JP3126633B2 - Carbonization furnace, carbide obtained in this carbonization furnace and adsorbent containing this carbide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbonization furnace for carbonizing a carbonized material such as pine, and a carbide obtained by the carbonization furnace.
And an adsorbent containing the carbide as a component.

[0002]

2. Description of the Related Art There are two methods for carbonizing a carbonized material, namely, combustion by restricting the supply of air (oxygen) or heat from the outside by shutting off air. The former is a method widely known as "charcoal burning" since ancient times, and the latter is a chemical "carbonization" performed on coal to obtain coke, coal gas and tar.

[0003] "Distillation" is a method of accelerating the decomposition of carbonized material by externally applied heat, whereas "charcoal firing"
The carbonization proceeds by natural carbonization (this is called ignition or ignition) that occurs when the carbonized material is heated to 270 ° C. or more by the heat of combustion of the combustion material in the initial stage of the process, and thereafter, in principle, heating by combustion of the combustion material There is a big difference in that the is unnecessary. Natural carbonization is a phenomenon in which holocellulose (cellulose / hemicellulose) in carbonized material decomposes at 275 ° C or higher, and the heat of decomposition (150-200 Kcal / Kg of carbon material) further promotes carbonization. Occurs when the temperature rises due to the combustion of the gas generated in the step.

[0004] In the above-mentioned charcoal burning, temperature control is very difficult, and there are many parts depending on experience and feeling. For example, smoke emanating from a flue to estimate the state or temperature in a kiln by smoke is classified as water smoke-fluffy smoke-fluffy smoke-white smoke-white blue smoke-blue smoke-asagi-out of smoke, etc. I have. Flue smoke has a flue gas temperature of 80-82 ° C, kiln temperature (about 10cm below the ceiling) 320-350 ° C at the stage where the burning material burns and ignites. At the stage where the flue gas temperature is 82-100 ° C, the temperature inside the kiln is 350-400
℃, this flue smoke smoke temperature 100-170 ℃, white smoke smoke temperature 180-230 ℃, kiln temperature 450-500
When the smoke temperature exceeds 220 ° C., the decomposition of lignin starts, and the white and blue smoke has a stack temperature of 230-250 ° C., the kiln temperature is 500-530 ° C., and the blue smoke has a stack temperature of 260-300.
℃, kiln temperature of 540-570 ° C, start time of scouring (normalization) work, Asagi smoke 330-350 ° C, kiln temperature 600-680 ° C.
The temperature is 380 ° C and the furnace temperature is 700 to 800 ° C.

[0005] The above is the temperature of carbonization in a charcoal kiln in Japan. There is an important relationship between the carbonization temperature and the charcoal quality. At a carbonization temperature of 105 ° C, the charcoal yield is 100% and the distillate yield is 0%. , Gas yield 0%, charcoal yield 9 at carbonization temperature 200 ° C
9.2%, distillate yield 0.2%, gas yield 0.6%, charcoal yield 34.0% at carbonization temperature 400 ° C, distillate yield 4
9.2%, gas yield 16.6%, charcoal yield 29.5% at distilling temperature 500 ° C, distillate yield 51.1%, gas yield 1
9.4%, the charcoal yield was 25.6% at a carbonization temperature of 800 ° C, the distillate yield was 50.7%, and the gas yield was 23.7%. The components (ash, carbon, hydrogen, A large difference also occurs in iodine adsorption.

[0006] Activated carbon is widely used as various adsorbents because of its large surface area and excellent adsorption performance.
To produce activated carbon, for example, as a pre-carbonization treatment, after performing a treatment of impregnating the carbonized material with a mixture of zinc chloride, phosphoric acid, and phosphoric acid and sulfuric acid, carbonization is performed at a temperature of 750 to 1000 ° C. Further washing with dilute sulfuric acid and water as post-treatment,
80 charcoal with constant circulation of steam or carbon dioxide
A method of keeping the temperature at about 0 to 1000 ° C. for about 1 to 2 hours is known.

[0007]

As described above, in charcoal firing, the construction of a black charcoal kiln or a white charcoal kiln requires the following:
Not only does it require very difficult techniques, including the selection of construction sites and soil / stone based on the wind direction, but it is also more difficult to control the temperature. And a significant difference in the performance of the resulting charcoal.

[0008] Further, it is necessary to carry out carbonization treatment to obtain carbonized wood species and properties suitable for the purpose of charcoal, and know-how accumulated over many years is required, so-called training is required. It is not something you can do.

