石炭チャーあるいは黒鉛を混合した鉄鉱石ペレット加熱時の還元・浸炭・溶融挙動

概要

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Reactions in iron ore-coal char composite pellets heated in nitrogen atmosphere at temperatures between 1100℃ and 1350℃ were investigated. Coarsening and melting of reduced iron particles through their carburization were furthermore investigated for iron ore-coal char (pellet P_<c, i>) and iron ore-graphite (pellet P_<g, i>) composite pellets. Direct carburizaiton of iron in contact with carbon is superior to indirect carburization through gas phase. Melting of P_<c, i> started above 1350℃ while melting of P_<g, i> above 1200℃. 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 P_<c, e>) and electrolytic iron-graphite (pellet P_<g, e>) composite pellets in N_2 and CO-10%CO_2 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.
社団法人日本鉄鋼協会の論文