Journal of the Southern African Institute of Mining and Metallurgy
On-line version ISSN 2411-9717
XU, J.F. et al. Measuring and modelling of density for selected CaO-Al2O3-MgO slags. J. S. Afr. Inst. Min. Metall. [online]. 2015, vol.115, n.8, pp. 767-772. ISSN 2411-9717. http://dx.doi.org/10.17159/2411-9717/2015/V115N8A14.
The densities of selected CaO-Al2O3-MgO slag systems were measured at 1823K by the Archimedean method. Thirteen different slag compositions were chosen based on different levels of the MgO content and the mass ratio of CaO/Al2O3. The results indicated that the density of the slag decreases with increasing MgO content (from 0-3.78 mass%), but increases with further increases in MgO content up to 11.33 mass%. At a fixed MgO content of 5.5%, the trend of density change with CaO/Al2O3 in the slag is similar to that for changes in MgO content. On the basis of the regular solution approximation rules of excess molar quantities, an attempt was made to estimate the molar volume of the slags investigated. The application of the molar volume model confirmed that the present expanded approximation rules are applicable to predict the molar volumes of the melts discussed.
Keywords : slag density; CaO-Al2O3-MgO system; molar volume; modelling.