Mn_tO-CaO-SiO_2-Al_2O_3 融体中マンガンの酸化還元平衡

概要

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The redox equilibrium between Mn^<3+> and Mn^<2+> in Mn_tO-CaO-SiO_2-Al_2O_3 melts at temperatures ranging from 1245 to 1450℃ was investigated as a function of composition, oxygen partial pressure close to that of air. In the composition range studied, the concentration ratio (%Mn^<3+>)/(%Mn^<2+>) increased with an increase in basicity and in MnO content. As a result, Mn_2O_3 is inferred to behave as an oxoacid ion such as MnO_x^<(2x-3)-> in slag melts. The above mentioned ratio increased proportionally to the approximate fourth root of oxygen partial pressure, as predicted theorically. The enthalpy change of oxidation of Mn^<2+> to Mn^<3+> was found to be-9150cal/mol Mn^<2+>. In the light of these findings, Mn^<3+> content in sintered manganese ores and slags for ferromanganese production was discussed in terms of equilibration with the environment.
社団法人日本鉄鋼協会の論文
1987-12-01