Method for evaluating softening and melting properties of coal or binding material

Abstract

An evaluation method of softening and melting properties of coal and a binding material using an apparatus having a container that houses coal and a stirrer arranged in the container, which calculates a penetration distance of the coal or the binding material using a value indicating a shape of semicoke formed by rotating the stirrer while heating the coal or the binding material, and a correspondence relation between the value indicating the shape of the semicoke and the penetration distance of the coal or the binding material.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for evaluating the softening and melting properties of coal or a binder material which becomes a raw material for metallurgical coke. BACKGROUND

[0002] In order to produce molten iron in a blast furnace, the metallurgical coke used as a raw material for the blast furnace is preferably high in strength. This is because if a coke low in strength is used as a raw material for the blast furnace, the coke is pulverized in the blast furnace, the powder hinders the permeability of the blast furnace, and stable production of molten iron cannot be performed. Therefore, from the viewpoint of obtaining a coke high in strength or not lowering the strength of the coke, a technique for evaluating coal or a binder material which is a raw material for metallurgical coke is required.

[0003] Coke is produced by dry distilling a mixed coal in which various coal for coke production, which is pulverized and adjusted in particle size, is blended in a coke oven. The coal for coke production, the binder material is dry distilled and softens and melts in the temperature range of about 300°C to 550°C, and, at the same time, foams and expands with the generation of volatile components, whereby the particles adhere to each other to become a blocky semicoke. The semicoke shrinks and sinters in the process of being heated to the vicinity of 1000°C thereafter to become a hard coke (coke cake). Therefore, the adhesion properties of the coal, the binder material at the time of softening and melting have a great influence on the strength, particle size, and the like of the coke after dry distillation.

[0004] In order to evaluate the softening and melting behavior of the coal, the binder material in the coke oven, it is required to measure the softening and melting properties of the coal, the binder material in the state of the surrounding environment of the coal, the binder material which has undergone softening and melting in a simulated coke oven. The coal, the binder material which has undergone softening and melting in the coke oven and the surrounding environment thereof are described in detail below.

[0005] In the coke oven, the coal softens and melts in a state of being restrained by the adjacent layers. The coal here also includes a mixture of coal and a binder material. Since the thermal conductivity of the coal is small, the coal is heated unevenly in the coke oven, and the states of the coke layer, the softening and melting layer, and the coal layer are different from the side of the oven wall which is a heating surface. The coke oven itself expands a little at the time of dry distillation, but hardly deforms, and therefore the coal which has undergone softening and melting is restrained by the adjacent coke layer and coal layer. In addition, there are a large number of defect structures around the coal which has undergone softening and melting, such as inter-particle voids of the coal layer, inter-particle voids of the softening and melting coal, coarse pores generated by the volatilization of pyrolysis gas, cracks generated in the adjacent coke layer, and the like. In particular, the cracks generated in the coke layer are considered to have a width of several hundred micrometers to several millimeters or so, which is large compared with the inter-particle voids of the coal having a size of several tens to several hundred micrometers or so, and the pores. It is considered that not only the pyrolysis gas, liquid material which are by-products generated from the coal, but also the softening and melting coal itself permeate into such coarse defects generated in the coke layer. In addition, it is predicted that the shear rate acting on the softening and melting coal at the time of the permeation differs depending on the kind of the coal.

[0006] An evaluation method of softening and melting characteristics of coal or a binding material is disclosed in Patent Literature 1. Specifically, a coal or a binding material is filled in a container to make a test sample, a material having through holes in upper and lower surfaces is arranged on the test sample, the test sample and the material having through holes in upper and lower surfaces are heated while maintaining a certain volume or under a state of being loaded with a certain load, and a penetration distance of a molten test sample penetrating into the through holes of the material is measured. Further, an evaluation method of evaluating the softening and melting characteristics of the coal or the binding material using the measured value is disclosed.

[0007] Prior Art Documents

[0008] Patent Literature

[0009] Patent Literature 1: Japanese Patent No. 5062353 SUMMARY

[0010] However, the method of measuring the penetration distance disclosed in Patent Literature 1 is a method of heating while applying a load to the coal or the binding material, or measuring a distance of a molten material of the coal or the binding material penetrating into a material having through holes between upper and lower surfaces while heating with a certain volume. Further, a special device needs to be introduced for this, and there is a problem that it is not easy to start the measurement. The present application is an application accomplished in view of such a problem, and aims to provide an evaluation method of softening and melting characteristics of coal, which can easily calculate a penetration distance of the coal or the binding material without using a special device.

