Development of method for coal dust particle size distribution characterization by laser diffraction

Currently, an urgent environmental problem is the emission of coal dust during the extraction, storage, transportation of coal, as well as at the transshipment at coals terminals and in seaports. The fine coal dust with a particles sizes of less than 10 microns are of the highest interest due to its capability of being suspended for a long time and transported with air flows over considerable distances. In order to control the technological processes of mining, benefication, processing, transportation of coals as well as the assessment of the environmental status, the reliable information is needed not only on the content of fine coal dust in coals, but also on its particle size distribution. Today, the laser diffraction method is one of the most popular and reliable methods for determining the particle size distribution of finely dispersed materials. This article presents an approach to the development of a technique for measuring the particle size distribution of coal dust by laser diffraction. The issues of preparation of samples for analysis are considered, experimental results of studies of the influence of test conditions on the results of measurements of the particle size distribution of dust are presented. Based on the results obtained, a technique was developed for measuring the particle size distribution of finely dispersed coal dust. It includes methods for preparing the analytical samples, selection of the optimal measurement mode, measurement results, analysis of the results and their metrological assessment. It is shown that the developed technique can be used to assess the grain size distribution of coal dusts of different origin (sampled from various surfaces, isolated from suspensions, sampled from a mine or air atmosphere, from dust-extracting devices).

Keywords: fine coal dust, grain-size analysis, laser diffraction, sieve analysis, size grade, particle size, particle size distribution, method of determination.
For citation:

Krasilova V. A., Epshtein S. A., Kossovich E. L., Kozyrev M. M., Ionin A. A. Development of method for coal dust particle size distribution characterization by laser diffraction. MIAB. Mining Inf. Anal. Bull. 2022;(2):5-16. [In Russ]. DOI: 10.25018/0236_1493_2022_2_0_5.

Acknowledgements:

The work was supported by the Russian Science Foundation, Grant No. 18-77-10052-P.

Issue number: 2
Year: 2022
Page number: 5-16
ISBN: 0236-1493
UDK: 531+620.17
DOI: 10.25018/0236_1493_2022_2_0_5
Article receipt date: 22.11.2021
Date of review receipt: 24.12.2021
Date of the editorial board′s decision on the article′s publishing: 10.01.2022
About authors:

V.A. Krasilova1, Graduate Student, Engineer,
S.A. Epshtein1, Dr. Sci. (Eng.), Senior Researcher, Head of Laboratory, e-mail: apshtein@yandex.ru,
E.L. Kossovich1, Cand. Sci. (Phys. Mathem.), Senior Researcher, e-mail: e.kossovich@misis.ru,
M.M. Kozyrev, Student, National University of Science and Technology «MISiS», 119049, Moscow, Russia,
A.A. Ionin1, Trainee,
1 Scientific and Educational Testing Laboratory «Physics and Chemistry of Coals», National University of Science and Technology «MISiS», 119049, Moscow, Russia.

 

For contacts:

S.A. Epshtein, e-mail: apshtein@yandex.ru.

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