Patent ID: 9139884
Filing Date: 2015-09-22
Classification: C21B,F27D,Y02P

Abstract:
1. A process for producing liquid pig iron or liquid primary steel products from charge materials formed by iron ores and additions, the process comprising: subjecting the charge materials to a reduction in a reducing zone and then feeding the charge materials to a smelting unit for smelting along with adding carbon carriers and oxygen-containing gas to form a fixed bed and for forming a CO- and H introducing the reduction gas into the reducing zone to form a converted reduction gas, then drawing the converted reduction gas off from the reducing zone as hot top gas; subjecting the hot top gas, laden with solid matter, to at least a dry dust separation, for at least partially separating the solid matter from the top gas, and returning at least parts of the separated solid matter into the smelting unit or into the reducing zone, after the dry dust separation, subjecting the top gas at least to an additional fine separation stage for at least partially separating the solid matter remaining in the top gas, and returning the separated solid matter, separated in the fine separation stage, into the smelting unit, the additional fine separation stage being performed by at least two devices, at least two of the at least two devices being connected in parallel to each other, the at least two devices performing the additional fine separation stage further comprising an additional separation device that can be turned on or off.