Coking method of stamping and solidifying coal blending mainly with 1 / 3 coking coal

Abstract

The present application relates to a kind of 1 / 3 coke coal-based stamping coal blending coking method.The method comprises the following steps: 1).mixing each single coking coal, the single coking coal and its weight percentage are as follows: gas coal 5% to 10%, high-quality 1 / 3 coke coal 30% to 40%, ordinary 1 / 3 coke coal 25% to 30%, gas fat coal 7% to 15%, lean coal 15% to 25%;2).pre-pulverizing gas coal, gas fat coal and 1 / 3 coke coal respectively, the proportion of less than 3mm after pre-pulverizing reaches 80% to 85%;then pulverizing the mixed coal, the proportion of less than 3mm after pulverizing is 86% to 88% and the proportion of less than 0.5mm is less than 48%;and 3).stamping, production on stamping coke oven.The method of the present application can greatly reduce the application of coking coal and fat coal, reduce the consumption of scarce coal, thereby reduce the cost of coke raw materials.

Description

Technical Field

[0001] This invention belongs to the field of coking coal blending in the coking industry, specifically involving a method for coking with 1 / 3 coking coal as the main component and tamping the coal. Background Technology

[0002] Although my country has abundant coal resources, it lacks high-quality coking coal resources such as coking coal and fat coal, while resources of weakly caking coal, gas coal, and 1 / 3 coking coal are relatively abundant. On the one hand, my country's coking production capacity is huge, consuming coking coal resources too quickly; on the other hand, the increasing size of blast furnaces places higher demands on coke quality, leading to a continuous increase in the proportion of coking coal and fat coal in the coal blending structure to improve coke strength. Excessive consumption of high-quality coking coal resources significantly increases coke raw material costs, reduces profits, and decreases competitiveness. To reduce and slow down the consumption of coking coal and fat coal, meet the needs of long-term development, and simultaneously lower coke raw material costs and increase coke profits, it is necessary to expand the utilization rate of relatively abundant coal resources such as weakly caking coal, gas coal, and 1 / 3 coking coal. In particular, 1 / 3 coking coal is distributed in various provinces in my country, including Jiangsu, Shandong, Shanxi, Heilongjiang, and Inner Mongolia Autonomous Region, and is inexpensive with low ash and sulfur content. Increasing the use of 1 / 3 coking coal can effectively alleviate the consumption of high-quality coking coal and reduce coke costs.

[0003] For example, patent CN 104830360 B discloses a method for blending 1 / 3 coking coal with a volatile matter content of 34% or higher. The blending scheme of this method is as follows: The Kiel fluidity of the 1 / 3 coking coal is measured. The 1 / 3 coking coal with a solid-softening temperature range <70℃ is designated as Class II 1 / 3 coking coal, and the 1 / 3 coking coal with a solid-softening temperature range >85℃ is designated as other 1 / 3 coking coal. The Class II 1 / 3 coking coal is then blended according to the following mass percentages: gas-rich coal: 1-10%, fat coal: 1-15%, Class II 1 / 3 coking coal: 5-10%, other 1 / 3 coking coal: 10-20%, coking coal: 40-45%, lean coal: 10-15%. This invention optimizes and subdivides the 1 / 3 coking coal using the solid-softening temperature range in the Kiel fluidity index, and supplements it with a suitable blending structure, which can achieve the purpose of stabilizing coke quality. Patent application CN 111286380 A discloses a method for blending high-sulfur 1 / 3 coking coal into compacted coking coal. This method incorporates 19%–35% high-sulfur 1 / 3 coking coal into conventional blending schemes, reducing blending costs and conserving coking coal resources while ensuring coke quality. Patent application CN 101870875 B provides a method for producing metallurgical coke using 1 / 3 coking coal and non-coking coal. This method involves blending 1 / 3 coking coal and non-coking coal into a coking blend with an ash content ≤10%, sulfur content ≤0.9%, volatile matter content ≤32.0%, and caking index ≥65. The resulting GB grade II metallurgical coke is produced using a compacted coking process, achieving comprehensive utilization and conversion of local coal resources and enhancing their economic value.

[0004] Although the above technologies are applied to 1 / 3 coking coal, they do not fully utilize the 1 / 3 coking coal resources and have limited effect on reducing coke costs. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a method for coking with a high proportion of 1 / 3 coking coal. This method achieves the application of 1 / 3 coking coal while ensuring superior coke quality, thereby reducing the original cost of coke and saving high-quality and scarce coking coal resources.

