RU2781407C1 - Method for producing a coal mixture and method for producing coke - Google Patents

Abstract

FIELD: mixing.

SUBSTANCE: inventions relate to coal mixtures and use thereof. Described is method for producing a coal mixture, including mixing multiple coals, wherein the following formula (1) and formula (2) are satisfied:

(1),,

α_calc≤1,2×10^-10 (mol/g of coal) (2); wherein, in formula (1) and formula (2), α_calc represents the hydrogen ion releasing capacity per unit mass (mol/g of coal) for the coal mixture, α_i represents the hydrogen ion releasing capacity per unit mass (mol/g of coal) for coal i, x_i represents the fraction in the mixture for coal i admixed with the coal mixture, and N represents the total number of coal brands contained in the coal mixture, wherein the hydrogen ion releasing capacity per unit mass for the coal is calculated by dividing the product of the concentration of hydrogen ions, calculated from the pH value for the water wherein each of the coals is submerged and the volume of water wherein the coal is submerged, by the mass of each of the corresponding coals. Described is a method for producing coke, including: loading the coal mixture produced using the above method for producing a coal mixture into the coke chamber of a coke oven and coking the coal mixture to produce coke.

EFFECT: suppressed reduction in the fluidity of coal.

3 cl, 3 dwg, 4 tbl

Description

The technical field to which the invention belongs

The present invention relates to a method for producing a coal mixture that is used to produce coke, and relates to a method for producing a coal mixture in which fluidity can be maintained at a high level for a longer period of time than existing techniques, and a method for producing coke using such coal mixture.

State of the art

In order to produce pig iron in a blast furnace, it is first necessary to alternately load and layer-by-layer the blast furnace with iron ores and coke, iron ores and coke are heated by high-temperature hot air blown through tuyeres, and at the same time, iron ores are reduced and smelted by the influence of CO gas formed mainly from coke. In order to ensure the stable operation of such a blast furnace, it is effective to improve the gas and liquid permeability of the furnace. For this purpose, it is essential to use a coke having excellent properties such as strength, particle size and strength after reaction. First of all, strength is considered as a particularly important property.

Coke strength is usually controlled by using as an indicator, for example, the drum strength DI (150/15) as measured by the drum strength method specified in JIS K 2151. The quality of the coal that determines the drum strength , mainly includes coal grade (Ro, JIS M 8816) and fluidity (MF, JIS M 8801) (Non-Patent Literature 1 and 2).

The fluidity of coal is known to decrease over time due to deterioration of the quality of the material as a result of oxidation in air, which is referred to as "atmospheric aging". After extraction from the mine, the coal is repeatedly transported and stored until it is loaded into the coke oven, and the coal is typically exposed to air for extended periods of time of several weeks or more. Accordingly, it is generally difficult to avoid a decrease in coal flow due to atmospheric aging. Therefore, it was highly desirable to develop a technology for inhibiting the atmospheric aging of coal.

In order to inhibit the atmospheric aging of coal, it is effective to reduce the contact between coal and oxygen to the least possible extent. Patent Literature 1 discloses a technique in which dry ice is circulated through perforated pipes installed at the bottom of a coal pile to effect carbon dioxide replacement of the atmosphere. In addition, Patent Literature 2 discloses a technique in which an inert gas is blown from the bottom. In addition, Patent Literature 3 discloses a technique in which a coating is applied to the surface layer for the purpose of suppressing diffusion of oxygen from a surface layer into the interior of a coal pile. In addition, a method of storing coal in water, a method of storing coal in a sealed coal storage tank, a method in which the surface layer of a pile of coal is compacted using heavy equipment, and the like are known (Non-Patent Literature Source 3).

List of citations

Patent Literature Sources

IPL 1: Japanese Unexamined Patent Application Publication No. 60-12405

IPL 2: Japanese Unexamined Patent Publication No. 60-148830

IPL 3: Japanese Unexamined Patent Publication No. 3-157492

Sources of non-patent literature

INPL 1: Takashi Miyazu and 4 others: "Coal blending plan and evaluation of coking coal", Nippon Kokan Technical Report, vol. 67, 1975, pp. 125-137

INPL 2: Miyazu, et al., Nippon Kokan Technical Report-overseas, December 1975, p. one

INPL 3: Miura, "Weathering of coal and coal storage", Journal of the Fuel Society of Japan, vol. 58, no. 622, 1979, pp. 112-122

