KR102167917B1 - A method for reforming hot coal, a method for producing coke, and a method for producing pig iron - Google Patents

Abstract

The method for reforming hot-silent coal of the present invention has a gist of reducing the hot-silent carbon. In addition, the method for producing coke of the present invention has a gist of producing a reformed coal by a method of reforming a hot-red coal, and drying the reformed coal. In addition, the method for manufacturing pig iron of the present invention has a gist of producing coke by the method for producing coke, injecting the obtained coke together with limestone and iron ore into a blast furnace, and reducing iron ore. According to the present invention, it is possible to provide a method of reforming hot coal, a method of manufacturing coke, and a method of manufacturing pig iron, which are useful for manufacturing coke having high strength at low cost.

Description

A method for reforming hot coal, a method for producing coke, and a method for producing pig iron

The present invention relates to a method for reforming hot coal, a method for producing coke using the reformed coal obtained by the reforming method, and a method for producing pig iron using the coke.

As a raw material for coke, a blended coal obtained by mixing high-quality coking coal (hereinafter sometimes referred to as "high-quality coal") and hot coals such as lignite and sub-bituminous coal having a low caking component are widely used. However, as the reserves of high-quality coal are small and the number of years to be covered is decreasing, prices are rising. Therefore, the production of coke in which the blending amount of hot nitric coal is increased is required. However, as the blending amount of the hot nitric coal increases, the strength of coke tends to decrease, so that sufficient coke strength cannot be obtained, and coke easily differentiates within the blast furnace. As a result, there has been a problem that the air permeability in the blast furnace is impaired and the progress of appropriate reduction of iron ore is inhibited. In view of these circumstances, in recent years, studies have been conducted on increasing the strength of coke mixed with hot nitrile coal.

For example, in Patent Document 1, in a method of heating the raw coal charged to an actual coke oven by a coal heater in advance, charging by an air flow dryer equipped with a classification function before and/or after the charged coal by the coal heater A method of rapid heating of coal for separating and removing pulverized coal of 0.1 mm or less contained in coal is disclosed. According to this patent document 1, it is described that non-caking coal can be mixed and used with 40 to 60% charged coal by preheating the non-caking coal, and the strength of coke can be improved.

Japanese Patent Laid-Open No. Hei 7-109465

However, in Patent Literature 1, problems such as an increase in manufacturing cost arise when considering the facility introduction cost, maintenance cost, etc., such as the need for a facility for performing rapid heating.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for reforming hot coal and a method for manufacturing coke useful for manufacturing coke having high strength at low cost, and a method for manufacturing pig iron.

The present invention, which has been able to solve the above problems, has a gist of reducing thermal coal.

The reduction treatment is preferably performed in the presence of a reducing agent, and the reducing agent is also in a gaseous or liquid state.

In addition, the reduction treatment is preferably performed for 10 minutes to 6 hours in a temperature range of room temperature to 65°C. In the present invention, the reducing agent is preferably at least one selected from the group consisting of formic acid and oxalic acid.

The present invention also includes a method for producing a coke in which reformed coal is manufactured by the above-described method for reforming the thermally brittle coal, and the reformed coal is dried.

In addition, the present invention includes a method for producing pig iron in which coke is produced by the above production method, and the obtained coke is put into a blast furnace together with limestone and iron ore, and the iron ore is reduced.

According to the present invention, a reformed coal having an effect of improving coke strength is obtained. In addition, high-strength coke can be produced by using the modified coal of the present invention. Moreover, according to the manufacturing method of the present invention, since conventional coke manufacturing equipment can be used as it is, high-strength coke can be manufactured at low cost. Further, since the coke of the present invention has sufficient strength, crushing, differentiation, etc. in the blast furnace can be prevented, and therefore, it is suitable as coke for manufacturing pig iron.

1 is a graph showing the results of measuring softening and melting properties of coke produced by the present invention and coke produced by a conventional method.
2 is a graph showing the results of measuring softening and melting properties of coke produced by the present invention and coke produced by a conventional method.
3 is a graph showing the results of measuring softening and melting properties of coke produced by the present invention and coke produced by a conventional method.
Figure 4 is a graph showing the strength measurement results of the coke prepared by the present invention and the coke prepared by the conventional method.
5 is a graph showing strength measurement results of coke prepared by the present invention and coke prepared by a conventional method.

