The MgO solubility in CaO-SiO 2-FeO-Al 2O 3-MgO quinary slag system at 1823 K was measured to evaluate the effect of FeO and Al 2O 3 on the MgO solubility. It was found that the MgO solubility was decreased with higher optical basicity, FeO concentration, and increased with higher Al 2O 3 concentration. The MgO solubility was affected by activity coefficient of Mg 2+ (γ Mg2). Increase of the activity coefficient of Mg 2+ (γ Mg2) with higher FeO or lower Al 2O 3 decreased the MgO solubility. The increment in MgO solubility is remarkably reduced beyond a critical X Al2O3/(X Al2O3 + X FeO) ratio. The significant decrease of the increment of MgO solubility is caused by the change of the molten slag structure. The excess stability function of Al 2O 3 and the Fourier transform infrared (FT-IR) analysis were applied to indirectly verify the existence of the spinel structure in the CaO-SiO 2-FeO-Al 2O 3-MgO slag system.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Metals and Alloys
- Materials Chemistry