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首页> 外文会议>Proceedings of the 3rd Pan American materials congress >Reduction Kinetics and Characterization Study of Synthetic Magnetite Micro Fines
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Reduction Kinetics and Characterization Study of Synthetic Magnetite Micro Fines

机译：合成磁铁矿微粉的还原动力学及表征研究

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摘要

The present work deals with the characterization of pure magnetite microfines (<5 μm) and its hydrogen reduction. The structural and morphological properties of magnetite powder were analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption analysis by five points isotherm BET method, and scanning electron microscopy along with energy dispersive X-ray spectroscopy (SEM-EDS). The hydrogen reduction of the magnetite powder was carried out in a thermo-gravimetric analyzer (TGA) under a steady flow of hydrogen or hydrogen-argon mixture (to produce different partial pressures of hydrogen). The variables studied were reduction temperature (973-1273 K), hydrogen partial pressure (0.25-1 atm) and sample bed height (0.184-0.68 cm). The apparent activation energy was obtained as 22 kJ mol~(-1). The rate equations developed for the reaction system under study were applied to determine the rate controlling step. The reduction was found to be rate controlled by diffusion through the stagnant gas film enclosed above the sample inside the crucible. The true activation energy was calculated to be 9 kJ mol~(-1).
机译：本工作涉及纯磁铁矿超细颗粒（<5μm）的表征及其氢还原。通过X射线衍射（XRD），X射线光电子能谱（XPS），傅里叶变换红外光谱（FTIR），五点等温BET法对氮的吸附分析和扫描电子显微镜分析了磁铁矿粉的结构和形貌特性以及能量色散X射线光谱（SEM-EDS）。磁铁矿粉末的氢还原反应是在热重分析仪（TGA）中在氢气或氢气-氩气混合物的稳定流量下进行的（以产生不同的氢气分压）。研究的变量是还原温度（973-1273 K），氢分压（0.25-1 atm）和样品床高度（0.184-0.68 cm）。表观活化能为22 kJ mol〜（-1）。为研究中的反应系统开发的速率方程式用于确定速率控制步骤。发现减少是由通过坩埚内样品上方封闭的停滞气体膜的扩散来控制的。真实的活化能经计算为9 kJ mol〜（-1）。

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  • 会议地点 San Diego(US)
  • 作者

    Saikat Kumar Kuila; Ritayan Chatterjee; Dinabandhu Ghosh;

  • 作者单位

    Department of Metallurgical and Materials Engineering,Jadavpur University, Kolkata 700032, India,Department of Metallurgical and Materials Engineering,Indian Institute of Technology, Kharagpur 721302, West Bengal, India;

    Department of Metallurgical and Materials Engineering,Indian Institute of Technology, Kharagpur 721302, West Bengal, India,Department of Applied Sciences,Haldia Institute of Technology, Haldia 721657, West Bengal, India;

    Department of Metallurgical and Materials Engineering,Jadavpur University, Kolkata 700032, India;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Magnetite fines; Characterization; Hydrogen reduction; Activation energy;

    机译：磁铁矿罚款；表征；氢还原；活化能;

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