FeO を含有するスラグによる高炭素濃度溶鉄中シリコンの酸化反応

概要

論文の詳細を見る
The rate of oxidation reaction of silicon between Fe-4.4%C-Si melt and Li_2O-CaO-SiO_2-FeO slag has been investigated under the condition of mechanical stirring at 1300℃. The initial concentrations of FeO in slag, (%FeO)_0, and silicon in metal, [%Si]_0, were 2.5∿30 and 0.008∿0.1, respectively. The rotating speed of the stirrer was 50∿400 rpm. The activity of silica, a_<SiO_2>, in the slag has also been determined experimentally by measuring the concentration of Si in carbon saturated iron equilibrated with SiO_2 in Li_2O-CaO-SiO_2 slag at P_<CO>=1 atm and 1300℃. In the explored concentration range of FeO in the slag, the apparent metal-side mass transfer coefficient of Si, k′_<Si>, increases with increasing (%FeO)_0, while k′_<Si> does not change much with varying [%Si]_0. It is found that k′_<Si> increases approximately in proportion to the 1/3 power of the rotating speed of the stirrer, but the effect of mechanical stirring on the mass transfer of FeO in the slag is negligible except at lower (%FeO). A mathematical model describing the simultaneous reactions of Si, C and FeO is developed. The reaction mechanism of the present slag-metal reactions is explained with the aid of the mathematical model.
社団法人日本鉄鋼協会の論文
1988-01-01