Thermal nitrogen contains a large number of oxygen-containing functional groups, and when heated, pyrolysis radicals are easily generated at a relatively low temperature, and the radicals are bonded to each other to form a crosslinked structure. Therefore, even when heated in the softening melting temperature range of about 400 to 500°C, it is believed that movement of coal molecules is hindered, the fluidity of coal is insufficient, caking properties are suppressed, and the strength of coke is reduced.

As a result of intensive research conducted by the present inventors, it was found that the fluidity in the softening and melting temperature range can be improved and high-strength coke can be obtained, and the present invention came to the present invention by using hot-gitrous coal subjected to a reduction treatment in advance as a coke raw material. .

The process of reaching the present invention is as follows. In other words, as a result of the research of the present inventors, there are unstable radicals with high reactivity even in the temperature range of about 65°C from room temperature, and if these radicals are stabilized, even if heated to the softening melting temperature range, the It has been found that crosslinking reactions, polymerization reactions, etc. can be suppressed. Specifically, it was found that the radicals could be converted into stable molecules by subjecting the hot nitrogen to a reduction treatment. In the case of coking of thermally nitric coal (hereinafter referred to as ``reformed coal'') subjected to a reduction treatment, even when reaching the softening and melting temperature range, formation of the crosslinked structure, etc., is suppressed, while the fluidity of coal is improved, Since the orientation of the coal molecules is improved and crystallinity is increased, it is considered that a solid coke structure is obtained at a resolidification temperature or higher, and as a result, high strength coke is obtained. Hereinafter, a method for reforming thermal coal and a method for producing coke according to the present invention will be described.

The object of modification of the present invention is hot coal. Thermal coal refers to coal with a calorific value of 5700 kcal/kg or less and a volatile content of 31% or more. Examples of such hot coals include lignite such as Victoria Tan, North Dakotatan and Belgatan; Sub-bituminous coals such as Seobankotan, Nonungantan, and Samarangautan are exemplified. The thermal coal of the present invention is not limited to the above examples, and the vitrnit average reflectance Ro is 0.85% or more, the Gizeller maximum fluidity logMF is 10 ddpm or less, or the vitrinit average reflectance Ro is 0.85% or less, Non-caking coals with a maximum flow logMF of less than 50 ddpm are also included.

In addition, in order to improve the reduction treatment efficiency, it is preferable to pulverize the hot coal to a diameter of preferably 5 mm or less, more preferably 3 mm or less.

In the present invention, the hot-nitrogen carbon is modified by reduction treatment, but the reduction treatment method is not particularly limited, and the radicals in the hot-nitrogen carbon may be stabilized by the reduction treatment. In other words, the amount of hot nitrogen radicals after the reduction treatment may be reduced. Although it is difficult to directly measure the amount of radicals before and after the reduction treatment, for example, when the reduction treatment is performed as shown in the examples of the present invention, the fluidity is improved in the softening melting temperature region than when the reduction treatment is not performed. Or, if the coke strength is improved, it can be determined that the amount of radicals is reduced by the reduction treatment, and that the hot coal has been modified.

In the reduction treatment of the present invention, it is preferable to use a reducing agent. By using a reducing agent, it is possible to efficiently reform the hot coal. In particular, in the case of using as coke for pig iron production, if the reducing agent is converted into carbon dioxide by a reduction treatment, it is preferable because the mixing of unnecessary components for pig iron production can be prevented. Therefore, the reducing agent is preferably an organic reducing agent. Among the organic reducing agents, lower alcohols, aldehydes, and carboxylic acids that can become steam in a temperature range of room temperature to 65°C are preferable. Methanol, 2-propanol, etc. are mentioned as such alcohols. Moreover, as aldehydes, formaldehyde, acetaldehyde, propionaldehyde, butylaldehyde, valeraldehyde, etc. are mentioned. Moreover, formic acid, oxalic acid, etc. are mentioned as a carboxylic acid. Among these, more preferably carboxylic acids, and particularly preferably formic acid or oxalic acid. The hot nitrogen obtained by reduction treatment using such a reducing agent was modified as described above.

When formic acid is used as a reducing agent, hydrogen and electrons are donated to hot nitric coal by a reaction represented by the following formula, so that radicals in hot nitric coal can be stabilized.

^{_{HCOOH → CO 2 + 2H + +}} 2e -

In addition, when oxalic acid is used as a reducing agent, hydrogen and electrons are donated to hot nitric coal by a reaction represented by the following formula, so that radicals in hot nitric coal can be stabilized.

