Abstract
Carbonate solubilities in Na2O-SiO2 melts were measured over the composition range XNa2O/ (XNa2O + XSiO2) = 0.5 to 1.0 and the temperature range 1100 to 1300 ‡C. The solubility increased with increasing XNa2O and decreased with increasing temperature. Carbonate capacities calculated from the experimental results compared favorably with values for sulfide and phosphate capacities obtained from the literature. In addition, an excellent correlation was obtained between carbonate capacity and the activity of sodium oxide. The carbonate capacity, which is an easier parameter to obtain, is a good measure of the basicity of sodium silicate melts. It would appear that carbonate capacity could be an excellent basicity index for iron and steelmaking slags as well as for fluxes used in other high temperature technologies.
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