[0011] A means for solving the above problem is as follows.

[0012] (1) An evaluation method of softening and melting characteristics of coal or a binding material, which is an evaluation method of softening and melting characteristics of coal or a binding material using a device having a container that accommodates the coal or the binding material, and a stirrer arranged in the container, calculates a penetration distance of the coal or the binding material using a value indicating a shape of a semicoke formed by heating the coal or the binding material while rotating the stirrer, and a correspondence relation between the value indicating the shape of the semicoke and the penetration distance of the coal or the binding material.

[0013] (2) The evaluation method of softening and melting characteristics of coal or a binding material according to (1), wherein the value indicating the shape of the semicoke is at least one of a height b of the semicoke in the container on an inner side wall, a height a of the semicoke adhering to the stirrer, a difference between the height a and the height b, i.e., a-b, and a degree of adhesion (a-b) / a indicated by the height a and the height b.

[0014] (3) The method for evaluating the softening and melting properties of coal or a binding material according to (1) or (2), wherein the device is a Gieseler plastometer, and the temperature at which the coal or binding material is heated is a temperature higher than the re-solidification temperature of the coal or binding material.

[0015] In the method for evaluating the softening and melting properties of coal or a binding material of the present application, the Gieseler plastometer generally used in facilities in which coal is processed to produce coke is used. Moreover, since the penetration distance can be calculated using a value indicating the shape of the semicoke after the Gieseler fluidity is measured, the softening and melting properties of coal or a binding material can be easily evaluated without using a special device. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a vertical sectional view showing the Gieseler plastometer 10 that can be used in the method for evaluating the softening and melting properties of coal or a binding material of the present embodiment.

[0017] Figure 2 is a graph showing the relationship between the height a of the semicoke adhering to the stirrer and the penetration distance of the coal.

[0018] Figure 3 is a graph showing the relationship between the height b of the semicoke from the bottom surface of the inner side wall and the penetration distance of the coal.

[0019] Figure 4 is a graph showing the relationship between the difference (a-b) between the height a of the semicoke adhering to the stirrer and the height b of the semicoke from the bottom surface and the penetration distance of the coal.

[0020] Figure 5 is a graph showing the relationship between the degree of adhesion [(a-b) / a] and the penetration distance of the coal. DETAILED DESCRIPTION

[0021] The present application is a method for evaluating the softening and melting properties of coal or a binding material using a value indicating the shape of semicoke formed from coal or a binding material heated in a device having a container in which the coal or binding material is accommodated and a stirrer disposed in the container. The present inventors found that the height a of the semicoke adhering to the stirrer after the Gieseler fluidity is measured, the height b of the semicoke from the inner side wall of the container, the difference between the height a of the semicoke adhering to the stirrer and the height b from the inner side wall of the container, and the degree of adhesion (a-b) / a each have a correlation with the penetration distance of the coal, and completed the present application. The present application will be described below through embodiments thereof.

[0022] Figure 1is a vertical sectional view showing one example of a Gieseler plastometer 10 used in the evaluation method of the softening and melting properties of coal or a binding material in the present embodiment. The Gieseler plastometer 10 has a container 12 that houses coal or a binding material that is the evaluation target, and a stirrer 14 disposed inside the container 12. The Gieseler plastometer 10 further has a not-shown drive device that rotates the stirrer 14. When the stirrer 14 is rotated while coal or a binding material is housed in the container 12, and the container 12 is heated, the heated coal or binding material becomes a softening and melting state. The coal or binding material becomes a viscoelastic body and deforms, adheres to the rotating stirrer 14, but a force that maintains the shape acts on the coal or binding material, and a force that resists rotation acts on the stirrer 14.

[0023] In the Gieseler plastometer method, the rotational speed of the stirrer 14 is measured in a state where a prescribed torque is applied to the stirrer 14, and the maximum rotational speed in the heating is taken as the Gieseler maximum fluidity MF (ddpm). The measured value is sometimes taken as the common logarithm of MF, and the Gieseler maximum fluidity is expressed as logMF. The heating conditions of coal, the size of the container 12, and the like in the Gieseler plastometer method are prescribed in JIS M 8801, and are as follows.

[0024] (1) A stirrer in which four cross bars (diameter 1.6 mm, length 6.4 mm, not shown) are installed perpendicularly to the shaft on a shaft of diameter 4.0 mm is inserted into a container of depth 35.0 mm and inner diameter 21.4 mm. Figure 1

[0025] (2) The container is filled with 5 g of coal.

