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Jianliang Zhang, Yang Li, Zhengjian Liu, Tengfei Wang, Yaozu Wang, Kejiang Li, Guilin Wang, Tao Xu, and Yong Zhang, Isothermal kinetic analysis on reduction of solid/liquid wustite by hydrogen, Int. J. Miner. Metall. Mater.,(2022). https://doi.org/10.1007/s12613-022-2518-0
Cite this article as:
Jianliang Zhang, Yang Li, Zhengjian Liu, Tengfei Wang, Yaozu Wang, Kejiang Li, Guilin Wang, Tao Xu, and Yong Zhang, Isothermal kinetic analysis on reduction of solid/liquid wustite by hydrogen, Int. J. Miner. Metall. Mater.,(2022). https://doi.org/10.1007/s12613-022-2518-0
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研究论文

氢气还原固/液态浮氏体等温动力学研究

  • 通讯作者:

    刘征建    E-mail: liuzhengjian@ustb.edu.cn

    王耀祖    E-mail: wgyozu@163.com

文章亮点

  • (1) 系统研究了纯H2与FeO在FeO–Fe体系分别为全固态和全熔融态时的等温还原规律。
  • (2) 明晰了纯H2等温还原FeO在气–固和气–液两种反应体系的反应动力学特征及差异。
  • (3) 解析了纯H2分别还原液态浮氏体时的动力学模型。
  • 优化传统炼铁工序能源结构,实现炼铁工序低碳、绿色发展是当前钢铁行业亟待解决的问题。近年来,熔融还原炼铁工艺取得了长足的进步,发展氢基熔融还原炼铁工艺为实现低碳炼铁提供了新的可能性。相比于氢气还原固态浮氏体的研究而言,关于氢气还原液态浮氏体的研究(即气-液反应过程)尚不充分。因此,本文采用热重实验的方法对纯氢气还原固态和液态浮氏体的反应过程进行了研究。研究结果表明,反应物浮氏体和产物金属铁的物相状态对终还原转化率影响不大,均可完全还原,但当浮氏体和金属铁均为液态时的化学反应条件优于二者均为固态时,其反应速度更快。动力学模型拟合结果表明,纯氢气还原固态和液态浮氏体的反应过程均符合幂函数法则模型(Mampel Power,n = 1/2)。通过等转化率法对还原过程表观活化能进行了计算,当反应物浮氏体和产物金属铁均为固态时,平均表观活化能为5.85 kJ·mol−1;二者均为液态时,平均表观活化能为104.74 kJ·mol−1。可见当反应物浮氏体和产物金属铁均为液态时,还原反应发生所需能量明显增大,但此时反应速率变快。
  • Research Article

    Isothermal kinetic analysis on reduction of solid/liquid wustite by hydrogen

    + Author Affiliations
    • Iso-thermal thermogravimetric analysis was used to study the reduction process of solid/liquid wustite by hydrogen. Results show that wustite in both states can be reduced entirely at all temperatures. The thermal and kinetic conditions for the hydrogen reduction of molten phases are better than those when the reactants and products are in the solid state, with a higher reaction rate. The hydrogen reduction of different wustite phases fits the Mampel Power model (power exponent n = 1/2) well, and this model is independent of the phase state. The average apparent activation energies of the reduction process calculated by the iso-conversional method are 5.85 kJ·mol−1 and 104.74 kJ·mol−1, when both reactants and products are in the solid state and the molten state, respectively. These values generally agree with those calculated by the model fitting method.
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