FeO・Cr_2O_3-MgO・Cr_2O_3-MgO・Al_2O_3 系スピネル固溶体の成分活量

概要

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The activity of iron chromite in solid FeO・Cr_2O_3-MgO・Cr_2O_3-MgO・Al_2O_3 spinels, saturated with (Cr, Al)_2O_3, was determined at 1573 K, by the equilibrium of iron dissolved into liquid silver in the spinel crucible with CO-CO_2 gas mixture, to clarify the thermodynamic properties of chromium ores used in ferrochromium industry. The phase relation between (Cr, Al)_2O_3 and FeO・Cr_2O_3-MgO・Cr_2O_3-MgO・Al_2O_3 spinel phase was studied, and the solubility of (Cr, Al)_2O_3 in FeO・Cr_2O_3-MgO・Al_2O_3, MgO・Cr_2O_3-MgO・Al_2O_3 and FeO・Cr_2O_3-MgO・Cr_2O_3-MgO・Al_2O_3 spinel phases was found to be small. The activity of FeO・Cr_2O_3 in FeO・Cr_2O_3-MgO・Cr_2O_3-MgO・Al_2O_3 spinel solid solution coexisted with (Cr, Al)_2O_3 shows negative deviation from ideality. It was observed that the spinel solid solution took regular solution behavior, and α-function of each pseudo-binary in FeO・Cr_2O_3-MgO・Cr_2O_3-MgO・Al_2O_3 system was determined as follows ; α_<FeO・Cr_2O_3-MgO・Al_2O_3>=-92, 000 (J), α_<MgO・Cr_2O_3-MgO・Al_2O_3>=-30, 000 (J).
社団法人日本鉄鋼協会の論文
1994-11-01