[0006] To achieve the above objectives,

[0007] This invention provides a method for coking with blended coal, the method comprising the following steps:

[0008] 1. The various types of coking coal are blended, and the individual types of coking coal and their weight percentages are as follows: gas coal 5%~10%, high-quality 1 / 3 coking coal 30%~40%, ordinary 1 / 3 coking coal 25%~30%, gas-rich coal 7%~15%, and lean coal 15%~25%, of which 1 / 3 coking coal accounts for 60%~70% in total, and all individual types of coking coal account for 100% in total;

[0009] 2. Gas coal, gas-rich coal, and 1 / 3 coking coal are pre-crushed separately, with 80%–85% of the material being smaller than 3mm after pre-crushing; then the blended coal is further crushed, with 86%–88% of the material being smaller than 3mm and less than 48% being smaller than 0.5mm; and

[0010] 3. Perform compaction, controlling the compaction density to 1.0~1.1 t / m³. 3 It is produced in a tamping coke oven with a coking time of 26 to 28 hours. The standard coke oven temperature is 1340 to 1355℃, and dry quenching is used.

[0011] In a specific implementation, the gas coal, 1 / 3 coking coal, gas-rich coal, and lean coal are defined according to the classification standard of bituminous coal in GB / T 5751-2009 "Classification of Coal in China".

[0012] In this article, the volatile matter V of high-quality 1 / 3 coking coal daf >28%~35%, the proportion of vitrinite reflectance in the range of 0.65-0.85 reaches more than 80%, the caking index G value ≥80, and the hot strength CSR of coke produced by a 40kg small coke oven alone is ≥45%; ordinary 1 / 3 coking coal is other 1 / 3 coking coal that does not meet the above requirements.

[0013] In a specific embodiment, the proportion of the gas coal with a vitrinite reflectance range of 0.65-0.85 reaches more than 80%, the caking index G value is ≥75, and the hot coke strength CSR of 40kg small coke oven coking alone is ≥35%.

[0014] In a specific embodiment, the volatile matter V of the gas-rich coal daf >37%, vitrinite reflectance range of 0.65-0.85 accounts for more than 80%, adhesion index G value ≥90, hot coke strength CSR ≥35% for 40kg small coke oven coking alone, sulfur content S t，d >2.5%~4.0%.

[0015] In a specific embodiment, the volatile matter V of the lean coal daf <20%, adhesion index G value >10~20.

[0016] In a specific implementation, in step 1, the quality indicators of the blended coal obtained after blending each type of coking coal meet the following requirements: volatile matter V daf The content is 30%–33%, sulfur content ≤0.85%, ash content ≤10%, and the bonding index G value ≥66.

[0017] In a specific implementation, in step 1, the individual types of coking coal and their proportions are as follows:

[0018] 10% gas coal, 35% high-quality 1 / 3 coking coal, 25% ordinary 1 / 3 coking coal, 12% gas-rich coal, and 18% lean coal; or

[0019] Gas coal 5%, high-quality 1 / 3 coking coal 38%, ordinary 1 / 3 coking coal 25%, gas-rich coal 12%, lean coal 20%; or

[0020] 10% gas coal, 32% high-quality 1 / 3 coking coal, 28% ordinary 1 / 3 coking coal, 12% gas-rich coal, and 18% lean coal; or

[0021] 5% gas coal, 40% high-quality 1 / 3 coking coal, 30% ordinary 1 / 3 coking coal, 7% gas-rich coal, and 18% lean coal.

[0022] In a specific embodiment, the metallurgical coke obtained by the method meets the following quality indicators: sulfur content ≤ 0.70%, ash content ≤ 13%, and crush resistance M. 25 ≥90%, abrasion resistance M 10 ≤8%, Reactivity CRI≤30%, Post-reaction strength CSR≥60%.

[0023] This invention blends 1 / 3 coking coal of different qualities, using gas-rich coal to replace coking coal to maintain the required caking and flowability of the blended coal, and using high-quality 1 / 3 coking coal to replace coking coal to ensure the required coking properties and strength of the blended coal. Through a compaction process, the coking time is appropriately extended and the standard temperature is increased, achieving a 1 / 3 coking coal blending ratio of 60%~75%. The resulting high-quality metallurgical coke meets the following quality indicators: sulfur content ≤0.70%, ash content ≤13%, and crushing strength M... 25 ≥90%, abrasion resistance M 10 ≤8%, reactivity CRI ≤30%, post-reaction strength CSR ≥60%, meeting 1500m 3 And for use in blast furnaces.

