PCT No. PCT/FR97/00175 Sec. 371 Date Jul. 29, 1998 Sec. 102(e) Date Jul. 29, 1998 PCT Filed Jan. 29, 1997 PCT Pub. No. WO97/28284 PCT Pub. Date Aug. 7, 1997A method wherein air is separated in an air separation unit (9), the oxygen thus generated is consumed during at least one step (2, 12, 13) of the steel-making process, the resulting gas is at least partially decarbonated, and the at least partially decarbonated gas is used (at 13) in a reduction reaction of the steel-making process. The partial decarbonation step cyclically includes a CO2 fixation step using a fixation agent, and a regeneration step in which the agent is regenerated in a reactor. Nitrogen generated by the air separation unit (9) is fed into the reactor during the fixation agent regeneration step. The method is useful in combined coal gassification/direct iron ore reduction processes.
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