Thermodynamic Evaluation of the Compounds of Gold, Silver,
and Other Trace Elements Formed Upon
the Combustion of Brown Coal

M. Ya. Shpirt^a, A. A. Lavrinenko^b, I. N. Kuznetsova^b, and A. M. Gyul’maliev^a

^a Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninskii pr. 29, Moscow, 119991 Russia

e-mail: shpirt@yandex.ru

^b Institute of Comprehensive Exploitation of Mineral Resources Moscow, 111020, Russia

e-mail: lavrin_a@mail.ru

Received March 14, 2013

Abstract—The thermodynamically most probable main compounds of Ag, Au, Ge, Se, Sr, U, and ash-forming
elements formed upon the combustion of brown coal, which was close in the composition of organic and min-
eral matter to coal from the Nazarovskoe deposit of the Kansk-Achinsk Basin, were determined. According to
the experimental data, silver (in the form of AgO(g)) and gold (in the form of Au(g)) quantitatively passed into
a gas phase at temperatures higher than 200 and 1179C, respectively; selenium passed into a gas phase in the
form of SeO₂(g) at t = 800–1000C and in the form of SeO₂(g) and SeO(g) at t 1000C. TheSeO(g) : SeO₂(g)
ratio increased with temperature. Germanium formed gaseous GeO(g) and GeO₂ at t1000C, and the
amount of the former dramatically increased with temperature.

DOI: 10.3103/S0361521913050121

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