C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
53/27, 53/349, 3
C21C 5/52 (2006.01) C21B 5/00 (2006.01) C21B 13/02 (2006.01) C21B 13/06 (2006.01) C21B 13/12 (2006.01) F27B 1/02 (2006.01)
Patent
CA 1043574
ABSTRACT This invention relates to a method for producing metal from an oxidic material characterized in that final reduction and melting of a pre-reduced oxidic material takes place in the presence of a solid reduction agent in lump form, that the reducing gas leaving the final reduction stage is used for pre-reducing the incoming oxidic material without the presence of solid reduction agent, that extra energy is supplied to the final reduction and melting stage by means of a gaseous energy carrier and that the gas leaving the pre-reduction stage is used as fuel for pre-heating incoming oxidic material. This invention also relates to a device for carrying out the method characterized in that it comprises at least two interconnected shaft furnaces to be used for pre-heating and pre-reduction respectively final reduction and melting. The energy consumption using this invention is lower than the energy consumption obtained in prior art processes.
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