Abstract
The e. m. f. measurement of double cells was applied to determine directly the activity of CaO in the ternary system CaO-SiO2-AI2O3, CaO-SiO2-MgO and CaO-SiO2-MnO at 1600°C.The e. m. f. of 54 kinds of slags was measured at 1600°C and their activities of CaO were determined in relation to the solid lime by the same method as in the previous work.Relations between the activity of CaO and basicity ratio of the slags were found and three diagrams of constant CaO activity were plotted for the three systems.The reduced basicity ratio (CaO/SiO2) R was introduced for the effect of third components on the basicity ratio CaO/SiO2 of the slags.
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