METHOD OF SINTERING HIGHLY BASIC SINTER Russian patent published in 2001 - IPC

FIELD: metallurgy, particularly, processes of preparation of raw materials for blast-furnace practice. SUBSTANCE: method includes successive supply to moving sintering cars of two layers of sinter fluxed burden of different thickness with different content in each layer of solid fuel and moisture; subsequent ignition of burden and creation of rarefaction under sintering cars. In the course of sintering, speed of movement of sintering cars is set by relationship: V= K x Qfl.x Tu.l. x Wl.l x P/Qi.o.c. x Tl.l. x Wu. l. , where V is speed of sintering cars movement, m/min; Qfl. is flux consumption, kg/t of sinter burden; Qi. o.c. is consumption of iron ore component, kg/t of sinter burden; Tu.l., Tl.l. are values of solid fuel consumption in upper and lower layers of burden, respectively, kg/t of sinter burden; Wu. l. , Wl.l. are values of moisture content in upper and lower burden layers, respectively, %; P is rarefaction under sintering cars, mm H₂O; K is empirical coefficient characterizing rate of burden sintering in both layers and equalling 0.0042-0.0065 m/min (mm H₂O). In this case, relation Qfl. /Qi. o. c. is set within of 0.46-0.56. Iron ore component of burden is used in the form of slime, mixture of iron ore concentrates, sinter siftings and mill scale. Consumption of every component is set within (0.04-0.14), (0.65-0.8), (0.13-0.15) and (0.02-0.07), respectively, from total consumption of iron ore component of burden. The proposed method provides conditions for production of sinter with high basicity of 3.0-4.0. EFFECT: higher efficiency. 1 tbl, 1 ex