Enhancement of Reduction Rate of Iron Ore by Utilizing Low Grade Iron Ore and Brown Coal Derived Carbonaceous Materials

• Miura Kouichi

  Department of Chemical Engineering, Graduate School of Engineering, Kyoto University

• Miyabayashi Keisuke

  Department of Chemical Engineering, Graduate School of Engineering, Kyoto University

• Kawanari Masato

  Department of Chemical Engineering, Graduate School of Engineering, Kyoto University

• Ashida Ryuichi

  Department of Chemical Engineering, Graduate School of Engineering, Kyoto University

Abstract

The reduction rate of iron ore can be enhanced dramatically when iron ore/carbon composites (IOC) are prepared so as to maximize the interfacial area and to realize intimate contact between iron ore particles and carbon. An idea realizing this concept in practical blast furnace operation was proposed in this paper. Low grade iron ore that contains a large amount of goethite, FeOOH, was chosen as an iron ore, and brown coal derivative was chosen as a thermoplastic carbonaceous material for preparing IOC sample. Goethite, FeOOH, has layered structures combined by hydrogen bonds associated with OH groups. When FeOOH is heated up to 250 to 300°C, the OH groups are removed as H₂O, leaving flat pore spaces of 0.8 nm wide between 20 nm thick Fe₂O₃ layers. The pore spaces are, however, closed over 300°C by the sintering of the Fe₂O₃ layers. The idea proposed is to insert the thermoplastic carbonaceous material into the pore space of 0.8 nm wide while the pore spaces are opened and to carbonize it to form carbon in the pore space below 500°C. This IOC is expected to realize intimate contact between the Fe₂O₃ layers and the carbon, and to enhance the reduction rate of the Fe₂O₃ dramatically. The validity of this idea was verified by preparing IOC samples using reagent grade FeOOH and a thermoplastic resin. Then it was shown that the IOC sample prepared from a low grade iron ore, SF. Robe River, and a thermoplastic extract deriving from a brown coal can realize the idea practically.

Journal

• ISIJ International

  ISIJ International 51 (8), 1234-1239, 2011

  The Iron and Steel Institute of Japan

Keywords

• iron ore/carbon composite
• rapid reduction of iron ore
• low grade iron ore
• goethite
• brown coal extract
• thermoplastic carbon

Details

• CRID: 1390282681464297472
• NII Article ID: 130000968577
• DOI: 10.2355/isijinternational.51.1234
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational/51/8/51_8_1234/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed