Coke making method by using low-volatile coking coal in coal blending

Abstract

The invention discloses a coke making method by using low-volatile coking coal in coal blending, which comprises the following steps: 1) coke microstructure testing: carrying out single-coal coking on the low-volatile coking coal, and carrying out microstructure testing on the obtained coke; 2) single-coal coking thermal performance testing: respectively obtaining the strengths of the reference coking coal (of which the volatile content is 21-24%, the single-coal coking coarse grain mosaic structure is greater than or equal to 65%, the G value is greater than 85 and the solid softening temperature range is up to 85 DEG C above) and low-volatile coking coal subjected to coke thermal reaction, and comparing; and 3) carrying out classified blending on the low-volatile coking coal according to the coke microstructure characteristics and the single-coal coking thermal properties. The low-volatile coking coal is reasonably divided and subjected to classified blending according to the coke microstructure characteristics and the single-coal coking thermal properties; and thus, the method can effectively utilize the low-volatile coking coal resources under the technological conditions of no graded crushing, briquette technique or tamping coking, the coke quality does not deteriorate, and the CSR of the coke made by the 6m-above coke oven is greater than 65%.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a coking method for low-volatile coking coal participating in coal blending. Background technique [0002] According to the Chinese coal classification standard (GB 5751-2009), the volatile content of coking coal is >10.0-28.0%, the G value is >65, and the Y value is ≤25.0mm. With the development of refined coal blending technology, coking enterprises have gradually realized that the quality of coking coal with different volatiles, G values ​​and Y values ​​is quite different. At about 20%, coking coal with a G value of 80 or more is also introduced at a high price by some large steel mills. However, in the practice of coal blending, it is found that there may be large differences in the quality of coking coal with the same volatile content and the same G value at different mine sites. For example, WISCO introduced a batch of coking coal with low...

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Problems solved by technology

For example, WISCO introduced a batch of coking coal with lower volatile content from the United States and Australia, and the volatile content (V daf ) ranges from 17% to 21%, and the G value is ≥80. In actual use, although the coking coals of these two ore spots have the same high degree of metamorphism, and the coking microstructure has a certain fibrous structure, the performance of the coke obtained by coking is relatively low. big difference

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