Application of coal petrology method in abnormal coking coal quality assessment
The reflectance distribution and micro-component analysis in coal petrography can reveal the quality char-acteristics of coal.However,as the quality of coking coal resources deteriorates,it is necessary to use coal petrogra-phy to identify abnormal coking coal and evaluate its quality.By using an automatic coal reflectance testing system,coking coal resources are analyzed.Combined with the reflectance distribution and the petrographic standards for com-mercial coal,it is possible to determine whether the blended coal in coke production is a mix of similar types of co-king coal,a mix with low-quality coking coal,or a mix with non-coking coal.The study also explores the identifica-tion of abnormal coal through the examination of coal oxidation,the mixing of blue carbon,or industrial waste,based on the micro-components of the coal.The research indicates that coal reflectance is mainly used to identify mixed coals,and it is important to differentiate the similar type mixed coals,coal mixed with low-quality coking coal,and coal mixed with non-coking coal,especially avoiding the inclusion of non-coking coal.The microscopic composition of coal petrography is a supplement to the automatic measurement system of coal rock reflectance,observ-ing microscopic components through coal petrography can help identify the main reasons for abnormalities in coking coal,such as oxidation,mixing with blue carbon,or industrial waste.Coal petrography is a main technical method for identifying abnormal coking coal,however,coal petrography indicators only have a supplementary effect on tradi-tional indicators rather than a complete replacement effect.
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