Patent ID: 8709128
Filing Date: 2014-04-29
Classification: B01D,C21B,Y02P

Abstract:
1. A process for the direct reduction of iron ore, the processing comprising the steps of: a) extracting an off gas from a gravitational furnace for recycling; b) cleaning the off gas from particles and dust in a cleaning system; c) obtaining a de-watered off gas by shifting the carbon oxide (CO) and steam (H d) processing the de-watered off gas in a compressor or pumping means, e) removing the CO f) removing nitrogen (N g) dividing the second syngas into a first flow path and a second flow path; h) mixing the second syngas in the first flow path with natural gas supplied by an external source to form a first gas mix stream; i) heating the second syngas in the second flow path from step g) by exchange of sensible heat gained from the de-watering process of step c) to form a heated syngas; j) heating the first gas mix stream by exchange of sensible heat from the reduced metal product cooling zone; k) extracting the first gas mix stream from a reduced metal product cooling zone in the furnace to form a second gas mix stream supplied to a gas generator; l) heating the second gas mix stream from step k) by injecting oxygen (O m) processing the oxygen O n) mixing the heated syngas in step i) with the first reducing gas mixture in step m) to form a second reducing gas mixture; o) feeding the second reducing gas mixture formed in step n) to the reduction zone of the furnace.