Patent ID: 9428818
Filing Date: 2016-08-30
CPC Classification: C21B,Y02P

Claim Text:
1. A method for reducing material containing iron oxide, comprising: providing material containing iron oxide for forming a solid bed in a reduction shaft; converting the material containing iron oxide to pre-reduced material in the reduction shaft by introducing at least one pre-reduction gas into the solid bed at a pressure p1; also introducing at least a part of the pre-reduced material from the reduction shaft into a melter gasifier and there finally reducing the pre-reduced material by a reduction gas under a pressure p2 formed in the melter gasifier; diverting a top gas having a pressure p3 out of a chamber above the solid bed in the reduction shaft, the diversion being out of the reduction shaft; diverting dust exhaust gas having a pressure p4 from the solid bed and out of the reduction shaft; wherein there are at the reduction shaft relationships p1>p4 and p1>p3; and guiding at least part of the dust exhaust gas jointly with the pre-reduced material at least along a part of a path traveled by the pre-reduced material on introduction thereof into the melter gasifier from the reduction shaft to the melter gasifier.