KR101070673B1 - Method for reduging ash of anthracite and fabricating method of activated carbon using anthracite manufactured by the same method - Google Patents

Abstract

A method for low ashing anthracite coal and a method for producing activated carbon using the anthracite coal produced thereby is disclosed. By selecting the anthracite coal with a sand separator and treating with phosphoric acid, the ash content can be greatly reduced. In addition, by producing activated carbon using anthracite coal containing low ash, it is possible to obtain high quality activated carbon that satisfies the specifications of activated carbon for water treatment according to the drinking water management method.

Description

METHODS FOR REDUGING ASH OF ANTHRACITE AND FABRICATING METHOD OF ACTIVATED CARBON USING ANTHRACITE MANUFACTURED BY THE SAME METHOD}

The present invention relates to a low ashing method of anthracite and an activated carbon production method using the anthracite produced thereby.

Activated carbon is widely used as a decolorant and deodorant for adsorbing organic materials and metals, and recently, it is widely used for the purpose of preventing air pollution and water pollution.

Coal is roughly divided into bituminous coal and anthracite coal.

When bituminous coal and anthracite coal are distinguished according to their degree of carbonization, those having a degree of carbonization less than 80% are called bituminous coal and those having a degree of carbonization of 80% or more are called anthracite. The bituminous coal is further classified into peat for 60% or less of carbon, bituminous coal for 60 to 70% of carbon, bituminous coal for 70 to 80% of carbon. This is called.

In addition, when the bituminous coal and anthracite coal are distinguished according to the generation of smoke, the bituminous coal generated when the fire is caught is referred to as bituminous coal, and the smokeless is called anthracite coal.

In general, the raw material of activated carbon is a bit ash and a high volatility bituminous coal is used bituminous coal or lignite, it is prepared by activating the bituminous coal or lignite as a gas after carbonization, or by chemicals.

Bituminous coal has a low ash content of 15% or less and a volatile content of 30% or more, and activated carbon produced from bituminous coal has good quality. However, because it is relatively expensive, there is an uneconomical disadvantage.

In order to manufacture economic activated carbon, activated carbon based on anthracite and a method of manufacturing the same are disclosed in Korean Patent Laid-Open Publication No. 2002-78054.

By the way, anthracite coal has a ash content of 17% or more, has a low volatile content of 3% or less, and has a low hardness of 90% or less, and is used for fuels and filter materials. Therefore, the activated carbon disclosed in Korean Patent Laid-Open No. 2002-78054 and its manufacturing method have a disadvantage in that it is difficult to manufacture high quality activated carbon.

The present invention has been made to solve the conventional problems as described above, an object of the present invention is to provide a method for low ash anthracite coal.

Another object of the present invention is to provide an activated carbon production method capable of producing high quality activated carbon using anthracite as a raw material.

Low ashing method of anthracite coal according to the present invention for achieving the above object, the step of separating the anthracite coal to a particle size of 4 x 8 Mesh or 8 x 20 Mesh particles; Selecting only the anthracite coal having a particle size of 1.5 g / cm 3 or less; 5v / v% dilute phosphoric acid: selected anthracite = 10l: 1kg, mixed with 5l phosphoric acid and 100l of water, followed by stirring at 90 ° C for about 2 hours; And dehydrating the anthracite coal treated with phosphoric acid until water is reduced by about 15%, and then drying at about 150 ° C. for about 1 to 2 hours.

