KR102120374B1 - Extracting apparatus of humic substance and extracting method of humic substance using the same - Google Patents

Abstract

The present invention relates to a device capable of efficiently extracting corrosive substances including humic acid and fulvic acid without using harmful chemical substances using electrolysis water, and a method for extracting corrosive substances using the same.

Description

Corrosive substance extraction device and method for extracting corrosive substances using the same {Extracting apparatus of humic substance and extracting method of humic substance using the same}

The present invention relates to a device for extracting corrosive substances. More specifically, the present invention relates to an apparatus capable of efficiently extracting corrosive substances including humic acid and fulvic acid without using harmful chemical substances using electrolysis water, and a method for extracting corrosive substances using the same.

A humic substance is an organic polymer complex, and is made of humic acid, fulvic acid, and humic coal. At this time, humic acid is an organic substance that solidifies when acidifying a corrosive substance extracted with a strong base, and fulvic acid is an organic acid that maintains solubility when the strong base extract is oxidized. An organic material that does not dissolve in the remaining acid-bases is humus.

Humic acid has a hydrophilic group and an organic group in the molecule, allowing moisture to easily flow in and out of the soil, and has good cohesiveness to create an environment where microorganisms can inhabit. This plays a very important role in the maintenance of soil fertility and soil environmental stability, such as physically and chemically improving the soil beneficially for crop growth or increasing the organic content to activate soil microorganisms. In addition, humic acid is used as a plant growth accelerator, a trace element carrier, and a chelating agent.

Fulvic acid is similar to humic acid, but differs in carbon and oxygen content, acidity, polymerization degree, molecular weight and color. Fulvic acid has high solubility even in strong acids and is generally represented by the formula C ₁₃₅ H ₁₈₂ O ₉₅ N ₅ S ₂ . It consists of a combination of aromatic organic polymers with many carboxyl groups (COOH) that release hydrogen ions. In addition, it forms strong complexes with metal ions, especially Fe ³⁺ , Al ³⁺ and Cu ^2+, and increases their solubility in natural waters, contributing to plant root growth.

These humic acids and fulvic acids are separated from coals such as lignite, and have been extracted with acid and alkali solutions. However, this method uses an excessive amount of alkali solution or strong acid, which is harmful to the environment or the human body, and has a problem in that the process efficiency decreases.

Therefore, it is necessary to research and develop a method for extracting soluble corrosive substances with improved process efficiency without using chemicals.

The inventors of the present invention recognize that the use of chemical substances harmful to the environment or the human body was essential in the process of extracting soluble humic substances containing humic acids from conventional coals, and are efficiently soluble without using these harmful chemical substances. While conducting research on an environmentally friendly extraction device capable of extracting corrosive substances and an extraction method using such an extraction device, by using electrolytic water of alkaline water according to electrolysis, an environmentally friendly method without using harmful chemicals, The present invention has been completed by providing an apparatus capable of extracting soluble corrosive substances from coal, or an apparatus capable of extracting fulvic acid in an environmentally friendly manner by using acidic water, and an electrolysis extraction method using the apparatus. .

Korean Registered Patent No. 10-1608410 (2016.03.28)

An object of the present invention is to provide an extraction device capable of extracting a soluble corrosive substance without using a chemical substance.

In addition, an object of the present invention is to provide an extraction method capable of maximizing the extraction efficiency of soluble corrosive substances.

In order to achieve the above object, an aspect of the present invention

An electrolytic bath comprising a cathode tank, an anode tank and a separator,

A powdered coal slurry stirring tank including a first stirring tank and a second stirring tank connected to the cathode tank and the anode tank, respectively.

A circulation line for supplying the filtrate from which the fine coals obtained from the fine powder coal slurry of the first and second stirring tanks are removed to each of the cathode and anode tanks, and

Control unit for controlling voltage and temperature in the electrolysis tank

It relates to an electrolysis extraction apparatus comprising a.

