A simple and accurate density model for SiO2-Al2O3-CaO-MgO molten slags was established in this work, based on the linear relationship between molar volume and temperature. The model was calibrated by open published density measurements. Using current model, the iso-density lines for SiO2-Al2O3-CaO-MgO with 10%, 20%, 30% and 40% mass fraction of Al2O3 at 1773 K and 1873 K were plotted. The results showed that the calculated density values agree very well with measured values, with remarkable relative error of 1.08%, and absolute error (RMSE) of 0.041 g/cm3. It reveals that the density of the slags decreases obviously with increasing SiO2 content, whereas the effect of temperature on density is smaller.
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