Identification method of mixed semi-coke coal, coking coal and coking method

Abstract

The invention relates to an identification method of blended semi-coke coal, coking coal and a coking method, and belongs to the technical field of identification of coking coal. According to the identification method, other components different from a vitrinite component and an inertinite component in coal to be identified are obtained, and next detection is carried out after it is determined that the coal to be identified indeed contains the doped miscellaneous substances; carrying out a polarization interference test and a thermogravimetric pyrolysis test on the other components to obtain a polarization interference test result and a thermogravimetric test result, and simultaneously detecting the unknown component from two aspects of optical properties and physical properties; if the component is in first-grade red color, flat in surface and free of inlaid active components in a polarization interference test result, it is indicated that the component is possibly semi-coke or other coke components, and if the temperature corresponding to the maximum weight loss rate in a thermogravimetric pyrolysis test result is 500-600 DEG C, it is confirmed that the component is possibly semi-coke. The identification method has the advantages of simple process and high accuracy, can accurately identify the blended semi-coke coal, and can be widely applied to coal quality detection in coal coking.

Description

Technical Field

[0001] The present application relates to the technical field of coal detection, and in particular to an identification method for blended lignite coal, coking coal, and a coking method. Background Art

[0002] With the development of steel enterprises, the requirements for coke quality are getting higher and higher, and there are also requirements for the quality of coal blending components in the coking process. In traditional coal blending technology, the average vitrinite reflectance measurement is required to determine the degree of metamorphism and the mixed coal situation of the coal, and then make a preliminary judgment on the coal. Recently, in experiments, it was found that after a certain lean coal replaced the original lean coal used in production, the quality of coke declined significantly, while the reflectance test results were normal. Finally, it was known that the coal was mixed with lignite. It can be seen that the existing coal component judgment method cannot identify the mixed lignite coal and cannot meet production needs. Summary of the invention

[0003] The present application provides a method for identifying blended lignite coal, coking coal, and a coking method to solve the following technical problems: providing a method for identifying blended lignite coal.

[0004] In a first aspect, an embodiment of the present application provides a method for identifying blended semi-coal coal, comprising the following steps:

[0005] Obtaining other components in the coal to be identified that are different from the vitrinite component and the inertinite component;

[0006] The other components are subjected to a polarizing interference test and a thermogravimetric pyrolysis test to obtain polarizing interference test results and thermogravimetric test results, respectively;

[0007] If the polarization interference test result and the thermogravimetric pyrolysis test result both meet the set conditions, the coal to be identified is judged to be mixed with semi-coke coal;

[0008] The setting conditions include:

[0009] In the polarization interference test results, the other components meet at least one of the following conditions: first-level red, flat surface, and no embedded active ingredients;

[0010] In the thermogravimetric test results, the corresponding temperature of the maximum weight loss rate of the other components is 500°C to 600°C.

[0011] Optionally, the step of obtaining other components in the coal to be identified that are different from the vitrinite components and the inertinite components specifically includes:

[0012] Obtain the coal to be identified, perform microscopic identification on the coal to be identified, obtain vitrinite components and inertinite components; and take the parts that do not belong to the vitrinite components and inertinite components as other components.

[0013] Optionally, the polarization interference test uses a reflective polarization microscope, and a blue filter is provided in the incident light path. The reflective polarization microscope includes the following parameters:

[0014] Dry objective lens is X20-X50,

[0015] Oil immersion objective lens is X25-X60,

[0016] The eyepiece is X10,

[0017] The eyepiece should have crosshairs, and

[0018] Micrometer.

[0019] Optionally, the test process of the thermogravimetric pyrolysis test includes: subjecting the other components to a thermogravimetric pyrolysis test in an inert gas according to set conditions;

[0020] The setting conditions include the following parameters: a heating rate of 5°C / min to 20°C / min, and a maximum temperature of not less than 700°C.

[0021] Optionally, the inert gas is argon or nitrogen.

[0022] Optionally, if the polarization interference test result and the thermogravimetric pyrolysis test result both meet the set conditions, then the coal to be identified is judged to be mixed with semi-coke coal, and then further includes:

[0023] A coal rock sample of the blended semi-coke coal is obtained, and the semi-coke component area S1 and the non-semi-coke component area S2 in the coal rock sample are counted by the counting method to calculate the semi-coke ratio S1 / (S1+S2) in the blended semi-coke coal.