The electrolysis extraction apparatus according to an embodiment of the present invention is connected to the first stirring tank and the second stirring tank to recover the filtrate when the pH concentration of the filtrate from which the fine coal is removed satisfies a set range. It may include.

In the electrolysis extraction apparatus according to an embodiment of the present invention, the stirring tank may include a filter for separating the solid phase.

In addition, another aspect of the present invention uses the electrolytic extraction device described above,

An electrolysis step in which the filtrate from which each fine coal is removed in the first stirring tank and the second stirring tank for stirring the fine powder coal slurry is introduced into each of the cathode and anode tanks of the electrolysis tank and then electrolyzed;

An electrolytic water supply step of introducing the electrolyzed solution into the first and second stirring tanks connected to the cathode and anode tanks, respectively;

A circulating step in which the filtrate in the first stirring tank and the second stirring tank supplied with the electrolytic water is introduced into the cathode tank and the anode tank of the electrolysis tank again, and

Recovery step of recovering the filtrate after the filtrate in the first stirring tank and the second stirring tank is stabilized to a preset pH range

It relates to an electrolysis extraction method comprising a.

In the electrolysis extraction method according to an embodiment of the present invention, the fine powder coal slurry may include fine powder coal pulverized to a size of 0.1 to 200 μm.

In the electrolysis extraction method according to an embodiment of the present invention, the circulation step is repeatedly performed until the pH of the filtrate in the first stirring vessel is 9 or higher and the pH of the filtrate in the second stirring vessel is 3 or lower. It can be.

In the electrolysis extraction method according to an embodiment of the present invention, in the recovery step, when the pH of the filtrate in the first stirring vessel is 9 or higher, and the pH of the filtrate in the second stirring vessel is 3 or lower, each filtrate is removed. It may be to recover.

In the electrolytic extraction method according to an embodiment of the present invention, stirring the coal slurry may include ultrasonic treatment or high-speed stirring.

The present invention does not use harmful chemicals in the process of extracting soluble humic acid and fulvic acid containing humic acid and fulvic acid, and has the advantage of being environmentally friendly because it uses electrolysis water of water.

In addition, it has the advantage of significantly improving the extraction process efficiency of soluble corrosive substances or fulvic acids through a combination of electrolysis and circulation processes using an electrolysis tank.

1 schematically shows an electrolysis extraction apparatus according to an embodiment of the present invention.
2 is a flow chart showing the process of the electrolysis extraction method according to an embodiment of the present invention.
Figure 3 shows the soluble corrosion material extraction rate according to the Examples and Comparative Examples.

Hereinafter, the electrolysis extraction apparatus and the electrolysis extraction method using the same will be described in detail. The present invention can be better understood by the following examples. The following examples are for illustrative purposes of the present invention and are not intended to limit the scope of protection defined by the appended claims. At this time, the technical terms and scientific terms used have a meaning that is generally understood by those of ordinary skill in the technical field to which this invention belongs, unless otherwise defined.

The terminology used in the description of the present invention is only to effectively describe a specific embodiment. In addition, the singular form used in the specification and the appended claims may be intended to include the plural form unless otherwise indicated in the context.

Electrolysis extraction apparatus according to the present invention,

An electrolysis tank that performs electrolysis, including a cathode tank, an anode tank, and a separator,

A stirring tank including a first stirring tank and a second stirring tank connected to the cathode tank and the anode tank, respectively, and stirring the fine coal slurry containing fine coal in an aqueous solution,

A circulation line for supplying the filtrate, which is obtained from the finely divided coal slurry of the first stirring tank and the second stirring tank, and the fine coal is removed to separate the solid phase, to the cathode and anode tanks, and

Control unit for controlling voltage and temperature in the electrolysis tank

It includes.

At this time, the electrolysis extraction device may be for the production of humic acid.

