PRODUCTION OF IRON ORE PELLETS Russian patent published in 2015 - IPC C22B1/243 

FIELD: metallurgy.

SUBSTANCE: claimed process comprises preparation of charge for green pellets, pelletising of charge to get green pellets, drying, annealing and cooling of pellets. On said preparation of charge, iron-bearing material is mixed with undersized coke and slaked lime. Said iron-bearing material represents slag and/or dust of gas cleaners of blast-furnace, open-hearth, converter or electric furnace steel making processes, or mixed thereof. Amount of undersized coke is 1.2-1.4 times larger than total amount of iron and zinc in iron-bearing material. Amount of slaked lime makes 0.14-0.20 of total amount of undersized coke and iron-bearing material. Obtained charge is directed to trough-like pelletiser for wetting to moisture content of 12-16 wt %. Produced pellets are dried in belt-type drier at 150-250°C for 1-3 hours. Then dry pellets are screened at two-sieve screen. Note here that specification pellets are transferred to drum-type counter flow furnace to anneal the pellets at 950-1050°C for 2-3 hours.

EFFECT: higher efficiency of recovery of metallurgical wastes.

4 cl, 2 dwg, 1 tbl