Über Die Reduktion Von Wüstit, Magnetit Und Eisen-Mangan-Mischoxyden
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Die Bedeutung der rationellen Reduktion der Eisenerze f�hrte zu zahlreichen Unter- suchungen auf diesem Gebiete. Dabei wurden die physikalischen und chemischen Eigen- schaften der Eisenoxyde und deren thermodynamisches Verhalten weitgehend gekl�rt. Die Zustandsdiagramme der Systeme Eisen-Sauerstoff, Eisen-Sauerstoff-Wasserstoff und Eisen-Sauerstoff-Kohlenstoff sind hinreichend bekannt. Dagegen sind die erst sp�ter einsetzenden Untersuchungen �ber die Kinetik der Eisenoxydreduktion bis heute nicht abgeschlossen. Die in der Literatur erschienenen Arbeiten zeigen, da die Reduktionsvorg�nge vielseitig beeinflu bar sind. Neben der Geschwindigkeit der chemischen Reaktion an der Phasen- grenze Gas/Oxyd, die von der Temperatur, den Partialdr�cken der Gaskomponenten und von der Gr� e der Reaktionsfl�che abh�ngt, spielen die Transportvorg�nge in der Gasphase und im Festk�rper eine wesentliche Rolle. Die Struktur des sich auf dem Oxyd ausbildenden Reduktionsproduktes hat somit entscheidenden Einflu auf die Abbau- geschwindigkeit des Sauerstoffes. Bildet sich an der Oxydoberfl�che eine por�se Schicht des Abbauproduktes aus, so kann die Phasengrenzreaktion bis zu hohen Reduktions- graden die Abbaugeschwindigkeit bestimmen. Der Einflu der Gasdiffusion durch die Poren macht sich erst bei hinreichend dicken Schichten bemerkbar. Bildet sich dagegen eine dichte, das gesamte Oxyd abdeckende Schicht aus, so kann die Festk�rperdiffusion geschwindigkeitsbestimmend werden. Die technisch verh�tteten Eisenerze sind keine reinen Eisenoxyde, sondern Misch- kristalle, Verbindungen oder Gemische mehrerer Oxyde. W�hrend die Gleichgewichte f�r viele Oxyd-Mischkristalle und bin�re Oxydverbindungen bereits untersucht wurden, ist �ber den Ablauf der Reduktion dieserStoffe noch wenig bekannt.
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