[0009] Looking at Yamano in Japan, the greens appear to be rich and rich, but the fact is that it is in disrepair. This is due to a sharp decrease in the use of vegetation as fuel and compost, a decrease in the use of domestic timber for building materials, a change from logs such as scaffolding to iron pipes, and a sharp decrease in forestry workers. In recent years, the influence of acid rain has been emphasized.

[0010] In particular, there is a concern that pine wilt is progressing nationwide, and that the era once loved by Aomatsu white sand may become a legacy of the past.

There is a theory that pine wilt is caused by pine woodpeckers (generally pine worms), but the main cause has not always been identified. It is considered that pine pine is nesting in the dead pine, but Masanobu Fukuoka of Ehime, who is famous as a practitioner of natural farming, says that changes in soil properties due to acid rain etc. Inhibition of the healthy activity of the roots of pine trees, and the infestation of the pine tree by the pine tree, which cannot be invaded by healthy pine trees. It is argued that spraying chemicals to prevent germination alone does not solve the problem, and that soil modification around pine roots is the ultimate solution.

[0012] In Niigata Prefecture, etc., the withering of plants that require mycorrhizal fungi to vegetate their roots such as oak trees has become noticeable, and according to research, snow has the effect of concentrating acidic substances and the like. It has been found that as a result of having an adverse effect on the root fungus, the root activity is lost and the root fungus dies.
This theory is likely to apply to pine.

Whatever the main cause of such withering,
It is a fact that the number of withering pine trees is increasing rapidly, and if left unchecked, pine woodpeckers will be generated in large quantities, and the extinction of pine trees has become a real problem. ing.

As a countermeasure at the present stage, in a pine known as precious wood, a pipe is guided to the top of the tree to spray a chemical, and this technique is applied to ordinary pine in Yamano. Doing so presents a problem in terms of preventing contamination by chemicals. Therefore, it is recommended that pine trees close to wilt be cut off and the bark be immediately removed to prevent spawning of the pine woodpecker. However, in this method, pine wood is left only by cutting and peeling,
It is a loss of pine wood as a resource, and no financial backing such as wage allowance for workers can be guaranteed.

In view of the above-mentioned circumstances, the present inventor has obtained an idea to secure financial backing of a measure for preventing the spread of withering by using plants such as pine that is withering or on the verge of dying as carbonized material. This has led to the present invention.

As described above, the carbonization process (charcoal baking) requires not only a very difficult technique but also a considerable burden on equipment costs, so that it is not an area where an amateur can easily enter. Then, the present inventor has arrived at the present invention for the purpose of providing a carbonization furnace that can be operated even by an amateur according to a manual. Carbonization furnaces that can be operated by laymen, local forestry unions, agricultural unions,
If it can be easily used by leasing by public organizations, etc., it can be used not only for carbonization of dead pine, but also for carbonization of expensive species, reducing financial burden and promoting village development. Is also considered effective.

Further, if the carbonization furnace of the present invention is used, a good carbide can be produced by a simple operation. By producing an adsorbent from this carbide, it can be widely used in homes, offices, factories and the like. In addition, it can be used as a soil improvement material in a mountain field where withering has occurred.

As is clear from the above, the present invention clarifies a carbonization furnace capable of obtaining high-quality coal usable as an adsorbent by a simple operation, and utilizes carbon produced by the carbonization furnace. The purpose is to identify the adsorbent.

[0019]

