Abstract
1. It was established that, during the first stage of reduction, a Fe2O3 base charge tends to acquire an impervious iron skin which subsequently prevents the full reduction and desulfurization of the underlying charge layers. This phenomenon is due to the fact that, unlike the endothermic processes of scale reduction, the processes of Fe2O3 reduction in the first zone of the furnace are exothermic. In view of this, it is recommended that in complex reduction either the temperature in the first zone of the furnace muffle should be lowered or the carbon content of the starting charge should be raised to 11–12%. 2. The low apparent density of the resulting powders (1.5–1.7 g/cm3) necessitated a study with the aim of determining suitable conditions for the subsequent hammer and ball milling of these powders. It was found that the apparent density of the powder may be raised to 2.6 g/cm3 by employing additional treble hammer milling or even to 3 g/cm3 by employing additional ball milling for 9 h. 3. The mechanical properties of specimens with porosities ranging from 15 to 30%, pressed from the experimental powder and sintered under various conditions, were found to be virtually no different from those of specimens prepared under the same conditions using powder reduced from scale.
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