Disclosure of invention

Technical problem

The techniques disclosed in Patent Literature 1 and Patent Literature 2 have the problems of requiring specialized equipment to inject an inert gas including carbon dioxide from the bottom of the coal pile at the location where the coal pile is placed, and the expense for used gas. In the pig iron industry, the amount of coal used and stored in open storage is several hundred thousand tons or more. Consequently, the size of the corresponding equipment increases, its cost increases, and the operating costs also increase. Therefore, the advantage of inhibition of atmospheric aging is offset and sufficient economic benefits are not obtained. In addition, in the technique disclosed in Patent Literature 3 in which the surface layer is coated, there are also problems in that a coating material spray operation is required and material costs are incurred. In addition, in the method of storing coal in water, the method of storing coal in a sealed coal storage tank, and the method in which the surface layer of a pile of coal is compacted using heavy equipment, similarly, there are problems of requiring capital investment and operating costs.

The present invention has been made in view of the problems described above, and the object of the invention is to provide a method for the production of a coal mixture, in which it is possible to suppress the decrease in coal flow better than existing methods using a simple method that does not require excessive capital investment or operating costs.

Solution

Features of the present invention that solves these problems are as follows:

[1] A method for producing a coal mixture, including mixing a plurality of coals, in which the following formula (1) and formula (2) are satisfied:

... (1)

... (one)

α _calc ≤ 1.2 × 10 ^-10 (mol/g coal), ... (2)

where in formula (1) and formula (2), α _calc is the hydrogen ion release capacity per mass unit (mol/g coal) for the coal mixture, α _i is the hydrogen ion release capacity per unit mass (mol/g coal) for of coal i, x _i represents the proportion in the mixture for coal i mixed with the coal mixture, and N represents the total number of coal grades contained in the coal mixture.

[2] The production method of the coal mixture according to [1], in which the hydrogen ion releasing capacity per unit mass of coal is calculated by dividing the product of the hydrogen ion concentration calculated from the pH value of the water in which each of the coals is immersed and the volume of water , in which the coal is immersed, by the mass of each of the corresponding coals.

[3] The coal mixture production method according to [1] or [2], wherein the coal mixture is produced before being transferred to a coking plant equipped with a coke oven.

[4] A method for producing coke, including charging a coal mixture produced by using a coal mixture production method according to any one of [1] to [3] into a coke chamber of a coke oven and coking the coal mixture to produce coke.

Beneficial effects of the invention

According to the present invention, it is possible to suppress the decrease in coal flow due to atmospheric aging by using a very simple method of mixing a plurality of coals. Typically, mines, order processing centers, shipping ports and coke plants are provided with coal mixing equipment that handles the coal to adjust the quantity and quality of the coal product. Because the present invention can be implemented using such existing equipment, the atmospheric aging of coal can be inhibited without the need for additional capital investment in equipment.

Brief description of the drawings

Fig. 1 is a graph showing the relationship between reaction time and coal flow.

Fig. 2 is a graph showing the change in pH value for various grades of coal over time.

Fig. 3 is a graph showing the relationship between the hydrogen ion releasing capacity of a coal mixture and pre-return-post-treatment fluidity.

Implementation of the invention

As found by the present inventors, the rate of atmospheric aging of coal varies depending on the pH value (i.e., concentration of hydrogen ions) of the water that adheres to the coal, and the amount of hydrogen ions that are dissolved in the water varies depending on the types of coal, and thus, as considered by the present inventors, by mixing different types of coal and adjusting the pH value of the coal adhesion water, it is possible to controllably keep the atmospheric aging rate of the coal at a low level. As a result of conducting careful research to test this hypothesis, the inventors of the present invention have found the optimal conditions under which it is possible to better suppress the decrease in flow due to atmospheric aging of coal as a result of transporting and storing coals as a mixture of coals, instead of individually transporting and storing coals.

First, the effect of the pH value of the treatment water on the atmospheric aging rate of the coal will be described. The coal was immersed in treatment waters with different pH values and the changes in coal flowability over time were checked. The pH value for the treatment waters was adjusted using hydrochloric acid and pure water to bring the pH value in the range from 2.0 to 5.6. Table 1 shows the properties of the used coal.

