The effects of SiO2 and B2O3 on the ionic structure of CaO–Al2O3 binary slag under the MgO-and-spinel doubly saturated (MSDS) condition were evaluated by measuring the MgO solubility of the slag. The activity coefficient of AlO4 5− in the slag was deduced by evaluating the equilibrium constant of the ionic reaction. In addition, the proportion of each bridging oxygen (BO) linkage species and the enthalpy of solution with the 4-coordinate Al ion (4Al) were derived by combining the Al avoidance model with the 11B and 27Al magic angle spinning nuclear magnetic resonance spectra results. The enthalpies, activity coefficient of AlO4 5−, and enthalpy of the solution with 4Al had good agreement in BO-dominant regions. From these results, the effects of the structural properties of slag on the stability of AlO4 5− and MgO solubility in the MgO-and-spinel doubly saturated slag were investigated in detail.
Bibliographical noteFunding Information:
This work was supported by the third stage of Brain Korea 21 Plus Project in Division of Creative Materials and the Korea Evaluation Institute of Industrial Technology Project No. 10076604 .
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry