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The equilibrium compositions of high-silicon metallic melts coexisting with CaO–Al2O3–SiO2 slag are determined. The dependence of the activity a of silicon in ferrosilicon melts is formulated as activity isolines on the Fe–Si phase diagram. The dependence of log $${P_{{O_2}}}$$ on xSi and T is determined at 1823, 1873, and 1973 K. The influence of $${a_{Si{O_2}}}$$ which depends on xSi...