PELLET OBTAINING METHOD Russian patent published in 2014 - IPC C22B1/24 

FIELD: metallurgy.

SUBSTANCE: concentrate and binding agent are mixed so that wet charge is obtained, and slag lining is formed at pelletiser bottom. Wet charge is supplied to the pelletiser in two flows; the first one of them is added to compressed gas flow so that a gas-moisture-charge jet is formed. At the pelletiser bottom there formed is a zone occupied with charge and a zone free from charge. Nucleation is performed by charge sputtering onto slag lining by the jet in the zone free from charge so that a dense layer of wet charge is obtained. The above dense charge layer is separated into nuclei by means of a rotary drum equipped with ribs and cover of pellets is formed by additional pelletisation of nuclei by charge of the second flow till pellets are obtained. With that, ribs of the drum are wavy and have the wave length that does not exceed double limit size of pellets. Height of ribs is at least height of the dense layer of wet charge; with that, adjacent ribs are offset relative to each other by the half wave length. During separation of the wet charge dense layer the drum ribs are uniformly wetted on both sides.

EFFECT: invention allows increasing strength of pellets and improving pelletiser efficiency.

1 dwg, 1 tbl, 1 ex