کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7710421 1497403 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Kinetics of hydrogen reduction of magnetite ore fines
ترجمه فارسی عنوان
سینتیک کاهش هیدروژن جت سنگ معدن مگنتیت
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
The current work deals with the production of iron by the hydrogen reduction of magnetite ore fines in a thermogravimetric analyzer (TGA). The variables studied were time (0-30 min), temperature (973-1273 K), hydrogen flow rate (0.1-0.5 L min−1), hydrogen partial pressure (0.25-1 atm), sample bed height (0.25-0.75 cm) and particle size (75-180 μm). Phase identification, chemical analysis and elemental analysis were carried out by X-ray diffraction (XRD), X-ray fluorescence (XRF) analysis and energy-dispersive X-ray spectroscopy (EDS) of the scanning electron microscopic (SEM) images, respectively. The governing rate equations for the gas-solid reaction in a cylindrical/rectangular powder bed system with reacting gas flowing over the solid were used. Consistent with the thermodynamic prediction, the experimental results showed that the reduction of magnetite fines took place in two stages: Fe3O4 to FeO and FeO to Fe. Each stage was controlled by pore diffusion kinetics. The activation energies in the two stages were found to be 42 kJ mol−1 and 55 kJ mol−1, respectively. The fractional reduction of magnetite in the ore went up to 1.0. In addition to the kinetic study, the thermodynamics of the hydrogen reduction of magnetite (Fe3O4) is discussed briefly, giving the theoretical efficiency of hydrogen utilization in the reduction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 41, Issue 22, 15 June 2016, Pages 9256-9266
نویسندگان
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