization process. This is a major feature of the corn cob C carbide T.

3) Dye adsorption After the obtained charcoal was pulverized to 100 mesh or less and dried at 105 ° C for 24 hours, a dye adsorption experiment was conducted by the following method. As the dye, two kinds of dyes were used: the cationic dye methylene blue shown in FIG. 7A and the anionic dye Orange II shown in FIG. 7B. In the dye adsorption experiment, a powdery charcoal sample was added to a 100 cm ³ Erlenmeyer flask containing 25 cm ³ of an aqueous solution of methylene blue or orange II with an initial concentration of 200 μmol / dm ³ , shaken lightly, and then allowed to stand at room temperature for 24 h. I went. After standing, the solution is centrifuged at 2,000 rpm for 20 minutes, and the dye concentration in the liquid phase is quantified with an absorptiometer (U-2000 type double beam spectrophotometer manufactured by Hitachi, Ltd.) to determine the amount of dye adsorbed. It was calculated by the following formula.

Dye adsorption amount (μmol / g) = {initial concentration (μmol / dm ³ ) −post-adsorption concentration (μmol / dm ³ )} ÷ weight of charcoal (g)

  The results for methylene blue are shown in FIG. Methylene blue, a cationic dye, is easy to chemically adsorb with charcoal, so it adsorbs relatively well. However, as shown in FIG. 8, even with ordinary black coal, dye adsorption does not occur unless the carbonization temperature is 800 ° C. or higher. On the other hand, in the case of the carbide T of corn cob C, about 50% dye adsorption was observed even at a carbonization temperature of 800 ° C. or less, and it was found that there was high adsorption performance.

  Moreover, the result of Orange II is shown in FIG. In the case of Orange II, which is an anionic dye (FIG. 5), when compared with carbide T at 800 ° C., the adsorption property of the dye was 9 times or more, and it was found that the adsorption ability of carbide T of corn cob C was high.

4) Moisture absorption amount Carbide T obtained under various conditions was placed in a constant temperature and humidity chamber at a humidity of 65% and a temperature of 25 ° C. from the absolutely dry state, and the moisture absorption characteristics were determined from the change in weight over time.
The results are shown in FIG. At any carbonization temperature, the carbide T of corn cob C shows a higher moisture absorption than cedar charcoal. From this, it was found that the carbide T obtained from corn cob C has higher moisture absorption characteristics.

3. Conclusion From the above experiment, the following can be said.
1) The carbide T of corn cob C tends to have a very large specific surface area compared with black coal.
2) From corn cob C, carbide T having high crystallinity can be obtained even under low temperature carbonization conditions of 800 ° C. or lower, and thus charcoal having high adsorption performance can be obtained under a wide range of carbonization temperature conditions.
3) The moisture absorption performance tends to be very high compared to other black coals.

  Of course, the use of the carbide T is not limited to that described above, and may be changed as appropriate.

  In recent years, the industrial waste discharged from the agricultural field is mainly made of cellulose, which is the same quality as wood, so the expectation of “Carbide” is increasing in forming a recycling industry that can be reduced to the soil. ing. Specifically, a porous carbide T such as “activated carbon” having a large specific surface area is required. Corn cob C is imported in large quantities as a fungus bed instead of sawdust and conventionally incinerated after being used several times. The carbide T of the present invention is used or unused corn cob C. Thus, a new functional carbide T having the same adsorption ability as that of “activated carbon” can be obtained. That is, the carbide T of the present invention is excellent in adsorption of ionic dyes and BPA which is a kind of environmental hormone, has high moisture absorption performance, and can be effectively used in various places. For example, as an application example utilizing the high adsorption performance, there is utilization to the floor of a barn, thereby reducing the ammonia smell of the barn and shortening the composting time, which is extremely useful.

