Petrographic and Electron-Microscopic Studies
of the Oxidation and Mineral Impurities of Coal

V. I. Vyalov^a, M. I. Gamov^b, and S. A. Epshtein^c

^a Karpinskii All-Russia Research Institute of Geology,

Srednii pr. 74, St. Petersburg, 199026 Russia

^b Southern Federal University, Rostov-on-Don, 344006 Russia

^c Moscow State Mining University, Moscow, Russia

e-mail: Vladimir_Vyalov@vsegei.ru; Gamov@sfedu.ru; apshtein@yandex.ru

Received February 15, 2012

Abstract—The results of studies of the fractured porous structure of the organic matter of coals and the com-
position of mineral impurities in oxidized black coals are reported. Data of petrographic and electron-micro-
scopic studies combined with microanalysis are given. The possibility of detecting the early stages of coal oxi-
dation based on the appearance of iron sulfate and oxide formed from pyrite was demonstrated.

DOI: 10.3103/S0361521913020122

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