In addition, the method for producing activated carbon using anthracite according to the present invention comprises the steps of: pulverizing anthracite and separating it into particle sizes of 4 x 8 Mesh or 8 x 20 Mesh particles; Selecting only the anthracite coal having a particle size of 1.5 g / cm 3 or less; 5v / v% dilute phosphoric acid: selected anthracite = 10l: 1kg, mixed with 5l phosphoric acid and 100l of water, followed by stirring at 90 ° C for about 2 hours; Dehydrating the anthracite treated with phosphoric acid until water is reduced by about 15%, and then drying at about 150 ° C. for about 1 to 2 hours; After the phosphoric acid treatment, the dehydrated and dried anthracite coal is placed in a furnace in which an inert gas is injected, and heated and carbonized at a temperature of 500 to 600 ° C. for 1 to 2 hours; KOH solution diluted to 5-15% relative to the amount of water: the anthracite carbonized at a ratio of carbonized anthracite = 1 to 4: 1 was impregnated into the KOH solution for about 3 hours, and about 5 minutes at about 30 minute intervals. Stirring; Dehydration of the anthracite coal impregnated in the KOH solution until the water content is reduced by about 15%, followed by drying at about 150 ° C. for about 1 to 2 hours, and impregnating the KOH solution, followed by dehydration and drying the anthracite coal 800 to Steam activation is performed at 1,000 ° C. for about 180 minutes.

In the present invention, by selecting the anthracite coal with a sand separator and treating with phosphoric acid, the ash content can be greatly reduced. In addition, by producing activated carbon using anthracite coal containing low ash, it is possible to obtain high quality activated carbon that satisfies the specifications of activated carbon for water treatment according to the drinking water management method.

Hereinafter, a low ashing method of anthracite coal and an activated carbon production method using the anthracite coal prepared according to an embodiment of the present invention with reference to the accompanying drawings.

1 is a view showing a low ashing process of anthracite coal and a manufacturing process of activated carbon according to an embodiment of the present invention.

As shown, the activated carbon according to the present embodiment uses anthracite having a carbonization degree of 80% or more as a raw material. By the way, anthracite coal contains about 17 to 40% of ash.

The amount of ash in anthracite Total ash content ratio (%) 17.15 ingredient SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ CaO MgO Etc Content ratio (%) 47.65 39.45 4.57 0.56 0.92 6.85

As a result of analyzing the content ratio of ash contained in the anthracite coal collected in Jangseong-gun, Jeollanam-do, the total content ratio of ash was 17.15%. Specific components constituting the ash are SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ , CaO, MgO and other inorganic components including NaO.

In this case, based on the total ash content, 47.65% of SiO ₂ , 39.45% of Al ₂ O ₃ , 4.57% of Fe ₂ O ₃ , 0.56% of CaO, 0.92% of MgO and 6.85 of other inorganic components including NaO. %.

The inorganic components constituting the ashes are bad because they adversely affect the adsorption performance of the activated carbon and the function of the catalyst.

First, the low ashing method of anthracite coal is demonstrated.

Grinding and Separation Step (S10)

In the low ashing method of anthracite according to this embodiment, in order to reduce the content of ash contained in the anthracite, first, the anthracite is pulverized and only anthracite having a predetermined particle size is separated (S10).

The amount of ash contained in the anthracite coal after particle size separation Mesh 4 x 8 8 x 20 20 x 80 80 x 200 200 x 325 Ash content ratio (%) 12.3 13.4 17.1 19.1 21.3

As shown in Table 2, when the anthracite coal was pulverized and separated in the Jangseong-gun, Jeollanam-do, the smaller the particle size, the higher the ash content, and the larger the particle size, the lower the ash content. For this reason, in this embodiment, anthracite coal having particle sizes of 4 x 8 Mesh and 8 x 20 Mesh is used. 4 x 8 mesh anthracite contains approximately 12.3% ash, and 8 x 20 mesh anthracite contains approximately 13.4% ash.

Another reason for using anthracite with particle size of 4 x 8Mesh and 8 x 20Mesh is that the size of particles larger than 4 x 8Mesh is so large that it is difficult to inject carbonized anthracite into the inside of the activator during the activation process. In the case of particles smaller than 8 x 20 mesh, the anthracite and carbonized anthracite are almost burned out in the carbonization and activation process, which will be described later.

Ash is also contained in anthracite coals with particle sizes larger than 8 x 20 Mesh.

