Effect of slag composition on the crystallization of synthetic CaO-SiO2-Al2O3-MgO slags: Part II- Measurement and prediction of critical cooling rate

In this study, the critical cooling rate (RC) of CaO-SiO2-Al2O3-MgO slag samples are determined using time-temperature-transformation (TTT) and continuous cooling transformation (CCT) diagrams, obtained using the hot thermocouple technique. The relationships between RC and slag composition, and slag viscosity are investigated. It is shown that a theoretical treatment of nucleation and growth rates of slag crystals leads to the following correlation that can be employed to predict the RC from the liquidus temperature (TL)and slag viscosity at the nose temperature (ηnose) of the TTT diagram.Rc=1.23×10−5TL2/ηnose