A Coking Coal Blending Method with Medium and High Sulfur Coal Participation

Abstract

The invention provides a method for blending coking coal by using fat coal with medium and high sulfur content. The coking coal comprises the following components in percentages by weight: 8%-18% of 1 / 3 coking coal, 10%-20% of fat coal with medium and high sulfur content, 8%-29% of fat coal, 16%-35% of coking coal with coking index G greater than or equal to 78, 19%-36% of coking coal with coking index G greater than or equal to 75 and smaller than 78, and 8%-22% of lean coal. G value of the coking index of the coking coal is 80-85, Y value is 15-19 mm, and Std is 0.65%-1.15%. The coal properties of the fat coal with medium and high sulfur content are as follows: the mean maximum reflectance of vitrinite is 0.90%-1.10%, and volatiles are 26%-32%. Technological performance indexes are as follows: the G value of the coking index is greater than or equal to 86, the Y value of the thickness of a gel layer is greater than or equal to 20 mm, and Std is 1%-3%. The content of produced coke sulfur is below 1.0%, and reaches the level higher than the level of third-level coke, demands of coke using of a large blast furnace can be met completely, the purposes of fully utilizing the coal with medium and high sulfur and protecting high-quality coking coal resources are achieved, and coking cost can be reduced greatly.

Description

technical field [0001] The invention belongs to the technical field of metallurgical coke production, and in particular relates to a coking coal-rock coal blending method using medium- and high-sulfur fertile coal. Background technique [0002] With the increasing application proportion of large-scale blast furnaces, the demand for high-quality coke is also increasing. Therefore, it is required to mix a large amount of moderately metamorphic fat coal and coking coal in coal blending. According to the classification of coal types in my country, coking coal accounts for 27.65%, and non-coking coal accounts for 72.35%. Among coking coals, gas coal: 13.75%, fat coal: 3.53%, main coking coal: 5.81%, lean coal: 4.01%, and other unclassified coal: 0.55%. It can be seen that fat coal is the coal with the least reserves in coking coal in my country, and in the actual coking coal blending process, fat coal and coking coal are mainly used. Therefore, effective utilization of fat coal...

AI Technical Summary

Problems solved by technology

If medium- and high-sulfur fertile coals are simply replaced with other coals in coking coal blending, the vitrinite reflectance of the blended coal cannot be guaranteed to be continuous. At the same time, the sulfur content in the coke made exceeds the standard, which will lead to a decline in the quality of the coke, which cannot meet the needs of large-scale blast furnaces. Coke Quality Requirements