Table 1

Ro(%) logMF (ddpm/log) TI (%) Coal A 0.69 0.95 54.4

Fig. 1 is a graph showing the relationship between reaction time and coal flow. The horizontal axis in Fig. 1 represents the reaction time (h) and the vertical axis represents logMF (dial divisions per minute (ddpm)/log) for coal. As shown in FIG. 1, it has been found that as the pH value of the treatment water decreases, the decrease in the flowability of the coal becomes more rapid and the atmospheric aging of the coal proceeds more rapidly. As is known, as the pH value decreases, the redox potential increases, and as the redox potential increases, the aqueous solution becomes more oxidizing. As judged from the above result, as coal is treated with an aqueous solution having a lower pH, coal oxidation is promoted and atmospheric coal oxidation is accelerated.

Next, a description will be given with respect to the pH value of water obtained after immersing each of the various grades of coal in a predetermined amount of water, and the hydrogen ion releasing capacity per unit mass of coal, which is determined by the pH value. Each of the different grades of coal in the amount of 50 g was immersed in 400 ml of pure water, and the changes in the pH value of water heated to 60°C over time were measured. The hydrogen ion release capacity is calculated by dividing the product of the hydrogen ion concentration calculated from the pH value of the water and the volume of water in which the coal is immersed by the weight of the immersed coal. Table 2 shows the ability to release hydrogen ions for each of the grades of coal. In the case of a small hydrogen ion releasing capacity, the pH value of the water in which the coal is immersed increases to more than 7 as the hydrogen ions are taken up from the water.

table 2

Grade of coal pH (-) Hydrogen ion release capacity (mol/g coal) Coal B 3.6 1.9 × 10 ^-6 Coal C 7.5 2.3 × 10 ^-10 Coal D 6.3 4.1 × 10 ^-9 Coal E 8.1 6.7 × 10 ^-11 Coal F 8.9 1.1 × 10 ^-11

Fig. 2 is a graph showing the change in pH value for various grades of coal over time. The horizontal axis in Fig. 2 represents the immersion time (min) and the vertical axis represents the pH value of the water in which the coal is immersed. As shown in FIG. 2, the pH value for the water in which the coal was immersed varied widely from acidic to basic, depending on the grades of coal. There is a possibility that this result may be due to differences in the amounts of water-soluble sulfate minerals, as well as the types and amounts of organic acids contained in coal. As described above, due to the wide variation in the pH value of the water in which the coal was immersed, depending on the grades of coal, as shown in the results from Table 2, the hydrogen ion releasing capacity of the coal varied widely depending on the grades of coal. .

As judged by the present inventors from these results, by mixing coals having different hydrogen ion releasing abilities, the pH value of the adhesive water adhering to the coals is controlled, and thus atmospheric aging of the coal mixture can be inhibited. That is, as it was calculated, since the amount of water that adheres to coal (moisture content) during transportation and storage of coal is approximately 10 wt.%, between the coals constituting the coal mixture, with the help of 10 wt.% adhesive water, reactions occur under the influence of acids and bases, and these reactions affect the rate of atmospheric aging of coal, and it has been found that by mixing a plurality of coals in such a way that the pH value of the adhesive water increases, it is possible to suppress the reduction in fluidity due to atmospheric aging of coal mixtures. Thus, the present invention has been made. The present invention will be described below using embodiments of the invention.

In the coal mixture production method according to one embodiment, by mixing a plurality of coals so that the α _calc value calculated using the formula (1) below is 1.2 × 10 ^-10 (mol/g coal) or less , produce coal mixture. That is, by mixing individual grades of coal, a coal mixture is produced that satisfies both formula (1) and formula (2) below.

... (1)

... (one)

α _calc ≤ 1.2 × 10 ^-10 (mol/g coal) ... (2)

In formula (1) and formula (2), α _calc is the hydrogen ion releasing capacity per mass unit (mol/g coal) for coal mixture, α _i is the hydrogen ion releasing capacity per mass unit (mol/g coal) for coal i, x _i is the mixture ratio for coal i mixed with the coal mixture, and N is the total number of coal grades contained in the coal mixture.