[0026] (3) The container is immersed in a metal bath preheated to 300°C or 350°C, and after the temperature of the metal bath returns to the preheating temperature, heating at a rate of 3°C / min is continued until the rotation of the stirrer stops.

[0027] Note that the distance of the lowest cross bar from the bottom of the container is 1.6 mm, and the distance along the shaft between the cross bars is 3.2 mm. The two central cross bars are located 180 degrees apart in the rotational direction, and the upper and lower cross bars are also located 180 degrees apart in the rotational direction. The two central cross bars and the two upper and lower cross bars are located 90 degrees apart in the rotational direction.

[0028] ​The coal or the binder material softened and melted by the heating shows fluidity, and the molten material is resolidified by further heating, and thus the coal or the binder material heated at a temperature higher than the resolidification temperature of the coal or the binder material after the determination of the Gieseler fluidity is housed in the container 12 as the semicoke 16. The temperature at which the coal or the binder material softened and melted by the heating is resolidified is referred to as the resolidification temperature. The coal, the binder material, and the semicoke 16 are also plastic bodies, and thus the semicoke 16 is pulled by the stirrer 14 while being in contact with the inner side wall of the container 12 after the determination of the Gieseler fluidity, and the semicoke 16 maintains the shape adhered to the stirrer 14 in a bonded manner. Thus, for most of the coal or the binder material, as shown in FIG. 1, the semicoke 16 adhered to the stirrer 14 has a height a from the bottom surface of the container 12, and the semicoke 16 in contact with the inner side wall of the container 12 has a height b from the bottom surface. This behavior of the softened and melted coal or binder material is known as the Wiesenberger effect. Figure 1

[0029] The heights a and b can be measured after the disassembly of the container 12. Alternatively, after the determination of the Gieseler fluidity, the container 12 can be scanned with a microfocus X-ray CT device to obtain an image of the shape of the semicoke 16, and the heights a and b can be measured from the image. The microfocus X-ray CT device is, for example, an XTH320LC manufactured by Nikon Corporation, a phoenix v|tome|x m300 manufactured by GE Sensing & Inspection Technologies, Inc., or the like. The heights a and b have almost no difference depending on the position in the circumferential direction of the container, and thus the height of a certain specific cross section can be measured. Even in the case where the heights differ depending on the position in the circumferential direction, the heights can be measured at a plurality of cross sections, and the average of the heights can be used as the values of the heights a and b. The coal or the binder material is heated to a temperature higher than the resolidification temperature thereof at the time of the determination of the Gieseler fluidity, but the heights a and b can be obtained before the complete resolidification of the coal or the binder material. For example, the container 12 can be a transparent container, and the shape of the coal or the binder material can be observed while being heated from the outside. The heating is stopped when the shape of the softened and melted coal or binder material does not change, and the heights a and b can be obtained from the shape.

[0030] ​The shape of the semi-coke 16 after the determination of the Gieseler fluidity varies depending on the coal. It is presumed that the coal or the cohesive material having a high degree of caking or the coal or the cohesive material having a high height a of the semi-coke 16 attached to the stirrer 14 expands excessively in a softened and molten state, and thus a defective structure is easily generated in the coke after heating, which adversely affects the strength of the coke. Therefore, the inventors have considered that the shape of the semi-coke 16 in the vessel becomes an index indicating the softened and molten characteristics affecting the strength of the coke, and have investigated the relationship between the value indicating the shape of the semi-coke 16 and the penetration distance of the coal or the cohesive material as one of the softened and molten characteristics. Note that the value indicating the shape of the semi-coke 16 is, for example, the height a of the semi-coke 16 attached to the stirrer 14, the height b of the semi-coke 16 from the bottom surface, the difference between the heights a and b, i.e., a-b, or the degree of caking represented by (a-b) / a. As a result, it has been confirmed that there is a corresponding relationship between the value indicating the shape of the semi-coke 16 after the determination of the Gieseler fluidity and the penetration distance of the coal or the cohesive material.

[0031] Thus, it has been confirmed that there is a corresponding relationship between the value indicating the shape of the semi-coke 16 after the determination of the Gieseler fluidity and the penetration distance of the coal or the cohesive material. Therefore, if a regression equation representing the corresponding relationship between the value [a, b, a-b, (a-b) / a] indicating the shape of the semi-coke 16 after the determination of the Gieseler fluidity and the penetration distance of the coal or the cohesive material is obtained in advance through experiments or the like, the penetration distance of the coal or the cohesive material can be calculated from at least one of the values indicating the shape of the semi-coke after the determination of the Gieseler fluidity.

