Thermodynamic properties and phase equilibria in the Na2O–SiO2 system

Thermodynamic and Kinetic Behavior of B and Na Through the Contact of B-Doped Silicon with Na2O-SiO2 Slags

“…The thermodynamic activities in Na 2 O-SiO 2 slags were calculated with reference to the pure liquid states of the components employing FactSage thermodynamic software version 6.3 for 1773 K and 1823 K (1500°C and 1550°C) and the results are shown in Figure 6. In order to verify the calculated activities, selected experimentally measured activities in the literature [32] are also shown in Figure 6. The measured Na 2 O activities by Zaitsev et al for the temperatures between 1373 K and 1673 K (1100°C and 1400°C) are consistent with regard to the dependence of a Na 2 O on temperature as observed by Zaitsev et al [32] and recently Abdelouhab et al [33] .…”

“…In order to verify the calculated activities, selected experimentally measured activities in the literature [32] are also shown in Figure 6. The measured Na 2 O activities by Zaitsev et al for the temperatures between 1373 K and 1673 K (1100°C and 1400°C) are consistent with regard to the dependence of a Na 2 O on temperature as observed by Zaitsev et al [32] and recently Abdelouhab et al [33] . This is confirmed considering the experimentally measured activities by Goto et al [34] for 1773 K (1500°C), as seen in Figure 6.…”

Development of models and online diagnostic monitors of the high-temperature corrosion of refractories in oxy/fuel glass furnaces : final project report.

“…Thus, the MOH(g) partial pressure in the furnace atmosphere is the variable that determines if Reaction (3-5) is thermodynamically favorable. Whether or not the alkali carbonate condensed phase can form is determined by the equilibrium constant of Reaction (3)(4)(5)(6)(7)(8)(9), and the partial pressures in the furnace atmosphere. Note, however, that the temperatures required for carbonate formation to occur (< 13 80 K) arc not likely to be encountered by refractories in glass-melting furnaces.…”

“…Thus, in analogy with the previous analysis of gas-phase transport, the rate of recession is limited by the rate of diffusion through the liquid product layer. (4)(5)(6)(7)(8)(9) Here, Ax is the difference "etween the Na20 concentrations in t,,e liquid at the gadliquid and liquidsolid interfaces. This difference is at its maximum when xg,l is in equilibrium with the furnace gas and XI,^ is in equilibrium with the solid Si02.…”

“…The continuum model outlined below is frequently applied to gadliquid flows in oil fields and groundwater r e s e r~o i r s .~~ Assuming for simplicity that no reactions occur on the brick interior, the mass of the liquid phase is conserved as it is transported inward, requiring that 73 (4)(5)(6)(7)(8)(9)(10)(11)(12) Here, the liquid density, PI, and the brick porosity, 4, are taken as uniform and the saturation, s, represents the fraction of the local pore volume that is occupied by liquid. The remaining pore volume contains gas.…”