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| 1 | Staged reaction kinetics and characteristics of iron oxide direct reduction by carbon显示文摘Staged reduction kinetics and characteristics of iron oxide direct reduction by carbon were studied in this work. The characteristics were investigated by simultaneous thermogravimetric analysis, X-ray diffraction(XRD), and quadrupole mass spectrometry. The kinetics parameters of the reduction stages were obtained by isoconversional(model-free) methods. Three stages in the reduction are Fe_2O_3→Fe_3O_4, Fe_3O_4→Fe O, and Fe O→Fe, which start at 912 K, 1255 K, and 1397 K, respectively. The CO content in the evolved gas is lower than the CO_2 content in the Fe_2O_3→Fe_3O_4 stage but is substantially greater than the CO2 contents in the Fe_3O_4→Fe O and Fe O→Fe stages, where gasification starts at approximately 1205 K. The activation energy(E) of the three stages are 126–309 k J/mol, 628 k J/mol, and 648 k J/mol, respectively. The restrictive step of the total reduction is Fe O→Fe. If the rate of the total reduction is to be improved, the rate of the Fe O→Fe reduction should be improved first. The activation energy of the first stage is much lower than those of the latter two stages because of carbon gasification. Carbon gasification and FexOy reduction by CO, which are the restrictive step in the last two stages, require further study. | Ru-fei Wei Da-qiang Cang Ling-ling Zhang Yuan-yuan Bai | 2015 | International Journal of Minerals,Metallurgy and Materials2015，22，10： | 3 |
| 2 | 用热分解法从CdCO_3前驱体制备CdO纳米颗粒的反应路径和反应动力学(英文)显示文摘研究用热分解法从CdCO_3前驱体制备CdO纳米颗粒的非等温动力学。采用Malek模型模拟法和改进的非模型等转化率Vyazovkin法对所得DSC和TDA数据进行分析。结果表明,从CdCO_3制备CdO纳米颗粒的反应属于自动催化反应。Sestak-Berggren模型能很好地描述该反应过程。另外,计算得到CdCO_3热分解反应的表观活化能为(119.19±9.97)kJ/mol,并建立了该热分解反应的反应速率方程。 | Gholam Reza KHAYATI Seyed Hadi SHAHCHERAGHI Vahid LOTFI Esmael DAREZARESHKI | 2016 | Transactions of Nonferrous Metals Society of China2016，26，4： | 0 |
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