Biotar ironmaking using wooden biomass and nano-porous iron ore

Kosuke Matsui, Yuichi Hata, Sou Hosokai, Hayashi Jun-Ichiro, Yoshiaki Kashiwaya, Tomohiro Akiyama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)


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 °C to make them porous. Then, pine tree biomass was heated at 500 °C 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 CWand 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.

Original languageEnglish
Title of host publication5th International Congress on the Science and Technology of Ironmaking, ICSTI 2009
Number of pages5
Publication statusPublished - 2009
Event5th International Congress on the Science and Technology of Ironmaking, ICSTI 2009 - Shanghai, China
Duration: Oct 20 2009Oct 22 2009


Other5th International Congress on the Science and Technology of Ironmaking, ICSTI 2009

All Science Journal Classification (ASJC) codes

  • Metals and Alloys


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