_{(COOH) 2 → 2CO 2 +} 2H + + 2e -

As a result of donating hydrogen and electrons to the hot nitrile by the reducing agent, the radicals contained in the hot nitrile are stabilized, so when the reformed coal obtained as described above is heated in the softening melting temperature range, the fluidity of the coal is improved and high strength coke is produced. Is obtained. In the case of using a reducing agent, if the contact efficiency is increased by stirring or the like, since the reduction treatment can be efficiently performed, it is preferable.

The reducing agent may be in a gaseous state or a liquid state. When the reducing agent is used in a gaseous state, for example, steam obtained by heating the reducing agent may be brought into contact with hot nitrogen. In addition, when a reducing agent is used in a liquid state, for example, an aqueous solution containing a reducing agent (hereinafter, sometimes referred to as “aqueous solution containing a reducing agent”) may be brought into contact with hot nitric coal to perform a reduction treatment. As a contact method, hot nitric coal may be immersed in an aqueous solution containing a reducing agent, or an aqueous solution containing a reducing agent may be sprayed onto the hot nitric coal. In addition, when the reducing agent is used in a gaseous state, for example, the reducing agent is heated and vaporized in a closed space containing hot nitric coal, or the vapor obtained by heating the reducing agent outside may be supplied to the closed space.

The amount of reducing agent consumed in the reduction treatment varies depending on the type of hot nitric coal used, but the electron donation amount is estimated to be about 0.2 mmol/g-coal, and based on this, in the case of formic acid, 0.45% by mass (dry coal Standard), in the case of oxalic acid, it is 0.9% by mass (based on dry coal). Since the reducing agent not involved in the reduction reaction retains the original molecular state and retains the reducing ability, it is preferable to recover and recycle the unreacted reducing agent after the reduction treatment.

The reaction temperature during the reduction treatment is not particularly limited. When the reaction temperature is increased, the reducing agent is easily diffused on the surface of the hot nitric coal, and the reduction reaction is promoted, thereby improving production efficiency. Therefore, the temperature during the reduction reaction is preferably room temperature or higher, more preferably 40°C or higher. On the other hand, the upper limit of the reaction temperature is not limited as long as it is lower than the softening and melting temperature of coal, but considering the heating cost and diffusion into the coal surface and the coal substrate, it is preferably 65° C. or less, and more preferably 60° C. Below. The reaction temperature may be adjusted by heating by any means.

In addition, the time for the reduction treatment is not limited as long as sufficient reduction is performed, but is preferably 10 minutes or more, more preferably 30 minutes or more, preferably 6 hours or less, and more preferably 2 hours or less.

After the reduction treatment, the reformed coal obtained by performing the reduction treatment may be subjected to cooling treatment, washing treatment in which the reducing agent is removed with water or the like, and drying treatment in which the reduced carbon after the washing treatment is dried as necessary.

Even if a reducing agent is used for the reforming of hot coal, the reformed coal does not contain components other than C, H, and O derived from the reducing agent, and the manufacturing process of pig iron does not contain unnecessary components derived from the coke. It is suitable as raw material coal of

The reduction treatment of the hot nitrogen may be performed at any timing before the coking treatment, preferably before being heated to the softening melting temperature, and is not limited. For example, a reduction treatment may be performed with hot-nitrogen coal having low carbon in a low coal yard or the like, or a reduction treatment may be performed during transport of coal. By pre-coking the hot-gitrous coal prior to the coking treatment, high-strength coke can be produced without increasing the lead time for coke production, or without any new modifications or additions to the existing coke production facility. It is also preferable from a viewpoint.

Hereinafter, a method of producing coke using the modified coal obtained by performing the reduction treatment as a raw material for coke will be described, but the method for producing coke is not particularly limited, and a conventional coke production method can be employed. Therefore, the manufacturing method of coke is not limited to the following example, and may be appropriately changed. The coke manufacturing method of the present invention has a mixing process and a drying process.

<Mixing process>

First, a mixture is prepared using the reformed coal as a raw material for coke. In the mixing process, a mixture is obtained by mixing reformed coal and other coals or caking additives added as necessary. The mixing method of the reformed coal and the caking agent is not particularly limited, and a uniform mixture may be obtained. For mixing, known means such as a mixer, a kneader, and a mixer may be used.