Sorting step by sand separator (S20)

Next, in order to further reduce the amount of ash contained in the particle size separated anthracite coal, the anthracite coal is reselected by a sand separator (S20). Sand separator screening is a physical screening method that separates low ash anthracite and high ash anthracite by density difference.

Since the anthracite has a different density depending on the amount of ash contained in the anthracite, anthracite having a density of approximately 1.5 g / cm 3 or less is selected.

The amount of ash contained in the anthracite coal after sand separator screening division Content ratio before screening (%) Content ratio after screening (%) % Reduction 4 x 8 Mesh 12.3 4.2 65.8 8 x 20 Mesh 13.4 5.1 61.9 Average 12.85 4.65 63.9

As shown in Table 3, the anthracite coal having a particle size of about 4 x 8Mesh contained about 12.3% of ash, while the anthracite coal selected by a sand separator at a density of 1.5 g / cm 3 or less contained about 4.2% of ash. Anthracite coal having a particle size of about 8 x 20Mesh contained about 13.4% of ash, while anthracite coal sorted to a density of 1.5 g / cm 3 or less by a sand separator contained about 5.1% of ash. Therefore, the amount of ash contained in the anthracite coal selected by the sand separator decreased by 65.8% and 61.9%, respectively, by 63.9% on average compared to before the selection.

Phosphate treatment step (S30)

Next, in order to further reduce the ash contained in the anthracite coal selected by the sand separator, the anthracite coal is treated with phosphoric acid (S30). When anthracite coal is treated with phosphoric acid, the ash contained in the anthracite coal is reduced because ash is eluted by dissolution of phosphoric acid.

In this embodiment, anthracite coal is impregnated with 5v / v% dilute phosphoric acid in which 5l of phosphoric acid is mixed with 100l of water. At this time, the mixture of dilute phosphoric acid: anthracite coal = 10L: 1kg and stirred at 90 ℃ for about 2 hours. The metal material in the ash contained in the anthracite coal is then eluted.

Phosphorus contained in phosphoric acid is a substance that makes up bones of animals. It is used to harden ceramics when baking them. Therefore, when the anthracite coal is treated with phosphoric acid, when the carbonization (S50) process and the activation process (S80) described later are completed, phosphorus remains in the activated carbon, thereby increasing the hardness of the activated carbon. This will be described later.

Dehydration and drying step (S40)

Next, the anthracite treated with phosphoric acid is dehydrated and dried (S40).

Dehydration is performed using a general dehydrator, and about 10 minutes of dehydration reduces water by about 15%. And drying is dried for about 1 to 2 hours on 150 degreeC conditions. Anthracite coal is then produced with reduced ash.

The amount of ash contained in dehydrated and dried anthracite after phosphate treatment division Before phosphate treatment After phosphate treatment Reduction rate Ash content ratio (%) 4.65 4.20 9.7

The quantity of ash contained in the anthracite coal after sand separator sorting was 4.65% on average as shown in Table 3 and Table 4. In other words, the amount of ash contained in the anthracite coal before the phosphoric acid treatment was on average 4.65%. However, as shown in Table 4, the amount of ash contained in the anthracite coal after phosphoric acid treatment was reduced by about 9.7% to 4.20%.

As shown in Table 4, the amount of ash contained in the anthracite treated with phosphoric acid was 4.20%. As shown in Table 5, the amount of ash contained in the Australian lignite system generally used as a raw material of activated carbon is 3.9%, and the amount of ash contained in the US bituminous coal is 8.1%.

The amount of ash in the bituminous coal division Australian lignite US Bituminous Coal Ash content ratio (%) 3.9 8.1

Accordingly, the amount of ash contained in the anthracite treated with phosphoric acid after the particle size was separated and sorted with the sand separator was about 4.2%, which was almost similar to or less than the amount of ash contained in the bituminous coal.

Therefore, it can be seen that the anthracite coal according to the present embodiment may be used as a raw material of activated carbon since the ash content is low.

