Kinetic Study on the Reduction Reaction of Biomass-Tar-Infiltrated Iron Ore

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• 作者：Sou Hosokai ; Kosuke Matsui ; Noriyuki Okinaka ; Ko-ichiro Ohno ; Masakata Shimizu ; Tomohiro Akiyama
• 刊名：Energy & Fuels
• 出版年：2012
• 出版时间：December 20, 2012
• 年：2012
• 卷：26
• 期：12
• 页码：7274-7279
• 全文大小：303K
• 年卷期：v.26,no.12(December 20, 2012)
• ISSN：1520-5029

文摘

This work describes a new biomass ironmaking that uses low-grade iron ore and woody biomass for promoting the direct reduction of a nanoporous iron ore infiltrated and carbonized with biomass tar (biotar). The mechanism and kinetics of the reduction reaction of the carbon-infiltrated ore were systematically studied by means of thermogravimetric analysis with X-ray diffraction (XRD) and Raman scattering spectrometry. The results showed that the carbon-infiltrated ore reduced at a significantly lower temperature than the mixture of reagent magnetite and metallurgical coke. It was confirmed that this high reactivity was due to the nanoscale contact between carbon and the ore and the less fused and less cross-linked nature of the biotar-derived carbon. From the combination of thermogravimetry and XRD analyses, it is revealed that the reduction reaction occurred serially in three steps: re-evaporation and/or carbonization of biotar, reduction of magnetite to w眉stite, and reduction of w眉stite to iron. Finally, the kinetic parameters for each reaction were summarized by the Friedman鈥揙zawa method.