The carbonization furnace according to the present invention comprises:
Gas in the furnace is sucked by an ejector located below the carbonization furnace body, and a burner flame is introduced into the furnace while the gas in the furnace is guided to the flue tube to carbonize the carbonized material placed in the furnace. It is characterized by. A preferred embodiment of the carbonization furnace according to the present invention is characterized in that the wall, bottom and lid of the carbonization furnace are water-cooled. Further, the carbide according to the present invention is a carbide obtained in the above-mentioned carbonization furnace, and is used as an adsorbent A having the following configuration, and does not have a smell of ammonia when the following experiment A is performed. [Adsorbent A] (1) Carbide powder 52 wt%, (2) SiO ₂ ··· 69.38 wt%, Al ₂ O ₃ ··· 1
_{1.02wt%, Fe 2 O 3 ··} 0.92wt%, MgO
0.60 wt%, CaO 1.31 wt%, Na
_{2 O ·· 3.34wt%, K 2} O ·· 3.17wt%, H
Firing the obtained by crushing the ₂ O ·· _10.13wt% of natural zeolite powder, powdered and the ones 35 wt%, (3) a binder 13 wt% of the mixture, adsorbent form kneading such as sodium silicate. [Experiment A] Ammonia at a concentration of 10 ppm was sealed in a closed container having a volume of 0.08 m ³ , and 700 g of the adsorbent was left in this container. Odor is felt at a concentration of 5 to 10 ppm.) Further, the adsorbent according to the present invention comprises: (1) 52 wt% of a pulverized carbide obtained in the above carbonization furnace; (2) SiO ₂ .69.38 wt%; Al ₂ O ₃ .11.0
_{2wt%, Fe 2 O 3 ··} 0.92wt%, MgO ··
0.60wt%, CaO ·· 1.31wt%, Na 2 O
··· 3.34 wt%, K ₂ O ··· 3.17 wt%, H ₂ O
..35w of 10.13wt% natural zeolite powder
After admixing t% and kneading using 13 wt% of a binder, the mixture is molded by a molding machine, and is calcined to obtain an adsorbent. When the following experiment A is performed, no ammonia smell is felt. Adsorbent. [Experiment A] Ammonia at a concentration of 10 ppm was sealed in a closed container having a volume of 0.08 m ³ , and 700 g of the adsorbent was left in this container. Odor is felt at a concentration of 5 to 10 ppm.) A preferred embodiment of the adsorbent according to the present invention is characterized in that calcium and / or alumina are added.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The production process of an adsorbent according to the present invention will be described with reference to the flowchart shown in FIG. Step A
Is a process for producing a carbide used as an adsorbent, Step B is a process for processing a natural zeolite, and Step C is a process for producing an adsorbent.

As the raw wood used as the carbonized material, as described above, pine wood, oak wood and beech wood that have fallen first are used, but the raw material used is not limited. Logs are cut and pruned and cut into a certain length, for example, 30 to 100 cm. If the thickness exceeds 10cm, use it as a split material.
If the carbonization treatment is performed without cracking, remarkable cost reduction can be achieved. Also, the dropped branch material can be cut into a suitable length and used as a carbonized material. It is not necessary to peel off the bark as it is.

The carbonizing process is performed by a carbonizing furnace shown in FIG.

In FIG. 2, reference numeral 1 denotes a carbonization furnace main body, which is preferably made of stainless steel and formed as a bottomed cylindrical body, and mounted on a base as shown in the figure. 2 is a basket for placing carbonized material, 3 is a burner of kerosene or heavy oil, 4 is a hot air passage, 5 is a temperature control butterfly valve, 6 is a suction turbo fan, 7 is a valve for extracting wood vinegar, 8 is a safety valve, and 9 is a valve for extracting wood vinegar. , 10 is a yield slice valve, 11 is a flue tube, 12
Is a lid, 13 is a jinkasa, 14 is a burner control thermometer, and 15 to 15.
18 is a thermometer, 19 is an anometer, 20 is a water cooling inlet,
21 is a water-cooled overflow, 22 is a water-cooled inlet, and 23 is a water-cooled overflow.

The carbonized material is stored in the basket 2, the lid 12 is opened and the carbonized material is placed in the carbonization furnace main body 1. Inside the carbonization furnace main body 1
The flame from the burner 3 is introduced through the hot air passage 4 and heated.

The heating temperature is, for example, about 180 ° C. in the primary operation of about 4 hours, and 28 ° C. in the secondary operation of 4 to 5 hours.
It is about 0 ° C. That is, the carbide according to the present invention contains 160
After the primary operation of about ~ 200 ° C, 260 ~ 500 ° C
It is a carbon substance obtained by secondary operation of the order, and its specific gravity is about 1/5 to 1/3 of activated carbon. The heating temperature corresponds to the tree species and the degree of drying, but is lower than the normal charcoal burning temperature. The heating temperature also corresponds to the size of the carbonized material to be carbonized. In other words, in the case of traditional charcoal grilling, the size of the carbonized material is about the size of a fist, about 10 cm, as described above. However, in the case of carbonization of dead pine wood, if split wood is used, the labor will increase by that much. If carbonization can be performed while the raw wood is cut into slices, the labor cost can be significantly reduced.

By driving the suction turbo fan 6,
An ejector is formed at the upper part of the wood vinegar extraction valve 7, and a suction force is generated by the action of the ejector, and the inside of the carbonization furnace 1 is evacuated. Therefore, even if the carbonized material is disposed inside the carbonizing furnace 1 and the flame of the burner 3 is introduced, the carbonized material and the gas generated from the carbonized material will not burn due to insufficient air.