[0024] Compared with existing technologies:

[0025] This invention enables the use of 1 / 3 coking coal in a high proportion, which is 30% to 40% higher than the industry average, making full use of 1 / 3 coking resources. At the same time, it can significantly reduce or even avoid the use of coking coal and fat coal, thus reducing the consumption of scarce coal types.

[0026] 1 / 3 coking coal is 300-500 yuan / ton cheaper than coking coal and fat coal. After increasing the cost of 1 / 3 coking coal by 30%-40%, the cost of coke raw materials can be significantly reduced. Attached Figure Description

[0027] Figure 1 Comparison of coke CSR (coke saturation) under tamping and non-tamping conditions, using a blend of 1 / 3 coking coal, coking coal, and lean coal.

[0028] Figure 2 A comparison chart of coke M25 produced by blending 1 / 3 coking coal, coking coal and lean coal, with and without tamping. Detailed Implementation

[0029] To fully investigate the application limits of 1 / 3 coking coal in compacted coke production, a blending experiment was conducted using 1 / 3 coking coal, coking coal, and lean coal. The 1 / 3 coking coal used was from Xingtai, Hebei Province; the coking coal used was from Fengfeng, Handan, Hebei Province; and the lean coal used was from Changzhi, Shanxi Province. The specifications are shown in Table 1. A 40kg small coke oven experiment was conducted according to the following scheme, as shown in Table 2. The quality of the coke produced after the experiment is shown in Table 3.

[0030] The 40kg small coke oven experiment was conducted according to YBT 4526-2016 "Technical Specification for Small Coke Ovens for Coking Experiments", with a coking time of 20 hours and a blended coal content of 86%–88% smaller than 3mm; the bulk density of the compaction process was controlled at 1.0–1.1 t / m³. 3 The bulk density of the non-tamping process is controlled at 0.75~0.78 t / m³. 3 .

[0031] Table 1 Quality Indicators of Three Types of Coal

[0032]

[0033] Table 2 Experimental Scheme

[0034]

[0035] Table 3 Experimental Results

[0036]

[0037] Table 3 shows that, under the same process conditions (tamping and non-tamping), as the proportion of 1 / 3 coking coal increases, the proportion of coking coal decreases, and the cold strength (M) of the coke decreases. 25 and M 10 The thermal strength (CRI and CSR) deteriorates. Figure 1 and Figure 2 It can be seen that, under the tamping process, schemes 3 and 4, which increase the proportion of coking coal by 1 / 3 to 60% and 70%, respectively, have lower cold coke strength (M). 25 and M 10 The thermal strength (CRI and CSR) remains comparable to those of schemes 5 and 6 under untamped conditions, with CSR reaching over 60%. 25 A concentration exceeding 90% indicates that the compaction process significantly enhances the role of 1 / 3 coking coal, enabling it to replace coking coal and exhibit better coking properties. The underlying principle is that the increased bulk density from the compaction process increases the resistance encountered by the gases released during pyrolysis of the 1 / 3 coking coal, delaying their residence time within the plastic mass. This allows free radical-containing atomic groups or intermediate products from thermal decomposition within the 1 / 3 coking coal to interact more effectively, thus overcoming the drawback of its high volatile matter content.

[0038] The present invention will now be described in further detail with reference to specific embodiments.

[0039] The individual coal types and their indicators selected in the following embodiments and comparative examples are shown in Table 4 below.

[0040] Table 4

[0041]

[0042] Example 1:

[0043] The individual coal types in Table 4 are blended according to the following weight percentages: gas coal 10%, high-quality 1 / 3 coking coal 35%, ordinary 1 / 3 coking coal 25%, gas-rich coal No. 1 12%, and lean coal No. 2 18%; the quality index of the blended coal is: volatile matter V daf It has a content of 32.5%, sulfur content of 0.82%, ash content of 9.76%, and a binding index (G value) of 68.

[0044] Then, coal preparation and coking production are carried out, including: pre-crushing gas coal, gas-rich coal, and 1 / 3 coking coal separately, with 84% of the pre-crushed coal being smaller than 3mm; then crushing the blended coal, with 86% of the crushed coal being smaller than 3mm and 45% being smaller than 0.5mm; finally, compaction is carried out, with the compaction density controlled at 1.0 t / m³. 3 Production takes place in a tamping coke oven with a coking time of 26 hours. The standard coke oven temperature is 1340°C on the machine side and 1350°C on the coke side, and dry quenching is used.

