In a process for the gas reduction of particulate oxide-containing ores, in particular
iron-oxide-containing material, in the fluidized-bed process at a pressure of 5
bars, wherein the ore by aid of a reducing gas produced from coal is heated, optionally
also pre-reduced, in a fluidized-bed reactor (1) designed as a pre-heating
stage (5), subsequently is reduced to sponge iron in at least one fluidized-bed
reactor (2, 3) designed as a reduction stage (7, 8), the reducing
gas via a reducing-gas feed duct (12) or reducing-gas duct (13) being
conducted from the reduction stage (7, 8) to the pre-heating stage (5)
in the opposite direction of the material to be reduced and conducted from stage
to stage, and being drawn off as an export gas after purification, heat is supplied
to the reducing gas fed to the reduction stage (7, 8) and/or pre-heating
stage (5), namely by combustion, together with oxygen and/or air, of a portion
of the reducing gas provided for the gas reduction in the reduction stage (7,
8) and/or the pre-heating stage (5).