Absorption of gaseous oxygen by liquid iron
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PREVIOUS RESEARCH The kinetics of the reaction between gaseous oxygen and high purity molten iron have been considered by few i n v e s t i g a t o r s . F o r t u n a t o v and M i k h a i l o v s k a y a 1 studied the r a t e of oxidation of m o l t e n i r o n b y p a s s i n g a s t r e a m of pure oxygen a g a i n s t the s u r f a c e of m e l t s at v a r i o u s t e m p e r a t u r e s . At t e m p e r a t u r e s b e t w e e n 1565~ and 1650~ they found oxygen to be a b s o r b e d b y diffusion through a n oxide l a y e r . At t e m p e r a t u r e s above 1700~ the oxide l a y e r did not s e e m to impede the a b s o r p t i o n . Lange 2 d i r e c t e d a jet of oxygen at a m o l t e n bath of i r o n and followed the r i s e in t e m p e r a t u r e of the m e l t as a m e a s u r e m e n t of the r a t e of the r e a c t i o n . He concluded that diffusion of oxygen in the m e l t c o n t r o l s the r a t e of oxidation until the m e t a l b e c o m e s s a t u r a t e d with oxygen. Nandori, s u s i n g a s i m i l a r e x p e r i m e n t a l approach, c o n c u r r e d with t h e s e c o n c l u s i o n s . S e v e r a l a t t e m p t s have b e e n made to e s t i m a t e the r a t e of r e a c t i o n of oxygen with liquid i r o n by c o m b u s t i o n of p i e c e s of solid i r o n in s t r e a m s of pure oxygen. 4-8 The r a t e was found to be l i m i t e d a p p a r e n t l y by T. EMI is Senior Research Associate,Research Laboratories, Kawasaki Steel Corporation, Chiba, Japan. W. M. BOORSTEIN is Associate Professor, Department of MetallurgicalEngin~ring, Ohio State University, Columbus, Ohio. R. D. PEHLKE is Professor and Chairman, Department of Materials and MetallurgicalEngineering,The University of Michigan, Ann Arbor, Mich. 48104. Manuscript submitted May 14, 1973. METALLURGICALTRANSACTIONS
diffusion of oxygen a c r o s s a l a y e r of liquid oxide. R o b e r t s o n and J e n k i n s have studied the r a t e of oxidation of i r o n in pure oxygen by the l e v i t a t e d d r o p l e t technique. 7 In this study, the r e a c t i o n was followed u s i n g a h i g h - s p e e d c a m e r a . A n a l y s i s of the quenched d r o p l e t p e r m i t t e d the oxidation r a t e to be e s t i m a t e d u n d e r t h e i r e x p e r i m e n t a l conditions. Vig and i n s t u d led the oxidation k i n e t i c s of f a l l i n g d r o p l e t s of m o l t e n i r o n in oxygen and oxygen gas m i x t u r e s , s In all t h e s e s t u d i e s the e x p e r i m e n t a l conditions could not be c o n t r o l l e d a d e q u a t e l y to yield s u i t a b l e data for k i n e t i c analysis.
E X P E R I M E N T A L METHOD The a p p a r a t u s and p r o c e d u r e s e m p l o y e d in this study have b e e n d e s c r i b e d in detail p r e v i o u s l y . 9 The b a s i c c o m p o n e n t s of the e x p e r i m e n t a l g a s - m e t a l r e a c t i o n unit a r e i l l u s t r a t e d in Fig. 1. A r e c r y s t a l l i z e d a l u m i n a c r u cible (32 m m d i a m x 33 m m high), p r
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