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Synopsis : The rate of oxidation reaction of silicon between Fe-4.4%C-Si melt and Li2O-CaO-Si02-FeO slag has been investigated under the condition of mechanical stirring at 1 300•Ž. The initial concentrations of FeO in slag, (%FeO)o, and silicon in metal, [%Si]o, were 2.5-30 and 0.008 •` 0.1, respectively. The rotating speed of the stirrer was 50-400 rpm. The activity of silica, asiO2, in the slag has also been determined experimentally by measuring the concentration of Si in carbon saturated iron equilibrated with SiO2 in Li2O-CaO-SiO2 slag at PCO 1 atm and 1 300•Ž. 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)o, while k'si does not change much with varying [%Si]o. It is found that lesi 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.

Oxidation Reaction of Silicon in Molten Iron of High Carbon Concentration by FeO Containing Slag