Coal quality evaluating method and distributing method of highly-metamorphic coking coal based on coke optical texture structure

Abstract

The invention discloses a coal quality evaluating method and a distributing method of highly-metamorphic coking coal based on a coke optical texture structure. According to the coal quality evaluating method, according to the sum of a coarse grain embedding structure with an optical homochromatic region size of 7-10 micrometers of the highly-metamorphic coking coal and an incomplete fiber structure and the difference of sums of a medium-grain embedding structure, a coarse-grain embedding structure and the incomplete fiber structure, the highly-metamorphic coking coal is respectively evaluated as high-quality coking coal, common coking coal and inferior coking coal. According to the difference of the coal quality of the metamorphic coking coal, different distributing methods are provided. Coal is distributed according to the evaluating method of the invention, the distribution amount of gas coal can be correspondingly increased or reduced according to the difference of coal quality of the highly-metamorphic coking coal, and thus the coal distributing cost and the coking coal quality are effectively taken into account.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and coking, and in particular relates to a coal quality evaluation and matching method of high metamorphic coking coal based on coke optical structure. Background technique [0002] Volatile content V of coking coal commonly used in coking coal daf Between 18 and 28%, the average maximum reflectance of vitrinite Between 1.15 and 1.50%. in The coking coal with a concentration of 1.35-1.50% is called high-metamorphic coking coal. The cohesive index G value of this type of high-metamorphic coking coal is generally between 75-90, the colloidal layer index Y value is generally between 14-20mm, and the solid-soft temperature The range is generally between 50-75°C, the maximum Gibbs fluidity is between 10-500ddpm, and the content of coarse-grained mosaic components is between 38-78%. According to the traditional coal quality evaluation method, the higher the cohesion index G value, colloid layer...

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Problems solved by technology

According to the traditional coal quality evaluation method, the coking coal of the Saaji mine in Australia has a G value of 75, a Y value of 16mm, a solid-soft temperature range of 51°C, a maximum Gibbs fluidity of 19ddpm, and a coarse-grained mosaic component content of 40%, which is evaluated as inferior coking coal. However, the inventors have found that the thermal strength of coke making coke reaches more than 66% when the blending ratio is 18%, which is higher than the G value of 87, the Y value of 20mm, the solid-soft temperature range of 73°C, and the maximum Gibbs fluidity of 326ddpm in the Liulin area of ​​Shanxi. Coking coal with 78% coarse-grain mosaic component content can be used as high-quality coking coal. If it is mistakenly used as low-quality coking coal, precious coking coal resources will be wasted

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