Reaction Behavior of Coal Composite Iron Ore Hot Briquettes in a Laboratory Scale Blast Furnace Simulator
The coal composite iron ore hot briquette made by utilizing thermal plasticity of coal is recently developed as agglomerates without binder, which has several advantages to retain high density and strength during reaction at high temperatures. The charge of these briquettes to a blast furnace is expected to enable more effectively higher reaction rates at lower temperatures than usual operation. In this work, to elucidate influence of amounts of coal mixed in the briquettes on their reaction behavior in a blast furnace, several proportions of hot briquettes were prepared on the basis of the amount of coal with mole ratio C/O=1/1 in the briquettes. Then, self reaction and softening-melting tests of the briquettes were carried out in a N2 stream with heating from room temperature to 1400 ℃ in a laboratory scale blast furnace simulator. Both gasification of coal and reduction of iron ore during reaction were evaluated from weight loss and carbon content in the briquettes after reaction. The first order reaction rate constants for gasification and reduction increased and decreased with mole ratio Fe/C in briquettes, respectively. The briquettes having more coal than the base amount tended to melt down at the temperatures above 1300℃ due to carburization to metallic iron by remained carbon, which served as aggregates, leading to less shrinkage of the briquettes before metal melting. The briquettes having less coal than the base amount tended to begin rapid shrinkage with softening at lower temperatures around 1050℃ due to melting of slag containing unreduced FeO and proceed further shrinkage with higher temperatures. The results will be overall discussed with the viewpoint of a feasible utilization of these briquettes to a blast furnace.
coal composite iron ore hot briquette influence ofcoal proportions with iron ore laboratory scale blast furnace simulator blast furnace sustainable society
Shoji Hayashi
Graduate School of Materials Engineering, Nagoya Institute of Technology,Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan
国际会议
The 5th International Congress on the Science and Technology of Ironmaking(第五届国际炼铁科技大会 ICSTI09)
上海
英文
426-430
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）