[0045] The obtained metallurgical coke meets the following quality indicators: sulfur content 0.69%, ash content 12.9%, and crushing strength M. 25 The wear resistance is 91.8%, and the wear resistance M 10 The CRI was 6.5%, the CSR was 28.4%, and the CSR after reaction was 62.8%, which met the requirements.

[0046] Example 2:

[0047] The individual coal types in Table 4 are blended according to the following weight percentages: gas coal 5%, high-quality 1 / 3 coking coal 38%, ordinary 1 / 3 coking coal 25%, gas-rich coal No. 1 12%, and lean coal No. 2 20%; the quality index of the blended coal is: volatile matter V daf It has a content of 31.9%, sulfur content of 0.81%, ash content of 9.67%, and a binding index G value of 67.

[0048] Then, coal preparation and coking production are carried out, including: pre-crushing gas coal, gas-rich coal, and 1 / 3 coking coal, with 84% of the coal being smaller than 3mm after pre-crushing; then crushing the blended coal, with 87% of the coal being smaller than 3mm and 46% smaller than 0.5mm; finally, compaction is carried out, with the compaction density controlled at 1.03 t / m³. 3 Production takes place in a tamping coke oven with a coking time of 26 hours. The standard coke oven temperature is 1340°C on the machine side and 1350°C on the coke side, and dry quenching is used.

[0049] The obtained metallurgical coke meets the following quality indicators: sulfur content 0.68%, ash content 12.95%, and crushing strength M. 25 The wear resistance is 91.5%, and the abrasion resistance M 10 The CRI was 6.4%, the CSR was 27.1%, and the CSR after reaction was 62.9%, which met the requirements.

[0050] Example 3:

[0051] The individual coal types in Table 4 are blended according to the following weight percentages: gas coal 10%, high-quality 1 / 3 coking coal 32%, ordinary 1 / 3 coking coal 28%, gas-rich coal No. 1 12%, and lean coal No. 2 18%; the quality index of the blended coal is: volatile matter Vdaf It has a content of 32.7%, sulfur content of 0.83%, ash content of 9.61%, and a binding index G value of 69.

[0052] Then, coal preparation and coking production are carried out, including: pre-crushing gas coal, gas-rich coal, and 1 / 3 coking coal separately, with 84% of the pre-crushed coal being smaller than 3mm; then crushing the blended coal, with 88% of the crushed coal being smaller than 3mm and 45% being smaller than 0.5mm; finally, compaction is carried out, with the compaction density controlled at 1.03 t / m³. 3 Production takes place in a tamping coke oven with a coking time of 26 hours. The standard coke oven temperature is 1340°C on the machine side and 1350°C on the coke side, and dry quenching is used.

[0053] The obtained metallurgical coke meets the following quality indicators: sulfur content 0.70%, ash content 12.98%, and crushing strength M. 25 The wear resistance is 91.0%, and the abrasion resistance M 10 The CRI was 6.8%, the CSR was 26.8%, and the CSR after reaction was 63.2%, which met the requirements.

[0054] Example 4:

[0055] The individual coal types in Table 4 are blended according to the following weight percentages: gas coal 5%, high-quality 1 / 3 coking coal 40%, ordinary 1 / 3 coking coal 30%, gas-rich coal No. 1 7%, and lean coal No. 1 18%; the quality index of the blended coal is: volatile matter V daf It has a content of 32.8%, sulfur content of 0.84%, ash content of 9.74%, and a binding index G value of 67.

[0056] Then, coal preparation and coking production are carried out, including: pre-crushing gas coal, gas-rich coal, and 1 / 3 coking coal separately, with 85% of the pre-crushed coal being smaller than 3mm; then crushing the blended coal, with 87% of the crushed coal being smaller than 3mm and 47% being smaller than 0.5mm; finally, compaction is carried out, with the compaction density controlled at 1.05t / m³. 3 Production takes place in a compacted coke oven with a coking time of 27 hours. The standard coke oven temperature is 1340°C on the machine side and 1350°C on the coke side. Dry quenching is used.

[0057] The obtained metallurgical coke meets the following quality indicators: sulfur content 0.70%, ash content 12.95%, and crushing strength M. 25 The wear resistance is 90.5%, and the abrasion resistance M 10 The CRI was 6.8%, the CSR was 28.8%, and the CSR after reaction was 61.2%, which met the requirements.

