Reduction kinetics of iron powder
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In the preparation of sponge iron by the composite method, reduction is governed by a predominantly diffusion-type mechanism, i.e., obeys an essentially parabolic law, when a loose charge is used; with a briquetted charge, a kinetic mechanism becomes operative, in consequence of which reduction is governed by a linear law.
The productivity of reduction furnaces is strongly affected by the specific weight of the charge held in the trays. By decreasing the specific weight from 7.5 to 5.5 g/cm2 and reducing the tray-pushing and reduction times from 17.5 to 9 min and from 315 to 170 min, respectively, it is possible to increase the productivity of the Brovary Powder Metallurgy Factory reduction furnaces in loose charge reduction by 35% compared with the present level.
KeywordsSponge Tray Powder Metallurgy Factory Reduction Reduction Time
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