Abstract
By analysing experimental data obtained from saggers with 250 mm inside diameter, the reduction mechanism of Höganäs sponge iron process was clarified. The reduction velocity of magnetite pellet by carbon monoxide, which was obtained from thermobalance measurement, was compared with the data of sagger experiments. As the result, it was concluded that magnetite layer in a sagger is reduced by carbon monoxide gas, and that the rate determining stage is diffusional removal of the reducing gas through sponge iron layer.
