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首页> 外文期刊>ISIJ international >Flash Suspension Reduction of Ultra-fine Fe_2O_3 Powders and the Kinetic Analyzing
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Flash Suspension Reduction of Ultra-fine Fe_2O_3 Powders and the Kinetic Analyzing

机译：超细Fe_2O_3粉末的闪悬浮还原及其动力学分析。

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摘要

In order to take the advantage of the large reaction surface of fine iron ore concentrates and expect a high reaction rate without sticking or agglomeration problems, a suspension gas-solid reaction system was designed to explore the feasibility of fast direct reduction of fine iron ore. In this study, upward gas flow was used to prolong the particles' falling time. Pure silica particles were chosen as the dispersion agent. The Stokes gas-particle model with the relaxation time concept was applied to accurately model the falling process. Highly metallized porous iron particles over 90% of R_d (reduction degree) were obtained at 1 273 K with 20.1 s of hydrogen reduction. The morphology evolution characteristics of the fine particles during reduction were investigated via SEM, and a conceptual diagram was formulated in this paper in order to well understand the relationship between the reduction condition and the structural evolution. The shrinking core model was introduced to analyzing the reduction kinetics in this experiment system, which indicates that the microstructure evolution of the particle during reduction can be influenced by temperature and the resistance of internal mass transfer cannot be ignored under this experiment condition especially in the later stage of reduction.
机译：为了利用细铁矿精矿的大反应表面并期望高反应速率而不会出现粘着或结块的问题，设计了悬浮气固反应系统，以探索快速直接还原细铁矿的可行性。在这项研究中，向上的气流被用来延长颗粒的下落时间。选择纯二氧化硅颗粒作为分散剂。应用具有松弛时间概念的斯托克斯气体颗粒模型来精确地模拟下落过程。在1273 K和20.1 s的氢还原下，获得了R_d（还原度）超过90％的高度金属化的多孔铁颗粒。通过SEM研究了还原过程中细颗粒的形貌演变特征，并绘制了概念图以更好地了解还原条件与结构演变之间的关系。在实验系统中引入了收缩核模型来分析还原动力学，这表明还原过程中颗粒的微观结构会受到温度的影响，并且在此实验条件下，内部传质的阻力不容忽视，特别是在后期。减少阶段。

著录项

  • 来源
    《ISIJ international》 |2015年第9期|1797-1805|共9页
  • 作者

    Lei GUO; Jintao GAO; Yiwei ZHONG; Zhancheng GUO;

  • 作者单位

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083 China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083 China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083 China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083 China;

  • 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

    ultra-fine iron powers; flash reduction; suspension; gas-solid flow; sticking/agglomeration;

    机译：超细铁力量;减少闪光悬挂;气固流粘着/结块;

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