Abstract
Abstract The feasibility of the processing of ilmenite (FeTiO 3 ) by selective reduction of iron oxides in solar reactors is demonstrated. The Australian ilmenite sand is treated in the solid state (900–1000°C) using a fluidized bed reactor. A reaction rate of 0·70 is reached with CH 4 at 900°C. Microscopic examination of the reduced particles indicate a segregation of metallic iron and titanium oxide. In the liquid state ( T > 1400°C) the kinetics of synthetic ilmenite reduction by hydrogen are studied in an aerodynamic levitation device connected with a solar furnace. The experimental graphs of reduction rate X ( t ) indicate two reduction steps: a rapid conversion during the first minute followed by a slower conversion rate. In addition, after a complete reduction we can notice the formation of iron nodule and TiO 2 , rich phase (more than 80% TiO 2 ). This segregation makes the separation of the products very easy to perform.
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