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通过原位观察和同步热分析的方式,研究气固两相界面还原反应时金属铁析出形态、矿相结构演变过程,明确金属铁的析出形态与显微结构、黏结特性之间的关系。结果表明,CO气氛下Fe2O3还原时金属铁主要以纤维状生成的铁晶须为主,还原速率是决定这种形态差异的主要原因;在Fe2O3→Fe3O4→FeO中只会因晶格转变产生体积大小变化,且伴有裂纹和孔洞的发生,没有铁晶须生成;在FeO→Fe中出现铁晶须形核和生长,且铁晶须是100%的纯金属铁。要避免铁晶须生成,就要在FeO→Fe转变时抑制铁原子的定向迁移。
By means of in-situ observation and simultaneous thermal analysis, the precipitation state of metallic iron and the evolution of mineral structure during the reduction reaction at gas-solid interface were studied. The relationship between precipitation morphology and microstructure and bonding properties of metallic iron was clarified. The results show that the ferrous whiskers mainly formed by fibrous fibers are mainly dominated by Fe2O3 reduction in CO atmosphere, and the reduction rate is the main reason that determines the morphological difference. In Fe2O3 → Fe3O4 → FeO, only the volume of ferrite Size changes accompanied by the occurrence of cracks and holes without the formation of ferrite whiskers. Ferrite whiskers nucleate and grow in FeO → Fe, and the ferrite whiskers are 100% pure metallic iron. To avoid the formation of iron whiskers, it is necessary to inhibit the directional migration of iron atoms during the transition of FeO → Fe.