1970 Volume 56 Issue 10 Pages 1301-1310
For the purpose of clarifying the mechanism of the reduction of iron are in the high temperature range from 900°C to 1 450°C, the rate of reduction by CO gas with and without the presence of coke was studied.
In the case of reduction by CO gas only, the rate increased with the increase of temperature, but it became smaller when are or pellet began to fuse.
The rate of reduction was remarkably accelerated by solid coke when are or pellet fused, however, this effect of coke was weak when it remained in the solid state.
The rate of reduction by CO gas when temperature was raised with time was also studied and it was found that there were functional relations between heating velocity and reduction rate in the temperature rangefrom 900deg;C up to the fusion temperature. When the temperature was changed linearly with time, the degree of reduction increased linearly with temperature.
A specially designed thermobalance with strain gauge was employed in this study.