In the present invention, reformed coal may be used alone as a raw material for coke, but other coals may be blended together with the reformed coal (hereinafter sometimes referred to as "raw coal"). The type of other coal to be used is not particularly limited, and at least one selected from the group consisting of strong caking coal, semi-caking coal, non-caking coal, and non-caking coal is preferably used. In the present invention, the term “strong coking coal” refers to coal having a bitrinet average reflectance Ro greater than 1.1 to 1.5% and a Giseller maximum fluidity logMF of 0.5 to 3.5 ddpm, and semi-caking coal refers to a bitrinet average reflectance Ro of 0.7 to 1.1%, Coal and non-caking coal having a maximum Gizeller fluidity logMF of greater than 2.5 to 3.5 ddpm and a non-caking coal mean Vitrnitt average reflectance Ro of 0.7 to 1.1% and a Gizeller maximum fluidity log MF of 0.5 to 2.5 ddpm. In addition, the vitrinit average reflectance Ro is JIS M8816, and the Giseller maximum fluidity logMF is the highest fluidity based on the Giselle plastometer method specified in JIS M8801.

Although the reformed coal of the present invention is made from hot coal as a raw material, as described above, the reformed coal contributes to the high strength of coke. For this reason, high-strength coke can be obtained even by the reformed coal alone as the raw material coal, but in the case of mixing the reformed coal and other coals to form a compounded coal, the strength of the coke is improved when the amount of the modified coal is increased. Therefore, if the blending amount of the modified coal is increased, high-strength coke can be obtained even if the blending ratio of the coking coal is reduced compared to the conventional one.

In addition, strong coking coal, semi-strong coking coal, non-caking coal, and non-caking coal may be used in combination of a plurality of types, and may be appropriately combined according to the characteristics of coke required. Increasing the blending amount of hard coking coal improves the strength of coke. In addition, since quasi-strong coking coal has a viscosity succeeding to that of strong coking coal, and has characteristics such as high fluidity and high expandability, the properties of the combined coal can be controlled by appropriately combining these coals. In addition, when the blending amount of non-caking coal and non-caking coal is increased, the strength of coke is lowered.

In order to improve the strength of coke, the particle size of the raw coal may be appropriately determined in consideration of the industrially possible pulverized particle size range and dust, and is not limited. For example, it is preferable that the raw coal has a particle diameter of preferably 80% by mass or more, more preferably 85% by mass or more, and still more preferably 90% by mass or more, and 3 mm or less. In addition, in this invention, "particle size" is a value calculated|required by the particle size test method described in JIS M8801.

In the present invention, if necessary, a caking additive may be used, and various known caking additives such as petroleum-based pitch, coal-based pitch, and solvent-extracted coal can be used as the caking material. The mixing ratio of the raw coal and the caking additive is not particularly limited. In the present invention, from the viewpoint of improving the coke strength, it is preferable to adjust the fluidity after mixing the caking agent. The fluidity can be improved, for example, by adjusting the Gieseller maximum fluidity log MF to preferably 1.5 to 3.5 ddpm, more preferably 2.0 to 3.0 ddpm, thereby improving the coke strength. In addition, the mixing ratio of the caking additive may be appropriately determined according to properties such as coke reactivity required and the fluidity and reactivity of the raw coal used.

On the occasion of preparation of the mixture, a known additive or the like may be contained as necessary.

In the present invention, iron ore in a desired ratio may be mixed with the mixture. Further, the mixture may be molded into a desired shape. The molding method is not particularly limited, for example, a double roll molding machine using a flat roll, a double roll molding machine having an almond-shaped pocket, a single screw press or a roller type molding machine, an extrusion molding machine, etc. can be employed.

The forming may be either cold forming performed before or after room temperature, or hot forming performed by heating. Hot forming is preferably performed at a thermal decomposition temperature of coal exceeding room temperature, for example, less than 400°C, more preferably 250 to 350°C. If the temperature is higher than 400°C, coal is pyrolyzed and tar is generated, which may cause loss of coal components. The molding pressure is not particularly limited, and known conditions may be employed.

The size of the molded article obtained through the above-described molding differs depending on the type of raw iron ore or coal, production conditions, or operating conditions in a blast furnace, but is about 10 to 30 mm.

<Drying process>

The drying step is a step of drying the mixture obtained in the mixing step. By drying, the coal portion is coke, and coke can be produced.

The drying process can be performed using an existing coke oven. The shape of the furnace used at the time of carbonization is also not particularly limited, and may be dried in a batch type using a thread furnace, or may be dried continuously using a vertical shaft furnace. In the case of using a vertical shaft furnace, the molded body is charged from the upper side of the furnace, and it is carbonized while moving from the top to the bottom of the furnace, and is discharged from the lower side of the furnace. The mixture may be preheated as necessary.

