INFLUENCE OF LI2O ON THE CARBONATE CAPACITY OF CAO-CAF2-AL2O3 MELTS

The influence of Li2O on the carbonate capacity of CaO-CaF2-Al2O3-base d fluxes is examined by a thermogravimetric technique over the tempera ture range 1250-degrees-C to 1350-degrees-C. The values of the carbona te capacities (C'c = wt pct CO2/P(CO2)) were calculated by the solubil ity and the partial pressure of carbon dioxide. The replacement of CaO by Li2O resulted in a decrease of the carbonate capacity. The additio n of Li2O, from 0.4 to 2.0 pct, to the CaO-CaF2-Al2O3 increases the ca rbonate capacity at 1300-degrees-C by 50 pct. At 0.4 pct Li2O, C'c is 1.2, and at 2.1 pct Li2O, C'c is 2.1. The replacement of CaF2 by Al2O3 was found to have no significant influence on the carbonate capacity of the investigated ternary system.