Studies on pelletization, induration and reduction of mill scale

An account of studies carried our on pelletization, drying, firing and hydr ogen reduction of mill scale generated at Egyptian Iron and Steel Co. is pr esented. The mill scale contained a high proportion of wustite. magnetite, and metallic iron was pelletized in a disc pelletizer. using water as a hin der material. The studies on pelletization was conducted by varying disc sl ope/angle (45-70 degrees). residence time (5-12 min.), speed of pelletizer (13-17 rpm). feed size (-50 to 270 mesh) and amount of binder (6-11%) with an aim to prepare pellets with optimum properties. Green pellets were subje cted to physical studies on drying (100-400 degrees C) and firing (500-1300 degrees C) for different periods of time prior to hydrogen reduction at 10 00 degrees C. Ar each stage pellets were evaluated with respect to their co mpressive strength and average drop number. The changes in the properties a t different stages of processing are explained with the support of chemical analysis and microstructure.