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J. Korean Ceram. Soc. > Volume 52(5); 2015 > Article
Journal of the Korean Ceramic Society 2015;52(5): 389.
doi: https://doi.org/10.4191/kcers.2015.52.5.389
Phase Transition and Metalization of DRI According to the Quality of Iron Oxide
Young Min Yun, Jae Hyun Jung, Sung Kwan Seo, Yong Sik Chu
Energy & Environmental Div., Korea Institute of Ceramic Eng. & Tech
Direct reduced iron was made using an electric furnace. The reduction ratio of direct reduced iron varied depending on the grade of iron ore. Coal played an important role as a reducing agent in making the direct reduced iron. The coal must contain a suitable amount of volatile components having high calorie values and low impurity content. In this study, oxidized pellets were directly reduced using anthracite as a reductant in an electric furnace. Direct reduction behaviors of hematite and magnetite pellets were confirmed in a coal-based experiment. Reduction behaviors were demonstrated by analyzing the chemical compositions, measuring the reducibility, and observing the phase changes and microstructure. The superior reducibility of hematite pellets can be ascribed to their high effective diffusivity, which is due to their high porosity. The quickly after reducing for 40min and achieves a high value at the end of the reduction.
Key words: Direct reduced iron, Coal based reduction, Oxidized pellets
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