Kinetics of Isothermal Reduction of MgO with Al
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概要
- 論文の詳細を見る
Isothermal reduction of magnesium oxide with aluminum was carried out by use of an insertion tube charged with pellets composed of magnesium oxide and aluminum powders. Since the temperature in the tube increased rapidly during inserting the tube into a high temperature zone in the graphite crucible and decreased quickly during lifting up the tube to a low temperature zone, the isothermal reduction condition was essentially satisfied by the present method.The reduction rate was increased with increasing temperature, carrier gas flow rate and pellet forming pressure. Even a little carrier gas could greatly increase the reduction rate of magnesium oxide.The XRD patterns of pellets at different reduction stages confirmed that the aluminothermic reduction of magnesium oxide can be roughly classified into two stages. At the first stage, spinel, alumina and magnesium vapor were mainly produced; at the second stage, the spinel was further reduced by aluminum to produce alumina and magnesium vapor and the excessively added magnesium oxide was also reduced.A kinetic model is established to describe the reduction rate of magnesium oxide. The apparent rate constant in the kinetic model increases with increasing temperature, carrier gas flow rate and pellet forming pressure. The apparent activation energy of the reduction is determined to be 109 kJ/mol.
- 社団法人 日本鉄鋼協会の論文
- 2006-08-15
著者
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SAWADA Takashi
Department of Knowledge-based Information Engineering, Toyohashi University of Technology
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Yang Jian
Department of Electronic Engineering, Tsinghua University
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Yang J
Department Of Materials Physics And Energy Engineering Graduate School Of Engineering Nagoya Univers
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Yang J
Tsinghua Univ. Beijing Chn
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Yang Jian
Nagoya Univ. Nagoya Jpn
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Kuwabara Mamoru
Department of Materials, Physics and Energy Engineering, Gradurate School of Engineering, Nagoya Uni
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Yang Jian
Department Of Materials Physics And Energy Engineering Graduate School Of Engineering Nagoya Univers
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Kuwabara Mamoru
Dept. of Materials, Physics and Energy Eng. Nagoya Univ.
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SANO Masamichi
Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya Univ
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Yang Jian
Graduate School Of Engineering Nagoya University
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Sawada Takashi
Department Of Knowledge-based Information Engineering Toyohashi University Of Technology
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Sawada Takashi
Department Of Materials Physics And Energy Engineering Graduate School Of Engineering Nagoya Univers
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Sano Masamichi
Department Of Materials Physics And Energy Engineering Graduate School Of Engineering Nagoya Univers
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Sano M
School Of Engineering Nagoya University
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Yang Jian
Department Of Cardiology Renmin Hospital Of Wuhan University
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Kuwabara Mamoru
Shougang Res. Inst. Of Technol.
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Kuwabara Mamoru
Department Of Materials Physics And Energy Engineering Graduate School Of Engineering Nagoya Univers
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Yang Jian
Department Of Cardiology Daping Hospital The Third Military Medical University
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Yang J
Department Of Materials Physics And Energy Engineering Graduate School Of Engineering Nagoya Univers
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Yang Jian
Department Of Anesthesiology University Of Florida College Of Medicine
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Sawada Takashi
Department of Chemistry, Nagaoka University of Technology, Nagaoka 940-2188, Japan
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