Reduction of FeO in Molten Slags with Solid Carbon

Abstract

The reduction rate of FeO in molten slags by rotating carbon rod or coke rod is determined. The testing temperature is ranged from 1 350°C to 1 450°C and FeO concentration is ranged from 5 percent to 90 percent. The results of analysis of data in the range of which the revolution speed of a rod has no effect on the FeO reduction rate indicate that the rate-determining step can best be interpreted to be chemical reaction and its reduction rate is proportional to the first order of the estimated FeO activity in slags. The obtained rate equation is:
-1/An_FeO=17.3·exp (-39700/RT)·α_FeO
Since FeO activity is generally not known at any temperature, a practical rate equation in which the activity of FeO at 1 600°C obtained by SAMARIN et al was used, is set up.
With respect to the effect of bubble in the experiment, bubbles cover a part of reaction front and surpress the reaction in the case of its slow generating rate, but break the laminar film on the rod and accelerate the reaction rate in the case of its fast generating rate. Foaming in this experiment vigorously occurrs in a slag with high density and surface tension.