METHOD FOR CONTINUOUSLY MANUFACTURING FIRED PELLETS

摘要

Fired pellets are continuously mfd. by (i) using raw materials comprising 30-70 wt.% first iron ore fines (50-80 wt.% up to 0.044 mm. and 50-20 wt.% of 0.044-0.5 mm. particle size) and 70-30 wt.% second iron ore fines (40-70 wt.% 0.5-Smm. and 60-30 wt.% to 0.5 mm. particle size); (ii) adding flux powder selected from quicklime, slaked lime, limestone and dolomite; (ii) adding water and pelletising to green pellets of 3-12 mm. size; (iv) covering the pellet surface with 2.5-4.0 wt.% solid fuel powder; (v) feeding the pellets to an endless travelling grate type firing furnace to form a 300-1500 mm. thick layer; (vi) drying the pellets in a drying zone of the furnace (vii) igniting the solid fuel powder in an ignition zone of the furnace; and (viii) firing the pellets in a furnace firing zone.