Biotar Ironmaking Using Wooden Biomass and Nano-Porous Iron Ore
This paper describes fundamental experiments of a new biomass ironmaking that uses low-grade iron ore and woody biomass for promoting the direct reduction, FeO+C=Fe+CO, in which dehydrated, porous limonite iron ore was filled with carbon deposited from the biomass tar; Biotar. In our experiments, three types of iron ores containing different amounts of combined water (CW: 1.6, 3.8, 9.0 mass%) were first dehydrated at 450 ℃ to make them porous. Then, pine tree biomass was heated at 500 ℃ for the pyrolysis and the generated Biotar was decomposed to deposit carbon within/on the porous ores. The dehydration treatment made the iron ores porous by removing CW and their BET specific surface areas and porosities significantly increased. In the second treatment of biomass pyrolysis and decomposition of Biotar, the biomass was converted into char, Biotar, and reducing gas. Interestingly, the porous ores caught Biotar effectively, not only on the surface but also inside their pores. Here, the ores with the nano-sized pores served as catalysts for tar carbonization with gas generation; hydrogen, carbon monoxide and methane. Simultaneously, the ores were partially reduced to magnetite by the reducing gas and Biotar decomposition. The ores containing deposited carbon were reduced to FeO and iron by only heating until 900 ℃ in an inert atmosphere; this was due to the direct contact of carbon and iron oxide within the ores, so-called direct reduction. In conclusion, the dehydrated limonite iron ore was most effective for avoiding the generation of Biotar generated by the biomass pyrolysis and for filling the porous ore with carbon from Biotar. The product is a promising raw material for biomass ironmaking. The results were enticed as an innovative ironmaking method with large reduction of carbon-dioxide emission using low-grade iron ore and woody biomass.
ironmaking biomass tar iron ore, direct reduction goethite pine tree nano-pore
Kosuke Matsui Yuichi Hata Sou Hosokai Jun-Ichiro Hayashi Yoshiaki Kashiwaya Tomohiro Akiyama
Center for Advanced Research of Energy Conversion Materials: Kita 13 Nishi 8, Kita-ku, Sapporo, 060- Institute for Materials Chemistry and Engineering, Kyushu University Graduate School of Energy Science, Kyoto University
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
1297-1301
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）