Authors: S.A. Semenova, Yu.F. Patrakov

Title of the article: Estimation of the dispersed composition of an analytical coal sample by laser diffraction analysis

Year: 2022, Issue: 1, Pages: 64-73

Branch of knowledge: 2.8.9. Mineral processing

Index UDK: 61.53.03

DOI: 10.26730/1999-4125-2022-1-64-73

Abstract: The article describes the results of a study of the dispersed composition of particles in an analytical coal sample with a fraction < 200 µm obtained in laboratory conditions by manual grinding in a mortar. Samples of coals from the Kuzbass deposits of various stages of metamorphism and petrographic composition were used as objects of research. The study of the dispersed composition of the analytical sample of coals was carried out using a laser diffraction microanalyzer for automatic granulometric express analysis. The parameters of the dispersed composition of the sample are the average size of coal particles, the particle size distribution, the distribution density, the arithmetic mean diameter, the median, the magnitude and intensity of the modal values. Based on the results of the work, the influence of the distribution of petrographic components in the coal mass and the stage of metamorphism on the strength characteristics of coals and the fractional composition of the analytical sample is justified. It is shown that low-metamorphosed bright coals, along with highly metamorphosed ones, form an increased number of large particles (100-150 µm) under impact and abrasion. Medium-metamorphosed semi-dull coals form a larger amount of fine dust (< 50 µm) when crushed. Dull durain coals are more resistant to mechanical stress. The results obtained can be used to improve the technologies of coal mining, processing and processing associated with dust formation.

Key words: coal analytical sample granulometric laser analysis dispersed composition metamorphism stage petrographic composition

Receiving date: 22.12.2021

Approval date: 30.01.2022

Publication date: 25.02.2022

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