Reaction between CaO-SiO2-Al2O3 slags and H2 + HCI + H2O gas mixtures

To better understand the thermodynamic behaviour of chlorine in blast furnaces, CaO-SiO2-Al2O3 slags were brought into equilibrium with Ar + H-2 + HCl + H2O gas mixtures at temperatures between 1673 K and 1798 K. The dissolution of chlorine into molten slags could be well interpreted through a reaction: (1/2) {CaO}(slag) + (HCl) = {Ca1/2Cl}(slag) + (1/2) (H2O). Conforming to this formula, a linear relation was observed between log (%Cl) and log (P-HCl(2) / P-H2O) with an anticipated slope of 1/2.