[0032] As described above, in the evaluation method of the softened and molten characteristics of the coal or the cohesive material according to the present embodiment, since the penetration distance of the coal or the cohesive material can be calculated from the value [a, b, a-b, (a-b) / a] indicating the shape of the semi-coke 16 after the determination of the Gieseler fluidity, a special device for determining the penetration distance, which performs heating while applying a load to the coal, is not required. Therefore, the penetration distance of the coal can be calculated, and the softened and molten characteristics of the coal or the cohesive material can be evaluated using the penetration distance.

[0033] The method for determining the Gieseler fluidity is prescribed in JIS M 8801 as a flowability test method, and the same method is also prescribed in ASTM and ISO. Therefore, by determining the Gieseler fluidity according to the method, values determined in different experimental facilities or different experimental devices can be compared. Furthermore, the regression equation representing the corresponding relationship between the value [a, b, a-b, (a-b) / a] indicating the shape of the semi-coke 16 and the penetration distance of the coal or the cohesive material, which is obtained in advance, can be used in other different experimental facilities or experimental devices.

[0034] Note that, in the above, an example in which a value indicating the shape of the semi-coke after the flowability test method (Gieseler plastometer method) prescribed in JIS M 8801 is used is described, but the present application is not limited thereto. The conditions prescribed in ASTM D2639, ISO 10329 are also the same as those of JIS M 8801, and thus the method prescribed in ASTM, etc. can also be used. Further, in the case where the Gieseler plastometer is not used, it is preferable to use a stirrer having a diameter of 5 to 60% of the inner diameter of the container in which the coal or the binding material is housed. Further, it is preferable to provide a cross bar in the stirrer 14, but even in the absence of the cross bar, the semi-coke 16 that has softened and melted adheres to the stirrer 14.

[0035] Further, in the present embodiment, an example in which the penetration distance of the coal or the binding material is calculated using a value indicating the shape of the semi-coke 16 after the Gieseler flowability is measured is described, but the present application is not limited thereto. For example, the penetration distance of the binding material, the coal to which the binding material is added instead of the coal, or the like can be calculated. As with the coal, these materials soften and melt by heating through the same mechanism as the coal, and further increase in temperature causes the softened and melted material to resolidify, and thus a value indicating the shape of the resolidified material can be used to calculate an estimated value of the penetration distance. Note that, as examples of the binding material, pitch such as pitch asphalt, coal tar pitch, coal-derived extracts and hydrogenated products, and materials that exhibit softening and melting properties by heating can be given. In this way, the evaluation method of the softening and melting properties of the coal or the binding material of the present embodiment can also evaluate the softening and melting properties of the binding material, the coal to which the binding material is added.

[0036] Further, as the device for measuring the shape of the semi-coke, the container used in the Gieseler plastometer method is not limiting. If a device having a container in which the coal or the binding material is housed as a test sample and a stirrer disposed in the container is used, and the test sample housed in the container is heated while the stirrer is rotated, the test sample that has softened and melted adheres to the stirrer. That is, the size of the container, the measurement conditions can be appropriately determined. Then, the value indicating the shape of the semi-coke is measured using the container, the penetration distance is calculated for the same test sample by the method described in Patent Document 1, and if the correlation of the two measurement values is calculated in advance, the penetration distance of the coal or the binding material can be estimated for any test sample by measuring only the value indicating the shape of the semi-coke.

[0037] Depending on the type of the coal or the binding material, the semi-coke 16 can be pulled by the stirrer 14 entirely, and the semi-coke 16 can not contact the inner side wall (side wall) of the container 12 at all. In this case, in the case where the expansibility of the coal or the binding material is excessively large or the stirrer 14 easily adheres to the semi-coke 16, the adhesion degree can be made 1 by substituting 0 in the height b. Further, even in this case, the adhesion degree can be calculated and the softening and melting properties of the coal can be evaluated.

[0038] Example

[0039] An example is explained below. Various coals having different permeation distances were prepared, and a value indicating the shape of semi-coke 16 after the Gieseler fluidity was measured in accordance with JIS M 8801 was measured using a microfocus X-ray CT device. Specifically, the height a of the semi-coke adhering to the stirrer, the height b of the semi-coke on the inner side wall from the floor surface, the height a-b, and the degree of adhesion (a-b) / a were investigated in relation to the permeation distance of the coal. The results of the investigation are shown in FIG. 2. Figures 2 to 5 Note that the permeation distance of the coal was measured by the method described in claim 15 of Patent Document 1.