The electrolysis extraction apparatus according to an aspect of the present invention, as shown in Figure 1, the electrolysis tank 10 including a cathode tank and an anode tank, the first stirring tank and the second stirring tank respectively connected to the cathode tank and the anode tank Stirring tank (20) comprising, a first tank and a second recovery tank for recovering the desired extraction liquid from the second stirring tank 30 and the electrolysis tank voltage and It includes a control unit 40 for controlling the temperature. At this time, the electrolysis tank including the cathode tank and the anode tank is provided with a circulation line for circulating the filtrate from which the pulverized coal obtained from the first and second stirring tanks and the pulverized coal slurry are respectively connected.

In the present invention, the filtrate is generated while stirring the fine coal slurry, which is an aqueous solution containing fine coal in the stirring tank, and the solid phase is separated by a filter provided in the stirring tank to mean a liquid phase in which fine coal is removed.

The pulverized coal slurry is an aqueous solution containing coal particles, and the water used may be tap water, mineral water, etc. containing a small amount of minerals, which has advantageous properties for performing an electrolyte and is effective in terms of performing electrolysis. However, it is not necessarily limited thereto.

According to an aspect of the present invention, the electrolysis tank may be used without limitation as long as it is a conventional one capable of electrolysis of water. Specifically, the electrolysis tank is composed of a cathode tank and an anode tank, and the cathode tank and the anode tank are separated and communicated through a separator. In this case, the separation membrane may be an ion exchange membrane or an electrolyte membrane, but is not limited thereto.

The electrolysis tank includes a cathode and an anode in the cathode tank and the anode tank, respectively, and includes an electrode device capable of voltage control. The electrode has advantageous properties in that it is possible to have a large area when possible to increase the electrolysis efficiency. In one embodiment, an electrode plated with a metal such as titanium, platinum, gold, or silver may be used, but is not limited thereto.

The voltage of the electrode device is not particularly limited, but may be 1 to 300 V, specifically 5 to 200 V, and more specifically 10 to 100 V. In the above range, process stability can be secured, water electrolysis reaction can be carried out smoothly, and it is effective in terms of increasing the production efficiency of acidic and alkaline water, but this is only a non-limiting example and is not limited by the numerical range. .

The cathode tank and the anode tank are connected to a stirring tank including a first stirring tank and a second stirring tank, respectively. The stirring tank is a device for stirring an aqueous solution containing finely divided coal slurry. The aqueous solution containing the pulverized coal slurry elutes metal ions contained in coal into the aqueous phase through stirring, and the filtrate obtained therefrom includes the metal ions.

The stirring tank includes a first stirring tank and a second stirring tank which are respectively connected to the cathode tank and the anode tank of the electrolytic tank. The first stirring tank and the second stirring tank are respectively stirred in an aqueous solution containing a fine coal slurry, and a circulation line for supplying the filtrate from which the fine coal obtained by the filter is removed from the fine coal slurry to the cathode tank and the anode tank, respectively. It is provided connected.

At this time, the stirring tank is provided with a filter for separating the solid material. The filter is used without limitation as long as it can filter solid materials according to the particle size of the coal used.

When the filtrate is supplied to the cathode and anode tanks by the circulation line, respectively, a voltage is applied in the cathode and anode tanks, and an electrolysis process is performed while flowing current. The electrolysis tank is connected to a control unit to control the voltage and temperature during the electrolysis process.

Another aspect of the present invention is to use the electrolytic extraction device described above,

An electrolysis step in which the filtrate from which each fine coal is removed in the first stirring tank and the second stirring tank for stirring the fine powder coal slurry is introduced into each of the cathode and anode tanks of the electrolysis tank and then electrolyzed;

An electrolytic water supply step of introducing the electrolyzed solution into the first and second stirring tanks connected to the cathode and anode tanks, respectively;

A circulating step in which the filtrate in the first stirring tank and the second stirring tank supplied with the electrolytic water is introduced into the cathode tank and the anode tank of the electrolysis tank again, and

Recovery step of recovering the filtrate after the filtrate in the first stirring tank and the second stirring tank is stabilized to a preset pH range

It relates to an electrolysis extraction method comprising a.

