Dissolution of carbon dioxide in CaO-CaF2-Al2O3 based melts containing Na2O or K2O oxide

The influence of Na₂O or K₂O on the solubility of CO₂ in CaO-CaF₂-Al₂O₃ based melts is measured by a thermogravimetric technique over a temperature range of 1250–1350°C. The values of the carbonate capacities (C'_c = wt. % ) are calculated by data on the dissolution and partial pressure of carbon dioxide. The replacement of CaO by Na₂O leads to an increase of the carbonate capacity to a maximum at 3–3.5 wt. % Na₂O and then to a decrease. The addition of Na₂O or K₂O up to 2 wt. %, to CaO-CaF₂-Al₂O₃ increases the carbonate capacity at 1300°C by 30%.