The gas of the flame of the burner 3 introduced into the carbonization furnace 1 and the gas generated from the carbonized material are guided to the flue pipe 11 through the bottom of the carbonization furnace 1 by the action of the ejector. Since the flue pipe 11 is provided with a water cooling means, the gas passing therethrough is cooled, and the wood vinegar and tar can be separated and collected.

The flue tube 11 may be provided with a combustion chamber as a smoke-eliminating device to perform gas combustion. In order to further improve the efficiency of the fuel, a method is used in which the combustible gas generated from the carbonized material is guided to the burner 3 from the flue pipe 11 through the guide pipe and burned.

[0029] Wall and bottom of carbonization furnace 1, lid 12 (Jinkasa 13)
Is water cooled. This is to prevent the temperature of the furnace from rising due to the introduction of the flame of the burner 3, thereby preventing the metal material forming the furnace from glowing and shortening the operating years.
This is for cooling at the end of the carbonization process. Coating the inner wall or bottom of the carbonization furnace 1 with a refractory material such as a refractory brick is also effective for extending the service life.

Next, the steps of the carbonization treatment by the above-described carbonization furnace will be described. Set of carbonized material: The carbonized material adjusted to a predetermined length and diameter is housed in a metal basket 2 and introduced into the furnace from the top with the lid 12 opened. When the setting of carbonized material is completed, lid 1
2 and the inside of the furnace is sealed.

Operation of the ejector: When the setting of the carbonized material is completed, the ejector is activated. The ejector converts the jet generated by driving the suction turbofan 6 into a flue pipe 11.
A strong suction force is generated by jetting into a guide tube leading to the furnace, and the suction force sucks air in the furnace.

Operation of the burner: After the ejector has been driven for a certain period of time, the burner 3 is driven when the degree of vacuum in the furnace has increased, and a flame is introduced into the furnace through the hot air path 4 to raise the furnace temperature. .

Start of natural carbonization: The furnace temperature rises due to the introduction of the flame, and when the temperature of the carbonized material exceeds 275 ° C., natural carbonization starts. At this stage, the operation of the burner 3 may be intermittent only for adjusting the furnace temperature.

Beginning of decomposition of lignin: After natural carbonization starts, it reaches a stage where white smoke can be seen from the flue (this stage is reached based on the quantity and quality of the stored carbonized material (tree species / water content) The burner 3 is operated to further raise the furnace temperature, thereby decomposing lignin.

Cooling / digestion: Cooling / digesting is carried out a predetermined time after the start of lignin decomposition. In this case,
You can do the scouring that is performed by Japanese charcoal making technique. The technique of scouring is different depending on the type of charcoal and black charcoal, but both can be performed by the opening and closing operation of the lid 13 of the lid 12 and the operation of introducing the outside air by operating the flue tube 11 by the end slice valve 10.

The carbide is taken out of the furnace and pulverized. Since the pulverization is for producing the adsorbent according to the present invention,
When used as so-called charcoal, there is no need to grind.

Next, the processing step B of natural zeolite will be described.

Although zeolite is also produced artificially, in the present invention, a natural substance called zeolite is used. A typical component of natural zeolite is SiO _2.
69.38 wt%, Al ₂ O ₃ .11.02 wt%, F
_{e 2 O 3 ·· 0.92wt%,} MgO ·· 0.60wt
%, CaO ·· 1.31wt%, Na 2 O ·· 3.34
_{wt%, K 2 O ·· 3.17wt} %, H 2 O ·· 10.1
For example, 3 wt%. Mineral layers of natural zeolite are multilayered, and the composition ratio of components differs depending on the layer,
A component having a preferable component composition ratio is selected, or several components are mixed and used.

The zeolite is crushed to a certain size, calcined, and further powdered is used as a material for the adsorbent described below.

The zeolite contains about 1.31% by weight of calcium in the form of CaO, and calcium is contained in the carbonized carbon in the above-mentioned carbonizing furnace. In order to further improve the performance, it is a preferred embodiment to add calcium as a simple substance. The same applies to alumina (Al ₂ O ₃ ) and phosphoric acid.

The powdered charcoal and zeolite (including added calcium, alumina and the like) obtained in the above steps are mixed by stirring, kneaded with a binder, and 4 to 5 mm in diameter and length by a molding machine. It is formed in a cylindrical shape of about 5 to 15 mm.