That is, as shown in Figure 2, the electrolysis extraction method according to an aspect of the present invention includes an electrolysis step (S100), an electrolytic water supply step (S200), a circulation step (S300) and a recovery step (S400). At this time, the electrolytic water supply step (S200) and the circulation step (S300) may be repeated until the electrolytic water has a desired pH range or extraction of soluble humic substances or fulvic acid is completed.

In the present invention, the “soluble corrosive substance” may contain humic acid and fulvic acid that are dissolved in alkaline water from coal. The soluble corrosive material includes fulvic acid, but is distinguished from fulvic acid, an organic acid that maintains solubility when the strong base extract is oxidized.

According to an aspect of the present invention, the type of the coal is not particularly limited, but may be any one or more selected from trade coal, lignite, lignite, bituminous coal, hot coal, peat, peat and bituminous coal. More specifically, lignite or the like may be used, but is not limited thereto.

The coal has a lower carbon content and a higher oxygen content. Specifically, it is preferable to use a carbon and oxygen ratio (C/O) of 2.0 or less, but is not limited thereto.

The coal may be fine powder having an average particle diameter of 1 to 200 μm, specifically 5 to 150 μm, and more specifically 10 to 100 μm. It has a high surface area in the above range, and is effective in terms of improving the purity and yield of soluble corrosive substances, but this is only a non-limiting example and is not limited to the above numerical range.

The pulverized coal may be dried after being subjected to a crushing process using a conventional grinder. Drying may be performed at 30 to 120° C. for 1 to 60 minutes, but is not limited thereto.

The pulverized coal may be further subjected to sonication after grinding. The ultrasonic treatment conditions are not particularly limited, but may be carried out, for example, for 0.5 to 60 minutes at 30k to 150kHz. This is effective in terms of further improving the micronization and uniformity of the pulverized coal particles.

The pulverized coal is stirred with the pulverized coal slurry mixed with water in the first stirring tank and the second stirring tank. At this time, the pulverized coal slurry is viscous and agglomerated by the substance eluted from the pulverized coal upon mixing with water. When agitation proceeds from the pulverized coal slurry, a liquid phase separated from solid coal particles is obtained. Specifically, the liquid phase obtained may be separated from the solid phase by a filter provided inside the stirring tank.

The agitation is carried out by a conventional method, and the conditions are also not particularly limited. As an example, agitation may be performed by a method of circulating water using a water pump, and may be preferably performed using a blender, but is not limited thereto.

The filtrate contains ions eluted from coal, which serves as an electrolyte in the electrolysis process.

The first stirring tank and the second stirring tank perform a pulverizing coal slurry stirring process using a conventional stirrer. The stirring process may include ultrasonic treatment or high-speed stirring. At this time, the ultrasonic treatment uses a sonicator (sonicator), high-speed agitation may use a homogenizer (homogenizer) and the like, but is not limited thereto. It is easy to elute ions from coal, and is more effective in terms of increasing the efficiency of the electrolysis process.

The filtrate obtained in the first stirring tank and the second stirring tank is supplied to the cathode tank and the anode tank of the electrolysis tank, respectively. The electrolysis tank may be filled with water, but filling with the filtrate supplied from the stirring tank is effective in terms of increasing process efficiency.

When the filtrate is filled in the cathode tank and the anode tank, an electrolysis process of water in the electrolysis tank is performed by applying a voltage by a control unit.

The hydrogen ion (H ⁺⁾ that are generated from the decomposition of water in the cathode tank, depending on the electrolysis process, the anode tank hydroxide ions (OH ^-) are generated. This changes the pH of each of the cathode and anode tanks. Accordingly, as the electrolysis process proceeds, the pH is increased in the cathode tank and the pH is decreased in the anode tank.

The application of voltage during electrolysis is not particularly limited, but may be 1 to 300 V, specifically 5 to 200 V. In addition, the temperature at the time of electrolysis is not significantly limited, but may be 0 to 90°C, specifically 30 to 60°C. Electrolysis is performed smoothly in the above range, and it is effective in terms of easy adjustment of the pH range, but this is only a non-limiting example and is not limited to the above numerical range.

