A laboratory study of the reduction of iron oxides by hydrogen
| Autor: | Wagner, D., Devisme, O., Patisson, F., Ablitzer, D. |
|---|---|
| Přispěvatelé: | Laboratoire de Science et Génie des Matériaux et de Métallurgie (LSG2M), Université Henri Poincaré - Nancy 1 (UHP)-Institut National Polytechnique de Lorraine (INPL)-Centre National de la Recherche Scientifique (CNRS), F. Kongoli and R.G. Reddy |
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Condensed Matter - Materials Science
iron oxide mechanisms kinetics hydrogen thermobalance [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering [CHIM.MATE]Chemical Sciences/Material chemistry Reduction |
| Zdroj: | Advanced processing of metals and materials Sohn International Symposium Sohn International Symposium, Aug 2006, San Diego, United States. pp.111-120 |
| Popis: | International audience; To reduce the emission of greenhouse gases by the steel industry, particularly for ironmaking, the production of DRI (Direct Reduced Iron) using hydrogen as the reducing gas instead of carbon monoxide is being considered. In this context, the reduction of pure hematite by hydrogen was studied at the laboratory scale, varying the experimental conditions and observing the rate and the course of the reaction. All the reduction experiments were performed in a thermobalance and supplementary characterization methods were used like scanning and transmission electron microscopy, X-ray diffraction, and Mössbauer spectrometry. The influence of rising temperature in the range 550-900°C is to accelerate the reaction; no slowing down was observed, contrary to some literature conclusions. A series of experiments consisted in interrupting the runs before complete conversion, thus enabling the characterization of partially reduced samples. Interpretation confirms the occurrence of three successive and rather separate reduction steps, through magnetite and wustite to iron, and illustrates a clear structural evolution of the samples. Finally, the influence of the sample type was revealed comparing a regular powder, a nanopowder and a sintered sample. The regular powder proved to be the most reactive despite its larger grain size, due to a more porous final structure. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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