Abstract
The scientific article is devoted to the study of the structural content of coal fractions, which differ in density. The main attention is paid to the study of the chemical composition of ash dense fractions of weakly burned coal. This will extend the idea of coal ash. The publication presents a qualitative and quantitative analysis of the chemical composition of low-alumina coal, which was used to calculate the ash index of the main samples, which in turn allowed us to calculate a preliminary estimate of coke on the CRI reactivity and coke strength after the CSR reaction. From the presented results it turns out that the fraction with a density <1.25 g/cm3 and> 1.3 g/cm3 have the worst technological characteristics. Keywords: density fractions, basicity index, coal, ash, chemical composition, acidic oxides, reactivity.
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