[0024] In a second aspect, the embodiments of the present application further provide a coking coal, including a blended semi-coke coal identified by the identification method according to the first aspect, wherein the mass fraction of the blended semi-coke coal in the coking coal satisfies at least one of the following:

[0025] When the mass of the semi-coke in the blended semi-coke coal is not less than 20% of the total mass of the blended semi-coke coal, the mass fraction of the blended semi-coke coal in the coking coal is not greater than 5%;

[0026] When the mass of the lignite in the blended lignite coal is less than 20% of the total mass of the blended lignite coal, the mass fraction of the blended lignite coal in the coking coal is not limited.

[0027] Optionally, the components of the coking coal include, by mass fraction: main coking coal: 50% to 60%, fat coal: 10% to 13%, 1 / 3 coking coal: 13% to 15%, gas coal: 10% to 12%, lean coal: 6% to 7%, and the blended lignite coal: ≤5%.

[0028] In a third aspect, the present application also provides a coking method, comprising the following steps:

[0029] The coking coal is prepared according to the components and corresponding mass fractions described in the second aspect;

[0030] Under set coking conditions, coking the coking coal to obtain coke;

[0031] Wherein, the set coking conditions include the following parameters: coking temperature is 1150°C to 1250°C, and coking time is 19h to 24h.

[0032] Optionally, the coke comprises at least one of the following parameters: compressive strength ≥ 89 MPa, abrasion resistance ≤ 5.5%, coke reactivity ≤ 22.0% and post-reaction strength ≥ 66%

[0033] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0034] The embodiment of the present application provides a method for identifying mixed blue charcoal coal, coking coal, and a coking method. The identification method obtains other components that are different from the vitrinite component and the inertinite component in the coal to be identified, and determines that the coal to be identified does contain mixed impurities before the next step of detection; the other components are subjected to polarized light interference test and thermogravimetric pyrolysis test to obtain polarized light interference test results and thermogravimetric test results, and the unknown component is detected from both optical properties and physical properties; if the component in the polarized light interference test result is a first-level red, the surface is flat, and there is no embedded active component, it means that the component may be blue charcoal or other coke-like components, and if the maximum weight loss rate in the thermogravimetric pyrolysis test result corresponds to a temperature of 500°C to 600°C, it is confirmed that the component may be blue charcoal or anthracite, so the above two results are met at the same time to determine that the coal to be identified is mixed blue charcoal coal. The identification method is simple in process, high in accuracy, can accurately identify mixed blue charcoal coal, and can be widely used in coal quality detection in coal coking. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0037] Figure 1A schematic diagram of a process for identifying blended semi-coal according to some embodiments of the present application;

[0038] Figure 2 This is the image of the coal to be identified under a microscope in Example 1;

[0039] Figure 3 It is the TGA curve diagram of other components in Example 1;

[0040] Figure 4 It is a schematic flow chart of a coking method according to some embodiments of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0042] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity and should not be understood as a rigid limitation on the scope of the present application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within the range; for example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which applies regardless of the range; in addition, whenever a numerical range is indicated in this document, it is meant to include any cited numbers (fractions or integers) within the indicated range.

[0043] In this document, the terms including "including" and "including" mean "including but not limited to". Relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone; where A and B can be singular or plural. "At least one" means one or more, and "plurality" means two or more; "at least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items; for example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple. "Parts" such as parts by weight and parts by mass indicate the proportional relationship between the components. In the proportional relationship involved in this article, the parameters that need to be described by proportion should be understood as the first term of the proportional formula in the order of description, and the proportional numbers should be understood as the second term of the proportional formula. For example, if the mass ratio of substance A, substance B and substance C is 1:2:3, then substance A, substance B and substance C should correspond to the proportional numbers in the proportional formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

[0044] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this article can be purchased from the market or prepared by existing methods.

[0045] Figure 1 A schematic diagram of a process for identifying blended semi-coal according to some embodiments of the present application;

[0046] like Figure 1 As shown, the embodiment of the present application provides a method for identifying blended blue charcoal, comprising:

[0047] S1. Obtaining other components in the coal to be identified that are different from the vitrinite component and the inertinite component;

[0048] S2. Performing a polarization interference test and a thermogravimetric pyrolysis test on the other components to obtain polarization interference test results and thermogravimetric test results, respectively;

[0049] S3. If the polarization interference test result and the thermogravimetric pyrolysis test result both meet the set conditions, it is determined that the coal to be identified is mixed with semi-coke coal;

[0050] The setting conditions include:

[0051] In the polarization interference test results, the other components meet at least one of the following conditions: first-level red, flat surface, and no embedded active ingredients;

[0052] In the thermogravimetric test results, the corresponding temperature of the maximum weight loss rate of the other components is 500°C to 600°C.

