Reaction Behavior of Facing Pair Between Hematite and Graphite: A Coupling Phenomenon of Reduction and Gasification
Reaction Behavior of Facing Pair Between Hematite and Graphite: A Coupling Phenomenon of Reduction and Gasification
复制标题
赤铁矿与石墨面对的反应行为：还原与气化的耦合现象
DOI：
10.2355/isijinternational.41.818
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发表时间：
2001
影响因子：
1.8
通讯作者：
K. Ishii
中科院分区：
文献类型：
--
作者：
Y. Kashiwaya;Motomichi Kanbe;K. Ishii
近年来，人们对铁矿石与煤、半焦、焦炭等含碳物料组成的复合球团反应进行了研究。许多研究者报道了快速的反应速率和相对较低的起始温度。在这样的反应条件下，反应机理在反应过程中将从铁矿石与碳直接接触的情况转变为分离的情况。为了阐明碳的还原和气化反应在分离位置发生的影响，用赤铁矿-石墨对对同时进行的反应进行了研究。从耦合现象的定义出发，从气体组成变化和反应热的放出两个方面讨论了与熵产生有关的“产生能”。在CO2气氛下，气化起始温度从900°C降至600°C，在CO气氛下降至250°C。测定了还原反应热的影响，并通过新的还原机理进行了讨论。
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°C to 600°C in the facing pair under CO 2 atmosphere and to 250°C under CO atmosphere. The effect of reaction heat of reduction was measured and discussed through new mechanism of reduction.