Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1989-10-25
1990-12-18
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75446, C21B 1100
Patent
active
049783874
ABSTRACT:
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.
REFERENCES:
patent: 4543123 (1985-09-01), Vuletic
patent: 4673432 (1987-06-01), Hauk
"Kawasaki Steel Gives Details of its New Ironmaking Process", The Tex Report, vol. 19, No. 4,418, Apr. 15, 1987, pp. 5-9.
Andrews Melvyn J.
Deutsche Voest-Alpine Industrienalagenbau GmbH
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