Authors: N.I. Fedorova, N.A. Grabovaya, Z.R. Ismagilov
Title of the article: Petrographic analysis of brown coals
Year: 2019, Issue: 4, Pages: 70-76
Branch of knowledge: 05.17.07 Chemical technology of fuel and high-energy substances
Index UDK: 662.741.3.022.001.5
DOI: 10.26730/1999-4125-2019-4-70-76
Abstract: Fossil coals are a complex composition system consisting of organic microcomponents in the form of macerals and mineral inclusions. The relevance of the work is determined by the fact that for the forecast of technological properties and the choice of the main areas of industrial use of coal, data on their petrographic composition are very important, since the maceral composition of coal is one of the parameters of coals classification and codification. Brown coals of the following deposits were used as objects of research: Itatsky, Munai, Arkharo-Boguchansky, Kangalassky, and Baganuur (Mongolia). The investigated samples are characterized by technical and elemental methods of analysis. It is established that the ash content of brown coals is less than 10%, the yield of volatile substances varies from 41% to 48%. The index of vitrinite (Ro,r) was determined by the method of petrographic analysis for the studied coal. It has been established that the sample of brown coal from the Itatsky deposit (Ro,r = 0.388%) has the smallest indicator of vitrinite reflection, the brown coal from the Kangalassky deposit (Ro,r = 0.490%) is characterized by the maximum value. An increase in the genetic maturity of the studied samples is associated with a change in the technological properties of their organic mass. It is shown that with an increase in Ro,r, the carbon content (Сdaf)) increases, the yield of volatile substances decreases, as well as the atomic ratio Н/С and О/С. A visual analysis of the polished sections made it possible to determine the maceral composition of the coal under study. The sample of brown coal from the Baganuurskoye deposit (Mongolia) revealed the highest content of inertinite (more than 60%); the sample of the Kangalasskoye deposit contains the largest amount of macerals of the vitrinite group (86%).
Key words: brown coals petrographic analysis vitrinite reflection index coal macerals inertinite
Receiving date: 01.07.2019
Approval date: 01.01.1970
Publication date: 19.12.2019
This work is licensed under a Creative Commons Attribution 4.0 License.
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