THERMODYNAMIC EQUILIBRIUM IN THE SYSTEM OF SILICON ALLOY ‒ SLAG ‒ GAS
https://doi.org/10.17073/0368-0797-2015-12-884-890
Abstract
The condition of the original thermodynamic data of base chemical reactions between silicon and oxygen fl owing to form carbon monoxide and silicon dioxide have been analyzed. As a base for the parameter estimation of phase and chemical equilibrium in systems containing oxygen, the oxygen partial pressure was taken in the gas phase. The equilibrium value PSiO and PO2 was calculated for silicon alloys with values X|Si| = 0.1–1.0 at temperature range 1700 – 2300 K in a gas phase consisting of oxygen and silicon monoxide. The eff ect of the silicon oxide activity in the slag melt on the equilibrium composition of the gas phase was determined for systems “alloy – slag – carbon – dioxide”. It has been shown that temperature has the greatest eff ect on the gas phase composition at high-silicon alloys (aSi > 0.2). The diagram of phase and chemical equilibrium of Si – O – C shows that the boundaries of the monovariant SiO2 – C – gas, SiO2 – SiC – gas and SiO2 – Si – gas with a decrease in activity SiO2 in the melted slag are shifted toward higher temperatures and at a given temperature the concentration of silicon monoxide and oxygen are reduced.
About the Authors
N. F. Yakushevich
Siberian State Industrial University
Russian Federation
Russian Federation
N.F. , Dr.Sci. (Eng.), Professor of Chair “Nonferrous Metallurgy and Chemical Engineering”,
42, Kirova str., Novokuznetsk, Kemerovo Region, 654007
O. A. Polyakh
Siberian State Industrial University
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Аssist. Рrofessor of Chair “Non-ferrous Metallurgy and Chemical Engineering”,
42, Kirova str., Novokuznetsk, Kemerovo Region, 654007
G. V. Galevskii
Siberian State Industrial University
Russian Federation
Russian Federation
G.V. , Dr. Sci. (Eng.), Professor, Head of the Chair “Non-ferrous Metallurgy and Chemical Engineering”, Director of the Institute of Metallurgy and Materials,
42, Kirova str., Novokuznetsk, Kemerovo Region, 654007
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For citations:
Yakushevich N.F., Polyakh O.A., Galevskii G.V. THERMODYNAMIC EQUILIBRIUM IN THE SYSTEM OF SILICON ALLOY ‒ SLAG ‒ GAS. Izvestiya. Ferrous Metallurgy. 2015;58(12):884-890. (In Russ.) https://doi.org/10.17073/0368-0797-2015-12-884-890
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