C - Chemistry – Metallurgy – 21 – B
Patent
C - Chemistry, Metallurgy
21
B
53/32
C21B 5/06 (2006.01) C21B 13/02 (2006.01)
Patent
CA 1242077
ABSTRACT OF THE DISCLOSURE: There is disclosed a process for the direct reduction of iron-oxide-containing materials by a gasification gas pro- duced in a gasifier by reacting carbon with oxygen and, if desired, with steam, upon the addition of sulfur acceptors in a fluidized bed. The gasification gas is supplied to a direct reduction shaft furnace after separation of solid particles carried therewith. At least part of the top gas withdrawn from the direct reduction shaft furnace is com- pressed after dust scrubbing and is recycled to the gasi- fier. The sulfur acceptors are supplied as fine particles separated from the coal in cocurrent with, and/or counter- flow to, the fluidized-bed forming gases. The top gas from the reduction shaft furnace, which has a concentration of from 15 to 30 % CO2 and a temperature of from 80 to 800°C, is recycled laterally through the wall of the gasifier into the region of the fluidized bed, which is maintained at a temperature of at least 1,150°C. The slag, which is in the molten state with the temperature prevailing in the gasi- fier, containing ashes and sulfur compounds and collecting under the formation of a bath, is removed via a tap in the vicinity of the bottom of the gasifier. The solid particles separated from the gasification gas are mixed with dust coal having a grain size of up to 3 mm and are recycled into the bottom region of the gasifier above the surface of the slag bath.
488449
Milionis Konstantin
Pusch Hermann
Schneider Hermann
Fetherstonhaugh & Co.
Voest - Alpine Aktiengesellschaft
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