[0040] The method described in claim 15 of Patent Document 1 is as follows. Coal or a binding material is filled in a container and a test piece is prepared, a material having through-holes in the upper and lower surfaces is arranged on the test piece, and the test piece is heated while a load is applied to the material having through-holes in the upper and lower surfaces. Then, the permeation distance of the molten test piece permeating into the through-holes is measured. In the method of evaluating the softening and melting properties of the test piece using the measured value, the preparation of the test piece includes the step of pulverizing the coal or the binding material so that the particle diameter is 2 mm or less at 100 mass%, and the step of filling the pulverized coal or the binding material in the container so that the filling density is 0.8 g / cm 3 and the layer thickness is 10 mm. In addition, the arrangement of the material having through-holes in the upper and lower surfaces includes the step of arranging glass beads having a diameter of 2 mm on the test piece so that the layer thickness is 80 mm. The heating of the test piece includes the step of applying a load from the upper portion of the glass beads so that the load is 50 kPa, and the step of heating from room temperature to 550°C at a heating rate of 3°C / minute in a non-reactive gas atmosphere.

[0041] Figure 2 is a graph indicating the relationship between the height a of the semi-coke adhering to the stirrer and the permeation distance of the coal. Figure 2 The horizontal axis of FIG. 2 is the permeation distance of the coal (mm), and the vertical axis is the height a of the semi-coke adhering to the stirrer (mm). In FIG. 2, as the permeation distance of the coal increases, the height a becomes higher, and it is understood that the permeation distance and the height a have a positive correlation. Figure 2 In addition, the determination coefficient (R 2 ) of the regression equation of the permeation distance and the height a is 0.73, and it is confirmed that the permeation distance of the coal can be calculated using the height a of the semi-coke adhering to the stirrer and the regression equation. Note that the determination coefficient (R 2 ) is an index indicating whether the regression equation is applicable to the actual data.

[0042] Figure 3 is a graph indicating the relationship between the height b of the semi-coke on the inner side wall from the floor surface and the permeation distance of the coal. Figure 3Figure 2 is a graph showing the relationship between the penetration distance of coal (mm) and the height b of the char from the bottom of the inner wall (mm). In Figure 2, as the penetration distance of coal increases, the height b becomes lower, and it is understood that the penetration distance and the height b have a negative correlation. In addition, the determination coefficient (R2) of the regression equation of the penetration distance and the height b is 0.77, and it is confirmed that the penetration distance of coal can be accurately calculated using the height b of the char from the bottom of the inner wall and the regression equation. Figure 3 2

[0043] Figure 4 Figure 3 is a graph showing the relationship between the penetration distance of coal (mm) and the difference (a-b) between the height a of the char attached to the stirrer and the height b of the char from the bottom of the inner wall (mm). Figure 4 In Figure 3, as the penetration distance of coal increases, the difference (a-b) between the heights becomes higher, and it is understood that the penetration distance and the difference (a-b) between the heights have a positive correlation. In addition, the determination coefficient (R2) of the regression equation of the penetration distance and the difference (a-b) between the heights is 0.91, and it is confirmed that the penetration distance of coal can be accurately calculated using the difference (a-b) between the heights and the regression equation shown in Figure 4. Figure 4 2 Figure 4

[0044] Figure 5 Figure 5 is a graph showing the relationship between the degree of adhesion [(a-b) / a] and the penetration distance of coal. Figure 5 In Figure 5, as the penetration distance of coal increases, the degree of adhesion [(a-b) / a] becomes larger, and it is understood that the penetration distance and the degree of adhesion have a positive correlation. In addition, the determination coefficient (R2) of the regression equation of the penetration distance and the degree of adhesion is 0.89, and it is confirmed that the penetration distance of coal can be accurately calculated using the degree of adhesion [(a-b) / a] and the regression equation shown in Figure 6. Figure 5 2 Figure 5

[0045] In the embodiment of Figure 2, measurement examples in which the penetration distance was 7 mm to 23 mm under the measurement conditions of Patent Literature 1 were shown, but a sample having a large penetration distance can also be evaluated. However, since the height a is limited by the size of the container, in order to evaluate coal and a binding material having a large penetration distance, it is preferable to use a container having a high height or to reduce the amount of the sample to measure the shape of the char. By thus setting, evaluation of a sample in which the height a is 60 mm or less under conditions in which the height of the container of the Gieseler plastometer method is changed, and a sample in which the penetration distance is 70 mm or less under the measurement conditions of Patent Literature 1 can be carried out without any problems. Figures 2 to 5 ​​​​​​​​​

