METHOD OF PELLETIZING Russian patent published in 2013 - IPC C22B1/242 

FIELD: metallurgy.

SUBSTANCE: iron-ore concentrate and binder are mixed to obtain damp blend and wall accretion at pelletiser bottom. Note that damp blend is fed into pelletiser in two flows with feeding first flow into compressed gas flow in d_ca-dia jet device case to produce gas-damp blend mix. Zone occupied by said blend and that without it are formed at pelletiser bottom. Nucleation is performed by depositing the blend on wall accretion with the help of gas-damp blend mix jet in zone with no blend to produce dense layer of damp blend. Said dense layer of blend is divided into nuclei by plate separators, wall accretion is cleaned of nuclei to form pellet shell by extra pelletizing said nuclei by second flow blend. Note here that superheated steam in fed into compressed gas flow in amount of 2-10 m³/t of blend to be increased by 2-3 at increase of superheated steam flow rate per every 2 m³/t of blend L/d_ca.

EFFECT: higher strength of pellets, efficiency of pelletiser, reduced consumption of compressed air.

1 dwg, 1 tbl, 1 ex