Carbonate Capacities of Na₂O-SiO₂-B₂O₃ Melts

Abstract

CO₂ solubilities of Na₂O-SiO₂-B₂O₃ melts were determined by the thermogravimetric method in the overall temperature range of 1000-1250°C after correction for loss of weight due to volatilization from the melts as well as drag force of flowing gas. The melts had mostly 50 mol%. Na₂O, with SiO₂ and B₂O₃ contents varying from 0 to 50–mol%. The values of CO₂ Solubilities for 50Na₂O-50SiO₂ melts were within the ranges reported in literature. For 50 mol% Na₂O, the solubility decreased with increasing B₂O₃ content in the melt and with increase in temperature. Also linear dependence of logarithm of carbonate capacity with theoretical optical basicity were obtained at constant temperatures.