Synthesis, heating, and melting of stoichiometric glass (CaSiO3•SiO2)
V.S. Engelsht1 and V.Zh. Muratalieva2
1 Institute of Physical and Technical Problems and Material Science NAS KR
Bishkek, Kyrgyzstan
2 Kyrgyz State Technical University
Bishkek, Kyrgyzstan
Е-mail: ven.m.j@rambler.ru
Keywords: thermodynamic analysis, exothermic effect, glass, synthesis, heating, melting, temperature, enthalpy, heat of reaction, heat content
Pages: 113–118
Abstract
Thermodynamic analysis (TERRA program) of synthesis, heating, and melting of stoichiometric glass CaSiO3•SiO2 has been carried out. Chemically pure substances silica and lime are subjected to exothermic reaction with further external heating and melting. Wollastonite is synthesized, the chemical reaction generates heat Qchr = −505.3 kJ/kg, and temperature increases Т = 820 K. When Тmelt = 1812–1814 K, wollastonite melts, and a mixture of liquid wollastonite and condensed silica is formed. At Тmelt = 1995–1997 K, silica melts, and stoichiometric glass (CaSiO3•SiO2) is formed. Evolutions of temperature and melting of wollastonite and silica have been studied by detailed step-by-step thermodynamic calculation (ΔТ = 0.1 K).
DOI: 10.1134/S0869864314010119
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