Next, a method of producing activated carbon using the anthracite coal prepared by the above method will be described.

Activated carbon is prepared by carbonization (S50) → impregnation in KOH solution (S60) → dehydration and drying (S70) → steam activation (S80).

Carbonization Step (S50)

In the carbonization (S50) process, the anthracite coal is placed in a furnace in which an inert gas such as argon gas or nitrogen gas is injected and heated at a temperature of 500 to 600 ° C. for 1 to 2 hours.

It is very important to set a suitable carbonization temperature because the pore structure, which greatly affects the adsorption characteristics of activated carbon, changes with the carbonization temperature. In this embodiment, under the same conditions, the carbonization time was continued up to 300 minutes after raising the temperature to 500 ° C to 600 ° C carbonization temperature at a temperature increase rate of 5 ° C / min at room temperature. Within 120 minutes of the carbonization time, the volatile content contained in the anthracite coal is lowered to 1% or less, and from the time after 120 minutes, the change in the volatile reduction rate with the increase of the carbonization time is insignificant, and the carbonization time is performed for 60 to 120 minutes.

Then, the specific surface area of the anthracite coal becomes large.

Immersion step in KOH solution (S60)

Next, the carbonized anthracite coal is impregnated with KOH solution for about 3 hours. At this time, the mixture is stirred for about 5 minutes at 30 minute intervals.

Anthracite coal has low reactivity due to its graphite-like structure, making it difficult to produce pores and expand pores in carbonization and steam activation processes, compared to other raw materials. As a result, when producing activated carbon from anthracite coal, there is a limit in obtaining activated carbon having a high specific surface area.

When producing activated carbon from anthracite, anhydrous coal is impregnated into the KOH solution to obtain a high specific surface area. KOH solution is prepared by diluting to 5-15% with respect to the amount of water. The amount of the KOH solution may be sufficient to sufficiently fill the pores of the anthracite coal, and if excessive, the walls of the anthracite pores will be destroyed.

When the weight ratio of carbonized anthracite to KOH solution was changed from 1: 1 to 1: 5, the water vapor activation process described below was performed. When the weight ratio was small, fine pores were developed in the anthracite coal. Develop. That is, when the weight ratio is 1: 5 or more, large pores are formed in the carbonized anthracite coal, so that the specific surface area is reduced to the maximum. Therefore, the amount of KOH solution is preferably 1 to 4 times that of carbonized anthracite.

When the anthracite coal is impregnated into the KOH solution, the specific surface area of the anthracite coal becomes very large in the activation process described later. The reason why the anthracite coal is impregnated into the KOH solution will be explained.

The theoretical distance between graphite layers is C _1/2 = 3.354Å, and the hot-Quenching technique swells the graphite layer distance more than twice and impregnates the KOH solution to help the insertion of K ⁺ metal ions between the graphite layers.

When the alkali-metal is deposited on the graphite layer, electrons are first donated to carbon by the strong electron donating function of the alkali-metals, and electrons are then donated to the metals, so that the metals are in an electron excess state. As can be seen from Table 6 and FIG. 2, the increase in the electron density by carbon deposition by alkali-metal deposition significantly increases the spin concentration of carbon even by adding a small amount of alkali-metal to carbon.

Spin Concentration of Carbon According to Inputs by Alkali-metal Type NaOH addition amount
(mmol / g) Spin number
(x 1017) KOH addition amount
(mmol / g) Spin number
(x 1017) 0 0 0 0 One 0.1 1.0 0.2 2 0.25 2.0 0.5 3 0.5 3.2 One 4 1.1 3.8 2 5 1.8 4.2 5 8 4 4.6 3 11 6 5.0 0.4 5.2 0.2 5.6 0.3 12.0 0.7 16.0 0.8

In other words, when the carbonized anthracite coal is impregnated with alkali-metal, high specific surface area of the activated carbon during the carbonization process and the activation process described later becomes possible. This is because the specific carrier action is caused by the cooperative action of the microdispersion of the supported metal and the electron conduction action due to the large internal surface area of the activated carbon. In other words, when carbonized anthracite coal is impregnated into the KOH solution, high specific surface area of the activated carbon becomes possible. This shows that K metal has a more pronounced effect than Na.

