Improvement of Sinter Strength and Reducibility through Promotion of Magnetite Ore Oxidation by Use of Separate Granulating Method
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- Matsumura Masaru
- Technical Research&Development Bureau, Nippon Steel Corporation
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- Takayama Toru
- Technical Research&Development Bureau, Nippon Steel Corporation
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- Hara Kyosuke
- Technical Research&Development Bureau, Nippon Steel Corporation
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- Yamaguchi Yasuhide
- Technical Research&Development Bureau, Nippon Steel Corporation
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- Ishiyama Osamu
- Technical Research&Development Bureau, Nippon Steel Corporation
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- Higuchi Kenichi
- Technical Research&Development Bureau, Nippon Steel Corporation
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- Nomura Seiji
- Technical Research&Development Bureau, Nippon Steel Corporation
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- Murakami Taichi
- Graduate School of Environmental Studies, Tohoku University
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- Hayashi Miyuki
- Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
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- Ohno Ko-ichiro
- Department of Material Science and Engineering, Kyushu University
Abstract
<p>In general, Fe content in iron ore is gradually decreasing. This fact affects worse performance of BF operation, for example, increase of RAR and Slag ratio. Depletion of high grade iron ore deposits is moving us to use concentrates in sintering process.</p><p>Through magnetite concentration deteriorates reducibility because of high FeO content in sinter product. Such situation makes it to promote oxidation of magnetite iron ore during sintering process for improving sinter reducibility. In addition, promoting oxidation of magnetite possibly increases sinter strength with using oxidation heat.</p><p>ISIJ sinter research group for utilization of magnetite concentration suggests that restricting melt formation is critical for promoting oxidation of magnetite concentration.</p><p>In this paper, It is confirmed that “Separate Granulation” has been examined to apply their suggestion by sinter pot test.</p><p>The main results obtained are described as follows:</p><p>(1) “Separate Granulation” in case that magnetite is pre-granulated with high Al2O3 iron ore without limestone and coke breeze resulted in decrease of FeO in sinter and improvement of both sinter reducibility and sinter strength.</p><p>(2) Sinter micro structure featured restriction of pore, low circle factor and small mineral texture, which supported that melting restriction worked during sintering.</p><p>(3) Magnetite decreased and hematite increased as sinter mineral, which corresponded with decrease of FeO content.</p><p>(4) These facts shown (1) to (3) concluded that “Separate Granulation” is effective to improve both sinter reducibility and sinter strength due to restriction of melting during sinter reaction.</p>
Journal
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- ISIJ International
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ISIJ International 59 (5), 768-777, 2019-05-15
The Iron and Steel Institute of Japan
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Details 詳細情報について
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- CRID
- 1390845713068727680
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- NII Article ID
- 130007650344
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- ISSN
- 13475460
- 09151559
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed