Importance

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Abstract

Green pellets are sintered by drying, pre-heating, firing and cooling steps, at least the drying and pre-heating steps being carried out with said pellets resting, in the form of a bed, on an endless gas-permeable conveyor and at least the first part of the drying operation being carried out with a gas which passes upwardly through said conveyor and the pellet bed, while subsequent temperature-increasing treatment steps carried out on the conveyor are effected with a hot gas flowing downwardly through the pellet bed and the conveyor. At least the first part of the drying operation is effected with heat stored in the conveyor and/or in a hearth layer for the pellet bed arranged on said conveyor by using a drying gas which comprises substantially cool air and which is heated during its passage through the conveyor and/or the hearth layer by the heat stored therein.

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First Claim