Reduction Behavior of Sinter under Blast Furnace Conditions

Abstract

The authors developed a blast furnace inner-reaction simulator(BIS) which can simulate the behavior of reducing, softening, and melting of iron bearing materials in a blast furnace. BIS is an advanced equipment of the BORIS furnace developed by IRSID. The reduction behavior of sinter under the blast furnace conditions was investigated by BIS on two typical temperature profiles ofen found in the blast furnace, i.e. profile A having a considerably long thermal reserve zone of 1 000°C and profile B having two stage thermal reserve zones of 600°C and 1 000°C.
The reduction degradation behavior, reduction behavior, the change of the pore structure in the reduction process, and the effect of the temperature profile on them were clarified.
The feature of reduction behavior in the blast furnace is that the reduction degree is at a low value of 30% at the end of the thermal reserve zone of 1 000°C and that the reduction rapidly proceeds in the high temperature range below the thermal reserve zone. This reduction behavior indicates that the reducibility in the high temperature range is important as the reduction property of sinter.