The Activity Coefficient of CoO in SiO2 Saturated MnO-SiO2 Slag at 1623 K

The activity coefficient of CoO in SiO 2 -saturated MnO-SiO 2 slag was measured using metal-slag-gas equilibrium experiments under controlled oxygen potentials (10 −12 to 10 −10  atm) at 1623 K. The solubility of CoO in the slag increased with increasing oxygen potential and cobalt content in the alloy. The activity coefficient of cobalt oxide, γ CoO , referred to solid CoO, can be described as: γ CoO  = 1.65 − 0.14 (wt pct CoO), where (wt pct CoO) represents the mass percent of CoO in the slag.