[0046] These results confirm that if prior experiments are conducted, etc., the results can be obtained... Figures 2 to 5 The regression equation shown indicates that, for coal for which the penetration distance is to be determined, the penetration distance can be easily calculated using at least one of the following values: the height *a* of the coke attached to the agitator, the height *b* of the coke on the inner wall from the bottom surface, the height difference *a-b*, and the caking property *(a-b) / a*. This penetration distance can then be used to evaluate the softening and melting characteristics of the coal. It should be noted that the person who calculates the penetration distance by determining the values ​​representing the shape of the coke (e.g., the height *a* of the coke attached to the agitator, the height *b* of the coke on the inner wall from the bottom surface, the height difference *a-b*, and the caking property *(a-b) / a) can be different from the person who calculates the correspondence between the values ​​representing the shape of the coke and the penetration distance (the regression equation). Furthermore, these persons can also be different from the persons who calculate the penetration distance of the coal and the binding material. That is, the method for evaluating the softening and melting characteristics of coal or binder materials in this embodiment only requires using the value representing the shape of semi-coke and the correspondence between the value representing the shape of semi-coke and the penetration distance to calculate the penetration distance of coal or binder materials. The correspondence between the value representing the shape of semi-coke and the penetration distance can be used regardless of who derived it. It should be noted that in this embodiment and examples, the evaluation of softening and melting characteristics is mainly described using coal as the object, but binder materials can also be used as the object of evaluation for softening and melting characteristics. That is, the objects of evaluation for softening and melting characteristics include coal, binder materials, and mixtures of coal and binder materials.

[0047] Symbol Explanation

[0048] 10. Gizeler Plasticity Analyzer

[0049] 12 containers

[0050] 14. Stirrer

[0051] 16 half-burnt

Claims

1. A method for evaluating softening and melting properties of coal or a binding material, which is a method for evaluating softening and melting properties of coal or a binding material using an apparatus having a container that accommodates coal or a binding material, and a stirrer disposed in the container, the apparatus is a Gieseler plastometer, under the measurement conditions of the Gieseler plastometer method prescribed in JIS M 8801, using a value indicating a shape of a semicoke formed by heating the coal or binding material while rotating the stirrer, and a correspondence relationship between the value indicating the shape of the semicoke and a penetration distance of the coal or binding material, the penetration distance of the coal or binding material is calculated, the penetration distance refers to a penetration distance of a molten sample into a through hole of a material having the through hole in upper and lower surfaces when the sample is heated while maintaining a volume of the sample and the material having the through hole or under a state of applying a load to the sample, the sample being prepared by filling the coal or binding material in the container.

2. The method of evaluating the softening and melting properties of coal or a binding material according to claim 1, wherein, the value indicating the shape of the semicoke is at least one of a height b of the semicoke in the container on an inner side wall, a height a of the semicoke adhering to the stirrer, a difference a-b between the height a and the height b, and a degree of adhesion (a-b) / a indicated by the height a and the height b.

3. The method of evaluating the softening and melting properties of coal or a binding material according to claim 1 or 2, wherein, a temperature at which the coal or binding material is heated is a resolidification temperature of the coal or binding material or more.

2. The method for evaluating softening and melting properties of coal or a binding material according to claim 1, wherein the value indicating the shape of the semicoke is at least one of a height b of the semicoke in the container on an inner side wall, a height a of the semicoke adhering to the stirrer, a difference a-b between the height a and the height b, and a degree of adhesion (a-b) / a indicated by the height a and the height b.

3. The method for evaluating softening and melting properties of coal or a binding material according to claim 1 or 2, wherein the temperature at which the coal or binding material is heated is a resolidification temperature of the coal or binding material or more.

4. The method for evaluating softening and melting properties of coal or a binding material according to any one of claims 1 to 3, wherein the value indicating the shape of the semicoke is at least one of a height b of the semicoke in the container on an inner side wall, a height a of the semicoke adhering to the stirrer, a difference a-b between the height a and the height b, and a degree of adhesion (a-b) / a indicated by the height a and the height b.

5. The method for evaluating softening and melting properties of coal or a binding material according to any one of claims 1 to 4, wherein the temperature at which the coal or binding material is heated is a resolidification temperature of the coal or binding material or more.

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