Journal
ISIJ INTERNATIONAL
Volume 41, Issue 8, Pages 818-826Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.41.818
Keywords
coupling reaction; coupling phenomenon; iron ore reduction; gasification; mechanism of reduction
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Recently, the reaction of composite pellet consisting of the iron ore and carbonaceous materials such as coal, char and coke was investigated. The fast reaction rate and relatively low starting temperature were reported by many researchers. in such a reaction condition, the mechanism of reaction will be changed during reaction from the situation that the iron ore and carbon are directly contacting and to the separate situation. The simultaneous reaction between reduction and gasification of carbon was examined using hematite-graphite facing pair, which is to clarify the effect of reaction occurring in the separated place. From the definition of coupling phenomenon, the discussion about the 'produced energy' related to the production of entropy was carried out in view point of two aspects that were (a) the gas composition change and (b) the evolution of reaction heat. The starting temperature of gasification decreased from 900 degreesC to 600 degreesC in the facing pair under CO2 atmosphere and to 250 degreesC under CO atmosphere. The effect of reaction heat of reduction was measured and discussed through new mechanism of reduction.
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