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Iron Ores Behavior and Phase Relationships During Sintering Processes (Keynote Lecture) The 4th International Congress on the Science and Technology of Ironmaking 2006 , Osaka, Japan
Ian McBow¹ ; S. Llubani ¹; Florian Kongoli ¹;
¹FLOGEN Technologies Inc,1255 Laird Blvd., Ste.388, Mont-Royal, Quebec, Canada

Keywords: iron ore, phase relationships, sintering, permeability, liquidus surface

ABSTRACT

Sintering processes remains today an important part of iron making flowsheets in various industrial plants. Their generic role is to properly treat iron ore along with various fluxes and create homogeneous self-fluxing sinters that have specific physicochemical properties suitable for subsequent treatment in the blast furnace. Two important properties of these sinters are permeability and reductibility. Not only the sinter needs to have optimal permeability and reductibility but also it has to keep these characteristics for a certain time in the upper part of the blast furnace where solid state reactions are essential. One of the causes that would seriously decrease the permeability and reductibility and would create several subsequent problems is an early melt down of the sinter in the blast furnace. In this regard the behavior of iron ore during sintering and the use of optimal fluxing recipes need to be controlled based on phase relationships developed during sintering processes. However the important factors that influence sinter characteristics, such as its chemistry and the fluxing effects during sintering and sinter reduction conditions have not yet clarified and confusion exist in the literature. In today's new reality where many new minor components such as Al2O3 and MgO enter the sinter through raw materials, the quantification of the fluxing effects during sintering processes becomes even more important. In this work, the liquidus surface and phase relations of the sinter primary melts in the CaO-FeO-Fe2O3-SiO2 system at sintering conditions have been quantified through a new physical model and a new type of industrial diagrams in the form of Fe vs. CaO/SiO2. The fluxing effect of the oxygen potential, Al2O3 and MgO has also been quantified and several conclusions have been drawn that can directly help the optimization of the sintering processes.

Cite this article as:
Ian McBow, S. Llubani, Florian Kongoli (2006). Iron Ores Behavior and Phase Relationships During Sintering Processes. The 4th International Congress on the Science and Technology of Ironmaking 2006 , Osaka, Japan.

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