METHOD OF THERMAL TREATMENT OF PELLETS Russian patent published in 2014 - IPC C22B1/24 

FIELD: metallurgy.

SUBSTANCE: method includes laying a layer of moist pellets onto a conveyor belt of a trough-shaped section, profiling a layer of pellets according to the cross section shape in the conveyor belt, resting with side surfaces at inclined roller supports and a central part resting onto horizontal roller supports and arranged in a heat insulation hearth with realisation of partial drying by heated air supplied by a fan via a blowing box. Then pellets are sent to a fire grate of an annealing machine for final thermal treatment. At the same time the blowing box is divided at least into three sections, air temperature in the first section is maintained up to 300°C, and in subsequent sections the air temperature is increased by 0.5-1.5°C per each metre of the conveyor belt length. In the central part of the conveyor belt resting against horizontal roller supports, they perform longitudinal holes with length of more than two diameters of pellets and width, not exceeding half of diameter of the pellets arranged in staggered order along the above conveyor belt, and the conveyor belt is heated.

EFFECT: invention makes it possible to reduce fuel consumption for thermal treatment of pellets.

3 dwg, 1 tbl, 1 ex