還元雰囲気下1600℃におけるMgO-Al_2O_3-SiO_2-CaO系スラグ中へのMgO・Cr_2O_3の溶解度

概要

論文の詳細を見る
The solubility of MgO・Cr_2O_3 into MgO-Al_2O_3-SiO_2-CaO slags and the activities of chromium oxide in the slags were measured at 1 600℃ under reducing conditions. For MgO-SiO_2 melts which were saturated with 2MgO・SiO_2, the solubility of MgO・Cr_2O_3 increased with decreasing oxygen partial pressure, because of decrease in γ_<CrO_<1.5>>. When CaO is added to the melts mentioned above, soluble total chromium content decreased because γ_<CrO_<1.5>> and γ_<CrO> increased with increasing CaO content in the melts. Under a fixed oxygen partial pressure, activities of chromium oxides in the chromite Mg・(Cr_xAl_<1-x>)_2O_3 were also measured by equilibrating them with Ni-Cr alloys for which the activity coefficient ^°_<Cr>(at 1600℃) was determined as 0.421 in this study. It was found that the free energy change of the reaction : MgO(s) + Cr_O_03(s)=MgO・Cr_2O_3(s) is expressed by -126800 + 47.3 T(J/mol) and that MgO・Cr_2O_3 and MgO・Al_2O_3 form a solid solution which exhibits negative deviation from ideal behavior at 1600℃.
社団法人日本鉄鋼協会の論文
1988-06-01