Apparatus for the reduction of iron ores in a circulating fluidized bed

• Main Authors: DELEBARRE, ARNAUD, DE LASSAT DE PRESSIGNY, YANN
• Format: Patent
• Language: English; French; German
• Published: 23.09.1998
• Edition: 6
• Subjects: CHEMISTRY; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON

Plant for reducing iron ore, of the type comprising: - a prereduction reactor (1) containing a bed of iron ore particles in the course of reduction and of semicoke, provided with means for fluidising and circulating the said ore and the said semicoke, and comprising means for injecting a reducing gas containing CO and hydrogen into the said prereduction reactor (1); - means for gas-particle separation (6) connected to the said prereduction reaction by a conduit (30), ensuring the separation between the reducing gases containing CO and hydrogen originating from the said prereduction reactor (1) and the particles which they have entrained, and the removal of the said reducing gases; - means (11, 13) for mixing new ore with the said particles; - a gasifier (12) collecting the said particles in the form of a fluidised bed, provided with means for producing CO and hydrogen from hydrocarbon matter and oxygen, and means for conveying the said particles into the said gasification reactor (1); - means (28, 29) for extracting ore in the course of reduction and semicoke from the said prereduction reactor (1); plant characterised in that it also includes a conduit for bringing the gases which have circulated in the gasifier (12) in the said conduit (30) connecting the prereduction reactor (1) to the means for separation (6).