α-Fe_2O_3 結晶-Na_2O-B_2O_3 系融体間のマンガン分配

概要

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A study has been made of the partition of Mn between α-Fe_2O_3 crystal and sodium borate fluxes at the temperatures ranging from 800℃ to 1100℃ as a function of flux compositions. The total Mn content in α-Fe_2O_3 is linearly related to that in flux in the range of the present T.Mn contents in both phases. The temperature dependence of the partition coefficient k_<T. Mn>=(wt%Mn)_<solid>/(wt%Mn)_<liquid> was found to be positive. It was found that Mn is present as Mn^<3+> in α-Fe_2O_3 crystal and Fe and Mn in flux are present as Fe^<3+> and Mn^<2+>, respectively. On the basis of the mutual interaction of the Mn^<3+>/Mn^<2+> and Fe^<3+>/Fe^<2+> redox pairs : Fe^<3+>(s)+Mn^<2+>(l)=Mn^<3+>(s)+Fe^<2+>(l), the partition between solid and liquid phases with a different valency state has been discussed.
社団法人日本鉄鋼協会の論文
1990-10-01