Sulfide capacities of CaO-CaF₂-CaCl₂ melts

Abstract

The sulfide capacity$C_{s^{2 - } } = ({\text{pct S}}^{{\text{2 - }}} )(p_{{\text{O}}_{\text{2}} } /p_{{\text{S}}_{\text{2}} } )^{1/2} )$ of CaO-CaF₂-CaCl₂ slag was determined at temperatures from 1000 °C to 1300 °C by equilibrating molten slag, molten silver, and CO-CO₂-Ar gas mixture. The sulfide capacity increases with replacing CaCl₂ by CaF₂ in slags of constant CaO contents. The sulfide capacity also increases with increasing temperature as well as with increasing CaO content at a constant ratio of CaF₂/CaCl₂ of unity. A linear relationship between the sulfide capacity and carbonate capacity in literature was observed on a logarithmic scale.