[0058] Comparative Example 1:

[0059] The individual coal types in Table 4 are blended according to the following weight percentages: gas coal 5%, high-quality 1 / 3 coking coal 40%, ordinary 1 / 3 coking coal 35%, gas-rich coal No. 1 7%, and lean coal No. 1 13%; the quality index of the blended coal is: volatile matter V daf It has a content of 34.1%, sulfur content of 0.80%, ash content of 9.74%, and a binding index G value of 71.

[0060] Then, coal preparation and coking production are carried out, including: pre-crushing gas coal, gas-rich coal, and 1 / 3 coking coal separately, with 85% of the pre-crushed coal being smaller than 3mm; then crushing the blended coal, with 87% of the crushed coal being smaller than 3mm and 47% being smaller than 0.5mm; finally, compaction is carried out, with the compaction density controlled at 1.05t / m³. 3 Production takes place in a compacted coke oven with a coking time of 27 hours. The standard coke oven temperature is 1340°C on the machine side and 1350°C on the coke side. Dry quenching is used.

[0061] The obtained metallurgical coke met the following quality indicators: sulfur content 0.66%, ash content 12.92%, and crushing strength M. 25 The wear resistance is 88.5%, and the wear resistance M 10 The coke content was 8.1%, the reactivity CRI was 31.6%, and the post-reaction strength CSR was 58.5%, which did not meet the coke quality requirements.

[0062] The difference between Comparative Example 1 and Example 4 is that the total proportion of 1 / 3 coking coal exceeds 70%, which is beyond the limit of 1 / 3 coking coal proportion. The proportion of lean coal is too low, which makes the overall coal blending structure unbalanced. As a result, the volatile matter of the blended coal rises to more than 34%, the coking properties decrease, the coke porosity increases, and the strength decreases significantly, which does not meet the requirements.

[0063] Comparative Example 2:

[0064] The individual coal types in Table 4 are blended according to the following weight percentages: gas coal 10%, high-quality 1 / 3 coking coal 20%, ordinary 1 / 3 coking coal 40%, gas-rich coal No. 1 12%, and lean coal No. 2 18%; the quality index of the blended coal is: volatile matter V daf It has a content of 33.2%, sulfur content of 0.84%, ash content of 9.81%, and a binding index (G value) of 64;

[0065] Then, coal preparation and coking production are carried out, including: pre-crushing gas coal, gas-rich coal, and 1 / 3 coking coal separately, with 84.5% of the pre-crushed coal being smaller than 3mm; then crushing the blended coal, with 86% of the crushed coal being smaller than 3mm and 45% being smaller than 0.5mm; finally, compaction is carried out, with the compaction density controlled at 1.04 t / m³. 3 Production takes place in a tamping coke oven with a coking time of 26 hours. The standard coke oven temperature is 1340°C on the machine side and 1350°C on the coke side, and dry quenching is used.

[0066] The obtained metallurgical coke meets the following quality indicators: sulfur content 0.71%, ash content 13.2%, and crushing strength M. 25 The wear resistance is 89.8%, and the wear resistance M 10 The coke quality index (CRI) was 7.7%, the reactivity index (CRI) was 31.7%, and the post-reaction strength (CSR) was 59.2%, which did not meet the coke quality requirements.

[0067] The difference between Comparative Example 2 and Example 1 is that the proportion of high-quality 1 / 3 coking coal is too low, while the proportion of ordinary 1 / 3 coking coal is too high, resulting in a lower caking index (G value) and lower volatile matter (V value) of the blended coal. daf If the concentration is greater than 33%, it does not meet the requirements for blended coal, resulting in a significant decrease in the coke's hot strength (CSR) and excessive ash sulfur content, thus failing to meet the requirements.

[0068] Comparative Example 3:

[0069] The individual coal types in Table 4 are blended according to the following weight percentages: gas coal 5%, high-quality 1 / 3 coking coal 38%, ordinary 1 / 3 coking coal 25%, gas-rich coal No. 1 12%, and lean coal No. 2 20%; the quality index of the blended coal is: volatile matter V daf It has a content of 31.9%, sulfur content of 0.81%, ash content of 9.67%, and a binding index G value of 67;

[0070] Then, coal preparation and compaction for coking production are carried out, including crushing the blended coal, with 84% of the crushed coal being smaller than 3mm and 46% being smaller than 0.5mm; followed by compaction, with the compaction density controlled at 1.03t / m³. 3 Production takes place in a tamping coke oven with a coking time of 25 hours. The standard coke oven temperature is 1345℃ on the machine side and 1355℃ on the coke side, and dry quenching is used.

