Coking coal blending method using weakly-caking coking coal

Abstract

The invention discloses a coking coal blending method using weakly-caking coking coal. In the method, the proportion of the coking coarse-grain mosaic texture of the blended coal is used as a control index; and by adjusting the dosage of the coking coal 1#, coking coal 2#, fat coal and 1 / 3 coking coal in the blended coal and mixing the coking coals to obtain the blended coal, the dosage of the weakly caking coal is increased, the coal resources are reasonably used, and the coal blending cost is remarkably reduced, wherein in the coking coal 1#, the proportion of the coking coarse-grain mosaic texture is greater than 60%; in the coking coal 2#, the proportion of the coking coarse-grain mosaic texture is less than 60%; in the fat coal, the caking index G is greater than 85, the proportion of the dry-ash-free volatile component Vdaf is less than 32%, and the maximum thickness Y of a gelatinous layer is greater than 25mm; and in the 1 / 3 coking coal, the caking index G is greater than or equal to 85, and the proportion of the coking coarse-grain mosaic texture is greater than 40%. Moreover, without the coal moisture control and briquetting technology and the pre-crushing technique, the CSR of the coke smelted by a coke oven higher than 60m is greater than 63%.

Description

technical field [0001] The invention belongs to the technical field of coking coal blending, and in particular relates to a coking coal blending method, in particular to a coking coal blending method involving weak caking coking coal. Background technique [0002] Both gas coal and lean coal belong to coking coal with weak caking property. Gas coal is a kind of coking coal with low degree of metamorphism and high volatile content, which has weak cohesiveness and poor colloid stability; lean coal is a kind of coking coal with high degree of metamorphism, low volatile content and weak cohesion Coal; in coal blending and coking, rapid coking plays the central role of coking. The optical structure of coke formed by gas coal alone is mainly isotropic structure and inert structure, and the coke formed by lean coal alone is mainly fiber, flake and inert structure. Although the two structural characteristics are different, the quality of coke has different deteriorating effect. T...

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Problems solved by technology

Therefore, although the two coking coals obtained by coking alone have large coke lumps and few cracks, their wear resistance is poor. Therefore, in coal blending coking, the amount of weakly caking coal is generally controlled in a low range, resulting in blending. Coal cost has been maintained at a high level

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