Authors: A.N. Zaostrovsky

Title of the article: Petrographic composition as a parameter characterizing the properties of coking coals

Year: 2023, Issue: 3, Pages: 60-69

Branch of knowledge: 2.6.12. Chemical technology of fuel and high-energy substances

Index UDK: 662.741

DOI: 10.26730/1999-4125-2023-3-60-69

Abstract: Petrographic analysis of coals and charges was performed in the reflectogram mode. It is shown that reflectograms are an effective means of quality control of coals supplied for coking, and changing their shape makes it possible to predict possible changes in the production process when using various charges. The reflectogram analysis of coking coals in combination with petrographic indicators and taking into account the petrographic heterogeneity of Kuznetsk coals, allows for the most accurate determination of their properties when composing coal charges, i.e., contributes to the choice of the direction of charging, which ensures the rational use of coal concentrates. This is especially important when concentrates are represented by coals of several brands or types having similar quality indicators, but with different sintering properties. The dependence of the free swelling index on the reflectivity of vitrinite is established. The highest values of the SI index are characteristic of coals with the lowest vitrinite reflection index. An increase in the swelling and, consequently, a decrease in the gas permeability of the plastic mass with an increase in the content of vitrinite in the coals is apparently explained by a decrease in the viscosity of the plastic mass as a result of the formation of an additional amount of liquid products. When the plastic mass is expanded, the contact between the coal grains improves, which contributes to their better sintering.

Key words: Сoal petrographic analysis of coal vitrinite reflection index reflectogram charge free swelling index sinterability coking coal

Receiving date: 01.06.2023

Approval date: 15.06.2023

Publication date: 30.06.2023

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