The pH of the filtrate supplied to the stirring tank rises in the cathode tank and decreases in the anode tank. The filtrate in the cathode tank and the anode tank is introduced into the first stirring tank and the second stirring tank again until a predetermined pH value, specifically, a range effective for extracting humic acid or extracting fulvic acid is satisfied. At this time, the pH range of the filtrate may be 9 or higher in the first stirring tank, specifically 10.0 to 12.0, 3 or lower in the second stirring tank, and specifically 1.0 to 2.5. This is effective for the extraction reaction under alkaline and acidic conditions in each stirring tank, but this is only a non-limiting example and is not limited by the numerical range. Then, stirring is performed in the stirring tank. At this time, the incoming filtrate has a pH different from the pH range when the aqueous solution containing the finely divided coal slurry is initially stirred to accelerate the elution of soluble humic substances or fulvic acids from coal. This performs the same function as using a chemical such as a conventional alkaline compound or acidic compound. Conventionally, these chemical substances generate toxic gases when reacting with an acid base with strong acid or strong alkali, cause environmental problems such as air pollution, have harmful problems for workers, and the process of manufacturing these compounds also causes environmental pollution. The present invention has an effect capable of extracting soluble humic substances or fulvic acids in an environmentally friendly manner without using harmful chemicals to solve these problems.

The present invention aims to perform environmentally friendly extraction without the use of hazardous chemicals, but a small amount of electrolytic substances such as sodium chloride and potassium chloride or strong acid or strong alkali compounds may be used to further increase the extraction rate if necessary. In this case, the concentration of the strong alkali compound is not limited, but may be a concentration of 0.01 to 10 M, specifically 1 to 5 M, based on 1 g of coal, and the strong acid compound is preferably 0.01 to 0.4 M, preferably May be 0.05 to 0.2M.

In addition, the alkali solution includes potassium hydroxide (KOH), sodium hydroxide (NaOH), lithium hydroxide (LiOH), potassium carbonate (K ₂ CO ₃ ), sodium carbonate (Na ₂ CO ₃ ), lithium carbonate (LiCO ₃ ), and the like. And sodium hydroxide, potassium hydroxide, or a mixture thereof, but is not limited thereto. Further, the acidic compound may include any one or more selected from nitric acid, sulfuric acid, hydrochloric acid, phosphoric acid, fluoric acid, citric acid, and oxalic acid, but is not limited thereto.

Electrolyzed water supply step of introducing the electrolyzed solution into the first and second agitation tanks connected to the cathode and anode tanks, and electrolyzing the filtrate in the first and second agitation tanks supplied with the electrolytic water again. The composition of the combination of the circulating steps flowing into each of the cathode and anode tanks of the tank is more effective in efficiently extracting soluble corrosive substances in alkaline water and fulvic acid in acidic water through pH adjustment without using harmful chemicals.

In the filtrate in the first stirring tank and the second stirring tank, as the extraction reaction proceeds, the amount of anion or cation production decreases, and when the pH in each stirring tank increases or decreases in the direction of alkali or acid, the extraction reaction is completed and filtration is completed. The liquid is recovered. In one aspect, the case where the electrolysis water in the first stirring tank exhibits a high pH, for example, pH 11 or higher, is considered to be a time when the soluble corrosive substance is sufficiently dissolved by the electrolysis water, that is, the extraction reaction is completed. To recover. In other words, if it is stabilized to a preset pH range in each agitation tank while the repeated progression of a combination of electrolysis, agitation of the slurry through the supply of electrolytic water, and a circulating step continues, a filtrate containing soluble corrosive substances or fulvic acid from the coal slurry A recovery step is carried out to recover.

