Dehydration Behavior of Goethite Blended with Graphite by Microwave Heating
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概要
- 論文の詳細を見る
In ironmaking and steelmaking processes, dehydration of wet substances and minerals combined by H2O are often recognized to be a key to stable practices. This study aims at understanding dehydration behavior of goethite blended with graphite by microwave treatment simulating drying wet sludge and poor iron ore with combined water.Firstly blend specimens with various conditions, powdery or pelletized, were heated by microwave apparatus. Dehydration rate of goethite increased with increasing temperature. Denser specimen of pelletized was confirmed to be less effective to heat up the whole part. It was found that surplus addition of graphite decreased efficiency in dehydration rate. Thus, it was estimated that a specimen with smaller amount of graphite, whose blend ratio of FeO(OH):C was 1:1, had sufficiently larger distance between graphite particles, through which microwaves could adequately penetrate into the core of the specimen. To prove this hypothesis, Network Analyzer helped evaluate penetration depth of microwave by the measurement of permittivity. The measured results showed that penetration depth decreased with increasing apparent density consistently with the heating behavior by microwave treatment. At the blend ratio of 1:2 of FeO(OH):C, however, the specimen was estimated to behave as if it was under percolation.
- The Iron and Steel Institute of Japanの論文
- 2011-06-15
著者
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Taniguchi Shoji
Graduate School Of Engineering Tohoku University
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Sasaki You
Tohoku University
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Yoshikawa Noboru
Graduate School Of Environmental Studies Tohoku University
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Todoroki Hidekazu
Technical Res. Centre Nippon Yakin Kogyo Co. Ltd.
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Todoroki Hidekazu
Nippon Yakin Kogyo Co. Ltd. Technical Research Center
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Kawahira Keita
Graduate School Of Environmental Studies Tohoku University
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SAITO Youichi
Nippon Yakin Kogyo Co., Ltd., Technical Research Center
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