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Analytical model for the swelling of sintered iron oxide pellets during the haematite-magnetite transformation

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Abstract

An analytical model for the swelling of sintered iron oxide pellets was developed, based on the variation of the elastic properties arising from the crystallographic and morphological changes that occur during a reduction reaction. The model is restricted to the haematite-magnetite transformation since this phase change was found to represent the largest overall volume increase of the reduction process. It is proposed that this swelling is the result of forces causing sequential fissurization of the bonds between the grains undergoing chemical and structural changes. The relative compressive strengths of the haematite and magnetite particles, the porosity and the pellet morphology are major parameters of the model. Equations of swelling for topochemical and non-topochemical types of reduction are developed independently. The relative contribution of each type of reduction mechanism was found to depend on the effect of the additive agent in the pellet. The model was successfully tested by comparison with experimental swelling results for certain SiO2, Al2O3, CaO and MgO additions.

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Authors and Affiliations

  1. Ecole Nationale de I'Industrie Minière, Rabat, Morocco

    M. Jallouli

  2. Département de Génie métallurgie, Ecole Polytechnique, CP 6079, Succursale “A”, H3C 3A7, Montréal, Québec, Canada

    F. Ajersch

Authors
  1. M. Jallouli
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  2. F. Ajersch
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Jallouli, M., Ajersch, F. Analytical model for the swelling of sintered iron oxide pellets during the haematite-magnetite transformation. J Mater Sci 21, 3528–3538 (1986). https://doi.org/10.1007/BF02402999

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