[0053] In the above embodiment, the identification method obtains other components in the coal to be identified that are different from the vitrinite component and the inertinite component, determines that the coal to be identified does contain mixed impurities, and then performs the next step of detection; the other components are subjected to polarized light interference test and thermogravimetric pyrolysis test to obtain polarized light interference test results and thermogravimetric test results, and the unknown component is detected from both optical and physical properties; if the component in the polarized light interference test result is a first-level red color, the surface is flat, and there is no embedded active ingredient, it indicates that the component may be lignite or other coke-like components, and if the maximum weight loss rate in the thermogravimetric pyrolysis test result corresponds to a temperature of 500°C to 600°C, it is confirmed that the component may be lignite or anthracite, so the coal to be identified can be judged as mixed lignite coal only when the above two results are met at the same time.

[0054] As an optional implementation manner, the step of obtaining other components in the coal to be identified that are different from the vitrinite components and the inertinite components specifically includes:

[0055] Obtain the coal to be identified, perform microscopic identification on the coal to be identified, obtain vitrinite components and inertinite components; and take the parts that do not belong to the vitrinite components and inertinite components as other components.

[0056] In the above embodiment, the coal to be identified is subjected to the microscopic components and mineral determination according to the national standard GB / T8899-1998, and the vitrinite components and inertinite components are found under natural light. At the same time, parts with lighter color, uneven surface and more obvious protrusions compared with the vitrinite components and inertinite components are also found as other components for subsequent tests.

[0057] As an optional implementation, the polarization interference test uses a reflective polarization microscope, and a blue filter is provided in the incident light path. The reflective polarization microscope includes the following parameters:

[0058] Dry objective lens is X20-X50,

[0059] Oil immersion objective lens is X25-X60,

[0060] The eyepiece is X10,

[0061] The eyepiece should have crosshairs, and

[0062] Micrometer.

[0063] In the above implementation, the polarization interference test uses orthogonal polarization and adds interference light, and the specific operation can be performed according to the national standards GB / T40485-2021 and GB / T 6948-2008.

[0064] As an optional implementation, the test process of the thermogravimetric pyrolysis test includes: subjecting the other components to a thermogravimetric pyrolysis test in an inert gas according to set conditions;

[0065] Wherein, the setting conditions include the following parameters: a heating rate of 5°C / min to 20°C / min, a maximum temperature of not less than 700°C, and further, the maximum temperature is set to 1000°C to 1100°C.

[0066] As an optional embodiment, a thermogravimetric pyrolysis test is used as a thermal analysis method to test the mass change of a substance during heating and draw a DTG curve. Among them, the heating rate and the maximum temperature setting are two key parameters. The reason for controlling the heating rate is that different heating rates will affect the pyrolysis process, mass change and final analysis results of the sample. A heating rate higher than 20°C / min will cause the sample to lose weight rapidly in a short period of time, while a heating rate lower than 5°C / min will cause the sample to gradually lose weight over a long period of time, resulting in inaccurate test results. Exemplarily, the heating rate in this application can be set to 5°C / min, 7°C / min, 10°C / min, 12°C / min, 15°C / min, 18°C / min or 20°C / min.

[0067] As an optional embodiment, the heating rate is 10℃ / min~15℃ / min.

[0068] As an optional implementation, the inert gas is argon or nitrogen.

[0069] As an optional implementation, if the polarization interference test result and the thermogravimetric pyrolysis test result both meet the set conditions, the coal to be identified is judged to be mixed with semi-coke coal, and then further includes:

[0070] A coal rock sample of the blended semi-coke coal is obtained, and the semi-coke component area S1 and the non-semi-coke component area S2 in the coal rock sample are counted by the counting method to calculate the semi-coke ratio S1 / (S1+S2) in the blended semi-coke coal.

[0071] In the above embodiment, the point counting method is adopted starting from one end of the sample, and the point where the crosshairs fall under the microscope field of view is observed to identify the microscopic components of the point. After identifying one test point, the sample is moved in a predetermined direction and step length, and the next field of view is observed until more than 500 test points are evenly distributed over the entire piece. The point spacing and line spacing are 0.4 mm to 0.6 mm, which can control and calculate the proportion of lignite in the blended lignite coal.