In this case, the filtrate may have a pH in the first stirring tank of 9.0 or higher and a pH in the second stirring tank of 3.0 or lower. When the above range is reached, the pH of alkaline water or acidic water generated by electrolysis is stabilized, and the filtrate in the stirring tank is completed for extraction of a desired soluble corrosive substance or fulvic acid, respectively. In addition, when the pH of the cathode tank is high during recovery, the filtrate of the anode tank may be mixed with the filtrate of the cathode tank or neutralized by mixing the filtrate of the cathode tank with the filtrate of the anode tank for neutralization.

The liquid soluble humic acid solution or fulvic acid solution obtained in the recovery tank by the recovery step is obtained as a powder by a conventional method. In one example, the obtained by-product acid is filtered, washed and dried to obtain a soluble humic powder. Specifically, the filtrate in the stirring tank is obtained by solid-liquid separation through a filter, and concentrated and dried to obtain a soluble corrosive substance powder. At this time, the obtained powder may be washed with one or two or more mixtures selected from volatile alcohol-based compounds such as ethanol, methanol, and propanol to remove impurities such as inorganic metal ions to increase purity.

The recovering step may be performed by separating the fulvic acid solution obtained from the second stirring tank, and then, by adding the remaining solid content, which is pulverized coal from which fulvic acid is extracted, to the first stirring tank, separating and extracting humic acid.

Hereinafter, an electrolysis extraction apparatus according to the present invention and an electrolysis extraction method using the same will be described in more detail through examples. However, the following examples are only one reference for explaining the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

(Example 1)

200 g of lignite (C: 43.3 wt%, H: 4.7 wt%, N: 1.1 wt%, O: 36.1 wt%) indicated in Table 1 below was crushed to 100 µm or less using a grinder, and then the pulverized particles Dry at 105° C. for 60 minutes. Thereafter, the pulverized particles were placed in a first stirring tank filled with 20 L of tap water to make a coal slurry, and then stirred to flow the filtrate separated from the coal slurry into a negative (-) tank through a circulation line. In addition, the pulverized particles were put in a second stirring tank filled with 20 L of tap water to make a coal slurry, and then stirred to flow the filtrate separated from the coal slurry into a positive electrode (+) tank through a circulation line.

After the filtrate flowing into the cathode and anode tanks was filled, a voltage of 48 V was applied through a control unit, a current of 50 A was flowed, and the temperature in the electrolysis tank was maintained at 50° C. to perform an electrolysis process. At this time, the electrolysis tank is provided with a cellulose electrolyte membrane to separate the alkaline water and the acidic water and prevent organic substances from passing through.

Subsequently, the filtrate that has undergone electrolysis in the cathode and anode tanks is circulated to the first and second agitation tanks as electrolytic water, and again flows into the electrolysis tank while stirring in each agitation tank. This repeated circulation and inflow was allowed to continue to be carried out by a water pump. Thereafter, as the process proceeded, after confirming that the pH of the cathode tank was 10.16 and the pH of the anode tank was 3.87, the process was performed for 1 hour, then the pH in the cathode tank was 10.9, the pH in the anode tank was 2.3, and the pH was reached. The reaction was stopped when the value stabilized. Next, the filtrate was obtained in each of the first stirring tank and the second stirring tank, and then the soluble humic substance and fulvic acid were dried at 110° C., followed by washing with ethanol to obtain a soluble humic substance powder and fulvic acid powder. . The yield of the produced corrosive powder was calculated by comparing with the amount of organic matter in the initial lignite. The total content of carbon, hydrogen, nitrogen and oxygen in the lignite was set to 85.2% by weight.

(Equation 1) Yield (%) of corrosive powder = (100 / 85.2) * Mass of corrosive material after drying / Mass of initial dried coal * 100

(Comparative Example 1)

The lignite shown in Table 1 according to Example 1 (C: 43.3wt%, H: 4.7wt%, N: 1.1wt%, O: 36.1wt%) is crushed to 100㎛ or less, and then crushed particles Dry at 105° C. for 60 minutes. 100 g of the lignite particles were mixed with 2 L of a 2.5 M aqueous sodium hydroxide solution and mixed for 1 hour at 30°C using a homogenizer to prepare a mixed solution. The pH of the mixed solution was between 11 and 12, and nitric acid was added to adjust the pH of the final solution to pH 10.

