Iron Carbide Synthesis by Reaction of Iron Ore with H2-CH4 Gas Mixtures Containing Traces of Sulfur

Particles of hematite ores in a porcelain boat were reacted at 873∼1273 K by H2-CH4 mixtures having low sulfur activities as based on Fe/FeS equilibrium where metallic iron remained stable. In the tests without sulfur, much free carbon appeared beside metallic iron and iron carbide. The free carbon...

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Bibliographic Details
Published in:ISIJ International 1997/04/15, Vol.37(4), pp.345-349
Main Authors: Hayashi, Shoji, Iguchi, Yoshiaki
Format: Article
Language:English
Subjects:
Applied sciences
carburization
Direct reduction
Exact sciences and technology
gaseous reduction
gaseous sulfur
H2-CH4 gas mixture
Iron and steel making
iron carbide
iron ore
Metals. Metallurgy
Production of metals
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Summary:Particles of hematite ores in a porcelain boat were reacted at 873∼1273 K by H2-CH4 mixtures having low sulfur activities as based on Fe/FeS equilibrium where metallic iron remained stable. In the tests without sulfur, much free carbon appeared beside metallic iron and iron carbide. The free carbon increased with temperatures. In the tests with sulfur, nearly one hour reaction could convert their particles mostly to iron carbide such as Fe3C, especially favorable in as=0.1∼1.0 at 1173∼1223 K. The conversion yield was sensitive to inlet flow volume ratio H2/CH4 and ore type, while the authors' previous test in H2-CO gas mixtures had already indicated their insensitivity.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.37.345