Coking coal blending method of improving homogeneity coefficient of coke size

Abstract

The invention discloses a coking coal blending method of improving homogeneity coefficient of coke size. The method comprises the following steps: determining the average maximum reflectivity, the solid-soft temperature interval region, the Gieseler fluidity and the coking optical organization structure of a single coal vitrinite; according to a test result, selecting the type of coal in percentage by weight of 15-18%, wherein formula is greater than or equal to 2.0% and the coking optical organization structure is 100% an inertial component; smashing till the part with particle size less than or equal to 0.4mm is over 90%; 2) selecting the type of coal in percentage by weight of 30-40%, wherein formula is 0.6-1.1%, the solid-soft temperature interval region is greater than 95 DEG C, the maximum Gieseler fluidity log value logMF is greater than 4 and the inertial component of the coking optical organization structure is less than or equal to 25%; 3) selecting the type of coal in percentage by weight of 20-40%, wherein formula is 1.1-2.0% and the granular inlay component of the coking optical organization structure is greater than or equal to 60%; and 4) selecting the type of coal in percentage by weight of 20-60%, wherein formula is 1.1-2.0% and the granular inlay component of the coking optical organization structure is greater 20-60%, and blending coal according to a certain proportional range. According to the coal blending method disclosed by the invention, the coke is uniform in grain size, high in cold and heat state strengths and low in coal blending cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and coking, and in particular relates to a coking coal blending method for improving the uniform coefficient of coke particle size. Background technique [0002] Coke plays the role of heat source, reducing agent, carburizing agent and material column skeleton in the blast furnace. In the blast furnace, coke and ore are bulk materials with irregular shape and non-uniform particle size. The air permeability of the bulk material layer is related to the uniformity of the bulk material particle size. As the uniformity of the bulk material particle size increases, the void ratio of the bulk material layer increases. , the air resistance coefficient of the material layer is reduced, and the air permeability of the material column is improved, which helps the development of indirect reduction. [0003] The shrinkage X value of gas coal, fat coal, 1 / 3 coking coal, coking coal and lean coal for coking ...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a coking coal blending method that improves the uniformity coefficient of coke particle size, so as to overcome the defect of low uniformity coefficient of coke particle size obtained by the traditional coal blending coking method, and contribute to the development of blast furnace indirect reduction

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