The drying conditions, such as the drying temperature and the drying time, can also adopt known conditions, and the drying temperature is preferably 650°C or higher, more preferably 700°C or higher, preferably 1200°C or lower, and more preferably 1110 Below ℃. Further, the drying time is preferably 5 minutes or more, more preferably 10 minutes or more, preferably 24 hours or less, and more preferably 12 hours or less. The drying atmosphere is preferably a non-oxidizing gas atmosphere from the viewpoint of preventing the oxidation of coal.

In the method for producing coke, a new step may be provided during or before and after each step, within a range that does not adversely affect each step. For example, a coal crushing step of pulverizing raw coal, a step of adjusting softening and melting properties by heat treatment, a removal step of removing unnecessary substances such as dust, and the like may be performed.

The obtained coke of the present invention has a higher strength than coke using conventional hot-gitrous coal as raw coal, and specifically, the coke strength of the present invention is 0.4 MPa or more, preferably 0.5 MPa or more, more preferably 1.0 MPa or more. It has strength.

Since the coke obtained by the manufacturing method of the present invention is excellent in strength, it can be suitably used for manufacturing pig iron in a blast furnace. That is, since the coke obtained by the production method of the present invention has sufficient strength not to be crushed, it is effective for improving gas permeability during the production of pig iron in a blast furnace.

The manufacturing method of pig iron in the blast furnace may be a known method, for example, limestone, iron ore and coke are alternately stacked in a layered manner in the blast furnace, and hot air is blown from the bottom of the blast furnace, if necessary, pulverized coal. There is a method.

Example

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is of course not limited by the following examples, and of course, the present invention is appropriately changed within a range suitable for the purpose described before and after. It is possible, and they are all included in the technical scope of the present invention.

Coke raw materials were prepared based on the following (1) to (3) using the hot nitric coal shown in Table 1. In addition, the analysis method of hot nitrogen is as follows.

Element content (dry ash free): The content rate (mass%) of elements of organic matter (C, H, O, N) excluding moisture and ash of coal measured in JIS M8801

Ash and volatile content: JIS M8812

(1) Coal reduction treatment A

10 g of F coals or 10 g of G coals and 250 mL of 0.5 mol/L formic acid aqueous solution were placed in a 500 mL Erlenmeyer flask, and the temperature was shaken for 6 hours while maintaining the temperature at 65°C to perform a reduction reaction. After the reduction reaction, coal was taken out, washed with water, and dried to obtain reduced coal. The reduced coal using F coal was referred to as reduction treatment A-F coal, and the reduced coal using G coal was referred to as reduction treatment A-G coal.

(2) Coal reduction treatment B

After filling 10 g of F charcoal or 10 g of G charcoal into a sealed container having an inner volume of 250 mL, a beaker having a diameter of 2 cm and a height of 4 cm containing 3 ml of 99% formic acid was placed in the sealed container to seal the container. The temperature of the sealed container was maintained at 60° C. for 2 hours or 6 hours to perform a reduction reaction. After the reduction reaction, the coal was taken out and cooled to room temperature to obtain reduced coal. Reduction treatment of reduced coal maintained for 2 hours using F coal B2-Reduction treatment of reduced coal maintained for 2 hours using F coal and G coal reduction treatment B2-G coal and reduction treatment of reduced coal maintained for 6 hours using G coal B6 -It was called G bullet.

(3) manufacturing method of coke

Into a stainless steel mold having an inner diameter of 1.7 cm and a height of 1.4 cm, 2 g of untreated F coals or 2 g of untreated G coals, or 2 g of F coals or G coals subjected to reduction treatment under the above conditions were charged, and 34.8 gf of the coals A cover made of stainless steel was installed on the top of the coal bed so that the load of was applied. The mold was installed inside a container in a vertical heating furnace. The inside of the container was heated to 900°C at a temperature increase rate of 10°C/min under nitrogen flow rate of 0.1 NL/min, and maintained at the temperature for 30 minutes to perform a coking reaction to obtain each coke sample.

Using untreated coal and reduced coal, the softening meltability was evaluated by the following softening meltability measurement test, and using each coke sample produced from untreated coal and reduced coal, the coke strength was evaluated by the following strength measurement test. I did.

