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Dehydration Behavior of Goethite Blended with Graphite by Microwave Heating

机译：微波加热针铁矿与石墨共混物的脱水行为

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摘要

In ironmaking and steelmaking processes, dehydration of wet substances and minerals combined by H_2O 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.
机译：在炼铁和炼钢过程中，通常认为湿物质和矿物质与H_2O结合脱水是稳定操作的关键。本研究旨在通过模拟干燥湿污泥和贫铁矿结合水的微波处理，了解针铁矿与石墨混合的脱水行为。首先，将具有各种条件的混合样品（粉末状或颗粒状）通过微波设备加热。针铁矿的脱水速率随温度升高而增加。确认造粒的Denser样品加热整个零件的效率较低。发现过量添加石墨降低了脱水速率的效率。因此，据估计，FeO（OH）：C的混合比为1：1的具有较少量石墨的样品在石墨颗粒之间具有足够大的距离，微波可以通过该距离充分地渗透到样品的核中。为了证明这一假设，Network Analyzer通过测量介电常数帮助评估了微波的穿透深度。测量结果表明，渗透深度随表观密度的增加而降低，与微波处理的加热行为一致。然而，在FeO（OH）：C的混合比为1：2的情况下，估计样品的行为就像在渗滤状态下一样。

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  • 来源
    《ISIJ international》 |2011年第6期|p.878-883|共6页
  • 作者

    Youichi SAITO; Keita KAWAHIRA; Noboru YOSHIKAWA; Hidekazu TODOROKI; Shoji TANIGUCHI;

  • 作者单位

    Nippon Yakin Kogyo Co., Ltd., Technical Research Center, formerly Student, Tohoku University, 6-6-02, Aza-Aoba, Aramaki,Aoba-ku, Sendai, 980-8579 Japan;

    Graduate School of Environmental Studies, Tohoku University, 6-6-02, Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8579 Japan;

    Graduate School of Environmental Studies, Tohoku University, 6-6-02, Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8579 Japan;

    Nippon Yakin Kogyo Co., Ltd., Technical Research Center, 4-2 Kojima-cho, Kawasaki-ku, Kawasaki, 210-8558 Japan;

    Graduate School of Environmental Studies, Tohoku University, 6-6-02, Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8579 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    microwave; goethite; graphite; decomposition; dehydration; permittivity; permeability; network analyzer.;

    机译：微波;针铁矿石墨;分解;脱水介电常数渗透性网络分析仪。;

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