Phase and chemical equilibria in the melt (Fe-Si-C)-Slag (CaO-Al sub(2)O sub(3)-SiO sub(2))-Gas (O sub(2)-SiO-CO) system

(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).The equilibrium compositions of high-silicon metallic melts coexisting with CaO-Al sub(2)O sub(3)-SiO sub(2) 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 ... on x sub(Si) and T is determined at 1823, 1873, and 1973 K. The influence of ... which depends on x sub(Si) and T, on the equilibrium composition of the gas phase ... is studied. Data on the activity of silicon dioxide in CaO-Al sub(2)O sub(3)-SiO sub(2) slags is analyzed and corrected. At fixed temperature, each alloy of specified composition corresponds to only one value of ... represented on the concentration diagram by an activity isoline. In the presence of carbon, all the high-silicon alloys may be obtained at T greater than or equal to 1973 K, with ... > 0.8. At 1873 K, when ... > 0.9, only alloys with