C - Chemistry – Metallurgy – 10 – J
Patent
C - Chemistry, Metallurgy
10
J
48/26
C10J 3/00 (2006.01) C21B 13/00 (2006.01)
Patent
CA 1081464
METHOD FOR GENERATING GASES FOR THE REDUCTION OF OXIDE ORES, PARTICULARLY IRON ORES ABSTRACT OF THE DISCLOSURE In the method, the reduction gases are used in excess relative to the ores to be reduced, a part of the waste gas from the reduction process is re-introduced into the process after cooling thereof, liberation of dust therefrom, and scrubbing of C02 therefrom, another part of the waste gas is discharged and its heat of combustion utilized in the reduction process, and an amount of fresh gas, containing C0 and H2, cor- responding to the amount of spent and discharged waste gas is introduced into the gas circulationcircuit. The fresh gas is produced by partial oxidation, of hydrocarbons of all types, with oxygen and steamand/or carbon dioxide,and carbon black, C0 and sulfur compounds are washed out, and steam is condensed, before the fresh gas is added to the gas circulation circuit. The mixture of fresh gas and circulating gas is heated to from 800-1000°C by the heat of combustion of the discharged part of the waste gas. As an alternative, the fresh gas is produced by partial oxidation of sulfur-free methane, methane-containing gases, or natural gas and is introduced, without cooling, to the gas circulation circuit. Only the recycled gas, after cooling, dust removal and C02 scrubbing, is heated, prior to mixing with the fresh gas, to from 350-550°C, by the heat of combustion of the discharge part of the waste gas. -1-
255108
Firma Carl Still
Na
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