VERFAHREN ZUR DIREKTREDUKTION VON FEINERZ SOWIE ANLAGE ZUR DURCHFÜHRUNG DES VERFAHRENS

摘要

The invention relates to a method for directly reducing, by way of a fluidized bed method, ore fine that comprises at least one ore component from the group of the magnetite, hydrated, carbonate or sulfide ores. The ore fine is heated in a heating fluidized bed zone which is operated with a heating medium, and said heating medium is combusted. The ore is then transferred to at least one reducing fluidized bed zone in which the synthesis gas is fed as the reducing gas to the ore fine in a counter-current and is removed as a top gas, the ore fine being reduced in said zone to sponge iron. In the heating fluidized bed zone the ore fine is specifically heated up by combustion of the heating medium while oxygen or an oxygen-containing gas is additionally fed to adjust oxidizing conditions, and the hydrate, carbonate and/or sulfide groups are removed and/or converted to hematite. At least a part of the top gas is used as a recycled reducing gas for the direct reduction in the reducing fluidized bed zone.