In this case, α _i is the hydrogen ion releasing capacity per unit mass (mol/g of coal) of coal i mixed into the coal mixture. The hydrogen ion releasing capacity is calculated by measuring the pH value of the water in which the coal that is a candidate for blending into the coal mixture is immersed and dividing the product of the concentration of hydrogen ions calculated from the indicated pH value and the volume of water in which the coal is immersed, by the mass loaded coal. When the amount of water in which the coal is immersed is too small, the hydrogen ion dissolution reaction does not reach equilibrium, and according to the calculation, the hydrogen ion release capacity is excessively small, which is undesirable. When the amount of water in which the coal is immersed is excessively large, the change in the hydrogen ion concentration due to the immersion of the coal is small, and the measurement accuracy of the hydrogen ion releasing capacity deteriorates, which is undesirable. Therefore, when measuring the pH value of water in which coal is immersed, the weight ratio between coal and water (charcoal:water) is preferably in the range of 1:1 or more to 1:100 or less.

As shown in FIG. 2, the pH value of the water in which the coal is immersed changes slightly until the dissolution reaction reaches equilibrium. Accordingly, it is preferable to measure the pH value after equilibrium has been reached. A higher temperature of the water in which the coal is immersed is preferred. As the temperature of the water increases, the dissolution reaction is promoted and the time until the dissolution reaction reaches equilibrium is shortened. Thus, the pH value can be measured faster. In addition, a longer period of time from immersion of the coal in water up to the measurement of the pH value is preferred.

On the other hand, if the temperature of the water in which the coal is immersed is excessively high, or the time period until the pH value is measured is excessively long, the carbon undergoes atmospheric aging, which is undesirable. From these points of view, it is preferable to set the temperature of the water in which the coal is immersed in the range of 0°C or higher to 80°C or lower, and to set the period of time during which the coal is immersed in the range of 1 hour or more to 2 hours or less. As the size of the coal particles decreases, the period of time until the pH value reaches equilibrium decreases, but atmospheric aging is likely to proceed faster. Therefore, there is no need to make a decision on grinding coal into a fine powder. Since agitation during immersion of the coal can shorten the time until the pH reaches equilibrium, agitation can be carried out. However, even without agitation for the case where the coal is immersed for 1 hour or more, the pH value comes very close to the equilibrium value. Therefore, the coal can simply be immersed in water without agitation.

In this way, if it is possible to calculate the hydrogen ion releasing capacity of a coal candidate for blending into the coal mixture, the product of the hydrogen ion releasing capability for each of the coals blended into the coal blend and the corresponding proportion in the mixture is calculated. The types of coal and the corresponding proportion in the mixture are determined so that the total sum of the products would be 1.2 × 10 ^-10 (mol/g of coal) or less. The share in the mixture x _i is calculated by dividing the mass of mixed coal i by the mass of the coal mixture.

For example, in the case of mixing two coals to produce a coal mixture, when one coal has a hydrogen ion releasing ability of more than 1.2 × 10 ^-10 (mol/g of coal), a coal having an ion releasing ability is selected as the other coal. hydrogen, which is less than 1.2 × 10 ^-10 (mol/g of coal). The mixture ratio for each of the coals is determined so that the total sum of the products of the hydrogen ion releasing abilities and the mixture ratios for coals is 1.2×10 ^-10 (mol/g coal) or less. As a result of determining the types of coal to be mixed into the coal mixture and the corresponding proportion in the mixture in this manner and carrying out the mixing, it is possible to produce a coal mixture in which the decrease in fluidity due to atmospheric aging is suppressed.

The mixed coals can be mixed using a widely used mixing method. Examples of the coal mixing method include a method in which mixing is carried out in a transfer section of a conveyor belt, a method in which mixing is carried out in a hopper, a method in which mixing is carried out using heavy equipment, a method in which special mixing equipment is used such as mixing bins in a warehouse open storage or mixing bins, and mixing method when using a mixer. Transportation and storage of coal can also be carried out using commonly used methods. By pulverizing a plurality of types of coal at the same time, pulverization and mixing can be combined.

As described above, the method for producing a coal mixture according to the embodiment can be carried out by only mixing a plurality of coals so that the value of α _calc calculated using the above formula (1) is 1.2 × 10 ^-10 ( mol/g of coal) or less, and therefore can be carried out using a simple method without the need for excessive capital investment or operating costs. In addition, by charging the coal mixture in which the decrease in coal flowability is suppressed into the coking chamber of the coke oven and carrying out coking, coke having high strength can be produced.

