Patent ID: 7473393
Filing Date: 2009-01-06
Classification: C21B,F27B,F27D,Y02P

Abstract:
1. A method for discharging a reduced product produced on a movable hearth of a movable-hearth furnace, comprising: removing the reduced product from the movable hearth by scooping the reduced product and the solid reductant with a screen; separating the reduced product from a solid reductant by removing the reduced product having a larger grain size from the solid reductant layer and discharging the reduced product with a screw feeder having an axis of rotation which substantially spans the movable hearth in the widthwise direction of the movable hearth and extends outwardly of the movable-hearth furnace, and which operates in such a maimer that a part of the solid reductant is left on the solid reductant layer by controlling the position of the axis of the screw feeder with respect to the movable hearth; either leaving substances other than the reduced product on the solid reductant layer or returning the substances onto the solid reductant layer; and discharging the reduced product to the outside of the movable-hearth furnace.