[0072] In summary, the embodiments of the present application provide a method for identifying blended semi-coal coal, and coking coal and coking process based on the identification method. The following is a detailed description of the invention:

[0073] Preliminary screening: First, extract components other than vitrinite and inertinite from the coal sample to be identified. The purpose of this step is to preliminarily determine whether the coal sample contains atypical impurities that may be mixed in.

[0074] Polarized light interference test: Polarized light interference test is performed on the other components extracted above. This is an optical property test, which observes the interference color and texture characteristics of the sample under polarized light through a microscope. If the test result shows that the component shows a primary red interference color, and the surface is flat and has no embedded active components, this may indicate that the component is blue coke or other coke-like components.

[0075] Thermogravimetric pyrolysis test: Thermogravimetric pyrolysis test is then carried out, which is a physical property test that observes the law of mass change with temperature by heating the sample. If the temperature corresponding to the maximum weight loss rate in the thermogravimetric test results is between 500℃ and 600℃, it further suggests that the component may be lignite or anthracite.

[0076] Comprehensive judgment: Only when the results of the polarization interference test and the thermogravimetric pyrolysis test meet the above conditions at the same time can the coal to be identified be blended lignite coal.

[0077] Application prospects: The identification method of the embodiment of the present application is simple in process and has high accuracy, and can effectively identify the mixed blue coal, thus avoiding the coking quality problems caused by uneven coal quality. The method can be widely used in coal quality detection in the coal coking industry, and is of great significance for improving the coking process and ensuring the quality of coke.

[0078] Therefore, the embodiments of the present application provide an efficient and accurate method for identifying blended lignite coal, which provides strong technical support for the coal coking industry and helps to improve production efficiency and product quality.

[0079] In a second aspect, the embodiments of the present application further provide a coking coal, including a blended semi-coke coal identified by the identification method according to the first aspect, wherein the mass fraction of the blended semi-coke coal in the coking coal satisfies at least one of the following:

[0080] When the mass of the semi-coke in the blended semi-coke coal is not less than 20% of the total mass of the blended semi-coke coal, the mass fraction of the blended semi-coke coal in the coking coal is not greater than 5%;

[0081] When the mass of the lignite in the blended lignite coal is less than 20% of the total mass of the blended lignite coal, the mass fraction of the blended lignite coal in the coking coal is not limited.

[0082] In the above-mentioned embodiment, during the preparation of coking coal, if too much lignite coal is used and the amount of lignite mixed therein reaches a certain standard, it may affect the final coking quality of the coking coal. When the proportion of lignite in the blended lignite coal exceeds 20%, as long as no more than 5% of the coking coal blended with lignite coal is used, the effect on the quality of the produced coke is small; illustratively, the mass of the blended lignite coal accounts for 1%, 2%, 3%, 4% or 5% of the total mass of the coking coal.

[0083] However, when the proportion of lignite in the blended lignite coal does not exceed 20%, the proportion of the blended lignite coal has little effect on the quality of the final coke, so no specific limitation is made. For example, the mass fraction of the blended lignite coal in coking coal can be 5%, 10%, 20%, 30%, 40%, etc., which has too great an impact on the quality of the coke.

[0084] As an optional implementation, the components of the coking coal include, by mass fraction: main coking coal: 50% to 60%, fat coal: 10% to 13%, 1 / 3 coking coal: 13% to 15%, gas coal: 10% to 12%, lean coal: 6% to 7%, and the blended lignite coal: ≤5%.

[0085] In the above implementation, the types of main coking coal, coking coal, fat coal, 1 / 3 coking coal and lean coal can be distinguished according to the classification method of GB5751-86.

[0086] In a third aspect, the present application also provides a coking method, such as Figure 2 As shown, the following steps are included:

[0087] The coking coal is prepared according to the components and corresponding mass fractions described in the second aspect;

[0088] Under set coking conditions, coking the coking coal to obtain coke;

[0089] Wherein, the set coking conditions include the following parameters: coking temperature is 1150°C to 1250°C, and coking time is 19h to 24h.

[0090] In the above embodiment, illustratively, the coking temperature can be 1150°C, 1160°C, 1170°C, 1180°C, 1190°C, 1200°C, 1210°C, 1220°C, 1230°C, 1240°C, 1250°C, and the specific coking time can be adjusted to 19h, 20h, 21h, 22h, 23h, 24h or other times according to different production conditions.

