当前位置：
X-MOL 学术
›
J. Phys. Chem. C
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Influence of Preoxidation Treatment on the Reduction Behavior and Reaction Kinetics of Vanadium Titanomagnetite by Hydrogen
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2024-04-26 , DOI: 10.1021/acs.jpcc.4c01078 Jian Shi 1 , Qiang Xu 1 , Xuyang Lu 1 , Zeshui Cao 1 , Haopeng Kang 1 , Bin Chen 1 , Liejin Guo 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2024-04-26 , DOI: 10.1021/acs.jpcc.4c01078 Jian Shi 1 , Qiang Xu 1 , Xuyang Lu 1 , Zeshui Cao 1 , Haopeng Kang 1 , Bin Chen 1 , Liejin Guo 1
Affiliation
|
Hydrogen is a potential alternative reducing agent, which can greatly reduce CO2 emission in the ironmaking process of vanadium titanomagnetite. This paper investigated the reaction process and kinetic characteristics of the hydrogen reduction of both untreated and preoxidized vanadium titanomagnetite using a thermogravimetric analyzer (TG). The effects of different preoxidation temperatures (Toxi = 500 °C, Toxi = 700 °C, and Toxi = 900 °C) on the reduction characteristics of vanadium titanomagnetite were compared at a reduction temperature of 1000 °C. It was found that the reduction degree and reduction rate of low-temperature (Toxi = 500 °C and Toxi = 700 °C) preoxidized vanadium titanomagnetite are higher than those of high-temperature (Toxi = 900 °C) preoxidized vanadium titanomagnetite. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses show that the low-temperature preoxidation process separates the Fe/Ti in vanadium titanomagnetite and forms micropores on the surface of the vanadium titanomagnetite, while the high-temperature preoxidation process allows the separated hematite and ilmenite to recombine and form pseudobrookite. The isothermal reduction experiments on untreated and preoxidized vanadium titanomagnetite were carried out, with reduction temperatures ranging from 600 to 1000 °C. The obtained results were subjected to kinetic analysis using conventional model-fitting and iso-conversional methods. The fitting results of different kinetic models show that the activation energies of the preoxidized vanadium titanomagnetite reduction reaction are lower than those of untreated vanadium titanomagnetite. In the entire range of the reduction reaction, the contracting area model (R2) can best describe the reaction between hydrogen and untreated and preoxidized vanadium titanomagnetite. After the preoxidized treatment, the reduction energy barrier of vanadium titanomagnetite decreases by about 38.0%.
中文翻译：
预氧化处理对钒钛磁铁矿氢还原行为及反应动力学的影响
氢气是一种潜在的替代还原剂，可大大减少钒钛磁铁矿炼铁过程中CO 2 的排放。本文利用热重分析仪（TG）研究了未处理和预氧化钒钛磁铁矿的氢还原反应过程和动力学特征。在还原温度1000 ℃下，比较了不同预氧化温度（ T oxi = 500 ℃、T oxi = 700 ℃、T oxi = 900 ℃）对钒钛磁铁矿还原特性的影响。结果发现，低温（T oxi = 500 ℃和T oxi = 700 ℃）预氧化钒钛磁铁矿的还原度和还原率均高于高温（T oxi = 900 ℃）预氧化钒钛磁铁矿的还原度和还原率。钛磁铁矿。 X射线衍射（XRD）和扫描电子显微镜（SEM）分析表明，低温预氧化过程使钒钛磁铁矿中的Fe/Ti分离，并在钒钛磁铁矿表面形成微孔，而高温预氧化过程使得钒钛磁铁矿中的Fe/Ti分离，并在钒钛磁铁矿表面形成微孔。分离的赤铁矿和钛铁矿重新结合形成铁板钛矿。对未处理和预氧化的钒钛磁铁矿进行了等温还原实验，还原温度范围为600~1000 ℃。使用传统的模型拟合和等转换方法对所得结果进行动力学分析。不同动力学模型的拟合结果表明，预氧化后的钒钛磁铁矿还原反应的活化能低于未处理的钒钛磁铁矿。在整个还原反应范围内，收缩面积模型（R 2）最能描述氢气与未处理和预氧化的钒钛磁铁矿之间的反应。经过预氧化处理后，钒钛磁铁矿的还原能垒降低了约38.0%。
更新日期：2024-04-26
中文翻译：
预氧化处理对钒钛磁铁矿氢还原行为及反应动力学的影响
氢气是一种潜在的替代还原剂，可大大减少钒钛磁铁矿炼铁过程中CO 2 的排放。本文利用热重分析仪（TG）研究了未处理和预氧化钒钛磁铁矿的氢还原反应过程和动力学特征。在还原温度1000 ℃下，比较了不同预氧化温度（ T oxi = 500 ℃、T oxi = 700 ℃、T oxi = 900 ℃）对钒钛磁铁矿还原特性的影响。结果发现，低温（T oxi = 500 ℃和T oxi = 700 ℃）预氧化钒钛磁铁矿的还原度和还原率均高于高温（T oxi = 900 ℃）预氧化钒钛磁铁矿的还原度和还原率。钛磁铁矿。 X射线衍射（XRD）和扫描电子显微镜（SEM）分析表明，低温预氧化过程使钒钛磁铁矿中的Fe/Ti分离，并在钒钛磁铁矿表面形成微孔，而高温预氧化过程使得钒钛磁铁矿中的Fe/Ti分离，并在钒钛磁铁矿表面形成微孔。分离的赤铁矿和钛铁矿重新结合形成铁板钛矿。对未处理和预氧化的钒钛磁铁矿进行了等温还原实验，还原温度范围为600~1000 ℃。使用传统的模型拟合和等转换方法对所得结果进行动力学分析。不同动力学模型的拟合结果表明，预氧化后的钒钛磁铁矿还原反应的活化能低于未处理的钒钛磁铁矿。在整个还原反应范围内，收缩面积模型（R 2）最能描述氢气与未处理和预氧化的钒钛磁铁矿之间的反应。经过预氧化处理后，钒钛磁铁矿的还原能垒降低了约38.0%。
京公网安备 11010802027423号