Dehydration and drying step (S70)

The anthracite coals impregnated in the KOH solution are dehydrated with a general dehydrator for about 10 minutes, reducing water by about 15%.

And drying is dried for about 1 to 2 hours in 150 degreeC atmosphere. The moisture is then reduced to 1% or less.

Water vapor activation step (S80)

Steam activation process (S80) is a process of dehydrating and oxidizing carbonized anthracite coal with KOH solution to make porous adsorbable activated carbon, storing carbonized anthracite charcoal treated with KOH solution in the furnace, and high temperature steam into the furnace. By injecting an oxidizing gas such as, CO ₂ or oxygen, and reacting with carbonized anthracite coal, to make a fine porous activated carbon.

In the gas activation process, as the microstructured portion of the carbon body is selectively decomposed and consumed during the heating process, the microscopic gaps between the carbon crystals are opened to rapidly increase the internal surface area. Then, the crystalline body constituting the carbon body or the carbon body constituting the fine pore portion is consumed to form a complex structure with medium to macropores depending on the carbon structure.

The process of formation of these pores is directly related to carbon consumption. When the carbon off rate of the raw material is 50% or less, the micropore of 20 μm or less becomes the main activated carbon, and the carbon reaction rate of the raw material. When this amount exceeds 75%, large pore size (= Macropore) of 500 mm 3 or more increases. Then, when the carbon reaction consumption (Burn off) of the raw material is 50 to 75%, a pore distribution in which 20 to 500 mu m of mesopores (= Mesopore) is mixed is formed. Therefore, it is desirable to form a lot of micropores.

The steam activation reaction is a water gas reaction and an endothermic reaction. The reaction proceeds above 750 ° C. At this time, the reaction rate of the impurities or ash contained in the carbon body is delayed depending on the catalytic action or pore state.

When the KOH solution uses four times the amount of anthracite coal and changes the activation temperature, the specific surface area is low at the activation temperature around 400 ° C, but very high specific surface area is obtained at the activation temperature of 600 to 800 ° C.

The relationship between the pore radius, cumulative pore volume and pore distribution of activated carbon by specific surface area analysis shows that the activated carbon impregnated with KOH solution has a similar number of pores with a radius of 10 Å compared to the activated carbon not impregnated with KOH solution. There are a lot of pores in the vicinity of a radius of 10 to 20 microseconds. Therefore, when the anthracite coal is impregnated into the KOH solution, the micropores are greatly developed.

The mechanism by which the KOH solution (melting point 360 ° C.) works in the steam activation process is explained.

First, when the temperature in the furnace is 400 ℃ dehydration occurs first as shown in the formula (1),

2KOH → K ₂ O + H ₂ O (dehydration) (1)

The dehydration strongly erodes the carbon at the firing temperature of 500 ℃ or more as shown in the formula (2) and (3),

C + H ₂ O → H ₂ + CO (Water gas reaction) (2)

CO + H ₂ O → H ₂ + CO ₂ (Water gas shift reaction) (3)

While releasing CO and CO ₂ , it produces a complexly developed porous carbon.

When the activation temperature exceeds 700 ° C., K ₂ O generated in formula (1) is reduced by H ₂ and C as in formulas (4) and (5).

K ₂ O + H ₂ → 2K + H ₂ O (Reduction by H ₂ ) (4)

K ₂ O + C → 2K + CO (Reduction by C) (5)

It produces metal potassium (Kalium), which is inserted into the carbon matrix because it is mobile at the activation temperature. As a result, several atomic layers of carbon swell to form pores.

Activated carbon produced by steam activation has high adsorption performance with high specific surface area.

