Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Reduction, Carburization and Melting Behavior of Iron Ore Pellets containing Coal Char or Graphite on Heating
Fanming MENGYoshiaki IGUCHIIsao KOJIMA
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2001 Volume 87 Issue 9 Pages 585-592

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Abstract

Reactions in iron ore-coal char composite pellets heated in nitrogen atmosphere at temperatures between 1100°C and 1350°C were investigated. Coarsening and melting of reduced iron particles through their carburization were furthermore investigated for iron ore-coal char (pellet Pc, i) and iron ore-graphite (pellet Pg, i) composite pellets. Direct carburizaiton of iron in contact with carbon is superior to indirect carburization through gas phase. Melting of Pc, i started above 1350°C while melting of Pg, i above 1200°C. The mechanism of formation of core and shell, which were observed for both kinds of the pellets by heating for a certain time, was also discussed. Furthermore, heating experiments with electrolytic iron-coal char (pellet Pc, e) and electrolytic iron-graphite (pellet Pg, e) composite pellets in N2 and CO-10%CO2 were conducted to study the effect of gasification of carbon on melting of the iron. It is concluded that the gasification of carbon has a strong effect on the carburization by direct contact mechanism between iron and carbon, which finally determines the melting starting temperature of reduced iron.

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© The Iron and Steel Institute of Japan
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