ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Rate of Iron Carburization by Carbon in Slags through Carbon/Slag and Slag/Metal Reactions at 1723 K
Hideki OnoKenji TanizawaTateo Usui
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2011 Volume 51 Issue 8 Pages 1274-1278


The carbide capacity of CaO–SiO2–Al2O3 slags and the rate of iron carburization through successive phases of carbon, slag, and metal are measured at 1723 K. The carbide capacity of high-basicity slag is higher than that of simulated blast-furnace (BF) slag. The iron carburization rate through CaO–SiO2–Al2O3 slags is much smaller than the rate of direct carburization or that through slags including iron oxide. It is found that the rate of carburization of iron through slags increases with increasing slag basicity. The apparent rate constant of the carburization reaction is derived to be k = 2.71 × 10–5 mol/(m2 s) for the simulated BF slag and k = 8.00 × 10–5 mol/(m2 s) for the high-basicity slag. The rate increases with increasing slag basicity, increasing carbide capacity, and decreasing oxygen partial pressure.

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© 2011 by The Iron and Steel Institute of Japan
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