Direct reduction of iron oxide using coal gasification gas

摘要

Direct reduction of Fe oxide using a coal gasification gas formed in a fluid bed by reaction of coal, O2 and opt. steam, and S acceptors includes: supplying the S acceptors as fine particles separate from the coal in a co- or counter-current flow with the fluidising gases; recycling gas from the reduction process having a CO2 content of 15-30% and temp. 80-800 deg.C laterally through the gasifier wall into an area of the fluidised bed held at at least 1150 deg.C; tapping slag from the bottom of the gasifier; and mixing dust sepd. from the gasification gas with coal dust up to 3mm size and recycling the mixt. to the bottom of the gasifier above the slag surface.