As the time of transportation and storage of coal increases, the degree of decrease in fluidity due to atmospheric aging increases. Accordingly, it is preferable to carry out the method for producing a coal mixture according to the embodiment as early as possible after coal mining, and it is preferable to carry out the method at least before transferring the coal to a coker equipped with a coke oven. Thus, the effect of suppressing the decrease in fluidity can be increased.

EXAMPLES

Following this, the evaluation results of coal mixtures produced by using the method for producing coal mixture according to the embodiment will be described. When using a thermostat for the purpose of adjusting the atmospheric aging conditions, changes in the fluidity of coal mixtures were checked for the case of mixing two grades of coal and storing them in a thermostat as a coal mixture (before treatment in a thermostat) and for the case of separate storage in a thermostat of the same two grades of coal, and after that they are mixed with each other (after treatment in a thermostat). Table 3 shows the properties, pH value and the ability to release hydrogen ions for the used coal. Charcoal (50 g) was immersed in 400 ml of pure water kept at 60° C., and after the coal was immersed in water for 2 hours, the hydrogen ion releasing capacity of the carbon was calculated from the pH value of the water.

Table 3

Grade of coal Ro(%) logMF (ddpm/log) TI (%) pH (-) Hydrogen ion release capacity (mol/g coal) Coal a 0.73 3.99 20.7 8.5 2.3 × 10 ^-11 Coal b 0.99 1.89 35.5 8.3 3.8 × 10 ^-11 Coal c 1.00 2.83 33.3 7.6 2.0 × 10 ^-10 Coal d 1.33 1.81 33.0 8.6 2.2 × 10 ^-11 Coal e 0.85 3.53 18.8 3.6 2.1 × 10 ^-6 Coal f 0.86 3.49 16.8 6.9 1.0 × 10 ^-9 Coal g 0.93 2.82 26.6 8.9 1.1 × 10 ^-11 Coal h 0.76 2.33 21.7 7.6 1.9 × 10 ^-10 Coal i 1.06 2.48 7.6 7.6 2.3 × 10 ^-10

Each of the grades of coal shown in Table 3 was pulverized to a particle size of 9.6 mm or less. To produce a coal mixture, two grades of coal were mixed in such a way that the mass ratio in terms of dry matter was 1 : 1, and the moisture content was adjusted to 12 wt.%. The charcoal mixture was filled into a closed container, and the closed container was kept in a thermostat maintained at 50°C for 2 weeks. After that, the fluidity of the coal mixture was measured.

On the other hand, each of the same grades of coal as mentioned above was pulverized to a particle size of 9.6 mm or less, and the coal, the moisture content of which was adjusted to 12 mass%, was filled into a closed container. and the closed container was kept in a thermostat maintained at 50°C for 2 weeks. Following this, for the production of a coal mixture, two grades of coal after storage were mixed in such a way that the mass ratio when calculating the dry matter was 1 : 1. The fluidity of the coal mixture was measured. The results of this are shown in Table 4.

Table 4

level number Mark 1 Mark 2 Hydrogen ion release capacity (mol/g coal) logMF (ddpm/log) Before treatment in a thermostat After treatment in a thermostat Before processing - after processing one Coal e Coal c 1.0 × 10 ^-6 2.22 2.38 -0.15 2 Coal e Coal h 1.0 × 10 ^-6 2.04 2.31 -0.27 3 Coal f Coal c 6.0 × 10 ^-10 2.76 3.05 -0.28 four Coal f Coal h 6.0 × 10 ^-10 2.81 2.90 -0.09 5 Coal c Coal h 1.9 × 10 ^-10 2.20 2.37 -0.17 6 Coal a Coal h 1.1 × 10 ^-10 3.23 3.10 0.13 7 Coal d Coal i 1.2 × 10 ^-10 1.67 1.66 0.01 eight Coal d Coal a 2.3 × 10 ^-11 2.56 2.45 0.11 9 Coal d Coal g 1.6 × 10 ^-11 1.88 1.72 0.16 ten Coal e Coal i 1.0 × 10 ^-6 2.23 2.23 0.01 eleven Coal e Coal a 1.0 × 10 ^-6 2.98 3.09 -0.11 12 Coal e Coal g 1.0 × 10 ^-6 2.43 2.57 -0.14 13 Coal e Coal d 1.0 × 10 ^-6 1.28 1.26 0.02 fourteen Coal f Coal d 5.1 × 10 ^-10 1.98 1.99 -0.01 fifteen Coal g Coal i 1.2 × 10 ^-10 2.24 2.20 0.04 16 Coal c Coal a 1.1 × 10 ^-10 3.00 2.92 0.09 17 Coal g Coal c 1.1 × 10 ^-10 1.81 1.72 0.09 eighteen Coal d Coal c 1.1 × 10 ^-10 1.04 0.95 0.09 19 Coal d Coal h 1.0 × 10 ^-10 0.78 0.40 0.38 twenty Coal c Coal h 1.9 × 10 ^-10 1.08 1.00 0.08 21 Coal g Coal h 9.9 × 10 ^-11 1.18 0.95 0.22

