Activity of MnO in MnO-CaO-SiO 2 -Al 2 O 3 -MgO Molten Slags

摘要: The activities of MnO in the MnO-CaO-SiO2-Al2O3 (10, 20, and 30 mass pct)-MgO (5 pct) melts at 1873 K (1600 °C) were measured by equilibrating with liquid copper under an oxygen partial pressure controlled CO/CO2 gas mixture a volume ratio 99/1. Over investigated composition range, shows negative deviation from Raoultian behavior. On basis experimental data, activity coefficient this multicomponent was evaluated using following quadratic formalism based on regular solution model: \( RT\ln {\gamma_{{\text{MnO}}({\text{s}})}} = \sum\limits_j {{\alpha_{ij}}x_j^2} + {\sum\limits_k {( {{\alpha_{ij}} {\alpha_{ik}} - {\alpha_{jk}}}){x_j}{x_k} I{^\prime}} } . \) values conversion factor, I′, for containing 10, pct Al2O3 determined to be 6950, 2715, 12092 J/mol, respectively. Iso-activity contours five component system calculated formalism, they showed good agreement data.