The following concentration cell: Fe-Si|CaO-SiO-(Al
2O
3) (I)|O
2|CaO-SiO
2-Al
2O
3 (II)|Fe-Si with ferrosilicon electrodes containing 42%Si was studied at 1,630° Plotting the e.m.f. obtained on the CaO-SiO system against the wt%SiO
2, to the reference slag: CaO 45.2 wt%, SiO
2 2.2 wt%. Al
2O
3 53.7 wt%, the curve was characterized by a break which corresponds to CaO. SiO
2 composition. The activity of SiO
2 on the system CaO-SiO
2 was calculated from the e.m.f. by the following equation: −
E=
RT⁄4
FlnSiO
2, and the value was compared with the data reported in literatures. Further, iso-activity lines that correspond to the iso-baritic ones observed in the system CaO-SiO-AlO showed considerably complicated figures which might be responsible for the behaviors of Al
2O
3 in the slags. From this investigaten, it is supposed that the most probable anion species of silica in the studied slags would be SiO
44− and SO
32−.
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