The most suitable temperature range for steam activation is 800 to 1,000 ° C. The carbonized anthracite coal was carbonized at 500 ° C. for 60 minutes, and then activated for 180 minutes while varying the activation temperature from 800 ° C. to 1,000 ° C. in order to find the optimum activation temperature. At this time, the input amount of water vapor was constantly supplied by four times the theoretical reaction amount with carbon.

Characteristics of Activated Carbon with Activation Temperature of KOH Treated Carbonized Anthracite Sample number Activation temperature
(℃) Activation time
(min) Specific surface area
(㎡ / g) I2 adsorption
(mg / g) One 800 180 1,065 954 2 850 180 1,122 1,020 3 900 180 1,207 1,088 4 950 180 1,262 1,123 5 1,000 180 924 825

As shown in Table 7, the correlated specific surface area (m 2 / g) and I ₂ adsorptive force (mg / g) gradually increased until the activation temperature reached 950 ° C., but sharply decreased above that. Therefore, the optimum activation temperature based on the specific surface area (m 2 / g) and the I ₂ adsorption force (mg / g) is around 950 ° C, and the yield at that time is about 30%.

Above 950 ° C, the reaction between carbonized anthracite and water vapor occurs rapidly, and the reaction occurs mainly on the surface rather than the formation of pores in the carbonized anthracite coal, and the yield and I ₂ adsorption force (mg / g) are estimated to decrease.

In order to examine the relationship between the activation time and the adsorption characteristic, in this embodiment, the activation time was changed from 120 minutes to 240 minutes at an activation temperature of 950 ° C. to activate the carbonized anthracite coal. At this time, the input amount of water vapor was constantly supplied by four times the theoretical reaction amount with carbon.

Characteristics of Activated Carbon with Activation Time of KOH Treated Carbonized Anthracite Sample number Activation temperature
(℃) Activation time
(min) Specific surface area
(㎡ / g) I2 adsorption
(mg / g) One 950 120 1,013 903 2 950 150 1,136 1,021 3 950 180 1,262 1,123 4 950 210 1,225 1,102 5 950 240 1,044 942

As shown in Table 8, the specific surface area (m 2 / g) and I ₂ adsorption force (mg / g) increased up to 180 minutes, but thereafter decreased again. And when the activation time was 180 minutes or more, the yield decreased to 30% or less.

It is estimated that the carbonized anthracite coal is reduced to water gas, so that the amount of ash is relatively increased, thereby reducing the I ₂ adsorption force (mg / g).

Thus, the optimal activation time is 180 minutes.

As described above, the activated carbon produced by the production method according to the present embodiment using anthracite coal has a very high I ₂ adsorption force (mg / g).

Anthracite is phosphated and carbonized at about 500 to 600 ° C., leaving phosphorus in carbon to increase hardness. When the carbonization conditions (1 hour at 500 ° C) and the activation conditions (850 ° C, 180 minutes, and the amount of water vapor supplied at 4 times the theoretical reaction amount with carbon) are the same, the hardness of the activated carbon without phosphorication is Although it was only 89% when measured according to the KS test method, the hardness of the activated carbon treated with phosphoric acid increased by 6% to 95% when measured according to the KS test method.

When the carbonization conditions (1 hour at 500 ° C.), the activation conditions (850 ° C., 180 minutes, and the amount of steam input are supplied by 4 times the theoretical reaction with carbon) and the phosphoric acid treatment conditions are the same, KOH treatment The iodine adsorption capacity of activated carbon and KOH-treated activated carbon was 710 mg / g and 1,020 mg / g, respectively, and the iodine adsorption capacity of KOH-treated activated carbon was increased by 310 mg / g.

The specification of activated carbon for water treatment agents according to the Drinking Water Management Act (No. 187 2002.12.9) and the characteristics of activated carbon produced by the manufacturing process according to the present embodiment will be described.