Softening Meltability Measurement Test

The softening and melting properties of each untreated coal and each reduced coal were evaluated using thermomechanical analysis (manufactured by Shimadzu Corporation: TMA-50). Untreated coal or reduced coal is charged to a cell having an inner diameter of 5.2 mm and a height of 6.0 mm to a thickness of about 1 mm, and a load of 10 gf is applied thereto by a cylindrical quartz rod having a diameter of 4.3 mm, under a nitrogen atmosphere at 10°C/ It heated up to 900 degreeC at min, and the change of the position of the rod was continuously measured when the sample was softened and melted and the rod was pressed into the sample layer. In this measurement, the higher the softening and melting property, the larger the change in the position of the rod appears.

Strength measurement test

Each coke sample was used as it is for strength measurement. A crush strength test of coke was conducted using a precision universal testing machine (autograph AGS-10kNJ manufactured by Shimadzu Corporation) to evaluate the strength of coke.

Fig. 1 shows the results of softening and melting properties of the untreated coals F and the reduced-treated coals A-F, and Fig. 2 shows the results of measuring the softening and melting properties of the untreated G coals and the reduced-treated A-G coals. In Figs. 1 and 2, softening and melting properties were improved by performing a reduction treatment with an aqueous formic acid solution in any hot nitric coal.

Fig. 3 shows the results of measuring the softening and melting properties of the untreated G coal, the reduced treated B2-G coal, and the reduced treated B6-G coal. In Fig. 3, it can be seen that softening and melting properties are improved even by performing a reduction treatment with formic acid vapor.

Fig. 4 shows the results of measuring the strength of each coke produced from the untreated coal F, the reduced processing A-F coal, the untreated G coal, and the reduced processing A-G coal. As shown in Fig. 4, coke produced from reduced coal has a coke strength of about 3 to 6 times higher than that of coke produced from untreated coal.

Fig. 5 shows the results of measuring the strength of each coke produced from untreated F coal, reduced treated B2-F coal and untreated G coal, reduced treated B2-G coal, and reduced treated B6-G coal. As shown in Fig. 5, coke produced from reduced coal has a coke strength of about 2 to 5 times higher than that of coke produced from untreated coal. In addition, coke produced from reduced-treated B6-G coal with a reduction time of 6 hours further increased the coke strength, and was approximately 2.5 times as high as that of coke prepared from reduced-treated B2-G coal, produced from untreated G coal. Compared with coke, the strength is improved by about 5 times.

In Figs. 1, 2, and 3, it has been found that softening and melting properties can be improved by performing a reduction treatment of hot nitric coal. This is considered to be because the crosslinking reaction in the softening melting temperature range was suppressed by stabilizing the radicals present in the hot nitric coal by performing a reduction treatment. In addition, in FIGS. 4 and 5, it was found that the coke strength can be improved by using the reformed coal subjected to the reduction treatment on the hot-nitrogen coal. Moreover, when the reduction treatment time was lengthened, the strength showed a tendency to further improve. This is considered to be because a more robust coke structure was formed as a result of a long reduction treatment time and sufficient reduction treatment, a decrease in the amount of unstable radicals present in the hot nitric coal, and an improvement in softening and melting performance.

Although the present invention has been described in detail with reference to specific aspects, it is clear to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention. In addition, this application is based on Japanese Patent Application No. 2016-133282 for which it applied to Japan on July 5, 2016, The whole is used by reference.

Claims (10)

As a reforming method of hot-nitrogen carbon by reducing treatment,
The reduction treatment is performed in the presence of an organic reducing agent that becomes carbon dioxide by the reduction treatment. The method of claim 1,
The organic reducing agent is a reforming method of thermal coal that can be vapor in the temperature range of room temperature to 65 ℃. The method of claim 2,
The organic reducing agent is at least one selected from lower alcohols, aldehydes and carboxylic acids. The method according to any one of claims 1 to 3,
The organic reducing agent is at least one selected from methanol, 2-propanol, formaldehyde, acetaldehyde, propionaldehyde, butylaldehyde, valeraldehyde, formic acid and oxalic acid. The method according to any one of claims 1 to 3,
The organic reducing agent is at least one selected from the group consisting of formic acid and oxalic acid. The method according to any one of claims 1 to 3,
The organic reducing agent is a gaseous or liquid reforming method of thermal coal. The method according to any one of claims 1 to 3,
The reduction treatment is a method of reforming hot-nitrogen coal that is treated for 10 minutes to 6 hours in a temperature range of room temperature to 65°C. A method for producing coke in which reformed coal is produced by the method for reforming the hot-red coal according to any one of claims 1 to 3, and the reformed coal is dried. A method for producing pig iron in which coke is produced by the production method according to claim 8, and the obtained coke is put into a blast furnace together with limestone and iron ore to reduce iron ore. delete

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