[0091] As an optional embodiment, the coke comprises at least one of the following parameters: compressive strength ≥ 89 MPa, abrasion resistance ≤ 5.5%, coke reactivity ≤ 22.0% and post-reaction strength ≥ 66%.

[0092] Based on the identified coking coal, the embodiment of the present application also provides a coking method, including the steps of crushing, screening, coal blending, coking, etc. However, since the accuracy of the raw coal quality is improved, the coal blending ratio can be optimized to improve the quality and output of coke.

[0093] The present application is further described below in conjunction with specific examples. The experimental methods in the following examples where specific conditions are not specified are usually measured in accordance with national standards / industry standards; if there are no corresponding national standards / industry standards, they are measured in accordance with common international standards, conventional conditions or conditions recommended by the manufacturer.

[0094] Example 1

[0095] This embodiment provides a method for identifying mixed blue charcoal coal, the process is as follows: Figure 1 The method comprises the following steps:

[0096] Obtain the coal to be identified, perform microscopic identification on the coal to be identified, obtain vitrinite components and inertinite components according to GB / T8899-1998; and take the parts that do not belong to the vitrinite components and inertinite components as other components, such as Figure 3 As shown, Figure 2 The lighter colored parts are the other parts.

[0097] The other components are subjected to a polarizing interference test and a thermogravimetric pyrolysis test to obtain polarizing interference test results and thermogravimetric test results, respectively;

[0098] In the polarized light interference test results, the component is primary red under the microscope, has a flat surface, and has no embedded active ingredients;

[0099] In the thermogravimetric test results, the corresponding temperature of the maximum weight loss rate of the other components is 500°C to 600°C. Figure 4 As shown, the coal to be identified is judged to be blended lignite coal.

[0100] The polarization interference test in this embodiment is carried out in accordance with the national standards GB / T40485-2021 and GB / T 6948-2008, using a reflective polarizing microscope, and a blue filter is provided in the incident light path. The reflective polarizing microscope includes the following parameters:

[0101] Dry objective lens is X20-X50,

[0102] Oil immersion objective lens is X25-X60,

[0103] The eyepiece is X10,

[0104] The eyepiece should have crosshairs, and

[0105] Micrometer.

[0106] During the thermogravimetric pyrolysis test, the heating rate was 10°C / min and the maximum temperature was 1100°C.

[0107] Example 2

[0108] The present embodiment provides a coking coal, wherein the coking coal includes blended lignite coal identified by the identification method described in Example 1, wherein the mass fraction of lignite in the blended lignite coal exceeds 20%.

[0109] The composition of the coking coal includes: main coking coal: 57%, fat coal: 11%, 1 / 3 coking coal: 12%, gas coal: 11%, lean coal: 6%, and blended semi-coke coal: 3%.

[0110] Example 3

[0111] This embodiment provides a coking method, wherein the method is as follows: Figure 2 As shown, the following steps are included:

[0112] The coking coal is prepared according to the coking coal components and corresponding mass fractions described in Example 2;

[0113] After the prepared coking coal components are fully mixed, they are crushed with a hammer crusher;

[0114] The crushed mixed coal is fed into the coking oven, the coking temperature is 1150℃~1250℃, and the coking time is 19h~24h;

[0115] Under set coking conditions, coking the coking coal to obtain coke;

[0116] After the coke is removed, the coke is dry quenched and then the cold strength index of the coke quality is measured. The results are shown in Table 1.

[0117] Comparative Examples 1 to 3

[0118] Comparative Examples 1 to 3 all adopt the same coking method as that in Example 3, except that different coking coal components are used. The specific component ratios and test results are shown in Table 1:

[0119] Table 1 Coking coal proportions and corresponding coke quality of Example 3 and Comparative Examples 1 to 3

[0120]

[0121] It can be seen from the data recorded in Table 1 that according to the coking coal ratio provided in the present invention, even if the blended blue charcoal is used for coking, the quality of the coke obtained is compared with the quality of the coke without the blended blue charcoal (Comparative Example 2), and the crushing strength only decreases by 0.4%, which meets the requirement of the crushing strength of a 4000 cubic meter blast furnace being greater than 89%. When the addition ratio of the blended blue charcoal exceeds 5%, as shown in the data in Comparative Examples 2 and 3, the quality of the coke declines seriously compared with the quality of the coke without the blended blue charcoal, and cannot meet the demand for coke in the blast furnace. Therefore, in production, attention should be paid to the performance evaluation of this type of coal, and the blended blue charcoal should be accurately identified. From the perspective of production practice, as long as the blended blue charcoal of no more than 5% is used, the quality of the coke is less affected, and the situation that the coal cannot be used at all due to the blending of blue charcoal in the coal is prevented, the economic losses are minimized, and the coking cost is saved.

