C - Chemistry – Metallurgy – 21 – B
Patent
C - Chemistry, Metallurgy
21
B
53/32, 39/62
C21B 13/02 (2006.01) C21B 13/00 (2006.01)
Patent
CA 1054800
ABSTRACT OF THE DISCLOSURE The stack gas from a shaft furnace in which iron ore is directly reduced is cooled in a venturi scrubber and then in the presence of steam is treated in a converter so as to transform its carbon monoxide into carbon dioxide and water. The carbon dioxide and water are then scrubbed out of the stack gas in an- other scrubber so as to leave virtually pure hydrogen which is brought in a heater to a temperature between 400°C and 600°C and added to the output of an oxygen reactor that transforms coal or heavy oil and oxygen into a synthetic gas having a carbon-monox- ide/hydrogen volume ratio of at least 1.5:1. The addition of this hydrogen to the output of the reactor lowers the CO/H2 vol- ume ratio to 1:1 at most so that this mixture is reintroduced into the shaft furnace at a temperature of around 1000°C as a reducing gas. Since, by this system, the reduction has is brought, after separation of water and particulates to a temperature of say 1000°C prior to introduction into the furnace, the danger of soot formation is eliminated.
233262
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