炭素共存下における CaO-MgO-Al_2O_3-SiO_2 系溶融スラグ中クロム酸化物の熱力学

概要

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The equilibrium concentrations of Cr in the molten CaO-MgO-Al_2O_3-SiO_2 system with Cr_3C_2, C, and one atmosphere of CO were determined at 1500℃ and 1650℃. Chromium in the slag was found to exist as CrO from a thermochemical consideration. The activity coefficients of CrO, γ_<CrO> were calculated from the determined concentrations. The Cr^<2+> ion in the melts was found to behave amphoterically with a critical (SiO_2) concentration of 30wt%. In the CaO-Al_2O_3-SiO_2 melts, Al_2O_3 was observed to increase γ_<CrO> in the region where chromium oxide behave as base. Therefore the equilibrium concentration of chromium decreased with increasing (Al_2O_3) at constant CaO/SiO_2. In the system of CaO-MgO-Al_2O_3-SiO_2, the effect of (Al_2O_3) was complicated, because of the existance of MgO. The γ_<CrO> values were found to have close relationship with γ_<TiO_<1.5>> and γ_<MnO>.
社団法人日本鉄鋼協会の論文
1982-05-01