The value shown in the "Hydrogen ion releasing capacity" column of Table 4 is the hydrogen ion releasing capacity per unit mass for the coal mixture (α _calc ) calculated using the formula (1) described above. For example, for the case of level No. 1 of Table 4, the calculation was made as [hydrogen ion releasing capacity of coal e (2.1 × 10 ^-6 ) × corresponding proportion in the mixture (0.5)] + [hydrogen ion releasing capacity of coal c (2.0 × 10 ^-10 ) × corresponding proportion in the mixture (0.5)].

The value shown in the "Before Incubation" column is the measured flow value for a coal mixture that was produced by mixing two grades of coal prior to incubation and then incubation. The value shown in the "After incubation" column is the measured flow value for a coal mixture produced by separately incubating the same two grades of coal as mentioned above and mixing the coals after storage. The value presented in the column "Before treatment - after treatment" is the difference between the measured value "before incubation" and the measured value "after incubation".

Fig. 3 is a graph showing the relationship between the hydrogen ion releasing capacity of a coal mixture and pre-return-post-treatment fluidity. The horizontal axis in Fig. 3 represents the hydrogen ion releasing capacity of the coal mixture (mol/g of coal) and the vertical axis represents pre-treatment-post-treatment fluidity (ddpm/log). In this case, a positive pre-treatment-after-treatment fluidity indicates a small decrease in fluidity when the coals are incubated as a coal mixture compared to when the coals are separately incubated as individual coals. On the other hand, a negative pre-treatment-post-treatment fluidity indicates a large decrease in fluidity when the coals are incubated as a coal mixture compared to when the coals are separately incubated as individual coals.

As shown in FIG. 3, as the hydrogen ion releasing capacity of the coal mixture decreased, the pre-treatment-after-treatment flow value tended to show a positive value. In particular, in all coal blends having a hydrogen ion releasing capacity of 1.2×10 ^-10 or less, the pre-treatment-after-treatment fluidity was positive. A charcoal mixture for which the decrease in fluidity was small was obtained when the charcoal oven was stored as a charcoal mixture, as compared to the case of the charcoal oven separately as individual charcoals. As confirmed by the results, by producing the coal mixture so that its hydrogen ion releasing capacity is 1.2×10 ^-10 or less, it is possible to suppress the decrease in fluidity compared to the individual coals to be mixed into the coal mixture. In particular, in the case of the hydrogen ion releasing capacity of 1.0×10 ^-10 or less, the pre-treatment-after-treatment flow value was more than 0.1. As this result shows, it is more preferable to produce the coal mixture such that its hydrogen ion releasing capacity is 1.0×10 ⁻¹⁰ or less.

Claims (9)

1. A method for producing a coal mixture, including mixing a plurality of coals, in which the following formula (1) and formula (2) are satisfied:

, (one) α _calc ≤1.2×10 ^-10 (mol/g coal), (2) where in formula (1) and formula (2), α _calc is the hydrogen ion release capacity per unit mass (mol/g of coal) for the coal mixture, α _i is the hydrogen ion release capacity per unit mass (mol/g of coal) for coal i, x _i is the mixture fraction for coal i mixed with the coal mixture, and N is the total number of grades of coal contained in the coal mixture, with the hydrogen ion release capacity per unit mass for coal calculated by dividing the product of the hydrogen ion concentration calculated from the pH value of the water in which each of the coals is immersed and the volume of water, in which the coal is immersed, by the mass of each of the corresponding coals. 2. A method for producing a coal mixture according to claim 1, wherein the coal mixture is produced prior to being transferred to a coke plant equipped with a coke oven. 3. A method for producing coke, including loading the coal mixture produced by using the method for producing coal mixture according to claim 1 or 2 into the coke chamber of the coke oven and coking the coal mixture to produce coke.

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