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首页> 外文会议>International Conference on Alternative Routes of Iron and Steelmaking ICARISM'99, Sep 15-17, 1997, Perth, WA >Measurement of Phase Transformation Rates During the Reduction of Iron Oxides Using High-Temperature X-ray Diffraction
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Measurement of Phase Transformation Rates During the Reduction of Iron Oxides Using High-Temperature X-ray Diffraction

机译：使用高温X射线衍射测量氧化铁还原过程中的相变速率

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摘要

Recent advances in X-ray diffraction (XRD) technology have made it possible to conduct powder XRD measurements on samples at high temperatures during reaction. State-of-the-art detectors are now capable of rapidly acquiring diffraction patterns across a wide angular range (typically 120°2θ) enabling phase transformation rates to be measured directly during sample reaction. In this study, the phase transformations during the reduction of hematite to metallic iron by five per cent hydrogen in nitrogen gas mixtures, were measured in situ between 500 - 700 ℃.Complete X-ray diffraction patterns were acquired within 15 seconds every one minute, enabling direct measurement of the transient phase abundances during the reaction. The data were quantitatively analysed by the Rietveld method to yield the abundances of hematite, magnetite, wustite and metallic iron, as functions of time during the reduction process. A first-order reactions-in-series model was proposed, and the reaction rate constants and activation energy were determined from the time-dependent phase abundance data.
机译：X射线衍射（XRD）技术的最新进展使在反应过程中对样品进行粉末XRD测量成为可能。现在，最先进的检测器能够在宽角度范围（通常为120°2θ）内快速获取衍射图样，从而可以在样品反应过程中直接测量相变速率。在这项研究中，在500-700℃之间原位测量了在5％的氢气混合物中由5％氢气将赤铁矿还原为金属铁的相变。每1分钟在15秒内获得了完整的X射线衍射图，可以直接测量反应过程中的瞬态相丰度。通过Rietveld方法对数据进行定量分析，得出还原过程中随时间变化的赤铁矿，磁铁矿，钙铁矿和金属铁的丰度。提出了一级反应串联模型，并根据随时间变化的相丰度数据确定了反应速率常数和活化能。

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