It is a figure which shows the manufacturing method of the carbide | carbonized_material which concerns on embodiment of this invention. It is a figure which shows the carbide | carbonized_material which concerns on embodiment of this invention while showing the manufacturing method of the carbide | carbonized_material which concerns on embodiment of this invention. It is a perspective view which shows an example of the carbonization furnace to be used in the manufacturing method of the carbide | carbonized_material which concerns on embodiment of this invention. It is a disassembled perspective view which shows the principal part of an example of the carbonization furnace to be used in the manufacturing method of the carbide | carbonized_material which concerns on embodiment of this invention. It is a graph which shows the relationship between the carbonization temperature and a specific surface area according to the experimental example of the present invention. It is an XRD figure of the corncob carbide in each carbonization temperature concerning the experiment example of this invention. It is a figure which shows the chemical formula of the used dye concerning the dye adsorption experiment example of this invention, (a) shows methylene blue, (b) shows orange II. It is a graph which shows the relationship between the carbonization temperature and the adsorption rate of methylene blue according to the experimental example of the present invention. It is a graph which shows the relationship between the carbonization temperature and the adsorption rate of Orange II in the experimental example of the present invention. It is a graph which shows the relationship between carbonization temperature and a moisture absorption rate in connection with the experiment example of this invention.

Explanation of symbols

C Corn Cobb T Carbide (1) Subdivision process (2) Fractionation process (3) Carbonization process S1 Large grain group S2 Medium grain group S3 Small grain group 1 Carbonization furnace 2 Heating plate 3 Igniter 4 Frame

Claims (7)

In the method for producing a carbide for producing a carbide obtained by firing corn cob,
The subdivision process of subdividing the corn cob into a predetermined granule to produce a corn cob granule, and the separation of the subdivided granule into a plurality of groups of granule having different size ranges e Bei a step, a carbonization step and fired at該分another step in fractionated granules respectively granulate 1000 ° C. or less of the temperature while as much as possible retain the shape of each population carbonization,
In the above-mentioned subdividing step, a corn cob having a water content Q of 6% by mass ≦ Q ≦ 10% by mass is subdivided so that the maximum width D of the granular material is D ≦ 50 mm.
In the above sorting step, the maximum width D of the granular material is sorted into a large grain population with D> 12 mm, a middle grain population with 12 mm ≧ D ≧ 5 mm, and a small grain population with D <5 mm,
In the carbonization step, on the metal heating plate heated from the lower side, the carbonization temperature is set to 500 ° C. to 900 ° C. and carbonized . The method for producing carbide according to claim 1 , wherein the carbonization temperature is set to 600 ° C or higher and lower than 700 ° C in the carbonization step. In the carbide which burned and carbonized corncob,
A corn cob with a moisture content Q of 6% by mass ≦ Q ≦ 10% by mass is subdivided so that the maximum width D of the granular material is D ≦ 50 mm, and a large group of D> 12 mm by fractionation The carbonized material is subdivided into predetermined particles, and the carbonization temperature is set to 500 ° C. to 900 ° C. while maintaining the shape of the particles as much as possible on a metal heating plate heated from below. A carbide characterized by being carbonized at a temperature of 5 mm to 12 mm . The carbide according to claim 3 , wherein the carbide is obtained by carbonizing the particles of the large population and mixed with compost.   In the carbide which burned and carbonized corncob,
  A corn cob having a moisture content Q of 6% by mass ≦ Q ≦ 10% by mass is subdivided so that the maximum width D of the granular material becomes D ≦ 50 mm, and by sorting, 12 mm ≧ D ≧ 5 mm An intermediate grain group is extracted, and the granular material that has been subdivided into predetermined grains is heated on a metal heating plate heated from the lower side while maintaining the shape of the granular substance as much as possible at a carbonization temperature of 500. A carbide characterized in that it is carbonized at a temperature of from 3 to 8 ° C. to a size of 3 to 8 mm. The carbide according to claim 5 , wherein the carbide is obtained by carbonizing the medium-sized granular material and is mixed with a livestock floor. The carbide according to any one of claims 3 to 6, wherein the carbonization temperature is set to 600 ° C or higher and lower than 700 ° C.

Images