[0122] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. It will be apparent to those skilled in the art that various modifications to these embodiments are possible, and the general principles defined in the present application can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown in the present application, but will conform to the widest scope consistent with the principles and novel features applied for by the present application.

Claims

1. A method for identifying blended blue charcoal, comprising the following steps: Obtaining other components in the coal to be identified that are different from the vitrinite component and the inertinite component; The other components are subjected to a polarizing interference test and a thermogravimetric pyrolysis test to obtain polarizing interference test results and thermogravimetric test results, respectively; If the polarization interference test result and the thermogravimetric pyrolysis test result both meet the set conditions, the coal to be identified is judged to be mixed with semi-coke coal; The setting conditions include: In the polarization interference test results, the other components meet at least one of the following conditions: first-grade red, flat surface, and no embedded active ingredients; In the thermogravimetric test results, the corresponding temperature of the maximum weight loss rate of the other components is 500°C to 600°C.

2. The identification method according to claim 1, wherein obtaining other components in the coal to be identified that are different from the vitrinite components and the inertinite components specifically comprises: Obtaining coal to be identified, performing microscopic identification on the coal to be identified, and obtaining vitrinite components and inertinite components; The components that do not belong to the vitrinite component and the inertinite component are referred to as other components.

3. The identification method according to claim 1, wherein the polarization interference test uses a reflective polarization microscope, and a blue filter is provided in the incident light path, and the reflective polarization microscope includes the following parameters: Dry objective lens is X20-X50, Oil immersion objective lens is X25-X60, The eyepiece is X10, The eyepiece should have crosshairs, and Micrometer.

4. The identification method according to claim 1, wherein the test process of the thermogravimetric pyrolysis test comprises: Conducting a thermogravimetric pyrolysis test on the other components in an inert gas according to set conditions; The setting conditions include the following parameters: a heating rate of 5°C / min to 20°C / min, and a maximum temperature of not less than 700°C.

5. According to the identification method of claim 4, the inert gas is argon or nitrogen.

6. The identification method according to claim 1, wherein if the polarization interference test result and the thermogravimetric pyrolysis test result both meet the set conditions, the coal to be identified is judged to be blended semi-coke coal, and then further comprises: A coal rock sample of the blended semi-coke coal is obtained, and the semi-coke component area S1 and the non-semi-coke component area S2 in the coal rock sample are counted by the counting method to calculate the semi-coke ratio S1 / (S1+S2) in the blended semi-coke coal.

7. A coking coal, comprising a blended semi-coke coal identified by the identification method according to any one of claims 1 to 6, wherein the mass fraction of the blended semi-coke coal in the coking coal satisfies at least one of the following: When the mass of the semi-coke in the blended semi-coke coal is not less than 20% of the total mass of the blended semi-coke coal, the mass fraction of the blended semi-coke coal in the coking coal is not greater than 5%; When the mass of the lignite in the blended lignite coal is less than 20% of the total mass of the blended lignite coal, the mass fraction of the blended lignite coal in the coking coal is not limited.

8. The coking coal according to claim 7, wherein the components of the coking coal include, by mass fraction: Main coking coal: 50%-60%, fat coal: 10%-13%, 1 / 3 coking coal: 13%-15%, gas coal: 10%-12%, lean coal: 6%-7%, the blended semi-coke coal: ≤5%.

9. A coking method comprising the following steps: The coking coal is prepared according to the components and corresponding mass fractions of claim 7 or 8; Under set coking conditions, coking the coking coal to obtain coke; Wherein, the set coking conditions include the following parameters: coking temperature is 1150°C to 1250°C, and coking time is 19h to 24h.

10. The method according to claim 9, wherein the coke comprises at least one of the following parameters: compressive strength ≥ 89 MPa, abrasion resistance ≤ 5.5%, coke reactivity ≤ 22.0% and post-reaction strength ≥ 66%.

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