Coking coal blending method using high-expansion coking coal

Abstract

The invention discloses a coking coal blending method using high-expansion coking coal. In the method, the Aoya expansion degree b, the caking index G and the proportion of the coking coarse-grain mosaic texture in the blended coal are used as control indexes; and by increasing the dosage of the weakly-caking gas coal and lean coal, limiting the dosage of fat coal and mixing with the high-expansion coking coal, gas fat coal, 1 / 3 coking coal, coking coal 1# and coking coal 2# to prepare the blended coal, the coking coal 1# can be partially replaced by the high-expansion coking coal, and the coal blending cost is remarkably reduced, wherein in the high-expansion coking coal, the caking index G is greater than or equal to 85, the maximum thickness Y of the gelatinous layer is 18-23mm, the proportion of the dry-ash-free volatile component Vdaf is 23-25%, the maximum Gieseler fluidity lgMF is 3-4, the Aoya expansion degree b is greater than 80%, and the proportion of the single coal coking coarse-grain mosaic texture is greater than 60%; in the coking coal 1#, the proportion of the coking coarse-grain mosaic texture is greater than 60%, and the Aoya expansion degree b is less than 60%; and in the coking coal 2#, the proportion of the coking coarse-grain mosaic texture is less than 60%. Moreover, without the technological conditions of graded breaking, coal moisture control, briquetting technology, tamping coking and the like, the CSR of the coke smelted by a coke oven higher than 6m 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 method for coking coal blending. Background technique [0002] Coking coal is the main support for the quality of coke, and the quality of coking coal has a great influence on the quality of coke. At present, the coking coal of coking enterprises is evaluated and selected according to the G value of the cohesive index, the Y value of the maximum thickness of the colloidal layer, and the reflectance of the vitrinite group. In practical applications, it often happens that the coking coal that meets the requirements of high-quality coking coal in various conventional indicators is used for coal blending and coking, but the quality of the produced coke is inferior. For example, Guizhou coking coal has a volatile fraction of 23-25%, a Y value of 18-23mm, a G value of ≥85, and a value of Auya expansion degree b of more than 80% (conventional coking coal Auya...

AI Technical Summary

Problems solved by technology

Use conventional high-quality coking coal without adjusting the proportion of other coal types. The expansion of the mixed coal is too high, the coke produced is loose and not dense, and the hot and cold strength of coke is reduced.

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