Kinetics of Reactions between High Carbon Molten Iron and FeO Containing Slag

概要

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The rate of silicon oxidation between Fe-4.4% C-Si alloy and Li2O-CaO-SiO2-FeO slag has been investigated under the condition of mechanical stirring at 1300°C. The initial concentrations of FeO in the slag, (%FeO)0, and of silicon in the metal, [%Si]0, were 2.5-30 and 0.008-0.1, respectively. The rotating speed of stirrer was 50-400rpm. The activity of SiO2, aSiO2, in the slag has also been determined experimentally by measuring the concentration of silicon in carbon saturated iron equilibrated with SiO2 in the Li2O-CaO-SiO2 slag at PCO=1 atm and 1300°C.Under the experimental conditions adopted, the apparent mass transfer coefficient in the metal phase, 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 stirrer. However, the effect of mechanical stirring on the mass transfer of FeO in the slag is negligible except at low (%FeO). A mathematical model describing the simultaneous reactions of silicon, carbon and FeO is proposed. The reaction mechanism of the slag-metal reactions is explained with the aid of the mathematical model proposed.
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