Process and plant for reducing solids containing iron oxide

C - Chemistry – Metallurgy – 21 – B

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C21B 13/00 (2006.01)

Patent

CA 2534863

This invention relates to a process for reducing solids containing iron oxide, such as iron ore, in which fine-grained solids are heated and at least partly calcined in a pre heating stage (2, 9). In a first fluidized-bed reactor (14) downstream of the preheating stage (2, 9), the solids are prereduced and reduced further in a second fluidized-bed reactor (16). Downstream of the second reactor (16) a briquetting stage (20) is pro vided, in which the solids are briquetted at a temperature above 500~C To increase the energy efficiency of the process and improve the flowability of the solids in the briquetting stage (20), magnesite is added to the preheating stage (2, 9) together with the solids containing iron oxide, which magnesite is at least partly calcined in the preheating stage (2, 9) to obtain magnesium oxide. Furthermore, the invention relates to a corresponding plant.

L'invention concerne un procédé pour la réduction de matières solides contenant de l'oxyde de fer, du type minerai de fer. Des matières solides à grain fin sont chauffées et au moins partiellement calcinées dans un étage de préchauffage (2, 9). Dans un premier réacteur à lit fluidisé (14) en aval de l'étage de préchauffage (2, 9), les matières sont préréduites et encore réduites ensuite dans un second réacteur à lit fluidisé (16). En aval du second réacteur (16) se trouve un étage de briquetage (20) des matières solides à une température supérieure à 500 ·C. Pour optimiser l'énergie du processus et améliorer l'aptitude à l'écoulement des matières dans l'étage de briquetage (20), on ajoute de la magnésite à l'étage de préchauffage (2, 9) avec les matières contenant de l'oxyde de fer, et cette magnésite est au moins partiellement calcinée dans l'étage de préchauffage (2, 9), donnant de l'oxyde de magnésium. L'invention concerne en outre une installation correspondante.

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