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Morphological changes during reduction of magnetite compacts
Author(s) -
Kumar Dube Ravindra,
Deo Brahma
Publication year - 1987
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198700237
Subject(s) - wüstite , magnetite , porosity , scanning electron microscope , sintering , metallurgy , materials science , iron oxide , direct reduced iron , hematite , reduction (mathematics) , electron microscope , mineralogy , chemistry , composite material , geometry , physics , optics , mathematics
Magnetite superconcentrate compacts were reduced to wustite and iron at various temperatures (1173‐1423 K) and the morphological changes occurring at various stages of reduction were observed under the scanning electron microscope. It has been demonstrated that considerable pitting and fragmentation occur during solid state reduction of Fe 3 O 4 to FeO by solid iron. During the reduction of FeO the iron nuclei formed have a tetrahedral shape. At low reduction temperatures (1173 K) the large number of iron nuclei formed on wustite sinter together forming a dense iron layer. At high temperatures sustained growth of nuclei in the vertical direction leads to a sinuous porosity. Genesis of porosity creation has also been explained in terms of formation of holes, slits, cracks and fragmentation in magnetite and wustite and growth and sintering of iron nuclei.