[0071] The obtained metallurgical coke meets the following quality indicators: sulfur content 0.68%, ash content 12.93%, and crushing strength M. 25 The wear resistance is 89.2%, and the wear resistance M 10 The coke quality index (CRI) was 7.4%, the reactivity index (CRI) was 33.5%, and the post-reaction strength (CSR) was 57.2%, which did not meet the coke quality requirements.

[0072] The difference between Comparative Example 3 and Example 2 is that Comparative Example 3 did not pre-crush the gas coal, gas-rich coal, and 1 / 3 coking coal separately. The proportion of coal particles smaller than 3mm after crushing was 84%, which is low. The coking time was 25 hours, which is also low, and the production process indicators did not meet the requirements. The low proportion of particles smaller than 3mm indicates that the large particles of gas coal, gas-rich coal, and 1 / 3 coking coal were not sufficiently crushed, which will cause coke cracks and affect cold strength. The short coking time leads to insufficient coke maturation, resulting in an increase in CRI and a decrease in CSR, failing to meet the coke quality requirements.

Claims

1. A method for coking coal blending, the method comprising the following steps: 1) The various types of coking coal are blended, and the individual types of coking coal and their weight percentages are as follows: gas coal 5%~10%, high-quality 1 / 3 coking coal 30%~40%, ordinary 1 / 3 coking coal 25%~30%, gas-rich coal 7%~15%, and lean coal 15%~25%, of which 1 / 3 coking coal accounts for 60%~70% in total, and all individual types of coking coal account for 100% in total; The required index for the high-quality 1 / 3 coking coal is: volatile matter V daf >28%~35%, the proportion of vitrinite reflectance in the range of 0.65-0.85 reaches more than 80%, the caking index G value ≥80, and the hot strength CSR of coke produced by a 40kg small coke oven alone is ≥45%; the ordinary 1 / 3 coking coal mentioned above is other 1 / 3 coking coal that does not meet the above requirements; 2) Pre-crush gas coal, gas-rich coal, and 1 / 3 coking coal separately, ensuring that 80%–85% of the coal is smaller than 3mm after pre-crushing; then, further crush the blended coal, ensuring that 86%–88% of the coal is smaller than 3mm and less than 48% is smaller than 0.5mm; and 3) Perform compaction, controlling the compaction density to 1.0~1.1 t / m³. 3 It is produced on a tamping coke oven, with a coking time of 26 to 28 hours. The standard coke oven temperature is 1340 to 1355℃, and dry quenching is adopted.

2. The method according to claim 1, wherein, The proportion of the gas coal with a vitrinite reflectance range of 0.65-0.85 is over 80%, the caking index G value is ≥75, and the hot coke strength CSR of 40kg small coke oven coking alone is ≥35%.

3. The method according to claim 1, wherein, The volatile matter V of the gas-rich coal daf >37%, vitrinite reflectance range of 0.65-0.85 accounts for more than 80%, adhesion index G value ≥90, hot coke strength CSR ≥35% for 40kg small coke oven coking alone, sulfur content S t，d >2.5%~4.0%.

4. The method according to claim 1, wherein, The volatile matter V of the lean coal daf <20%, adhesion index G value >10~20.

5. The method according to claim 1, wherein, In step 1), the quality indicators of the blended coal obtained after blending each type of coking coal meet the following requirements: volatile matter V daf The content is 30%–33%, sulfur content ≤0.85%, ash content ≤10%, and the bonding index G value ≥66.

6. The method according to claim 1, wherein, In step 1), the individual coking coals and their proportions are as follows: 10% gas coal, 35% high-quality 1 / 3 coking coal, 25% ordinary 1 / 3 coking coal, 12% gas-rich coal, and 18% lean coal; or Gas coal 5%, high-quality 1 / 3 coking coal 38%, ordinary 1 / 3 coking coal 25%, gas-rich coal 12%, lean coal 20%; or 10% gas coal, 32% high-quality 1 / 3 coking coal, 28% ordinary 1 / 3 coking coal, 12% gas-rich coal, and 18% lean coal; or 5% gas coal, 40% high-quality 1 / 3 coking coal, 30% ordinary 1 / 3 coking coal, 7% gas-rich coal, and 18% lean coal.

7. The method according to claim 1, wherein, The metallurgical coke obtained by the method meets the following quality indicators: sulfur content ≤0.70%, ash content ≤13%, and crushing strength M. 25 ≥90%, abrasion resistance M 10 ≤8%, Reactivity CRI≤30%, Post-reaction strength CSR≥60%.

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