METHOD FOR PRODUCING PELLETS Russian patent published in 2023 - IPC C22B1/24 

FIELD: ferrous metallurgy.

SUBSTANCE: invention relates to the field of ferrous metallurgy, namely the production of iron ore pellets. The wet charge is fed into the pelletizer in two streams and a scull is formed on the bottom of the pelletizer. The first batch flow is introduced into the compressed gas flow to form a gas-moisture batch jet. Pore-forming additives are fed into the gas-moisture charge jet, which are crushed particles of plant origin and scale of steel wire production. Macrodefects are formed on the surface of particles of plant origin by pre-mixing them with iron-containing scale of steel wire production. A mixture is formed, which is fed into the gas-moisture charge jet. On the bottom of the pelletizer, a zone occupied by the charge and a zone free from the charge are formed. The charge is sprayed onto the skull in a charge-free zone to obtain a dense layer of wet charge. Divide the said layer of the wet mixture into germs, carry out additional pelletization of the germs with the mixture of the second flow to the pellets. The pellets are dried and fired. Before heating the iron-containing scale of steel wire production, its particles are crushed to a size of 0.05-1.0 mm, and after mixing the particles of plant origin with the scale, the mixture is sprayed with a finely sprayed stream of water at a flow rate of 100-250 g/kg of pore-forming additives.

EFFECT: increased strength of calcined pellets and increased productivity of the pelletizer.

1 cl, 1 dwg, 1 tbl