METHOD OF PRODUCING PELLETS Russian patent published in 1998 - IPC

FIELD: ferrous metallurgy. SUBSTANCE: invention aims at increasing strength of pellets produced from iron-ore concentrates and fired at 1150-1375 C. Method consists in fabricating crude pellets in tray or drum pelletizing apparatuses from a charge composed of titanium- magnetite concentrate, binding or alloying additives; drying pellets; oxidizing them to 85-90%; firing with partial dissociation of hematite at 1150-1375 C; and cooling. Content of calcium, silicon, magnesium, and titanium oxides in finished product is controlled from CaO/SiO₂ ratio in dependence on content of TiO₂ and MgO using following equation: Cao/SiO₂=(1.2-1.3)-(0.20- 0.25)(MgO+TiO₂-1.0) where (1.2-1.3) is CaO/SiO₂ ratio when summary MgO and TiO₂ content is equal to 1 wt %. EFFECT: improved strength of product.