The prepared mixed solution was separated by solid-liquid using a centrifuge at 10,000 rpm to obtain a filtrate containing humic acid. The obtained humic acid was dried in a dryer at 110°C for a day to prepare a powder. Thereafter, the impurities were removed by washing the powder with ethanol, and the remaining ethanol was removed by drying under reduced pressure. Finally, a 41 g soluble corrosive powder having high purity was prepared. The yield of the produced corrosive powder was calculated by comparing with the amount of organic matter in the initial lignite.

As a result, as shown in FIG. 3, based on the first stir bath, soluble corrosive substances were extracted from the lignite in a 49% yield compared to the organic content, which is a case of using a method of extraction using a conventional alkali solution (41%). Compared to the environmentally friendly process, it was confirmed that it shows a remarkably high efficiency.

Analysis of trace elements of used coal Element Concentration(wt%) Std.Dev. Al 5.49 0.0160 Si 9.85 0.0170 S 0.16 0.0054 K 1.64 0.0045 Ca 0.07 0.0012 Ti 0.06 0.0011 Mn 0.03 0.0008 Fe 0.91 0.0022

As described above, the present invention has been described by a limited embodiment, but this is provided only to help a more comprehensive understanding of the present invention, and the present invention is not limited to the above embodiments, and general knowledge in the field to which the present invention pertains Various modifications and variations can be made by those who have this description.

Therefore, the spirit of the present invention is not limited to the described embodiments, and should not be determined, and all claims that are equivalent or equivalent to the scope of the claims as well as the claims to be described later belong to the scope of the spirit of the invention.

10: electrolysis tank
20: stirring tank
30: recovery tank
40: control unit

Claims (8)

An electrolytic bath comprising a cathode tank, an anode tank and a separator,
A powdered coal slurry stirring tank including a first stirring tank and a second stirring tank connected to the cathode tank and the anode tank, respectively.
A circulation line for supplying the filtrate from which the fine coals obtained from the fine powder coal slurry of the first and second stirring tanks are removed to each of the cathode and anode tanks, and
Control unit for controlling voltage and temperature in the electrolysis tank
Electrolysis extraction apparatus comprising a. According to claim 1,
The extraction device is connected to the first stirring tank and the second stirring tank electrolysis extraction apparatus including a recovery tank for recovering the filtrate when the pH concentration of the filtrate from which the fine coal is removed satisfies a set range. According to claim 1,
The stirring tank is an electrolysis extraction device comprising a filter for separating the solid phase. Using the electrolysis extraction device according to claim 1 to 3,
An electrolysis step in which the filtrate from which each fine coal is removed in the first stirring tank and the second stirring tank for stirring the fine powder coal slurry is introduced into each of the cathode and anode tanks of the electrolysis tank and then electrolyzed;
An electrolytic water supply step of introducing the electrolyzed solution into the first and second stirring tanks connected to the cathode and anode tanks, respectively;
A circulating step in which the filtrate in the first stirring tank and the second stirring tank supplied with the electrolytic water is introduced into the cathode and anode tanks of the electrolysis tank, respectively
Recovery step of recovering the filtrate after the filtrate in the first stirring tank and the second stirring tank is stabilized to a preset pH range
Electrolysis extraction method comprising a. The method of claim 4,
The pulverized coal slurry is an electrolysis extraction method comprising pulverized coal pulverized to a size of 0.1 to 200㎛ The method of claim 4,
The circulating step is an electrolysis extraction method that is repeated until the pH of the filtrate in the first stirring tank is 9 or higher and the pH of the filtrate in the second stirring vessel is 3 or lower. The method of claim 4,
The recovery step is to recover each of the filtrate when the pH of the filtrate in the first stirring tank is 9 or higher and the pH of the filtrate in the second stirring tank is 3 or lower. The method of claim 4,
Stirring the coal slurry comprises electrolysis or high-speed agitation.

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