C - Chemistry – Metallurgy – 21 – B
Patent
C - Chemistry, Metallurgy
21
B
53/29, 39/47
C21B 11/00 (2006.01) C21B 13/00 (2006.01)
Patent
CA 1338125
To produce molten pig iron by melt-reduction of iron ores of various grain sizes containing a fraction A including grain sizes to which diameters of less than 0.2 mm correspond, by pre-reducing the ore by reducing gas, completely reducing the pre-reduced material and smelting it to molten pig iron in a melter gasifier, the pre-reduced ore fraction A is separated from a fraction B including larger grain-size particles by classification by means of reducing- gas and the two fractions A and B are completely reduced separately and fed to the melting zone of the melter gasifier. A plant for carrying out the process according to the invention consists of a melter gasifier and a reduction cyclone, a reduction reactor being optionally arranged in the reducing gas duct between melter gasifier and reduction cyclone, which reduction reactor includes a fluidized bed formed by the reducing gas and, if desired, also a fixed bed and, on its delivery side, is connected with the melter gasifier via at least one transporting device for reduced iron ore.
614187
Deutsche Voest-Alpine Industrieanlagenbau G.m.b.h.
Fetherstonhaugh & Co.
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