The mixing ratio of each component is, for example, 5
2wt%, zeolite powder 35wt%, binder 13wt
%.

Examples of the binder include sodium silicate, P
entally G (trade name), high melting point pitch, ethyl cellulose, lignin, phenol formaldehyde, sugar, dextrose, saccharose, cellulose, starch, dextrin and the like are used.

When dextrin, starch or the like is used as a binder, NH ₃ is impregnated with microorganisms.
Can be decomposed.

The molded product which has been dried to a certain extent is put into a firing machine and fired. This step is a step of evaporating water in the dextrin, and preferably is performed at a temperature at which the dextrin is carbonized, so that the pores on the surface of the charcoal and zeolite having an important function for adsorption are blocked. It is to prevent.

[0046]

【Example】

Experimental Example Using the adsorbent obtained above, ammonia (N
An experiment was conducted to confirm the adsorption performance of H ₃ ) and carbon dioxide (CO ₂ ).

EXPERIMENTAL EXAMPLE 1 Air containing ammonia at a concentration of 120 ppm / 100 ml was shielded in a closed vessel of 1 m ³ , and 5
An adsorbing device for enclosing 90 g of the adsorbent in a cylinder and forcibly ventilating with a fan was arranged, and the ammonia concentration at each elapsed time was measured by a detector tube. The temperature was set at 18 ° C. and the humidity was set at 52%. The experimental values were 19 ppm after 5 minutes, 7.5 ppm after 10 minutes, 5 ppm after 15 minutes, and 3.5 ppm after 20 minutes. Ammonia concentration 5-10pp
m, smell at 50 ppm, feel unpleasant at 50 ppm,
Since stimulation was felt at a concentration of 100 ppm, sufficient adsorption performance was recognized.

Experimental Example 2 A sealed container having a volume of 0.08 m ³ was filled with ammonia at a concentration of 10 ppm, and 700 g of the adsorbent was left in the container, and the ammonia concentration was measured for each elapsed time. Initial concentration 10 ppm, 1.5 ppm after 10 minutes,
An experimental value of 1 ppm was obtained after 20 lapses.

EXPERIMENTAL EXAMPLE 3 A sealed container having a volume of 0.08 m ³ was filled with CO ₂ at a concentration of 5200 ppm, and 920 g of the adsorbent was left in the container, and the CO ₂ concentration was measured for each elapsed time. .
The temperature was 27 ° C. and the humidity was 64%. After 5 minutes 2
500 ppm, 1600 ppm after 10 minutes, 1300 ppm after 15 minutes, 1000 ppm after 20 minutes, 2 ppm
750 ppm after 5 minutes, 600 ppm after 30 minutes,
After 35 minutes, an experimental value of 500 ppm was obtained.

Experimental Example 4 Air containing ammonia at a concentration of 100 ppm / 100 ml was shielded in a closed vessel of 1 m ³ , and 5
An adsorber for enclosing 00 g of the adsorbent in a cylinder and forcibly ventilated by a fan was arranged, and the ammonia concentration at each elapsed time was measured by a detector tube. The temperature was set to 15 ° C. and the humidity was set to 54%. The experimental values were 10 ppm after 5 minutes, 2.0 ppm after 10 minutes, and 1.0 ppm after 15 minutes.

EXPERIMENTAL EXAMPLE 5 Air containing ammonia at a concentration of 30 ppm / 100 ml was shielded in a closed vessel of 1 m ³ , and 50
An adsorption device for sealing 0 g of the adsorbent in a cylindrical body and forcibly ventilating with a fan was arranged, and the ammonia concentration at each elapsed time was measured by a detector tube. The temperature was set at 14 ° C. and the humidity was set at 46%. The experimental value was 7.0 ppm after 5 minutes and 0.0 ppm after 10 minutes.

[0052] The air containing ammonia Example 6 Concentration 60 ppm / 100 ml shielded in a closed vessel 1 m ^3, in the closed container, 50
An adsorption device for sealing 0 g of the adsorbent in a cylindrical body and forcibly ventilating with a fan was arranged, and the ammonia concentration at each elapsed time was measured by a detector tube. The temperature was set at 14 ° C. and the humidity was set at 43%. The experimental value was 6.0 ppm after 5 minutes and 0.0 ppm after 10 minutes.

