PELLET HEAT TREATMENT METHOD Russian patent published in 2017 - IPC C22B1/24 

FIELD: metallurgy.

SUBSTANCE: damp pellets are stacked in a layer in the shape of an isosceles trapezoid on the conveyor belt disposed in heat-insulated hearth for partial drying by heated air supplied through the blow box is divided at least into 3 but not more than 10 sections, each of which is provided with a nozzle surface. The air temperature is maintained within the first section 300°C, and in the subsequent sections it is increased by 0.5-1.5°C per metre of the conveyor belt. In this case, the air duct sections are mounted movably in the vertical direction. In the first section, the distance between the nozzle surface and the pellets layer is selected to be 11 gauges, and in the subsequent sections this distance is reduced by 0.1-0.2 gauges per metre of the conveyor belt. The heated air flow is screened by sliding dampers of elastic material attached to the longitudinal edges of sections. Then, pellets are laid on the lattice grate of roasting machine and finally processed.

EFFECT: invention improves the dehumidification efficiency along the cross section of a pellets layer.

2 cl, 2 dwg, 1 tbl, 1 ex