スラグ中酸化鉄による溶鉄中炭素の酸化速度

概要

論文の詳細を見る
The rate of oxidation of C__- in Fe-C, Fe-C-Si and Fe-C-P melts ([%C]=4.4) by FeO in Li_2O-CaO-SiO_2 slag has been investigated under the condition of mechanical stirring at 1300℃. The initial concentration of FeO in the slag was varied from 4.6 to 20% and those of Si__- and P__- in the melt were varied from 0.004 to 0.33% and from 0 to 0.1%, respectively. In the experiment for investigating the effect of P in the slag on the C__- oxidation, the initial concentration of P in the slag was changed in the range of 0∿2%. It is found that the C__- oxidation rate greatly reduces when a small amount of P is added to the slag while P__- in the metal has no significant effect on the C__- oxidation. The rate of C__- oxidation decreases with increasing Si__- concentration in the metal. A mathematical reaction model is proposed for the oxidation of C__- in the metal by FeO in the slag. The model assumes the existence of CO bubbles in the slag-metal interfacial region. Three rate determining steps are taken into account, namely chemical reaction at the gas-slag interface, mass transfer of CO_2 in the bubble and chemical reaction at gas-metal interface. The experimental result is in good agreement with that calculated from the model.
社団法人日本鉄鋼協会の論文
1990-04-01