Experimental Example 7 The composition of the adsorbent was changed to a carbide (87 wt.
%) And an adsorbent with 13% by weight of dextrin were prepared, and an experiment of adsorption performance was performed. The experiment was performed at a concentration of 100 ppm / 1.
The air containing 00 ml of ammonia is shielded in a 1 m ³ airtight container, and in this airtight container, an adsorber for enclosing 600 g of the adsorbent in a cylinder and forcibly ventilating with a fan is arranged, and the ammonia concentration at each elapsed time is set. Was measured by a detector tube. The ammonia concentration after 40 minutes is 48
ppm.

Experimental Example 8 An adsorbent was prepared in which the composition of the adsorbent was zeolite (87% by weight) and dextrin was 13% by weight, and the adsorption performance was tested. Experiments shields air containing ammonia concentration 100 ppm / 100 ml in a closed vessel 1 m ^3, in the sealed container, place the suction device for forced air by enclosing the adsorbent 600g the cylindrical body fan The measurement was performed by measuring the ammonia concentration at each elapsed time with a detector tube. After 40 minutes, the ammonia concentration was 32 ppm.

[0055]

According to the carbonization furnace of the present invention, it is possible to produce a carbide having excellent adsorption performance even by a so-called layman by simply following the operation manual. Agent can be obtained, and the problem described above is achieved.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a manufacturing process of an adsorbent according to the present invention.

FIG. 2 is a schematic sectional view showing one embodiment of a carbonization furnace according to the present invention.

[Explanation of symbols]

 1-Carburizing furnace main body 2-Metal basket for storing carbonized material 3-Burner 4-Hot air path 5-Temperature control butterfly valve 6-Suction turbo fan 7-Wood vinegar removal valve 8-Safety valve 9-Wood vinegar removal valve 10-End Slice valve 11-flue tube 12-lid 13-Jinkasa 14-burner control thermometer 15-thermometer 16-thermometer 17-thermometer 18-thermometer 19-anometer 20-water cooling inlet 21-water cooling overflow 22-water cooling Inlet 23-water cooling overflow

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) C01B 31/02 101 B01J 3/00 B01J 20/20 C10B 53/02 F27B 17/00

Claims (5)

(57) [Claims] 1. A carbonized material disposed in a furnace by introducing a burner flame into the furnace in a state where the gas in the furnace is sucked by an ejector disposed below a main body of the carbonizing furnace, and the gas in the furnace is guided to a flue tube. Carbonization furnace characterized by performing carbonization. 2. The carbonization furnace according to claim 1, wherein the wall, bottom and lid of the carbonization furnace are water-cooled. 3. A carbide obtained by the carbonization furnace according to claim 1 or 2, which is used as an adsorbent A having the following constitution,
Carbide that does not feel the smell of ammonia when performing. [Adsorbent A] (1) Carbide powder 52 wt%, (2) SiO ₂ ··· 69.38 wt%, Al ₂ O ₃ ··· 1
_{1.02wt%, Fe 2 O 3 ··} 0.92wt%, MgO
0.60 wt%, CaO 1.31 wt%, Na
_{2 O ·· 3.34wt%, K 2} O ·· 3.17wt%, H
Firing the obtained by crushing the ₂ O ·· _10.13wt% of natural zeolite powder, powdered and the ones 35 wt%, (3) a binder 13 wt% of the mixture, adsorbent form kneading such as sodium silicate. [Experiment A] Ammonia at a concentration of 10 ppm was sealed in a closed container having a volume of 0.08 m ³ , and 700 g of the adsorbent was left in this container. Odor is felt at a concentration of 5 to 10 ppm.) (1) 52% by weight of the pulverized carbide obtained in the carbonization furnace according to claim 1 or (2) SiO _2.
69.38 wt%, Al ₂ O ₃ .11.02 wt%, F
_{e 2 O 3 ·· 0.92wt%,} MgO ·· 0.60wt
%, CaO ·· 1.31wt%, Na 2 O ·· 3.34
_{wt%, K 2 O ·· 3.17wt} %, H 2 O ·· 10.1
An adsorbent obtained by mixing 3 wt% of natural zeolite powder with 35 wt%, kneading using 13 wt% of a binder and then molding by a molding machine, and calcining the resulting mixture, was used in Experiment A below. Adsorbent that does not feel the smell of ammonia when exposed. [Experiment A] Ammonia at a concentration of 10 ppm was sealed in a closed container having a volume of 0.08 m ³ , and 700 g of the adsorbent was left in this container. Odor is felt at a concentration of 5 to 10 ppm.) 5. The adsorbent according to claim 4, wherein calcium and / or alumina is added.