The powdered activated carbon according to the present embodiment is activated carbon prepared using 8 x 20 Mesh anthracite coal, and the granular activated carbon is activated carbon prepared using 4 x 8 Mesh anthracite coal.

Specification of Activated Carbon for Water Treatment Agents according to the Drinking Water Management Act and Characteristics of Activated Carbon According to the Example
division Powdered activated carbon Granular activated carbon Standard activated carbon According to this embodiment
Activated carbon Standard activated carbon According to this embodiment
Activated carbon Appearance Black powder Same as left Black grain Same as left Test Suitable Same as left Suitable Same as left pH 4.0 to 11.0 8.2 4.0 to 11.0 8.2 Sieve residue 200Mesh (74㎛)
Sieve residue 10% or less 3.2% Pass 8Mesh (2,380㎛)
And at 35Mesh (500㎛)
Remaining sieve residue
95% or more
98.3% Dry weight loss 50% or less 4.3% 5% or less 3.8% chloride 0.5% or less 0.003% 0.5% or less 0.003% arsenic 2 ppm or less 0.05ppm 2 ppm or less 0.05ppm lead 10ppm or less Not detected 10ppm or less Not detected cadmium 1ppm or less Not detected 1ppm or less Not detected zinc 50 ppm or less 0.02ppm 50ppm or less 0.02ppm Phenolic Sodium 25 or less 21 25 or less 21  ABS 價 50 or less 24 50 or less 24 Methylene blue
Decolorization More than 150ml / g 210ml / g More than 150ml / g 210ml / g iodine
Adsorption 950 ml / g or more 1,020ml / g 950 ml / g or more 1,020ml / g

As shown in Table 9, the activated carbon prepared by the manufacturing method according to the present embodiment satisfies all the specifications of the activated carbon for the water treatment agent, it can be seen that the high-quality activated carbon that can be used for tap water purification.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Of course.

1 is a view showing a low ashing process of anthracite coal and a manufacturing process of activated carbon according to an embodiment of the present invention.

Figure 2 shows the spin concentration of activated carbon according to the alkali-metal dosage.

Claims (2)

Milling the anthracite to separate it into particle sizes of 4 x 8 Mesh or 8 x 20 Mesh particles; Selecting only the anthracite coal having a particle size of 1.5 g / cm 3 or less; 5v / v% dilute phosphoric acid: selected anthracite = 10l: 1kg mixed with 5l of phosphoric acid, and stirred at 90 ° C for 2 hours; And After dehydrating the anthracite coal treated with phosphoric acid until the water content is reduced by 15%, drying is performed at 150 ° C. for 1 to 2 hours. Milling the anthracite to separate it into particle sizes of 4 x 8 Mesh or 8 x 20 Mesh particles; Selecting only the anthracite coal having a particle size of 1.5 g / cm 3 or less; 5v / v% dilute phosphoric acid: selected anthracite = 10l: 1kg mixed with 5l of phosphoric acid, and stirred at 90 ° C for 2 hours; Dehydrate the anthracite coal treated with phosphoric acid until the water content is reduced by 15%, and then dry at 150 ° C. for 1 to 2 hours; After the phosphoric acid treatment, the dehydrated and dried anthracite coal is placed in a furnace in which an inert gas is injected, and heated and carbonized at a temperature of 500 to 600 ° C. for 1 to 2 hours; KOH solution diluted to 5-15% relative to the amount of water: the anthracite carbonized at a ratio of carbonized anthracite = 1 to 4: 1 impregnated with KOH solution for 3 hours, and stirred for 5 minutes at 30 minute intervals ; Dehydrating the anthracite coal impregnated with KOH solution until the water content is reduced by 15%, and then drying at 150 ° C. for 1 to 2 hours, and After impregnating the KOH solution, the dehydrated and dried the anthracite coal activated carbon for 800 minutes at 800 ~ 1,000 ℃ characterized in that for performing the step of activated carbon using anthracite.

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